diff options
| author | Magnus Karlsson <magnus.karlsson@intel.com> | 2021-12-17 15:56:46 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-22 09:29:40 +0100 |
| commit | 192fe5739571ec5c1b4928d5230b4d49172bc669 (patch) | |
| tree | 98a8ed35f568a36b1bf20c01ba80c30a35ce1427 | |
| parent | e281b71992368a3b13206c962793e66c43e51efb (diff) | |
Revert "xsk: Do not sleep in poll() when need_wakeup set"
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 <magnus.karlsson@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211217145646.26449-1-magnus.karlsson@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/xdp/xsk.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 4ec5f4463a71..2bc0d6e3e124 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -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)) |