From patchwork Tue Dec 5 06:48:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13479467 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=salutedevices.com header.i=@salutedevices.com header.b="CRcI3yv2" Received: from mx1.sberdevices.ru (mx2.sberdevices.ru [45.89.224.132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24EA911F; Mon, 4 Dec 2023 22:56:33 -0800 (PST) Received: from p-infra-ksmg-sc-msk02 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id C9824120023; Tue, 5 Dec 2023 09:56:29 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru C9824120023 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=salutedevices.com; s=mail; t=1701759389; bh=WYowDerCsMRod1LSxg8POGc9VyqqXmbxhBKTsynplMo=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=CRcI3yv2nRgCIJpCqAhK74b3cjiKKh9a7DtUW3YxHjv0u94oQ0jXQVCBqa4CkWXLl w7mu2/YTVbq7mBiO2phhcpOt38xdILsHcyBCfcgVHU/D2eGtvcwxwdOiWg3jIjKhrB qohdgTrHn5o9n+BH96nbf8IFMSpNRC/+ZusRUSBl9SGF7heqbcga0gzu+iHjOCIcpN 5yj+cmC14x+8KYouaK/9pFlw52dQcehCBnjY73FDQEvfvL6HDLrK6vbZab61fwpdc3 v1OYQcoO//0webK0rse8qGtjV0fEgHP9Avs2cMUs6NBo2HfrWr1K7KkJUIXcOkuDZD cXcblfj00t2GQ== 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; Tue, 5 Dec 2023 09:56:29 +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; Tue, 5 Dec 2023 09:56:29 +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: [PATCH net-next v6 2/4] virtio/vsock: send credit update during setting SO_RCVLOWAT Date: Tue, 5 Dec 2023 09:48:04 +0300 Message-ID: <20231205064806.2851305-3-avkrasnov@salutedevices.com> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20231205064806.2851305-1-avkrasnov@salutedevices.com> References: <20231205064806.2851305-1-avkrasnov@salutedevices.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: p-i-exch-sc-m02.sberdevices.ru (172.16.192.103) 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: 181836 [Dec 05 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: 5 0.3.5 98d108ddd984cca1d7e65e595eac546a62b0144b, {Tracking_from_domain_doesnt_match_to}, salutedevices.com:7.1.1;p-i-exch-sc-m01.sberdevices.ru:7.1.1,5.0.1;100.64.160.123:7.1.2;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;127.0.0.199:7.1.2, 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: 2023/12/05 03:59:00 #22607474 X-KSMG-AntiVirus-Status: Clean, skipped X-Patchwork-Delegate: kuba@kernel.org 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. v3 -> v4: * Fit comment in 'virtio_transport_notify_set_rcvlowat()' to 80 chars. v4 -> v5: * Do not change callbacks order in transport structures. v5 -> v6: * Reorder callbacks in transport structures. * Do to send credit update when 'fwd_cnt' == 'last_fwd_cnt'. drivers/vhost/vsock.c | 1 + include/linux/virtio_vsock.h | 1 + net/vmw_vsock/virtio_transport.c | 1 + net/vmw_vsock/virtio_transport_common.c | 30 +++++++++++++++++++++++++ net/vmw_vsock/vsock_loopback.c | 1 + 5 files changed, 34 insertions(+) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index f75731396b7e..ec20ecff85c7 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -449,6 +449,7 @@ static struct virtio_transport vhost_transport = { .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, .notify_buffer_size = virtio_transport_notify_buffer_size, + .notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat, .read_skb = virtio_transport_read_skb, }, diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h index ebb3ce63d64d..c82089dee0c8 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_notify_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..f495b9e5186b 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -537,6 +537,7 @@ static struct virtio_transport virtio_transport = { .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, .notify_buffer_size = virtio_transport_notify_buffer_size, + .notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat, .read_skb = virtio_transport_read_skb, }, diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index f6dc896bf44c..e137d740804e 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -1684,6 +1684,36 @@ 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_notify_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. Also + * don't send credit update when peer already knows actual value - + * such transmission will be useless. + */ + send_update = (vvs->rx_bytes < val) && + (vvs->fwd_cnt != vvs->last_fwd_cnt); + + 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_notify_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..6dea6119f5b2 100644 --- a/net/vmw_vsock/vsock_loopback.c +++ b/net/vmw_vsock/vsock_loopback.c @@ -96,6 +96,7 @@ static struct virtio_transport loopback_transport = { .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, .notify_buffer_size = virtio_transport_notify_buffer_size, + .notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat, .read_skb = virtio_transport_read_skb, },