[PATCH net-next v3 00/11] devlink: retain error in struct devlink_fmsg

[PATCH net-next v3 00/11] devlink: retain error in struct devlink_fmsg

[Przemek Kitszel]

Extend devlink fmsg to retain error (patch 1),
so drivers could omit error checks after devlink_fmsg_*() (patches 2-10),
and finally enforce future uses to follow this practice by change to
return void (patch 11)

Note that it was compile tested only.

bloat-o-meter for whole series:
add/remove: 8/18 grow/shrink: 23/40 up/down: 2017/-5833 (-3816)

changelog:
v3: set err to correct value, thanks to Simon and smatch
    (mlx5 patch, final patch);
v2: extend series by two more drivers (qed, qlge);
    add final cleanup patch, since now whole series should be merged in
    one part (thanks Jiri for encouragement here);

v1:
https://lore.kernel.org/netdev/20231010104318.3571791-3-przemyslaw.kitszel@intel.com
v2:
https://lore.kernel.org/netdev/20231017105341.415466-1-przemyslaw.kitszel@intel.com



Przemek Kitszel (11):
  devlink: retain error in struct devlink_fmsg
  netdevsim: devlink health: use retained error fmsg API
  pds_core: devlink health: use retained error fmsg API
  bnxt_en: devlink health: use retained error fmsg API
  hinic: devlink health: use retained error fmsg API
  octeontx2-af: devlink health: use retained error fmsg API
  mlxsw: core: devlink health: use retained error fmsg API
  net/mlx5: devlink health: use retained error fmsg API
  qed: devlink health: use retained error fmsg API
  staging: qlge: devlink health: use retained error fmsg API
  devlink: convert most of devlink_fmsg_*() to return void

 drivers/net/ethernet/amd/pds_core/devlink.c   |  29 +-
 .../net/ethernet/broadcom/bnxt/bnxt_devlink.c |  93 ++--
 .../net/ethernet/huawei/hinic/hinic_devlink.c | 217 +++-----
 .../marvell/octeontx2/af/rvu_devlink.c        | 464 +++++-------------
 .../mellanox/mlx5/core/diag/fw_tracer.c       |  49 +-
 .../mellanox/mlx5/core/diag/reporter_vnic.c   | 118 ++---
 .../mellanox/mlx5/core/diag/reporter_vnic.h   |   6 +-
 .../ethernet/mellanox/mlx5/core/en/health.c   | 187 ++-----
 .../ethernet/mellanox/mlx5/core/en/health.h   |  14 +-
 .../mellanox/mlx5/core/en/reporter_rx.c       | 426 ++++------------
 .../mellanox/mlx5/core/en/reporter_tx.c       | 346 ++++---------
 .../net/ethernet/mellanox/mlx5/core/en_rep.c  |   5 +-
 .../net/ethernet/mellanox/mlx5/core/health.c  | 127 ++---
 drivers/net/ethernet/mellanox/mlxsw/core.c    | 171 ++-----
 drivers/net/ethernet/qlogic/qed/qed_devlink.c |   6 +-
 drivers/net/netdevsim/health.c                | 118 ++---
 drivers/staging/qlge/qlge_devlink.c           |  60 +--
 include/net/devlink.h                         |  60 +--
 net/devlink/health.c                          | 387 +++++----------
 19 files changed, 823 insertions(+), 2060 deletions(-)

-- 
2.38.1

[PATCH net-next v3 01/11] devlink: retain error in struct devlink_fmsg

[Przemek Kitszel]

Retain error value in struct devlink_fmsg, to relieve drivers from
checking it after each call.
Note that fmsg is an in-memory builder/buffer of formatted message,
so it's not the case that half baked message was sent somewhere.

We could find following scheme in multiple drivers:
  err = devlink_fmsg_obj_nest_start(fmsg);
  if (err)
  	return err;
  err = devlink_fmsg_string_pair_put(fmsg, "src", src);
  if (err)
  	return err;
  err = devlink_fmsg_something(fmsg, foo, bar);
  if (err)
	return err;
  // and so on...
  err = devlink_fmsg_obj_nest_end(fmsg);

With retaining error API that translates to:
  devlink_fmsg_obj_nest_start(fmsg);
  devlink_fmsg_string_pair_put(fmsg, "src", src);
  devlink_fmsg_something(fmsg, foo, bar);
  // and so on...
  devlink_fmsg_obj_nest_end(fmsg);

What means we check error just when is time to send.

Possible error scenarios are developer error (API misuse) and memory
exhaustion, both cases are good candidates to choose readability
over fastest possible exit.

Note that this patch keeps returning errors, to allow per-driver conversion
to the new API, but those are not needed at this point already.

This commit itself is an illustration of benefits for the dev-user,
more of it will be in separate commits of the series.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 2/4 grow/shrink: 17/3 up/down: 462/-466 (-4)
---
 net/devlink/health.c | 247 +++++++++++++------------------------------
 1 file changed, 76 insertions(+), 171 deletions(-)

diff --git a/net/devlink/health.c b/net/devlink/health.c
index 51e6e81e31bb..3858a436598e 100644
--- a/net/devlink/health.c
+++ b/net/devlink/health.c
@@ -19,6 +19,7 @@ struct devlink_fmsg_item {
 
 struct devlink_fmsg {
 	struct list_head item_list;
+	int err; /* first error encountered on some devlink_fmsg_XXX() call */
 	bool putting_binary; /* This flag forces enclosing of binary data
 			      * in an array brackets. It forces using
 			      * of designated API:
@@ -562,10 +563,8 @@ static int devlink_health_do_dump(struct devlink_health_reporter *reporter,
 		return 0;
 
 	reporter->dump_fmsg = devlink_fmsg_alloc();
-	if (!reporter->dump_fmsg) {
-		err = -ENOMEM;
-		return err;
-	}
+	if (!reporter->dump_fmsg)
+		return -ENOMEM;
 
 	err = devlink_fmsg_obj_nest_start(reporter->dump_fmsg);
 	if (err)
@@ -670,43 +669,46 @@ int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb,
 	return devlink_health_reporter_recover(reporter, NULL, info->extack);
 }
 
-static int devlink_fmsg_nest_common(struct devlink_fmsg *fmsg,
-				    int attrtype)
+static void devlink_fmsg_err_if_binary(struct devlink_fmsg *fmsg)
+{
+	if (!fmsg->err && fmsg->putting_binary)
+		fmsg->err = -EINVAL;
+}
+
+static int devlink_fmsg_nest_common(struct devlink_fmsg *fmsg, int attrtype)
 {
 	struct devlink_fmsg_item *item;
 
+	if (fmsg->err)
+		return fmsg->err;
+
 	item = kzalloc(sizeof(*item), GFP_KERNEL);
-	if (!item)
-		return -ENOMEM;
+	if (!item) {
+		fmsg->err = -ENOMEM;
+		return fmsg->err;
+	}
 
 	item->attrtype = attrtype;
 	list_add_tail(&item->list, &fmsg->item_list);
 
 	return 0;
 }
 
 int devlink_fmsg_obj_nest_start(struct devlink_fmsg *fmsg)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
+	devlink_fmsg_err_if_binary(fmsg);
 	return devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_OBJ_NEST_START);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_obj_nest_start);
 
 static int devlink_fmsg_nest_end(struct devlink_fmsg *fmsg)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
+	devlink_fmsg_err_if_binary(fmsg);
 	return devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_NEST_END);
 }
 
 int devlink_fmsg_obj_nest_end(struct devlink_fmsg *fmsg)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
 	return devlink_fmsg_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_obj_nest_end);
@@ -717,15 +719,20 @@ static int devlink_fmsg_put_name(struct devlink_fmsg *fmsg, const char *name)
 {
 	struct devlink_fmsg_item *item;
 
-	if (fmsg->putting_binary)
-		return -EINVAL;
+	devlink_fmsg_err_if_binary(fmsg);
+	if (fmsg->err)
+		return fmsg->err;
 
-	if (strlen(name) + 1 > DEVLINK_FMSG_MAX_SIZE)
-		return -EMSGSIZE;
+	if (strlen(name) + 1 > DEVLINK_FMSG_MAX_SIZE) {
+		fmsg->err = -EMSGSIZE;
+		return fmsg->err;
+	}
 
 	item = kzalloc(sizeof(*item) + strlen(name) + 1, GFP_KERNEL);
-	if (!item)
-		return -ENOMEM;
+	if (!item) {
+		fmsg->err = -ENOMEM;
+		return fmsg->err;
+	}
 
 	item->nla_type = NLA_NUL_STRING;
 	item->len = strlen(name) + 1;
@@ -738,68 +745,30 @@ static int devlink_fmsg_put_name(struct devlink_fmsg *fmsg, const char *name)
 
 int devlink_fmsg_pair_nest_start(struct devlink_fmsg *fmsg, const char *name)
 {
-	int err;
-
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
-	err = devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_PAIR_NEST_START);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_put_name(fmsg, name);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_err_if_binary(fmsg);
+	devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_PAIR_NEST_START);
+	return devlink_fmsg_put_name(fmsg, name);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_pair_nest_start);
 
 int devlink_fmsg_pair_nest_end(struct devlink_fmsg *fmsg)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
 	return devlink_fmsg_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_pair_nest_end);
 
 int devlink_fmsg_arr_pair_nest_start(struct devlink_fmsg *fmsg,
 				     const char *name)
 {
-	int err;
-
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_ARR_NEST_START);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_pair_nest_start(fmsg, name);
+	return devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_ARR_NEST_START);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_arr_pair_nest_start);
 
 int devlink_fmsg_arr_pair_nest_end(struct devlink_fmsg *fmsg)
 {
-	int err;
-
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
-	err = devlink_fmsg_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_nest_end(fmsg);
+	return devlink_fmsg_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_arr_pair_nest_end);
 
@@ -813,14 +782,19 @@ int devlink_fmsg_binary_pair_nest_start(struct devlink_fmsg *fmsg,
 		return err;
 
 	fmsg->putting_binary = true;
-	return err;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_binary_pair_nest_start);
 
 int devlink_fmsg_binary_pair_nest_end(struct devlink_fmsg *fmsg)
 {
-	if (!fmsg->putting_binary)
-		return -EINVAL;
+	if (fmsg->err)
+		return fmsg->err;
+
+	if (!fmsg->putting_binary) {
+		fmsg->err = -EINVAL;
+		return fmsg->err;
+	}
 
 	fmsg->putting_binary = false;
 	return devlink_fmsg_arr_pair_nest_end(fmsg);
@@ -833,12 +807,16 @@ static int devlink_fmsg_put_value(struct devlink_fmsg *fmsg,
 {
 	struct devlink_fmsg_item *item;
 
-	if (value_len > DEVLINK_FMSG_MAX_SIZE)
-		return -EMSGSIZE;
+	if (value_len > DEVLINK_FMSG_MAX_SIZE) {
+		fmsg->err = -EMSGSIZE;
+		return fmsg->err;
+	}
 
 	item = kzalloc(sizeof(*item) + value_len, GFP_KERNEL);
-	if (!item)
-		return -ENOMEM;
+	if (!item) {
+		fmsg->err = -ENOMEM;
+		return fmsg->err;
+	}
 
 	item->nla_type = value_nla_type;
 	item->len = value_len;
@@ -851,42 +829,32 @@ static int devlink_fmsg_put_value(struct devlink_fmsg *fmsg,
 
 static int devlink_fmsg_bool_put(struct devlink_fmsg *fmsg, bool value)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
+	devlink_fmsg_err_if_binary(fmsg);
 	return devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_FLAG);
 }
 
 static int devlink_fmsg_u8_put(struct devlink_fmsg *fmsg, u8 value)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
+	devlink_fmsg_err_if_binary(fmsg);
 	return devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U8);
 }
 
 int devlink_fmsg_u32_put(struct devlink_fmsg *fmsg, u32 value)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
+	devlink_fmsg_err_if_binary(fmsg);
 	return devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U32);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_u32_put);
 
 static int devlink_fmsg_u64_put(struct devlink_fmsg *fmsg, u64 value)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
+	devlink_fmsg_err_if_binary(fmsg);
 	return devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U64);
 }
 
 int devlink_fmsg_string_put(struct devlink_fmsg *fmsg, const char *value)
 {
-	if (fmsg->putting_binary)
-		return -EINVAL;
-
+	devlink_fmsg_err_if_binary(fmsg);
 	return devlink_fmsg_put_value(fmsg, value, strlen(value) + 1,
 				      NLA_NUL_STRING);
 }
@@ -905,113 +873,52 @@ EXPORT_SYMBOL_GPL(devlink_fmsg_binary_put);
 int devlink_fmsg_bool_pair_put(struct devlink_fmsg *fmsg, const char *name,
 			       bool value)
 {
-	int err;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_bool_put(fmsg, value);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_pair_nest_start(fmsg, name);
+	devlink_fmsg_bool_put(fmsg, value);
+	return devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_bool_pair_put);
 
 int devlink_fmsg_u8_pair_put(struct devlink_fmsg *fmsg, const char *name,
 			     u8 value)
 {
-	int err;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u8_put(fmsg, value);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_pair_nest_start(fmsg, name);
+	devlink_fmsg_u8_put(fmsg, value);
+	return devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_u8_pair_put);
 
 int devlink_fmsg_u32_pair_put(struct devlink_fmsg *fmsg, const char *name,
 			      u32 value)
 {
-	int err;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_put(fmsg, value);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_pair_nest_start(fmsg, name);
+	devlink_fmsg_u32_put(fmsg, value);
+	return devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_u32_pair_put);
 
 int devlink_fmsg_u64_pair_put(struct devlink_fmsg *fmsg, const char *name,
 			      u64 value)
 {
-	int err;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u64_put(fmsg, value);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_pair_nest_start(fmsg, name);
+	devlink_fmsg_u64_put(fmsg, value);
+	return devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_u64_pair_put);
 
 int devlink_fmsg_string_pair_put(struct devlink_fmsg *fmsg, const char *name,
 				 const char *value)
 {
-	int err;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_string_put(fmsg, value);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_pair_nest_start(fmsg, name);
+	devlink_fmsg_string_put(fmsg, value);
+	return devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_string_pair_put);
 
 int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
 				 const void *value, u32 value_len)
 {
 	u32 data_size;
-	int end_err;
 	u32 offset;
 	int err;
 
@@ -1027,14 +934,12 @@ int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
 		if (err)
 			break;
 		/* Exit from loop with a break (instead of
-		 * return) to make sure putting_binary is turned off in
-		 * devlink_fmsg_binary_pair_nest_end
+		 * return) to make sure putting_binary is turned off
 		 */
 	}
 
-	end_err = devlink_fmsg_binary_pair_nest_end(fmsg);
-	if (end_err)
-		err = end_err;
+	err = devlink_fmsg_binary_pair_nest_end(fmsg);
+	fmsg->putting_binary = false;
 
 	return err;
 }
-- 
2.38.1

Re: [PATCH net-next v3 01/11] devlink: retain error in struct devlink_fmsg

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:37PM +0200, Przemek Kitszel wrote:
> Retain error value in struct devlink_fmsg, to relieve drivers from
> checking it after each call.
> Note that fmsg is an in-memory builder/buffer of formatted message,
> so it's not the case that half baked message was sent somewhere.
> 
> We could find following scheme in multiple drivers:
>   err = devlink_fmsg_obj_nest_start(fmsg);
>   if (err)
>   	return err;
>   err = devlink_fmsg_string_pair_put(fmsg, "src", src);
>   if (err)
>   	return err;
>   err = devlink_fmsg_something(fmsg, foo, bar);
>   if (err)
> 	return err;
>   // and so on...
>   err = devlink_fmsg_obj_nest_end(fmsg);
> 
> With retaining error API that translates to:
>   devlink_fmsg_obj_nest_start(fmsg);
>   devlink_fmsg_string_pair_put(fmsg, "src", src);
>   devlink_fmsg_something(fmsg, foo, bar);
>   // and so on...
>   devlink_fmsg_obj_nest_end(fmsg);
> 
> What means we check error just when is time to send.
> 
> Possible error scenarios are developer error (API misuse) and memory
> exhaustion, both cases are good candidates to choose readability
> over fastest possible exit.
> 
> Note that this patch keeps returning errors, to allow per-driver conversion
> to the new API, but those are not needed at this point already.
> 
> This commit itself is an illustration of benefits for the dev-user,
> more of it will be in separate commits of the series.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

...

> @@ -1027,14 +934,12 @@ int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,

Hi Przemek,

The line before this hunk is:

		err = devlink_fmsg_binary_put(fmsg, value + offset, data_size);

And, as of this patch, the implementation of
devlink_fmsg_binary_pair_nest_start() looks like this:

int devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
                            u16 value_len)
{
        if (!fmsg->putting_binary)
                return -EINVAL;

        return devlink_fmsg_put_value(fmsg, value, value_len, NLA_BINARY);
}

Which may return an error, if the if condition is met, without setting
fmsg->err.

>  		if (err)
>  			break;
>  		/* Exit from loop with a break (instead of
> -		 * return) to make sure putting_binary is turned off in
> -		 * devlink_fmsg_binary_pair_nest_end
> +		 * return) to make sure putting_binary is turned off
>  		 */
>  	}
>  
> -	end_err = devlink_fmsg_binary_pair_nest_end(fmsg);
> -	if (end_err)
> -		err = end_err;

Prior to this patch, the value of err from the loop above was preserved,
unless devlink_fmsg_binary_pair_nest_end generated an error.

> +	err = devlink_fmsg_binary_pair_nest_end(fmsg);

But now it looks like this is only the case if fmsg->err corresponds to err
when the loop was exited.

Or in other words, the err returned by devlink_fmsg_binary_put()
is not propagated to the caller if !fmsg->putting_binary.

If so, is this intentional?

> +	fmsg->putting_binary = false;
>  
>  	return err;
>  }
> -- 
> 2.38.1
> 

Re: [PATCH net-next v3 01/11] devlink: retain error in struct devlink_fmsg

[Przemek Kitszel]

On 10/19/23 15:00, Simon Horman wrote:
> On Wed, Oct 18, 2023 at 10:26:37PM +0200, Przemek Kitszel wrote:
>> Retain error value in struct devlink_fmsg, to relieve drivers from
>> checking it after each call.
>> Note that fmsg is an in-memory builder/buffer of formatted message,
>> so it's not the case that half baked message was sent somewhere.
>>
>> We could find following scheme in multiple drivers:
>>    err = devlink_fmsg_obj_nest_start(fmsg);
>>    if (err)
>>    	return err;
>>    err = devlink_fmsg_string_pair_put(fmsg, "src", src);
>>    if (err)
>>    	return err;
>>    err = devlink_fmsg_something(fmsg, foo, bar);
>>    if (err)
>> 	return err;
>>    // and so on...
>>    err = devlink_fmsg_obj_nest_end(fmsg);
>>
>> With retaining error API that translates to:
>>    devlink_fmsg_obj_nest_start(fmsg);
>>    devlink_fmsg_string_pair_put(fmsg, "src", src);
>>    devlink_fmsg_something(fmsg, foo, bar);
>>    // and so on...
>>    devlink_fmsg_obj_nest_end(fmsg);
>>
>> What means we check error just when is time to send.
>>
>> Possible error scenarios are developer error (API misuse) and memory
>> exhaustion, both cases are good candidates to choose readability
>> over fastest possible exit.
>>
>> Note that this patch keeps returning errors, to allow per-driver conversion
>> to the new API, but those are not needed at this point already.
>>
>> This commit itself is an illustration of benefits for the dev-user,
>> more of it will be in separate commits of the series.
>>
>> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
>> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
>> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> 
> ...
> 
>> @@ -1027,14 +934,12 @@ int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
> 
> Hi Przemek,
> 
> The line before this hunk is:
> 
> 		err = devlink_fmsg_binary_put(fmsg, value + offset, data_size);
> 
> And, as of this patch, the implementation of
> devlink_fmsg_binary_pair_nest_start() looks like this:
> 
> int devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
>                              u16 value_len)
> {
>          if (!fmsg->putting_binary)
>                  return -EINVAL;
> 
>          return devlink_fmsg_put_value(fmsg, value, value_len, NLA_BINARY);
> }
> 
> Which may return an error, if the if condition is met, without setting
> fmsg->err.
> 
>>   		if (err)
>>   			break;
>>   		/* Exit from loop with a break (instead of
>> -		 * return) to make sure putting_binary is turned off in
>> -		 * devlink_fmsg_binary_pair_nest_end
>> +		 * return) to make sure putting_binary is turned off
>>   		 */
>>   	}
>>   
>> -	end_err = devlink_fmsg_binary_pair_nest_end(fmsg);
>> -	if (end_err)
>> -		err = end_err;
> 
> Prior to this patch, the value of err from the loop above was preserved,
> unless devlink_fmsg_binary_pair_nest_end generated an error.
> 
>> +	err = devlink_fmsg_binary_pair_nest_end(fmsg);
> 
> But now it looks like this is only the case if fmsg->err corresponds to err
> when the loop was exited.
> 
> Or in other words, the err returned by devlink_fmsg_binary_put()
> is not propagated to the caller if !fmsg->putting_binary.
> 
> If so, is this intentional?

In scope of devlink_fmsg_binary_pair_put() all it's fine, and perhaps
that lead me into thinking that it's fine in *general*, which is not,
as devlink_fmsg_binary_put() is exported (so it's return value should
be preserved).

On the other note, it's called in two places (one of which was just
covered, and the second place is mlx5e_health_rsc_fmsg_binary(), which
really just mimics what we have here. So this is also fine in practice.

Last patch of the series fixes it for general case, so barring
pathological cherry-picks or reverts we are safe.
Do you want a v4 with that fixed?

