[PATCH net-next 0/5] ipv4: Convert several tos fields to dscp_t

[PATCH net-next 0/5] ipv4: Convert several tos fields to dscp_t

[Guillaume Nault]

Continue the work started with commit a410a0cf9885 ("ipv6: Define
dscp_t and stop taking ECN bits into account in fib6-rules") and
convert more structure fields and variables to dscp_t. This series
focuses on struct fib_rt_info, struct fib_entry_notifier_info and their
users (networking drivers).

The purpose of dscp_t is to ensure that ECN bits don't influence IP
route lookups. It does so by ensuring that dscp_t variables have the
ECN bits cleared.

Notes:
  * This series is entirely about type annotation and isn't supposed
to have any user visible effect.

  * The first two patches have to introduce a few dsfield <-> dscp
conversions in the affected drivers, but those are then removed when
converting the internal driver structures (patches 3-5). In the end,
drivers don't have to handle any conversion.

Guillaume Nault (5):
  ipv4: Use dscp_t in struct fib_rt_info
  ipv4: Use dscp_t in struct fib_entry_notifier_info
  netdevsim: Use dscp_t in struct nsim_fib4_rt
  mlxsw: Use dscp_t in struct mlxsw_sp_fib4_entry
  net: marvell: prestera: Use dscp_t in struct prestera_kern_fib_cache

 .../ethernet/marvell/prestera/prestera_router.c   | 11 ++++++-----
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c | 15 ++++++++-------
 drivers/net/netdevsim/fib.c                       |  9 +++++----
 include/net/ip_fib.h                              |  4 ++--
 net/ipv4/fib_semantics.c                          |  4 ++--
 net/ipv4/fib_trie.c                               | 10 +++++-----
 net/ipv4/route.c                                  |  4 ++--
 7 files changed, 30 insertions(+), 27 deletions(-)

-- 
2.21.3

[PATCH net-next 1/5] ipv4: Use dscp_t in struct fib_rt_info

[Guillaume Nault]

Use the new dscp_t type to replace the tos field of struct fib_rt_info.
This ensures ECN bits are ignored and makes it compatible with the
fa_dscp field of struct fib_alias.

This also allows sparse to flag potential incorrect uses of DSCP and
ECN bits.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
---
 drivers/net/ethernet/marvell/prestera/prestera_router.c | 3 ++-
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c   | 7 ++++---
 drivers/net/netdevsim/fib.c                             | 5 +++--
 include/net/ip_fib.h                                    | 2 +-
 net/ipv4/fib_semantics.c                                | 4 ++--
 net/ipv4/fib_trie.c                                     | 6 +++---
 net/ipv4/route.c                                        | 4 ++--
 7 files changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
index 6c5618cf4f08..99d60c9ae54d 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
@@ -4,6 +4,7 @@
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/inetdevice.h>
+#include <net/inet_dscp.h>
 #include <net/switchdev.h>
 #include <linux/rhashtable.h>
 
