From patchwork Fri Jul 5 07:37:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13724480 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-118.freemail.mail.aliyun.com (out30-118.freemail.mail.aliyun.com [115.124.30.118]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B4086145330; Fri, 5 Jul 2024 07:37:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.118 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720165076; cv=none; b=mLGKeGcqGNB9raaO9Z+Bvel+dqQ62itAsvAqF9xfWMFoxghzV63IQ/5NmjQxBlgTQsafSythpB32fUPjgPSQICgXDuLXnmTSYFW//8FPra/oBOL3Kalo7KB8SGOMQ7HMQz0r6zvKe2j1LigUzUuy5AFRax5NYK3I6p1bOFGS1rA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720165076; c=relaxed/simple; bh=bCWFnpj9o4+DpBTMgUBEoOAo1WULrZdndvRQAbBqfIU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=beD0jUwjxnKNWIssB0UjdzjK06HxXWwTmJ8OlEZtuDgz/8a6FQsPuEIAbGpF+Z/bDbOYm2gRTnPG3DPzuDZsPcPSdYxO0Gr3/wwC1RTLxi6a810ErNfE16KCunIgOSwhR/UFyvip52319VLNpeK0mNHrsk9Z5xm20oM3RZLgCRg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=dVpTUb1X; arc=none smtp.client-ip=115.124.30.118 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="dVpTUb1X" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1720165065; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=eSqZLYw1tnfN969d85a/aQLFRowDtR6gMpOsMidxQW0=; b=dVpTUb1X2FBg4szybyal7vzHRGXwl7NCYkD+E0aBan9rT6bc8SJnZQySySCKpEEfEMsw9twjRJdI1wNJZVU5GuQ//xYTU9huJ2MXI2YQcwWbAfg1YBBai6ZAOXAq9GOvOgyU448FlobnFPReJzi8Tj/ZRMp26G7qgEG2/ijLrwk= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R101e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037067112;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=15;SR=0;TI=SMTPD_---0W9u53qw_1720165064; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W9u53qw_1720165064) by smtp.aliyun-inc.com; Fri, 05 Jul 2024 15:37:45 +0800 From: Xuan Zhuo To: netdev@vger.kernel.org Cc: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , virtualization@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH net-next v7 10/10] virtio_net: xsk: rx: support recv merge mode Date: Fri, 5 Jul 2024 15:37:34 +0800 Message-Id: <20240705073734.93905-11-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240705073734.93905-1-xuanzhuo@linux.alibaba.com> References: <20240705073734.93905-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: bfc652b69f2c X-Patchwork-Delegate: kuba@kernel.org Support AF-XDP for merge mode. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang --- v7: 1. include the handle for unused buffers drivers/net/virtio_net.c | 144 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) -- 2.32.0.3.g01195cf9f diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 64d8cd481890..67724e7ab5e8 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -504,6 +504,10 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp, struct virtnet_rq_stats *stats); static void virtnet_receive_done(struct virtnet_info *vi, struct receive_queue *rq, struct sk_buff *skb, u8 flags); +static struct sk_buff *virtnet_skb_append_frag(struct sk_buff *head_skb, + struct sk_buff *curr_skb, + struct page *page, void *buf, + int len, int truesize); static bool is_xdp_frame(void *ptr) { @@ -984,6 +988,11 @@ static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf) rq = &vi->rq[i]; + if (rq->xsk_pool) { + xsk_buff_free((struct xdp_buff *)buf); + return; + } + if (!vi->big_packets || vi->mergeable_rx_bufs) virtnet_rq_unmap(rq, buf, 0); @@ -1152,6 +1161,139 @@ static struct sk_buff *virtnet_receive_xsk_small(struct net_device *dev, struct } } +static void xsk_drop_follow_bufs(struct net_device *dev, + struct receive_queue *rq, + u32 num_buf, + struct virtnet_rq_stats *stats) +{ + struct xdp_buff *xdp; + u32 len; + + while (num_buf-- > 1) { + xdp = virtqueue_get_buf(rq->vq, &len); + if (unlikely(!xdp)) { + pr_debug("%s: rx error: %d buffers missing\n", + dev->name, num_buf); + DEV_STATS_INC(dev, rx_length_errors); + break; + } + u64_stats_add(&stats->bytes, len); + xsk_buff_free(xdp); + } +} + +static int xsk_append_merge_buffer(struct virtnet_info *vi, + struct receive_queue *rq, + struct sk_buff *head_skb, + u32 num_buf, + struct virtio_net_hdr_mrg_rxbuf *hdr, + struct virtnet_rq_stats *stats) +{ + struct sk_buff *curr_skb; + struct xdp_buff *xdp; + u32 len, truesize; + struct page *page; + void *buf; + + curr_skb = head_skb; + + while (--num_buf) { + buf = virtqueue_get_buf(rq->vq, &len); + if (unlikely(!buf)) { + pr_debug("%s: rx error: %d buffers out of %d missing\n", + vi->dev->name, num_buf, + virtio16_to_cpu(vi->vdev, + hdr->num_buffers)); + DEV_STATS_INC(vi->dev, rx_length_errors); + return -EINVAL; + } + + u64_stats_add(&stats->bytes, len); + + xdp = buf_to_xdp(vi, rq, buf, len); + if (!xdp) + goto err; + + buf = napi_alloc_frag(len); + if (!buf) { + xsk_buff_free(xdp); + goto err; + } + + memcpy(buf, xdp->data - vi->hdr_len, len); + + xsk_buff_free(xdp); + + page = virt_to_page(buf); + + truesize = len; + + curr_skb = virtnet_skb_append_frag(head_skb, curr_skb, page, + buf, len, truesize); + if (!curr_skb) { + put_page(page); + goto err; + } + } + + return 0; + +err: + xsk_drop_follow_bufs(vi->dev, rq, num_buf, stats); + return -EINVAL; +} + +static struct sk_buff *virtnet_receive_xsk_merge(struct net_device *dev, struct virtnet_info *vi, + struct receive_queue *rq, struct xdp_buff *xdp, + unsigned int *xdp_xmit, + struct virtnet_rq_stats *stats) +{ + struct virtio_net_hdr_mrg_rxbuf *hdr; + struct bpf_prog *prog; + struct sk_buff *skb; + u32 ret, num_buf; + + hdr = xdp->data - vi->hdr_len; + num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); + + ret = XDP_PASS; + rcu_read_lock(); + prog = rcu_dereference(rq->xdp_prog); + /* TODO: support multi buffer. */ + if (prog && num_buf == 1) + ret = virtnet_xdp_handler(prog, xdp, dev, xdp_xmit, stats); + rcu_read_unlock(); + + switch (ret) { + case XDP_PASS: + skb = xsk_construct_skb(rq, xdp); + if (!skb) + goto drop_bufs; + + if (xsk_append_merge_buffer(vi, rq, skb, num_buf, hdr, stats)) { + dev_kfree_skb(skb); + goto drop; + } + + return skb; + + case XDP_TX: + case XDP_REDIRECT: + return NULL; + + default: + /* drop packet */ + xsk_buff_free(xdp); + } + +drop_bufs: + xsk_drop_follow_bufs(dev, rq, num_buf, stats); + +drop: + u64_stats_inc(&stats->drops); + return NULL; +} + static void virtnet_receive_xsk_buf(struct virtnet_info *vi, struct receive_queue *rq, void *buf, u32 len, unsigned int *xdp_xmit, @@ -1181,6 +1323,8 @@ static void virtnet_receive_xsk_buf(struct virtnet_info *vi, struct receive_queu if (!vi->mergeable_rx_bufs) skb = virtnet_receive_xsk_small(dev, vi, rq, xdp, xdp_xmit, stats); + else + skb = virtnet_receive_xsk_merge(dev, vi, rq, xdp, xdp_xmit, stats); if (skb) virtnet_receive_done(vi, rq, skb, flags);