Other thing is that this function could be changed into some internal 
helper without export.

> 
>> +	fmsg->putting_binary = false;
>>   
>>   	return err;
>>   }
>> -- 
>> 2.38.1
>>
> 

[PATCH net-next v3 02/11] netdevsim: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 2/2 grow/shrink: 0/2 up/down: 424/-705 (-281)
---
 drivers/net/netdevsim/health.c | 118 +++++++++------------------------
 1 file changed, 32 insertions(+), 86 deletions(-)

diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c
index eb04ed715d2d..70e8bdf34be9 100644
--- a/drivers/net/netdevsim/health.c
+++ b/drivers/net/netdevsim/health.c
@@ -63,126 +63,72 @@ nsim_dev_dummy_reporter_recover(struct devlink_health_reporter *reporter,
 static int nsim_dev_dummy_fmsg_put(struct devlink_fmsg *fmsg, u32 binary_len)
 {
 	char *binary;
-	int err;
 	int i;
 
-	err = devlink_fmsg_bool_pair_put(fmsg, "test_bool", true);
-	if (err)
-		return err;
-	err = devlink_fmsg_u8_pair_put(fmsg, "test_u8", 1);
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "test_u32", 3);
-	if (err)
-		return err;
-	err = devlink_fmsg_u64_pair_put(fmsg, "test_u64", 4);
-	if (err)
-		return err;
-	err = devlink_fmsg_string_pair_put(fmsg, "test_string", "somestring");
-	if (err)
-		return err;
+	devlink_fmsg_bool_pair_put(fmsg, "test_bool", true);
+	devlink_fmsg_u8_pair_put(fmsg, "test_u8", 1);
+	devlink_fmsg_u32_pair_put(fmsg, "test_u32", 3);
+	devlink_fmsg_u64_pair_put(fmsg, "test_u64", 4);
+	devlink_fmsg_string_pair_put(fmsg, "test_string", "somestring");
 
 	binary = kmalloc(binary_len, GFP_KERNEL | __GFP_NOWARN);
 	if (!binary)
 		return -ENOMEM;
 	get_random_bytes(binary, binary_len);
-	err = devlink_fmsg_binary_pair_put(fmsg, "test_binary", binary, binary_len);
+	devlink_fmsg_binary_pair_put(fmsg, "test_binary", binary, binary_len);
 	kfree(binary);
-	if (err)
-		return err;
 
-	err = devlink_fmsg_pair_nest_start(fmsg, "test_nest");
-	if (err)
-		return err;
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-	err = devlink_fmsg_bool_pair_put(fmsg, "nested_test_bool", false);
-	if (err)
-		return err;
-	err = devlink_fmsg_u8_pair_put(fmsg, "nested_test_u8", false);
-	if (err)
-		return err;
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	if (err)
-		return err;
+	devlink_fmsg_pair_nest_start(fmsg, "test_nest");
+	devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_bool_pair_put(fmsg, "nested_test_bool", false);
+	devlink_fmsg_u8_pair_put(fmsg, "nested_test_u8", false);
+	devlink_fmsg_obj_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_start(fmsg, "test_u32_array");
 
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
-	if (err)
-		return err;
+	for (i = 0; i < 10; i++)
+		devlink_fmsg_u32_put(fmsg, i);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_start(fmsg, "test_array_of_objects");
 
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_u32_array");
-	if (err)
-		return err;
 	for (i = 0; i < 10; i++) {
-		err = devlink_fmsg_u32_put(fmsg, i);
-		if (err)
-			return err;
+		devlink_fmsg_obj_nest_start(fmsg);
+		devlink_fmsg_bool_pair_put(fmsg, "in_array_nested_test_bool",
+					   false);
+		devlink_fmsg_u8_pair_put(fmsg, "in_array_nested_test_u8", i);
+		devlink_fmsg_obj_nest_end(fmsg);
 	}
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
-	if (err)
-		return err;
+	devlink_fmsg_arr_pair_nest_end(fmsg);
 
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_array_of_objects");
-	if (err)
-		return err;
-	for (i = 0; i < 10; i++) {
-		err = devlink_fmsg_obj_nest_start(fmsg);
-		if (err)
-			return err;
-		err = devlink_fmsg_bool_pair_put(fmsg,
-						 "in_array_nested_test_bool",
-						 false);
-		if (err)
-			return err;
-		err = devlink_fmsg_u8_pair_put(fmsg,
-					       "in_array_nested_test_u8",
-					       i);
-		if (err)
-			return err;
-		err = devlink_fmsg_obj_nest_end(fmsg);
-		if (err)
-			return err;
-	}
-	return devlink_fmsg_arr_pair_nest_end(fmsg);
+	return 0;
 }
 
 static int
 nsim_dev_dummy_reporter_dump(struct devlink_health_reporter *reporter,
 			     struct devlink_fmsg *fmsg, void *priv_ctx,
 			     struct netlink_ext_ack *extack)
 {
 	struct nsim_dev_health *health = devlink_health_reporter_priv(reporter);
 	struct nsim_dev_dummy_reporter_ctx *ctx = priv_ctx;
-	int err;
 
-	if (ctx) {
-		err = devlink_fmsg_string_pair_put(fmsg, "break_message",
-						   ctx->break_msg);
-		if (err)
-			return err;
-	}
+	if (ctx)
+		devlink_fmsg_string_pair_put(fmsg, "break_message", ctx->break_msg);
+
 	return nsim_dev_dummy_fmsg_put(fmsg, health->binary_len);
 }
 
 static int
 nsim_dev_dummy_reporter_diagnose(struct devlink_health_reporter *reporter,
 				 struct devlink_fmsg *fmsg,
 				 struct netlink_ext_ack *extack)
 {
 	struct nsim_dev_health *health = devlink_health_reporter_priv(reporter);
-	int err;
 
-	if (health->recovered_break_msg) {
-		err = devlink_fmsg_string_pair_put(fmsg,
-						   "recovered_break_message",
-						   health->recovered_break_msg);
-		if (err)
-			return err;
-	}
+	if (health->recovered_break_msg)
+		devlink_fmsg_string_pair_put(fmsg, "recovered_break_message",
+					     health->recovered_break_msg);
+
 	return nsim_dev_dummy_fmsg_put(fmsg, health->binary_len);
 }
 
-- 
2.38.1

Re: [PATCH net-next v3 02/11] netdevsim: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:38PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Reviewed-by: Jakub Kicinski <kuba@kernel.org>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 03/11] pds_core: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-57 (-57)
---
 drivers/net/ethernet/amd/pds_core/devlink.c | 29 ++++++---------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/drivers/net/ethernet/amd/pds_core/devlink.c b/drivers/net/ethernet/amd/pds_core/devlink.c
index d9607033bbf2..8b2b9e0d59f3 100644
--- a/drivers/net/ethernet/amd/pds_core/devlink.c
+++ b/drivers/net/ethernet/amd/pds_core/devlink.c
@@ -154,33 +154,20 @@ int pdsc_fw_reporter_diagnose(struct devlink_health_reporter *reporter,
 			      struct netlink_ext_ack *extack)
 {
 	struct pdsc *pdsc = devlink_health_reporter_priv(reporter);
-	int err;
 
 	mutex_lock(&pdsc->config_lock);
-
 	if (test_bit(PDSC_S_FW_DEAD, &pdsc->state))
-		err = devlink_fmsg_string_pair_put(fmsg, "Status", "dead");
+		devlink_fmsg_string_pair_put(fmsg, "Status", "dead");
 	else if (!pdsc_is_fw_good(pdsc))
-		err = devlink_fmsg_string_pair_put(fmsg, "Status", "unhealthy");
+		devlink_fmsg_string_pair_put(fmsg, "Status", "unhealthy");
 	else
-		err = devlink_fmsg_string_pair_put(fmsg, "Status", "healthy");
-
+		devlink_fmsg_string_pair_put(fmsg, "Status", "healthy");
 	mutex_unlock(&pdsc->config_lock);
 
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "State",
-					pdsc->fw_status &
-						~PDS_CORE_FW_STS_F_GENERATION);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "Generation",
-					pdsc->fw_generation >> 4);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "State",
+				  pdsc->fw_status & ~PDS_CORE_FW_STS_F_GENERATION);
+	devlink_fmsg_u32_pair_put(fmsg, "Generation", pdsc->fw_generation >> 4);
+	devlink_fmsg_u32_pair_put(fmsg, "Recoveries", pdsc->fw_recoveries);
 
-	return devlink_fmsg_u32_pair_put(fmsg, "Recoveries",
-					 pdsc->fw_recoveries);
+	return 0;
 }
-- 
2.38.1

Re: [PATCH net-next v3 03/11] pds_core: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:39PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 04/11] bnxt_en: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-125 (-125)
---
 .../net/ethernet/broadcom/bnxt/bnxt_devlink.c | 93 +++++++------------
 1 file changed, 32 insertions(+), 61 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
index 8b3e7697390f..09254e8a62d0 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
@@ -104,80 +104,58 @@ static int bnxt_fw_diagnose(struct devlink_health_reporter *reporter,
 	struct bnxt *bp = devlink_health_reporter_priv(reporter);
 	struct bnxt_fw_health *h = bp->fw_health;
 	u32 fw_status, fw_resets;
-	int rc;
 
-	if (test_bit(BNXT_STATE_IN_FW_RESET, &bp->state))
-		return devlink_fmsg_string_pair_put(fmsg, "Status", "recovering");
+	if (test_bit(BNXT_STATE_IN_FW_RESET, &bp->state)) {
+		devlink_fmsg_string_pair_put(fmsg, "Status", "recovering");
+		return 0;
+	}
 
-	if (!h->status_reliable)
-		return devlink_fmsg_string_pair_put(fmsg, "Status", "unknown");
+	if (!h->status_reliable) {
+		devlink_fmsg_string_pair_put(fmsg, "Status", "unknown");
+		return 0;
+	}
 
 	mutex_lock(&h->lock);
 	fw_status = bnxt_fw_health_readl(bp, BNXT_FW_HEALTH_REG);
 	if (BNXT_FW_IS_BOOTING(fw_status)) {
-		rc = devlink_fmsg_string_pair_put(fmsg, "Status", "initializing");
-		if (rc)
-			goto unlock;
+		devlink_fmsg_string_pair_put(fmsg, "Status", "initializing");
 	} else if (h->severity || fw_status != BNXT_FW_STATUS_HEALTHY) {
 		if (!h->severity) {
 			h->severity = SEVERITY_FATAL;
 			h->remedy = REMEDY_POWER_CYCLE_DEVICE;
 			h->diagnoses++;
 			devlink_health_report(h->fw_reporter,
 					      "FW error diagnosed", h);
 		}
-		rc = devlink_fmsg_string_pair_put(fmsg, "Status", "error");
-		if (rc)
-			goto unlock;
-		rc = devlink_fmsg_u32_pair_put(fmsg, "Syndrome", fw_status);
-		if (rc)
-			goto unlock;
+		devlink_fmsg_string_pair_put(fmsg, "Status", "error");
+		devlink_fmsg_u32_pair_put(fmsg, "Syndrome", fw_status);
 	} else {
-		rc = devlink_fmsg_string_pair_put(fmsg, "Status", "healthy");
-		if (rc)
-			goto unlock;
+		devlink_fmsg_string_pair_put(fmsg, "Status", "healthy");
 	}
 
-	rc = devlink_fmsg_string_pair_put(fmsg, "Severity",
-					  bnxt_health_severity_str(h->severity));
-	if (rc)
-		goto unlock;
+	devlink_fmsg_string_pair_put(fmsg, "Severity",
+				     bnxt_health_severity_str(h->severity));
 
 	if (h->severity) {
-		rc = devlink_fmsg_string_pair_put(fmsg, "Remedy",
-						  bnxt_health_remedy_str(h->remedy));
-		if (rc)
-			goto unlock;
-		if (h->remedy == REMEDY_DEVLINK_RECOVER) {
-			rc = devlink_fmsg_string_pair_put(fmsg, "Impact",
-							  "traffic+ntuple_cfg");
-			if (rc)
-				goto unlock;
-		}
+		devlink_fmsg_string_pair_put(fmsg, "Remedy",
+					     bnxt_health_remedy_str(h->remedy));
+		if (h->remedy == REMEDY_DEVLINK_RECOVER)
+			devlink_fmsg_string_pair_put(fmsg, "Impact",
+						     "traffic+ntuple_cfg");
 	}
 
-unlock:
 	mutex_unlock(&h->lock);
-	if (rc || !h->resets_reliable)
-		return rc;
+	if (!h->resets_reliable)
+		return 0;
 
 	fw_resets = bnxt_fw_health_readl(bp, BNXT_FW_RESET_CNT_REG);
-	rc = devlink_fmsg_u32_pair_put(fmsg, "Resets", fw_resets);
-	if (rc)
-		return rc;
-	rc = devlink_fmsg_u32_pair_put(fmsg, "Arrests", h->arrests);
-	if (rc)
-		return rc;
-	rc = devlink_fmsg_u32_pair_put(fmsg, "Survivals", h->survivals);
-	if (rc)
-		return rc;
-	rc = devlink_fmsg_u32_pair_put(fmsg, "Discoveries", h->discoveries);
-	if (rc)
-		return rc;
-	rc = devlink_fmsg_u32_pair_put(fmsg, "Fatalities", h->fatalities);
-	if (rc)
-		return rc;
-	return devlink_fmsg_u32_pair_put(fmsg, "Diagnoses", h->diagnoses);
+	devlink_fmsg_u32_pair_put(fmsg, "Resets", fw_resets);
+	devlink_fmsg_u32_pair_put(fmsg, "Arrests", h->arrests);
+	devlink_fmsg_u32_pair_put(fmsg, "Survivals", h->survivals);
+	devlink_fmsg_u32_pair_put(fmsg, "Discoveries", h->discoveries);
+	devlink_fmsg_u32_pair_put(fmsg, "Fatalities", h->fatalities);
+	devlink_fmsg_u32_pair_put(fmsg, "Diagnoses", h->diagnoses);
+	return 0;
 }
 
 static int bnxt_fw_dump(struct devlink_health_reporter *reporter,
@@ -203,19 +181,12 @@ static int bnxt_fw_dump(struct devlink_health_reporter *reporter,
 
 	rc = bnxt_get_coredump(bp, BNXT_DUMP_LIVE, data, &dump_len);
 	if (!rc) {
-		rc = devlink_fmsg_pair_nest_start(fmsg, "core");
-		if (rc)
-			goto exit;
-		rc = devlink_fmsg_binary_pair_put(fmsg, "data", data, dump_len);
-		if (rc)
-			goto exit;
-		rc = devlink_fmsg_u32_pair_put(fmsg, "size", dump_len);
-		if (rc)
-			goto exit;
-		rc = devlink_fmsg_pair_nest_end(fmsg);
+		devlink_fmsg_pair_nest_start(fmsg, "core");
+		devlink_fmsg_binary_pair_put(fmsg, "data", data, dump_len);
+		devlink_fmsg_u32_pair_put(fmsg, "size", dump_len);
+		devlink_fmsg_pair_nest_end(fmsg);
 	}
 
-exit:
 	vfree(data);
 	return rc;
 }
-- 
2.38.1

Re: [PATCH net-next v3 04/11] bnxt_en: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:40PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 05/11] hinic: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-317 (-317)
---
 .../net/ethernet/huawei/hinic/hinic_devlink.c | 217 +++++-------------
 1 file changed, 56 insertions(+), 161 deletions(-)

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_devlink.c b/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
index 1749d26f4bef..03e42512a2d5 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
@@ -315,220 +315,115 @@ void hinic_devlink_unregister(struct hinic_devlink_priv *priv)
 	devlink_unregister(devlink);
 }
 
-static int chip_fault_show(struct devlink_fmsg *fmsg,
-			   struct hinic_fault_event *event)
+static void chip_fault_show(struct devlink_fmsg *fmsg,
+			    struct hinic_fault_event *event)
 {
 	const char * const level_str[FAULT_LEVEL_MAX + 1] = {
 		"fatal", "reset", "flr", "general", "suggestion", "Unknown"};
 	u8 fault_level;
-	int err;
 
 	fault_level = (event->event.chip.err_level < FAULT_LEVEL_MAX) ?
 		event->event.chip.err_level : FAULT_LEVEL_MAX;
-	if (fault_level == FAULT_LEVEL_SERIOUS_FLR) {
-		err = devlink_fmsg_u32_pair_put(fmsg, "Function level err func_id",
-						(u32)event->event.chip.func_id);
-		if (err)
-			return err;
-	}
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "module_id", event->event.chip.node_id);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "err_type", (u32)event->event.chip.err_type);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_string_pair_put(fmsg, "err_level", level_str[fault_level]);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "err_csr_addr",
-					event->event.chip.err_csr_addr);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "err_csr_value",
-					event->event.chip.err_csr_value);
-	if (err)
-		return err;
-
-	return 0;
+	if (fault_level == FAULT_LEVEL_SERIOUS_FLR)
+		devlink_fmsg_u32_pair_put(fmsg, "Function level err func_id",
+					  (u32)event->event.chip.func_id);
+	devlink_fmsg_u8_pair_put(fmsg, "module_id", event->event.chip.node_id);
+	devlink_fmsg_u32_pair_put(fmsg, "err_type", (u32)event->event.chip.err_type);
+	devlink_fmsg_string_pair_put(fmsg, "err_level", level_str[fault_level]);
+	devlink_fmsg_u32_pair_put(fmsg, "err_csr_addr",
+				  event->event.chip.err_csr_addr);
+	devlink_fmsg_u32_pair_put(fmsg, "err_csr_value",
+				  event->event.chip.err_csr_value);
 }
 
-static int fault_report_show(struct devlink_fmsg *fmsg,
-			     struct hinic_fault_event *event)
+static void fault_report_show(struct devlink_fmsg *fmsg,
+			      struct hinic_fault_event *event)
 {
 	const char * const type_str[FAULT_TYPE_MAX + 1] = {
 		"chip", "ucode", "mem rd timeout", "mem wr timeout",
 		"reg rd timeout", "reg wr timeout", "phy fault", "Unknown"};
 	u8 fault_type;
-	int err;
 
 	fault_type = (event->type < FAULT_TYPE_MAX) ? event->type : FAULT_TYPE_MAX;
 
-	err = devlink_fmsg_string_pair_put(fmsg, "Fault type", type_str[fault_type]);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_binary_pair_put(fmsg, "Fault raw data",
-					   event->event.val, sizeof(event->event.val));
-	if (err)
-		return err;
+	devlink_fmsg_string_pair_put(fmsg, "Fault type", type_str[fault_type]);
+	devlink_fmsg_binary_pair_put(fmsg, "Fault raw data", event->event.val,
+				     sizeof(event->event.val));
 
 	switch (event->type) {
 	case FAULT_TYPE_CHIP:
-		err = chip_fault_show(fmsg, event);
-		if (err)
-			return err;
+		chip_fault_show(fmsg, event);
 		break;
 	case FAULT_TYPE_UCODE:
-		err = devlink_fmsg_u8_pair_put(fmsg, "Cause_id", event->event.ucode.cause_id);
-		if (err)
-			return err;
-		err = devlink_fmsg_u8_pair_put(fmsg, "core_id", event->event.ucode.core_id);
-		if (err)
-			return err;
-		err = devlink_fmsg_u8_pair_put(fmsg, "c_id", event->event.ucode.c_id);
-		if (err)
-			return err;
-		err = devlink_fmsg_u8_pair_put(fmsg, "epc", event->event.ucode.epc);
-		if (err)
-			return err;
+		devlink_fmsg_u8_pair_put(fmsg, "Cause_id", event->event.ucode.cause_id);
+		devlink_fmsg_u8_pair_put(fmsg, "core_id", event->event.ucode.core_id);
+		devlink_fmsg_u8_pair_put(fmsg, "c_id", event->event.ucode.c_id);
+		devlink_fmsg_u8_pair_put(fmsg, "epc", event->event.ucode.epc);
 		break;
 	case FAULT_TYPE_MEM_RD_TIMEOUT:
 	case FAULT_TYPE_MEM_WR_TIMEOUT:
-		err = devlink_fmsg_u32_pair_put(fmsg, "Err_csr_ctrl",
-						event->event.mem_timeout.err_csr_ctrl);
-		if (err)
-			return err;
-		err = devlink_fmsg_u32_pair_put(fmsg, "err_csr_data",
-						event->event.mem_timeout.err_csr_data);
-		if (err)
-			return err;
-		err = devlink_fmsg_u32_pair_put(fmsg, "ctrl_tab",
-						event->event.mem_timeout.ctrl_tab);
-		if (err)
-			return err;
-		err = devlink_fmsg_u32_pair_put(fmsg, "mem_index",
-						event->event.mem_timeout.mem_index);
-		if (err)
-			return err;
+		devlink_fmsg_u32_pair_put(fmsg, "Err_csr_ctrl",
+					  event->event.mem_timeout.err_csr_ctrl);
+		devlink_fmsg_u32_pair_put(fmsg, "err_csr_data",
+					  event->event.mem_timeout.err_csr_data);
+		devlink_fmsg_u32_pair_put(fmsg, "ctrl_tab",
+					  event->event.mem_timeout.ctrl_tab);
+		devlink_fmsg_u32_pair_put(fmsg, "mem_index",
+					  event->event.mem_timeout.mem_index);
 		break;
 	case FAULT_TYPE_REG_RD_TIMEOUT:
 	case FAULT_TYPE_REG_WR_TIMEOUT:
-		err = devlink_fmsg_u32_pair_put(fmsg, "Err_csr", event->event.reg_timeout.err_csr);
-		if (err)
-			return err;
+		devlink_fmsg_u32_pair_put(fmsg, "Err_csr", event->event.reg_timeout.err_csr);
 		break;
 	case FAULT_TYPE_PHY_FAULT:
-		err = devlink_fmsg_u8_pair_put(fmsg, "Op_type", event->event.phy_fault.op_type);
-		if (err)
-			return err;
-		err = devlink_fmsg_u8_pair_put(fmsg, "port_id", event->event.phy_fault.port_id);
-		if (err)
-			return err;
-		err = devlink_fmsg_u8_pair_put(fmsg, "dev_ad", event->event.phy_fault.dev_ad);
-		if (err)
-			return err;
-
-		err = devlink_fmsg_u32_pair_put(fmsg, "csr_addr", event->event.phy_fault.csr_addr);
-		if (err)
-			return err;
-		err = devlink_fmsg_u32_pair_put(fmsg, "op_data", event->event.phy_fault.op_data);
-		if (err)
-			return err;
+		devlink_fmsg_u8_pair_put(fmsg, "Op_type", event->event.phy_fault.op_type);
+		devlink_fmsg_u8_pair_put(fmsg, "port_id", event->event.phy_fault.port_id);
+		devlink_fmsg_u8_pair_put(fmsg, "dev_ad", event->event.phy_fault.dev_ad);
+		devlink_fmsg_u32_pair_put(fmsg, "csr_addr", event->event.phy_fault.csr_addr);
+		devlink_fmsg_u32_pair_put(fmsg, "op_data", event->event.phy_fault.op_data);
 		break;
 	default:
 		break;
 	}
-
-	return 0;
 }
 