@@ -132,7 +133,7 @@ __prestera_k_arb_fib_lpm_offload_set(struct prestera_switch *sw,
 	fri.tb_id = fc->key.kern_tb_id;
 	fri.dst = fc->key.addr.u.ipv4;
 	fri.dst_len = fc->key.prefix_len;
-	fri.tos = fc->kern_tos;
+	fri.dscp = inet_dsfield_to_dscp(fc->kern_tos);
 	fri.type = fc->kern_type;
 	/* flags begin */
 	fri.offload = offload;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 79fd486e29e3..596516ba73c1 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -21,6 +21,7 @@
 #include <net/netevent.h>
 #include <net/neighbour.h>
 #include <net/arp.h>
+#include <net/inet_dscp.h>
 #include <net/ip_fib.h>
 #include <net/ip6_fib.h>
 #include <net/nexthop.h>
@@ -5620,7 +5621,7 @@ mlxsw_sp_fib4_offload_failed_flag_set(struct mlxsw_sp *mlxsw_sp,
 	fri.tb_id = fen_info->tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = fen_info->dst_len;
-	fri.tos = fen_info->tos;
+	fri.dscp = inet_dsfield_to_dscp(fen_info->tos);
 	fri.type = fen_info->type;
 	fri.offload = false;
 	fri.trap = false;
@@ -5645,7 +5646,7 @@ mlxsw_sp_fib4_entry_hw_flags_set(struct mlxsw_sp *mlxsw_sp,
 	fri.tb_id = fib4_entry->tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = dst_len;
-	fri.tos = fib4_entry->tos;
+	fri.dscp = inet_dsfield_to_dscp(fib4_entry->tos);
 	fri.type = fib4_entry->type;
 	fri.offload = should_offload;
 	fri.trap = !should_offload;
@@ -5668,7 +5669,7 @@ mlxsw_sp_fib4_entry_hw_flags_clear(struct mlxsw_sp *mlxsw_sp,
 	fri.tb_id = fib4_entry->tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = dst_len;
-	fri.tos = fib4_entry->tos;
+	fri.dscp = inet_dsfield_to_dscp(fib4_entry->tos);
 	fri.type = fib4_entry->type;
 	fri.offload = false;
 	fri.trap = false;
diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c
index 378ee779061c..31e73709aac5 100644
--- a/drivers/net/netdevsim/fib.c
+++ b/drivers/net/netdevsim/fib.c
@@ -22,6 +22,7 @@
 #include <linux/spinlock_types.h>
 #include <linux/types.h>
 #include <net/fib_notifier.h>
+#include <net/inet_dscp.h>
 #include <net/ip_fib.h>
 #include <net/ip6_fib.h>
 #include <net/fib_rules.h>
@@ -322,7 +323,7 @@ nsim_fib4_rt_offload_failed_flag_set(struct net *net,
 	fri.tb_id = fen_info->tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = fen_info->dst_len;
-	fri.tos = fen_info->tos;
+	fri.dscp = inet_dsfield_to_dscp(fen_info->tos);
 	fri.type = fen_info->type;
 	fri.offload = false;
 	fri.trap = false;
@@ -342,7 +343,7 @@ static void nsim_fib4_rt_hw_flags_set(struct net *net,
 	fri.tb_id = fib4_rt->common.key.tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = dst_len;
-	fri.tos = fib4_rt->tos;
+	fri.dscp = inet_dsfield_to_dscp(fib4_rt->tos);
 	fri.type = fib4_rt->type;
 	fri.offload = false;
 	fri.trap = trap;
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 6a82bcb8813b..f08ba531ac08 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -212,7 +212,7 @@ struct fib_rt_info {
 	u32			tb_id;
 	__be32			dst;
 	int			dst_len;
-	u8			tos;
+	dscp_t			dscp;
 	u8			type;
 	u8			offload:1,
 				trap:1,
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index ccb62038f6a4..a57ba23571c9 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -524,7 +524,7 @@ void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
 	fri.tb_id = tb_id;
 	fri.dst = key;
 	fri.dst_len = dst_len;
-	fri.tos = inet_dscp_to_dsfield(fa->fa_dscp);
+	fri.dscp = fa->fa_dscp;
 	fri.type = fa->fa_type;
 	fri.offload = READ_ONCE(fa->offload);
 	fri.trap = READ_ONCE(fa->trap);
@@ -1781,7 +1781,7 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
 	rtm->rtm_family = AF_INET;
 	rtm->rtm_dst_len = fri->dst_len;
 	rtm->rtm_src_len = 0;
-	rtm->rtm_tos = fri->tos;
+	rtm->rtm_tos = inet_dscp_to_dsfield(fri->dscp);
 	if (tb_id < 256)
 		rtm->rtm_table = tb_id;
 	else
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index fb0e49c36c2e..e96f02f0ab93 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1032,8 +1032,8 @@ fib_find_matching_alias(struct net *net, const struct fib_rt_info *fri)
 
 	hlist_for_each_entry_rcu(fa, &l->leaf, fa_list) {
 		if (fa->fa_slen == slen && fa->tb_id == fri->tb_id &&
-		    fa->fa_dscp == inet_dsfield_to_dscp(fri->tos) &&
-		    fa->fa_info == fri->fi && fa->fa_type == fri->type)
+		    fa->fa_dscp == fri->dscp && fa->fa_info == fri->fi &&
+		    fa->fa_type == fri->type)
 			return fa;
 	}
 
