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authorJens Axboe <axboe@kernel.dk>2023-05-17 12:23:41 -0600
committerJens Axboe <axboe@kernel.dk>2023-05-17 13:14:11 -0600
commita2741c58ac677e5de35bba7dec6376579dd513cd (patch)
tree99316f456b6a8b9300ecaaf7d0091c104e0683ab /io_uring/net.c
parent7d41bcb7f32fbeac05d6fab553821a228af18bee (diff)
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>
Diffstat (limited to 'io_uring/net.c')
-rw-r--r--io_uring/net.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/io_uring/net.c b/io_uring/net.c
index 9e0034771dbb..0795f3783013 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -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. */
}