linux-kernel - [RFC PATCH v4 13/17] net/sock: enable setting SO_ZEROCOPY for PF

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Message-ID: <20230603204939.1598818-14-AVKrasnov@sberdevices.ru>
Date:   Sat, 3 Jun 2023 23:49:35 +0300
From:   Arseniy Krasnov <AVKrasnov@...rdevices.ru>
To:     Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>
CC:     <kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...rdevices.ru>, <oxffffaa@...il.com>,
        <avkrasnov@...rdevices.ru>,
        Arseniy Krasnov <AVKrasnov@...rdevices.ru>
Subject: [RFC PATCH v4 13/17] net/sock: enable setting SO_ZEROCOPY for PF_VSOCK

PF_VSOCK supports MSG_ZEROCOPY transmission, so SO_ZEROCOPY could
be enabled. PF_VSOCK implementation is a little bit special comparing to
PF_INET - MSG_ZEROCOPY support depends on transport layer of PF_VSOCK,
but here we can't "ask" its transport, so setting of this option is
always allowed, but if some transport doesn't support zerocopy tx, send
callback of PF_VSOCK will return -EOPNOTSUPP.

Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
---
 net/core/sock.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index 5440e67bcfe3..d558e541e6d7 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1452,9 +1452,11 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
 			      (sk->sk_type == SOCK_DGRAM &&
 			       sk->sk_protocol == IPPROTO_UDP)))
 				ret = -EOPNOTSUPP;
-		} else if (sk->sk_family != PF_RDS) {
+		} else if (sk->sk_family != PF_RDS &&
+			   sk->sk_family != PF_VSOCK) {
 			ret = -EOPNOTSUPP;
 		}
+
 		if (!ret) {
 			if (val < 0 || val > 1)
 				ret = -EINVAL;
-- 
2.25.1