Per discussion with Daniel[1] and Eric[2], the SOCK_DEBUG() is a very ancient interface, which is not very useful for debugging. So we'd better clean up it.
This patch cleans up it for TCP. [1] https://patchwork.ozlabs.org/patch/1035573/ [2] https://patchwork.ozlabs.org/patch/1040533/ Signed-off-by: Yafang Shao <laoar.s...@gmail.com> --- net/ipv4/tcp_input.c | 19 +------------------ net/ipv6/tcp_ipv6.c | 2 -- 2 files changed, 1 insertion(+), 20 deletions(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 7a027dec..6d2750e 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3595,7 +3595,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag) * this segment (RFC793 Section 3.9). */ if (after(ack, tp->snd_nxt)) - goto invalid_ack; + return -1; if (after(ack, prior_snd_una)) { flag |= FLAG_SND_UNA_ADVANCED; @@ -3714,10 +3714,6 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag) tcp_process_tlp_ack(sk, ack, flag); return 1; -invalid_ack: - SOCK_DEBUG(sk, "Ack %u after %u:%u\n", ack, tp->snd_una, tp->snd_nxt); - return -1; - old_ack: /* If data was SACKed, tag it and see if we should send more data. * If data was DSACKed, see if we can undo a cwnd reduction. @@ -3731,7 +3727,6 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag) tcp_xmit_recovery(sk, rexmit); } - SOCK_DEBUG(sk, "Ack %u before %u:%u\n", ack, tp->snd_una, tp->snd_nxt); return 0; } @@ -4432,13 +4427,9 @@ static void tcp_ofo_queue(struct sock *sk) rb_erase(&skb->rbnode, &tp->out_of_order_queue); if (unlikely(!after(TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt))) { - SOCK_DEBUG(sk, "ofo packet was already received\n"); tcp_drop(sk, skb); continue; } - SOCK_DEBUG(sk, "ofo requeuing : rcv_next %X seq %X - %X\n", - tp->rcv_nxt, TCP_SKB_CB(skb)->seq, - TCP_SKB_CB(skb)->end_seq); tail = skb_peek_tail(&sk->sk_receive_queue); eaten = tail && tcp_try_coalesce(sk, tail, skb, &fragstolen); @@ -4502,8 +4493,6 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb) NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPOFOQUEUE); seq = TCP_SKB_CB(skb)->seq; end_seq = TCP_SKB_CB(skb)->end_seq; - SOCK_DEBUG(sk, "out of order segment: rcv_next %X seq %X - %X\n", - tp->rcv_nxt, seq, end_seq); p = &tp->out_of_order_queue.rb_node; if (RB_EMPTY_ROOT(&tp->out_of_order_queue)) { @@ -4779,10 +4768,6 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb) if (before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt)) { /* Partial packet, seq < rcv_next < end_seq */ - SOCK_DEBUG(sk, "partial packet: rcv_next %X seq %X - %X\n", - tp->rcv_nxt, TCP_SKB_CB(skb)->seq, - TCP_SKB_CB(skb)->end_seq); - tcp_dsack_set(sk, TCP_SKB_CB(skb)->seq, tp->rcv_nxt); /* If window is closed, drop tail of packet. But after @@ -5061,8 +5046,6 @@ static int tcp_prune_queue(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); - SOCK_DEBUG(sk, "prune_queue: c=%x\n", tp->copied_seq); - NET_INC_STATS(sock_net(sk), LINUX_MIB_PRUNECALLED); if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index e51cda7..57ef69a1 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -220,8 +220,6 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, u32 exthdrlen = icsk->icsk_ext_hdr_len; struct sockaddr_in sin; - SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); - if (__ipv6_only_sock(sk)) return -ENETUNREACH; -- 1.8.3.1