 static int hinic_hw_reporter_dump(struct devlink_health_reporter *reporter,
 				  struct devlink_fmsg *fmsg, void *priv_ctx,
 				  struct netlink_ext_ack *extack)
 {
 	if (priv_ctx)
-		return fault_report_show(fmsg, priv_ctx);
+		fault_report_show(fmsg, priv_ctx);
 
 	return 0;
 }
 
-static int mgmt_watchdog_report_show(struct devlink_fmsg *fmsg,
-				     struct hinic_mgmt_watchdog_info *watchdog_info)
+static void mgmt_watchdog_report_show(struct devlink_fmsg *fmsg,
+				      struct hinic_mgmt_watchdog_info *winfo)
 {
-	int err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "Mgmt deadloop time_h", watchdog_info->curr_time_h);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "time_l", watchdog_info->curr_time_l);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "task_id", watchdog_info->task_id);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "sp", watchdog_info->sp);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "stack_current_used", watchdog_info->curr_used);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "peak_used", watchdog_info->peak_used);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "\n Overflow_flag", watchdog_info->is_overflow);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "stack_top", watchdog_info->stack_top);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "stack_bottom", watchdog_info->stack_bottom);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "mgmt_pc", watchdog_info->pc);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "lr", watchdog_info->lr);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "cpsr", watchdog_info->cpsr);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_binary_pair_put(fmsg, "Mgmt register info",
-					   watchdog_info->reg, sizeof(watchdog_info->reg));
-	if (err)
-		return err;
-
-	err = devlink_fmsg_binary_pair_put(fmsg, "Mgmt dump stack(start from sp)",
-					   watchdog_info->data, sizeof(watchdog_info->data));
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_u32_pair_put(fmsg, "Mgmt deadloop time_h", winfo->curr_time_h);
+	devlink_fmsg_u32_pair_put(fmsg, "time_l", winfo->curr_time_l);
+	devlink_fmsg_u32_pair_put(fmsg, "task_id", winfo->task_id);
+	devlink_fmsg_u32_pair_put(fmsg, "sp", winfo->sp);
+	devlink_fmsg_u32_pair_put(fmsg, "stack_current_used", winfo->curr_used);
+	devlink_fmsg_u32_pair_put(fmsg, "peak_used", winfo->peak_used);
+	devlink_fmsg_u32_pair_put(fmsg, "\n Overflow_flag", winfo->is_overflow);
+	devlink_fmsg_u32_pair_put(fmsg, "stack_top", winfo->stack_top);
+	devlink_fmsg_u32_pair_put(fmsg, "stack_bottom", winfo->stack_bottom);
+	devlink_fmsg_u32_pair_put(fmsg, "mgmt_pc", winfo->pc);
+	devlink_fmsg_u32_pair_put(fmsg, "lr", winfo->lr);
+	devlink_fmsg_u32_pair_put(fmsg, "cpsr", winfo->cpsr);
+	devlink_fmsg_binary_pair_put(fmsg, "Mgmt register info", winfo->reg,
+				     sizeof(winfo->reg));
+	devlink_fmsg_binary_pair_put(fmsg, "Mgmt dump stack(start from sp)",
+				     winfo->data, sizeof(winfo->data));
 }
 
 static int hinic_fw_reporter_dump(struct devlink_health_reporter *reporter,
 				  struct devlink_fmsg *fmsg, void *priv_ctx,
 				  struct netlink_ext_ack *extack)
 {
 	if (priv_ctx)
-		return mgmt_watchdog_report_show(fmsg, priv_ctx);
+		mgmt_watchdog_report_show(fmsg, priv_ctx);
 
 	return 0;
 }
-- 
2.38.1

Re: [PATCH net-next v3 05/11] hinic: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:41PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 06/11] octeontx2-af: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 0/0 grow/shrink: 2/2 up/down: 150/-585 (-435)
---
 .../marvell/octeontx2/af/rvu_devlink.c        | 464 +++++-------------
 1 file changed, 133 insertions(+), 331 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
index 41df5ac23f92..c70932625d0d 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
@@ -14,26 +14,16 @@
 
 #define DRV_NAME "octeontx2-af"
 
-static int rvu_report_pair_start(struct devlink_fmsg *fmsg, const char *name)
+static void rvu_report_pair_start(struct devlink_fmsg *fmsg, const char *name)
 {
-	int err;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
-	return  devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_pair_nest_start(fmsg, name);
+	devlink_fmsg_obj_nest_start(fmsg);
 }
 
-static int rvu_report_pair_end(struct devlink_fmsg *fmsg)
+static void rvu_report_pair_end(struct devlink_fmsg *fmsg)
 {
-	int err;
-
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return devlink_fmsg_pair_nest_end(fmsg);
+	devlink_fmsg_obj_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 
 static bool rvu_common_request_irq(struct rvu *rvu, int offset,
@@ -284,175 +274,81 @@ static int rvu_nix_report_show(struct devlink_fmsg *fmsg, void *ctx,
 {
 	struct rvu_nix_event_ctx *nix_event_context;
 	u64 intr_val;
-	int err;
 
 	nix_event_context = ctx;
 	switch (health_reporter) {
 	case NIX_AF_RVU_INTR:
 		intr_val = nix_event_context->nix_af_rvu_int;
-		err = rvu_report_pair_start(fmsg, "NIX_AF_RVU");
-		if (err)
-			return err;
-		err = devlink_fmsg_u64_pair_put(fmsg, "\tNIX RVU Interrupt Reg ",
-						nix_event_context->nix_af_rvu_int);
-		if (err)
-			return err;
-		if (intr_val & BIT_ULL(0)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tUnmap Slot Error");
-			if (err)
-				return err;
-		}
-		err = rvu_report_pair_end(fmsg);
-		if (err)
-			return err;
+		rvu_report_pair_start(fmsg, "NIX_AF_RVU");
+		devlink_fmsg_u64_pair_put(fmsg, "\tNIX RVU Interrupt Reg ",
+					  nix_event_context->nix_af_rvu_int);
+		if (intr_val & BIT_ULL(0))
+			devlink_fmsg_string_put(fmsg, "\n\tUnmap Slot Error");
+		rvu_report_pair_end(fmsg);
 		break;
 	case NIX_AF_RVU_GEN:
 		intr_val = nix_event_context->nix_af_rvu_gen;
-		err = rvu_report_pair_start(fmsg, "NIX_AF_GENERAL");
-		if (err)
-			return err;
-		err = devlink_fmsg_u64_pair_put(fmsg, "\tNIX General Interrupt Reg ",
-						nix_event_context->nix_af_rvu_gen);
-		if (err)
-			return err;
-		if (intr_val & BIT_ULL(0)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tRx multicast pkt drop");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(1)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tRx mirror pkt drop");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(4)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tSMQ flush done");
-			if (err)
-				return err;
-		}
-		err = rvu_report_pair_end(fmsg);
-		if (err)
-			return err;
+		rvu_report_pair_start(fmsg, "NIX_AF_GENERAL");
+		devlink_fmsg_u64_pair_put(fmsg, "\tNIX General Interrupt Reg ",
+					  nix_event_context->nix_af_rvu_gen);
+		if (intr_val & BIT_ULL(0))
+			devlink_fmsg_string_put(fmsg, "\n\tRx multicast pkt drop");
+		if (intr_val & BIT_ULL(1))
+			devlink_fmsg_string_put(fmsg, "\n\tRx mirror pkt drop");
+		if (intr_val & BIT_ULL(4))
+			devlink_fmsg_string_put(fmsg, "\n\tSMQ flush done");
+		rvu_report_pair_end(fmsg);
 		break;
 	case NIX_AF_RVU_ERR:
 		intr_val = nix_event_context->nix_af_rvu_err;
-		err = rvu_report_pair_start(fmsg, "NIX_AF_ERR");
-		if (err)
-			return err;
-		err = devlink_fmsg_u64_pair_put(fmsg, "\tNIX Error Interrupt Reg ",
-						nix_event_context->nix_af_rvu_err);
-		if (err)
-			return err;
-		if (intr_val & BIT_ULL(14)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on NIX_AQ_INST_S read");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(13)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on NIX_AQ_RES_S write");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(12)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tAQ Doorbell Error");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(6)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tRx on unmapped PF_FUNC");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(5)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tRx multicast replication error");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(4)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on NIX_RX_MCE_S read");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(3)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on multicast WQE read");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(2)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on mirror WQE read");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(1)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on mirror pkt write");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(0)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on multicast pkt write");
-			if (err)
-				return err;
-		}
-		err = rvu_report_pair_end(fmsg);
-		if (err)
-			return err;
+		rvu_report_pair_start(fmsg, "NIX_AF_ERR");
+		devlink_fmsg_u64_pair_put(fmsg, "\tNIX Error Interrupt Reg ",
+					  nix_event_context->nix_af_rvu_err);
+		if (intr_val & BIT_ULL(14))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on NIX_AQ_INST_S read");
+		if (intr_val & BIT_ULL(13))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on NIX_AQ_RES_S write");
+		if (intr_val & BIT_ULL(12))
+			devlink_fmsg_string_put(fmsg, "\n\tAQ Doorbell Error");
+		if (intr_val & BIT_ULL(6))
+			devlink_fmsg_string_put(fmsg, "\n\tRx on unmapped PF_FUNC");
+		if (intr_val & BIT_ULL(5))
+			devlink_fmsg_string_put(fmsg, "\n\tRx multicast replication error");
+		if (intr_val & BIT_ULL(4))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on NIX_RX_MCE_S read");
+		if (intr_val & BIT_ULL(3))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on multicast WQE read");
+		if (intr_val & BIT_ULL(2))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on mirror WQE read");
+		if (intr_val & BIT_ULL(1))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on mirror pkt write");
+		if (intr_val & BIT_ULL(0))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on multicast pkt write");
+		rvu_report_pair_end(fmsg);
 		break;
 	case NIX_AF_RVU_RAS:
 		intr_val = nix_event_context->nix_af_rvu_err;
-		err = rvu_report_pair_start(fmsg, "NIX_AF_RAS");
-		if (err)
-			return err;
-		err = devlink_fmsg_u64_pair_put(fmsg, "\tNIX RAS Interrupt Reg ",
-						nix_event_context->nix_af_rvu_err);
-		if (err)
-			return err;
-		err = devlink_fmsg_string_put(fmsg, "\n\tPoison Data on:");
-		if (err)
-			return err;
-		if (intr_val & BIT_ULL(34)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX_AQ_INST_S");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(33)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX_AQ_RES_S");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(32)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tHW ctx");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(4)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tPacket from mirror buffer");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(3)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tPacket from multicast buffer");
-
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(2)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tWQE read from mirror buffer");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(1)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tWQE read from multicast buffer");
-			if (err)
-				return err;
-		}
-		if (intr_val & BIT_ULL(0)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX_RX_MCE_S read");
-			if (err)
-				return err;
-		}
-		err = rvu_report_pair_end(fmsg);
-		if (err)
-			return err;
+		rvu_report_pair_start(fmsg, "NIX_AF_RAS");
+		devlink_fmsg_u64_pair_put(fmsg, "\tNIX RAS Interrupt Reg ",
+					  nix_event_context->nix_af_rvu_err);
+		devlink_fmsg_string_put(fmsg, "\n\tPoison Data on:");
+		if (intr_val & BIT_ULL(34))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX_AQ_INST_S");
+		if (intr_val & BIT_ULL(33))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX_AQ_RES_S");
+		if (intr_val & BIT_ULL(32))
+			devlink_fmsg_string_put(fmsg, "\n\tHW ctx");
+		if (intr_val & BIT_ULL(4))
+			devlink_fmsg_string_put(fmsg, "\n\tPacket from mirror buffer");
+		if (intr_val & BIT_ULL(3))
+			devlink_fmsg_string_put(fmsg, "\n\tPacket from multicast buffer");
+		if (intr_val & BIT_ULL(2))
+			devlink_fmsg_string_put(fmsg, "\n\tWQE read from mirror buffer");
+		if (intr_val & BIT_ULL(1))
+			devlink_fmsg_string_put(fmsg, "\n\tWQE read from multicast buffer");
+		if (intr_val & BIT_ULL(0))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX_RX_MCE_S read");
+		rvu_report_pair_end(fmsg);
 		break;
 	default:
 		return -EINVAL;
@@ -922,181 +818,87 @@ static int rvu_npa_report_show(struct devlink_fmsg *fmsg, void *ctx,
 	struct rvu_npa_event_ctx *npa_event_context;
 	unsigned int alloc_dis, free_dis;
 	u64 intr_val;
-	int err;
 
 	npa_event_context = ctx;
 	switch (health_reporter) {
 	case NPA_AF_RVU_GEN:
 		intr_val = npa_event_context->npa_af_rvu_gen;
-		err = rvu_report_pair_start(fmsg, "NPA_AF_GENERAL");
-		if (err)
-			return err;
-		err = devlink_fmsg_u64_pair_put(fmsg, "\tNPA General Interrupt Reg ",
-						npa_event_context->npa_af_rvu_gen);
-		if (err)
-			return err;
-		if (intr_val & BIT_ULL(32)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tUnmap PF Error");
-			if (err)
-				return err;
-		}
+		rvu_report_pair_start(fmsg, "NPA_AF_GENERAL");
+		devlink_fmsg_u64_pair_put(fmsg, "\tNPA General Interrupt Reg ",
+					  npa_event_context->npa_af_rvu_gen);
+		if (intr_val & BIT_ULL(32))
+			devlink_fmsg_string_put(fmsg, "\n\tUnmap PF Error");
 
 		free_dis = FIELD_GET(GENMASK(15, 0), intr_val);
-		if (free_dis & BIT(NPA_INPQ_NIX0_RX)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX0: free disabled RX");
-			if (err)
-				return err;
-		}
-		if (free_dis & BIT(NPA_INPQ_NIX0_TX)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX0:free disabled TX");
-			if (err)
-				return err;
-		}
-		if (free_dis & BIT(NPA_INPQ_NIX1_RX)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX1: free disabled RX");
-			if (err)
-				return err;
-		}
-		if (free_dis & BIT(NPA_INPQ_NIX1_TX)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX1:free disabled TX");
-			if (err)
-				return err;
-		}
-		if (free_dis & BIT(NPA_INPQ_SSO)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFree Disabled for SSO");
-			if (err)
-				return err;
-		}
-		if (free_dis & BIT(NPA_INPQ_TIM)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFree Disabled for TIM");
-			if (err)
-				return err;
-		}
-		if (free_dis & BIT(NPA_INPQ_DPI)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFree Disabled for DPI");
-			if (err)
-				return err;
-		}
-		if (free_dis & BIT(NPA_INPQ_AURA_OP)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFree Disabled for AURA");
-			if (err)
-				return err;
-		}
+		if (free_dis & BIT(NPA_INPQ_NIX0_RX))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX0: free disabled RX");
+		if (free_dis & BIT(NPA_INPQ_NIX0_TX))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX0:free disabled TX");
+		if (free_dis & BIT(NPA_INPQ_NIX1_RX))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX1: free disabled RX");
+		if (free_dis & BIT(NPA_INPQ_NIX1_TX))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX1:free disabled TX");
+		if (free_dis & BIT(NPA_INPQ_SSO))
+			devlink_fmsg_string_put(fmsg, "\n\tFree Disabled for SSO");
+		if (free_dis & BIT(NPA_INPQ_TIM))
+			devlink_fmsg_string_put(fmsg, "\n\tFree Disabled for TIM");
+		if (free_dis & BIT(NPA_INPQ_DPI))
+			devlink_fmsg_string_put(fmsg, "\n\tFree Disabled for DPI");
+		if (free_dis & BIT(NPA_INPQ_AURA_OP))
+			devlink_fmsg_string_put(fmsg, "\n\tFree Disabled for AURA");
 
 		alloc_dis = FIELD_GET(GENMASK(31, 16), intr_val);
-		if (alloc_dis & BIT(NPA_INPQ_NIX0_RX)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX0: alloc disabled RX");
-			if (err)
-				return err;
-		}
-		if (alloc_dis & BIT(NPA_INPQ_NIX0_TX)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX0:alloc disabled TX");
-			if (err)
-				return err;
-		}
-		if (alloc_dis & BIT(NPA_INPQ_NIX1_RX)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX1: alloc disabled RX");
-			if (err)
-				return err;
-		}
-		if (alloc_dis & BIT(NPA_INPQ_NIX1_TX)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tNIX1:alloc disabled TX");
-			if (err)
-				return err;
-		}
-		if (alloc_dis & BIT(NPA_INPQ_SSO)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tAlloc Disabled for SSO");
-			if (err)
-				return err;
-		}
-		if (alloc_dis & BIT(NPA_INPQ_TIM)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tAlloc Disabled for TIM");
-			if (err)
-				return err;
-		}
-		if (alloc_dis & BIT(NPA_INPQ_DPI)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tAlloc Disabled for DPI");
-			if (err)
-				return err;
-		}
-		if (alloc_dis & BIT(NPA_INPQ_AURA_OP)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tAlloc Disabled for AURA");
-			if (err)
-				return err;
-		}
-		err = rvu_report_pair_end(fmsg);
-		if (err)
-			return err;
+		if (alloc_dis & BIT(NPA_INPQ_NIX0_RX))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX0: alloc disabled RX");
+		if (alloc_dis & BIT(NPA_INPQ_NIX0_TX))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX0:alloc disabled TX");
+		if (alloc_dis & BIT(NPA_INPQ_NIX1_RX))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX1: alloc disabled RX");
+		if (alloc_dis & BIT(NPA_INPQ_NIX1_TX))
+			devlink_fmsg_string_put(fmsg, "\n\tNIX1:alloc disabled TX");
+		if (alloc_dis & BIT(NPA_INPQ_SSO))
+			devlink_fmsg_string_put(fmsg, "\n\tAlloc Disabled for SSO");
+		if (alloc_dis & BIT(NPA_INPQ_TIM))
+			devlink_fmsg_string_put(fmsg, "\n\tAlloc Disabled for TIM");
+		if (alloc_dis & BIT(NPA_INPQ_DPI))
+			devlink_fmsg_string_put(fmsg, "\n\tAlloc Disabled for DPI");
+		if (alloc_dis & BIT(NPA_INPQ_AURA_OP))
+			devlink_fmsg_string_put(fmsg, "\n\tAlloc Disabled for AURA");
+
+		rvu_report_pair_end(fmsg);
 		break;
 	case NPA_AF_RVU_ERR:
-		err = rvu_report_pair_start(fmsg, "NPA_AF_ERR");
-		if (err)
-			return err;
-		err = devlink_fmsg_u64_pair_put(fmsg, "\tNPA Error Interrupt Reg ",
-						npa_event_context->npa_af_rvu_err);
-		if (err)
-			return err;
-
-		if (npa_event_context->npa_af_rvu_err & BIT_ULL(14)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on NPA_AQ_INST_S read");
-			if (err)
-				return err;
-		}
-		if (npa_event_context->npa_af_rvu_err & BIT_ULL(13)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tFault on NPA_AQ_RES_S write");
-			if (err)
-				return err;
-		}
-		if (npa_event_context->npa_af_rvu_err & BIT_ULL(12)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tAQ Doorbell Error");
-			if (err)
-				return err;
-		}
-		err = rvu_report_pair_end(fmsg);
-		if (err)
-			return err;
+		rvu_report_pair_start(fmsg, "NPA_AF_ERR");
+		devlink_fmsg_u64_pair_put(fmsg, "\tNPA Error Interrupt Reg ",
+					  npa_event_context->npa_af_rvu_err);
+		if (npa_event_context->npa_af_rvu_err & BIT_ULL(14))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on NPA_AQ_INST_S read");
+		if (npa_event_context->npa_af_rvu_err & BIT_ULL(13))
+			devlink_fmsg_string_put(fmsg, "\n\tFault on NPA_AQ_RES_S write");
+		if (npa_event_context->npa_af_rvu_err & BIT_ULL(12))
+			devlink_fmsg_string_put(fmsg, "\n\tAQ Doorbell Error");
+		rvu_report_pair_end(fmsg);
 		break;
 	case NPA_AF_RVU_RAS:
-		err = rvu_report_pair_start(fmsg, "NPA_AF_RVU_RAS");
-		if (err)
-			return err;
-		err = devlink_fmsg_u64_pair_put(fmsg, "\tNPA RAS Interrupt Reg ",
-						npa_event_context->npa_af_rvu_ras);
-		if (err)
-			return err;
-		if (npa_event_context->npa_af_rvu_ras & BIT_ULL(34)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tPoison data on NPA_AQ_INST_S");
-			if (err)
-				return err;
-		}
-		if (npa_event_context->npa_af_rvu_ras & BIT_ULL(33)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tPoison data on NPA_AQ_RES_S");
-			if (err)
-				return err;
-		}
-		if (npa_event_context->npa_af_rvu_ras & BIT_ULL(32)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tPoison data on HW context");
-			if (err)
-				return err;
-		}
-		err = rvu_report_pair_end(fmsg);
-		if (err)
-			return err;
+		rvu_report_pair_start(fmsg, "NPA_AF_RVU_RAS");
+		devlink_fmsg_u64_pair_put(fmsg, "\tNPA RAS Interrupt Reg ",
+					  npa_event_context->npa_af_rvu_ras);
+		if (npa_event_context->npa_af_rvu_ras & BIT_ULL(34))
+			devlink_fmsg_string_put(fmsg, "\n\tPoison data on NPA_AQ_INST_S");
+		if (npa_event_context->npa_af_rvu_ras & BIT_ULL(33))
+			devlink_fmsg_string_put(fmsg, "\n\tPoison data on NPA_AQ_RES_S");
+		if (npa_event_context->npa_af_rvu_ras & BIT_ULL(32))
+			devlink_fmsg_string_put(fmsg, "\n\tPoison data on HW context");
+		rvu_report_pair_end(fmsg);
 		break;
 	case NPA_AF_RVU_INTR:
-		err = rvu_report_pair_start(fmsg, "NPA_AF_RVU");
-		if (err)
-			return err;
-		err = devlink_fmsg_u64_pair_put(fmsg, "\tNPA RVU Interrupt Reg ",
-						npa_event_context->npa_af_rvu_int);
-		if (err)
-			return err;
-		if (npa_event_context->npa_af_rvu_int & BIT_ULL(0)) {
-			err = devlink_fmsg_string_put(fmsg, "\n\tUnmap Slot Error");
-			if (err)
-				return err;
-		}
-		return rvu_report_pair_end(fmsg);
+		rvu_report_pair_start(fmsg, "NPA_AF_RVU");
+		devlink_fmsg_u64_pair_put(fmsg, "\tNPA RVU Interrupt Reg ",
+					  npa_event_context->npa_af_rvu_int);
+		if (npa_event_context->npa_af_rvu_int & BIT_ULL(0))
+			devlink_fmsg_string_put(fmsg, "\n\tUnmap Slot Error");
+		rvu_report_pair_end(fmsg);
+		break;
 	default:
 		return -EINVAL;
 	}
-- 
2.38.1

