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authorVictor Nogueira <victor@mojatatu.com>2023-04-26 15:19:40 +0000
committerDavid S. Miller <davem@davemloft.net>2023-05-01 07:26:10 +0100
commit526f28bd0fbdc699cda31426928802650c1528e5 (patch)
tree2e1da3bd60b2f966714236885d8eb965bc130bb4 /net/sched/act_mirred.c
parent6686317855c6997671982d4489ccdd946f644957 (diff)
net/sched: act_mirred: Add carrier check
There are cases where the device is adminstratively UP, but operationally down. For example, we have a physical device (Nvidia ConnectX-6 Dx, 25Gbps) who's cable was pulled out, here is its ip link output: 5: ens2f1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000 link/ether b8:ce:f6:4b:68:35 brd ff:ff:ff:ff:ff:ff altname enp179s0f1np1 As you can see, it's administratively UP but operationally down. In this case, sending a packet to this port caused a nasty kernel hang (so nasty that we were unable to capture it). Aborting a transmit based on operational status (in addition to administrative status) fixes the issue. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Victor Nogueira <victor@mojatatu.com> v1->v2: Add fixes tag v2->v3: Remove blank line between tags + add change log, suggested by Leon Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/act_mirred.c')
-rw-r--r--net/sched/act_mirred.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index ec43764e92e7..0a711c184c29 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -264,7 +264,7 @@ TC_INDIRECT_SCOPE int tcf_mirred_act(struct sk_buff *skb,
goto out;
}
- if (unlikely(!(dev->flags & IFF_UP))) {
+ if (unlikely(!(dev->flags & IFF_UP)) || !netif_carrier_ok(dev)) {
net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
dev->name);
goto out;