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Message-Id: <12358322832879-git-send-email-ilpo.jarvinen@helsinki.fi>
Date: Sat, 28 Feb 2009 16:44:38 +0200
From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org,
"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Subject: [PATCH net-next 13/17] tcp: kill eff_sacks "cache", the sole user can calculate itself
From: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
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@...sinki.fi>
---
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
--
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