summaryrefslogtreecommitdiffstats
path: root/net/ipv4/tcp_output.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c75
1 files changed, 58 insertions, 17 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 5dd6dd7d091e..029c70dfb585 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -190,7 +190,7 @@ void tcp_select_initial_window(int __space, __u32 mss,
}
/* Set initial window to value enough for senders,
- * following RFC1414. Senders, not following this RFC,
+ * following RFC2414. Senders, not following this RFC,
* will be satisfied with 2.
*/
if (mss > (1<<*rcv_wscale)) {
@@ -435,8 +435,9 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss
int nsize, old_factor;
u16 flags;
- BUG_ON(len >= skb->len);
+ BUG_ON(len > skb->len);
+ clear_all_retrans_hints(tp);
nsize = skb_headlen(skb) - len;
if (nsize < 0)
nsize = 0;
@@ -509,7 +510,16 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss
tp->lost_out -= diff;
tp->left_out -= diff;
}
+
if (diff > 0) {
+ /* Adjust Reno SACK estimate. */
+ if (!tp->rx_opt.sack_ok) {
+ tp->sacked_out -= diff;
+ if ((int)tp->sacked_out < 0)
+ tp->sacked_out = 0;
+ tcp_sync_left_out(tp);
+ }
+
tp->fackets_out -= diff;
if ((int)tp->fackets_out < 0)
tp->fackets_out = 0;
@@ -591,7 +601,7 @@ int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len)
for TCP options, but includes only bare TCP header.
tp->rx_opt.mss_clamp is mss negotiated at connection setup.
- It is minumum of user_mss and mss received with SYN.
+ It is minimum of user_mss and mss received with SYN.
It also does not include TCP options.
tp->pmtu_cookie is last pmtu, seen by this function.
@@ -1163,7 +1173,7 @@ u32 __tcp_select_window(struct sock *sk)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
- /* MSS for the peer's data. Previous verions used mss_clamp
+ /* MSS for the peer's data. Previous versions used mss_clamp
* here. I don't know if the value based on our guesses
* of peer's MSS is better for the performance. It's more correct
* but may be worse for the performance because of rcv_mss
@@ -1252,7 +1262,10 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m
BUG_ON(tcp_skb_pcount(skb) != 1 ||
tcp_skb_pcount(next_skb) != 1);
- /* Ok. We will be able to collapse the packet. */
+ /* changing transmit queue under us so clear hints */
+ clear_all_retrans_hints(tp);
+
+ /* Ok. We will be able to collapse the packet. */
__skb_unlink(next_skb, &sk->sk_write_queue);
memcpy(skb_put(skb, next_skb_size), next_skb->data, next_skb_size);
@@ -1322,6 +1335,8 @@ void tcp_simple_retransmit(struct sock *sk)
}
}
+ clear_all_retrans_hints(tp);
+
if (!lost)
return;
@@ -1353,7 +1368,7 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
int err;
/* Do not sent more than we queued. 1/4 is reserved for possible
- * copying overhead: frgagmentation, tunneling, mangling etc.
+ * copying overhead: fragmentation, tunneling, mangling etc.
*/
if (atomic_read(&sk->sk_wmem_alloc) >
min(sk->sk_wmem_queued + (sk->sk_wmem_queued >> 2), sk->sk_sndbuf))
@@ -1460,13 +1475,25 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
- int packet_cnt = tp->lost_out;
+ int packet_cnt;
+
+ if (tp->retransmit_skb_hint) {
+ skb = tp->retransmit_skb_hint;
+ packet_cnt = tp->retransmit_cnt_hint;
+ }else{
+ skb = sk->sk_write_queue.next;
+ packet_cnt = 0;
+ }
/* First pass: retransmit lost packets. */
- if (packet_cnt) {
- sk_stream_for_retrans_queue(skb, sk) {
+ if (tp->lost_out) {
+ sk_stream_for_retrans_queue_from(skb, sk) {
__u8 sacked = TCP_SKB_CB(skb)->sacked;
+ /* we could do better than to assign each time */
+ tp->retransmit_skb_hint = skb;
+ tp->retransmit_cnt_hint = packet_cnt;
+
/* Assume this retransmit will generate
* only one packet for congestion window
* calculation purposes. This works because
@@ -1477,10 +1504,12 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
if (tcp_packets_in_flight(tp) >= tp->snd_cwnd)
return;
- if (sacked&TCPCB_LOST) {
+ if (sacked & TCPCB_LOST) {
if (!(sacked&(TCPCB_SACKED_ACKED|TCPCB_SACKED_RETRANS))) {
- if (tcp_retransmit_skb(sk, skb))
+ if (tcp_retransmit_skb(sk, skb)) {
+ tp->retransmit_skb_hint = NULL;
return;
+ }
if (icsk->icsk_ca_state != TCP_CA_Loss)
NET_INC_STATS_BH(LINUX_MIB_TCPFASTRETRANS);
else
@@ -1493,8 +1522,8 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
TCP_RTO_MAX);
}
- packet_cnt -= tcp_skb_pcount(skb);
- if (packet_cnt <= 0)
+ packet_cnt += tcp_skb_pcount(skb);
+ if (packet_cnt >= tp->lost_out)
break;
}
}
@@ -1520,9 +1549,18 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
if (tcp_may_send_now(sk, tp))
return;
- packet_cnt = 0;
+ if (tp->forward_skb_hint) {
+ skb = tp->forward_skb_hint;
+ packet_cnt = tp->forward_cnt_hint;
+ } else{
+ skb = sk->sk_write_queue.next;
+ packet_cnt = 0;
+ }
+
+ sk_stream_for_retrans_queue_from(skb, sk) {
+ tp->forward_cnt_hint = packet_cnt;
+ tp->forward_skb_hint = skb;
- sk_stream_for_retrans_queue(skb, sk) {
/* Similar to the retransmit loop above we
* can pretend that the retransmitted SKB
* we send out here will be composed of one
@@ -1539,8 +1577,10 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
continue;
/* Ok, retransmit it. */
- if (tcp_retransmit_skb(sk, skb))
+ if (tcp_retransmit_skb(sk, skb)) {
+ tp->forward_skb_hint = NULL;
break;
+ }
if (skb == skb_peek(&sk->sk_write_queue))
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
@@ -1601,7 +1641,7 @@ void tcp_send_fin(struct sock *sk)
* was unread data in the receive queue. This behavior is recommended
* by draft-ietf-tcpimpl-prob-03.txt section 3.10. -DaveM
*/
-void tcp_send_active_reset(struct sock *sk, unsigned int __nocast priority)
+void tcp_send_active_reset(struct sock *sk, gfp_t priority)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
@@ -2050,3 +2090,4 @@ EXPORT_SYMBOL(tcp_connect);
EXPORT_SYMBOL(tcp_make_synack);
EXPORT_SYMBOL(tcp_simple_retransmit);
EXPORT_SYMBOL(tcp_sync_mss);
+EXPORT_SYMBOL(sysctl_tcp_tso_win_divisor);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 13:51:55 +0100