@@ -2305,7 +2305,7 @@ static int fn_trie_dump_leaf(struct key_vector *l, struct fib_table *tb,
 				fri.tb_id = tb->tb_id;
 				fri.dst = xkey;
 				fri.dst_len = KEYLENGTH - fa->fa_slen;
-				fri.tos = inet_dscp_to_dsfield(fa->fa_dscp);
+				fri.dscp = fa->fa_dscp;
 				fri.type = fa->fa_type;
 				fri.offload = READ_ONCE(fa->offload);
 				fri.trap = READ_ONCE(fa->trap);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 98c6f3429593..80f96170876c 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3394,7 +3394,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 		fri.tb_id = table_id;
 		fri.dst = res.prefix;
 		fri.dst_len = res.prefixlen;
-		fri.tos = fl4.flowi4_tos;
+		fri.dscp = inet_dsfield_to_dscp(fl4.flowi4_tos);
 		fri.type = rt->rt_type;
 		fri.offload = 0;
 		fri.trap = 0;
@@ -3407,7 +3407,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
 
 				if (fa->fa_slen == slen &&
 				    fa->tb_id == fri.tb_id &&
-				    fa->fa_dscp == inet_dsfield_to_dscp(fri.tos) &&
+				    fa->fa_dscp == fri.dscp &&
 				    fa->fa_info == res.fi &&
 				    fa->fa_type == fri.type) {
 					fri.offload = READ_ONCE(fa->offload);
-- 
2.21.3

Re: [PATCH net-next 1/5] ipv4: Use dscp_t in struct fib_rt_info

[Ido Schimmel]

On Fri, Apr 08, 2022 at 10:08:37PM +0200, Guillaume Nault wrote:
> Use the new dscp_t type to replace the tos field of struct fib_rt_info.
> This ensures ECN bits are ignored and makes it compatible with the
> fa_dscp field of struct fib_alias.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>

Reviewed-by: Ido Schimmel <idosch@nvidia.com>

Re: [PATCH net-next 1/5] ipv4: Use dscp_t in struct fib_rt_info

[David Ahern]

On 4/8/22 2:08 PM, Guillaume Nault wrote:
> Use the new dscp_t type to replace the tos field of struct fib_rt_info.
> This ensures ECN bits are ignored and makes it compatible with the
> fa_dscp field of struct fib_alias.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>
> ---
>  drivers/net/ethernet/marvell/prestera/prestera_router.c | 3 ++-
>  drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c   | 7 ++++---
>  drivers/net/netdevsim/fib.c                             | 5 +++--
>  include/net/ip_fib.h                                    | 2 +-
>  net/ipv4/fib_semantics.c                                | 4 ++--
>  net/ipv4/fib_trie.c                                     | 6 +++---
>  net/ipv4/route.c                                        | 4 ++--
>  7 files changed, 17 insertions(+), 14 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>

[PATCH net-next 2/5] ipv4: Use dscp_t in struct fib_entry_notifier_info

[Guillaume Nault]

Use the new dscp_t type to replace the tos field of struct
fib_entry_notifier_info. This ensures ECN bits are ignored and makes it
compatible with the dscp field of struct fib_rt_info.

This also allows sparse to flag potential incorrect uses of DSCP and
ECN bits.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
---
 drivers/net/ethernet/marvell/prestera/prestera_router.c | 6 +++---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c   | 6 +++---
 drivers/net/netdevsim/fib.c                             | 4 ++--
 include/net/ip_fib.h                                    | 2 +-
 net/ipv4/fib_trie.c                                     | 4 ++--
 5 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
index 99d60c9ae54d..a6b608ade2b9 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
@@ -89,7 +89,7 @@ prestera_kern_fib_cache_destroy(struct prestera_switch *sw,
 static struct prestera_kern_fib_cache *
 prestera_kern_fib_cache_create(struct prestera_switch *sw,
 			       struct prestera_kern_fib_cache_key *key,
-			       struct fib_info *fi, u8 tos, u8 type)
+			       struct fib_info *fi, dscp_t dscp, u8 type)
 {
 	struct prestera_kern_fib_cache *fib_cache;
 	int err;
@@ -101,7 +101,7 @@ prestera_kern_fib_cache_create(struct prestera_switch *sw,
 	memcpy(&fib_cache->key, key, sizeof(*key));
 	fib_info_hold(fi);
 	fib_cache->fi = fi;
-	fib_cache->kern_tos = tos;
+	fib_cache->kern_tos = inet_dscp_to_dsfield(dscp);
 	fib_cache->kern_type = type;
 
