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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Michael S. Tsirkin" , Jason Wang , Bobby Eshleman CC: , , , , , , , Arseniy Krasnov Subject: [RFC PATCH v2 08/15] vsock: check for MSG_ZEROCOPY support Date: Sun, 23 Apr 2023 22:26:36 +0300 Message-ID: <20230423192643.1537470-9-AVKrasnov@sberdevices.ru> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20230423192643.1537470-1-AVKrasnov@sberdevices.ru> References: <20230423192643.1537470-1-AVKrasnov@sberdevices.ru> MIME-Version: 1.0 X-Originating-IP: [172.16.1.6] X-ClientProxiedBy: S-MS-EXCH01.sberdevices.ru (172.16.1.4) To S-MS-EXCH01.sberdevices.ru (172.16.1.4) X-KSMG-Rule-ID: 4 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Status: not scanned, disabled by settings X-KSMG-AntiSpam-Interceptor-Info: not scanned X-KSMG-AntiPhishing: not scanned, disabled by settings X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2023/04/23 16:01:00 #21150277 X-KSMG-AntiVirus-Status: Clean, skipped X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1763997065422879119?= X-GMAIL-MSGID: =?utf-8?q?1763997065422879119?= This feature totally depends on transport, so if transport doesn't support it, return error. Signed-off-by: Arseniy Krasnov --- include/net/af_vsock.h | 3 +++ net/vmw_vsock/af_vsock.c | 7 +++++++ 2 files changed, 10 insertions(+) diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index 0e7504a42925..270ca54cfab8 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -177,6 +177,9 @@ struct vsock_transport { /* Read a single skb */ int (*read_skb)(struct vsock_sock *, skb_read_actor_t); + + /* Zero-copy. */ + bool (*msgzerocopy_allow)(void); }; /**** CORE ****/ diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index c50d2632a75f..eac8c1affd6a 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1824,6 +1824,13 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, goto out; } + if (msg->msg_flags & MSG_ZEROCOPY && + (!transport->msgzerocopy_allow || + !transport->msgzerocopy_allow())) { + err = -EOPNOTSUPP; + goto out; + } + /* Wait for room in the produce queue to enqueue our user's data. */ timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);