io_uring/net: add generic multishot retry helper

This is just moving io_recv_prep_retry() higher up so it can get used
for sends as well, and rename it to be generically useful for both
sends and receives.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/net.c

@@ -185,6 +185,17 @@ static int io_net_vec_assign(struct io_kiocb *req, struct io_async_msghdr *kmsg,
 	return 0;
 }
 
+static inline void io_mshot_prep_retry(struct io_kiocb *req,
+				       struct io_async_msghdr *kmsg)
+{
+	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
+
+	req->flags &= ~REQ_F_BL_EMPTY;
+	sr->done_io = 0;
+	sr->len = 0; /* get from the provided buffer */
+	req->buf_index = sr->buf_group;
+}
+
 #ifdef CONFIG_COMPAT
 static int io_compat_msg_copy_hdr(struct io_kiocb *req,
 				  struct io_async_msghdr *iomsg,
@@ -658,17 +669,6 @@ int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	return io_recvmsg_prep_setup(req);
 }
 
-static inline void io_recv_prep_retry(struct io_kiocb *req,
-				      struct io_async_msghdr *kmsg)
-{
-	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
-
-	req->flags &= ~REQ_F_BL_EMPTY;
-	sr->done_io = 0;
-	sr->len = 0; /* get from the provided buffer */
-	req->buf_index = sr->buf_group;
-}
-
 /*
  * Finishes io_recv and io_recvmsg.
  *
@@ -694,7 +694,7 @@ static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
 		struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
 		int mshot_retry_ret = IOU_ISSUE_SKIP_COMPLETE;
 
-		io_recv_prep_retry(req, kmsg);
+		io_mshot_prep_retry(req, kmsg);
 		/* Known not-empty or unknown state, retry */
 		if (cflags & IORING_CQE_F_SOCK_NONEMPTY || kmsg->msg.msg_inq < 0) {
 			if (sr->nr_multishot_loops++ < MULTISHOT_MAX_RETRY)