 	err = rhashtable_insert_fast(&sw->router->kern_fib_cache_ht,
@@ -306,7 +306,7 @@ prestera_k_arb_fib_evt(struct prestera_switch *sw,
 	if (replace) {
 		fib_cache = prestera_kern_fib_cache_create(sw, &fc_key,
 							   fen_info->fi,
-							   fen_info->tos,
+							   fen_info->dscp,
 							   fen_info->type);
 		if (!fib_cache) {
 			dev_err(sw->dev->dev, "fib_cache == NULL");
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 596516ba73c1..1c451d648302 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -5621,7 +5621,7 @@ mlxsw_sp_fib4_offload_failed_flag_set(struct mlxsw_sp *mlxsw_sp,
 	fri.tb_id = fen_info->tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = fen_info->dst_len;
-	fri.dscp = inet_dsfield_to_dscp(fen_info->tos);
+	fri.dscp = fen_info->dscp;
 	fri.type = fen_info->type;
 	fri.offload = false;
 	fri.trap = false;
@@ -6251,7 +6251,7 @@ mlxsw_sp_fib4_entry_create(struct mlxsw_sp *mlxsw_sp,
 	fib_info_hold(fib4_entry->fi);
 	fib4_entry->tb_id = fen_info->tb_id;
 	fib4_entry->type = fen_info->type;
-	fib4_entry->tos = fen_info->tos;
+	fib4_entry->tos = inet_dscp_to_dsfield(fen_info->dscp);
 
 	fib_entry->fib_node = fib_node;
 
@@ -6305,7 +6305,7 @@ mlxsw_sp_fib4_entry_lookup(struct mlxsw_sp *mlxsw_sp,
 	fib4_entry = container_of(fib_node->fib_entry,
 				  struct mlxsw_sp_fib4_entry, common);
 	if (fib4_entry->tb_id == fen_info->tb_id &&
-	    fib4_entry->tos == fen_info->tos &&
+	    fib4_entry->tos == inet_dscp_to_dsfield(fen_info->dscp) &&
 	    fib4_entry->type == fen_info->type &&
 	    fib4_entry->fi == fen_info->fi)
 		return fib4_entry;
diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c
index 31e73709aac5..fb9af26122ac 100644
--- a/drivers/net/netdevsim/fib.c
+++ b/drivers/net/netdevsim/fib.c
@@ -284,7 +284,7 @@ nsim_fib4_rt_create(struct nsim_fib_data *data,
 
 	fib4_rt->fi = fen_info->fi;
 	fib_info_hold(fib4_rt->fi);
-	fib4_rt->tos = fen_info->tos;
+	fib4_rt->tos = inet_dscp_to_dsfield(fen_info->dscp);
 	fib4_rt->type = fen_info->type;
 
 	return fib4_rt;
@@ -323,7 +323,7 @@ nsim_fib4_rt_offload_failed_flag_set(struct net *net,
 	fri.tb_id = fen_info->tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = fen_info->dst_len;
-	fri.dscp = inet_dsfield_to_dscp(fen_info->tos);
+	fri.dscp = fen_info->dscp;
 	fri.type = fen_info->type;
 	fri.offload = false;
 	fri.trap = false;
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index f08ba531ac08..a378eff827c7 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -225,7 +225,7 @@ struct fib_entry_notifier_info {
 	u32 dst;
 	int dst_len;
 	struct fib_info *fi;
-	u8 tos;
+	dscp_t dscp;
 	u8 type;
 	u32 tb_id;
 };
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index e96f02f0ab93..1f7f25532fa1 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -82,7 +82,7 @@ static int call_fib_entry_notifier(struct notifier_block *nb,
 		.dst = dst,
 		.dst_len = dst_len,
 		.fi = fa->fa_info,
-		.tos = inet_dscp_to_dsfield(fa->fa_dscp),
+		.dscp = fa->fa_dscp,
 		.type = fa->fa_type,
 		.tb_id = fa->tb_id,
 	};
@@ -99,7 +99,7 @@ static int call_fib_entry_notifiers(struct net *net,
 		.dst = dst,
 		.dst_len = dst_len,
 		.fi = fa->fa_info,
-		.tos = inet_dscp_to_dsfield(fa->fa_dscp),
+		.dscp = fa->fa_dscp,
 		.type = fa->fa_type,
 		.tb_id = fa->tb_id,
 	};
-- 
2.21.3

