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net-timestamp: fix missing ACK timestamp 

ACK timestamps are generated in tcp_clean_rtx_queue. The TSO datapath
can break out early, causing the timestamp code to be skipped. Move
the code up before the break.

Reported-by: David S. Miller <davem@davemloft.net>

Also fix a boundary condition: tp->snd_una is the next unacknowledged
byte and between tests inclusive (a <= b <= c), so generate a an ACK
timestamp if (prior_snd_una <= tskey <= tp->snd_una - 1).

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Willem de Bruijn 2014-08-12 14:53:16 -04:00 committed by David S. Miller
parent cd094927c6
commit 712a72213f
1 changed files with 5 additions and 5 deletions
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10
net/ipv4/tcp_input.c
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@ -3050,10 +3050,15 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
first_ackt.v64 = 0;
while ((skb = tcp_write_queue_head(sk)) && skb != tcp_send_head(sk)) {
struct skb_shared_info *shinfo = skb_shinfo(skb);
struct tcp_skb_cb *scb = TCP_SKB_CB(skb);
u8 sacked = scb->sacked;
u32 acked_pcount;
if (unlikely(shinfo->tx_flags & SKBTX_ACK_TSTAMP) &&
between(shinfo->tskey, prior_snd_una, tp->snd_una - 1))
__skb_tstamp_tx(skb, NULL, sk, SCM_TSTAMP_ACK);
/* Determine how many packets and what bytes were acked, tso and else */
if (after(scb->end_seq, tp->snd_una)) {
if (tcp_skb_pcount(skb) == 1 ||
@ -3107,11 +3112,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
tp->retrans_stamp = 0;
}
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_ACK_TSTAMP) &&
between(skb_shinfo(skb)->tskey, prior_snd_una,
tp->snd_una + 1))
__skb_tstamp_tx(skb, NULL, sk, SCM_TSTAMP_ACK);
if (!fully_acked)
break;