From patchwork Mon Aug 1 06:39:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12933578 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 C4586C25B06 for ; Mon, 1 Aug 2022 06:43:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238106AbiHAGnF (ORCPT ); Mon, 1 Aug 2022 02:43:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34488 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230321AbiHAGmZ (ORCPT ); Mon, 1 Aug 2022 02:42:25 -0400 Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 290C7165A6; Sun, 31 Jul 2022 23:40:26 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045192;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0VL1cDNf_1659336019; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VL1cDNf_1659336019) by smtp.aliyun-inc.com; Mon, 01 Aug 2022 14:40:20 +0800 From: Xuan Zhuo To: virtualization@lists.linux-foundation.org Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , Mark Gross , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Xuan Zhuo , Vincent Whitchurch , linux-um@lists.infradead.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org, kangjie.xu@linux.alibaba.com Subject: [PATCH v14 40/42] virtio_net: support rx queue resize Date: Mon, 1 Aug 2022 14:39:00 +0800 Message-Id: <20220801063902.129329-41-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220801063902.129329-1-xuanzhuo@linux.alibaba.com> References: <20220801063902.129329-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: 0f12e405b061 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch implements the resize function of the rx queues. Based on this function, it is possible to modify the ring num of the queue. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang --- drivers/net/virtio_net.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index fe4dc43c05a1..1115a8b59a08 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -278,6 +278,8 @@ struct padded_vnet_hdr { char padding[12]; }; +static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); + static bool is_xdp_frame(void *ptr) { return (unsigned long)ptr & VIRTIO_XDP_FLAG; @@ -1846,6 +1848,26 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) return NETDEV_TX_OK; } +static int virtnet_rx_resize(struct virtnet_info *vi, + struct receive_queue *rq, u32 ring_num) +{ + int err, qindex; + + qindex = rq - vi->rq; + + napi_disable(&rq->napi); + + err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); + if (err) + netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); + + if (!try_fill_recv(vi, rq, GFP_KERNEL)) + schedule_delayed_work(&vi->refill, 0); + + virtnet_napi_enable(rq->vq, &rq->napi); + return err; +} + /* * Send command via the control virtqueue and check status. Commands * supported by the hypervisor, as indicated by feature bits, should