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authorYafang Shao <laoar.shao@gmail.com>2018-06-28 00:22:56 -0400
committerDavid S. Miller <davem@davemloft.net>2018-06-30 18:43:53 +0900
commitea5d0c32498e1a08ff5f3dbeafa4d74895851b0d (patch)
tree75f4e63b128510f799324bc81ce59fedb930ffb1 /net/ipv4/tcp_input.c
parentbnx2x: Mark expected switch fall-throughs (diff)
downloadlinux-dev-ea5d0c32498e1a08ff5f3dbeafa4d74895851b0d.tar.xz
linux-dev-ea5d0c32498e1a08ff5f3dbeafa4d74895851b0d.zip
tcp: add new SNMP counter for drops when try to queue in rcv queue
When sk_rmem_alloc is larger than the receive buffer and we can't schedule more memory for it, the skb will be dropped. In above situation, if this skb is put into the ofo queue, LINUX_MIB_TCPOFODROP is incremented to track it. While if this skb is put into the receive queue, there's no record. So a new SNMP counter is introduced to track this behavior. LINUX_MIB_TCPRCVQDROP: Number of packets meant to be queued in rcv queue but dropped because socket rcvbuf limit hit. Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 9c5b3415413f..eecd359595fc 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4611,8 +4611,10 @@ int tcp_send_rcvq(struct sock *sk, struct msghdr *msg, size_t size)
skb->data_len = data_len;
skb->len = size;
- if (tcp_try_rmem_schedule(sk, skb, skb->truesize))
+ if (tcp_try_rmem_schedule(sk, skb, skb->truesize)) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRCVQDROP);
goto err_free;
+ }
err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, size);
if (err)
@@ -4677,8 +4679,10 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
queue_and_out:
if (skb_queue_len(&sk->sk_receive_queue) == 0)
sk_forced_mem_schedule(sk, skb->truesize);
- else if (tcp_try_rmem_schedule(sk, skb, skb->truesize))
+ else if (tcp_try_rmem_schedule(sk, skb, skb->truesize)) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRCVQDROP);
goto drop;
+ }
eaten = tcp_queue_rcv(sk, skb, 0, &fragstolen);
tcp_rcv_nxt_update(tp, TCP_SKB_CB(skb)->end_seq);