Re: [PATCH net-next v3 06/11] octeontx2-af: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:42PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 07/11] mlxsw: core: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 0/8 grow/shrink: 0/3 up/down: 0/-694 (-694)
---
 drivers/net/ethernet/mellanox/mlxsw/core.c | 171 ++++++---------------
 1 file changed, 47 insertions(+), 124 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index 1ccf3b73ed72..6df0711607ac 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -1792,122 +1792,78 @@ static void mlxsw_core_health_listener_func(const struct mlxsw_reg_info *reg,
 static const struct mlxsw_listener mlxsw_core_health_listener =
 	MLXSW_CORE_EVENTL(mlxsw_core_health_listener_func, MFDE);
 
-static int
+static void
 mlxsw_core_health_fw_fatal_dump_fatal_cause(const char *mfde_pl,
 					    struct devlink_fmsg *fmsg)
 {
 	u32 val, tile_v;
-	int err;
 
 	val = mlxsw_reg_mfde_fatal_cause_id_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "cause_id", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "cause_id", val);
 	tile_v = mlxsw_reg_mfde_fatal_cause_tile_v_get(mfde_pl);
 	if (tile_v) {
 		val = mlxsw_reg_mfde_fatal_cause_tile_index_get(mfde_pl);
-		err = devlink_fmsg_u8_pair_put(fmsg, "tile_index", val);
-		if (err)
-			return err;
+		devlink_fmsg_u8_pair_put(fmsg, "tile_index", val);
 	}
-
-	return 0;
 }
 
-static int
+static void
 mlxsw_core_health_fw_fatal_dump_fw_assert(const char *mfde_pl,
 					  struct devlink_fmsg *fmsg)
 {
 	u32 val, tile_v;
-	int err;
 
 	val = mlxsw_reg_mfde_fw_assert_var0_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "var0", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "var0", val);
 	val = mlxsw_reg_mfde_fw_assert_var1_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "var1", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "var1", val);
 	val = mlxsw_reg_mfde_fw_assert_var2_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "var2", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "var2", val);
 	val = mlxsw_reg_mfde_fw_assert_var3_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "var3", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "var3", val);
 	val = mlxsw_reg_mfde_fw_assert_var4_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "var4", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "var4", val);
 	val = mlxsw_reg_mfde_fw_assert_existptr_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "existptr", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "existptr", val);
 	val = mlxsw_reg_mfde_fw_assert_callra_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "callra", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "callra", val);
 	val = mlxsw_reg_mfde_fw_assert_oe_get(mfde_pl);
-	err = devlink_fmsg_bool_pair_put(fmsg, "old_event", val);
-	if (err)
-		return err;
+	devlink_fmsg_bool_pair_put(fmsg, "old_event", val);
 	tile_v = mlxsw_reg_mfde_fw_assert_tile_v_get(mfde_pl);
 	if (tile_v) {
 		val = mlxsw_reg_mfde_fw_assert_tile_index_get(mfde_pl);
-		err = devlink_fmsg_u8_pair_put(fmsg, "tile_index", val);
-		if (err)
-			return err;
+		devlink_fmsg_u8_pair_put(fmsg, "tile_index", val);
 	}
 	val = mlxsw_reg_mfde_fw_assert_ext_synd_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "ext_synd", val);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_u32_pair_put(fmsg, "ext_synd", val);
 }
 
-static int
+static void
 mlxsw_core_health_fw_fatal_dump_kvd_im_stop(const char *mfde_pl,
 					    struct devlink_fmsg *fmsg)
 {
 	u32 val;
-	int err;
 
 	val = mlxsw_reg_mfde_kvd_im_stop_oe_get(mfde_pl);
-	err = devlink_fmsg_bool_pair_put(fmsg, "old_event", val);
-	if (err)
-		return err;
+	devlink_fmsg_bool_pair_put(fmsg, "old_event", val);
 	val = mlxsw_reg_mfde_kvd_im_stop_pipes_mask_get(mfde_pl);
-	return devlink_fmsg_u32_pair_put(fmsg, "pipes_mask", val);
+	devlink_fmsg_u32_pair_put(fmsg, "pipes_mask", val);
 }
 
-static int
+static void
 mlxsw_core_health_fw_fatal_dump_crspace_to(const char *mfde_pl,
 					   struct devlink_fmsg *fmsg)
 {
 	u32 val;
-	int err;
 
 	val = mlxsw_reg_mfde_crspace_to_log_address_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "log_address", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "log_address", val);
 	val = mlxsw_reg_mfde_crspace_to_oe_get(mfde_pl);
-	err = devlink_fmsg_bool_pair_put(fmsg, "old_event", val);
-	if (err)
-		return err;
+	devlink_fmsg_bool_pair_put(fmsg, "old_event", val);
 	val = mlxsw_reg_mfde_crspace_to_log_id_get(mfde_pl);
-	err = devlink_fmsg_u8_pair_put(fmsg, "log_irisc_id", val);
-	if (err)
-		return err;
+	devlink_fmsg_u8_pair_put(fmsg, "log_irisc_id", val);
 	val = mlxsw_reg_mfde_crspace_to_log_ip_get(mfde_pl);
-	err = devlink_fmsg_u64_pair_put(fmsg, "log_ip", val);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_u64_pair_put(fmsg, "log_ip", val);
 }
 
 static int mlxsw_core_health_fw_fatal_dump(struct devlink_health_reporter *reporter,
@@ -1918,24 +1874,17 @@ static int mlxsw_core_health_fw_fatal_dump(struct devlink_health_reporter *repor
 	char *val_str;
 	u8 event_id;
 	u32 val;
-	int err;
 
 	if (!priv_ctx)
 		/* User-triggered dumps are not possible */
 		return -EOPNOTSUPP;
 
 	val = mlxsw_reg_mfde_irisc_id_get(mfde_pl);
-	err = devlink_fmsg_u8_pair_put(fmsg, "irisc_id", val);
-	if (err)
-		return err;
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "event");
-	if (err)
-		return err;
+	devlink_fmsg_u8_pair_put(fmsg, "irisc_id", val);
 
+	devlink_fmsg_arr_pair_nest_start(fmsg, "event");
 	event_id = mlxsw_reg_mfde_event_id_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "id", event_id);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "id", event_id);
 	switch (event_id) {
 	case MLXSW_REG_MFDE_EVENT_ID_CRSPACE_TO:
 		val_str = "CR space timeout";
@@ -1955,24 +1904,13 @@ static int mlxsw_core_health_fw_fatal_dump(struct devlink_health_reporter *repor
 	default:
 		val_str = NULL;
 	}
-	if (val_str) {
-		err = devlink_fmsg_string_pair_put(fmsg, "desc", val_str);
-		if (err)
-			return err;
-	}
-
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "severity");
-	if (err)
-		return err;
+	if (val_str)
+		devlink_fmsg_string_pair_put(fmsg, "desc", val_str);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
 
+	devlink_fmsg_arr_pair_nest_start(fmsg, "severity");
 	val = mlxsw_reg_mfde_severity_get(mfde_pl);
-	err = devlink_fmsg_u8_pair_put(fmsg, "id", val);
-	if (err)
-		return err;
+	devlink_fmsg_u8_pair_put(fmsg, "id", val);
 	switch (val) {
 	case MLXSW_REG_MFDE_SEVERITY_FATL:
 		val_str = "Fatal";
@@ -1986,15 +1924,9 @@ static int mlxsw_core_health_fw_fatal_dump(struct devlink_health_reporter *repor
 	default:
 		val_str = NULL;
 	}
-	if (val_str) {
-		err = devlink_fmsg_string_pair_put(fmsg, "desc", val_str);
-		if (err)
-			return err;
-	}
-
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
-	if (err)
-		return err;
+	if (val_str)
+		devlink_fmsg_string_pair_put(fmsg, "desc", val_str);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
 
 	val = mlxsw_reg_mfde_method_get(mfde_pl);
 	switch (val) {
@@ -2007,16 +1939,11 @@ static int mlxsw_core_health_fw_fatal_dump(struct devlink_health_reporter *repor
 	default:
 		val_str = NULL;
 	}
-	if (val_str) {
-		err = devlink_fmsg_string_pair_put(fmsg, "method", val_str);
-		if (err)
-			return err;
-	}
+	if (val_str)
+		devlink_fmsg_string_pair_put(fmsg, "method", val_str);
 
 	val = mlxsw_reg_mfde_long_process_get(mfde_pl);
-	err = devlink_fmsg_bool_pair_put(fmsg, "long_process", val);
-	if (err)
-		return err;
+	devlink_fmsg_bool_pair_put(fmsg, "long_process", val);
 
 	val = mlxsw_reg_mfde_command_type_get(mfde_pl);
 	switch (val) {
@@ -2032,29 +1959,25 @@ static int mlxsw_core_health_fw_fatal_dump(struct devlink_health_reporter *repor
 	default:
 		val_str = NULL;
 	}
-	if (val_str) {
-		err = devlink_fmsg_string_pair_put(fmsg, "command_type", val_str);
-		if (err)
-			return err;
-	}
+	if (val_str)
+		devlink_fmsg_string_pair_put(fmsg, "command_type", val_str);
 
 	val = mlxsw_reg_mfde_reg_attr_id_get(mfde_pl);
-	err = devlink_fmsg_u32_pair_put(fmsg, "reg_attr_id", val);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "reg_attr_id", val);
 
 	switch (event_id) {
 	case MLXSW_REG_MFDE_EVENT_ID_CRSPACE_TO:
-		return mlxsw_core_health_fw_fatal_dump_crspace_to(mfde_pl,
-								  fmsg);
+		mlxsw_core_health_fw_fatal_dump_crspace_to(mfde_pl, fmsg);
+		break;
 	case MLXSW_REG_MFDE_EVENT_ID_KVD_IM_STOP:
-		return mlxsw_core_health_fw_fatal_dump_kvd_im_stop(mfde_pl,
-								   fmsg);
+		mlxsw_core_health_fw_fatal_dump_kvd_im_stop(mfde_pl, fmsg);
+		break;
 	case MLXSW_REG_MFDE_EVENT_ID_FW_ASSERT:
-		return mlxsw_core_health_fw_fatal_dump_fw_assert(mfde_pl, fmsg);
+		mlxsw_core_health_fw_fatal_dump_fw_assert(mfde_pl, fmsg);
+		break;
 	case MLXSW_REG_MFDE_EVENT_ID_FATAL_CAUSE:
-		return mlxsw_core_health_fw_fatal_dump_fatal_cause(mfde_pl,
-								   fmsg);
+		mlxsw_core_health_fw_fatal_dump_fatal_cause(mfde_pl, fmsg);
+		break;
 	}
 
 	return 0;
-- 
2.38.1

Re: [PATCH net-next v3 07/11] mlxsw: core: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:43PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 08/11] net/mlx5: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 4/4 grow/shrink: 3/20 up/down: 937/-2411 (-1474)
---
 .../mellanox/mlx5/core/diag/fw_tracer.c       |  49 +-
 .../mellanox/mlx5/core/diag/reporter_vnic.c   | 118 ++---
 .../mellanox/mlx5/core/diag/reporter_vnic.h   |   6 +-
 .../ethernet/mellanox/mlx5/core/en/health.c   | 187 ++------
 .../ethernet/mellanox/mlx5/core/en/health.h   |  14 +-
 .../mellanox/mlx5/core/en/reporter_rx.c       | 426 +++++-------------
 .../mellanox/mlx5/core/en/reporter_tx.c       | 346 ++++----------
 .../net/ethernet/mellanox/mlx5/core/en_rep.c  |   5 +-
 .../net/ethernet/mellanox/mlx5/core/health.c  | 127 ++----
 9 files changed, 330 insertions(+), 948 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
index 7c0f2adbea00..7714eedf82b3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
@@ -889,45 +889,24 @@ int mlx5_fw_tracer_trigger_core_dump_general(struct mlx5_core_dev *dev)
 	return 0;
 }
 
-static int
+static void
 mlx5_devlink_fmsg_fill_trace(struct devlink_fmsg *fmsg,
 			     struct mlx5_fw_trace_data *trace_data)
 {
-	int err;
-
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u64_pair_put(fmsg, "timestamp", trace_data->timestamp);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_bool_pair_put(fmsg, "lost", trace_data->lost);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "event_id", trace_data->event_id);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_string_pair_put(fmsg, "msg", trace_data->msg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-	return 0;
+	devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_u64_pair_put(fmsg, "timestamp", trace_data->timestamp);
+	devlink_fmsg_bool_pair_put(fmsg, "lost", trace_data->lost);
+	devlink_fmsg_u8_pair_put(fmsg, "event_id", trace_data->event_id);
+	devlink_fmsg_string_pair_put(fmsg, "msg", trace_data->msg);
+	devlink_fmsg_obj_nest_end(fmsg);
 }
 
 int mlx5_fw_tracer_get_saved_traces_objects(struct mlx5_fw_tracer *tracer,
 					    struct devlink_fmsg *fmsg)
 {
 	struct mlx5_fw_trace_data *straces = tracer->st_arr.straces;
 	u32 index, start_index, end_index;
 	u32 saved_traces_index;
-	int err;
 
 	if (!straces[0].timestamp)
 		return -ENOMSG;
@@ -940,22 +919,18 @@ int mlx5_fw_tracer_get_saved_traces_objects(struct mlx5_fw_tracer *tracer,
 		start_index = 0;
 	end_index = (saved_traces_index - 1) & (SAVED_TRACES_NUM - 1);
 
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "dump fw traces");
-	if (err)
-		goto unlock;
+	devlink_fmsg_arr_pair_nest_start(fmsg, "dump fw traces");
 	index = start_index;
 	while (index != end_index) {
-		err = mlx5_devlink_fmsg_fill_trace(fmsg, &straces[index]);
-		if (err)
-			goto unlock;
+		mlx5_devlink_fmsg_fill_trace(fmsg, &straces[index]);
 
 		index = (index + 1) & (SAVED_TRACES_NUM - 1);
 	}
 
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
-unlock:
+	devlink_fmsg_arr_pair_nest_end(fmsg);
 	mutex_unlock(&tracer->st_arr.lock);
-	return err;
+
+	return 0;
 }
 
 static void mlx5_fw_tracer_update_db(struct work_struct *work)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/reporter_vnic.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/reporter_vnic.c
index e869c65d8e90..c7216e84ef8c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/reporter_vnic.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/reporter_vnic.c
@@ -13,115 +13,65 @@ struct mlx5_vnic_diag_stats {
 	__be64 query_vnic_env_out[MLX5_ST_SZ_QW(query_vnic_env_out)];
 };
 
-int mlx5_reporter_vnic_diagnose_counters(struct mlx5_core_dev *dev,
-					 struct devlink_fmsg *fmsg,
-					 u16 vport_num, bool other_vport)
+void mlx5_reporter_vnic_diagnose_counters(struct mlx5_core_dev *dev,
+					  struct devlink_fmsg *fmsg,
+					  u16 vport_num, bool other_vport)
 {
 	u32 in[MLX5_ST_SZ_DW(query_vnic_env_in)] = {};
 	struct mlx5_vnic_diag_stats vnic;
-	int err;
 
 	MLX5_SET(query_vnic_env_in, in, opcode, MLX5_CMD_OP_QUERY_VNIC_ENV);
 	MLX5_SET(query_vnic_env_in, in, vport_number, vport_num);
 	MLX5_SET(query_vnic_env_in, in, other_vport, !!other_vport);
 
-	err = mlx5_cmd_exec_inout(dev, query_vnic_env, in, &vnic.query_vnic_env_out);
-	if (err)
-		return err;
+	mlx5_cmd_exec_inout(dev, query_vnic_env, in, &vnic.query_vnic_env_out);
 
-	err = devlink_fmsg_pair_nest_start(fmsg, "vNIC env counters");
-	if (err)
-		return err;
-
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
+	devlink_fmsg_pair_nest_start(fmsg, "vNIC env counters");
+	devlink_fmsg_obj_nest_start(fmsg);
 
 	if (MLX5_CAP_GEN(dev, vnic_env_queue_counters)) {
-		err = devlink_fmsg_u32_pair_put(fmsg, "total_error_queues",
-						VNIC_ENV_GET(&vnic, total_error_queues));
-		if (err)
-			return err;
-
-		err = devlink_fmsg_u32_pair_put(fmsg, "send_queue_priority_update_flow",
-						VNIC_ENV_GET(&vnic,
-							     send_queue_priority_update_flow));
-		if (err)
-			return err;
+		devlink_fmsg_u32_pair_put(fmsg, "total_error_queues",
+					  VNIC_ENV_GET(&vnic, total_error_queues));
+		devlink_fmsg_u32_pair_put(fmsg, "send_queue_priority_update_flow",
+					  VNIC_ENV_GET(&vnic, send_queue_priority_update_flow));
 	}
-
 	if (MLX5_CAP_GEN(dev, eq_overrun_count)) {
-		err = devlink_fmsg_u32_pair_put(fmsg, "comp_eq_overrun",
-						VNIC_ENV_GET(&vnic, comp_eq_overrun));
-		if (err)
-			return err;
-
-		err = devlink_fmsg_u32_pair_put(fmsg, "async_eq_overrun",
-						VNIC_ENV_GET(&vnic, async_eq_overrun));
-		if (err)
-			return err;
-	}
-
-	if (MLX5_CAP_GEN(dev, vnic_env_cq_overrun)) {
-		err = devlink_fmsg_u32_pair_put(fmsg, "cq_overrun",
-						VNIC_ENV_GET(&vnic, cq_overrun));
-		if (err)
-			return err;
-	}
-
-	if (MLX5_CAP_GEN(dev, invalid_command_count)) {
-		err = devlink_fmsg_u32_pair_put(fmsg, "invalid_command",
-						VNIC_ENV_GET(&vnic, invalid_command));
-		if (err)
-			return err;
-	}
-
-	if (MLX5_CAP_GEN(dev, quota_exceeded_count)) {
-		err = devlink_fmsg_u32_pair_put(fmsg, "quota_exceeded_command",
-						VNIC_ENV_GET(&vnic, quota_exceeded_command));
-		if (err)
-			return err;
+		devlink_fmsg_u32_pair_put(fmsg, "comp_eq_overrun",
+					  VNIC_ENV_GET(&vnic, comp_eq_overrun));
+		devlink_fmsg_u32_pair_put(fmsg, "async_eq_overrun",
+					  VNIC_ENV_GET(&vnic, async_eq_overrun));
 	}
-
-	if (MLX5_CAP_GEN(dev, nic_receive_steering_discard)) {
-		err = devlink_fmsg_u64_pair_put(fmsg, "nic_receive_steering_discard",
-						VNIC_ENV_GET64(&vnic,
-							       nic_receive_steering_discard));
-		if (err)
-			return err;
-	}
-
+	if (MLX5_CAP_GEN(dev, vnic_env_cq_overrun))
+		devlink_fmsg_u32_pair_put(fmsg, "cq_overrun",
+					  VNIC_ENV_GET(&vnic, cq_overrun));
+	if (MLX5_CAP_GEN(dev, invalid_command_count))
+		devlink_fmsg_u32_pair_put(fmsg, "invalid_command",
+					  VNIC_ENV_GET(&vnic, invalid_command));
+	if (MLX5_CAP_GEN(dev, quota_exceeded_count))
+		devlink_fmsg_u32_pair_put(fmsg, "quota_exceeded_command",
+					  VNIC_ENV_GET(&vnic, quota_exceeded_command));
+	if (MLX5_CAP_GEN(dev, nic_receive_steering_discard))
+		devlink_fmsg_u64_pair_put(fmsg, "nic_receive_steering_discard",
+					  VNIC_ENV_GET64(&vnic, nic_receive_steering_discard));
 	if (MLX5_CAP_GEN(dev, vnic_env_cnt_steering_fail)) {
-		err = devlink_fmsg_u64_pair_put(fmsg, "generated_pkt_steering_fail",
-						VNIC_ENV_GET64(&vnic,
-							       generated_pkt_steering_fail));
-		if (err)
-			return err;
-
-		err = devlink_fmsg_u64_pair_put(fmsg, "handled_pkt_steering_fail",
-						VNIC_ENV_GET64(&vnic, handled_pkt_steering_fail));
-		if (err)
-			return err;
+		devlink_fmsg_u64_pair_put(fmsg, "generated_pkt_steering_fail",
+					  VNIC_ENV_GET64(&vnic, generated_pkt_steering_fail));
+		devlink_fmsg_u64_pair_put(fmsg, "handled_pkt_steering_fail",
+					  VNIC_ENV_GET64(&vnic, handled_pkt_steering_fail));
 	}
 
