diff options
| author |   Arjun Roy <arjunroy@google.com> | 2019-12-15 11:54:51 -0800 |
|---|---|---|
| committer |   Jakub Kicinski <jakub.kicinski@netronome.com> | 2019-12-15 12:13:41 -0800 |
| commit | 0e627190563e8be6fc9c2cc2a8a3c14bd961754c (patch) | |
| tree | ee22c5074bfc6d19b54d7202ec336f8521e2d4bd /net | |
| parent | net/smc: shorten lgr_cnt initialization (diff) | |
| download | linux-dev-0e627190563e8be6fc9c2cc2a8a3c14bd961754c.tar.xz linux-dev-0e627190563e8be6fc9c2cc2a8a3c14bd961754c.zip | |
tcp: Set rcv zerocopy hint correctly if skb last frag is < PAGE_SIZE
At present, if the last frag of paged data in a skb has < PAGE_SIZE
data, we compute the recv_skip_hint as being equal to the size of that
frag and the entire next skb.
Instead, just return the runt frag size as the hint.
recv_skip_hint is used by the application to skip over
bytes that can not be mmaped, so returning a too big
chunk is pessimistic and forces more bytes to be copied.
Signed-off-by: Arjun Roy <arjunroy@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 09e2cae92956..93fe77c5b02d 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1778,6 +1778,8 @@ static int tcp_zerocopy_receive(struct sock *sk, while (length + PAGE_SIZE <= zc->length) { if (zc->recv_skip_hint < PAGE_SIZE) { if (skb) { + if (zc->recv_skip_hint > 0) + break; skb = skb->next; offset = seq - TCP_SKB_CB(skb)->seq; } else { |