From patchwork Sun Apr 23 19:26:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13221450 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 D4613C7EE22 for ; Sun, 23 Apr 2023 19:31:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230134AbjDWTbc (ORCPT ); Sun, 23 Apr 2023 15:31:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56230 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229727AbjDWTb0 (ORCPT ); Sun, 23 Apr 2023 15:31:26 -0400 Received: from mx.sberdevices.ru (mx.sberdevices.ru [45.89.227.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D199CE5D; Sun, 23 Apr 2023 12:31:22 -0700 (PDT) Received: from s-lin-edge02.sberdevices.ru (localhost [127.0.0.1]) by mx.sberdevices.ru (Postfix) with ESMTP id 76FF95FD0F; Sun, 23 Apr 2023 22:31:19 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1682278279; bh=128uVYJJSNoHFD3kGZjfuSpswzUfi8bmAzZ5GBW0jlI=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=avki5sF9HFF3jZi/0aQea8KpgbSoH5UEWz/W5/c3O+fuiFMsdoFX0oLgSGnMwm050 fHcKKs1S6q9nu8kYHYbUt2a9stGdqZr4VUDENZ8IcbYeZ+deDsOO6KhSIBqDqxq4J3 cCEkYmgGDyzGAkLeli+LH0afWcB3FMDmG292rAYcGZ8fmrQ+BiXRt7dKabhuneG6O7 ivSI/+IjtlGzBsyWRjyEQtVL5IQtyGkWzmxJENuioSPsGlIGhOKOi4rVw7+mppNiw1 ZiXpiNBHW1FqysL3IYXutNppnyXPRlA9I2hvhMD5/fecckih6ib9AD8pqQ9TVpIHz3 S3zwbbroUAA7g== Received: from S-MS-EXCH01.sberdevices.ru (S-MS-EXCH01.sberdevices.ru [172.16.1.4]) by mx.sberdevices.ru (Postfix) with ESMTP; Sun, 23 Apr 2023 22:31:19 +0300 (MSK) 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: [RFC PATCH v2 04/15] vsock/virtio: non-linear skb handling for tap Date: Sun, 23 Apr 2023 22:26:32 +0300 Message-ID: <20230423192643.1537470-5-AVKrasnov@sberdevices.ru> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20230423192643.1537470-1-AVKrasnov@sberdevices.ru> References: <20230423192643.1537470-1-AVKrasnov@sberdevices.ru> MIME-Version: 1.0 X-Originating-IP: [172.16.1.6] X-ClientProxiedBy: S-MS-EXCH01.sberdevices.ru (172.16.1.4) To S-MS-EXCH01.sberdevices.ru (172.16.1.4) 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: 2023/04/23 16:01:00 #21150277 X-KSMG-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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 --- 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 b901017b9f92..280497d97076 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -101,6 +101,27 @@ virtio_transport_alloc_skb(struct virtio_vsock_pkt_info *info, return NULL; } +int virtio_transport_nl_skb_to_iov(struct sk_buff *skb, + struct iov_iter *iov_iter, + size_t len, + bool peek); +static void virtio_transport_copy_nonlinear_skb(struct sk_buff *skb, + void *dst, + size_t len) +{ + struct iov_iter iov_iter = { 0 }; + struct iovec iovec; + + iovec.iov_base = dst; + iovec.iov_len = len; + + iov_iter.iter_type = ITER_IOVEC; + iov_iter.iov = &iovec; + iov_iter.nr_segs = 1; + + virtio_transport_nl_skb_to_iov(skb, &iov_iter, len, false); +} + /* Packet capture */ static struct sk_buff *virtio_transport_build_skb(void *opaque) { @@ -109,7 +130,6 @@ 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; /* 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 @@ -117,7 +137,6 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque) */ pkt_hdr = virtio_vsock_hdr(pkt); payload_len = pkt->len; - payload_buf = pkt->data; skb = alloc_skb(sizeof(*hdr) + sizeof(*pkt_hdr) + payload_len, GFP_ATOMIC); @@ -160,7 +179,13 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque) skb_put_data(skb, pkt_hdr, sizeof(*pkt_hdr)); if (payload_len) { - skb_put_data(skb, payload_buf, payload_len); + if (skb_is_nonlinear(pkt)) { + void *data = skb_put(skb, payload_len); + + virtio_transport_copy_nonlinear_skb(pkt, data, payload_len); + } else { + skb_put_data(skb, pkt->data, payload_len); + } } return skb;