From patchwork Wed Nov 22 18:05:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13465321 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=salutedevices.com header.i=@salutedevices.com header.b="JQ8JXRmA" Received: from mx1.sberdevices.ru (mx1.sberdevices.ru [37.18.73.165]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6ACBDB2; Wed, 22 Nov 2023 10:13:10 -0800 (PST) Received: from p-infra-ksmg-sc-msk01 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id 5F426100068; Wed, 22 Nov 2023 21:13:06 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru 5F426100068 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=salutedevices.com; s=mail; t=1700676786; bh=f3XkhHvZLw/2CD7IbNgZejqY3mMFhJAM3QeRUGk4nxs=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=JQ8JXRmAX4D46TigD/mxC5oqm14QDseNAFSb2xyPM/bus60991vjju8BU+9rQ8tKI 9S6x/j0UET1EFpfsq31A6RXA5tY0MNPD9LbbcB8/ZGO3EUOqI4pJJPvawpQhkWLHyp ToBHt76ejglY8ZvVGfthX+swdxndLbD72nHhTXqba85sZxQH7NUWnJUZvWCC8RaOgQ H63n+NPw1og26JdjCos5iy+3ZoXLUxIAZZPopyh3/qNyG6+gQ8XuaKD2Q6RncyaCBr 3pm8xWspk+3AIh2ErZ+bhZjUVbKV9sRHXJjSdpLfo7bdFrP/S2RuBJ/57HD++ar06v kv4Qt/wZFFU4g== Received: from p-i-exch-sc-m01.sberdevices.ru (p-i-exch-sc-m01.sberdevices.ru [172.16.192.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.sberdevices.ru (Postfix) with ESMTPS; Wed, 22 Nov 2023 21:13:06 +0300 (MSK) Received: from localhost.localdomain (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Wed, 22 Nov 2023 21:13:05 +0300 From: Arseniy Krasnov To: Stefan Hajnoczi , Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Michael S. Tsirkin" , Jason Wang , Bobby Eshleman CC: , , , , , , Subject: [RFC PATCH v3 2/3] virtio/vsock: send credit update during setting SO_RCVLOWAT Date: Wed, 22 Nov 2023 21:05:09 +0300 Message-ID: <20231122180510.2297075-3-avkrasnov@salutedevices.com> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20231122180510.2297075-1-avkrasnov@salutedevices.com> References: <20231122180510.2297075-1-avkrasnov@salutedevices.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 181545 [Nov 22 2023] X-KSMG-AntiSpam-Version: 6.0.0.2 X-KSMG-AntiSpam-Envelope-From: avkrasnov@salutedevices.com X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 3 0.3.3 e5c6a18a9a9bff0226d530c5b790210c0bd117c8, {Tracking_from_domain_doesnt_match_to}, p-i-exch-sc-m01.sberdevices.ru:7.1.1,5.0.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;127.0.0.199:7.1.2;100.64.160.123:7.1.2;salutedevices.com:7.1.1, FromAlignment: s, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/11/22 11:24:00 #22501433 X-KSMG-AntiVirus-Status: Clean, skipped Send credit update message when SO_RCVLOWAT is updated and it is bigger than number of bytes in rx queue. It is needed, because 'poll()' will wait until number of bytes in rx queue will be not smaller than SO_RCVLOWAT, so kick sender to send more data. Otherwise mutual hungup for tx/rx is possible: sender waits for free space and receiver is waiting data in 'poll()'. Signed-off-by: Arseniy Krasnov --- Changelog: v1 -> v2: * Update commit message by removing 'This patch adds XXX' manner. * Do not initialize 'send_update' variable - set it directly during first usage. drivers/vhost/vsock.c | 2 ++ include/linux/virtio_vsock.h | 1 + net/vmw_vsock/virtio_transport.c | 2 ++ net/vmw_vsock/virtio_transport_common.c | 28 +++++++++++++++++++++++++ net/vmw_vsock/vsock_loopback.c | 2 ++ 5 files changed, 35 insertions(+) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index f75731396b7e..ecfa5c11f5ee 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -451,6 +451,8 @@ static struct virtio_transport vhost_transport = { .notify_buffer_size = virtio_transport_notify_buffer_size, .read_skb = virtio_transport_read_skb, + + .set_rcvlowat = virtio_transport_set_rcvlowat }, .send_pkt = vhost_transport_send_pkt, diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h index ebb3ce63d64d..97dc1bebc69c 100644 --- a/include/linux/virtio_vsock.h +++ b/include/linux/virtio_vsock.h @@ -256,4 +256,5 @@ void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); void virtio_transport_deliver_tap_pkt(struct sk_buff *skb); int virtio_transport_purge_skbs(void *vsk, struct sk_buff_head *list); int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t read_actor); +int virtio_transport_set_rcvlowat(struct vsock_sock *vsk, int val); #endif /* _LINUX_VIRTIO_VSOCK_H */ diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index af5bab1acee1..cf3431189d0c 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -539,6 +539,8 @@ static struct virtio_transport virtio_transport = { .notify_buffer_size = virtio_transport_notify_buffer_size, .read_skb = virtio_transport_read_skb, + + .set_rcvlowat = virtio_transport_set_rcvlowat }, .send_pkt = virtio_transport_send_pkt, diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index f6dc896bf44c..4acee21b4350 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -1684,6 +1684,34 @@ int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t recv_acto } EXPORT_SYMBOL_GPL(virtio_transport_read_skb); +int virtio_transport_set_rcvlowat(struct vsock_sock *vsk, int val) +{ + struct virtio_vsock_sock *vvs = vsk->trans; + bool send_update; + + spin_lock_bh(&vvs->rx_lock); + + /* If number of available bytes is less than new + * SO_RCVLOWAT value, kick sender to send more + * data, because sender may sleep in its 'send()' + * syscall waiting for enough space at our side. + */ + send_update = vvs->rx_bytes < val; + + spin_unlock_bh(&vvs->rx_lock); + + if (send_update) { + int err; + + err = virtio_transport_send_credit_update(vsk); + if (err < 0) + return err; + } + + return 0; +} +EXPORT_SYMBOL_GPL(virtio_transport_set_rcvlowat); + MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Asias He"); MODULE_DESCRIPTION("common code for virtio vsock"); diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c index 048640167411..388c157f6633 100644 --- a/net/vmw_vsock/vsock_loopback.c +++ b/net/vmw_vsock/vsock_loopback.c @@ -98,6 +98,8 @@ static struct virtio_transport loopback_transport = { .notify_buffer_size = virtio_transport_notify_buffer_size, .read_skb = virtio_transport_read_skb, + + .set_rcvlowat = virtio_transport_set_rcvlowat }, .send_pkt = vsock_loopback_send_pkt,