Re: [PATCH net-next 2/5] ipv4: Use dscp_t in struct fib_entry_notifier_info

[Ido Schimmel]

On Fri, Apr 08, 2022 at 10:08:40PM +0200, Guillaume Nault wrote:
> Use the new dscp_t type to replace the tos field of struct
> fib_entry_notifier_info. This ensures ECN bits are ignored and makes it
> compatible with the dscp field of struct fib_rt_info.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>

Reviewed-by: Ido Schimmel <idosch@nvidia.com>

Re: [PATCH net-next 2/5] ipv4: Use dscp_t in struct fib_entry_notifier_info

[David Ahern]

On 4/8/22 2:08 PM, Guillaume Nault wrote:
> Use the new dscp_t type to replace the tos field of struct
> fib_entry_notifier_info. This ensures ECN bits are ignored and makes it
> compatible with the dscp field of struct fib_rt_info.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>
> ---
>  drivers/net/ethernet/marvell/prestera/prestera_router.c | 6 +++---
>  drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c   | 6 +++---
>  drivers/net/netdevsim/fib.c                             | 4 ++--
>  include/net/ip_fib.h                                    | 2 +-
>  net/ipv4/fib_trie.c                                     | 4 ++--
>  5 files changed, 11 insertions(+), 11 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>

[PATCH net-next 3/5] netdevsim: Use dscp_t in struct nsim_fib4_rt

[Guillaume Nault]

Use the new dscp_t type to replace the tos field of struct
nsim_fib4_rt. This ensures ECN bits are ignored and makes it compatible
with the dscp fields of struct fib_entry_notifier_info and struct
fib_rt_info.

This also allows sparse to flag potential incorrect uses of DSCP and
ECN bits.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
---
 drivers/net/netdevsim/fib.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c
index fb9af26122ac..c8f398f5bc5b 100644
--- a/drivers/net/netdevsim/fib.c
+++ b/drivers/net/netdevsim/fib.c
@@ -79,7 +79,7 @@ struct nsim_fib_rt {
 struct nsim_fib4_rt {
 	struct nsim_fib_rt common;
 	struct fib_info *fi;
-	u8 tos;
+	dscp_t dscp;
 	u8 type;
 };
 
@@ -284,7 +284,7 @@ nsim_fib4_rt_create(struct nsim_fib_data *data,
 
 	fib4_rt->fi = fen_info->fi;
 	fib_info_hold(fib4_rt->fi);
-	fib4_rt->tos = inet_dscp_to_dsfield(fen_info->dscp);
+	fib4_rt->dscp = fen_info->dscp;
 	fib4_rt->type = fen_info->type;
 
 	return fib4_rt;
@@ -343,7 +343,7 @@ static void nsim_fib4_rt_hw_flags_set(struct net *net,
 	fri.tb_id = fib4_rt->common.key.tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = dst_len;
-	fri.dscp = inet_dsfield_to_dscp(fib4_rt->tos);
+	fri.dscp = fib4_rt->dscp;
 	fri.type = fib4_rt->type;
 	fri.offload = false;
 	fri.trap = trap;
-- 
2.21.3

Re: [PATCH net-next 3/5] netdevsim: Use dscp_t in struct nsim_fib4_rt

[Jakub Kicinski]

On Fri, 8 Apr 2022 22:08:43 +0200 Guillaume Nault wrote:
> Use the new dscp_t type to replace the tos field of struct
> nsim_fib4_rt. This ensures ECN bits are ignored and makes it compatible
> with the dscp fields of struct fib_entry_notifier_info and struct
> fib_rt_info.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>

Acked-by: Jakub Kicinski <kuba@kernel.org>

Re: [PATCH net-next 3/5] netdevsim: Use dscp_t in struct nsim_fib4_rt

[Ido Schimmel]

On Fri, Apr 08, 2022 at 10:08:43PM +0200, Guillaume Nault wrote:
> Use the new dscp_t type to replace the tos field of struct
> nsim_fib4_rt. This ensures ECN bits are ignored and makes it compatible
> with the dscp fields of struct fib_entry_notifier_info and struct
> fib_rt_info.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>

Reviewed-by: Ido Schimmel <idosch@nvidia.com>

Re: [PATCH net-next 3/5] netdevsim: Use dscp_t in struct nsim_fib4_rt

[David Ahern]

