From patchwork Mon May 22 07:39:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseniy Krasnov X-Patchwork-Id: 13249928 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 9BAC3C77B73 for ; Mon, 22 May 2023 07:45:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232693AbjEVHpH (ORCPT ); Mon, 22 May 2023 03:45:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34166 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232650AbjEVHot (ORCPT ); Mon, 22 May 2023 03:44:49 -0400 Received: from mx.sberdevices.ru (mx.sberdevices.ru [45.89.227.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF6CBAC; Mon, 22 May 2023 00:44:47 -0700 (PDT) Received: from s-lin-edge02.sberdevices.ru (localhost [127.0.0.1]) by mx.sberdevices.ru (Postfix) with ESMTP id 9F45B5FD4A; Mon, 22 May 2023 10:44:44 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1684741484; bh=igltWeKmorgVWzwhU5OIAduVRvDTNdsf6zEVkCG3inE=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=Z61DpywJ0aT4k7vpr4q4nrwqmpD6kiZ2SfnxKz+zTSGjz8n1yOYZVCaCymWCYnu0I tk/sZtUpfdgvkalLW3u+ICAbImUVU7OCm/VDJsgUSoul2+wv5LyYsMJYD2YKj1AqsL IZflFp3NnZNy8FOQ1PT7O565J8E/eigwsSi6Au/k/TZHTQws9IvO0Sk7QXGgHFE/1i 9XQ8f0ccExKrj7cQqYEMRYVALE0fOkxhctC0gccM8DeSxud/WieJ1Fx7zp8NJcLVF5 C2v22Amx8X0YiR7MtEg9tzQvMMnw/2WDvzQM8AR1CDs7q0cJFzv6w/eKJBSET2HKtu fhu1eC0hUsiyQ== Received: from S-MS-EXCH01.sberdevices.ru (S-MS-EXCH01.sberdevices.ru [172.16.1.4]) by mx.sberdevices.ru (Postfix) with ESMTP; Mon, 22 May 2023 10:44:44 +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 v3 02/17] vhost/vsock: read data from non-linear skb Date: Mon, 22 May 2023 10:39:35 +0300 Message-ID: <20230522073950.3574171-3-AVKrasnov@sberdevices.ru> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20230522073950.3574171-1-AVKrasnov@sberdevices.ru> References: <20230522073950.3574171-1-AVKrasnov@sberdevices.ru> MIME-Version: 1.0 X-Originating-IP: [172.16.1.6] X-ClientProxiedBy: S-MS-EXCH02.sberdevices.ru (172.16.1.5) 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: 2023/05/22 04:49:00 #21364689 X-KSMG-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This adds copying to guest's virtio buffers from non-linear skbs. Such skbs are created by protocol layer when MSG_ZEROCOPY flags is used. It changes call of 'copy_to_iter()' to 'skb_copy_datagram_iter()'. Second function can read data from non-linear skb. See commit to 'net/vmw_vsock/virtio_transport_common.c' with the same name for more details. Signed-off-by: Arseniy Krasnov --- drivers/vhost/vsock.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 6578db78f0ae..b254aa4b756a 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -156,7 +156,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, } iov_iter_init(&iov_iter, ITER_DEST, &vq->iov[out], in, iov_len); - payload_len = skb->len; + payload_len = skb->len - VIRTIO_VSOCK_SKB_CB(skb)->frag_off; hdr = virtio_vsock_hdr(skb); /* If the packet is greater than the space available in the @@ -197,8 +197,10 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, break; } - nbytes = copy_to_iter(skb->data, payload_len, &iov_iter); - if (nbytes != payload_len) { + if (skb_copy_datagram_iter(skb, + VIRTIO_VSOCK_SKB_CB(skb)->frag_off, + &iov_iter, + payload_len)) { kfree_skb(skb); vq_err(vq, "Faulted on copying pkt buf\n"); break; @@ -212,13 +214,13 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, vhost_add_used(vq, head, sizeof(*hdr) + payload_len); added = true; - skb_pull(skb, payload_len); + VIRTIO_VSOCK_SKB_CB(skb)->frag_off += payload_len; total_len += payload_len; /* If we didn't send all the payload we can requeue the packet * to send it with the next available buffer. */ - if (skb->len > 0) { + if (VIRTIO_VSOCK_SKB_CB(skb)->frag_off < skb->len) { hdr->flags |= cpu_to_le32(flags_to_restore); /* We are queueing the same skb to handle