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_obj_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 
 static int mlx5_reporter_vnic_diagnose(struct devlink_health_reporter *reporter,
 				       struct devlink_fmsg *fmsg,
 				       struct netlink_ext_ack *extack)
 {
 	struct mlx5_core_dev *dev = devlink_health_reporter_priv(reporter);
 
-	return mlx5_reporter_vnic_diagnose_counters(dev, fmsg, 0, false);
+	mlx5_reporter_vnic_diagnose_counters(dev, fmsg, 0, false);
+	return 0;
 }
 
 static const struct devlink_health_reporter_ops mlx5_reporter_vnic_ops = {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/reporter_vnic.h b/drivers/net/ethernet/mellanox/mlx5/core/diag/reporter_vnic.h
index eba87a39e9b1..fbc31256f7fe 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/reporter_vnic.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/reporter_vnic.h
@@ -9,8 +9,8 @@
 void mlx5_reporter_vnic_create(struct mlx5_core_dev *dev);
 void mlx5_reporter_vnic_destroy(struct mlx5_core_dev *dev);
 
-int mlx5_reporter_vnic_diagnose_counters(struct mlx5_core_dev *dev,
-					 struct devlink_fmsg *fmsg,
-					 u16 vport_num, bool other_vport);
+void mlx5_reporter_vnic_diagnose_counters(struct mlx5_core_dev *dev,
+					  struct devlink_fmsg *fmsg,
+					  u16 vport_num, bool other_vport);
 
 #endif /* __MLX5_REPORTER_VNIC_H */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/health.c b/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
index 6f4e6c34b2a2..81523825faa2 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
@@ -5,134 +5,59 @@
 #include "lib/eq.h"
 #include "lib/mlx5.h"
 
-int mlx5e_health_fmsg_named_obj_nest_start(struct devlink_fmsg *fmsg, char *name)
+void mlx5e_health_fmsg_named_obj_nest_start(struct devlink_fmsg *fmsg, char *name)
 {
-	int err;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_pair_nest_start(fmsg, name);
+	devlink_fmsg_obj_nest_start(fmsg);
 }
 
-int mlx5e_health_fmsg_named_obj_nest_end(struct devlink_fmsg *fmsg)
+void mlx5e_health_fmsg_named_obj_nest_end(struct devlink_fmsg *fmsg)
 {
-	int err;
-
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_obj_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 
-int mlx5e_health_cq_diag_fmsg(struct mlx5e_cq *cq, struct devlink_fmsg *fmsg)
+void mlx5e_health_cq_diag_fmsg(struct mlx5e_cq *cq, struct devlink_fmsg *fmsg)
 {
 	u32 out[MLX5_ST_SZ_DW(query_cq_out)] = {};
 	u8 hw_status;
 	void *cqc;
-	int err;
-
-	err = mlx5_core_query_cq(cq->mdev, &cq->mcq, out);
-	if (err)
-		return err;
 
+	mlx5_core_query_cq(cq->mdev, &cq->mcq, out);
 	cqc = MLX5_ADDR_OF(query_cq_out, out, cq_context);
 	hw_status = MLX5_GET(cqc, cqc, status);
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "CQ");
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "cqn", cq->mcq.cqn);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "HW status", hw_status);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "ci", mlx5_cqwq_get_ci(&cq->wq));
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "size", mlx5_cqwq_get_size(&cq->wq));
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "CQ");
+	devlink_fmsg_u32_pair_put(fmsg, "cqn", cq->mcq.cqn);
+	devlink_fmsg_u8_pair_put(fmsg, "HW status", hw_status);
+	devlink_fmsg_u32_pair_put(fmsg, "ci", mlx5_cqwq_get_ci(&cq->wq));
+	devlink_fmsg_u32_pair_put(fmsg, "size", mlx5_cqwq_get_size(&cq->wq));
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
-int mlx5e_health_cq_common_diag_fmsg(struct mlx5e_cq *cq, struct devlink_fmsg *fmsg)
+void mlx5e_health_cq_common_diag_fmsg(struct mlx5e_cq *cq, struct devlink_fmsg *fmsg)
 {
 	u8 cq_log_stride;
 	u32 cq_sz;
-	int err;
 
 	cq_sz = mlx5_cqwq_get_size(&cq->wq);
 	cq_log_stride = mlx5_cqwq_get_log_stride_size(&cq->wq);
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "CQ");
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u64_pair_put(fmsg, "stride size", BIT(cq_log_stride));
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "size", cq_sz);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "CQ");
+	devlink_fmsg_u64_pair_put(fmsg, "stride size", BIT(cq_log_stride));
+	devlink_fmsg_u32_pair_put(fmsg, "size", cq_sz);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
-int mlx5e_health_eq_diag_fmsg(struct mlx5_eq_comp *eq, struct devlink_fmsg *fmsg)
+void mlx5e_health_eq_diag_fmsg(struct mlx5_eq_comp *eq, struct devlink_fmsg *fmsg)
 {
-	int err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "EQ");
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "eqn", eq->core.eqn);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "irqn", eq->core.irqn);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "vecidx", eq->core.vecidx);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "ci", eq->core.cons_index);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "size", eq_get_size(&eq->core));
-	if (err)
-		return err;
-
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "EQ");
+	devlink_fmsg_u8_pair_put(fmsg, "eqn", eq->core.eqn);
+	devlink_fmsg_u32_pair_put(fmsg, "irqn", eq->core.irqn);
+	devlink_fmsg_u32_pair_put(fmsg, "vecidx", eq->core.vecidx);
+	devlink_fmsg_u32_pair_put(fmsg, "ci", eq->core.cons_index);
+	devlink_fmsg_u32_pair_put(fmsg, "size", eq_get_size(&eq->core));
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
 void mlx5e_health_create_reporters(struct mlx5e_priv *priv)
@@ -235,45 +160,38 @@ int mlx5e_health_report(struct mlx5e_priv *priv,
 }
 
 #define MLX5_HEALTH_DEVLINK_MAX_SIZE 1024
-static int mlx5e_health_rsc_fmsg_binary(struct devlink_fmsg *fmsg,
-					const void *value, u32 value_len)
+static void mlx5e_health_rsc_fmsg_binary(struct devlink_fmsg *fmsg,
+					 const void *value, u32 value_len)
 
 {
 	u32 data_size;
-	int err = 0;
 	u32 offset;
 
 	for (offset = 0; offset < value_len; offset += data_size) {
 		data_size = value_len - offset;
 		if (data_size > MLX5_HEALTH_DEVLINK_MAX_SIZE)
 			data_size = MLX5_HEALTH_DEVLINK_MAX_SIZE;
-		err = devlink_fmsg_binary_put(fmsg, value + offset, data_size);
-		if (err)
-			break;
+		devlink_fmsg_binary_put(fmsg, value + offset, data_size);
 	}
-	return err;
 }
 
 int mlx5e_health_rsc_fmsg_dump(struct mlx5e_priv *priv, struct mlx5_rsc_key *key,
 			       struct devlink_fmsg *fmsg)
 {
 	struct mlx5_core_dev *mdev = priv->mdev;
 	struct mlx5_rsc_dump_cmd *cmd;
+	int cmd_err, err = 0;
 	struct page *page;
-	int cmd_err, err;
-	int end_err;
 	int size;
 
 	if (IS_ERR_OR_NULL(mdev->rsc_dump))
 		return -EOPNOTSUPP;
 
 	page = alloc_page(GFP_KERNEL);
 	if (!page)
 		return -ENOMEM;
 
-	err = devlink_fmsg_binary_pair_nest_start(fmsg, "data");
-	if (err)
-		goto free_page;
+	devlink_fmsg_binary_pair_nest_start(fmsg, "data");
 
 	cmd = mlx5_rsc_dump_cmd_create(mdev, key);
 	if (IS_ERR(cmd)) {
@@ -288,52 +206,31 @@ int mlx5e_health_rsc_fmsg_dump(struct mlx5e_priv *priv, struct mlx5_rsc_key *key
 			goto destroy_cmd;
 		}
 
-		err = mlx5e_health_rsc_fmsg_binary(fmsg, page_address(page), size);
-		if (err)
-			goto destroy_cmd;
-
+		mlx5e_health_rsc_fmsg_binary(fmsg, page_address(page), size);
 	} while (cmd_err > 0);
 
 destroy_cmd:
 	mlx5_rsc_dump_cmd_destroy(cmd);
-	end_err = devlink_fmsg_binary_pair_nest_end(fmsg);
-	if (end_err)
-		err = end_err;
+	devlink_fmsg_binary_pair_nest_end(fmsg);
 free_page:
 	__free_page(page);
 	return err;
 }
 
-int mlx5e_health_queue_dump(struct mlx5e_priv *priv, struct devlink_fmsg *fmsg,
-			    int queue_idx, char *lbl)
+void mlx5e_health_queue_dump(struct mlx5e_priv *priv, struct devlink_fmsg *fmsg,
+			     int queue_idx, char *lbl)
 {
 	struct mlx5_rsc_key key = {};
-	int err;
 
 	key.rsc = MLX5_SGMT_TYPE_FULL_QPC;
 	key.index1 = queue_idx;
 	key.size = PAGE_SIZE;
 	key.num_of_obj1 = 1;
 
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, lbl);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "index", queue_idx);
-	if (err)
-		return err;
-
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return devlink_fmsg_obj_nest_end(fmsg);
+	devlink_fmsg_obj_nest_start(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, lbl);
+	devlink_fmsg_u32_pair_put(fmsg, "index", queue_idx);
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	devlink_fmsg_obj_nest_end(fmsg);
 }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/health.h b/drivers/net/ethernet/mellanox/mlx5/core/en/health.h
index 415840c3ef84..84be3dd6f747 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/health.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/health.h
@@ -20,11 +20,11 @@ void mlx5e_reporter_tx_err_cqe(struct mlx5e_txqsq *sq);
 int mlx5e_reporter_tx_timeout(struct mlx5e_txqsq *sq);
 void mlx5e_reporter_tx_ptpsq_unhealthy(struct mlx5e_ptpsq *ptpsq);
 
-int mlx5e_health_cq_diag_fmsg(struct mlx5e_cq *cq, struct devlink_fmsg *fmsg);
-int mlx5e_health_cq_common_diag_fmsg(struct mlx5e_cq *cq, struct devlink_fmsg *fmsg);
-int mlx5e_health_eq_diag_fmsg(struct mlx5_eq_comp *eq, struct devlink_fmsg *fmsg);
-int mlx5e_health_fmsg_named_obj_nest_start(struct devlink_fmsg *fmsg, char *name);
-int mlx5e_health_fmsg_named_obj_nest_end(struct devlink_fmsg *fmsg);
+void mlx5e_health_cq_diag_fmsg(struct mlx5e_cq *cq, struct devlink_fmsg *fmsg);
+void mlx5e_health_cq_common_diag_fmsg(struct mlx5e_cq *cq, struct devlink_fmsg *fmsg);
+void mlx5e_health_eq_diag_fmsg(struct mlx5_eq_comp *eq, struct devlink_fmsg *fmsg);
+void mlx5e_health_fmsg_named_obj_nest_start(struct devlink_fmsg *fmsg, char *name);
+void mlx5e_health_fmsg_named_obj_nest_end(struct devlink_fmsg *fmsg);
 
 void mlx5e_reporter_rx_create(struct mlx5e_priv *priv);
 void mlx5e_reporter_rx_destroy(struct mlx5e_priv *priv);
@@ -54,6 +54,6 @@ void mlx5e_health_destroy_reporters(struct mlx5e_priv *priv);
 void mlx5e_health_channels_update(struct mlx5e_priv *priv);
 int mlx5e_health_rsc_fmsg_dump(struct mlx5e_priv *priv, struct mlx5_rsc_key *key,
 			       struct devlink_fmsg *fmsg);
-int mlx5e_health_queue_dump(struct mlx5e_priv *priv, struct devlink_fmsg *fmsg,
-			    int queue_idx, char *lbl);
+void mlx5e_health_queue_dump(struct mlx5e_priv *priv, struct devlink_fmsg *fmsg,
+			     int queue_idx, char *lbl);
 #endif
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
index e8eea9ffd5eb..fc5a9fdd06db 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
@@ -199,78 +199,38 @@ static int mlx5e_rx_reporter_recover(struct devlink_health_reporter *reporter,
 			 mlx5e_health_recover_channels(priv);
 }
 
-static int mlx5e_reporter_icosq_diagnose(struct mlx5e_icosq *icosq, u8 hw_state,
-					 struct devlink_fmsg *fmsg)
+static void mlx5e_reporter_icosq_diagnose(struct mlx5e_icosq *icosq, u8 hw_state,
+					  struct devlink_fmsg *fmsg)
 {
-	int err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "ICOSQ");
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "sqn", icosq->sqn);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "HW state", hw_state);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "cc", icosq->cc);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "pc", icosq->pc);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "WQE size",
-					mlx5_wq_cyc_get_size(&icosq->wq));
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "CQ");
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "cqn", icosq->cq.mcq.cqn);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "cc", icosq->cq.wq.cc);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "size", mlx5_cqwq_get_size(&icosq->cq.wq));
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "ICOSQ");
+	devlink_fmsg_u32_pair_put(fmsg, "sqn", icosq->sqn);
+	devlink_fmsg_u8_pair_put(fmsg, "HW state", hw_state);
+	devlink_fmsg_u32_pair_put(fmsg, "cc", icosq->cc);
+	devlink_fmsg_u32_pair_put(fmsg, "pc", icosq->pc);
+	devlink_fmsg_u32_pair_put(fmsg, "WQE size", mlx5_wq_cyc_get_size(&icosq->wq));
+
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "CQ");
+	devlink_fmsg_u32_pair_put(fmsg, "cqn", icosq->cq.mcq.cqn);
+	devlink_fmsg_u32_pair_put(fmsg, "cc", icosq->cq.wq.cc);
+	devlink_fmsg_u32_pair_put(fmsg, "size", mlx5_cqwq_get_size(&icosq->cq.wq));
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
-static int mlx5e_health_rq_put_sw_state(struct devlink_fmsg *fmsg, struct mlx5e_rq *rq)
+static void mlx5e_health_rq_put_sw_state(struct devlink_fmsg *fmsg, struct mlx5e_rq *rq)
 {
-	int err;
 	int i;
 
 	BUILD_BUG_ON_MSG(ARRAY_SIZE(rq_sw_state_type_name) != MLX5E_NUM_RQ_STATES,
 			 "rq_sw_state_type_name string array must be consistent with MLX5E_RQ_STATE_* enum in en.h");
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SW State");
-	if (err)
-		return err;
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SW State");
 
-	for (i = 0; i < ARRAY_SIZE(rq_sw_state_type_name); ++i) {
-		err = devlink_fmsg_u32_pair_put(fmsg, rq_sw_state_type_name[i],
-						test_bit(i, &rq->state));
-		if (err)
-			return err;
-	}
+	for (i = 0; i < ARRAY_SIZE(rq_sw_state_type_name); ++i)
+		devlink_fmsg_u32_pair_put(fmsg, rq_sw_state_type_name[i],
+					  test_bit(i, &rq->state));
 
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
 static int
@@ -291,395 +251,221 @@ mlx5e_rx_reporter_build_diagnose_output_rq_common(struct mlx5e_rq *rq,
 	wq_head = mlx5e_rqwq_get_head(rq);
 	wqe_counter = mlx5e_rqwq_get_wqe_counter(rq);
 
-	err = devlink_fmsg_u32_pair_put(fmsg, "rqn", rq->rqn);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "HW state", hw_state);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "WQE counter", wqe_counter);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "posted WQEs", wqes_sz);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "cc", wq_head);
-	if (err)
-		return err;
-
-	err = mlx5e_health_rq_put_sw_state(fmsg, rq);
-	if (err)
-		return err;
-
-	err = mlx5e_health_cq_diag_fmsg(&rq->cq, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_eq_diag_fmsg(rq->cq.mcq.eq, fmsg);
-	if (err)
-		return err;
+	devlink_fmsg_u32_pair_put(fmsg, "rqn", rq->rqn);
+	devlink_fmsg_u8_pair_put(fmsg, "HW state", hw_state);
+	devlink_fmsg_u32_pair_put(fmsg, "WQE counter", wqe_counter);
+	devlink_fmsg_u32_pair_put(fmsg, "posted WQEs", wqes_sz);
+	devlink_fmsg_u32_pair_put(fmsg, "cc", wq_head);
+	mlx5e_health_rq_put_sw_state(fmsg, rq);
+	mlx5e_health_cq_diag_fmsg(&rq->cq, fmsg);
+	mlx5e_health_eq_diag_fmsg(rq->cq.mcq.eq, fmsg);
 
 	if (rq->icosq) {
 		struct mlx5e_icosq *icosq = rq->icosq;
 		u8 icosq_hw_state;
 
-		err = mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
-		if (err)
-			return err;
-
-		err = mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
-		if (err)
-			return err;
+		mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
+		mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
 	}
 
 	return 0;
 }
 
-static int mlx5e_rx_reporter_build_diagnose_output(struct mlx5e_rq *rq,
-						   struct devlink_fmsg *fmsg)
+static void mlx5e_rx_reporter_build_diagnose_output(struct mlx5e_rq *rq,
+						    struct devlink_fmsg *fmsg)
 {
-	int err;
-
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "channel ix", rq->ix);
-	if (err)
-		return err;
-
-	err = mlx5e_rx_reporter_build_diagnose_output_rq_common(rq, fmsg);
-	if (err)
-		return err;
-
-	return devlink_fmsg_obj_nest_end(fmsg);
+	devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_u32_pair_put(fmsg, "channel ix", rq->ix);
+	mlx5e_rx_reporter_build_diagnose_output_rq_common(rq, fmsg);
+	devlink_fmsg_obj_nest_end(fmsg);
 }
 
-static int mlx5e_rx_reporter_diagnose_generic_rq(struct mlx5e_rq *rq,
-						 struct devlink_fmsg *fmsg)
+static void mlx5e_rx_reporter_diagnose_generic_rq(struct mlx5e_rq *rq,
+						  struct devlink_fmsg *fmsg)
 {
 	struct mlx5e_priv *priv = rq->priv;
 	struct mlx5e_params *params;
 	u32 rq_stride, rq_sz;
 	bool real_time;
-	int err;
 
 	params = &priv->channels.params;
 	rq_sz = mlx5e_rqwq_get_size(rq);
 	real_time =  mlx5_is_real_time_rq(priv->mdev);
 	rq_stride = BIT(mlx5e_mpwqe_get_log_stride_size(priv->mdev, params, NULL));
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "RQ");
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "type", params->rq_wq_type);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u64_pair_put(fmsg, "stride size", rq_stride);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "size", rq_sz);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_string_pair_put(fmsg, "ts_format", real_time ? "RT" : "FRC");
-	if (err)
-		return err;
-
-	err = mlx5e_health_cq_common_diag_fmsg(&rq->cq, fmsg);
-	if (err)
-		return err;
-
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "RQ");
+	devlink_fmsg_u8_pair_put(fmsg, "type", params->rq_wq_type);
+	devlink_fmsg_u64_pair_put(fmsg, "stride size", rq_stride);
+	devlink_fmsg_u32_pair_put(fmsg, "size", rq_sz);
+	devlink_fmsg_string_pair_put(fmsg, "ts_format", real_time ? "RT" : "FRC");
+	mlx5e_health_cq_common_diag_fmsg(&rq->cq, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
-static int
+static void
 mlx5e_rx_reporter_diagnose_common_ptp_config(struct mlx5e_priv *priv, struct mlx5e_ptp *ptp_ch,
 					     struct devlink_fmsg *fmsg)
 {
-	int err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "PTP");
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "filter_type", priv->tstamp.rx_filter);
-	if (err)
-		return err;
-
-	err = mlx5e_rx_reporter_diagnose_generic_rq(&ptp_ch->rq, fmsg);
-	if (err)
-		return err;
-
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "PTP");
+	devlink_fmsg_u32_pair_put(fmsg, "filter_type", priv->tstamp.rx_filter);
+	mlx5e_rx_reporter_diagnose_generic_rq(&ptp_ch->rq, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
-static int
+static void
 mlx5e_rx_reporter_diagnose_common_config(struct devlink_health_reporter *reporter,
 					 struct devlink_fmsg *fmsg)
 {
 	struct mlx5e_priv *priv = devlink_health_reporter_priv(reporter);
 	struct mlx5e_rq *generic_rq = &priv->channels.c[0]->rq;
 	struct mlx5e_ptp *ptp_ch = priv->channels.ptp;
-	int err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "Common config");
-	if (err)
-		return err;
-
-	err = mlx5e_rx_reporter_diagnose_generic_rq(generic_rq, fmsg);
-	if (err)
-		return err;
-
-	if (ptp_ch && test_bit(MLX5E_PTP_STATE_RX, ptp_ch->state)) {
-		err = mlx5e_rx_reporter_diagnose_common_ptp_config(priv, ptp_ch, fmsg);
-		if (err)
-			return err;
-	}
 
