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io_uring/net: don't retry recvmsg() unnecessarily 

If we're doing multishot receives, then we always end up doing two trips
through sock_recvmsg(). For protocols that sanely set msghdr->msg_inq,
then we don't need to waste time picking a new buffer and attempting a
new receive if there's nothing there.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-05-17 12:23:41 -06:00
parent 7d41bcb7f3
commit a2741c58ac
1 changed files with 9 additions and 1 deletions
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io_uring/net.c
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@ -635,7 +635,15 @@ static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
if (io_aux_cqe(req->ctx, issue_flags & IO_URING_F_COMPLETE_DEFER,
req->cqe.user_data, *ret, cflags | IORING_CQE_F_MORE, true)) {
io_recv_prep_retry(req);
return false;
/* Known not-empty or unknown state, retry */
if (cflags & IORING_CQE_F_SOCK_NONEMPTY ||
msg->msg_inq == -1U)
return false;
if (issue_flags & IO_URING_F_MULTISHOT)
*ret = IOU_ISSUE_SKIP_COMPLETE;
else
*ret = -EAGAIN;
return true;
}
/* Otherwise stop multishot but use the current result. */
}