Patch "mlxsw: spectrum_router: Do not unconditionally clear route offload indication" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

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

    mlxsw: spectrum_router: Do not unconditionally clear route offload indication

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mlxsw-spectrum_router-do-not-unconditionally-clear-route-offload-indication.patch
and it can be found in the queue-4.15 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 Mar  6 19:02:56 PST 2018
From: Ido Schimmel <idosch@mellanox.com>
Date: Sat, 17 Feb 2018 00:30:44 +0100
Subject: mlxsw: spectrum_router: Do not unconditionally clear route offload indication

From: Ido Schimmel <idosch@mellanox.com>


[ Upstream commit d1c95af366961101819f07e3c64d44f3be7f0367 ]

When mlxsw replaces (or deletes) a route it removes the offload
indication from the replaced route. This is problematic for IPv4 routes,
as the offload indication is stored in the fib_info which is usually
shared between multiple routes.

Instead of unconditionally clearing the offload indication, only clear
it if no other route is using the fib_info.

Fixes: 3984d1a89fe7 ("mlxsw: spectrum_router: Provide offload indication using nexthop flags")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reported-by: Alexander Petrovskiy <alexpe@mellanox.com>
Tested-by: Alexander Petrovskiy <alexpe@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3765,6 +3765,9 @@ mlxsw_sp_fib4_entry_offload_unset(struct
 	struct mlxsw_sp_nexthop_group *nh_grp = fib_entry->nh_group;
 	int i;
 
+	if (!list_is_singular(&nh_grp->fib_list))
+		return;
+
 	for (i = 0; i < nh_grp->count; i++) {
 		struct mlxsw_sp_nexthop *nh = &nh_grp->nexthops[i];
 


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

queue-4.15/mlxsw-spectrum_router-fix-error-path-in-mlxsw_sp_vr_create.patch
queue-4.15/mlxsw-spectrum_router-do-not-unconditionally-clear-route-offload-indication.patch
queue-4.15/bridge-fix-vlan-reference-count-problem.patch
queue-4.15/net-ipv4-set-addr_type-in-hash_keys-for-forwarded-case.patch
queue-4.15/mlxsw-spectrum_switchdev-check-success-of-fdb-add-operation.patch