[PATCH v2] io_uring/zcrx: return early from io_zcrx_recv_skb if readlen is 0

[David Wei <dw@davidwei.uk>]

When readlen is set for a recvzc request, tcp_read_sock() will call
io_zcrx_recv_skb() one final time with len == desc->count == 0. This is
caused by the !desc->count check happening too late. The offset + 1 !=
skb->len happens earlier and causes the while loop to continue.

Fix this in io_zcrx_recv_skb() instead of tcp_read_sock(). Return early
if len is 0 i.e. the read is done.

Changes in v2:
--------------
* Add Fixes tag
* Return 0 directly
* Add comment explaining why the !len check is needed

Fixes: 6699ec9a23f8 ("io_uring/zcrx: add a read limit to recvzc requests")
Signed-off-by: David Wei <dw@davidwei.uk>
---
 io_uring/zcrx.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 9c95b5b6ec4e..2c8b29c745c5 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -818,6 +818,13 @@ io_zcrx_recv_skb(read_descriptor_t *desc, struct sk_buff *skb,
 	int ret = 0;
 
 	len = min_t(size_t, len, desc->count);
+	/* __tcp_read_sock() always calls io_zcrx_recv_skb one last time, even
+	 * if desc->count is already 0. This is caused by the if (offset + 1 !=
+	 * skb->len) check. Return early in this case to break out of
+	 * __tcp_read_sock().
+	 */
+	if (!len)
+		return 0;
 	if (unlikely(args->nr_skbs++ > IO_SKBS_PER_CALL_LIMIT))
 		return -EAGAIN;
 
-- 
2.47.1