From patchwork Mon Feb 6 06:58:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13129376 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A66FC61DA4 for ; Mon, 6 Feb 2023 06:58:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229815AbjBFG6y (ORCPT ); Mon, 6 Feb 2023 01:58:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229733AbjBFG6w (ORCPT ); Mon, 6 Feb 2023 01:58:52 -0500 Received: from mx.sberdevices.ru (mx.sberdevices.ru [45.89.227.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 412CF193F7; Sun, 5 Feb 2023 22:58:26 -0800 (PST) Received: from s-lin-edge02.sberdevices.ru (localhost [127.0.0.1]) by mx.sberdevices.ru (Postfix) with ESMTP id 9C6BE5FD03; Mon, 6 Feb 2023 09:58:24 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1675666704; bh=gM89Sds61a/Ke4wkFmjf14TzPo7acoM8k0Ezfh/OfTE=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=c6de/MpSk/4xBtTgl+FzdDqL4UQ8O5WOgcgBI394fValuTI9p58AwowKSqDOZ/lXn QD9TyM4RcoP9LztoDZWlf7cdBMILvlcrQla9VlTO4SLx3WmmUGBPZBNTDJy6rT+kVB 3gvXKIeKzZYiyr3Dwr7FXUVthyCyugQnK8PP8VHd3IzPkaI4oaVdv/BtJ/nZusHnob NyyIO67bd2t0wrPJagdL8EuwKxYscc3iwc2Ag2i1zN5U56brTP7DoI4I9NmGpPSZdP Uryemcx0D+wdJq3E9LQH6QGAwheuKy+lLP08eXqQ8tucs4vQoxZ0StrIytrXrUOEpZ 9cQ86pcyNzbGg== Received: from S-MS-EXCH01.sberdevices.ru (S-MS-EXCH01.sberdevices.ru [172.16.1.4]) by mx.sberdevices.ru (Postfix) with ESMTP; Mon, 6 Feb 2023 09:58:24 +0300 (MSK) From: Arseniy Krasnov To: Stefan Hajnoczi , Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Arseniy Krasnov , "Krasnov Arseniy" CC: "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "virtualization@lists.linux-foundation.org" , "netdev@vger.kernel.org" , kernel Subject: [RFC PATCH v1 05/12] vsock/virtio: non-linear skb support Thread-Topic: [RFC PATCH v1 05/12] vsock/virtio: non-linear skb support Thread-Index: AQHZOfhn3a4rtLPBJ0ikS/zrL9u2kw== Date: Mon, 6 Feb 2023 06:58:24 +0000 Message-ID: In-Reply-To: <0e7c6fc4-b4a6-a27b-36e9-359597bba2b5@sberdevices.ru> Accept-Language: en-US, ru-RU Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.16.1.12] Content-ID: <4C7B0332DEEF004C81506DE1E7C21622@sberdevices.ru> MIME-Version: 1.0 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: 2023/02/06 01:18:00 #20834045 X-KSMG-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Use pages of non-linear skb as buffers in virtio tx queue. Signed-off-by: Arseniy Krasnov --- net/vmw_vsock/virtio_transport.c | 31 +++++++++++++++++++++++++------ 1 file changed, 25 insertions(+), 6 deletions(-) diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 28b5a8e8e094..b8a7d6dc9f46 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -100,7 +100,8 @@ virtio_transport_send_pkt_work(struct work_struct *work) vq = vsock->vqs[VSOCK_VQ_TX]; for (;;) { - struct scatterlist hdr, buf, *sgs[2]; + struct scatterlist *sgs[MAX_SKB_FRAGS + 1]; + struct scatterlist bufs[MAX_SKB_FRAGS + 1]; int ret, in_sg = 0, out_sg = 0; struct sk_buff *skb; bool reply; @@ -111,12 +112,30 @@ virtio_transport_send_pkt_work(struct work_struct *work) virtio_transport_deliver_tap_pkt(skb); reply = virtio_vsock_skb_reply(skb); + sg_init_one(&bufs[0], virtio_vsock_hdr(skb), sizeof(*virtio_vsock_hdr(skb))); + sgs[out_sg++] = &bufs[0]; + + if (skb_is_nonlinear(skb)) { + int i; + + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + struct page *data_page = skb_shinfo(skb)->frags[i].bv_page; + + /* We will use 'page_to_virt()' for userspace page here, + * because virtio layer will call 'virt_to_phys()' later + * to fill buffer descriptor. We don't touch memory at + * "virtual" address of this page. + */ + sg_init_one(&bufs[i + 1], + page_to_virt(data_page), PAGE_SIZE); + sgs[out_sg++] = &bufs[i + 1]; + } + } else { + if (skb->len > 0) { + sg_init_one(&bufs[1], skb->data, skb->len); + sgs[out_sg++] = &bufs[1]; + } - sg_init_one(&hdr, virtio_vsock_hdr(skb), sizeof(*virtio_vsock_hdr(skb))); - sgs[out_sg++] = &hdr; - if (skb->len > 0) { - sg_init_one(&buf, skb->data, skb->len); - sgs[out_sg++] = &buf; } ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, skb, GFP_KERNEL);