From patchwork Wed Dec 6 21:18:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13482288 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=salutedevices.com header.i=@salutedevices.com header.b="Cuzk563T" Received: from mx1.sberdevices.ru (mx2.sberdevices.ru [45.89.224.132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3798DF7; Wed, 6 Dec 2023 13:27:12 -0800 (PST) Received: from p-infra-ksmg-sc-msk02 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id 0ACFD120037; Thu, 7 Dec 2023 00:27:10 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru 0ACFD120037 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=salutedevices.com; s=mail; t=1701898030; bh=t/kjl2Vjg1LdCA2ZU1r92JWEZ4RRp+5azAC7FUXgjBk=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=Cuzk563TF7WxIIc4ol+sKU/bjzg6wXZS9/h7FAy4laFmOySQmoUXjOLwZjfdgUWDH JJe5lJ3/rSPMv4+vhIgWV4M+yuDTBAKCIb1452QiPfvjWxfqQT3nd4ajcJfpFZwa/v JusSd1atwfGNnb+gOd9vMzk8znAPO08NGaqQe6FzW+J36X0jK4GiQlE266Ae1hemk9 gNHBTQ0ySJEgyPCNRuQpyv0F4Hk+nvGYObDrsxAd9lnUjxdyr9dO94w9t5BO44S8Wg h7bWQ6ANN4m6BGO3ALRnE0etomgqgicZ2at+MjhHfqlmUOfuXEiXm3qAtI8WbhVK5Q QnCP3pEsjXWgQ== 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; Thu, 7 Dec 2023 00:27:09 +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; Thu, 7 Dec 2023 00:27:09 +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 v7 1/4] vsock: update SO_RCVLOWAT setting callback Date: Thu, 7 Dec 2023 00:18:46 +0300 Message-ID: <20231206211849.2707151-2-avkrasnov@salutedevices.com> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20231206211849.2707151-1-avkrasnov@salutedevices.com> References: <20231206211849.2707151-1-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-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: 181917 [Dec 06 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}, d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;100.64.160.123:7.1.2;p-i-exch-sc-m01.sberdevices.ru:7.1.1,5.0.1;127.0.0.199:7.1.2;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: 2023/12/06 19:07:00 #22622451 X-KSMG-AntiVirus-Status: Clean, skipped Do not return if transport callback for SO_RCVLOWAT is set (only in error case). In this case we don't need to set 'sk_rcvlowat' field in each transport - only in 'vsock_set_rcvlowat()'. Also, if 'sk_rcvlowat' is now set only in af_vsock.c, change callback name from 'set_rcvlowat' to 'notify_set_rcvlowat'. Signed-off-by: Arseniy Krasnov Reviewed-by: Stefano Garzarella --- Changelog: v3 -> v4: * Rename 'set_rcvlowat' to 'notify_set_rcvlowat'. * Commit message updated. include/net/af_vsock.h | 2 +- net/vmw_vsock/af_vsock.c | 9 +++++++-- net/vmw_vsock/hyperv_transport.c | 4 ++-- 3 files changed, 10 insertions(+), 5 deletions(-) diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index e302c0e804d0..535701efc1e5 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -137,7 +137,6 @@ struct vsock_transport { u64 (*stream_rcvhiwat)(struct vsock_sock *); bool (*stream_is_active)(struct vsock_sock *); bool (*stream_allow)(u32 cid, u32 port); - int (*set_rcvlowat)(struct vsock_sock *vsk, int val); /* SEQ_PACKET. */ ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg, @@ -168,6 +167,7 @@ struct vsock_transport { struct vsock_transport_send_notify_data *); /* sk_lock held by the caller */ void (*notify_buffer_size)(struct vsock_sock *, u64 *); + int (*notify_set_rcvlowat)(struct vsock_sock *vsk, int val); /* Shutdown. */ int (*shutdown)(struct vsock_sock *, int); diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 816725af281f..54ba7316f808 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -2264,8 +2264,13 @@ static int vsock_set_rcvlowat(struct sock *sk, int val) transport = vsk->transport; - if (transport && transport->set_rcvlowat) - return transport->set_rcvlowat(vsk, val); + if (transport && transport->notify_set_rcvlowat) { + int err; + + err = transport->notify_set_rcvlowat(vsk, val); + if (err) + return err; + } WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); return 0; diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c index 7cb1a9d2cdb4..e2157e387217 100644 --- a/net/vmw_vsock/hyperv_transport.c +++ b/net/vmw_vsock/hyperv_transport.c @@ -816,7 +816,7 @@ int hvs_notify_send_post_enqueue(struct vsock_sock *vsk, ssize_t written, } static -int hvs_set_rcvlowat(struct vsock_sock *vsk, int val) +int hvs_notify_set_rcvlowat(struct vsock_sock *vsk, int val) { return -EOPNOTSUPP; } @@ -856,7 +856,7 @@ static struct vsock_transport hvs_transport = { .notify_send_pre_enqueue = hvs_notify_send_pre_enqueue, .notify_send_post_enqueue = hvs_notify_send_post_enqueue, - .set_rcvlowat = hvs_set_rcvlowat + .notify_set_rcvlowat = hvs_notify_set_rcvlowat }; static bool hvs_check_transport(struct vsock_sock *vsk) From patchwork Wed Dec 6 21:18:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13482292 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=salutedevices.com header.i=@salutedevices.com header.b="UXqqBWiV" Received: from mx1.sberdevices.ru (mx1.sberdevices.ru [37.18.73.165]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 382BED4B; Wed, 6 Dec 2023 13:27:12 -0800 (PST) Received: from p-infra-ksmg-sc-msk01 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id 4B19C10008E; Thu, 7 Dec 2023 00:27:10 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru 4B19C10008E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=salutedevices.com; s=mail; t=1701898030; bh=WYowDerCsMRod1LSxg8POGc9VyqqXmbxhBKTsynplMo=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=UXqqBWiVRxMdji3kdeK0n1WbB5ivMMR+Fx/KN6u8tDexoD1bWmvCoZyVHU1nTjxZ7 zbbVEaDOs2gfQ1tHjc7WB/GF5cuuyPXmimguCFOucgbgvSeB4aqV3DTIkhrkwpikMr KJvhDTztbjnp9F+a4qXw8lXHi+KqbQMgpKo7q8Tn4oRDRnbXmNPL6NFkyFJzYvYeUH 4A2ix81dRZqycTiOctsN8mHxp181ZDm4TZ7O3N2hiNaeUT3Gj96412TFCTCOWlSqos GO5rqwOaNXLFrO9YD9Yylax0bEHELuOOSFNlwMcO2I+Ujr1JS9GwWk6IRhvraPFNjt 7RC8nn2NVvTBg== 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; Thu, 7 Dec 2023 00:27:10 +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; Thu, 7 Dec 2023 00:27:09 +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 v7 2/4] virtio/vsock: send credit update during setting SO_RCVLOWAT Date: Thu, 7 Dec 2023 00:18:47 +0300 Message-ID: <20231206211849.2707151-3-avkrasnov@salutedevices.com> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20231206211849.2707151-1-avkrasnov@salutedevices.com> References: <20231206211849.2707151-1-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-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: 181917 [Dec 06 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}, p-i-exch-sc-m01.sberdevices.ru:7.1.1,5.0.1;salutedevices.com:7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;127.0.0.199:7.1.2;100.64.160.123:7.1.2, 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: 2023/12/06 19:07:00 #22622451 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 Reviewed-by: Stefano Garzarella --- 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, }, From patchwork Wed Dec 6 21:18:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13482290 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=salutedevices.com header.i=@salutedevices.com header.b="n8esJVfM" Received: from mx1.sberdevices.ru (mx2.sberdevices.ru [45.89.224.132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38CC0D5C; Wed, 6 Dec 2023 13:27:12 -0800 (PST) Received: from p-infra-ksmg-sc-msk02 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id 7EDFC120066; Thu, 7 Dec 2023 00:27:10 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru 7EDFC120066 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=salutedevices.com; s=mail; t=1701898030; bh=GHNWtOPMCbudLrNVAc3MZd8FL3ABIjio3CjPcM+SRoM=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=n8esJVfMhQwGDoRuF912rYf1+AWbKOjfkBXWNiFGLr418uHCc8qupouUhRs7n+r0Y t1jpV7C86ZSdnY7sqEf50J1DSHQ4JkgZBqJTWO3mweXGxXiteB0lYofMESuPsscfd8 JcBjmvybZSxGoT3B2fYfN4dAAlDkhKMKZu9VLrJAkQM9NEzxH5uLtSTOW08D4lg/Ol