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Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Arseny Krasnov , Colin Ian King , Norbert Slusarek , Andra Paraschiv CC: , , , , Subject: [RFC PATCH v2 1/6] af_vsock/virtio/vsock: change seqpacket receive logic Date: Sun, 4 Jul 2021 11:09:39 +0300 Message-ID: <20210704080942.89177-1-arseny.krasnov@kaspersky.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210704080820.88746-1-arseny.krasnov@kaspersky.com> References: <20210704080820.88746-1-arseny.krasnov@kaspersky.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.64.68.129] X-ClientProxiedBy: hqmailmbx2.avp.ru (10.64.67.242) To hqmailmbx3.avp.ru (10.64.67.243) X-KSE-ServerInfo: hqmailmbx3.avp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 5.9.20, Database issued on: 07/04/2021 07:43:44 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 0 X-KSE-AntiSpam-Info: Lua profiles 164820 [Jul 03 2021] X-KSE-AntiSpam-Info: Version: 5.9.20.0 X-KSE-AntiSpam-Info: Envelope from: arseny.krasnov@kaspersky.com X-KSE-AntiSpam-Info: LuaCore: 448 448 71fb1b37213ce9a885768d4012c46ac449c77b17 X-KSE-AntiSpam-Info: {Tracking_from_exist} X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: kaspersky.com:7.1.1;127.0.0.199:7.1.2;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;arseniy-pc.avp.ru:7.1.1 X-KSE-AntiSpam-Info: Rate: 0 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 07/04/2021 07:45:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 04.07.2021 5:50:00 X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit X-KLMS-Rule-ID: 52 X-KLMS-Message-Action: clean X-KLMS-AntiSpam-Status: not scanned, disabled by settings X-KLMS-AntiSpam-Interceptor-Info: not scanned X-KLMS-AntiPhishing: Clean, bases: 2021/07/04 06:12:00 X-KLMS-AntiVirus: Kaspersky Security for Linux Mail Server, version 8.0.3.30, bases: 2021/07/04 01:03:00 #16855183 X-KLMS-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 1) In af_vsock "loop" now is really loop: it receives message fragments one by one, until 'msg_ready' value is returned by transport. 2) In virtio transport, dequeue callback is called everytime when at least one fragment of message is received. Signed-off-by: Arseny Krasnov --- include/linux/virtio_vsock.h | 3 +- include/net/af_vsock.h | 2 +- net/vmw_vsock/af_vsock.c | 33 +++++++++---- net/vmw_vsock/virtio_transport_common.c | 62 +++++++++++-------------- 4 files changed, 52 insertions(+), 48 deletions(-) diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h index 35d7eedb5e8e..e68b4029f038 100644 --- a/include/linux/virtio_vsock.h +++ b/include/linux/virtio_vsock.h @@ -88,7 +88,8 @@ virtio_transport_seqpacket_enqueue(struct vsock_sock *vsk, ssize_t virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk, struct msghdr *msg, - int flags); + int flags, + bool *msg_ready); s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); u32 virtio_transport_seqpacket_has_data(struct vsock_sock *vsk); diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index ab207677e0a8..c40d341611b0 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -137,7 +137,7 @@ struct vsock_transport { /* SEQ_PACKET. */ ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg, - int flags); + int flags, bool *msg_ready); int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg, size_t len); bool (*seqpacket_allow)(u32 remote_cid); diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 3e02cc3b24f8..b66884def8e8 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1881,7 +1881,7 @@ static int vsock_connectible_wait_data(struct sock *sk, err = 0; transport = vsk->transport; - while ((data = vsock_connectible_has_data(vsk)) == 0) { + while ((data = vsock_stream_has_data(vsk)) == 0) { prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE); if (sk->sk_err != 0 || @@ -2013,6 +2013,7 @@ static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags) { const struct vsock_transport *transport; + bool msg_ready; struct vsock_sock *vsk; ssize_t record_len; long timeout; @@ -2023,23 +2024,36 @@ static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg, transport = vsk->transport; timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); + msg_ready = false; + record_len = 0; - err = vsock_connectible_wait_data(sk, &wait, timeout, NULL, 0); - if (err <= 0) - goto out; + while (!msg_ready) { + ssize_t fragment_len; + int intr_err; - record_len = transport->seqpacket_dequeue(vsk, msg, flags); + intr_err = vsock_connectible_wait_data(sk, &wait, timeout, NULL, 0); + if (intr_err <= 0) { + err = intr_err; + break; + } - if (record_len < 0) { - err = -ENOMEM; - goto out; + fragment_len = transport->seqpacket_dequeue(vsk, msg, flags, &msg_ready); + + if (fragment_len < 0) { + err = -ENOMEM; + break; + } + + record_len += fragment_len; } if (sk->sk_err) { err = -sk->sk_err; } else if (sk->sk_shutdown & RCV_SHUTDOWN) { err = 0; - } else { + } + + if (msg_ready && !err) { /* User sets MSG_TRUNC, so return real length of * packet. */ @@ -2055,7 +2069,6 @@ static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg, msg->msg_flags |= MSG_TRUNC; } -out: return err; } diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index 169ba8b72a63..053bcea1a03f 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -407,58 +407,48 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk, struct msghdr *msg, - int flags) + int flags, + bool *msg_ready) { struct virtio_vsock_sock *vvs = vsk->trans; struct virtio_vsock_pkt *pkt; int dequeued_len = 0; size_t user_buf_len = msg_data_left(msg); - bool msg_ready = false; + *msg_ready = false; spin_lock_bh(&vvs->rx_lock); - if (vvs->msg_count == 0) { - spin_unlock_bh(&vvs->rx_lock); - return 0; - } + while (!*msg_ready && !list_empty(&vvs->rx_queue) && dequeued_len >= 0) { + size_t pkt_len; + size_t bytes_to_copy; - while (!msg_ready) { pkt = list_first_entry(&vvs->rx_queue, struct virtio_vsock_pkt, list); + pkt_len = (size_t)le32_to_cpu(pkt->hdr.len); - if (dequeued_len >= 0) { - size_t pkt_len; - size_t bytes_to_copy; + bytes_to_copy = min(user_buf_len, pkt_len); - pkt_len = (size_t)le32_to_cpu(pkt->hdr.len); - bytes_to_copy = min(user_buf_len, pkt_len); - - if (bytes_to_copy) { - int err; - - /* sk_lock is held by caller so no one else can dequeue. - * Unlock rx_lock since memcpy_to_msg() may sleep. - */ - spin_unlock_bh(&vvs->rx_lock); + if (bytes_to_copy) { + int err; + /* sk_lock is held by caller so no one else can dequeue. + * Unlock rx_lock since memcpy_to_msg() may sleep. + */ + spin_unlock_bh(&vvs->rx_lock); - err = memcpy_to_msg(msg, pkt->buf, bytes_to_copy); - if (err) { - /* Copy of message failed. Rest of - * fragments will be freed without copy. - */ - dequeued_len = err; - } else { - user_buf_len -= bytes_to_copy; - } + err = memcpy_to_msg(msg, pkt->buf, bytes_to_copy); - spin_lock_bh(&vvs->rx_lock); - } + spin_lock_bh(&vvs->rx_lock); - if (dequeued_len >= 0) - dequeued_len += pkt_len; + if (err) + dequeued_len = err; + else + user_buf_len -= bytes_to_copy; } + if (dequeued_len >= 0) + dequeued_len += pkt_len; + if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR) { - msg_ready = true; + *msg_ready = true; vvs->msg_count--; } @@ -489,12 +479,12 @@ EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue); ssize_t virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk, struct msghdr *msg, - int flags) + int flags, bool *msg_ready) { if (flags & MSG_PEEK) return -EOPNOTSUPP; - return virtio_transport_seqpacket_do_dequeue(vsk, msg, flags); + return virtio_transport_seqpacket_do_dequeue(vsk, msg, flags, msg_ready); } EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_dequeue); -- 2.25.1