From patchwork Thu Oct 12 07:44:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heng Qi X-Patchwork-Id: 13418461 X-Patchwork-Delegate: kuba@kernel.org 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 CF8F715EAE for ; Thu, 12 Oct 2023 07:44:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from out30-101.freemail.mail.aliyun.com (out30-101.freemail.mail.aliyun.com [115.124.30.101]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D9FAC4 for ; Thu, 12 Oct 2023 00:44:19 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R141e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046051;MF=hengqi@linux.alibaba.com;NM=1;PH=DS;RN=14;SR=0;TI=SMTPD_---0VtzkV7J_1697096654; Received: from localhost(mailfrom:hengqi@linux.alibaba.com fp:SMTPD_---0VtzkV7J_1697096654) by smtp.aliyun-inc.com; Thu, 12 Oct 2023 15:44:15 +0800 From: Heng Qi To: Jason Wang , "Michael S. Tsirkin" , netdev@vger.kernel.org, virtualization@lists.linux-foundation.org Cc: Xuan Zhuo , Eric Dumazet , "David S. Miller" , Paolo Abeni , Jesper Dangaard Brouer , John Fastabend , Alexei Starovoitov , Jakub Kicinski , Simon Horman , "Liu, Yujie" Subject: [PATCH net-next 4/5] virtio-net: support rx netdim Date: Thu, 12 Oct 2023 15:44:08 +0800 Message-Id: X-Mailer: git-send-email 2.19.1.6.gb485710b In-Reply-To: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, 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 X-Patchwork-Delegate: kuba@kernel.org By comparing the traffic information in the complete napi processes, let the virtio-net driver automatically adjust the coalescing moderation parameters of each receive queue. Signed-off-by: Heng Qi --- drivers/net/virtio_net.c | 147 +++++++++++++++++++++++++++++++++------ 1 file changed, 126 insertions(+), 21 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index caef78bb3963..6ad2890a7909 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -172,6 +173,17 @@ struct receive_queue { struct virtnet_rq_stats stats; + /* The number of rx notifications */ + u16 calls; + + /* Is dynamic interrupt moderation enabled? */ + bool dim_enabled; + + /* Dynamic Interrupt Moderation */ + struct dim dim; + + u32 packets_in_napi; + struct virtnet_interrupt_coalesce intr_coal; /* Chain pages by the private ptr. */ @@ -305,6 +317,9 @@ struct virtnet_info { u8 duplex; u32 speed; + /* Is rx dynamic interrupt moderation enabled? */ + bool rx_dim_enabled; + /* Interrupt coalescing settings */ struct virtnet_interrupt_coalesce intr_coal_tx; struct virtnet_interrupt_coalesce intr_coal_rx; @@ -2001,6 +2016,7 @@ static void skb_recv_done(struct virtqueue *rvq) struct virtnet_info *vi = rvq->vdev->priv; struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; + rq->calls++; virtqueue_napi_schedule(&rq->napi, rvq); } @@ -2138,6 +2154,25 @@ static void virtnet_poll_cleantx(struct receive_queue *rq) } } +static void virtnet_rx_dim_work(struct work_struct *work); + +static void virtnet_rx_dim_update(struct virtnet_info *vi, struct receive_queue *rq) +{ + struct virtnet_rq_stats *stats = &rq->stats; + struct dim_sample cur_sample = {}; + + if (!rq->packets_in_napi) + return; + + u64_stats_update_begin(&rq->stats.syncp); + dim_update_sample(rq->calls, stats->packets, + stats->bytes, &cur_sample); + u64_stats_update_end(&rq->stats.syncp); + + net_dim(&rq->dim, cur_sample); + rq->packets_in_napi = 0; +} + static int virtnet_poll(struct napi_struct *napi, int budget) { struct receive_queue *rq = @@ -2146,17 +2181,22 @@ static int virtnet_poll(struct napi_struct *napi, int budget) struct send_queue *sq; unsigned int received; unsigned int xdp_xmit = 0; + bool napi_complete; virtnet_poll_cleantx(rq); received = virtnet_receive(rq, budget, &xdp_xmit); + rq->packets_in_napi += received; if (xdp_xmit & VIRTIO_XDP_REDIR) xdp_do_flush(); /* Out of packets? */ - if (received < budget) - virtqueue_napi_complete(napi, rq->vq, received); + if (received < budget) { + napi_complete = virtqueue_napi_complete(napi, rq->vq, received); + if (napi_complete && rq->dim_enabled) + virtnet_rx_dim_update(vi, rq); + } if (xdp_xmit & VIRTIO_XDP_TX) { sq = virtnet_xdp_get_sq(vi); @@ -2176,6 +2216,7 @@ static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index) virtnet_napi_tx_disable(&vi->sq[qp_index].napi); napi_disable(&vi->rq[qp_index].napi); xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq); + cancel_work_sync(&vi->rq[qp_index].dim.work); } static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index) @@ -2193,6 +2234,9 @@ static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index) if (err < 0) goto err_xdp_reg_mem_model; + INIT_WORK(&vi->rq[qp_index].dim.work, virtnet_rx_dim_work); + vi->rq[qp_index].dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE; + virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi); virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi); @@ -3335,23 +3379,42 @@ static int virtnet_send_tx_notf_coal_cmds(struct virtnet_info *vi, static int virtnet_send_rx_notf_coal_cmds(struct virtnet_info *vi, struct ethtool_coalesce *ec) { + bool rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce; struct scatterlist sgs_rx; + int i; - vi->ctrl->coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs); - vi->ctrl->coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames); - sg_init_one(&sgs_rx, &vi->ctrl->coal_rx, sizeof(vi->ctrl->coal_rx)); - - if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, - VIRTIO_NET_CTRL_NOTF_COAL_RX_SET, - &sgs_rx)) + if (rx_ctrl_dim_on && (ec->rx_coalesce_usecs != vi->intr_coal_rx.max_usecs || + ec->rx_max_coalesced_frames != vi->intr_coal_rx.max_packets)) return -EINVAL; - /* Save parameters */ - vi->intr_coal_rx.max_usecs = ec->rx_coalesce_usecs; - vi->intr_coal_rx.max_packets = ec->rx_max_coalesced_frames; - for (i = 0; i < vi->max_queue_pairs; i++) { - vi->rq[i].intr_coal.max_usecs = ec->rx_coalesce_usecs; - vi->rq[i].intr_coal.max_packets = ec->rx_max_coalesced_frames; + if (rx_ctrl_dim_on) { + if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL)) { + vi->rx_dim_enabled = true; + for (i = 0; i < vi->max_queue_pairs; i++) + vi->rq[i].dim_enabled = true; + } else { + return -EOPNOTSUPP; + } + } else { + vi->rx_dim_enabled = false; + for (i = 0; i < vi->max_queue_pairs; i++) + vi->rq[i].dim_enabled = false; + + vi->ctrl->coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs); + vi->ctrl->coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames); + sg_init_one(&sgs_rx, &vi->ctrl->coal_rx, sizeof(vi->ctrl->coal_rx)); + + if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, + VIRTIO_NET_CTRL_NOTF_COAL_RX_SET, + &sgs_rx)) + return -EINVAL; + + vi->intr_coal_rx.max_usecs = ec->rx_coalesce_usecs; + vi->intr_coal_rx.max_packets = ec->rx_max_coalesced_frames; + for (i = 0; i < vi->max_queue_pairs; i++) { + vi->rq[i].intr_coal.max_usecs = ec->rx_coalesce_usecs; + vi->rq[i].intr_coal.max_packets = ec->rx_max_coalesced_frames; + } } return 0; @@ -3377,13 +3440,27 @@ static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi, struct ethtool_coalesce *ec, u16 queue) { + bool rx_ctrl_dim_on; + u32 max_usecs, max_packets; int err; - err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, queue, - ec->rx_coalesce_usecs, - ec->rx_max_coalesced_frames); - if (err) - return err; + rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce; + max_usecs = vi->rq[queue].intr_coal.max_usecs; + max_packets = vi->rq[queue].intr_coal.max_packets; + if (rx_ctrl_dim_on && (ec->rx_coalesce_usecs != max_usecs || + ec->rx_max_coalesced_frames != max_packets)) + return -EINVAL; + + if (rx_ctrl_dim_on) { + vi->rq[queue].dim_enabled = true; + } else { + vi->rq[queue].dim_enabled = false; + err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, queue, + ec->rx_coalesce_usecs, + ec->rx_max_coalesced_frames); + if (err) + return err; + } err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, queue, ec->tx_coalesce_usecs, @@ -3394,6 +3471,32 @@ static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi, return 0; } +static void virtnet_rx_dim_work(struct work_struct *work) +{ + struct dim *dim = container_of(work, struct dim, work); + struct receive_queue *rq = container_of(dim, + struct receive_queue, dim); + struct virtnet_info *vi = rq->vq->vdev->priv; + struct net_device *dev = vi->dev; + struct dim_cq_moder update_moder; + int qnum = rq - vi->rq, err; + + update_moder = net_dim_get_rx_moderation(dim->mode, dim->profile_ix); + if (update_moder.usec != vi->rq[qnum].intr_coal.max_usecs || + update_moder.pkts != vi->rq[qnum].intr_coal.max_packets) { + rtnl_lock(); + err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, qnum, + update_moder.usec, + update_moder.pkts); + if (err) + pr_debug("%s: Failed to send dim parameters on rxq%d\n", + dev->name, (int)(rq - vi->rq)); + rtnl_unlock(); + } + + dim->state = DIM_START_MEASURE; +} + static int virtnet_coal_params_supported(struct ethtool_coalesce *ec) { /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL @@ -3475,6 +3578,7 @@ static int virtnet_get_coalesce(struct net_device *dev, ec->tx_coalesce_usecs = vi->intr_coal_tx.max_usecs; ec->tx_max_coalesced_frames = vi->intr_coal_tx.max_packets; ec->rx_max_coalesced_frames = vi->intr_coal_rx.max_packets; + ec->use_adaptive_rx_coalesce = vi->rx_dim_enabled; } else { ec->rx_max_coalesced_frames = 1; @@ -3532,6 +3636,7 @@ static int virtnet_get_per_queue_coalesce(struct net_device *dev, ec->tx_coalesce_usecs = vi->sq[queue].intr_coal.max_usecs; ec->tx_max_coalesced_frames = vi->sq[queue].intr_coal.max_packets; ec->rx_max_coalesced_frames = vi->rq[queue].intr_coal.max_packets; + ec->use_adaptive_rx_coalesce = vi->rq[queue].dim_enabled; } else { ec->rx_max_coalesced_frames = 1; @@ -3657,7 +3762,7 @@ static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info) static const struct ethtool_ops virtnet_ethtool_ops = { .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES | - ETHTOOL_COALESCE_USECS, + ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE_RX, .get_drvinfo = virtnet_get_drvinfo, .get_link = ethtool_op_get_link, .get_ringparam = virtnet_get_ringparam,