From nobody Wed Sep 10 02:52:25 2025 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 4FDBEC41513 for ; Thu, 27 Jul 2023 22:32:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232893AbjG0WcT (ORCPT ); Thu, 27 Jul 2023 18:32:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46658 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232774AbjG0WcQ (ORCPT ); Thu, 27 Jul 2023 18:32:16 -0400 Received: from mx1.sberdevices.ru (mx1.sberdevices.ru [37.18.73.165]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5601530C0; Thu, 27 Jul 2023 15:32:14 -0700 (PDT) Received: from p-infra-ksmg-sc-msk01 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id C3E2C10000B; Fri, 28 Jul 2023 01:32:12 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru C3E2C10000B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1690497132; bh=ELg8tdObHqRyBIr3ossHVFNdgqgdC5F8jC1bSiv1HnA=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=GnlgzL0qP1Gougz/TOc/NWoV7oXH1TyaFavUhOmmftTpeN7d895WXMz3e1Rwji9rH 272cBVe8PjFa6Zduuc2vqbaKop3c7u/D6x+/ctnssm8kWPZRbyvJo+LcR9xDgrvu7L NyQOSecFilNtoBew5OG0GoYWLIgRCwhCquWrMaWBrqZFYYFMurvubxIFGOtRZ3VVVd avilfwK/n4w5Pb1j9N5SKr2OwIBLfdefZ+6tf8kX7e9wcnbq5Iy30ITwm0cNoeQ5fx 5YNUqdAZmPC9Ul550tyop2XQvFFhWPZSdN0j0beR4Jpu1L+KG4CQN6CU68YfznszcX 6q1FfgRn09LhQ== 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; Fri, 28 Jul 2023 01:32:12 +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 15.2.1118.30; Fri, 28 Jul 2023 01:31:52 +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: , , , , , , , Arseniy Krasnov Subject: [PATCH net-next v4 3/4] vsock/virtio: non-linear skb handling for tap Date: Fri, 28 Jul 2023 01:26:26 +0300 Message-ID: <20230727222627.1895355-4-AVKrasnov@sberdevices.ru> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20230727222627.1895355-1-AVKrasnov@sberdevices.ru> References: <20230727222627.1895355-1-AVKrasnov@sberdevices.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [100.64.160.123] 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: 178796 [Jul 22 2023] X-KSMG-AntiSpam-Version: 5.9.59.0 X-KSMG-AntiSpam-Envelope-From: AVKrasnov@sberdevices.ru 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: 525 525 723604743bfbdb7e16728748c3fa45e9eba05f7d, {Tracking_from_domain_doesnt_match_to}, 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: 2023/07/23 08:49:00 #21663637 X-KSMG-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" For tap device new skb is created and data from the current skb is copied to it. This adds copying data from non-linear skb to new the skb. Signed-off-by: Arseniy Krasnov Reviewed-by: Stefano Garzarella --- net/vmw_vsock/virtio_transport_common.c | 31 ++++++++++++++++++++++--- 1 file changed, 28 insertions(+), 3 deletions(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio= _transport_common.c index 0b6a89139810..de7b44675254 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -106,6 +106,27 @@ virtio_transport_alloc_skb(struct virtio_vsock_pkt_inf= o *info, return NULL; } =20 +static void virtio_transport_copy_nonlinear_skb(const struct sk_buff *skb, + void *dst, + size_t len) +{ + struct iov_iter iov_iter =3D { 0 }; + struct kvec kvec; + size_t to_copy; + + kvec.iov_base =3D dst; + kvec.iov_len =3D len; + + iov_iter.iter_type =3D ITER_KVEC; + iov_iter.kvec =3D &kvec; + iov_iter.nr_segs =3D 1; + + to_copy =3D min_t(size_t, len, skb->len); + + skb_copy_datagram_iter(skb, VIRTIO_VSOCK_SKB_CB(skb)->frag_off, + &iov_iter, to_copy); +} + /* Packet capture */ static struct sk_buff *virtio_transport_build_skb(void *opaque) { @@ -114,7 +135,6 @@ static struct sk_buff *virtio_transport_build_skb(void = *opaque) struct af_vsockmon_hdr *hdr; struct sk_buff *skb; size_t payload_len; - void *payload_buf; =20 /* A packet could be split to fit the RX buffer, so we can retrieve * the payload length from the header and the buffer pointer taking @@ -122,7 +142,6 @@ static struct sk_buff *virtio_transport_build_skb(void = *opaque) */ pkt_hdr =3D virtio_vsock_hdr(pkt); payload_len =3D pkt->len; - payload_buf =3D pkt->data; =20 skb =3D alloc_skb(sizeof(*hdr) + sizeof(*pkt_hdr) + payload_len, GFP_ATOMIC); @@ -165,7 +184,13 @@ static struct sk_buff *virtio_transport_build_skb(void= *opaque) skb_put_data(skb, pkt_hdr, sizeof(*pkt_hdr)); =20 if (payload_len) { - skb_put_data(skb, payload_buf, payload_len); + if (skb_is_nonlinear(pkt)) { + void *data =3D skb_put(skb, payload_len); + + virtio_transport_copy_nonlinear_skb(pkt, data, payload_len); + } else { + skb_put_data(skb, pkt->data, payload_len); + } } =20 return skb; --=20 2.25.1