io_uring: ignore POLLIN for recvmsg on MSG_ERRQUEUE

Currently, io_uring's recvmsg subscribes to both POLLERR and POLLIN. In
the context of TCP tx zero-copy, this is inefficient since we are only
reading the error queue and not using recvmsg to read POLLIN responses.

This patch was tested by using a simple sending program to call recvmsg
using io_uring with MSG_ERRQUEUE set and verifying with printks that the
POLLIN is correctly unset when the msg flags are MSG_ERRQUEUE.

Signed-off-by: Arjun Roy <[email protected]>
Signed-off-by: Soheil Hassas Yeganeh <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Signed-off-by: Luke Hsiao <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

0 files changed, 0 insertions, 0 deletions