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tcp: add drop reason support to tcp_prune_ofo_queue()

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Add one reason for packets dropped from OFO queue because
of memory pressure.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-04-15 17:10:45 -07:00 committed by David S. Miller
parent 4b506af9c5
commit e7c89ae407
3 changed files with 5 additions and 1 deletions
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1
include/linux/skbuff.h
View File

@ -392,6 +392,7 @@ enum skb_drop_reason {
SKB_DROP_REASON_TCP_OLD_ACK, /* TCP ACK is old, but in window */
SKB_DROP_REASON_TCP_TOO_OLD_ACK, /* TCP ACK is too old */
SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, /* TCP ACK for data we haven't sent yet */
SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, /* pruned from TCP OFO queue */
SKB_DROP_REASON_IP_OUTNOROUTES, /* route lookup failed */
SKB_DROP_REASON_BPF_CGROUP_EGRESS, /* dropped by
* BPF_PROG_TYPE_CGROUP_SKB

2
include/trace/events/skb.h
View File

@ -48,6 +48,8 @@
EM(SKB_DROP_REASON_TCP_TOO_OLD_ACK, TCP_TOO_OLD_ACK) \
EM(SKB_DROP_REASON_TCP_ACK_UNSENT_DATA, \
TCP_ACK_UNSENT_DATA) \
EM(SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE, \
TCP_OFO_QUEUE_PRUNE) \
EM(SKB_DROP_REASON_IP_OUTNOROUTES, IP_OUTNOROUTES) \
EM(SKB_DROP_REASON_BPF_CGROUP_EGRESS, \
BPF_CGROUP_EGRESS) \

3
net/ipv4/tcp_input.c
View File

@ -5334,7 +5334,8 @@ static bool tcp_prune_ofo_queue(struct sock *sk)
prev = rb_prev(node);
rb_erase(node, &tp->out_of_order_queue);
goal -= rb_to_skb(node)->truesize;
tcp_drop(sk, rb_to_skb(node));
tcp_drop_reason(sk, rb_to_skb(node),
SKB_DROP_REASON_TCP_OFO_QUEUE_PRUNE);
if (!prev || goal <= 0) {
sk_mem_reclaim(sk);
if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf &&