[PATCH net-next 13/17] tcp: kill eff_sacks "cache", the sole user can calculate itself
From: Ilpo Järvinen <hidden>
Date: 2009-02-28 14:44:53
Subsystem:
networking [general], networking [tcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
From: Ilpo Järvinen <redacted> Also fixes insignificant bug that would cause sending of stale SACK block (would occur in some corner cases). Signed-off-by: Ilpo Järvinen <redacted> --- include/linux/tcp.h | 1 - include/net/tcp.h | 1 - net/ipv4/tcp_input.c | 15 ++------------- net/ipv4/tcp_minisocks.c | 3 +-- net/ipv4/tcp_output.c | 12 ++++++------ 5 files changed, 9 insertions(+), 23 deletions(-)
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 0cd99e6..4b86ad7 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h@@ -218,7 +218,6 @@ struct tcp_options_received { snd_wscale : 4, /* Window scaling received from sender */ rcv_wscale : 4; /* Window scaling to send to receiver */ /* SACKs data */ - u8 eff_sacks; /* Size of SACK array to send with next packet */ u8 num_sacks; /* Number of SACK blocks */ u16 user_mss; /* mss requested by user in ioctl */ u16 mss_clamp; /* Maximal mss, negotiated at connection setup */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 0366a55..055e494 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h@@ -926,7 +926,6 @@ extern void tcp_done(struct sock *sk); static inline void tcp_sack_reset(struct tcp_options_received *rx_opt) { rx_opt->dsack = 0; - rx_opt->eff_sacks = 0; rx_opt->num_sacks = 0; }
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 03f5ede..e4442a2 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 f67effb..bb3d8b3 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 61445b5..1555bb7 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. */
--
1.5.6.5