netdev - [PATCH net 4/4] net: also flag accepted sockets supporting msghdr originated zerocopy

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Message-Id: <d8869997f50c23e8446b4c35e3800ebe4bc8e92f.1666825799.git.asml.silence@gmail.com>
Date:   Thu, 27 Oct 2022 00:25:59 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S . Miller" <davem@...emloft.net>, io-uring@...r.kernel.org,
        John Fastabend <john.fastabend@...il.com>,
        asml.silence@...il.com, Stefan Metzmacher <metze@...ba.org>
Subject: [PATCH net 4/4] net: also flag accepted sockets supporting msghdr originated zerocopy

From: Stefan Metzmacher <metze@...ba.org>

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@...r.kernel.org> # 6.0
CC: Pavel Begunkov <asml.silence@...il.com>
Cc: Jakub Kicinski <kuba@...nel.org>
CC: Jens Axboe <axboe@...nel.dk>
Link: https://lore.kernel.org/io-uring/20221024141503.22b4e251@kernel.org/T/#m38aa19b0b825758fb97860a38ad13122051f9dda
Signed-off-by: Stefan Metzmacher <metze@...ba.org>
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 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