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net-zerocopy: Fast return if inq < PAGE_SIZE

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Sometimes, we may call tcp receive zerocopy when inq is 0,
or inq < PAGE_SIZE, in which case we cannot remap pages. In this case,
simply return the appropriate hint for regular copying without taking
mmap_sem.

Signed-off-by: Arjun Roy <arjunroy@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Arjun Roy 2020-12-02 14:53:46 -08:00 committed by Jakub Kicinski
parent 98917cf0d6
commit 936ced4157
1 changed files with 8 additions and 0 deletions
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8
net/ipv4/tcp.c
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@ -1904,6 +1904,14 @@ static int tcp_zerocopy_receive(struct sock *sk,
sock_rps_record_flow(sk);
if (inq < PAGE_SIZE) {
zc->length = 0;
zc->recv_skip_hint = inq;
if (!inq && sock_flag(sk, SOCK_DONE))
return -EIO;
return 0;
}
mmap_read_lock(current->mm);
vma = find_vma(current->mm, address);