diff options
author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2009-02-28 04:44:38 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-03-02 03:00:16 -0800 |
commit | cabeccbd172cc305f4383f5a4808ae254745275f (patch) | |
tree | 0504d469ae4fc1a6c1ba368b3cc99ae7f55520cb /net/ipv4 | |
parent | 758ce5c8d11d6fc57fe5f1dbc237aa8ff6386eac (diff) | |
download | linux-cabeccbd172cc305f4383f5a4808ae254745275f.tar.gz linux-cabeccbd172cc305f4383f5a4808ae254745275f.tar.bz2 linux-cabeccbd172cc305f4383f5a4808ae254745275f.zip |
tcp: kill eff_sacks "cache", the sole user can calculate itself
Also fixes insignificant bug that would cause sending of stale
SACK block (would occur in some corner cases).
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r-- | net/ipv4/tcp_input.c | 15 | ||||
-rw-r--r-- | net/ipv4/tcp_minisocks.c | 3 | ||||
-rw-r--r-- | net/ipv4/tcp_output.c | 12 |
3 files changed, 9 insertions, 21 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 03f5ede87224..e4442a293eb0 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -4099,7 +4099,6 @@ static void tcp_dsack_set(struct sock *sk, u32 seq, u32 end_seq) tp->rx_opt.dsack = 1; tp->duplicate_sack[0].start_seq = seq; tp->duplicate_sack[0].end_seq = end_seq; - tp->rx_opt.eff_sacks = tp->rx_opt.num_sacks + 1; } } @@ -4154,8 +4153,6 @@ static void tcp_sack_maybe_coalesce(struct tcp_sock *tp) * Decrease num_sacks. */ tp->rx_opt.num_sacks--; - tp->rx_opt.eff_sacks = tp->rx_opt.num_sacks + - tp->rx_opt.dsack; for (i = this_sack; i < tp->rx_opt.num_sacks; i++) sp[i] = sp[i + 1]; continue; @@ -4218,7 +4215,6 @@ new_sack: sp->start_seq = seq; sp->end_seq = end_seq; tp->rx_opt.num_sacks++; - tp->rx_opt.eff_sacks = tp->rx_opt.num_sacks + tp->rx_opt.dsack; } /* RCV.NXT advances, some SACKs should be eaten. */ @@ -4232,7 +4228,6 @@ static void tcp_sack_remove(struct tcp_sock *tp) /* Empty ofo queue, hence, all the SACKs are eaten. Clear. */ if (skb_queue_empty(&tp->out_of_order_queue)) { tp->rx_opt.num_sacks = 0; - tp->rx_opt.eff_sacks = tp->rx_opt.dsack; return; } @@ -4253,11 +4248,8 @@ static void tcp_sack_remove(struct tcp_sock *tp) this_sack++; sp++; } - if (num_sacks != tp->rx_opt.num_sacks) { + if (num_sacks != tp->rx_opt.num_sacks) tp->rx_opt.num_sacks = num_sacks; - tp->rx_opt.eff_sacks = tp->rx_opt.num_sacks + - tp->rx_opt.dsack; - } } /* This one checks to see if we can put data from the @@ -4333,10 +4325,8 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb) TCP_ECN_accept_cwr(tp, skb); - if (tp->rx_opt.dsack) { + if (tp->rx_opt.dsack) tp->rx_opt.dsack = 0; - tp->rx_opt.eff_sacks = tp->rx_opt.num_sacks; - } /* Queue data for delivery to the user. * Packets in sequence go to the receive queue. @@ -4456,7 +4446,6 @@ drop: if (tcp_is_sack(tp)) { tp->rx_opt.num_sacks = 1; tp->rx_opt.dsack = 0; - tp->rx_opt.eff_sacks = 1; tp->selective_acks[0].start_seq = TCP_SKB_CB(skb)->seq; tp->selective_acks[0].end_seq = TCP_SKB_CB(skb)->end_seq; diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index f67effbb102b..bb3d8b35f19a 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -434,9 +434,8 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req, newtp->rx_opt.saw_tstamp = 0; newtp->rx_opt.dsack = 0; - newtp->rx_opt.eff_sacks = 0; - newtp->rx_opt.num_sacks = 0; + newtp->urg_data = 0; if (sock_flag(newsk, SOCK_KEEPOPEN)) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 61445b57610c..1555bb73b638 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -441,10 +441,8 @@ static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp, *ptr++ = htonl(sp[this_sack].end_seq); } - if (tp->rx_opt.dsack) { + if (tp->rx_opt.dsack) tp->rx_opt.dsack = 0; - tp->rx_opt.eff_sacks = tp->rx_opt.num_sacks; - } } } @@ -550,6 +548,7 @@ static unsigned tcp_established_options(struct sock *sk, struct sk_buff *skb, struct tcp_skb_cb *tcb = skb ? TCP_SKB_CB(skb) : NULL; struct tcp_sock *tp = tcp_sk(sk); unsigned size = 0; + unsigned int eff_sacks; #ifdef CONFIG_TCP_MD5SIG *md5 = tp->af_specific->md5_lookup(sk, sk); @@ -568,10 +567,11 @@ static unsigned tcp_established_options(struct sock *sk, struct sk_buff *skb, size += TCPOLEN_TSTAMP_ALIGNED; } - if (unlikely(tp->rx_opt.eff_sacks)) { + eff_sacks = tp->rx_opt.num_sacks + tp->rx_opt.dsack; + if (unlikely(eff_sacks)) { const unsigned remaining = MAX_TCP_OPTION_SPACE - size; opts->num_sack_blocks = - min_t(unsigned, tp->rx_opt.eff_sacks, + min_t(unsigned, eff_sacks, (remaining - TCPOLEN_SACK_BASE_ALIGNED) / TCPOLEN_SACK_PERBLOCK); size += TCPOLEN_SACK_BASE_ALIGNED + @@ -1418,7 +1418,7 @@ static int tcp_mtu_probe(struct sock *sk) icsk->icsk_mtup.probe_size || inet_csk(sk)->icsk_ca_state != TCP_CA_Open || tp->snd_cwnd < 11 || - tp->rx_opt.eff_sacks) + tp->rx_opt.num_sacks || tp->rx_opt.dsack) return -1; /* Very simple search strategy: just double the MSS. */ |