On 4/8/22 2:08 PM, Guillaume Nault wrote:
> Use the new dscp_t type to replace the tos field of struct
> nsim_fib4_rt. This ensures ECN bits are ignored and makes it compatible
> with the dscp fields of struct fib_entry_notifier_info and struct
> fib_rt_info.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>
> ---
>  drivers/net/netdevsim/fib.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>

[PATCH net-next 4/5] mlxsw: Use dscp_t in struct mlxsw_sp_fib4_entry

[Guillaume Nault]

Use the new dscp_t type to replace the tos field of struct
mlxsw_sp_fib4_entry. This ensures ECN bits are ignored and makes it
compatible with the dscp fields of fib_entry_notifier_info and
fib_rt_info.

This also allows sparse to flag potential incorrect uses of DSCP and
ECN bits.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c    | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 1c451d648302..dc820d9f2696 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -508,7 +508,7 @@ struct mlxsw_sp_fib4_entry {
 	struct mlxsw_sp_fib_entry common;
 	struct fib_info *fi;
 	u32 tb_id;
-	u8 tos;
+	dscp_t dscp;
 	u8 type;
 };
 
@@ -5560,7 +5560,7 @@ mlxsw_sp_fib4_entry_should_offload(const struct mlxsw_sp_fib_entry *fib_entry)
 
 	fib4_entry = container_of(fib_entry, struct mlxsw_sp_fib4_entry,
 				  common);
-	return !fib4_entry->tos;
+	return !fib4_entry->dscp;
 }
 
 static bool
@@ -5646,7 +5646,7 @@ mlxsw_sp_fib4_entry_hw_flags_set(struct mlxsw_sp *mlxsw_sp,
 	fri.tb_id = fib4_entry->tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = dst_len;
-	fri.dscp = inet_dsfield_to_dscp(fib4_entry->tos);
+	fri.dscp = fib4_entry->dscp;
 	fri.type = fib4_entry->type;
 	fri.offload = should_offload;
 	fri.trap = !should_offload;
@@ -5669,7 +5669,7 @@ mlxsw_sp_fib4_entry_hw_flags_clear(struct mlxsw_sp *mlxsw_sp,
 	fri.tb_id = fib4_entry->tb_id;
 	fri.dst = cpu_to_be32(*p_dst);
 	fri.dst_len = dst_len;
-	fri.dscp = inet_dsfield_to_dscp(fib4_entry->tos);
+	fri.dscp = fib4_entry->dscp;
 	fri.type = fib4_entry->type;
 	fri.offload = false;
 	fri.trap = false;
@@ -6251,7 +6251,7 @@ mlxsw_sp_fib4_entry_create(struct mlxsw_sp *mlxsw_sp,
 	fib_info_hold(fib4_entry->fi);
 	fib4_entry->tb_id = fen_info->tb_id;
 	fib4_entry->type = fen_info->type;
-	fib4_entry->tos = inet_dscp_to_dsfield(fen_info->dscp);
+	fib4_entry->dscp = fen_info->dscp;
 
 	fib_entry->fib_node = fib_node;
 
@@ -6305,7 +6305,7 @@ mlxsw_sp_fib4_entry_lookup(struct mlxsw_sp *mlxsw_sp,
 	fib4_entry = container_of(fib_node->fib_entry,
 				  struct mlxsw_sp_fib4_entry, common);
 	if (fib4_entry->tb_id == fen_info->tb_id &&
-	    fib4_entry->tos == inet_dscp_to_dsfield(fen_info->dscp) &&
+	    fib4_entry->dscp == fen_info->dscp &&
 	    fib4_entry->type == fen_info->type &&
 	    fib4_entry->fi == fen_info->fi)
 		return fib4_entry;
-- 
2.21.3

Re: [PATCH net-next 4/5] mlxsw: Use dscp_t in struct mlxsw_sp_fib4_entry

[Ido Schimmel]

On Fri, Apr 08, 2022 at 10:08:46PM +0200, Guillaume Nault wrote:
> Use the new dscp_t type to replace the tos field of struct
> mlxsw_sp_fib4_entry. This ensures ECN bits are ignored and makes it
> compatible with the dscp fields of fib_entry_notifier_info and
> fib_rt_info.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>

Reviewed-by: Ido Schimmel <idosch@nvidia.com>

[PATCH net-next 5/5] net: marvell: prestera: Use dscp_t in struct prestera_kern_fib_cache

[Guillaume Nault]

Use the new dscp_t type to replace the kern_tos field of struct
prestera_kern_fib_cache. This ensures ECN bits are ignored and makes it
compatible with the dscp fields of struct fib_entry_notifier_info and
struct fib_rt_info.

