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authorAmit Cohen <amcohen@nvidia.com>2021-02-07 11:22:50 +0300
committerDavid S. Miller <davem@davemloft.net>2021-02-09 03:47:03 +0300
commit36c5100e859d93b3436ae24810612b05addb1e89 (patch)
treefa897bf9873f7ab900fdbd699ce449948f45fdc5
parent49fc251360a10e6bff0d886c9e3c62008a1c4caf (diff)
downloadlinux-36c5100e859d93b3436ae24810612b05addb1e89.tar.xz
IPv4: Add "offload failed" indication to routes
After installing a route to the kernel, user space receives an acknowledgment, which means the route was installed in the kernel, but not necessarily in hardware. The asynchronous nature of route installation in hardware can lead to a routing daemon advertising a route before it was actually installed in hardware. This can result in packet loss or mis-routed packets until the route is installed in hardware. To avoid such cases, previous patch set added the ability to emit RTM_NEWROUTE notifications whenever RTM_F_OFFLOAD/RTM_F_TRAP flags are changed, this behavior is controlled by sysctl. With the above mentioned behavior, it is possible to know from user-space if the route was offloaded, but if the offload fails there is no indication to user-space. Following a failure, a routing daemon will wait indefinitely for a notification that will never come. This patch adds an "offload_failed" indication to IPv4 routes, so that users will have better visibility into the offload process. 'struct fib_alias', and 'struct fib_rt_info' are extended with new field that indicates if route offload failed. Note that the new field is added using unused bit and therefore there is no need to increase structs size. Signed-off-by: Amit Cohen <amcohen@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c2
-rw-r--r--drivers/net/netdevsim/fib.c1
-rw-r--r--include/net/ip_fib.h3
-rw-r--r--net/ipv4/fib_lookup.h3
-rw-r--r--net/ipv4/fib_semantics.c3
-rw-r--r--net/ipv4/fib_trie.c7
-rw-r--r--net/ipv4/route.c1
7 files changed, 17 insertions, 3 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index cf111e73f81e..ac9a174372cc 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -4963,6 +4963,7 @@ mlxsw_sp_fib4_entry_hw_flags_set(struct mlxsw_sp *mlxsw_sp,
fri.type = fib4_entry->type;
fri.offload = should_offload;
fri.trap = !should_offload;
+ fri.offload_failed = false;
fib_alias_hw_flags_set(mlxsw_sp_net(mlxsw_sp), &fri);
}
@@ -4985,6 +4986,7 @@ mlxsw_sp_fib4_entry_hw_flags_clear(struct mlxsw_sp *mlxsw_sp,
fri.type = fib4_entry->type;
fri.offload = false;
fri.trap = false;
+ fri.offload_failed = false;
fib_alias_hw_flags_set(mlxsw_sp_net(mlxsw_sp), &fri);
}
diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c
index 1779146926a5..ca19da169853 100644
--- a/drivers/net/netdevsim/fib.c
+++ b/drivers/net/netdevsim/fib.c
@@ -319,6 +319,7 @@ static void nsim_fib4_rt_hw_flags_set(struct net *net,
fri.type = fib4_rt->type;
fri.offload = false;
fri.trap = trap;
+ fri.offload_failed = false;
fib_alias_hw_flags_set(net, &fri);
}
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 2ec062aaa978..a914f33f3ed5 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -213,7 +213,8 @@ struct fib_rt_info {
u8 type;
u8 offload:1,
trap:1,
- unused:6;
+ offload_failed:1,
+ unused:5;
};
struct fib_entry_notifier_info {
diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h
index aff454ef0fa3..b58db1ca4bfb 100644
--- a/net/ipv4/fib_lookup.h
+++ b/net/ipv4/fib_lookup.h
@@ -18,7 +18,8 @@ struct fib_alias {
s16 fa_default;
u8 offload:1,
trap:1,
- unused:6;
+ offload_failed:1,
+ unused:5;
struct rcu_head rcu;
};
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 4c38facf91c0..a632b66bc13a 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -521,6 +521,7 @@ void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
fri.type = fa->fa_type;
fri.offload = fa->offload;
fri.trap = fa->trap;
+ fri.offload_failed = fa->offload_failed;
err = fib_dump_info(skb, info->portid, seq, event, &fri, nlm_flags);
if (err < 0) {
/* -EMSGSIZE implies BUG in fib_nlmsg_size() */
@@ -1811,6 +1812,8 @@ offload:
rtm->rtm_flags |= RTM_F_OFFLOAD;
if (fri->trap)
rtm->rtm_flags |= RTM_F_TRAP;
+ if (fri->offload_failed)
+ rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED;
nlmsg_end(skb, nlh);
return 0;
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 60559b708158..80147caa9bfd 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1047,11 +1047,13 @@ void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri)
if (!fa_match)
goto out;
- if (fa_match->offload == fri->offload && fa_match->trap == fri->trap)
+ if (fa_match->offload == fri->offload && fa_match->trap == fri->trap &&
+ fa_match->offload_failed == fri->offload_failed)
goto out;
fa_match->offload = fri->offload;
fa_match->trap = fri->trap;
+ fa_match->offload_failed = fri->offload_failed;
if (!net->ipv4.sysctl_fib_notify_on_flag_change)
goto out;
@@ -1290,6 +1292,7 @@ int fib_table_insert(struct net *net, struct fib_table *tb,
new_fa->fa_default = -1;
new_fa->offload = 0;
new_fa->trap = 0;
+ new_fa->offload_failed = 0;
hlist_replace_rcu(&fa->fa_list, &new_fa->fa_list);
@@ -1350,6 +1353,7 @@ int fib_table_insert(struct net *net, struct fib_table *tb,
new_fa->fa_default = -1;
new_fa->offload = 0;
new_fa->trap = 0;
+ new_fa->offload_failed = 0;
/* Insert new entry to the list. */
err = fib_insert_alias(t, tp, l, new_fa, fa, key);
@@ -2289,6 +2293,7 @@ static int fn_trie_dump_leaf(struct key_vector *l, struct fib_table *tb,
fri.type = fa->fa_type;
fri.offload = fa->offload;
fri.trap = fa->trap;
+ fri.offload_failed = fa->offload_failed;
err = fib_dump_info(skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index be31e2446470..02d81d79deeb 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3304,6 +3304,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
fri.type = rt->rt_type;
fri.offload = 0;
fri.trap = 0;
+ fri.offload_failed = 0;
if (res.fa_head) {
struct fib_alias *fa;