[net-next 00/11] nfp: implement firmware loading policy

[net-next 00/11] nfp: implement firmware loading policy

[Simon Horman]

Hi Dave,

I am handling maintenance of the nfp diver in Jakub's absence while he is
on vacation this week and next, and I am sending this patchset in that
capacity.

Regarding the patches, Dirk says:

This series adds configuration capabilities to the firmware loading policy of
the NFP driver.

NFP firmware loading is controlled via three HWinfo keys which can be set per
device: 'abi_drv_reset', 'abi_drv_load_ifc' and 'app_fw_from_flash'.
Refer to patch #11 for more detail on how these control the firmware loading.

In order to configure the full extend of FW loading policy, a new devlink
parameter has been introduced, 'reset_dev_on_drv_probe', which controls if the
driver should reset the device when it's probed. This, inconjunction with the
existing 'fw_load_policy' (extended to include a 'disk' option) provides the
means to tweak the NFP HWinfo keys as required by users.

Patches 1 and 2 adds the devlink modifications and patches 3 through 9 adds the
support into the NFP driver. Furthermore, the last 2 patches are documentation
only.

Dirk van der Merwe (11):
  devlink: extend 'fw_load_policy' values
  devlink: add 'reset_dev_on_drv_probe' param
  nfp: nsp: add support for fw_loaded command
  nfp: nsp: add support for optional hwinfo lookup
  nfp: nsp: add support for hwinfo set operation
  nfp: honor FW reset and loading policies
  nfp: add devlink param infrastructure
  nfp: devlink: add 'fw_load_policy' support
  nfp: devlink: add 'reset_dev_on_drv_probe' support
  kdoc: fix nfp_fw_load documentation
  Documentation: nfp: add nfp driver specific notes

 .../networking/device_drivers/netronome/nfp.rst    | 133 +++++++++++
 Documentation/networking/devlink-params-nfp.txt    |   5 +
 Documentation/networking/devlink-params.txt        |  16 ++
 drivers/net/ethernet/netronome/nfp/Makefile        |   1 +
 drivers/net/ethernet/netronome/nfp/devlink_param.c | 253 +++++++++++++++++++++
 drivers/net/ethernet/netronome/nfp/nfp_main.c      | 141 +++++++++---
 drivers/net/ethernet/netronome/nfp/nfp_main.h      |   5 +
 drivers/net/ethernet/netronome/nfp/nfp_net_main.c  |   7 +
 .../net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c   |  77 ++++++-
 .../net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h   |  29 +++
 include/net/devlink.h                              |   4 +
 include/uapi/linux/devlink.h                       |   8 +
 net/core/devlink.c                                 |   5 +
 13 files changed, 654 insertions(+), 30 deletions(-)
 create mode 100644 Documentation/networking/device_drivers/netronome/nfp.rst
 create mode 100644 Documentation/networking/devlink-params-nfp.txt
 create mode 100644 drivers/net/ethernet/netronome/nfp/devlink_param.c

-- 
2.11.0

[net-next 01/11] devlink: extend 'fw_load_policy' values

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Add the 'disk' value to the generic 'fw_load_policy' devlink parameter.
This value indicates that firmware should always be loaded from disk
only.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 Documentation/networking/devlink-params.txt | 2 ++
 include/uapi/linux/devlink.h                | 1 +
 2 files changed, 3 insertions(+)

diff --git a/Documentation/networking/devlink-params.txt b/Documentation/networking/devlink-params.txt
index 2d26434ddcf8..fadb5436188d 100644
--- a/Documentation/networking/devlink-params.txt
+++ b/Documentation/networking/devlink-params.txt
@@ -48,4 +48,6 @@ fw_load_policy		[DEVICE, GENERIC]
 			  Load firmware version preferred by the driver.
 			* DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_FLASH (1)
 			  Load firmware currently stored in flash.
+			* DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK (2)
+			  Load firmware currently available on host's disk.
 			Type: u8
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 546e75dd74ac..c25cc29a6647 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -202,6 +202,7 @@ enum devlink_param_cmode {
 enum devlink_param_fw_load_policy_value {
 	DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DRIVER,
 	DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_FLASH,
+	DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK,
 };
 
 enum {
-- 
2.11.0

[net-next 02/11] devlink: add 'reset_dev_on_drv_probe' param

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Add the 'reset_dev_on_drv_probe' devlink parameter, controlling the
device reset policy on driver probe.

This parameter is useful in conjunction with the existing
'fw_load_policy' parameter.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 Documentation/networking/devlink-params.txt | 14 ++++++++++++++
 include/net/devlink.h                       |  4 ++++
 include/uapi/linux/devlink.h                |  7 +++++++
 net/core/devlink.c                          |  5 +++++
 4 files changed, 30 insertions(+)

diff --git a/Documentation/networking/devlink-params.txt b/Documentation/networking/devlink-params.txt
index fadb5436188d..f9e30d686243 100644
--- a/Documentation/networking/devlink-params.txt
+++ b/Documentation/networking/devlink-params.txt
@@ -51,3 +51,17 @@ fw_load_policy		[DEVICE, GENERIC]
 			* DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK (2)
 			  Load firmware currently available on host's disk.
 			Type: u8
+
+reset_dev_on_drv_probe	[DEVICE, GENERIC]
+			Controls the device's reset policy on driver probe.
+			Valid values:
+			* DEVLINK_PARAM_RESET_DEV_VALUE_UNKNOWN (0)
+			  Unknown or invalid value.
+			* DEVLINK_PARAM_RESET_DEV_VALUE_ALWAYS (1)
+			  Always reset device on driver probe.
+			* DEVLINK_PARAM_RESET_DEV_VALUE_NEVER (2)
+			  Never reset device on driver probe.
+			* DEVLINK_PARAM_RESET_DEV_VALUE_DISK (3)
+			  Reset only if device firmware can be found in the
+			  filesystem.
+			Type: u8
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 460bc629d1a4..d880de5b8d3a 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -398,6 +398,7 @@ enum devlink_param_generic_id {
 	DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX,
 	DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN,
 	DEVLINK_PARAM_GENERIC_ID_FW_LOAD_POLICY,
+	DEVLINK_PARAM_GENERIC_ID_RESET_DEV,
 
 	/* add new param generic ids above here*/
 	__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -428,6 +429,9 @@ enum devlink_param_generic_id {
 #define DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_NAME "fw_load_policy"
 #define DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_TYPE DEVLINK_PARAM_TYPE_U8
 
+#define DEVLINK_PARAM_GENERIC_RESET_DEV_NAME "reset_dev_on_drv_probe"
+#define DEVLINK_PARAM_GENERIC_RESET_DEV_TYPE DEVLINK_PARAM_TYPE_U8
+
 #define DEVLINK_PARAM_GENERIC(_id, _cmodes, _get, _set, _validate)	\
 {									\
 	.id = DEVLINK_PARAM_GENERIC_ID_##_id,				\
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index c25cc29a6647..3172d1b3329f 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -205,6 +205,13 @@ enum devlink_param_fw_load_policy_value {
 	DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK,
 };
 
+enum devlink_param_reset_dev_value {
+	DEVLINK_PARAM_RESET_DEV_VALUE_UNKNOWN,
+	DEVLINK_PARAM_RESET_DEV_VALUE_ALWAYS,
+	DEVLINK_PARAM_RESET_DEV_VALUE_NEVER,
+	DEVLINK_PARAM_RESET_DEV_VALUE_DISK,
+};
+
 enum {
 	DEVLINK_ATTR_STATS_RX_PACKETS,		/* u64 */
 	DEVLINK_ATTR_STATS_RX_BYTES,		/* u64 */
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 6e52d639dac6..e8bc96f104a7 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -2852,6 +2852,11 @@ static const struct devlink_param devlink_param_generic[] = {
 		.name = DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_NAME,
 		.type = DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_TYPE,
 	},
+	{
+		.id = DEVLINK_PARAM_GENERIC_ID_RESET_DEV,
+		.name = DEVLINK_PARAM_GENERIC_RESET_DEV_NAME,
+		.type = DEVLINK_PARAM_GENERIC_RESET_DEV_TYPE,
+	},
 };
 
 static int devlink_param_generic_verify(const struct devlink_param *param)
-- 
2.11.0

