From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 4B05A17AD0; Mon, 8 May 2023 06:14:40 +0000 (UTC) Received: from out30-133.freemail.mail.aliyun.com (out30-133.freemail.mail.aliyun.com [115.124.30.133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3940711542; Sun, 7 May 2023 23:14:38 -0700 (PDT) X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R161e4;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=14;SR=0;TI=SMTPD_---0Vi..0DX_1683526473; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0Vi..0DX_1683526473) by smtp.aliyun-inc.com; Mon, 08 May 2023 14:14:34 +0800 From: Xuan Zhuo To: netdev@vger.kernel.org Cc: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , virtualization@lists.linux-foundation.org, bpf@vger.kernel.org Subject: [PATCH net-next v5 14/15] virtio_net: introduce receive_small_build_xdp Date: Mon, 8 May 2023 14:14:16 +0800 Message-Id: <20230508061417.65297-15-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20230508061417.65297-1-xuanzhuo@linux.alibaba.com> References: <20230508061417.65297-1-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: 847ebbc5df1e Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY, USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Simplifying receive_small() function. Bringing the logic relating to build_skb together. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang --- drivers/net/virtio_net.c | 48 ++++++++++++++++++++++++++-------------- 1 file changed, 31 insertions(+), 17 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index a0a4f35b965b..37287ede1959 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -931,6 +931,34 @@ static struct page *xdp_linearize_page(struct receive_queue *rq, return NULL; } +static struct sk_buff *receive_small_build_skb(struct virtnet_info *vi, + unsigned int xdp_headroom, + void *buf, + unsigned int len) +{ + unsigned int header_offset; + unsigned int headroom; + unsigned int buflen; + struct sk_buff *skb; + + header_offset = VIRTNET_RX_PAD + xdp_headroom; + headroom = vi->hdr_len + header_offset; + buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + + skb = build_skb(buf, buflen); + if (!skb) + return NULL; + + skb_reserve(skb, headroom); + skb_put(skb, len); + + buf += header_offset; + memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); + + return skb; +} + static struct sk_buff *receive_small_xdp(struct net_device *dev, struct virtnet_info *vi, struct receive_queue *rq, @@ -1030,9 +1058,6 @@ static struct sk_buff *receive_small(struct net_device *dev, { unsigned int xdp_headroom = (unsigned long)ctx; struct page *page = virt_to_head_page(buf); - unsigned int header_offset; - unsigned int headroom; - unsigned int buflen; struct sk_buff *skb; len -= vi->hdr_len; @@ -1060,20 +1085,9 @@ static struct sk_buff *receive_small(struct net_device *dev, rcu_read_unlock(); } - header_offset = VIRTNET_RX_PAD + xdp_headroom; - headroom = vi->hdr_len + header_offset; - buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); - - skb = build_skb(buf, buflen); - if (!skb) - goto err; - skb_reserve(skb, headroom); - skb_put(skb, len); - - buf += header_offset; - memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); - return skb; + skb = receive_small_build_skb(vi, xdp_headroom, buf, len); + if (likely(skb)) + return skb; err: stats->drops++; -- 2.32.0.3.g01195cf9f