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tcp: make mtu probe failure to not break gso'ed skbs unnecessarily 

I noticed that since skb->len has nothing to do with actual segment
length with gso, we need to figure it out separately, reuse
a function from the recent shifting stuff (generalize it).

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2008-12-05 22:41:26 -08:00 committed by David S. Miller
parent 9969ca5f20
commit 775ffabf77
1 changed files with 7 additions and 12 deletions
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19
net/ipv4/tcp_input.c
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@ -1445,14 +1445,9 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *prev,
/* I wish gso_size would have a bit more sane initialization than /* I wish gso_size would have a bit more sane initialization than
* something-or-zero which complicates things * something-or-zero which complicates things
*/ */
static int tcp_shift_mss(struct sk_buff *skb) static int tcp_skb_seglen(struct sk_buff *skb)
{ {
int mss = tcp_skb_mss(skb); return tcp_skb_pcount(skb) == 1 ? skb->len : tcp_skb_mss(skb);
if (!mss)
mss = skb->len;
return mss;
} }
/* Shifting pages past head area doesn't work */ /* Shifting pages past head area doesn't work */
@ -1503,12 +1498,12 @@ static struct sk_buff *tcp_shift_skb_data(struct sock *sk, struct sk_buff *skb,
if (in_sack) { if (in_sack) {
len = skb->len; len = skb->len;
pcount = tcp_skb_pcount(skb); pcount = tcp_skb_pcount(skb);
mss = tcp_shift_mss(skb); mss = tcp_skb_seglen(skb);
/* TODO: Fix DSACKs to not fragment already SACKed and we can /* TODO: Fix DSACKs to not fragment already SACKed and we can
* drop this restriction as unnecessary * drop this restriction as unnecessary
*/ */
if (mss != tcp_shift_mss(prev)) if (mss != tcp_skb_seglen(prev))
goto fallback; goto fallback;
} else { } else {
if (!after(TCP_SKB_CB(skb)->end_seq, start_seq)) if (!after(TCP_SKB_CB(skb)->end_seq, start_seq))
@ -1549,7 +1544,7 @@ static struct sk_buff *tcp_shift_skb_data(struct sock *sk, struct sk_buff *skb,
/* TODO: Fix DSACKs to not fragment already SACKed and we can /* TODO: Fix DSACKs to not fragment already SACKed and we can
* drop this restriction as unnecessary * drop this restriction as unnecessary
*/ */
if (mss != tcp_shift_mss(prev)) if (mss != tcp_skb_seglen(prev))
goto fallback; goto fallback;
if (len == mss) { if (len == mss) {
@ -1578,7 +1573,7 @@ static struct sk_buff *tcp_shift_skb_data(struct sock *sk, struct sk_buff *skb,
if (!skb_can_shift(skb) || if (!skb_can_shift(skb) ||
(skb == tcp_send_head(sk)) || (skb == tcp_send_head(sk)) ||
((TCP_SKB_CB(skb)->sacked & TCPCB_TAGBITS) != TCPCB_SACKED_ACKED) || ((TCP_SKB_CB(skb)->sacked & TCPCB_TAGBITS) != TCPCB_SACKED_ACKED) ||
(mss != tcp_shift_mss(skb))) (mss != tcp_skb_seglen(skb)))
goto out; goto out;
len = skb->len; len = skb->len;
@ -2853,7 +2848,7 @@ void tcp_simple_retransmit(struct sock *sk)
tcp_for_write_queue(skb, sk) { tcp_for_write_queue(skb, sk) {
if (skb == tcp_send_head(sk)) if (skb == tcp_send_head(sk))
break; break;
if (skb->len > mss && if (tcp_skb_seglen(skb) > mss &&
!(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) { !(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) {
if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) { if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) {
TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS; TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;