[net-next 03/11] nfp: nsp: add support for fw_loaded command

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Add support for the simple command that indicates whether application
firmware is loaded.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c | 10 ++++++++++
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
index 9a08623c325d..b4c5dc5f7404 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -96,6 +96,7 @@ enum nfp_nsp_cmd {
 	SPCODE_NSP_IDENTIFY	= 13, /* Read NSP version */
 	SPCODE_FW_STORED	= 16, /* If no FW loaded, load flash app FW */
 	SPCODE_HWINFO_LOOKUP	= 17, /* Lookup HWinfo with overwrites etc. */
+	SPCODE_FW_LOADED	= 19, /* Is application firmware loaded */
 	SPCODE_VERSIONS		= 21, /* Report FW versions */
 	SPCODE_READ_SFF_EEPROM	= 22, /* Read module EEPROM */
 };
@@ -925,6 +926,15 @@ int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size)
 	return 0;
 }
 
+int nfp_nsp_fw_loaded(struct nfp_nsp *state)
+{
+	const struct nfp_nsp_command_arg arg = {
+		.code		= SPCODE_FW_LOADED,
+	};
+
+	return __nfp_nsp_command(state, &arg);
+}
+
 int nfp_nsp_versions(struct nfp_nsp *state, void *buf, unsigned int size)
 {
 	struct nfp_nsp_command_buf_arg versions = {
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
index 22ee6985ee1c..4ceecff347c6 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
@@ -22,6 +22,7 @@ int nfp_nsp_write_flash(struct nfp_nsp *state, const struct firmware *fw);
 int nfp_nsp_mac_reinit(struct nfp_nsp *state);
 int nfp_nsp_load_stored_fw(struct nfp_nsp *state);
 int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size);
+int nfp_nsp_fw_loaded(struct nfp_nsp *state);
 int nfp_nsp_read_module_eeprom(struct nfp_nsp *state, int eth_index,
 			       unsigned int offset, void *data,
 			       unsigned int len, unsigned int *read_len);
@@ -41,6 +42,11 @@ static inline bool nfp_nsp_has_hwinfo_lookup(struct nfp_nsp *state)
 	return nfp_nsp_get_abi_ver_minor(state) > 24;
 }
 
+static inline bool nfp_nsp_has_fw_loaded(struct nfp_nsp *state)
+{
+	return nfp_nsp_get_abi_ver_minor(state) > 25;
+}
+
 static inline bool nfp_nsp_has_versions(struct nfp_nsp *state)
 {
 	return nfp_nsp_get_abi_ver_minor(state) > 27;
-- 
2.11.0

[net-next 04/11] nfp: nsp: add support for optional hwinfo lookup

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

There are cases where we want to read a hwinfo entry from the NFP, and
if it doesn't exist, use a default value instead.

To support this, we must silence warning/error messages when the hwinfo
entry doesn't exist since this is a valid use case. The NSP command
structure provides the ability to silence command errors, in which case
the caller should log any command errors appropriately. Protocol errors
are unaffected by this.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c   | 52 ++++++++++++++++++++--
 .../net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h   |  2 +
 2 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
index b4c5dc5f7404..deee91cbf1b2 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -144,6 +144,8 @@ struct nfp_nsp {
  * @option:	NFP SP Command Argument
  * @buf:	NFP SP Buffer Address
  * @error_cb:	Callback for interpreting option if error occurred
+ * @error_quiet:Don't print command error/warning. Protocol errors are still
+ *		    logged.
  */
 struct nfp_nsp_command_arg {
 	u16 code;
@@ -152,6 +154,7 @@ struct nfp_nsp_command_arg {
 	u32 option;
 	u64 buf;
 	void (*error_cb)(struct nfp_nsp *state, u32 ret_val);
+	bool error_quiet;
 };
 
 /**
@@ -406,8 +409,10 @@ __nfp_nsp_command(struct nfp_nsp *state, const struct nfp_nsp_command_arg *arg)
 
 	err = FIELD_GET(NSP_STATUS_RESULT, reg);
 	if (err) {
-		nfp_warn(cpp, "Result (error) code set: %d (%d) command: %d\n",
-			 -err, (int)ret_val, arg->code);
+		if (!arg->error_quiet)
+			nfp_warn(cpp, "Result (error) code set: %d (%d) command: %d\n",
+				 -err, (int)ret_val, arg->code);
+
 		if (arg->error_cb)
 			arg->error_cb(state, ret_val);
 		else
@@ -892,12 +897,14 @@ int nfp_nsp_load_stored_fw(struct nfp_nsp *state)
 }
 
 static int
-__nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size)
+__nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size,
+			bool optional)
 {
 	struct nfp_nsp_command_buf_arg hwinfo_lookup = {
 		{
 			.code		= SPCODE_HWINFO_LOOKUP,
 			.option		= size,
+			.error_quiet	= optional,
 		},
 		.in_buf		= buf,
 		.in_size	= size,
@@ -914,7 +921,7 @@ int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size)
 
 	size = min_t(u32, size, NFP_HWINFO_LOOKUP_SIZE);
 
-	err = __nfp_nsp_hwinfo_lookup(state, buf, size);
+	err = __nfp_nsp_hwinfo_lookup(state, buf, size, false);
 	if (err)
 		return err;
 
@@ -926,6 +933,43 @@ int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size)
 	return 0;
 }
 
+int nfp_nsp_hwinfo_lookup_optional(struct nfp_nsp *state, void *buf,
+				   unsigned int size, const char *default_val)
+{
+	int err;
+
+	/* Ensure that the default value is usable irrespective of whether
+	 * it is actually going to be used.
+	 */
+	if (strnlen(default_val, size) == size)
+		return -EINVAL;
+
+	if (!nfp_nsp_has_hwinfo_lookup(state)) {
+		strcpy(buf, default_val);
+		return 0;
+	}
+
+	size = min_t(u32, size, NFP_HWINFO_LOOKUP_SIZE);
+
+	err = __nfp_nsp_hwinfo_lookup(state, buf, size, true);
+	if (err) {
+		if (err == -ENOENT) {
+			strcpy(buf, default_val);
+			return 0;
+		}
+
+		nfp_err(state->cpp, "NSP HWinfo lookup failed: %d\n", err);
+		return err;
+	}
+
+	if (strnlen(buf, size) == size) {
+		nfp_err(state->cpp, "NSP HWinfo value not NULL-terminated\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 int nfp_nsp_fw_loaded(struct nfp_nsp *state)
 {
 	const struct nfp_nsp_command_arg arg = {
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
index 4ceecff347c6..a8985c2eb1f1 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
@@ -22,6 +22,8 @@ int nfp_nsp_write_flash(struct nfp_nsp *state, const struct firmware *fw);
 int nfp_nsp_mac_reinit(struct nfp_nsp *state);
 int nfp_nsp_load_stored_fw(struct nfp_nsp *state);
 int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size);
+int nfp_nsp_hwinfo_lookup_optional(struct nfp_nsp *state, void *buf,
+				   unsigned int size, const char *default_val);
 int nfp_nsp_fw_loaded(struct nfp_nsp *state);
 int nfp_nsp_read_module_eeprom(struct nfp_nsp *state, int eth_index,
 			       unsigned int offset, void *data,
-- 
2.11.0