Oa3oRBW/yB85O0s/ZJx0EY9YUl8tBY1FmiAc04yEVYEOxX/BErK8Q7Vxu6fZkOSUjd 8KRmz1MpPpGd/0zS7DIq6AjHNRL3NpuI0Rg9x/OI72bz+AeytEaiFNxhTKhyMxsqeZ GIfy5EbNOEHow== 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; Thu, 7 Dec 2023 00:27:10 +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; Thu, 7 Dec 2023 00:27:10 +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 v7 3/4] virtio/vsock: fix logic which reduces credit update messages Date: Thu, 7 Dec 2023 00:18:48 +0300 Message-ID: <20231206211849.2707151-4-avkrasnov@salutedevices.com> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20231206211849.2707151-1-avkrasnov@salutedevices.com> References: <20231206211849.2707151-1-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-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: 181917 [Dec 06 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}, d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;100.64.160.123:7.1.2;p-i-exch-sc-m01.sberdevices.ru:7.1.1,5.0.1;127.0.0.199:7.1.2;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: 2023/12/06 19:07:00 #22622451 X-KSMG-AntiVirus-Status: Clean, skipped Add one more condition for sending credit update during dequeue from stream socket: when number of bytes in the rx queue is smaller than SO_RCVLOWAT value of the socket. This is actual for non-default value of SO_RCVLOWAT (e.g. not 1) - idea is to "kick" peer to continue data transmission, because we need at least SO_RCVLOWAT bytes in our rx queue to wake up user for reading data (in corner case it is also possible to stuck both tx and rx sides, this is why 'Fixes' is used). Also handle case when 'fwd_cnt' wraps, while 'last_fwd_cnt' is still not. Fixes: b89d882dc9fc ("vsock/virtio: reduce credit update messages") Signed-off-by: Arseniy Krasnov --- Changelog: v6 -> v7: * Handle wrap of 'fwd_cnt'. * Do to send credit update when 'fwd_cnt' == 'last_fwd_cnt'. net/vmw_vsock/virtio_transport_common.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index e137d740804e..39f8660d825d 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -558,6 +558,8 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, struct virtio_vsock_sock *vvs = vsk->trans; size_t bytes, total = 0; struct sk_buff *skb; + u32 fwd_cnt_delta; + bool low_rx_bytes; int err = -EFAULT; u32 free_space; @@ -601,7 +603,15 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, } } - free_space = vvs->buf_alloc - (vvs->fwd_cnt - vvs->last_fwd_cnt); + /* Handle wrap of 'fwd_cnt'. */ + if (vvs->fwd_cnt < vvs->last_fwd_cnt) + fwd_cnt_delta = vvs->fwd_cnt + (U32_MAX - vvs->last_fwd_cnt); + else + fwd_cnt_delta = vvs->fwd_cnt - vvs->last_fwd_cnt; + + free_space = vvs->buf_alloc - fwd_cnt_delta; + low_rx_bytes = (vvs->rx_bytes < + sock_rcvlowat(sk_vsock(vsk), 0, INT_MAX)); spin_unlock_bh(&vvs->rx_lock); @@ -611,9 +621,11 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, * too high causes extra messages. Too low causes transmitter * stalls. As stalls are in theory more expensive than extra * messages, we set the limit to a high value. TODO: experiment - * with different values. + * with different values. Also send credit update message when + * number of bytes in rx queue is not enough to wake up reader. */ - if (free_space < VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) + if (fwd_cnt_delta && + (free_space < VIRTIO_VSOCK_MAX_PKT_BUF_SIZE || low_rx_bytes)) virtio_transport_send_credit_update(vsk); return total; From patchwork Wed Dec 6 21:18:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13482291 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=salutedevices.com header.i=@salutedevices.com header.b="Yg8eE3ly" Received: from mx1.sberdevices.ru (mx1.sberdevices.ru [37.18.73.165]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 489F0D5E; Wed, 6 Dec 2023 13:27:12 -0800 (PST) Received: from p-infra-ksmg-sc-msk01 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id E34CD100090; Thu, 7 Dec 2023 00:27:10 