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net: tcp: use tcp_drop_reason() for tcp_data_queue_ofo() 

Replace tcp_drop() used in tcp_data_queue_ofo with tcp_drop_reason().
Following drop reasons are introduced:

SKB_DROP_REASON_TCP_OFOMERGE

Reviewed-by: Mengen Sun <mengensun@tencent.com>
Reviewed-by: Hao Peng <flyingpeng@tencent.com>
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Menglong Dong 2022-02-20 15:06:37 +08:00 committed by David S. Miller
parent a7ec381049
commit d25e481be0
3 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/skbuff.h
View File

@ -376,6 +376,10 @@ enum skb_drop_reason {
* the right edges of receive
* window
*/
SKB_DROP_REASON_TCP_OFOMERGE, /* the data of skb is already in
* the ofo queue, corresponding to
* LINUX_MIB_TCPOFOMERGE
*/
SKB_DROP_REASON_MAX,
};

1
include/trace/events/skb.h
View File

@ -36,6 +36,7 @@
EM(SKB_DROP_REASON_TCP_ZEROWINDOW, TCP_ZEROWINDOW) \
EM(SKB_DROP_REASON_TCP_OLD_DATA, TCP_OLD_DATA) \
EM(SKB_DROP_REASON_TCP_OVERWINDOW, TCP_OVERWINDOW) \
EM(SKB_DROP_REASON_TCP_OFOMERGE, TCP_OFOMERGE) \
EMe(SKB_DROP_REASON_MAX, MAX)
#undef EM

10
net/ipv4/tcp_input.c
View File

@ -4779,7 +4779,7 @@ 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(sock_net(sk), LINUX_MIB_TCPOFODROP);
sk->sk_data_ready(sk);
tcp_drop(sk, skb);
tcp_drop_reason(sk, skb, SKB_DROP_REASON_PROTO_MEM);
return;
}
@ -4842,7 +4842,8 @@ coalesce_done:
/* All the bits are present. Drop. */
NET_INC_STATS(sock_net(sk),
LINUX_MIB_TCPOFOMERGE);
tcp_drop(sk, skb);
tcp_drop_reason(sk, skb,
SKB_DROP_REASON_TCP_OFOMERGE);
skb = NULL;
tcp_dsack_set(sk, seq, end_seq);
goto add_sack;
@ -4861,7 +4862,8 @@ coalesce_done:
TCP_SKB_CB(skb1)->end_seq);
NET_INC_STATS(sock_net(sk),
LINUX_MIB_TCPOFOMERGE);
tcp_drop(sk, skb1);
tcp_drop_reason(sk, skb1,
SKB_DROP_REASON_TCP_OFOMERGE);
goto merge_right;
}
} else if (tcp_ooo_try_coalesce(sk, skb1,
@ -4889,7 +4891,7 @@ merge_right:
tcp_dsack_extend(sk, TCP_SKB_CB(skb1)->seq,
TCP_SKB_CB(skb1)->end_seq);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPOFOMERGE);
tcp_drop(sk, skb1);
tcp_drop_reason(sk, skb1, SKB_DROP_REASON_TCP_OFOMERGE);
}
/* If there is no skb after us, we are the last_skb ! */
if (!skb1)