[net-next 05/11] nfp: nsp: add support for hwinfo set operation

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Add support for the NSP HWinfo set command. This closely follows the
HWinfo lookup command.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c | 15 +++++++++++++++
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h |  6 ++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
index deee91cbf1b2..f18e787fa9ad 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -96,6 +96,7 @@ enum nfp_nsp_cmd {
 	SPCODE_NSP_IDENTIFY	= 13, /* Read NSP version */
 	SPCODE_FW_STORED	= 16, /* If no FW loaded, load flash app FW */
 	SPCODE_HWINFO_LOOKUP	= 17, /* Lookup HWinfo with overwrites etc. */
+	SPCODE_HWINFO_SET	= 18, /* Set HWinfo entry */
 	SPCODE_FW_LOADED	= 19, /* Is application firmware loaded */
 	SPCODE_VERSIONS		= 21, /* Report FW versions */
 	SPCODE_READ_SFF_EEPROM	= 22, /* Read module EEPROM */
@@ -970,6 +971,20 @@ int nfp_nsp_hwinfo_lookup_optional(struct nfp_nsp *state, void *buf,
 	return 0;
 }
 
+int nfp_nsp_hwinfo_set(struct nfp_nsp *state, void *buf, unsigned int size)
+{
+	struct nfp_nsp_command_buf_arg hwinfo_set = {
+		{
+			.code		= SPCODE_HWINFO_SET,
+			.option		= size,
+		},
+		.in_buf		= buf,
+		.in_size	= size,
+	};
+
+	return nfp_nsp_command_buf(state, &hwinfo_set);
+}
+
 int nfp_nsp_fw_loaded(struct nfp_nsp *state)
 {
 	const struct nfp_nsp_command_arg arg = {
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
index a8985c2eb1f1..055fda05880d 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
@@ -24,6 +24,7 @@ int nfp_nsp_load_stored_fw(struct nfp_nsp *state);
 int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size);
 int nfp_nsp_hwinfo_lookup_optional(struct nfp_nsp *state, void *buf,
 				   unsigned int size, const char *default_val);
+int nfp_nsp_hwinfo_set(struct nfp_nsp *state, void *buf, unsigned int size);
 int nfp_nsp_fw_loaded(struct nfp_nsp *state);
 int nfp_nsp_read_module_eeprom(struct nfp_nsp *state, int eth_index,
 			       unsigned int offset, void *data,
@@ -44,6 +45,11 @@ static inline bool nfp_nsp_has_hwinfo_lookup(struct nfp_nsp *state)
 	return nfp_nsp_get_abi_ver_minor(state) > 24;
 }
 
+static inline bool nfp_nsp_has_hwinfo_set(struct nfp_nsp *state)
+{
+	return nfp_nsp_get_abi_ver_minor(state) > 25;
+}
+
 static inline bool nfp_nsp_has_fw_loaded(struct nfp_nsp *state)
 {
 	return nfp_nsp_get_abi_ver_minor(state) > 25;
-- 
2.11.0

[net-next 06/11] nfp: honor FW reset and loading policies

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

The firmware reset and loading policies can be controlled with the
combination of three hwinfo keys, 'abi_drv_reset', 'abi_drv_load_ifc'
and 'app_fw_from_flash'.

'app_fw_from_flash' defines which firmware should take precedence,
'Disk', 'Flash' or the 'Preferred' firmware. When 'Preferred'
is selected, the management firmware makes the decision on which
firmware will be loaded by comparing versions of the flash firmware
and the host supplied firmware.

'abi_drv_reset' defines when the driver should reset the firmware when
the driver is probed, either 'Disk' if firmware was found on disk,
'Always' reset or 'Never' reset. Note that the device is always reset
on driver unload if firmware was loaded when the driver was probed.

'abi_drv_load_ifc' defines a list of PF devices allowed to load FW on
the device.

Furthermore, we limit the cases to where the driver will unload firmware
again when the driver is removed to only when firmware was loaded by the
driver and only if this particular device was the only one that could
have loaded firmware. This is needed to avoid firmware being removed
while in use on multi-host platforms.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_main.c      | 139 +++++++++++++++++----
 drivers/net/ethernet/netronome/nfp/nfp_main.h      |   2 +
 .../net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h   |  15 +++
 3 files changed, 131 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c b/drivers/net/ethernet/netronome/nfp/nfp_main.c
index 81679647e842..0d8649024505 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c
@@ -352,7 +352,7 @@ nfp_net_fw_request(struct pci_dev *pdev, struct nfp_pf *pf, const char *name)
 
 	err = request_firmware_direct(&fw, name, &pdev->dev);
 	nfp_info(pf->cpp, "  %s: %s\n",
-		 name, err ? "not found" : "found, loading...");
+		 name, err ? "not found" : "found");
 	if (err)
 		return NULL;
 
@@ -430,6 +430,33 @@ nfp_net_fw_find(struct pci_dev *pdev, struct nfp_pf *pf)
 	return nfp_net_fw_request(pdev, pf, fw_name);
 }
 
+static int
+nfp_get_fw_policy_value(struct pci_dev *pdev, struct nfp_nsp *nsp,
+			const char *key, const char *default_val, int max_val,
+			int *value)
+{
+	char hwinfo[64];
+	long hi_val;
+	int err;
+
+	snprintf(hwinfo, sizeof(hwinfo), key);
+	err = nfp_nsp_hwinfo_lookup_optional(nsp, hwinfo, sizeof(hwinfo),
+					     default_val);
+	if (err)
+		return err;
+
+	err = kstrtol(hwinfo, 0, &hi_val);
+	if (err || hi_val < 0 || hi_val > max_val) {
+		dev_warn(&pdev->dev,
+			 "Invalid value '%s' from '%s', ignoring\n",
+			 hwinfo, key);
+		err = kstrtol(default_val, 0, &hi_val);
+	}
+
+	*value = hi_val;
+	return err;
+}
+
 /**
  * nfp_net_fw_load() - Load the firmware image
  * @pdev:       PCI Device structure
@@ -441,44 +468,106 @@ nfp_net_fw_find(struct pci_dev *pdev, struct nfp_pf *pf)
 static int
 nfp_fw_load(struct pci_dev *pdev, struct nfp_pf *pf, struct nfp_nsp *nsp)
 {
-	const struct firmware *fw;
+	bool do_reset, fw_loaded = false;
+	const struct firmware *fw = NULL;
+	int err, reset, policy, ifcs = 0;
+	char *token, *ptr;
+	char hwinfo[64];
 	u16 interface;
-	int err;
+
+	snprintf(hwinfo, sizeof(hwinfo), "abi_drv_load_ifc");
+	err = nfp_nsp_hwinfo_lookup_optional(nsp, hwinfo, sizeof(hwinfo),
+					     NFP_NSP_DRV_LOAD_IFC_DEFAULT);
+	if (err)
+		return err;
 
 	interface = nfp_cpp_interface(pf->cpp);
-	if (NFP_CPP_INTERFACE_UNIT_of(interface) != 0) {
-		/* Only Unit 0 should reset or load firmware */
+	ptr = hwinfo;
+	while ((token = strsep(&ptr, ","))) {
+		unsigned long interface_hi;
+
+		err = kstrtoul(token, 0, &interface_hi);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Failed to parse interface '%s': %d\n",
+				token, err);
+			return err;
+		}
+
+		ifcs++;
+		if (interface == interface_hi)
+			break;
+	}
+
+	if (!token) {
 		dev_info(&pdev->dev, "Firmware will be loaded by partner\n");
 		return 0;
 	}
 
+	err = nfp_get_fw_policy_value(pdev, nsp, "abi_drv_reset",
+				      NFP_NSP_DRV_RESET_DEFAULT,
+				      NFP_NSP_DRV_RESET_NEVER, &reset);
+	if (err)
+		return err;
+
+	err = nfp_get_fw_policy_value(pdev, nsp, "app_fw_from_flash",
+				      NFP_NSP_APP_FW_LOAD_DEFAULT,
+				      NFP_NSP_APP_FW_LOAD_PREF, &policy);
+	if (err)
+		return err;
+
 	fw = nfp_net_fw_find(pdev, pf);
-	if (!fw) {
-		if (nfp_nsp_has_stored_fw_load(nsp))
-			nfp_nsp_load_stored_fw(nsp);
-		return 0;
+	do_reset = reset == NFP_NSP_DRV_RESET_ALWAYS ||
+		   (fw && reset == NFP_NSP_DRV_RESET_DISK);
+
+	if (do_reset) {
+		dev_info(&pdev->dev, "Soft-resetting the NFP\n");
+		err = nfp_nsp_device_soft_reset(nsp);
+		if (err < 0) {
+			dev_err(&pdev->dev,
+				"Failed to soft reset the NFP: %d\n", err);
+			goto exit_release_fw;
+		}
 	}
 
