From patchwork Fri Dec 29 07:31:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13506374 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) (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 E12C61171F; Fri, 29 Dec 2023 07:31:35 +0000 (UTC) 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 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046060;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=14;SR=0;TI=SMTPD_---0VzQtfBO_1703835092; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VzQtfBO_1703835092) by smtp.aliyun-inc.com; Fri, 29 Dec 2023 15:31:32 +0800 From: Xuan Zhuo To: netdev@vger.kernel.org Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , virtualization@lists.linux-foundation.org, bpf@vger.kernel.org Subject: [PATCH net-next v3 20/27] virtio_net: separate receive_mergeable Date: Fri, 29 Dec 2023 15:31:01 +0800 Message-Id: <20231229073108.57778-21-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20231229073108.57778-1-xuanzhuo@linux.alibaba.com> References: <20231229073108.57778-1-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: 20112a26898d X-Patchwork-Delegate: kuba@kernel.org This commit separates the function receive_mergeable(), put the logic of appending frag to the skb as an independent function. The subsequent commit will reuse it. Signed-off-by: Xuan Zhuo --- drivers/net/virtio/main.c | 77 ++++++++++++++++++++++++--------------- 1 file changed, 47 insertions(+), 30 deletions(-) diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c index ab1970158d85..212af542bfbe 100644 --- a/drivers/net/virtio/main.c +++ b/drivers/net/virtio/main.c @@ -1401,6 +1401,49 @@ static struct sk_buff *receive_mergeable_xdp(struct net_device *dev, return NULL; } +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) +{ + int num_skb_frags; + int offset; + + num_skb_frags = skb_shinfo(curr_skb)->nr_frags; + if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { + struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); + + if (unlikely(!nskb)) + return NULL; + + if (curr_skb == head_skb) + skb_shinfo(curr_skb)->frag_list = nskb; + else + curr_skb->next = nskb; + curr_skb = nskb; + head_skb->truesize += nskb->truesize; + num_skb_frags = 0; + } + + if (curr_skb != head_skb) { + head_skb->data_len += len; + head_skb->len += len; + head_skb->truesize += truesize; + } + + offset = buf - page_address(page); + if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { + put_page(page); + skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, + len, truesize); + } else { + skb_add_rx_frag(curr_skb, num_skb_frags, page, + offset, len, truesize); + } + + return curr_skb; +} + static struct sk_buff *receive_mergeable(struct net_device *dev, struct virtnet_info *vi, struct virtnet_rq *rq, @@ -1450,8 +1493,6 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, if (unlikely(!curr_skb)) goto err_skb; while (--num_buf) { - int num_skb_frags; - buf = virtnet_rq_get_buf(rq, &len, &ctx); if (unlikely(!buf)) { pr_debug("%s: rx error: %d buffers out of %d missing\n", @@ -1476,34 +1517,10 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, goto err_skb; } - num_skb_frags = skb_shinfo(curr_skb)->nr_frags; - if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { - struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); - - if (unlikely(!nskb)) - goto err_skb; - if (curr_skb == head_skb) - skb_shinfo(curr_skb)->frag_list = nskb; - else - curr_skb->next = nskb; - curr_skb = nskb; - head_skb->truesize += nskb->truesize; - num_skb_frags = 0; - } - if (curr_skb != head_skb) { - head_skb->data_len += len; - head_skb->len += len; - head_skb->truesize += truesize; - } - offset = buf - page_address(page); - if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { - put_page(page); - skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, - len, truesize); - } else { - skb_add_rx_frag(curr_skb, num_skb_frags, page, - offset, len, truesize); - } + curr_skb = virtnet_skb_append_frag(head_skb, curr_skb, page, + buf, len, truesize); + if (!curr_skb) + goto err_skb; } ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);