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af_packet: do not call packet_read_pending() from tpacket_destruct_skb()

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[ Upstream commit 581073f626e387d3e7eed55c48c8495584ead7ba ]

trafgen performance considerably sank on hosts with many cores
after the blamed commit.

packet_read_pending() is very expensive, and calling it
in af_packet fast path defeats Daniel intent in commit
b013840810c2 ("packet: use percpu mmap tx frame pending refcount")

tpacket_destruct_skb() makes room for one packet, we can immediately
wakeup a producer, no need to completely drain the tx ring.

Fixes: 89ed5b519004 ("af_packet: Block execution of tasks waiting for transmit to complete in AF_PACKET")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20240515163358.4105915-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 4f3ae7d846b4565c0b80d65ed607c3277bc984d4)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
Eric Dumazet 2024-05-15 16:33:58 +00:00 committed by Vegard Nossum
parent 08f41b353c
commit 79417a25cb
1 changed files with 1 additions and 2 deletions
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3
net/packet/af_packet.c
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@ -2480,8 +2480,7 @@ static void tpacket_destruct_skb(struct sk_buff *skb)
ts = __packet_set_timestamp(po, ph, skb);
__packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
if (!packet_read_pending(&po->tx_ring))
complete(&po->skb_completion);
complete(&po->skb_completion);
}
sock_wfree(skb);