-	dev_info(&pdev->dev, "Soft-reset, loading FW image\n");
-	err = nfp_nsp_device_soft_reset(nsp);
-	if (err < 0) {
-		dev_err(&pdev->dev, "Failed to soft reset the NFP: %d\n",
-			err);
-		goto exit_release_fw;
-	}
+	if (fw && policy != NFP_NSP_APP_FW_LOAD_FLASH) {
+		if (nfp_nsp_has_fw_loaded(nsp) && nfp_nsp_fw_loaded(nsp))
+			goto exit_release_fw;
 
-	err = nfp_nsp_load_fw(nsp, fw);
-	if (err < 0) {
-		dev_err(&pdev->dev, "FW loading failed: %d\n", err);
-		goto exit_release_fw;
+		err = nfp_nsp_load_fw(nsp, fw);
+		if (err < 0) {
+			dev_err(&pdev->dev, "FW loading failed: %d\n",
+				err);
+			goto exit_release_fw;
+		}
+		dev_info(&pdev->dev, "Finished loading FW image\n");
+		fw_loaded = true;
+	} else if (policy != NFP_NSP_APP_FW_LOAD_DISK &&
+		   nfp_nsp_has_stored_fw_load(nsp)) {
+		/* Don't propagate this error to stick with legacy driver
+		 * behavior, failure will be detected later during init.
+		 */
+		if (!nfp_nsp_load_stored_fw(nsp))
+			dev_info(&pdev->dev, "Finished loading stored FW image\n");
+
+		/* Don't flag the fw_loaded in this case since other devices
+		 * may reuse the firmware when configured this way
+		 */
+	} else {
+		dev_warn(&pdev->dev, "Didn't load firmware, please update flash or reconfigure card\n");
 	}
 
-	dev_info(&pdev->dev, "Finished loading FW image\n");
-
 exit_release_fw:
 	release_firmware(fw);
 
-	return err < 0 ? err : 1;
+	/* We don't want to unload firmware when other devices may still be
+	 * dependent on it, which could be the case if there are multiple
+	 * devices that could load firmware.
+	 */
+	if (fw_loaded && ifcs == 1)
+		pf->unload_fw_on_remove = true;
+
+	return err < 0 ? err : fw_loaded;
 }
 
 static void
@@ -704,7 +793,7 @@ static int nfp_pci_probe(struct pci_dev *pdev,
 err_fw_unload:
 	kfree(pf->rtbl);
 	nfp_mip_close(pf->mip);
-	if (pf->fw_loaded)
+	if (pf->unload_fw_on_remove)
 		nfp_fw_unload(pf);
 	kfree(pf->eth_tbl);
 	kfree(pf->nspi);
@@ -744,7 +833,7 @@ static void __nfp_pci_shutdown(struct pci_dev *pdev, bool unload_fw)
 	vfree(pf->dumpspec);
 	kfree(pf->rtbl);
 	nfp_mip_close(pf->mip);
-	if (unload_fw && pf->fw_loaded)
+	if (unload_fw && pf->unload_fw_on_remove)
 		nfp_fw_unload(pf);
 
 	destroy_workqueue(pf->wq);
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.h b/drivers/net/ethernet/netronome/nfp/nfp_main.h
index b7211f200d22..bd6450b0f23f 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.h
@@ -64,6 +64,7 @@ struct nfp_dumpspec {
  * @limit_vfs:		Number of VFs supported by firmware (~0 for PCI limit)
  * @num_vfs:		Number of SR-IOV VFs enabled
  * @fw_loaded:		Is the firmware loaded?
+ * @unload_fw_on_remove:Do we need to unload firmware on driver removal?
  * @ctrl_vnic:		Pointer to the control vNIC if available
  * @mip:		MIP handle
  * @rtbl:		RTsym table
@@ -110,6 +111,7 @@ struct nfp_pf {
 	unsigned int num_vfs;
 
 	bool fw_loaded;
+	bool unload_fw_on_remove;
 
 	struct nfp_net *ctrl_vnic;
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
index 055fda05880d..1531c1870020 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
@@ -102,6 +102,21 @@ enum nfp_eth_fec {
 #define NFP_FEC_REED_SOLOMON	BIT(NFP_FEC_REED_SOLOMON_BIT)
 #define NFP_FEC_DISABLED	BIT(NFP_FEC_DISABLED_BIT)
 
+/* Defines the valid values of the 'abi_drv_reset' hwinfo key */
+#define NFP_NSP_DRV_RESET_DISK			0
+#define NFP_NSP_DRV_RESET_ALWAYS		1
+#define NFP_NSP_DRV_RESET_NEVER			2
+#define NFP_NSP_DRV_RESET_DEFAULT		"0"
+
+/* Defines the valid values of the 'app_fw_from_flash' hwinfo key */
+#define NFP_NSP_APP_FW_LOAD_DISK		0
+#define NFP_NSP_APP_FW_LOAD_FLASH		1
+#define NFP_NSP_APP_FW_LOAD_PREF		2
+#define NFP_NSP_APP_FW_LOAD_DEFAULT		"2"
+
+/* Define the default value for the 'abi_drv_load_ifc' key */
+#define NFP_NSP_DRV_LOAD_IFC_DEFAULT		"0x10ff"
+
 /**
  * struct nfp_eth_table - ETH table information
  * @count:	number of table entries
-- 
2.11.0

[net-next 07/11] nfp: add devlink param infrastructure

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Register devlink parameters for driver use. Subsequent patches will add
support for specific parameters.

In order to support devlink parameters, the management firmware needs to
be able to lookup and set hwinfo keys.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/Makefile        |  1 +
 drivers/net/ethernet/netronome/nfp/devlink_param.c | 60 ++++++++++++++++++++++
 drivers/net/ethernet/netronome/nfp/nfp_main.h      |  3 ++
 drivers/net/ethernet/netronome/nfp/nfp_net_main.c  |  7 +++
 4 files changed, 71 insertions(+)
 create mode 100644 drivers/net/ethernet/netronome/nfp/devlink_param.c

