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tcp: set recv_skip_hint when tcp_inq is less than PAGE_SIZE 

When we have less than PAGE_SIZE of data on receive queue,
we set recv_skip_hint to 0. Instead, set it to the actual
number of bytes available.

Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Soheil Hassas Yeganeh 2018-09-26 16:57:03 -04:00 committed by David S. Miller
parent 2240c12d7d
commit 8f2b029311
1 changed files with 9 additions and 5 deletions
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14
net/ipv4/tcp.c
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@ -1753,6 +1753,7 @@ static int tcp_zerocopy_receive(struct sock *sk,
struct vm_area_struct *vma;
struct sk_buff *skb = NULL;
struct tcp_sock *tp;
int inq;
int ret;
if (address & (PAGE_SIZE - 1) || address != zc->address)
@ -1773,12 +1774,15 @@ static int tcp_zerocopy_receive(struct sock *sk,
tp = tcp_sk(sk);
seq = tp->copied_seq;
zc->length = min_t(u32, zc->length, tcp_inq(sk));
inq = tcp_inq(sk);
zc->length = min_t(u32, zc->length, inq);
zc->length &= ~(PAGE_SIZE - 1);
zap_page_range(vma, address, zc->length);
zc->recv_skip_hint = 0;
if (zc->length) {
zap_page_range(vma, address, zc->length);
zc->recv_skip_hint = 0;
} else {
zc->recv_skip_hint = inq;
}
ret = 0;
while (length + PAGE_SIZE <= zc->length) {
if (zc->recv_skip_hint < PAGE_SIZE) {