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d0d3e9c286
Some network drivers assume this field is zero after napi_get_frags().
We must clear it in napi_reuse_skb() otherwise the following can happen:
1) A packet is received, and skb_shinfo(skb)->hwtstamps is populated
because a bit in the receive descriptor announced hwtstamp
availability for this packet.
2) Packet is given to gro layer via napi_gro_frags().
3) Packet is merged to a prior one held in GRO queues.
4) skb is saved after some cleanup in napi->skb via a call
to napi_reuse_skb().
5) Next packet is received 10 seconds later, gets the recycled skb
from napi_get_frags().
6) The receive descriptor does not announce hwtstamp availability.
Driver does not clear shinfo->hwtstamps.
7) We have in shinfo->hwtstamps an old timestamp.
Fixes: ac45f602ee ("net: infrastructure for hardware time stamping")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://patch.msgid.link/20251015063221.4171986-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
835 lines
20 KiB
835 lines
20 KiB