This is a note to let you know that I've just added the patch titled
mlx5: Don't accidentally set RTO_ONLINK before mlx5e_route_lookup_ipv4_get()
to the 5.16-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:
mlx5-don-t-accidentally-set-rto_onlink-before-mlx5e_route_lookup_ipv4_get.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 48d67543e01d73292e0bb66d3f10fc422e79e031 Mon Sep 17 00:00:00 2001
From: Guillaume Nault <gnault@xxxxxxxxxx>
Date: Mon, 10 Jan 2022 14:43:14 +0100
Subject: mlx5: Don't accidentally set RTO_ONLINK before mlx5e_route_lookup_ipv4_get()
From: Guillaume Nault <gnault@xxxxxxxxxx>
commit 48d67543e01d73292e0bb66d3f10fc422e79e031 upstream.
Mask the ECN bits before calling mlx5e_route_lookup_ipv4_get(). The
tunnel key might have the last ECN bit set. This interferes with the
route lookup process as ip_route_output_key_hash() interpretes this bit
specially (to restrict the route scope).
Found by code inspection, compile tested only.
Fixes: c7b9038d8af6 ("net/mlx5e: TC preparation refactoring for routing update event")
Fixes: 9a941117fb76 ("net/mlx5e: Maximize ip tunnel key usage on the TC offloading path")
Signed-off-by: Guillaume Nault <gnault@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
@@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/* Copyright (c) 2018 Mellanox Technologies. */
+#include <net/inet_ecn.h>
#include <net/vxlan.h>
#include <net/gre.h>
#include <net/geneve.h>
@@ -235,7 +236,7 @@ int mlx5e_tc_tun_create_header_ipv4(stru
int err;
/* add the IP fields */
- attr.fl.fl4.flowi4_tos = tun_key->tos;
+ attr.fl.fl4.flowi4_tos = tun_key->tos & ~INET_ECN_MASK;
attr.fl.fl4.daddr = tun_key->u.ipv4.dst;
attr.fl.fl4.saddr = tun_key->u.ipv4.src;
attr.ttl = tun_key->ttl;
@@ -350,7 +351,7 @@ int mlx5e_tc_tun_update_header_ipv4(stru
int err;
/* add the IP fields */
- attr.fl.fl4.flowi4_tos = tun_key->tos;
+ attr.fl.fl4.flowi4_tos = tun_key->tos & ~INET_ECN_MASK;
attr.fl.fl4.daddr = tun_key->u.ipv4.dst;
attr.fl.fl4.saddr = tun_key->u.ipv4.src;
attr.ttl = tun_key->ttl;
Patches currently in stable-queue which might be from gnault@xxxxxxxxxx are
queue-5.16/mlx5-don-t-accidentally-set-rto_onlink-before-mlx5e_route_lookup_ipv4_get.patch
queue-5.16/ppp-ensure-minimum-packet-size-in-ppp_write.patch
