tcp: add drop reason support to tcp_prune_ofo_queue()

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>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 9ff5557..ad15ad2 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -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

diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index eab0b09..73d7a6e 100644 (file)
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -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)                                   \

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 8a68785..a1077ad 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -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 &&