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "Common config");
+	mlx5e_rx_reporter_diagnose_generic_rq(generic_rq, fmsg);
+	if (ptp_ch && test_bit(MLX5E_PTP_STATE_RX, ptp_ch->state))
+		mlx5e_rx_reporter_diagnose_common_ptp_config(priv, ptp_ch, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
-static int mlx5e_rx_reporter_build_diagnose_output_ptp_rq(struct mlx5e_rq *rq,
-							  struct devlink_fmsg *fmsg)
+static void mlx5e_rx_reporter_build_diagnose_output_ptp_rq(struct mlx5e_rq *rq,
+							   struct devlink_fmsg *fmsg)
 {
-	int err;
-
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_string_pair_put(fmsg, "channel", "ptp");
-	if (err)
-		return err;
-
-	err = mlx5e_rx_reporter_build_diagnose_output_rq_common(rq, fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_string_pair_put(fmsg, "channel", "ptp");
+	mlx5e_rx_reporter_build_diagnose_output_rq_common(rq, fmsg);
+	devlink_fmsg_obj_nest_end(fmsg);
 }
 
 static int mlx5e_rx_reporter_diagnose(struct devlink_health_reporter *reporter,
 				      struct devlink_fmsg *fmsg,
 				      struct netlink_ext_ack *extack)
 {
 	struct mlx5e_priv *priv = devlink_health_reporter_priv(reporter);
 	struct mlx5e_ptp *ptp_ch = priv->channels.ptp;
-	int i, err = 0;
+	int i;
 
 	mutex_lock(&priv->state_lock);
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		goto unlock;
 
-	err = mlx5e_rx_reporter_diagnose_common_config(reporter, fmsg);
-	if (err)
-		goto unlock;
-
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "RQs");
-	if (err)
-		goto unlock;
+	mlx5e_rx_reporter_diagnose_common_config(reporter, fmsg);
+	devlink_fmsg_arr_pair_nest_start(fmsg, "RQs");
 
 	for (i = 0; i < priv->channels.num; i++) {
 		struct mlx5e_channel *c = priv->channels.c[i];
 		struct mlx5e_rq *rq;
 
 		rq = test_bit(MLX5E_CHANNEL_STATE_XSK, c->state) ?
 			&c->xskrq : &c->rq;
 
-		err = mlx5e_rx_reporter_build_diagnose_output(rq, fmsg);
-		if (err)
-			goto unlock;
-	}
-	if (ptp_ch && test_bit(MLX5E_PTP_STATE_RX, ptp_ch->state)) {
-		err = mlx5e_rx_reporter_build_diagnose_output_ptp_rq(&ptp_ch->rq, fmsg);
-		if (err)
-			goto unlock;
+		mlx5e_rx_reporter_build_diagnose_output(rq, fmsg);
 	}
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
+	if (ptp_ch && test_bit(MLX5E_PTP_STATE_RX, ptp_ch->state))
+		mlx5e_rx_reporter_build_diagnose_output_ptp_rq(&ptp_ch->rq, fmsg);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
 unlock:
 	mutex_unlock(&priv->state_lock);
-	return err;
+	return 0;
 }
 
 static int mlx5e_rx_reporter_dump_icosq(struct mlx5e_priv *priv, struct devlink_fmsg *fmsg,
 					void *ctx)
 {
 	struct mlx5e_txqsq *icosq = ctx;
 	struct mlx5_rsc_key key = {};
-	int err;
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		return 0;
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SX Slice");
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SX Slice");
 	key.size = PAGE_SIZE;
 	key.rsc = MLX5_SGMT_TYPE_SX_SLICE_ALL;
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "ICOSQ");
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "QPC");
-	if (err)
-		return err;
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "ICOSQ");
 
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "QPC");
 	key.rsc = MLX5_SGMT_TYPE_FULL_QPC;
 	key.index1 = icosq->sqn;
 	key.num_of_obj1 = 1;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "send_buff");
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "send_buff");
 	key.rsc = MLX5_SGMT_TYPE_SND_BUFF;
 	key.num_of_obj2 = MLX5_RSC_DUMP_ALL;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	return 0;
 }
 
 static int mlx5e_rx_reporter_dump_rq(struct mlx5e_priv *priv, struct devlink_fmsg *fmsg,
 				     void *ctx)
 {
 	struct mlx5_rsc_key key = {};
 	struct mlx5e_rq *rq = ctx;
-	int err;
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		return 0;
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "RX Slice");
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "RX Slice");
 	key.size = PAGE_SIZE;
 	key.rsc = MLX5_SGMT_TYPE_RX_SLICE_ALL;
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "RQ");
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "QPC");
-	if (err)
-		return err;
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "RQ");
 
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "QPC");
 	key.rsc = MLX5_SGMT_TYPE_FULL_QPC;
 	key.index1 = rq->rqn;
 	key.num_of_obj1 = 1;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "receive_buff");
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "receive_buff");
 	key.rsc = MLX5_SGMT_TYPE_RCV_BUFF;
 	key.num_of_obj2 = MLX5_RSC_DUMP_ALL;
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	return 0;
 }
 
 static int mlx5e_rx_reporter_dump_all_rqs(struct mlx5e_priv *priv,
 					  struct devlink_fmsg *fmsg)
 {
 	struct mlx5e_ptp *ptp_ch = priv->channels.ptp;
 	struct mlx5_rsc_key key = {};
-	int i, err;
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		return 0;
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "RX Slice");
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "RX Slice");
 	key.size = PAGE_SIZE;
 	key.rsc = MLX5_SGMT_TYPE_RX_SLICE_ALL;
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_start(fmsg, "RQs");
 
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "RQs");
-	if (err)
-		return err;
-
-	for (i = 0; i < priv->channels.num; i++) {
+	for (int i = 0; i < priv->channels.num; i++) {
 		struct mlx5e_rq *rq = &priv->channels.c[i]->rq;
 
-		err = mlx5e_health_queue_dump(priv, fmsg, rq->rqn, "RQ");
-		if (err)
-			return err;
+		mlx5e_health_queue_dump(priv, fmsg, rq->rqn, "RQ");
 	}
 
-	if (ptp_ch && test_bit(MLX5E_PTP_STATE_RX, ptp_ch->state)) {
-		err = mlx5e_health_queue_dump(priv, fmsg, ptp_ch->rq.rqn, "PTP RQ");
-		if (err)
-			return err;
-	}
+	if (ptp_ch && test_bit(MLX5E_PTP_STATE_RX, ptp_ch->state))
+		mlx5e_health_queue_dump(priv, fmsg, ptp_ch->rq.rqn, "PTP RQ");
 
-	return devlink_fmsg_arr_pair_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
+	return 0;
 }
 
 static int mlx5e_rx_reporter_dump_from_ctx(struct mlx5e_priv *priv,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
index ff8242f67c54..ccff7c26d6ac 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
@@ -50,25 +50,19 @@ static void mlx5e_reset_txqsq_cc_pc(struct mlx5e_txqsq *sq)
 	sq->pc = 0;
 }
 
-static int mlx5e_health_sq_put_sw_state(struct devlink_fmsg *fmsg, struct mlx5e_txqsq *sq)
+static void mlx5e_health_sq_put_sw_state(struct devlink_fmsg *fmsg, struct mlx5e_txqsq *sq)
 {
-	int err;
 	int i;
 
 	BUILD_BUG_ON_MSG(ARRAY_SIZE(sq_sw_state_type_name) != MLX5E_NUM_SQ_STATES,
 			 "sq_sw_state_type_name string array must be consistent with MLX5E_SQ_STATE_* enum in en.h");
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SW State");
-	if (err)
-		return err;
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SW State");
 
-	for (i = 0; i < ARRAY_SIZE(sq_sw_state_type_name); ++i) {
-		err = devlink_fmsg_u32_pair_put(fmsg, sq_sw_state_type_name[i],
-						test_bit(i, &sq->state));
-		if (err)
-			return err;
-	}
+	for (i = 0; i < ARRAY_SIZE(sq_sw_state_type_name); ++i)
+		devlink_fmsg_u32_pair_put(fmsg, sq_sw_state_type_name[i],
+					  test_bit(i, &sq->state));
 
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
 static int mlx5e_tx_reporter_err_cqe_recover(void *ctx)
@@ -220,329 +214,173 @@ static int mlx5e_tx_reporter_recover(struct devlink_health_reporter *reporter,
 			 mlx5e_health_recover_channels(priv);
 }
 
-static int
+static void
 mlx5e_tx_reporter_build_diagnose_output_sq_common(struct devlink_fmsg *fmsg,
 						  struct mlx5e_txqsq *sq, int tc)
 {
 	bool stopped = netif_xmit_stopped(sq->txq);
 	struct mlx5e_priv *priv = sq->priv;
 	u8 state;
-	int err;
-
-	err = mlx5_core_query_sq_state(priv->mdev, sq->sqn, &state);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "tc", tc);
-	if (err)
-		return err;
 
-	err = devlink_fmsg_u32_pair_put(fmsg, "txq ix", sq->txq_ix);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "sqn", sq->sqn);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "HW state", state);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_bool_pair_put(fmsg, "stopped", stopped);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "cc", sq->cc);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "pc", sq->pc);
-	if (err)
-		return err;
-
-	err = mlx5e_health_sq_put_sw_state(fmsg, sq);
-	if (err)
-		return err;
-
-	err = mlx5e_health_cq_diag_fmsg(&sq->cq, fmsg);
-	if (err)
-		return err;
-
-	return mlx5e_health_eq_diag_fmsg(sq->cq.mcq.eq, fmsg);
+	mlx5_core_query_sq_state(priv->mdev, sq->sqn, &state);
+	devlink_fmsg_u32_pair_put(fmsg, "tc", tc);
+	devlink_fmsg_u32_pair_put(fmsg, "txq ix", sq->txq_ix);
+	devlink_fmsg_u32_pair_put(fmsg, "sqn", sq->sqn);
+	devlink_fmsg_u8_pair_put(fmsg, "HW state", state);
+	devlink_fmsg_bool_pair_put(fmsg, "stopped", stopped);
+	devlink_fmsg_u32_pair_put(fmsg, "cc", sq->cc);
+	devlink_fmsg_u32_pair_put(fmsg, "pc", sq->pc);
+	mlx5e_health_sq_put_sw_state(fmsg, sq);
+	mlx5e_health_cq_diag_fmsg(&sq->cq, fmsg);
+	mlx5e_health_eq_diag_fmsg(sq->cq.mcq.eq, fmsg);
 }
 
-static int
+static void
 mlx5e_tx_reporter_build_diagnose_output(struct devlink_fmsg *fmsg,
 					struct mlx5e_txqsq *sq, int tc)
 {
-	int err;
-
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "channel ix", sq->ch_ix);
-	if (err)
-		return err;
-
-	err = mlx5e_tx_reporter_build_diagnose_output_sq_common(fmsg, sq, tc);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_u32_pair_put(fmsg, "channel ix", sq->ch_ix);
+	mlx5e_tx_reporter_build_diagnose_output_sq_common(fmsg, sq, tc);
+	devlink_fmsg_obj_nest_end(fmsg);
 }
 
-static int
+static void
 mlx5e_tx_reporter_build_diagnose_output_ptpsq(struct devlink_fmsg *fmsg,
 					      struct mlx5e_ptpsq *ptpsq, int tc)
 {
-	int err;
-
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_string_pair_put(fmsg, "channel", "ptp");
-	if (err)
-		return err;
-
-	err = mlx5e_tx_reporter_build_diagnose_output_sq_common(fmsg, &ptpsq->txqsq, tc);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "Port TS");
-	if (err)
-		return err;
-
-	err = mlx5e_health_cq_diag_fmsg(&ptpsq->ts_cq, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	return 0;
+	devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_string_pair_put(fmsg, "channel", "ptp");
+	mlx5e_tx_reporter_build_diagnose_output_sq_common(fmsg, &ptpsq->txqsq, tc);
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "Port TS");
+	mlx5e_health_cq_diag_fmsg(&ptpsq->ts_cq, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	devlink_fmsg_obj_nest_end(fmsg);
 }
 
-static int
+static void
 mlx5e_tx_reporter_diagnose_generic_txqsq(struct devlink_fmsg *fmsg,
 					 struct mlx5e_txqsq *txqsq)
 {
-	u32 sq_stride, sq_sz;
-	bool real_time;
-	int err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SQ");
-	if (err)
-		return err;
-
-	real_time =  mlx5_is_real_time_sq(txqsq->mdev);
-	sq_sz = mlx5_wq_cyc_get_size(&txqsq->wq);
-	sq_stride = MLX5_SEND_WQE_BB;
-
-	err = devlink_fmsg_u64_pair_put(fmsg, "stride size", sq_stride);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_u32_pair_put(fmsg, "size", sq_sz);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_string_pair_put(fmsg, "ts_format", real_time ? "RT" : "FRC");
-	if (err)
-		return err;
-
-	err = mlx5e_health_cq_common_diag_fmsg(&txqsq->cq, fmsg);
-	if (err)
-		return err;
-
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	bool real_time =  mlx5_is_real_time_sq(txqsq->mdev);
+	u32 sq_sz = mlx5_wq_cyc_get_size(&txqsq->wq);
+	u32 sq_stride = MLX5_SEND_WQE_BB;
+
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SQ");
+	devlink_fmsg_u64_pair_put(fmsg, "stride size", sq_stride);
+	devlink_fmsg_u32_pair_put(fmsg, "size", sq_sz);
+	devlink_fmsg_string_pair_put(fmsg, "ts_format", real_time ? "RT" : "FRC");
+	mlx5e_health_cq_common_diag_fmsg(&txqsq->cq, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
-static int
+static void
 mlx5e_tx_reporter_diagnose_generic_tx_port_ts(struct devlink_fmsg *fmsg,
 					      struct mlx5e_ptpsq *ptpsq)
 {
-	int err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "Port TS");
-	if (err)
-		return err;
-
-	err = mlx5e_health_cq_common_diag_fmsg(&ptpsq->ts_cq, fmsg);
-	if (err)
-		return err;
-
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "Port TS");
+	mlx5e_health_cq_common_diag_fmsg(&ptpsq->ts_cq, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
-static int
+static void
 mlx5e_tx_reporter_diagnose_common_config(struct devlink_health_reporter *reporter,
 					 struct devlink_fmsg *fmsg)
 {
 	struct mlx5e_priv *priv = devlink_health_reporter_priv(reporter);
 	struct mlx5e_txqsq *generic_sq = priv->txq2sq[0];
 	struct mlx5e_ptp *ptp_ch = priv->channels.ptp;
 	struct mlx5e_ptpsq *generic_ptpsq;
-	int err;
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "Common Config");
-	if (err)
-		return err;
-
-	err = mlx5e_tx_reporter_diagnose_generic_txqsq(fmsg, generic_sq);
-	if (err)
-		return err;
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "Common Config");
+	mlx5e_tx_reporter_diagnose_generic_txqsq(fmsg, generic_sq);
 
 	if (!ptp_ch || !test_bit(MLX5E_PTP_STATE_TX, ptp_ch->state))
 		goto out;
 
 	generic_ptpsq = &ptp_ch->ptpsq[0];
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "PTP");
-	if (err)
-		return err;
-
-	err = mlx5e_tx_reporter_diagnose_generic_txqsq(fmsg, &generic_ptpsq->txqsq);
-	if (err)
-		return err;
-
-	err = mlx5e_tx_reporter_diagnose_generic_tx_port_ts(fmsg, generic_ptpsq);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "PTP");
+	mlx5e_tx_reporter_diagnose_generic_txqsq(fmsg, &generic_ptpsq->txqsq);
+	mlx5e_tx_reporter_diagnose_generic_tx_port_ts(fmsg, generic_ptpsq);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 out:
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 }
 
 static int mlx5e_tx_reporter_diagnose(struct devlink_health_reporter *reporter,
 				      struct devlink_fmsg *fmsg,
 				      struct netlink_ext_ack *extack)
 {
 	struct mlx5e_priv *priv = devlink_health_reporter_priv(reporter);
 	struct mlx5e_ptp *ptp_ch = priv->channels.ptp;
 
-	int i, tc, err = 0;
+	int i, tc;
 
 	mutex_lock(&priv->state_lock);
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		goto unlock;
 
-	err = mlx5e_tx_reporter_diagnose_common_config(reporter, fmsg);
-	if (err)
-		goto unlock;
-
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "SQs");
-	if (err)
-		goto unlock;
+	mlx5e_tx_reporter_diagnose_common_config(reporter, fmsg);
+	devlink_fmsg_arr_pair_nest_start(fmsg, "SQs");
 
 	for (i = 0; i < priv->channels.num; i++) {
 		struct mlx5e_channel *c = priv->channels.c[i];
 
 		for (tc = 0; tc < mlx5e_get_dcb_num_tc(&priv->channels.params); tc++) {
 			struct mlx5e_txqsq *sq = &c->sq[tc];
 
-			err = mlx5e_tx_reporter_build_diagnose_output(fmsg, sq, tc);
-			if (err)
-				goto unlock;
+			mlx5e_tx_reporter_build_diagnose_output(fmsg, sq, tc);
 		}
 	}
 
 	if (!ptp_ch || !test_bit(MLX5E_PTP_STATE_TX, ptp_ch->state))
 		goto close_sqs_nest;
 
-	for (tc = 0; tc < mlx5e_get_dcb_num_tc(&priv->channels.params); tc++) {
-		err = mlx5e_tx_reporter_build_diagnose_output_ptpsq(fmsg,
-								    &ptp_ch->ptpsq[tc],
-								    tc);
-		if (err)
-			goto unlock;
-	}
+	for (tc = 0; tc < mlx5e_get_dcb_num_tc(&priv->channels.params); tc++)
+		mlx5e_tx_reporter_build_diagnose_output_ptpsq(fmsg,
+							      &ptp_ch->ptpsq[tc],
+							      tc);
 
 close_sqs_nest:
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
-	if (err)
-		goto unlock;
-
+	devlink_fmsg_arr_pair_nest_end(fmsg);
 unlock:
 	mutex_unlock(&priv->state_lock);
-	return err;
+	return 0;
 }
 
 static int mlx5e_tx_reporter_dump_sq(struct mlx5e_priv *priv, struct devlink_fmsg *fmsg,
 				     void *ctx)
 {
 	struct mlx5_rsc_key key = {};
 	struct mlx5e_txqsq *sq = ctx;
-	int err;
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		return 0;
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SX Slice");
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SX Slice");
 	key.size = PAGE_SIZE;
 	key.rsc = MLX5_SGMT_TYPE_SX_SLICE_ALL;
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SQ");
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "QPC");
-	if (err)
-		return err;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SQ");
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "QPC");
 	key.rsc = MLX5_SGMT_TYPE_FULL_QPC;
 	key.index1 = sq->sqn;
 	key.num_of_obj1 = 1;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "send_buff");
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "send_buff");
 	key.rsc = MLX5_SGMT_TYPE_SND_BUFF;
 	key.num_of_obj2 = MLX5_RSC_DUMP_ALL;
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
 
-	return mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	return 0;
 }
 
 static int mlx5e_tx_reporter_timeout_dump(struct mlx5e_priv *priv, struct devlink_fmsg *fmsg,
@@ -567,52 +405,38 @@ static int mlx5e_tx_reporter_dump_all_sqs(struct mlx5e_priv *priv,
 {
 	struct mlx5e_ptp *ptp_ch = priv->channels.ptp;
 	struct mlx5_rsc_key key = {};
-	int i, tc, err;
+	int i, tc;
 
 	if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 		return 0;
 
-	err = mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SX Slice");
-	if (err)
-		return err;
-
+	mlx5e_health_fmsg_named_obj_nest_start(fmsg, "SX Slice");
 	key.size = PAGE_SIZE;
 	key.rsc = MLX5_SGMT_TYPE_SX_SLICE_ALL;
-	err = mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
-	if (err)
-		return err;
-
-	err = mlx5e_health_fmsg_named_obj_nest_end(fmsg);
-	if (err)
-		return err;
-
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "SQs");
-	if (err)
-		return err;
+	mlx5e_health_rsc_fmsg_dump(priv, &key, fmsg);
+	mlx5e_health_fmsg_named_obj_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_start(fmsg, "SQs");
 
 	for (i = 0; i < priv->channels.num; i++) {
 		struct mlx5e_channel *c = priv->channels.c[i];
 
 		for (tc = 0; tc < mlx5e_get_dcb_num_tc(&priv->channels.params); tc++) {
 			struct mlx5e_txqsq *sq = &c->sq[tc];
 
