lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[TCP]: Keep TSO enabled even during loss events.

Browse Source 
All we need to do is resegment the queue so that
we record SACK information accurately.  The edges
of the SACK blocks guide our resegmenting decisions.

With help from Herbert Xu.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2005-09-01 22:47:01 -07:00
parent ef01578615
commit 6475be16fd
3 changed files with 45 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
net/ipv4/tcp_input.c
View File

@@ -923,14 +923,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
int flag = 0;
int i;
/* So, SACKs for already sent large segments will be lost.
* Not good, but alternative is to resegment the queue. */
if (sk->sk_route_caps & NETIF_F_TSO) {
sk->sk_route_caps &= ~NETIF_F_TSO;
sock_set_flag(sk, SOCK_NO_LARGESEND);
tp->mss_cache = tp->mss_cache;
}
if (!tp->sacked_out)
tp->fackets_out = 0;
prior_fackets = tp->fackets_out;
@@ -978,20 +970,40 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
flag |= FLAG_DATA_LOST;
sk_stream_for_retrans_queue(skb, sk) {
u8 sacked = TCP_SKB_CB(skb)->sacked;
int in_sack;
int in_sack, pcount;
u8 sacked;
/* The retransmission queue is always in order, so
* we can short-circuit the walk early.
*/
if(!before(TCP_SKB_CB(skb)->seq, end_seq))
if (!before(TCP_SKB_CB(skb)->seq, end_seq))
break;
fack_count += tcp_skb_pcount(skb);
pcount = tcp_skb_pcount(skb);
if (pcount > 1 &&
(after(start_seq, TCP_SKB_CB(skb)->seq) ||
before(end_seq, TCP_SKB_CB(skb)->end_seq))) {
unsigned int pkt_len;
if (after(start_seq, TCP_SKB_CB(skb)->seq))
pkt_len = (start_seq -
TCP_SKB_CB(skb)->seq);
else
pkt_len = (end_seq -
TCP_SKB_CB(skb)->seq);
if (tcp_fragment(sk, skb, pkt_len, skb_shinfo(skb)->tso_size))
break;
pcount = tcp_skb_pcount(skb);
}
fack_count += pcount;
in_sack = !after(start_seq, TCP_SKB_CB(skb)->seq) &&
!before(end_seq, TCP_SKB_CB(skb)->end_seq);
sacked = TCP_SKB_CB(skb)->sacked;
/* Account D-SACK for retransmitted packet. */
if ((dup_sack && in_sack) &&
(sacked & TCPCB_RETRANS) &&