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tcp: increment sk_drops for dropped rx packets

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Now ss can report sk_drops, we can instruct TCP to increment
this per socket counter when it drops an incoming frame, to refine
monitoring and debugging.

Following patch takes care of listeners drops.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-04-01 08:52:19 -07:00 committed by David S. Miller
parent 15239302ed
commit 532182cd61
4 changed files with 29 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/net/sock.h
View File

@ -2012,6 +2012,13 @@ sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb)
SOCK_SKB_CB(skb)->dropcount = atomic_read(&sk->sk_drops);
}
static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb)
{
int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs);
atomic_add(segs, &sk->sk_drops);
}
void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb);
void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,

33
net/ipv4/tcp_input.c
View File

@ -4307,6 +4307,12 @@ static bool tcp_try_coalesce(struct sock *sk,
return true;
}
static void tcp_drop(struct sock *sk, struct sk_buff *skb)
{
sk_drops_add(sk, skb);
__kfree_skb(skb);
}
/* This one checks to see if we can put data from the
* out_of_order queue into the receive_queue.
*/
@ -4331,7 +4337,7 @@ static void tcp_ofo_queue(struct sock *sk)
__skb_unlink(skb, &tp->out_of_order_queue);
if (!after(TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt)) {
SOCK_DEBUG(sk, "ofo packet was already received\n");
__kfree_skb(skb);
tcp_drop(sk, skb);
continue;
}
SOCK_DEBUG(sk, "ofo requeuing : rcv_next %X seq %X - %X\n",
@ -4383,7 +4389,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
if (unlikely(tcp_try_rmem_schedule(sk, skb, skb->truesize))) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPOFODROP);
__kfree_skb(skb);
tcp_drop(sk, skb);
return;
}
@ -4447,7 +4453,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
if (!after(end_seq, TCP_SKB_CB(skb1)->end_seq)) {
/* All the bits are present. Drop. */
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPOFOMERGE);
__kfree_skb(skb);
tcp_drop(sk, skb);
skb = NULL;
tcp_dsack_set(sk, seq, end_seq);
goto add_sack;
@ -4486,7 +4492,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
tcp_dsack_extend(sk, TCP_SKB_CB(skb1)->seq,
TCP_SKB_CB(skb1)->end_seq);
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPOFOMERGE);
__kfree_skb(skb1);
tcp_drop(sk, skb1);
}
add_sack:
@ -4569,12 +4575,13 @@ err:
static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
int eaten = -1;
bool fragstolen = false;
int eaten = -1;
if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq)
goto drop;
if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq) {
__kfree_skb(skb);
return;
}
skb_dst_drop(skb);
__skb_pull(skb, tcp_hdr(skb)->doff * 4);
@ -4656,7 +4663,7 @@ out_of_window:
tcp_enter_quickack_mode(sk);
inet_csk_schedule_ack(sk);
drop:
__kfree_skb(skb);
tcp_drop(sk, skb);
return;
}
@ -5233,7 +5240,7 @@ syn_challenge:
return true;
discard:
__kfree_skb(skb);
tcp_drop(sk, skb);
return false;
}
@ -5451,7 +5458,7 @@ csum_error:
TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
discard:
__kfree_skb(skb);
tcp_drop(sk, skb);
}
EXPORT_SYMBOL(tcp_rcv_established);
@ -5682,7 +5689,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
TCP_DELACK_MAX, TCP_RTO_MAX);
discard:
__kfree_skb(skb);
tcp_drop(sk, skb);
return 0;
} else {
tcp_send_ack(sk);
@ -6043,7 +6050,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
if (!queued) {
discard:
__kfree_skb(skb);
tcp_drop(sk, skb);
}
return 0;
}

1
net/ipv4/tcp_ipv4.c
View File

@ -1694,6 +1694,7 @@ discard_it:
return 0;
discard_and_relse:
sk_drops_add(sk, skb);
if (refcounted)
sock_put(sk);
goto discard_it;

1
net/ipv6/tcp_ipv6.c
View File

@ -1484,6 +1484,7 @@ discard_it:
return 0;
discard_and_relse:
sk_drops_add(sk, skb);
if (refcounted)
sock_put(sk);
goto discard_it;