diff --git a/drivers/net/ethernet/netronome/nfp/Makefile b/drivers/net/ethernet/netronome/nfp/Makefile
index 2805641965f3..d31772ae511d 100644
--- a/drivers/net/ethernet/netronome/nfp/Makefile
+++ b/drivers/net/ethernet/netronome/nfp/Makefile
@@ -17,6 +17,7 @@ nfp-objs := \
 	    nfpcore/nfp_target.o \
 	    ccm.o \
 	    ccm_mbox.o \
+	    devlink_param.o \
 	    nfp_asm.o \
 	    nfp_app.o \
 	    nfp_app_nic.o \
diff --git a/drivers/net/ethernet/netronome/nfp/devlink_param.c b/drivers/net/ethernet/netronome/nfp/devlink_param.c
new file mode 100644
index 000000000000..aece98586e32
--- /dev/null
+++ b/drivers/net/ethernet/netronome/nfp/devlink_param.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2019 Netronome Systems, Inc. */
+
+#include <net/devlink.h>
+
+#include "nfpcore/nfp_nsp.h"
+#include "nfp_main.h"
+
+static const struct devlink_param nfp_devlink_params[] = {
+};
+
+static int nfp_devlink_supports_params(struct nfp_pf *pf)
+{
+	struct nfp_nsp *nsp;
+	bool supported;
+	int err;
+
+	nsp = nfp_nsp_open(pf->cpp);
+	if (IS_ERR(nsp)) {
+		err = PTR_ERR(nsp);
+		dev_err(&pf->pdev->dev, "Failed to access the NSP: %d\n", err);
+		return err;
+	}
+
+	supported = nfp_nsp_has_hwinfo_lookup(nsp) &&
+		    nfp_nsp_has_hwinfo_set(nsp);
+
+	nfp_nsp_close(nsp);
+	return supported;
+}
+
+int nfp_devlink_params_register(struct nfp_pf *pf)
+{
+	struct devlink *devlink = priv_to_devlink(pf);
+	int err;
+
+	err = nfp_devlink_supports_params(pf);
+	if (err <= 0)
+		return err;
+
+	err = devlink_params_register(devlink, nfp_devlink_params,
+				      ARRAY_SIZE(nfp_devlink_params));
+	if (err)
+		return err;
+
+	devlink_params_publish(devlink);
+	return 0;
+}
+
+void nfp_devlink_params_unregister(struct nfp_pf *pf)
+{
+	int err;
+
+	err = nfp_devlink_supports_params(pf);
+	if (err <= 0)
+		return;
+
+	devlink_params_unregister(priv_to_devlink(pf), nfp_devlink_params,
+				  ARRAY_SIZE(nfp_devlink_params));
+}
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.h b/drivers/net/ethernet/netronome/nfp/nfp_main.h
index bd6450b0f23f..5d5812fd9317 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.h
@@ -187,4 +187,7 @@ int nfp_shared_buf_pool_get(struct nfp_pf *pf, unsigned int sb, u16 pool_index,
 int nfp_shared_buf_pool_set(struct nfp_pf *pf, unsigned int sb,
 			    u16 pool_index, u32 size,
 			    enum devlink_sb_threshold_type threshold_type);
+
+int nfp_devlink_params_register(struct nfp_pf *pf);
+void nfp_devlink_params_unregister(struct nfp_pf *pf);
 #endif /* NFP_MAIN_H */
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
index 986464d4a206..47addac104fe 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
@@ -711,6 +711,10 @@ int nfp_net_pci_probe(struct nfp_pf *pf)
 	if (err)
 		goto err_devlink_unreg;
 
+	err = nfp_devlink_params_register(pf);
+	if (err)
+		goto err_shared_buf_unreg;
+
 	mutex_lock(&pf->lock);
 	pf->ddir = nfp_net_debugfs_device_add(pf->pdev);
 
@@ -744,6 +748,8 @@ int nfp_net_pci_probe(struct nfp_pf *pf)
 err_clean_ddir:
 	nfp_net_debugfs_dir_clean(&pf->ddir);
 	mutex_unlock(&pf->lock);
+	nfp_devlink_params_unregister(pf);
+err_shared_buf_unreg:
 	nfp_shared_buf_unregister(pf);
 err_devlink_unreg:
 	cancel_work_sync(&pf->port_refresh_work);
@@ -773,6 +779,7 @@ void nfp_net_pci_remove(struct nfp_pf *pf)
 
 	mutex_unlock(&pf->lock);
 
+	nfp_devlink_params_unregister(pf);
 	nfp_shared_buf_unregister(pf);
 	devlink_unregister(priv_to_devlink(pf));
 
-- 
2.11.0

[net-next 08/11] nfp: devlink: add 'fw_load_policy' support

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Add support for the 'fw_load_policy' devlink parameter. The FW load
policy is controlled by the 'app_fw_from_flash' hwinfo key.

Remap the values from devlink to the hwinfo key and back.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 Documentation/networking/devlink-params-nfp.txt    |   2 +
 drivers/net/ethernet/netronome/nfp/devlink_param.c | 165 +++++++++++++++++++++
 2 files changed, 167 insertions(+)
 create mode 100644 Documentation/networking/devlink-params-nfp.txt

diff --git a/Documentation/networking/devlink-params-nfp.txt b/Documentation/networking/devlink-params-nfp.txt
new file mode 100644
index 000000000000..85b1e36f73a8
--- /dev/null
+++ b/Documentation/networking/devlink-params-nfp.txt
@@ -0,0 +1,2 @@
+fw_load_policy		[DEVICE, GENERIC]
+			Configuration mode: permanent
diff --git a/drivers/net/ethernet/netronome/nfp/devlink_param.c b/drivers/net/ethernet/netronome/nfp/devlink_param.c
index aece98586e32..d9c74cfba560 100644
--- a/drivers/net/ethernet/netronome/nfp/devlink_param.c
+++ b/drivers/net/ethernet/netronome/nfp/devlink_param.c
@@ -3,10 +3,175 @@
 
 #include <net/devlink.h>
 
+#include "nfpcore/nfp.h"
 #include "nfpcore/nfp_nsp.h"
 #include "nfp_main.h"
 
+/**
+ * struct nfp_devlink_param_u8_arg - Devlink u8 parameter get/set arguments
+ * @hwinfo_name:	HWinfo key name
+ * @default_hi_val:	Default HWinfo value if HWinfo doesn't exist
+ * @invalid_dl_val:	Devlink value to use if HWinfo is unknown/invalid.
+ *			-errno if there is no unknown/invalid value available
+ * @hi_to_dl:	HWinfo to devlink value mapping
+ * @dl_to_hi:	Devlink to hwinfo value mapping
+ * @max_dl_val:	Maximum devlink value supported, for validation only
+ * @max_hi_val:	Maximum HWinfo value supported, for validation only
+ */
+struct nfp_devlink_param_u8_arg {
+	const char *hwinfo_name;
+	const char *default_hi_val;
+	int invalid_dl_val;
+	u8 hi_to_dl[4];
+	u8 dl_to_hi[4];
+	u8 max_dl_val;
+	u8 max_hi_val;
+};
+
+static const struct nfp_devlink_param_u8_arg nfp_devlink_u8_args[] = {
+	[DEVLINK_PARAM_GENERIC_ID_FW_LOAD_POLICY] = {
+		.hwinfo_name = "app_fw_from_flash",
+		.default_hi_val = NFP_NSP_APP_FW_LOAD_DEFAULT,
+		.invalid_dl_val = -EINVAL,
+		.hi_to_dl = {
+			[NFP_NSP_APP_FW_LOAD_DISK] =
+				DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK,
+			[NFP_NSP_APP_FW_LOAD_FLASH] =
+				DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_FLASH,
+			[NFP_NSP_APP_FW_LOAD_PREF] =
+				DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DRIVER,
+		},
+		.dl_to_hi = {
+			[DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DRIVER] =
+				NFP_NSP_APP_FW_LOAD_PREF,
+			[DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_FLASH] =
+				NFP_NSP_APP_FW_LOAD_FLASH,
+			[DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK] =
+				NFP_NSP_APP_FW_LOAD_DISK,
+		},
+		.max_dl_val = DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK,
+		.max_hi_val = NFP_NSP_APP_FW_LOAD_PREF,
+	},
+};
+
+static int
+nfp_devlink_param_u8_get(struct devlink *devlink, u32 id,
+			 struct devlink_param_gset_ctx *ctx)
+{
+	const struct nfp_devlink_param_u8_arg *arg;
+	struct nfp_pf *pf = devlink_priv(devlink);
+	struct nfp_nsp *nsp;
+	char hwinfo[32];
+	long value;
+	int err;
+
+	if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
+		return -EOPNOTSUPP;
+
+	arg = &nfp_devlink_u8_args[id];
+
+	nsp = nfp_nsp_open(pf->cpp);
+	if (IS_ERR(nsp)) {
+		err = PTR_ERR(nsp);
+		nfp_warn(pf->cpp, "can't access NSP: %d\n", err);
+		return err;
+	}
+
+	snprintf(hwinfo, sizeof(hwinfo), arg->hwinfo_name);
+	err = nfp_nsp_hwinfo_lookup_optional(nsp, hwinfo, sizeof(hwinfo),
+					     arg->default_hi_val);
+	if (err) {
+		nfp_warn(pf->cpp, "HWinfo lookup failed: %d\n", err);
+		goto exit_close_nsp;
+	}
+
+	err = kstrtol(hwinfo, 0, &value);
+	if (err || value < 0 || value > arg->max_hi_val) {
+		nfp_warn(pf->cpp, "HWinfo '%s' value %li invalid\n",
+			 arg->hwinfo_name, value);
+
+		if (arg->invalid_dl_val >= 0)
+			ctx->val.vu8 = arg->invalid_dl_val;
+		else
+			err = arg->invalid_dl_val;
+
+		goto exit_close_nsp;
+	}
+
+	ctx->val.vu8 = arg->hi_to_dl[value];
+
+exit_close_nsp:
+	nfp_nsp_close(nsp);
+	return err;
+}
+
+static int
+nfp_devlink_param_u8_set(struct devlink *devlink, u32 id,
+			 struct devlink_param_gset_ctx *ctx)
+{
+	const struct nfp_devlink_param_u8_arg *arg;
+	struct nfp_pf *pf = devlink_priv(devlink);
+	struct nfp_nsp *nsp;
+	char hwinfo[32];
+	int err;
+
+	if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
+		return -EOPNOTSUPP;
+
+	arg = &nfp_devlink_u8_args[id];
+
+	nsp = nfp_nsp_open(pf->cpp);
+	if (IS_ERR(nsp)) {
+		err = PTR_ERR(nsp);
+		nfp_warn(pf->cpp, "can't access NSP: %d\n", err);
+		return err;
+	}
+
+	/* Note the value has already been validated. */
+	snprintf(hwinfo, sizeof(hwinfo), "%s=%u",
+		 arg->hwinfo_name, arg->dl_to_hi[ctx->val.vu8]);
+	err = nfp_nsp_hwinfo_set(nsp, hwinfo, sizeof(hwinfo));
+	if (err) {
+		nfp_warn(pf->cpp, "HWinfo set failed: %d\n", err);
+		goto exit_close_nsp;
+	}
+
+exit_close_nsp:
+	nfp_nsp_close(nsp);
+	return err;
+}
+
+static int
+nfp_devlink_param_u8_validate(struct devlink *devlink, u32 id,
+			      union devlink_param_value val,
+			      struct netlink_ext_ack *extack)
+{
+	const struct nfp_devlink_param_u8_arg *arg;
+
+	if (id >= ARRAY_SIZE(nfp_devlink_u8_args))
+		return -EOPNOTSUPP;
+
+	arg = &nfp_devlink_u8_args[id];
+
+	if (val.vu8 > arg->max_dl_val) {
+		NL_SET_ERR_MSG_MOD(extack, "parameter out of range");
+		return -EINVAL;
+	}
+
+	if (val.vu8 == arg->invalid_dl_val) {
+		NL_SET_ERR_MSG_MOD(extack, "unknown/invalid value specified");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static const struct devlink_param nfp_devlink_params[] = {
+	DEVLINK_PARAM_GENERIC(FW_LOAD_POLICY,
+			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
+			      nfp_devlink_param_u8_get,
+			      nfp_devlink_param_u8_set,
+			      nfp_devlink_param_u8_validate),
 };
 