-			err = mlx5e_health_queue_dump(priv, fmsg, sq->sqn, "SQ");
-			if (err)
-				return err;
+			mlx5e_health_queue_dump(priv, fmsg, sq->sqn, "SQ");
 		}
 	}
 
 	if (ptp_ch && test_bit(MLX5E_PTP_STATE_TX, ptp_ch->state)) {
 		for (tc = 0; tc < mlx5e_get_dcb_num_tc(&priv->channels.params); tc++) {
 			struct mlx5e_txqsq *sq = &ptp_ch->ptpsq[tc].txqsq;
 
-			err = mlx5e_health_queue_dump(priv, fmsg, sq->sqn, "PTP SQ");
-			if (err)
-				return err;
+			mlx5e_health_queue_dump(priv, fmsg, sq->sqn, "PTP SQ");
 		}
 	}
 
-	return devlink_fmsg_arr_pair_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
+	return 0;
 }
 
 static int mlx5e_tx_reporter_dump_from_ctx(struct mlx5e_priv *priv,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index 2fdb8895aecd..383af680cc8e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -1355,8 +1355,9 @@ mlx5e_rep_vnic_reporter_diagnose(struct devlink_health_reporter *reporter,
 	struct mlx5e_rep_priv *rpriv = devlink_health_reporter_priv(reporter);
 	struct mlx5_eswitch_rep *rep = rpriv->rep;
 
-	return mlx5_reporter_vnic_diagnose_counters(rep->esw->dev, fmsg,
-						    rep->vport, true);
+	mlx5_reporter_vnic_diagnose_counters(rep->esw->dev, fmsg, rep->vport,
+					     true);
+	return 0;
 }
 
 static const struct devlink_health_reporter_ops mlx5_rep_vnic_reporter_ops = {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/health.c b/drivers/net/ethernet/mellanox/mlx5/core/health.c
index 1c220048ae9a..8ff6dc9bc803 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/health.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/health.c
@@ -450,109 +450,63 @@ mlx5_fw_reporter_diagnose(struct devlink_health_reporter *reporter,
 	struct mlx5_core_dev *dev = devlink_health_reporter_priv(reporter);
 	struct mlx5_core_health *health = &dev->priv.health;
 	struct health_buffer __iomem *h = health->health;
-	u8 synd;
-	int err;
+	u8 synd = ioread8(&h->synd);
 
-	synd = ioread8(&h->synd);
-	err = devlink_fmsg_u8_pair_put(fmsg, "Syndrome", synd);
-	if (err || !synd)
-		return err;
-	return devlink_fmsg_string_pair_put(fmsg, "Description", hsynd_str(synd));
+	if (!synd)
+		return 0;
+
+	devlink_fmsg_u8_pair_put(fmsg, "Syndrome", synd);
+	devlink_fmsg_string_pair_put(fmsg, "Description", hsynd_str(synd));
+
+	return 0;
 }
 
 struct mlx5_fw_reporter_ctx {
 	u8 err_synd;
 	int miss_counter;
 };
 
-static int
+static void
 mlx5_fw_reporter_ctx_pairs_put(struct devlink_fmsg *fmsg,
 			       struct mlx5_fw_reporter_ctx *fw_reporter_ctx)
 {
-	int err;
-
-	err = devlink_fmsg_u8_pair_put(fmsg, "syndrome",
-				       fw_reporter_ctx->err_synd);
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "fw_miss_counter",
-					fw_reporter_ctx->miss_counter);
-	if (err)
-		return err;
-	return 0;
+	devlink_fmsg_u8_pair_put(fmsg, "syndrome", fw_reporter_ctx->err_synd);
+	devlink_fmsg_u32_pair_put(fmsg, "fw_miss_counter", fw_reporter_ctx->miss_counter);
 }
 
-static int
+static void
 mlx5_fw_reporter_heath_buffer_data_put(struct mlx5_core_dev *dev,
 				       struct devlink_fmsg *fmsg)
 {
 	struct mlx5_core_health *health = &dev->priv.health;
 	struct health_buffer __iomem *h = health->health;
 	u8 rfr_severity;
-	int err;
 	int i;
 
 	if (!ioread8(&h->synd))
-		return 0;
-
-	err = devlink_fmsg_pair_nest_start(fmsg, "health buffer");
-	if (err)
-		return err;
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "assert_var");
-	if (err)
-		return err;
+		return;
 
-	for (i = 0; i < ARRAY_SIZE(h->assert_var); i++) {
-		err = devlink_fmsg_u32_put(fmsg, ioread32be(h->assert_var + i));
-		if (err)
-			return err;
-	}
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "assert_exit_ptr",
-					ioread32be(&h->assert_exit_ptr));
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "assert_callra",
-					ioread32be(&h->assert_callra));
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "time", ioread32be(&h->time));
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "hw_id", ioread32be(&h->hw_id));
-	if (err)
-		return err;
+	devlink_fmsg_pair_nest_start(fmsg, "health buffer");
+	devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_arr_pair_nest_start(fmsg, "assert_var");
+	for (i = 0; i < ARRAY_SIZE(h->assert_var); i++)
+		devlink_fmsg_u32_put(fmsg, ioread32be(h->assert_var + i));
+	devlink_fmsg_arr_pair_nest_end(fmsg);
+	devlink_fmsg_u32_pair_put(fmsg, "assert_exit_ptr",
+				  ioread32be(&h->assert_exit_ptr));
+	devlink_fmsg_u32_pair_put(fmsg, "assert_callra",
+				  ioread32be(&h->assert_callra));
+	devlink_fmsg_u32_pair_put(fmsg, "time", ioread32be(&h->time));
+	devlink_fmsg_u32_pair_put(fmsg, "hw_id", ioread32be(&h->hw_id));
 	rfr_severity = ioread8(&h->rfr_severity);
-	err = devlink_fmsg_u8_pair_put(fmsg, "rfr", mlx5_health_get_rfr(rfr_severity));
-	if (err)
-		return err;
-	err = devlink_fmsg_u8_pair_put(fmsg, "severity", mlx5_health_get_severity(rfr_severity));
-	if (err)
-		return err;
-	err = devlink_fmsg_u8_pair_put(fmsg, "irisc_index",
-				       ioread8(&h->irisc_index));
-	if (err)
-		return err;
-	err = devlink_fmsg_u8_pair_put(fmsg, "synd", ioread8(&h->synd));
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "ext_synd",
-					ioread16be(&h->ext_synd));
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "raw_fw_ver",
-					ioread32be(&h->fw_ver));
-	if (err)
-		return err;
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-	return devlink_fmsg_pair_nest_end(fmsg);
+	devlink_fmsg_u8_pair_put(fmsg, "rfr", mlx5_health_get_rfr(rfr_severity));
+	devlink_fmsg_u8_pair_put(fmsg, "severity", mlx5_health_get_severity(rfr_severity));
+	devlink_fmsg_u8_pair_put(fmsg, "irisc_index", ioread8(&h->irisc_index));
+	devlink_fmsg_u8_pair_put(fmsg, "synd", ioread8(&h->synd));
+	devlink_fmsg_u32_pair_put(fmsg, "ext_synd", ioread16be(&h->ext_synd));
+	devlink_fmsg_u32_pair_put(fmsg, "raw_fw_ver", ioread32be(&h->fw_ver));
+	devlink_fmsg_obj_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 
 static int
@@ -570,14 +524,11 @@ mlx5_fw_reporter_dump(struct devlink_health_reporter *reporter,
 	if (priv_ctx) {
 		struct mlx5_fw_reporter_ctx *fw_reporter_ctx = priv_ctx;
 
-		err = mlx5_fw_reporter_ctx_pairs_put(fmsg, fw_reporter_ctx);
-		if (err)
-			return err;
+		mlx5_fw_reporter_ctx_pairs_put(fmsg, fw_reporter_ctx);
 	}
 
-	err = mlx5_fw_reporter_heath_buffer_data_put(dev, fmsg);
-	if (err)
-		return err;
+	mlx5_fw_reporter_heath_buffer_data_put(dev, fmsg);
+
 	return mlx5_fw_tracer_get_saved_traces_objects(dev->tracer, fmsg);
 }
 
@@ -643,12 +594,10 @@ mlx5_fw_fatal_reporter_dump(struct devlink_health_reporter *reporter,
 	if (priv_ctx) {
 		struct mlx5_fw_reporter_ctx *fw_reporter_ctx = priv_ctx;
 
-		err = mlx5_fw_reporter_ctx_pairs_put(fmsg, fw_reporter_ctx);
-		if (err)
-			goto free_data;
+		mlx5_fw_reporter_ctx_pairs_put(fmsg, fw_reporter_ctx);
 	}
 
-	err = devlink_fmsg_binary_pair_put(fmsg, "crdump_data", cr_data, crdump_size);
+	devlink_fmsg_binary_pair_put(fmsg, "crdump_data", cr_data, crdump_size);
 
 free_data:
 	kvfree(cr_data);
-- 
2.38.1

Re: [PATCH net-next v3 08/11] net/mlx5: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:44PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH net-next v3 08/11] net/mlx5: devlink health: use retained error fmsg API

[Dan Carpenter]

On Wed, Oct 18, 2023 at 10:26:44PM +0200, Przemek Kitszel wrote:
>  	if (rq->icosq) {
>  		struct mlx5e_icosq *icosq = rq->icosq;
>  		u8 icosq_hw_state;
>  
> -		err = mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
> -		if (err)
> -			return err;
> -
> -		err = mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
> -		if (err)
> -			return err;
> +		mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);

When we remove the error checking then Smatch correctly complains that
icosq_hw_state is used uninitialized.

    drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c:268 mlx5e_rx_reporter_build_diagnose_output_rq_common()
    error: uninitialized symbol 'icosq_hw_state'.

> +		mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
>  	}
>  
>  	return 0;
>  }

See also:
    drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c:229 mlx5e_tx_reporter_build_diagnose_output_sq_common()
    error: uninitialized symbol 'state'.

regards,
dan carpenter

Re: [PATCH net-next v3 08/11] net/mlx5: devlink health: use retained error fmsg API

[Przemek Kitszel]

On 10/24/23 11:50, Dan Carpenter wrote:
> On Wed, Oct 18, 2023 at 10:26:44PM +0200, Przemek Kitszel wrote:
>>   	if (rq->icosq) {
>>   		struct mlx5e_icosq *icosq = rq->icosq;
>>   		u8 icosq_hw_state;
>>   
>> -		err = mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
>> -		if (err)
>> -			return err;
>> -
>> -		err = mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
>> -		if (err)
>> -			return err;
>> +		mlx5_core_query_sq_state(rq->mdev, icosq->sqn, &icosq_hw_state);
> 
> When we remove the error checking then Smatch correctly complains that
> icosq_hw_state is used uninitialized.
> 
>      drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c:268 mlx5e_rx_reporter_build_diagnose_output_rq_common()
>      error: uninitialized symbol 'icosq_hw_state'.
> 
>> +		mlx5e_reporter_icosq_diagnose(icosq, icosq_hw_state, fmsg);
>>   	}
>>   
>>   	return 0;
>>   }
> 
> See also:
>      drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c:229 mlx5e_tx_reporter_build_diagnose_output_sq_common()
>      error: uninitialized symbol 'state'.
> 
> regards,
> dan carpenter

thank you for the report, I will post a fix soon

[PATCH net-next v3 09/11] qed: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-2 (-2)
---
 drivers/net/ethernet/qlogic/qed/qed_devlink.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_devlink.c b/drivers/net/ethernet/qlogic/qed/qed_devlink.c
index be5cc8b79bd5..dad8e617c393 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_devlink.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_devlink.c
@@ -66,12 +66,12 @@ qed_fw_fatal_reporter_dump(struct devlink_health_reporter *reporter,
 		return err;
 	}
 
-	err = devlink_fmsg_binary_pair_put(fmsg, "dump_data",
-					   p_dbg_data_buf, dbg_data_buf_size);
+	devlink_fmsg_binary_pair_put(fmsg, "dump_data", p_dbg_data_buf,
+				     dbg_data_buf_size);
 
 	vfree(p_dbg_data_buf);
 
-	return err;
+	return 0;
 }
 
 static int
-- 
2.38.1

Re: [PATCH net-next v3 09/11] qed: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:45PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 10/11] staging: qlge: devlink health: use retained error fmsg API

[Przemek Kitszel]

Drop unneeded error checking.

devlink_fmsg_*() family of functions is now retaining errors,
so there is no need to check for them after each call.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
 drivers/staging/qlge/qlge_devlink.c | 60 ++++++++---------------------
 1 file changed, 16 insertions(+), 44 deletions(-)

diff --git a/drivers/staging/qlge/qlge_devlink.c b/drivers/staging/qlge/qlge_devlink.c
index 0ab02d6d3817..0b19363ca2e9 100644
--- a/drivers/staging/qlge/qlge_devlink.c
+++ b/drivers/staging/qlge/qlge_devlink.c
@@ -2,51 +2,29 @@
 #include "qlge.h"
 #include "qlge_devlink.h"
 
-static int qlge_fill_seg_(struct devlink_fmsg *fmsg,
-			  struct mpi_coredump_segment_header *seg_header,
-			  u32 *reg_data)
+static void qlge_fill_seg_(struct devlink_fmsg *fmsg,
+			   struct mpi_coredump_segment_header *seg_header,
+			   u32 *reg_data)
 {
 	int regs_num = (seg_header->seg_size
 			- sizeof(struct mpi_coredump_segment_header)) / sizeof(u32);
-	int err;
 	int i;
 
-	err = devlink_fmsg_pair_nest_start(fmsg, seg_header->description);
-	if (err)
-		return err;
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		return err;
-	err = devlink_fmsg_u32_pair_put(fmsg, "segment", seg_header->seg_num);
-	if (err)
-		return err;
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, "values");
-	if (err)
-		return err;
+	devlink_fmsg_pair_nest_start(fmsg, seg_header->description);
+	devlink_fmsg_obj_nest_start(fmsg);
+	devlink_fmsg_u32_pair_put(fmsg, "segment", seg_header->seg_num);
+	devlink_fmsg_arr_pair_nest_start(fmsg, "values");
 	for (i = 0; i < regs_num; i++) {
-		err = devlink_fmsg_u32_put(fmsg, *reg_data);
-		if (err)
-			return err;
+		devlink_fmsg_u32_put(fmsg, *reg_data);
 		reg_data++;
 	}
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		return err;
-	err = devlink_fmsg_arr_pair_nest_end(fmsg);
-	if (err)
-		return err;
-	err = devlink_fmsg_pair_nest_end(fmsg);
-	return err;
+	devlink_fmsg_obj_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 
-#define FILL_SEG(seg_hdr, seg_regs)			                    \
-	do {                                                                \
-		err = qlge_fill_seg_(fmsg, &dump->seg_hdr, dump->seg_regs); \
-		if (err) {					            \
-			kvfree(dump);                                       \
-			return err;				            \
-		}                                                           \
-	} while (0)
+#define FILL_SEG(seg_hdr, seg_regs) \
+	qlge_fill_seg_(fmsg, &dump->seg_hdr, dump->seg_regs)
 
 static int qlge_reporter_coredump(struct devlink_health_reporter *reporter,
 				  struct devlink_fmsg *fmsg, void *priv_ctx,
@@ -114,14 +92,8 @@ static int qlge_reporter_coredump(struct devlink_health_reporter *reporter,
 	FILL_SEG(xfi_hss_tx_hdr, serdes_xfi_hss_tx);
 	FILL_SEG(xfi_hss_rx_hdr, serdes_xfi_hss_rx);
 	FILL_SEG(xfi_hss_pll_hdr, serdes_xfi_hss_pll);
-
-	err = qlge_fill_seg_(fmsg, &dump->misc_nic_seg_hdr,
-			     (u32 *)&dump->misc_nic_info);
-	if (err) {
-		kvfree(dump);
-		return err;
-	}
-
+	qlge_fill_seg_(fmsg, &dump->misc_nic_seg_hdr,
+		       (u32 *)&dump->misc_nic_info);
 	FILL_SEG(intr_states_seg_hdr, intr_states);
 	FILL_SEG(cam_entries_seg_hdr, cam_entries);
 	FILL_SEG(nic_routing_words_seg_hdr, nic_routing_words);
@@ -140,7 +112,7 @@ static int qlge_reporter_coredump(struct devlink_health_reporter *reporter,
 	FILL_SEG(sem_regs_seg_hdr, sem_regs);
 
 	kvfree(dump);
-	return err;
+	return 0;
 }
 
 static const struct devlink_health_reporter_ops qlge_reporter_ops = {
-- 
2.38.1

Re: [PATCH net-next v3 10/11] staging: qlge: devlink health: use retained error fmsg API

[Simon Horman]

On Wed, Oct 18, 2023 at 10:26:46PM +0200, Przemek Kitszel wrote:
> Drop unneeded error checking.
> 
> devlink_fmsg_*() family of functions is now retaining errors,
> so there is no need to check for them after each call.
> 
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>

[PATCH net-next v3 11/11] devlink: convert most of devlink_fmsg_*() to return void

[Przemek Kitszel]

Since struct devlink_fmsg retains error by now (see 1st patch of this
series), there is no longer need to keep returning it in each call.

This is a separate commit to allow per-driver conversion to stop using
those return values.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
add/remove: 0/0 grow/shrink: 7/12 up/down: 113/-86 (27)
---
 include/net/devlink.h |  60 +++++++-------
 net/devlink/health.c  | 188 +++++++++++++++++++-----------------------
 2 files changed, 114 insertions(+), 134 deletions(-)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index fad8e36e3d98..9ac394bdfbe4 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1854,36 +1854,36 @@ int devlink_info_version_running_put_ext(struct devlink_info_req *req,
 					 const char *version_value,
 					 enum devlink_info_version_type version_type);
 
-int devlink_fmsg_obj_nest_start(struct devlink_fmsg *fmsg);
-int devlink_fmsg_obj_nest_end(struct devlink_fmsg *fmsg);
-
-int devlink_fmsg_pair_nest_start(struct devlink_fmsg *fmsg, const char *name);
-int devlink_fmsg_pair_nest_end(struct devlink_fmsg *fmsg);
-
-int devlink_fmsg_arr_pair_nest_start(struct devlink_fmsg *fmsg,
-				     const char *name);
-int devlink_fmsg_arr_pair_nest_end(struct devlink_fmsg *fmsg);
-int devlink_fmsg_binary_pair_nest_start(struct devlink_fmsg *fmsg,
-					const char *name);
-int devlink_fmsg_binary_pair_nest_end(struct devlink_fmsg *fmsg);
-
-int devlink_fmsg_u32_put(struct devlink_fmsg *fmsg, u32 value);
-int devlink_fmsg_string_put(struct devlink_fmsg *fmsg, const char *value);
-int devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
-			    u16 value_len);
-
-int devlink_fmsg_bool_pair_put(struct devlink_fmsg *fmsg, const char *name,
-			       bool value);
-int devlink_fmsg_u8_pair_put(struct devlink_fmsg *fmsg, const char *name,
-			     u8 value);
-int devlink_fmsg_u32_pair_put(struct devlink_fmsg *fmsg, const char *name,
-			      u32 value);
-int devlink_fmsg_u64_pair_put(struct devlink_fmsg *fmsg, const char *name,
-			      u64 value);
-int devlink_fmsg_string_pair_put(struct devlink_fmsg *fmsg, const char *name,
-				 const char *value);
-int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
-				 const void *value, u32 value_len);
+void devlink_fmsg_obj_nest_start(struct devlink_fmsg *fmsg);
+void devlink_fmsg_obj_nest_end(struct devlink_fmsg *fmsg);
+
+void devlink_fmsg_pair_nest_start(struct devlink_fmsg *fmsg, const char *name);
+void devlink_fmsg_pair_nest_end(struct devlink_fmsg *fmsg);
+
+void devlink_fmsg_arr_pair_nest_start(struct devlink_fmsg *fmsg,
+				      const char *name);
+void devlink_fmsg_arr_pair_nest_end(struct devlink_fmsg *fmsg);
+void devlink_fmsg_binary_pair_nest_start(struct devlink_fmsg *fmsg,
+					 const char *name);
+void devlink_fmsg_binary_pair_nest_end(struct devlink_fmsg *fmsg);
+
+void devlink_fmsg_u32_put(struct devlink_fmsg *fmsg, u32 value);
+void devlink_fmsg_string_put(struct devlink_fmsg *fmsg, const char *value);
+void devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
+			     u16 value_len);
+
+void devlink_fmsg_bool_pair_put(struct devlink_fmsg *fmsg, const char *name,
+				bool value);
+void devlink_fmsg_u8_pair_put(struct devlink_fmsg *fmsg, const char *name,
+			      u8 value);
+void devlink_fmsg_u32_pair_put(struct devlink_fmsg *fmsg, const char *name,
+			       u32 value);
+void devlink_fmsg_u64_pair_put(struct devlink_fmsg *fmsg, const char *name,
+			       u64 value);
+void devlink_fmsg_string_pair_put(struct devlink_fmsg *fmsg, const char *name,
+				  const char *value);
+void devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
+				  const void *value, u32 value_len);
 
 struct devlink_health_reporter *
 devl_port_health_reporter_create(struct devlink_port *port,
diff --git a/net/devlink/health.c b/net/devlink/health.c
index 3858a436598e..89405e59f45c 100644
--- a/net/devlink/health.c
+++ b/net/devlink/health.c
@@ -566,16 +566,15 @@ static int devlink_health_do_dump(struct devlink_health_reporter *reporter,
 	if (!reporter->dump_fmsg)
 		return -ENOMEM;
 
