From: Stefan Metzmacher <metze@xxxxxxxxx>
Without this only the client initiated tcp sockets have SOCK_SUPPORT_ZC.
The listening socket on the server also has it, but the accepted
connections didn't, which meant IORING_OP_SEND[MSG]_ZC will always
fails with -EOPNOTSUPP.
Fixes: e993ffe3da4b ("net: flag sockets supporting msghdr originated zerocopy")
Cc: <stable@xxxxxxxxxxxxxxx> # 6.0
CC: Pavel Begunkov <asml.silence@xxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
CC: Jens Axboe <axboe@xxxxxxxxx>
Link: https://lore.kernel.org/io-uring/20221024141503.22b4e251@xxxxxxxxxx/T/#m38aa19b0b825758fb97860a38ad13122051f9dda
Signed-off-by: Stefan Metzmacher <metze@xxxxxxxxx>
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
net/ipv4/af_inet.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 3dd02396517d..4728087c42a5 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -754,6 +754,8 @@ int inet_accept(struct socket *sock, struct socket *newsock, int flags,
(TCPF_ESTABLISHED | TCPF_SYN_RECV |
TCPF_CLOSE_WAIT | TCPF_CLOSE)));
+ if (test_bit(SOCK_SUPPORT_ZC, &sock->flags))
+ set_bit(SOCK_SUPPORT_ZC, &newsock->flags);
sock_graft(sk2, newsock);
newsock->state = SS_CONNECTED;
--
2.38.0