 static int nfp_devlink_supports_params(struct nfp_pf *pf)
-- 
2.11.0

[net-next 09/11] nfp: devlink: add 'reset_dev_on_drv_probe' support

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Add support for the 'reset_dev_on_drv_probe' devlink parameter. The
reset control policy is controlled by the 'abi_drv_reset' hwinfo key.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 Documentation/networking/devlink-params-nfp.txt    |  3 +++
 drivers/net/ethernet/netronome/nfp/devlink_param.c | 28 ++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/Documentation/networking/devlink-params-nfp.txt b/Documentation/networking/devlink-params-nfp.txt
index 85b1e36f73a8..43e4d4034865 100644
--- a/Documentation/networking/devlink-params-nfp.txt
+++ b/Documentation/networking/devlink-params-nfp.txt
@@ -1,2 +1,5 @@
 fw_load_policy		[DEVICE, GENERIC]
 			Configuration mode: permanent
+
+reset_dev_on_drv_probe	[DEVICE, GENERIC]
+			Configuration mode: permanent
diff --git a/drivers/net/ethernet/netronome/nfp/devlink_param.c b/drivers/net/ethernet/netronome/nfp/devlink_param.c
index d9c74cfba560..df5a5c88ee76 100644
--- a/drivers/net/ethernet/netronome/nfp/devlink_param.c
+++ b/drivers/net/ethernet/netronome/nfp/devlink_param.c
@@ -52,6 +52,29 @@ static const struct nfp_devlink_param_u8_arg nfp_devlink_u8_args[] = {
 		.max_dl_val = DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK,
 		.max_hi_val = NFP_NSP_APP_FW_LOAD_PREF,
 	},
+	[DEVLINK_PARAM_GENERIC_ID_RESET_DEV] = {
+		.hwinfo_name = "abi_drv_reset",
+		.default_hi_val = NFP_NSP_DRV_RESET_DEFAULT,
+		.invalid_dl_val = DEVLINK_PARAM_RESET_DEV_VALUE_UNKNOWN,
+		.hi_to_dl = {
+			[NFP_NSP_DRV_RESET_ALWAYS] =
+				DEVLINK_PARAM_RESET_DEV_VALUE_ALWAYS,
+			[NFP_NSP_DRV_RESET_NEVER] =
+				DEVLINK_PARAM_RESET_DEV_VALUE_NEVER,
+			[NFP_NSP_DRV_RESET_DISK] =
+				DEVLINK_PARAM_RESET_DEV_VALUE_DISK,
+		},
+		.dl_to_hi = {
+			[DEVLINK_PARAM_RESET_DEV_VALUE_ALWAYS] =
+				NFP_NSP_DRV_RESET_ALWAYS,
+			[DEVLINK_PARAM_RESET_DEV_VALUE_NEVER] =
+				NFP_NSP_DRV_RESET_NEVER,
+			[DEVLINK_PARAM_RESET_DEV_VALUE_DISK] =
+				NFP_NSP_DRV_RESET_DISK,
+		},
+		.max_dl_val = DEVLINK_PARAM_RESET_DEV_VALUE_DISK,
+		.max_hi_val = NFP_NSP_DRV_RESET_NEVER,
+	}
 };
 
 static int
@@ -172,6 +195,11 @@ static const struct devlink_param nfp_devlink_params[] = {
 			      nfp_devlink_param_u8_get,
 			      nfp_devlink_param_u8_set,
 			      nfp_devlink_param_u8_validate),
+	DEVLINK_PARAM_GENERIC(RESET_DEV,
+			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
+			      nfp_devlink_param_u8_get,
+			      nfp_devlink_param_u8_set,
+			      nfp_devlink_param_u8_validate),
 };
 
 static int nfp_devlink_supports_params(struct nfp_pf *pf)
-- 
2.11.0

[net-next 10/11] kdoc: fix nfp_fw_load documentation

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

Fixed the incorrect prefix for the 'nfp_fw_load' function.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c b/drivers/net/ethernet/netronome/nfp/nfp_main.c
index 0d8649024505..c8ad9b701c3e 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c
@@ -458,7 +458,7 @@ nfp_get_fw_policy_value(struct pci_dev *pdev, struct nfp_nsp *nsp,
 }
 
 /**
- * nfp_net_fw_load() - Load the firmware image
+ * nfp_fw_load() - Load the firmware image
  * @pdev:       PCI Device structure
  * @pf:		NFP PF Device structure
  * @nsp:	NFP SP handle
-- 
2.11.0

[net-next 11/11] Documentation: nfp: add nfp driver specific notes

[Simon Horman]

From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>

This adds the initial documentation for the NFP driver specific
documentation.

Right now, only basic information is provided about acquiring firmware
and configuring device firmware loading.

