This is a note to let you know that I've just added the patch titled

net/mlx5e: Avoid using the ipv6 stub in the TC offload neigh update path

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: net-mlx5e-avoid-using-the-ipv6-stub-in-the-tc-offload-neigh-update-path.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Tue Apr 10 23:20:08 CEST 2018

From: Or Gerlitz ogerlitz@mellanox.com Date: Tue, 13 Mar 2018 21:43:43 +0200 Subject: net/mlx5e: Avoid using the ipv6 stub in the TC offload neigh update path

From: Or Gerlitz ogerlitz@mellanox.com

[ Upstream commit 423c9db29943cfc43e3a408192e9efa4178af6a1 ]

Currently we use the global ipv6_stub var to access the ipv6 global nd table. This practice gets us to troubles when the stub is only partially set e.g when ipv6 is loaded under the disabled policy. In this case, as of commit 343d60aada5a ("ipv6: change ipv6_stub_impl.ipv6_dst_lookup to take net argument") the stub is not null, but stub->nd_tbl is and we crash.

As we can access the ipv6 nd_tbl directly, the fix is just to avoid the reference through the stub. There is one place in the code where we issue ipv6 route lookup and keep doing it through the stub, but that mentioned commit makes sure we get -EAFNOSUPPORT from the stack.

Fixes: 232c001398ae ("net/mlx5e: Add support to neighbour update flow") Signed-off-by: Or Gerlitz ogerlitz@mellanox.com Reviewed-by: Aviv Heller avivh@mellanox.com Signed-off-by: Saeed Mahameed saeedm@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 6 +++--- drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c @@ -230,7 +230,7 @@ void mlx5e_remove_sqs_fwd_rules(struct m static void mlx5e_rep_neigh_update_init_interval(struct mlx5e_rep_priv *rpriv) { #if IS_ENABLED(CONFIG_IPV6) - unsigned long ipv6_interval = NEIGH_VAR(&ipv6_stub->nd_tbl->parms, + unsigned long ipv6_interval = NEIGH_VAR(&nd_tbl.parms, DELAY_PROBE_TIME); #else unsigned long ipv6_interval = ~0UL; @@ -366,7 +366,7 @@ static int mlx5e_rep_netevent_event(stru case NETEVENT_NEIGH_UPDATE: n = ptr; #if IS_ENABLED(CONFIG_IPV6) - if (n->tbl != ipv6_stub->nd_tbl && n->tbl != &arp_tbl) + if (n->tbl != &nd_tbl && n->tbl != &arp_tbl) #else if (n->tbl != &arp_tbl) #endif @@ -414,7 +414,7 @@ static int mlx5e_rep_netevent_event(stru * done per device delay prob time parameter. */ #if IS_ENABLED(CONFIG_IPV6) - if (!p->dev || (p->tbl != ipv6_stub->nd_tbl && p->tbl != &arp_tbl)) + if (!p->dev || (p->tbl != &nd_tbl && p->tbl != &arp_tbl)) #else if (!p->dev || p->tbl != &arp_tbl) #endif --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c @@ -484,7 +484,7 @@ void mlx5e_tc_update_neigh_used_value(st tbl = &arp_tbl; #if IS_ENABLED(CONFIG_IPV6) else if (m_neigh->family == AF_INET6) - tbl = ipv6_stub->nd_tbl; + tbl = &nd_tbl; #endif else return;

Patches currently in stable-queue which might be from ogerlitz@mellanox.com are

queue-4.14/net-mlx5e-fix-memory-usage-issues-in-offloading-tc-flows.patch queue-4.14/net-mlx5e-fix-traffic-being-dropped-on-vf-representor.patch queue-4.14/net-mlx5e-avoid-using-the-ipv6-stub-in-the-tc-offload-neigh-update-path.patch queue-4.14/net-mlx5e-don-t-override-vport-admin-link-state-in-switchdev-mode.patch