io_uring/net: merge ubuf sendzc callbacks

Splitting io_tx_ubuf_callback_ext from io_tx_ubuf_callback is a pre
mature optimisation that doesn't give us much. Merge the functions into
one and reclaim some simplicity back.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d44d68f6f7add33a0dcf0b7fd7b73c2dc543604f.1712534031.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/notif.c

@@ -30,36 +30,24 @@ static void io_tx_ubuf_callback(struct sk_buff *skb, struct ubuf_info *uarg,
 	struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
 	struct io_kiocb *notif = cmd_to_io_kiocb(nd);
 
-	if (refcount_dec_and_test(&uarg->refcnt))
-		__io_req_task_work_add(notif, IOU_F_TWQ_LAZY_WAKE);
-}
-
-static void io_tx_ubuf_callback_ext(struct sk_buff *skb, struct ubuf_info *uarg,
-			     bool success)
-{
-	struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
-
 	if (nd->zc_report) {
 		if (success && !nd->zc_used && skb)
 			WRITE_ONCE(nd->zc_used, true);
 		else if (!success && !nd->zc_copied)
 			WRITE_ONCE(nd->zc_copied, true);
 	}
-	io_tx_ubuf_callback(skb, uarg, success);
+
+	if (refcount_dec_and_test(&uarg->refcnt))
+		__io_req_task_work_add(notif, IOU_F_TWQ_LAZY_WAKE);
 }
 
 void io_notif_set_extended(struct io_kiocb *notif)
 {
 	struct io_notif_data *nd = io_notif_to_data(notif);
 
-	if (nd->uarg.callback != io_tx_ubuf_callback_ext) {
-		nd->account_pages = 0;
-		nd->zc_report = false;
-		nd->zc_used = false;
-		nd->zc_copied = false;
-		nd->uarg.callback = io_tx_ubuf_callback_ext;
-		notif->io_task_work.func = io_notif_complete_tw_ext;
-	}
+	nd->zc_used = false;
+	nd->zc_copied = false;
+	notif->io_task_work.func = io_notif_complete_tw_ext;
 }
 
 struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx)
@@ -79,6 +67,8 @@ struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx)
 	notif->io_task_work.func = io_req_task_complete;
 
 	nd = io_notif_to_data(notif);
+	nd->zc_report = false;
+	nd->account_pages = 0;
 	nd->uarg.flags = IO_NOTIF_UBUF_FLAGS;
 	nd->uarg.callback = io_tx_ubuf_callback;
 	refcount_set(&nd->uarg.refcnt, 1);