Original driver documentation can be found here:
https://github.com/Netronome/nfp-drv-kmods/blob/master/README.md

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
---
 .../networking/device_drivers/netronome/nfp.rst    | 133 +++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 Documentation/networking/device_drivers/netronome/nfp.rst

diff --git a/Documentation/networking/device_drivers/netronome/nfp.rst b/Documentation/networking/device_drivers/netronome/nfp.rst
new file mode 100644
index 000000000000..6c08ac8b5147
--- /dev/null
+++ b/Documentation/networking/device_drivers/netronome/nfp.rst
@@ -0,0 +1,133 @@
+.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+=============================================
+Netronome Flow Processor (NFP) Kernel Drivers
+=============================================
+
+Copyright (c) 2019, Netronome Systems, Inc.
+
+Contents
+========
+
+- `Overview`_
+- `Acquiring Firmware`_
+
+Overview
+========
+
+This driver supports Netronome's line of Flow Processor devices,
+including the NFP4000, NFP5000, and NFP6000 models, which are also
+incorporated in the company's family of Agilio SmartNICs. The SR-IOV
+physical and virtual functions for these devices are supported by
+the driver.
+
+Acquiring Firmware
+==================
+
+The NFP4000 and NFP6000 devices require application specific firmware
+to function.  Application firmware can be located either on the host file system
+or in the device flash (if supported by management firmware).
+
+Firmware files on the host filesystem contain card type (`AMDA-*` string), media
+config etc.  They should be placed in `/lib/firmware/netronome` directory to
+load firmware from the host file system.
+
+Firmware for basic NIC operation is available in the upstream
+`linux-firmware.git` repository.
+
+Firmware in NVRAM
+-----------------
+
+Recent versions of management firmware supports loading application
+firmware from flash when the host driver gets probed.  The firmware loading
+policy configuration may be used to configure this feature appropriately.
+
+Devlink or ethtool can be used to update the application firmware on the device
+flash by providing the appropriate `nic_AMDA*.nffw` file to the respective
+command.  Users need to take care to write the correct firmware image for the
+card and media configuration to flash.
+
+Available storage space in flash depends on the card being used.
+
+Dealing with multiple projects
+------------------------------
+
+NFP hardware is fully programmable therefore there can be different
+firmware images targeting different applications.
+
+When using application firmware from host, we recommend placing
+actual firmware files in application-named subdirectories in
+`/lib/firmware/netronome` and linking the desired files, e.g.::
+
+    $ tree /lib/firmware/netronome/
+    /lib/firmware/netronome/
+    ├── bpf
+    │   ├── nic_AMDA0081-0001_1x40.nffw
+    │   └── nic_AMDA0081-0001_4x10.nffw
+    ├── flower
+    │   ├── nic_AMDA0081-0001_1x40.nffw
+    │   └── nic_AMDA0081-0001_4x10.nffw
+    ├── nic
+    │   ├── nic_AMDA0081-0001_1x40.nffw
+    │   └── nic_AMDA0081-0001_4x10.nffw
+    ├── nic_AMDA0081-0001_1x40.nffw -> bpf/nic_AMDA0081-0001_1x40.nffw
+    └── nic_AMDA0081-0001_4x10.nffw -> bpf/nic_AMDA0081-0001_4x10.nffw
+
+    3 directories, 8 files
+
+You may need to use hard instead of symbolic links on distributions
+which use old `mkinitrd` command instead of `dracut` (e.g. Ubuntu).
+
+After changing firmware files you may need to regenerate the initramfs
+image.  Initramfs contains drivers and firmware files your system may
+need to boot.  Refer to the documentation of your distribution to find
+out how to update initramfs.  Good indication of stale initramfs
+is system loading wrong driver or firmware on boot, but when driver is
+later reloaded manually everything works correctly.
+
+Selecting firmware per device
+-----------------------------
+
+Most commonly all cards on the system use the same type of firmware.
+If you want to load specific firmware image for a specific card, you
+can use either the PCI bus address or serial number.  Driver will print
+which files it's looking for when it recognizes a NFP device::
+
+    nfp: Looking for firmware file in order of priority:
+    nfp:  netronome/serial-00-12-34-aa-bb-cc-10-ff.nffw: not found
+    nfp:  netronome/pci-0000:02:00.0.nffw: not found
+    nfp:  netronome/nic_AMDA0081-0001_1x40.nffw: found, loading...
+
+In this case if file (or link) called *serial-00-12-34-aa-bb-5d-10-ff.nffw*
+or *pci-0000:02:00.0.nffw* is present in `/lib/firmware/netronome` this
+firmware file will take precedence over `nic_AMDA*` files.
+
+Note that `serial-*` and `pci-*` files are **not** automatically included
+in initramfs, you will have to refer to documentation of appropriate tools
+to find out how to include them.
+
+Firmware loading policy
+-----------------------
+
+Firmware loading policy is controlled via three HWinfo parameters
+stored as key value pairs in the device flash:
+
+app_fw_from_flash
+    Defines which firmware should take precedence, 'Disk' (0), 'Flash' (1) or
+    the 'Preferred' (2) firmware. When 'Preferred' is selected, the management
+    firmware makes the decision over which firmware will be loaded by comparing
+    versions of the flash firmware and the host supplied firmware.
+    This variable is configurable using the 'fw_load_policy'
+    devlink parameter.
+
+abi_drv_reset
+    Defines if the driver should reset the firmware when
+    the driver is probed, either 'Disk' (0) if firmware was found on disk,
+    'Always' (1) reset or 'Never' (2) reset. Note that the device is always
+    reset on driver unload if firmware was loaded when the driver was probed.
+    This variable is configurable using the 'reset_dev_on_drv_probe'
+    devlink parameter.
+
+abi_drv_load_ifc
+    Defines a list of PF devices allowed to load FW on the device.
+    This variable is not currently user configurable.
-- 
2.11.0

Re: [net-next 02/11] devlink: add 'reset_dev_on_drv_probe' param

[Jiri Pirko]

Fri, Sep 06, 2019 at 06:00:52PM CEST, simon.horman@netronome.com wrote:
>From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
>
>Add the 'reset_dev_on_drv_probe' devlink parameter, controlling the
>device reset policy on driver probe.
>
>This parameter is useful in conjunction with the existing
>'fw_load_policy' parameter.
>
>Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
>Signed-off-by: Simon Horman <simon.horman@netronome.com>
>---
> Documentation/networking/devlink-params.txt | 14 ++++++++++++++
> include/net/devlink.h                       |  4 ++++
> include/uapi/linux/devlink.h                |  7 +++++++
> net/core/devlink.c                          |  5 +++++
> 4 files changed, 30 insertions(+)
>
>diff --git a/Documentation/networking/devlink-params.txt b/Documentation/networking/devlink-params.txt
>index fadb5436188d..f9e30d686243 100644
>--- a/Documentation/networking/devlink-params.txt
>+++ b/Documentation/networking/devlink-params.txt
>@@ -51,3 +51,17 @@ fw_load_policy		[DEVICE, GENERIC]
> 			* DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK (2)
> 			  Load firmware currently available on host's disk.
> 			Type: u8
>+
>+reset_dev_on_drv_probe	[DEVICE, GENERIC]
>+			Controls the device's reset policy on driver probe.
>+			Valid values:
>+			* DEVLINK_PARAM_RESET_DEV_VALUE_UNKNOWN (0)
>+			  Unknown or invalid value.

Why do you need this? Do you have usecase for this value?


>+			* DEVLINK_PARAM_RESET_DEV_VALUE_ALWAYS (1)
>+			  Always reset device on driver probe.
>+			* DEVLINK_PARAM_RESET_DEV_VALUE_NEVER (2)
>+			  Never reset device on driver probe.
>+			* DEVLINK_PARAM_RESET_DEV_VALUE_DISK (3)
>+			  Reset only if device firmware can be found in the
>+			  filesystem.
>+			Type: u8
>diff --git a/include/net/devlink.h b/include/net/devlink.h
>index 460bc629d1a4..d880de5b8d3a 100644
>--- a/include/net/devlink.h
>+++ b/include/net/devlink.h
>@@ -398,6 +398,7 @@ enum devlink_param_generic_id {
> 	DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX,
> 	DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN,
> 	DEVLINK_PARAM_GENERIC_ID_FW_LOAD_POLICY,
>+	DEVLINK_PARAM_GENERIC_ID_RESET_DEV,
> 
> 	/* add new param generic ids above here*/
> 	__DEVLINK_PARAM_GENERIC_ID_MAX,
>@@ -428,6 +429,9 @@ enum devlink_param_generic_id {
> #define DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_NAME "fw_load_policy"
> #define DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_TYPE DEVLINK_PARAM_TYPE_U8
> 
>+#define DEVLINK_PARAM_GENERIC_RESET_DEV_NAME "reset_dev_on_drv_probe"

The name of the define and name of the string should be the same. Please
adjust.