This also allows sparse to flag potential incorrect uses of DSCP and
ECN bits.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
---
 drivers/net/ethernet/marvell/prestera/prestera_router.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
index a6b608ade2b9..3754d8aec76d 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
@@ -27,7 +27,7 @@ struct prestera_kern_fib_cache {
 	/* Indicate if route is not overlapped by another table */
 	struct rhash_head ht_node; /* node of prestera_router */
 	struct fib_info *fi;
-	u8 kern_tos;
+	dscp_t kern_dscp;
 	u8 kern_type;
 	bool reachable;
 };
@@ -101,7 +101,7 @@ prestera_kern_fib_cache_create(struct prestera_switch *sw,
 	memcpy(&fib_cache->key, key, sizeof(*key));
 	fib_info_hold(fi);
 	fib_cache->fi = fi;
-	fib_cache->kern_tos = inet_dscp_to_dsfield(dscp);
+	fib_cache->kern_dscp = dscp;
 	fib_cache->kern_type = type;
 
 	err = rhashtable_insert_fast(&sw->router->kern_fib_cache_ht,
@@ -133,7 +133,7 @@ __prestera_k_arb_fib_lpm_offload_set(struct prestera_switch *sw,
 	fri.tb_id = fc->key.kern_tb_id;
 	fri.dst = fc->key.addr.u.ipv4;
 	fri.dst_len = fc->key.prefix_len;
-	fri.dscp = inet_dsfield_to_dscp(fc->kern_tos);
+	fri.dscp = fc->kern_dscp;
 	fri.type = fc->kern_type;
 	/* flags begin */
 	fri.offload = offload;
-- 
2.21.3

Re: [PATCH net-next 5/5] net: marvell: prestera: Use dscp_t in struct prestera_kern_fib_cache

[Yevhen Orlov]

On Fri, Apr 08, 2022 at 10:08:50PM +0200, Guillaume Nault wrote:
> Use the new dscp_t type to replace the kern_tos field of struct
> prestera_kern_fib_cache. This ensures ECN bits are ignored and makes it
> compatible with the dscp fields of struct fib_entry_notifier_info and
> struct fib_rt_info.
> 
> This also allows sparse to flag potential incorrect uses of DSCP and
> ECN bits.
> 
> Signed-off-by: Guillaume Nault <gnault@redhat.com>
> ---
>  drivers/net/ethernet/marvell/prestera/prestera_router.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

Reviewed-by: Yevhen Orlov <yevhen.orlov@plvision.eu>

Re: [PATCH net-next 0/5] ipv4: Convert several tos fields to dscp_t

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Fri, 8 Apr 2022 22:08:34 +0200 you wrote:
> Continue the work started with commit a410a0cf9885 ("ipv6: Define
> dscp_t and stop taking ECN bits into account in fib6-rules") and
> convert more structure fields and variables to dscp_t. This series
> focuses on struct fib_rt_info, struct fib_entry_notifier_info and their
> users (networking drivers).
> 
> The purpose of dscp_t is to ensure that ECN bits don't influence IP
> route lookups. It does so by ensuring that dscp_t variables have the
> ECN bits cleared.
> 
> [...]

Here is the summary with links:
  - [net-next,1/5] ipv4: Use dscp_t in struct fib_rt_info
    https://git.kernel.org/netdev/net-next/c/888ade8f90d7
  - [net-next,2/5] ipv4: Use dscp_t in struct fib_entry_notifier_info
    https://git.kernel.org/netdev/net-next/c/568a3f33b427
  - [net-next,3/5] netdevsim: Use dscp_t in struct nsim_fib4_rt
    https://git.kernel.org/netdev/net-next/c/20bbf32efe1e
  - [net-next,4/5] mlxsw: Use dscp_t in struct mlxsw_sp_fib4_entry
    https://git.kernel.org/netdev/net-next/c/046eabbf1991
  - [net-next,5/5] net: marvell: prestera: Use dscp_t in struct prestera_kern_fib_cache
    https://git.kernel.org/netdev/net-next/c/9f6982e9a3c2

You are awesome, thank you!
-- 
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