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru E34CD100090 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=salutedevices.com; s=mail; t=1701898030; bh=1e6JFGkTGuydknS47ogwt1fc3Spipxhwu/cKBB+RQ8c=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=Yg8eE3lyYHiFPEqJkAdQAn6JwgeJN069b6NlsLVoBbBfS7eezGxLevTsjLshZR4kx hX+VbrfkQRg9aCeevmR1/AxHsvZPXNz43SYJExL/1w58ny4bLqpiWRlFIEUfd93oSO k5+qEX7hR1pkT7JrUjrGV5TKcUG8bORZoLjGBRFE++XHKqH3SiyZqQjYN4z6Si7AKt wZRuiMkLDfWprNQao0I0/ygYL94CFsTUDeT+O9TmFTxrp2NfTC70nf1U1BYRZSGvuf /FjQmRCE8lukGwlGWuxV8GCa7NGja4M5UShiPlhv1Xh7nGlWy01vl0KzTzgVw5ngMy VX3nVlm/80kxg== 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; Thu, 7 Dec 2023 00:27:10 +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; Thu, 7 Dec 2023 00:27:10 +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 v7 4/4] vsock/test: two tests to check credit update logic Date: Thu, 7 Dec 2023 00:18:49 +0300 Message-ID: <20231206211849.2707151-5-avkrasnov@salutedevices.com> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20231206211849.2707151-1-avkrasnov@salutedevices.com> References: <20231206211849.2707151-1-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-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: 181917 [Dec 06 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}, p-i-exch-sc-m01.sberdevices.ru:7.1.1,5.0.1;salutedevices.com:7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;127.0.0.199:7.1.2;100.64.160.123:7.1.2, 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: 2023/12/06 19:07:00 #22622451 X-KSMG-AntiVirus-Status: Clean, skipped Both tests are almost same, only differs in two 'if' conditions, so implemented in a single function. Tests check, that credit update message is sent: 1) During setting SO_RCVLOWAT value of the socket. 2) When number of 'rx_bytes' become smaller than SO_RCVLOWAT value. Signed-off-by: Arseniy Krasnov Reviewed-by: Stefano Garzarella --- Changelog: v1 -> v2: * Update commit message by removing 'This patch adds XXX' manner. * Update commit message by adding details about dependency for this test from kernel internal define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE. * Add comment for this dependency in 'vsock_test.c' where this define is duplicated. v2 -> v3: * Replace synchronization based on control TCP socket with vsock data socket - this is needed to allow sender transmit data only when new buffer size of receiver is visible to sender. Otherwise there is race and test fails sometimes. v3 -> v4: * Replace 'recv_buf()' to 'recv(MSG_DONTWAIT)' in last read operation in server part. This is needed to ensure that 'poll()' wake up us when number of bytes ready to read is equal to SO_RCVLOWAT value. v4 -> v5: * Use 'recv_buf(MSG_DONTWAIT)' instead of 'recv(MSG_DONTWAIT)'. v5 -> v6: * Add second test which checks, that credit update is sent during reading data from socket. * Update commit message. tools/testing/vsock/vsock_test.c | 175 +++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c index 01fa816868bc..66246d81d654 100644 --- a/tools/testing/vsock/vsock_test.c +++ b/tools/testing/vsock/vsock_test.c @@ -1232,6 +1232,171 @@ static void test_double_bind_connect_client(const struct test_opts *opts) } } +#define RCVLOWAT_CREDIT_UPD_BUF_SIZE (1024 * 128) +/* This define is the same as in 'include/linux/virtio_vsock.h': + * it is used to decide when to send credit update message during + * reading from rx queue of a socket. Value and its usage in + * kernel is important for this test. + */ +#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64) + +static void test_stream_rcvlowat_def_cred_upd_client(const struct test_opts *opts) +{ + size_t buf_size; + void *buf; + int fd; + + fd = vsock_stream_connect(opts->peer_cid, 1234); + if (fd < 0) { + perror("connect"); + exit(EXIT_FAILURE); + } + + /* Send 1 byte more than peer's buffer size. */ + buf_size = RCVLOWAT_CREDIT_UPD_BUF_SIZE + 1; + + buf = malloc(buf_size); + if (!buf) { + perror("malloc"); + exit(EXIT_FAILURE); + } + + /* Wait until peer sets needed buffer size. */ + recv_byte(fd, 1, 0); + + if (send(fd, buf, buf_size, 0) != buf_size) { + perror("send failed"); + exit(EXIT_FAILURE); + } + + free(buf); + close(fd); +} + +static void test_stream_credit_update_test(const struct test_opts *opts, + bool low_rx_bytes_test) +{ + size_t recv_buf_size; + struct pollfd fds; + size_t buf_size; + void *buf; + int fd; + + fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL); + if (fd < 0) { + perror("accept"); + exit(EXIT_FAILURE); + } + + buf_size = RCVLOWAT_CREDIT_UPD_BUF_SIZE; + + if (setsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_SIZE, + &buf_size, sizeof(buf_size))) { + perror("setsockopt(SO_VM_SOCKETS_BUFFER_SIZE)"); + exit(EXIT_FAILURE); + } + + if (low_rx_bytes_test) { + /* Set new SO_RCVLOWAT here. This enables sending credit + * update when number of bytes if our rx queue become < + * SO_RCVLOWAT value. + */ + recv_buf_size = 1 + VIRTIO_VSOCK_MAX_PKT_BUF_SIZE; + + if (setsockopt(fd, SOL_SOCKET, SO_RCVLOWAT, + &recv_buf_size, sizeof(recv_buf_size))) { + perror("setsockopt(SO_RCVLOWAT)"); + exit(EXIT_FAILURE); + } + } + + /* Send one dummy byte here, because 'setsockopt()' above also + * sends special packet which tells sender to update our buffer + * size. This 'send_byte()' will serialize such packet with data + * reads in a loop below. Sender starts transmission only when + * it receives this single byte. + */ + send_byte(fd, 1, 0); + + buf = malloc(buf_size); + if (!buf) { + perror("malloc"); + exit(EXIT_FAILURE); + } + + /* Wait until there will be 128KB of data in rx queue. */ + while (1) { + ssize_t res; + + res = recv(fd, buf, buf_size, MSG_PEEK); + if (res == buf_size) + break; + + if (res <= 0) { + fprintf(stderr, "unexpected 'recv()' return: %zi\n", res); + exit(EXIT_FAILURE); + } + } + + /* There is 128KB of data in the socket's rx queue, dequeue first + * 64KB, credit update is sent if 'low_rx_bytes_test' == true. + * Otherwise, credit update is sent in 'if (!low_rx_bytes_test)'. + */ + recv_buf_size = VIRTIO_VSOCK_MAX_PKT_BUF_SIZE; + recv_buf(fd, buf, recv_buf_size, 0, recv_buf_size); + + if (!low_rx_bytes_test) { + recv_buf_size++; + + /* Updating SO_RCVLOWAT will send credit update. */ + if (setsockopt(fd, SOL_SOCKET, SO_RCVLOWAT, + &recv_buf_size, sizeof(recv_buf_size))) { + perror("setsockopt(SO_RCVLOWAT)"); + exit(EXIT_FAILURE); + } + } + + fds.fd = fd; + fds.events = POLLIN | POLLRDNORM | POLLERR | + POLLRDHUP | POLLHUP; + + /* This 'poll()' will return once we receive last byte + * sent by client. + */ + if (poll(&fds, 1, -1) < 0) { + perror("poll"); + exit(EXIT_FAILURE); + } + + if (fds.revents & POLLERR) { + fprintf(stderr, "'poll()' error\n"); + exit(EXIT_FAILURE); + } + + if (fds.revents & (POLLIN | POLLRDNORM)) { + recv_buf(fd, buf, recv_buf_size, MSG_DONTWAIT, recv_buf_size); + } else { + /* These flags must be set, as there is at + * least 64KB of data ready to read. + */ + fprintf(stderr, "POLLIN | POLLRDNORM expected\n"); + exit(EXIT_FAILURE); + } + + free(buf); + close(fd); +} + +static void test_stream_cred_upd_on_low_rx_bytes(const struct test_opts *opts) +{ + test_stream_credit_update_test(opts, true); +} + +static void test_stream_cred_upd_on_set_rcvlowat(const struct test_opts *opts) +{ + test_stream_credit_update_test(opts, false); +} + static struct test_case test_cases[] = { { .name = "SOCK_STREAM connection reset", @@ -1342,6 +1507,16 @@ static struct test_case test_cases[] = { .run_client = test_double_bind_connect_client, .run_server = test_double_bind_connect_server, }, + { + .name = "SOCK_STREAM virtio credit update + SO_RCVLOWAT", + .run_client = test_stream_rcvlowat_def_cred_upd_client, + .run_server = test_stream_cred_upd_on_set_rcvlowat, + }, + { + .name = "SOCK_STREAM virtio credit update + low rx_bytes", + .run_client = test_stream_rcvlowat_def_cred_upd_client, + .run_server = test_stream_cred_upd_on_low_rx_bytes, + }, {}, };