>+#define DEVLINK_PARAM_GENERIC_RESET_DEV_TYPE DEVLINK_PARAM_TYPE_U8
>+
> #define DEVLINK_PARAM_GENERIC(_id, _cmodes, _get, _set, _validate)	\
> {									\
> 	.id = DEVLINK_PARAM_GENERIC_ID_##_id,				\
>diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
>index c25cc29a6647..3172d1b3329f 100644
>--- a/include/uapi/linux/devlink.h
>+++ b/include/uapi/linux/devlink.h
>@@ -205,6 +205,13 @@ enum devlink_param_fw_load_policy_value {
> 	DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK,
> };
> 
>+enum devlink_param_reset_dev_value {
>+	DEVLINK_PARAM_RESET_DEV_VALUE_UNKNOWN,
>+	DEVLINK_PARAM_RESET_DEV_VALUE_ALWAYS,
>+	DEVLINK_PARAM_RESET_DEV_VALUE_NEVER,
>+	DEVLINK_PARAM_RESET_DEV_VALUE_DISK,
>+};
>+
> enum {
> 	DEVLINK_ATTR_STATS_RX_PACKETS,		/* u64 */
> 	DEVLINK_ATTR_STATS_RX_BYTES,		/* u64 */
>diff --git a/net/core/devlink.c b/net/core/devlink.c
>index 6e52d639dac6..e8bc96f104a7 100644
>--- a/net/core/devlink.c
>+++ b/net/core/devlink.c
>@@ -2852,6 +2852,11 @@ static const struct devlink_param devlink_param_generic[] = {
> 		.name = DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_NAME,
> 		.type = DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_TYPE,
> 	},
>+	{
>+		.id = DEVLINK_PARAM_GENERIC_ID_RESET_DEV,
>+		.name = DEVLINK_PARAM_GENERIC_RESET_DEV_NAME,
>+		.type = DEVLINK_PARAM_GENERIC_RESET_DEV_TYPE,
>+	},
> };
> 
> static int devlink_param_generic_verify(const struct devlink_param *param)
>-- 
>2.11.0
>

Re: [net-next 02/11] devlink: add 'reset_dev_on_drv_probe' param

[Dirk van der Merwe]

On 9/6/19 11:31 AM, Jiri Pirko wrote:
> Fri, Sep 06, 2019 at 06:00:52PM CEST, simon.horman@netronome.com wrote:
>> From: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
>>
>> Add the 'reset_dev_on_drv_probe' devlink parameter, controlling the
>> device reset policy on driver probe.
>>
>> This parameter is useful in conjunction with the existing
>> 'fw_load_policy' parameter.
>>
>> Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
>> Signed-off-by: Simon Horman <simon.horman@netronome.com>
>> ---
>> Documentation/networking/devlink-params.txt | 14 ++++++++++++++
>> include/net/devlink.h                       |  4 ++++
>> include/uapi/linux/devlink.h                |  7 +++++++
>> net/core/devlink.c                          |  5 +++++
>> 4 files changed, 30 insertions(+)
>>
>> diff --git a/Documentation/networking/devlink-params.txt b/Documentation/networking/devlink-params.txt
>> index fadb5436188d..f9e30d686243 100644
>> --- a/Documentation/networking/devlink-params.txt
>> +++ b/Documentation/networking/devlink-params.txt
>> @@ -51,3 +51,17 @@ fw_load_policy		[DEVICE, GENERIC]
>> 			* DEVLINK_PARAM_FW_LOAD_POLICY_VALUE_DISK (2)
>> 			  Load firmware currently available on host's disk.
>> 			Type: u8
>> +
>> +reset_dev_on_drv_probe	[DEVICE, GENERIC]
>> +			Controls the device's reset policy on driver probe.
>> +			Valid values:
>> +			* DEVLINK_PARAM_RESET_DEV_VALUE_UNKNOWN (0)
>> +			  Unknown or invalid value.
> Why do you need this? Do you have usecase for this value?


I added this in to avoid having the entire netlink dump fail when there 
are invalid values read from hardware.

This way, it can report an unknown or invalid value instead of failing 
the operation.


>
>
>> +			* DEVLINK_PARAM_RESET_DEV_VALUE_ALWAYS (1)
>> +			  Always reset device on driver probe.
>> +			* DEVLINK_PARAM_RESET_DEV_VALUE_NEVER (2)
>> +			  Never reset device on driver probe.
>> +			* DEVLINK_PARAM_RESET_DEV_VALUE_DISK (3)
>> +			  Reset only if device firmware can be found in the
>> +			  filesystem.
>> +			Type: u8
>> diff --git a/include/net/devlink.h b/include/net/devlink.h
>> index 460bc629d1a4..d880de5b8d3a 100644
>> --- a/include/net/devlink.h
>> +++ b/include/net/devlink.h
>> @@ -398,6 +398,7 @@ enum devlink_param_generic_id {
>> 	DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX,
>> 	DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN,
>> 	DEVLINK_PARAM_GENERIC_ID_FW_LOAD_POLICY,
>> +	DEVLINK_PARAM_GENERIC_ID_RESET_DEV,
>>
>> 	/* add new param generic ids above here*/
>> 	__DEVLINK_PARAM_GENERIC_ID_MAX,
>> @@ -428,6 +429,9 @@ enum devlink_param_generic_id {
>> #define DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_NAME "fw_load_policy"
>> #define DEVLINK_PARAM_GENERIC_FW_LOAD_POLICY_TYPE DEVLINK_PARAM_TYPE_U8
>>
>> +#define DEVLINK_PARAM_GENERIC_RESET_DEV_NAME "reset_dev_on_drv_probe"
> The name of the define and name of the string should be the same. Please
> adjust.


Sure, I will make the change.

Thanks for the review.

Re: [net-next 02/11] devlink: add 'reset_dev_on_drv_probe' param

[Jakub Kicinski]

On Fri, 6 Sep 2019 11:40:54 -0700, Dirk van der Merwe wrote:
> >> DEVLINK_PARAM_RESET_DEV_VALUE_UNKNOWN (0)
> >> +			  Unknown or invalid value.  
> > Why do you need this? Do you have usecase for this value?  
> 
> I added this in to avoid having the entire netlink dump fail when there 
> are invalid values read from hardware.
> 
> This way, it can report an unknown or invalid value instead of failing 
> the operation.

That's the first reason, the second is that we also want to report 
the unknown value if it's not recognized by the driver. For u8/enum
parameters the value may possibly be set to a value older driver
doesn't understand, but users should still be able to set them to one
of the known ones.

We'd also like to add that to 'fw_load_policy'. WDYT?

Re: [net-next 02/11] devlink: add 'reset_dev_on_drv_probe' param

[Jiri Pirko]

Sat, Sep 07, 2019 at 06:17:30AM CEST, jakub.kicinski@netronome.com wrote:
>On Fri, 6 Sep 2019 11:40:54 -0700, Dirk van der Merwe wrote:
>> >> DEVLINK_PARAM_RESET_DEV_VALUE_UNKNOWN (0)
>> >> +			  Unknown or invalid value.  
>> > Why do you need this? Do you have usecase for this value?  
>> 
>> I added this in to avoid having the entire netlink dump fail when there 
>> are invalid values read from hardware.
>> 
>> This way, it can report an unknown or invalid value instead of failing 
>> the operation.
>
>That's the first reason, the second is that we also want to report 
>the unknown value if it's not recognized by the driver. For u8/enum
>parameters the value may possibly be set to a value older driver
>doesn't understand, but users should still be able to set them to one
>of the known ones.

Ok.

>
>We'd also like to add that to 'fw_load_policy'. WDYT?

Ok.