-	err = devlink_fmsg_obj_nest_start(reporter->dump_fmsg);
-	if (err)
-		goto dump_err;
+	devlink_fmsg_obj_nest_start(reporter->dump_fmsg);
 
 	err = reporter->ops->dump(reporter, reporter->dump_fmsg,
 				  priv_ctx, extack);
 	if (err)
 		goto dump_err;
 
-	err = devlink_fmsg_obj_nest_end(reporter->dump_fmsg);
+	devlink_fmsg_obj_nest_end(reporter->dump_fmsg);
+	err = reporter->dump_fmsg->err;
 	if (err)
 		goto dump_err;
 
@@ -675,273 +674,252 @@ static void devlink_fmsg_err_if_binary(struct devlink_fmsg *fmsg)
 		fmsg->err = -EINVAL;
 }
 
-static int devlink_fmsg_nest_common(struct devlink_fmsg *fmsg, int attrtype)
+static void devlink_fmsg_nest_common(struct devlink_fmsg *fmsg, int attrtype)
 {
 	struct devlink_fmsg_item *item;
 
 	if (fmsg->err)
-		return fmsg->err;
+		return;
 
 	item = kzalloc(sizeof(*item), GFP_KERNEL);
 	if (!item) {
 		fmsg->err = -ENOMEM;
-		return fmsg->err;
+		return;
 	}
 
 	item->attrtype = attrtype;
 	list_add_tail(&item->list, &fmsg->item_list);
-
-	return 0;
 }
 
-int devlink_fmsg_obj_nest_start(struct devlink_fmsg *fmsg)
+void devlink_fmsg_obj_nest_start(struct devlink_fmsg *fmsg)
 {
 	devlink_fmsg_err_if_binary(fmsg);
-	return devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_OBJ_NEST_START);
+	devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_OBJ_NEST_START);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_obj_nest_start);
 
-static int devlink_fmsg_nest_end(struct devlink_fmsg *fmsg)
+static void devlink_fmsg_nest_end(struct devlink_fmsg *fmsg)
 {
 	devlink_fmsg_err_if_binary(fmsg);
-	return devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_NEST_END);
+	devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_NEST_END);
 }
 
-int devlink_fmsg_obj_nest_end(struct devlink_fmsg *fmsg)
+void devlink_fmsg_obj_nest_end(struct devlink_fmsg *fmsg)
 {
-	return devlink_fmsg_nest_end(fmsg);
+	devlink_fmsg_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_obj_nest_end);
 
 #define DEVLINK_FMSG_MAX_SIZE (GENLMSG_DEFAULT_SIZE - GENL_HDRLEN - NLA_HDRLEN)
 
-static int devlink_fmsg_put_name(struct devlink_fmsg *fmsg, const char *name)
+static void devlink_fmsg_put_name(struct devlink_fmsg *fmsg, const char *name)
 {
 	struct devlink_fmsg_item *item;
 
 	devlink_fmsg_err_if_binary(fmsg);
 	if (fmsg->err)
-		return fmsg->err;
+		return;
 
 	if (strlen(name) + 1 > DEVLINK_FMSG_MAX_SIZE) {
 		fmsg->err = -EMSGSIZE;
-		return fmsg->err;
+		return;
 	}
 
 	item = kzalloc(sizeof(*item) + strlen(name) + 1, GFP_KERNEL);
 	if (!item) {
 		fmsg->err = -ENOMEM;
-		return fmsg->err;
+		return;
 	}
 
 	item->nla_type = NLA_NUL_STRING;
 	item->len = strlen(name) + 1;
 	item->attrtype = DEVLINK_ATTR_FMSG_OBJ_NAME;
 	memcpy(&item->value, name, item->len);
 	list_add_tail(&item->list, &fmsg->item_list);
-
-	return 0;
 }
 
-int devlink_fmsg_pair_nest_start(struct devlink_fmsg *fmsg, const char *name)
+void devlink_fmsg_pair_nest_start(struct devlink_fmsg *fmsg, const char *name)
 {
 	devlink_fmsg_err_if_binary(fmsg);
 	devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_PAIR_NEST_START);
-	return devlink_fmsg_put_name(fmsg, name);
+	devlink_fmsg_put_name(fmsg, name);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_pair_nest_start);
 
-int devlink_fmsg_pair_nest_end(struct devlink_fmsg *fmsg)
+void devlink_fmsg_pair_nest_end(struct devlink_fmsg *fmsg)
 {
-	return devlink_fmsg_nest_end(fmsg);
+	devlink_fmsg_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_pair_nest_end);
 
-int devlink_fmsg_arr_pair_nest_start(struct devlink_fmsg *fmsg,
-				     const char *name)
+void devlink_fmsg_arr_pair_nest_start(struct devlink_fmsg *fmsg,
+				      const char *name)
 {
 	devlink_fmsg_pair_nest_start(fmsg, name);
-	return devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_ARR_NEST_START);
+	devlink_fmsg_nest_common(fmsg, DEVLINK_ATTR_FMSG_ARR_NEST_START);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_arr_pair_nest_start);
 
-int devlink_fmsg_arr_pair_nest_end(struct devlink_fmsg *fmsg)
+void devlink_fmsg_arr_pair_nest_end(struct devlink_fmsg *fmsg)
 {
 	devlink_fmsg_nest_end(fmsg);
-	return devlink_fmsg_nest_end(fmsg);
+	devlink_fmsg_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_arr_pair_nest_end);
 
-int devlink_fmsg_binary_pair_nest_start(struct devlink_fmsg *fmsg,
-					const char *name)
+void devlink_fmsg_binary_pair_nest_start(struct devlink_fmsg *fmsg,
+					 const char *name)
 {
-	int err;
-
-	err = devlink_fmsg_arr_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
-
+	devlink_fmsg_arr_pair_nest_start(fmsg, name);
 	fmsg->putting_binary = true;
-	return 0;
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_binary_pair_nest_start);
 
-int devlink_fmsg_binary_pair_nest_end(struct devlink_fmsg *fmsg)
+void devlink_fmsg_binary_pair_nest_end(struct devlink_fmsg *fmsg)
 {
 	if (fmsg->err)
-		return fmsg->err;
+		return;
 
-	if (!fmsg->putting_binary) {
+	if (!fmsg->putting_binary)
 		fmsg->err = -EINVAL;
-		return fmsg->err;
-	}
 
 	fmsg->putting_binary = false;
-	return devlink_fmsg_arr_pair_nest_end(fmsg);
+	devlink_fmsg_arr_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_binary_pair_nest_end);
 
-static int devlink_fmsg_put_value(struct devlink_fmsg *fmsg,
-				  const void *value, u16 value_len,
-				  u8 value_nla_type)
+static void devlink_fmsg_put_value(struct devlink_fmsg *fmsg,
+				   const void *value, u16 value_len,
+				   u8 value_nla_type)
 {
 	struct devlink_fmsg_item *item;
 
+	if (fmsg->err)
+		return;
+
 	if (value_len > DEVLINK_FMSG_MAX_SIZE) {
 		fmsg->err = -EMSGSIZE;
-		return fmsg->err;
+		return;
 	}
 
 	item = kzalloc(sizeof(*item) + value_len, GFP_KERNEL);
 	if (!item) {
 		fmsg->err = -ENOMEM;
-		return fmsg->err;
+		return;
 	}
 
 	item->nla_type = value_nla_type;
 	item->len = value_len;
 	item->attrtype = DEVLINK_ATTR_FMSG_OBJ_VALUE_DATA;
 	memcpy(&item->value, value, item->len);
 	list_add_tail(&item->list, &fmsg->item_list);
-
-	return 0;
 }
 
-static int devlink_fmsg_bool_put(struct devlink_fmsg *fmsg, bool value)
+static void devlink_fmsg_bool_put(struct devlink_fmsg *fmsg, bool value)
 {
 	devlink_fmsg_err_if_binary(fmsg);
-	return devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_FLAG);
+	devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_FLAG);
 }
 
-static int devlink_fmsg_u8_put(struct devlink_fmsg *fmsg, u8 value)
+static void devlink_fmsg_u8_put(struct devlink_fmsg *fmsg, u8 value)
 {
 	devlink_fmsg_err_if_binary(fmsg);
-	return devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U8);
+	devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U8);
 }
 
-int devlink_fmsg_u32_put(struct devlink_fmsg *fmsg, u32 value)
+void devlink_fmsg_u32_put(struct devlink_fmsg *fmsg, u32 value)
 {
 	devlink_fmsg_err_if_binary(fmsg);
-	return devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U32);
+	devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U32);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_u32_put);
 
-static int devlink_fmsg_u64_put(struct devlink_fmsg *fmsg, u64 value)
+static void devlink_fmsg_u64_put(struct devlink_fmsg *fmsg, u64 value)
 {
 	devlink_fmsg_err_if_binary(fmsg);
-	return devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U64);
+	devlink_fmsg_put_value(fmsg, &value, sizeof(value), NLA_U64);
 }
 
-int devlink_fmsg_string_put(struct devlink_fmsg *fmsg, const char *value)
+void devlink_fmsg_string_put(struct devlink_fmsg *fmsg, const char *value)
 {
 	devlink_fmsg_err_if_binary(fmsg);
-	return devlink_fmsg_put_value(fmsg, value, strlen(value) + 1,
-				      NLA_NUL_STRING);
+	devlink_fmsg_put_value(fmsg, value, strlen(value) + 1, NLA_NUL_STRING);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_string_put);
 
-int devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
-			    u16 value_len)
+void devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
+			     u16 value_len)
 {
-	if (!fmsg->putting_binary)
-		return -EINVAL;
+	if (!fmsg->err && !fmsg->putting_binary)
+		fmsg->err = -EINVAL;
 
-	return devlink_fmsg_put_value(fmsg, value, value_len, NLA_BINARY);
+	devlink_fmsg_put_value(fmsg, value, value_len, NLA_BINARY);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_binary_put);
 
-int devlink_fmsg_bool_pair_put(struct devlink_fmsg *fmsg, const char *name,
-			       bool value)
+void devlink_fmsg_bool_pair_put(struct devlink_fmsg *fmsg, const char *name,
+				bool value)
 {
 	devlink_fmsg_pair_nest_start(fmsg, name);
 	devlink_fmsg_bool_put(fmsg, value);
-	return devlink_fmsg_pair_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_bool_pair_put);
 
-int devlink_fmsg_u8_pair_put(struct devlink_fmsg *fmsg, const char *name,
-			     u8 value)
+void devlink_fmsg_u8_pair_put(struct devlink_fmsg *fmsg, const char *name,
+			      u8 value)
 {
 	devlink_fmsg_pair_nest_start(fmsg, name);
 	devlink_fmsg_u8_put(fmsg, value);
-	return devlink_fmsg_pair_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_u8_pair_put);
 
-int devlink_fmsg_u32_pair_put(struct devlink_fmsg *fmsg, const char *name,
-			      u32 value)
+void devlink_fmsg_u32_pair_put(struct devlink_fmsg *fmsg, const char *name,
+			       u32 value)
 {
 	devlink_fmsg_pair_nest_start(fmsg, name);
 	devlink_fmsg_u32_put(fmsg, value);
-	return devlink_fmsg_pair_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_u32_pair_put);
 
-int devlink_fmsg_u64_pair_put(struct devlink_fmsg *fmsg, const char *name,
-			      u64 value)
+void devlink_fmsg_u64_pair_put(struct devlink_fmsg *fmsg, const char *name,
+			       u64 value)
 {
 	devlink_fmsg_pair_nest_start(fmsg, name);
 	devlink_fmsg_u64_put(fmsg, value);
-	return devlink_fmsg_pair_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_u64_pair_put);
 
-int devlink_fmsg_string_pair_put(struct devlink_fmsg *fmsg, const char *name,
-				 const char *value)
+void devlink_fmsg_string_pair_put(struct devlink_fmsg *fmsg, const char *name,
+				  const char *value)
 {
 	devlink_fmsg_pair_nest_start(fmsg, name);
 	devlink_fmsg_string_put(fmsg, value);
-	return devlink_fmsg_pair_nest_end(fmsg);
+	devlink_fmsg_pair_nest_end(fmsg);
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_string_pair_put);
 
-int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
-				 const void *value, u32 value_len)
+void devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
+				  const void *value, u32 value_len)
 {
 	u32 data_size;
 	u32 offset;
-	int err;
 
-	err = devlink_fmsg_binary_pair_nest_start(fmsg, name);
-	if (err)
-		return err;
+	devlink_fmsg_binary_pair_nest_start(fmsg, name);
 
 	for (offset = 0; offset < value_len; offset += data_size) {
 		data_size = value_len - offset;
 		if (data_size > DEVLINK_FMSG_MAX_SIZE)
 			data_size = DEVLINK_FMSG_MAX_SIZE;
-		err = devlink_fmsg_binary_put(fmsg, value + offset, data_size);
-		if (err)
-			break;
-		/* Exit from loop with a break (instead of
-		 * return) to make sure putting_binary is turned off
-		 */
+
+		devlink_fmsg_binary_put(fmsg, value + offset, data_size);
 	}
 
-	err = devlink_fmsg_binary_pair_nest_end(fmsg);
+	devlink_fmsg_binary_pair_nest_end(fmsg);
 	fmsg->putting_binary = false;
-
-	return err;
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_binary_pair_put);
 
@@ -1051,6 +1029,9 @@ static int devlink_fmsg_snd(struct devlink_fmsg *fmsg,
 	void *hdr;
 	int err;
 
+	if (fmsg->err)
+		return fmsg->err;
+
 	while (!last) {
 		int tmp_index = index;
 
@@ -1104,6 +1085,9 @@ static int devlink_fmsg_dumpit(struct devlink_fmsg *fmsg, struct sk_buff *skb,
 	void *hdr;
 	int err;
 
+	if (fmsg->err)
+		return fmsg->err;
+
 	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 			  &devlink_nl_family, NLM_F_ACK | NLM_F_MULTI, cmd);
 	if (!hdr) {
@@ -1143,17 +1127,13 @@ int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
 	if (!fmsg)
 		return -ENOMEM;
 
-	err = devlink_fmsg_obj_nest_start(fmsg);
-	if (err)
-		goto out;
+	devlink_fmsg_obj_nest_start(fmsg);
 
 	err = reporter->ops->diagnose(reporter, fmsg, info->extack);
 	if (err)
 		goto out;
 
-	err = devlink_fmsg_obj_nest_end(fmsg);
-	if (err)
-		goto out;
+	devlink_fmsg_obj_nest_end(fmsg);
 
 	err = devlink_fmsg_snd(fmsg, info,
 			       DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE, 0);
-- 
2.38.1

Re: [PATCH net-next v3 00/11] devlink: retain error in struct devlink_fmsg

[Jiri Pirko]

Wed, Oct 18, 2023 at 10:26:36PM CEST, przemyslaw.kitszel@intel.com wrote:
>Extend devlink fmsg to retain error (patch 1),
>so drivers could omit error checks after devlink_fmsg_*() (patches 2-10),
>and finally enforce future uses to follow this practice by change to
>return void (patch 11)
>
>Note that it was compile tested only.
>
>bloat-o-meter for whole series:
>add/remove: 8/18 grow/shrink: 23/40 up/down: 2017/-5833 (-3816)
>
>changelog:
>v3: set err to correct value, thanks to Simon and smatch
>    (mlx5 patch, final patch);

2 nits:
- always better to have per-patch changelog so it is clear for the
  reviewers what exactly did you change and where.
- if you do any change in a patch, you should drop the
  acked/reviewed/signedoff tags and get them again from people.

that being said:
set-
Reviewed-by: Jiri Pirko <jiri@nvidia.com>

Re: [PATCH net-next v3 00/11] devlink: retain error in struct devlink_fmsg

[Przemek Kitszel]

On 10/19/23 15:44, Jiri Pirko wrote:
> Wed, Oct 18, 2023 at 10:26:36PM CEST, przemyslaw.kitszel@intel.com wrote:
>> Extend devlink fmsg to retain error (patch 1),
>> so drivers could omit error checks after devlink_fmsg_*() (patches 2-10),
>> and finally enforce future uses to follow this practice by change to
>> return void (patch 11)
>>
>> Note that it was compile tested only.
>>
>> bloat-o-meter for whole series:
>> add/remove: 8/18 grow/shrink: 23/40 up/down: 2017/-5833 (-3816)
>>
>> changelog:
>> v3: set err to correct value, thanks to Simon and smatch
>>     (mlx5 patch, final patch);
> 
> 2 nits:
> - always better to have per-patch changelog so it is clear for the
>    reviewers what exactly did you change and where.

agree that adding changelog also to patches would be better

> - if you do any change in a patch, you should drop the
>    acked/reviewed/signedoff tags and get them again from people.

Here opinions differ widely, and my understanding was "it depends".
Noted to always drop yours.

On one side you have just rebased patches (different context of review),
then with trivial conflict fixed, then with minor change (as here,
0-init to retval, those are things that I believe most reviewers don't
want to look again at.
Then patches with some improvement that somebody suggested (as reviewer,
I want to see what could have been done better and I didn't notice).

In the above cases there is both time to react and no much harm keeping
RB. Things I think that most reviewers and maintainers would like to
drop RB start at "significant changes such as 'business' logic change",
which is of course a fuzzy line.

Always dropping is an easy solution, perhaps too easy ;)

> 
> that being said:
> set-
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> 

Thank you!

Re: [PATCH net-next v3 00/11] devlink: retain error in struct devlink_fmsg

[Jiri Pirko]

Thu, Oct 19, 2023 at 11:50:03PM CEST, przemyslaw.kitszel@intel.com wrote:
>On 10/19/23 15:44, Jiri Pirko wrote:
>> Wed, Oct 18, 2023 at 10:26:36PM CEST, przemyslaw.kitszel@intel.com wrote:
>> > Extend devlink fmsg to retain error (patch 1),
>> > so drivers could omit error checks after devlink_fmsg_*() (patches 2-10),
>> > and finally enforce future uses to follow this practice by change to
>> > return void (patch 11)
>> > 
>> > Note that it was compile tested only.
>> > 
>> > bloat-o-meter for whole series:
>> > add/remove: 8/18 grow/shrink: 23/40 up/down: 2017/-5833 (-3816)
>> > 
>> > changelog:
>> > v3: set err to correct value, thanks to Simon and smatch
>> >     (mlx5 patch, final patch);
>> 
>> 2 nits:
>> - always better to have per-patch changelog so it is clear for the
>>    reviewers what exactly did you change and where.
>
>agree that adding changelog also to patches would be better
>
>> - if you do any change in a patch, you should drop the
>>    acked/reviewed/signedoff tags and get them again from people.
>
>Here opinions differ widely, and my understanding was "it depends".
>Noted to always drop yours.
>
>On one side you have just rebased patches (different context of review),
>then with trivial conflict fixed, then with minor change (as here,
>0-init to retval, those are things that I believe most reviewers don't
>want to look again at.
>Then patches with some improvement that somebody suggested (as reviewer,
>I want to see what could have been done better and I didn't notice).
>
>In the above cases there is both time to react and no much harm keeping
>RB. Things I think that most reviewers and maintainers would like to
>drop RB start at "significant changes such as 'business' logic change",
>which is of course a fuzzy line.
>
>Always dropping is an easy solution, perhaps too easy ;)

Quoting Documentation/process/submitting-patches.rst:
"
Both Tested-by and Reviewed-by tags, once received on mailing list from tester
or reviewer, should be added by author to the applicable patches when sending
next versions.  However if the patch has changed substantially in following
version, these tags might not be applicable anymore and thus should be removed.
Usually removal of someone's Tested-by or Reviewed-by tags should be mentioned
in the patch changelog (after the '---' separator).
"

I guess that in this case you are right, it the change is not likely
"substantial".

Thanks!



>
>> 
>> that being said:
>> set-
>> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
>> 
>
>Thank you!

Re: [PATCH net-next v3 00/11] devlink: retain error in struct devlink_fmsg

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by David S. Miller <davem@davemloft.net>:

On Wed, 18 Oct 2023 22:26:36 +0200 you wrote:
> Extend devlink fmsg to retain error (patch 1),
> so drivers could omit error checks after devlink_fmsg_*() (patches 2-10),
> and finally enforce future uses to follow this practice by change to
> return void (patch 11)
> 
> Note that it was compile tested only.
> 
> [...]

Here is the summary with links:
  - [net-next,v3,01/11] devlink: retain error in struct devlink_fmsg
    (no matching commit)
  - [net-next,v3,02/11] netdevsim: devlink health: use retained error fmsg API
    (no matching commit)
  - [net-next,v3,03/11] pds_core: devlink health: use retained error fmsg API
    https://git.kernel.org/netdev/net-next/c/47957bb3f783
  - [net-next,v3,04/11] bnxt_en: devlink health: use retained error fmsg API
    (no matching commit)
  - [net-next,v3,05/11] hinic: devlink health: use retained error fmsg API
    (no matching commit)
  - [net-next,v3,06/11] octeontx2-af: devlink health: use retained error fmsg API
    https://git.kernel.org/netdev/net-next/c/d8cf03fca341
  - [net-next,v3,07/11] mlxsw: core: devlink health: use retained error fmsg API
    https://git.kernel.org/netdev/net-next/c/1d434b48495d
  - [net-next,v3,08/11] net/mlx5: devlink health: use retained error fmsg API
    (no matching commit)
  - [net-next,v3,09/11] qed: devlink health: use retained error fmsg API
    https://git.kernel.org/netdev/net-next/c/18256cb2d4a0
  - [net-next,v3,10/11] staging: qlge: devlink health: use retained error fmsg API
    https://git.kernel.org/netdev/net-next/c/3465915e9985
  - [net-next,v3,11/11] devlink: convert most of devlink_fmsg_*() to return void
    (no matching commit)

You are awesome, thank you!
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