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Revert "xsk: Do not sleep in poll() when need_wakeup set"

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commit 0706a78f31c4217ca144f630063ec9561a21548d upstream.

This reverts commit bd0687c18e635b63233dc87f38058cd728802ab4.

This patch causes a Tx only workload to go to sleep even when it does
not have to, leading to misserable performance in skb mode. It fixed
one rare problem but created a much worse one, so this need to be
reverted while I try to craft a proper solution to the original
problem.

Fixes: bd0687c18e63 ("xsk: Do not sleep in poll() when need_wakeup set")
Signed-off-by: Magnus Karlsson <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Magnus Karlsson 2021-12-17 15:56:46 +01:00 • committed by Greg Kroah-Hartman
commit 192fe57395
1 changed files with 2 additions and 2 deletions
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4
net/xdp/xsk.c
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@ -434,6 +434,8 @@ static __poll_t xsk_poll(struct file *file, struct socket *sock,
struct xdp_sock *xs = xdp_sk(sk);
struct xdp_umem *umem;
sock_poll_wait(file, sock, wait);
if (unlikely(!xsk_is_bound(xs)))
return mask;
@ -445,8 +447,6 @@ static __poll_t xsk_poll(struct file *file, struct socket *sock,
else
/* Poll needs to drive Tx also in copy mode */
__xsk_sendmsg(sk);
} else {
sock_poll_wait(file, sock, wait);
}
if (xs->rx && !xskq_empty_desc(xs->rx))