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Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , 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 , 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 Subject: [PATCH vhost v2 19/19] virtio_net: sq support premapped mode Date: Fri, 23 Feb 2024 16:27:26 +0800 Message-Id: <20240223082726.52915-20-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240223082726.52915-1-xuanzhuo@linux.alibaba.com> References: <20240223082726.52915-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: 510995f33855 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240223_002807_050830_C143B58F X-CRM114-Status: GOOD ( 17.09 ) X-Spam-Score: -15.7 (---------------) X-Spam-Report: Spam detection software, running on the system "bombadil.infradead.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: If the xsk is enabling, the xsk tx will share the send queue. But the xsk requires that the send queue use the premapped mode. So the send queue must support premapped mode. cmd: sh samples/pktgen/pktgen_sample01_simple.sh -i eth0 \ -s 16 -d 10.0.0.128 -m 00:16:3e:2c:c8:2e -n 0 -p 100 CPU: Intel(R) Xeon(R) Platinum 8369B CPU @ 2.70GHz Content analysis details: (-15.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [115.124.30.133 listed in list.dnswl.org] -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM welcome-list 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -7.5 USER_IN_DEF_SPF_WL From: address is in the default SPF welcome-list -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.5 ENV_AND_HDR_SPF_MATCH Env and Hdr From used in default SPF WL Match -0.0 T_SCC_BODY_TEXT_LINE No description available. 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org If the xsk is enabling, the xsk tx will share the send queue. But the xsk requires that the send queue use the premapped mode. So the send queue must support premapped mode. cmd: sh samples/pktgen/pktgen_sample01_simple.sh -i eth0 \ -s 16 -d 10.0.0.128 -m 00:16:3e:2c:c8:2e -n 0 -p 100 CPU: Intel(R) Xeon(R) Platinum 8369B CPU @ 2.70GHz Machine: ecs.g7.2xlarge(Aliyun) before: 1600010.00 after(no-premapped): 1599966.00 after(premapped): 1600014.00 Signed-off-by: Xuan Zhuo --- drivers/net/virtio_net.c | 136 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 132 insertions(+), 4 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 7715bb7032ec..b83ef6afc4fb 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -146,6 +146,25 @@ struct virtnet_rq_dma { u16 need_sync; }; +struct virtnet_sq_dma { + union { + struct virtnet_sq_dma *next; + void *data; + }; + + u32 num; + + dma_addr_t addr[MAX_SKB_FRAGS + 2]; + u32 len[MAX_SKB_FRAGS + 2]; +}; + +struct virtnet_sq_dma_head { + /* record for kfree */ + void *p; + + struct virtnet_sq_dma *free; +}; + /* Internal representation of a send virtqueue */ struct send_queue { /* Virtqueue associated with this send _queue */ @@ -165,6 +184,8 @@ struct send_queue { /* Record whether sq is in reset state. */ bool reset; + + struct virtnet_sq_dma_head dmainfo; }; /* Internal representation of a receive virtqueue */ @@ -368,6 +389,95 @@ static struct xdp_frame *ptr_to_xdp(void *ptr) return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG); } +static struct virtnet_sq_dma *virtnet_sq_unmap(struct send_queue *sq, void **data) +{ + struct virtnet_sq_dma *d; + int i; + + d = *data; + *data = d->data; + + for (i = 0; i < d->num; ++i) + virtqueue_dma_unmap_page_attrs(sq->vq, d->addr[i], d->len[i], + DMA_TO_DEVICE, 0); + + d->next = sq->dmainfo.free; + sq->dmainfo.free = d; + + return d; +} + +static struct virtnet_sq_dma *virtnet_sq_map_sg(struct send_queue *sq, + int nents, void *data) +{ + struct virtnet_sq_dma *d; + struct scatterlist *sg; + int i; + + if (!sq->dmainfo.free) + return NULL; + + d = sq->dmainfo.free; + sq->dmainfo.free = d->next; + + for_each_sg(sq->sg, sg, nents, i) { + if (virtqueue_dma_map_sg_attrs(sq->vq, sg, DMA_TO_DEVICE, 0)) + goto err; + + d->addr[i] = sg->dma_address; + d->len[i] = sg->length; + } + + d->data = data; + d->num = i; + return d; + +err: + d->num = i; + virtnet_sq_unmap(sq, (void **)&d); + return NULL; +} + +static int virtnet_add_outbuf(struct send_queue *sq, u32 num, void *data) +{ + int ret; + + if (sq->vq->premapped) { + data = virtnet_sq_map_sg(sq, num, data); + if (!data) + return -ENOMEM; + } + + ret = virtqueue_add_outbuf(sq->vq, sq->sg, num, data, GFP_ATOMIC); + if (ret && sq->vq->premapped) + virtnet_sq_unmap(sq, &data); + + return ret; +} + +static int virtnet_sq_init_dma_mate(struct send_queue *sq) +{ + struct virtnet_sq_dma *d; + int num, i; + + num = virtqueue_get_vring_size(sq->vq); + + sq->dmainfo.free = kcalloc(num, sizeof(*sq->dmainfo.free), GFP_KERNEL); + if (!sq->dmainfo.free) + return -ENOMEM; + + sq->dmainfo.p = sq->dmainfo.free; + + for (i = 0; i < num; ++i) { + d = &sq->dmainfo.free[i]; + d->next = d + 1; + } + + d->next = NULL; + + return 0; +} + static void __free_old_xmit(struct send_queue *sq, bool in_napi, struct virtnet_sq_free_stats *stats) { @@ -377,6 +487,9 @@ static void __free_old_xmit(struct send_queue *sq, bool in_napi, while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { ++stats->packets; + if (sq->vq->premapped) + virtnet_sq_unmap(sq, &ptr); + if (!is_xdp_frame(ptr)) { struct sk_buff *skb = ptr; @@ -890,8 +1003,7 @@ static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, skb_frag_size(frag), skb_frag_off(frag)); } - err = virtqueue_add_outbuf(sq->vq, sq->sg, nr_frags + 1, - xdp_to_ptr(xdpf), GFP_ATOMIC); + err = virtnet_add_outbuf(sq, nr_frags + 1, xdp_to_ptr(xdpf)); if (unlikely(err)) return -ENOSPC; /* Caller handle free/refcnt */ @@ -2357,7 +2469,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) return num_sg; num_sg++; } - return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); + return virtnet_add_outbuf(sq, num_sg, skb); } static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) @@ -4166,6 +4278,8 @@ static void virtnet_free_queues(struct virtnet_info *vi) for (i = 0; i < vi->max_queue_pairs; i++) { __netif_napi_del(&vi->rq[i].napi); __netif_napi_del(&vi->sq[i].napi); + + kfree(vi->sq[i].dmainfo.p); } /* We called __netif_napi_del(), @@ -4214,6 +4328,15 @@ static void free_receive_page_frags(struct virtnet_info *vi) static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf) { + struct virtnet_info *vi = vq->vdev->priv; + struct send_queue *sq; + int i = vq2rxq(vq); + + sq = &vi->sq[i]; + + if (sq->vq->premapped) + virtnet_sq_unmap(sq, &buf); + if (!is_xdp_frame(buf)) dev_kfree_skb(buf); else @@ -4327,8 +4450,10 @@ static int virtnet_find_vqs(struct virtnet_info *vi) if (ctx) ctx[rxq2vq(i)] = true; - if (premapped) + if (premapped) { premapped[rxq2vq(i)] = true; + premapped[txq2vq(i)] = true; + } } cfg.nvqs = total_vqs; @@ -4352,6 +4477,9 @@ static int virtnet_find_vqs(struct virtnet_info *vi) vi->rq[i].vq = vqs[rxq2vq(i)]; vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); vi->sq[i].vq = vqs[txq2vq(i)]; + + if (vi->sq[i].vq->premapped) + virtnet_sq_init_dma_mate(&vi->sq[i]); } /* run here: ret == 0. */