Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751955Ab3EPUbU (ORCPT ); Thu, 16 May 2013 16:31:20 -0400 Received: from g5t0009.atlanta.hp.com ([15.192.0.46]:22407 "EHLO g5t0009.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751164Ab3EPUbS (ORCPT ); Thu, 16 May 2013 16:31:18 -0400 From: Sriram Narasimhan To: mst@redhat.com, rusty@rustcorp.com.au Cc: virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Sriram Narasimhan Subject: [PATCH] virtio-net: Reporting traffic queue distribution statistics through ethtool Date: Thu, 16 May 2013 13:24:29 -0700 Message-Id: <1368735869-31076-1-git-send-email-sriram.narasimhan@hp.com> X-Mailer: git-send-email 1.7.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8732 Lines: 297 This patch allows virtio-net driver to report traffic distribution to inbound/outbound queues through ethtool -S. The per_cpu virtnet_stats is split into receive and transmit stats and are maintained on a per receive_queue and send_queue basis. virtnet_stats() is modified to aggregate interface level statistics from per-queue statistics. Sample output below: NIC statistics: rxq0: rx_packets: 4357802 rxq0: rx_bytes: 292642052 txq0: tx_packets: 824540 txq0: tx_bytes: 55256404 rxq1: rx_packets: 0 rxq1: rx_bytes: 0 txq1: tx_packets: 1094268 txq1: tx_bytes: 73328316 rxq2: rx_packets: 0 rxq2: rx_bytes: 0 txq2: tx_packets: 1091466 txq2: tx_bytes: 73140566 rxq3: rx_packets: 0 rxq3: rx_bytes: 0 txq3: tx_packets: 1093043 txq3: tx_bytes: 73246142 Signed-off-by: Sriram Narasimhan --- drivers/net/virtio_net.c | 157 +++++++++++++++++++++++++++++++++++++--------- 1 files changed, 128 insertions(+), 29 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 3c23fdc..3c58c52 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -41,15 +41,46 @@ module_param(gso, bool, 0444); #define VIRTNET_DRIVER_VERSION "1.0.0" -struct virtnet_stats { - struct u64_stats_sync tx_syncp; +struct virtnet_rx_stats { struct u64_stats_sync rx_syncp; - u64 tx_bytes; + u64 rx_packets; + u64 rx_bytes; +}; + +struct virtnet_tx_stats { + struct u64_stats_sync tx_syncp; u64 tx_packets; + u64 tx_bytes; +}; - u64 rx_bytes; - u64 rx_packets; +struct virtnet_ethtool_stats { + char desc[ETH_GSTRING_LEN]; + int type; + int size; + int offset; +}; + +enum {VIRTNET_STATS_TX, VIRTNET_STATS_RX}; + +#define VIRTNET_RX_STATS_INFO(_struct, _field) \ + {#_field, VIRTNET_STATS_RX, FIELD_SIZEOF(_struct, _field), \ + offsetof(_struct, _field)} + +#define VIRTNET_TX_STATS_INFO(_struct, _field) \ + {#_field, VIRTNET_STATS_TX, FIELD_SIZEOF(_struct, _field), \ + offsetof(_struct, _field)} + +static const struct virtnet_ethtool_stats virtnet_et_rx_stats[] = { + VIRTNET_RX_STATS_INFO(struct virtnet_rx_stats, rx_packets), + VIRTNET_RX_STATS_INFO(struct virtnet_rx_stats, rx_bytes) +}; +#define VIRTNET_RX_STATS_NUM (ARRAY_SIZE(virtnet_et_rx_stats)) + +static const struct virtnet_ethtool_stats virtnet_et_tx_stats[] = { + VIRTNET_TX_STATS_INFO(struct virtnet_tx_stats, tx_packets), + VIRTNET_TX_STATS_INFO(struct virtnet_tx_stats, tx_bytes) }; +#define VIRTNET_TX_STATS_NUM (ARRAY_SIZE(virtnet_et_tx_stats)) /* Internal representation of a send virtqueue */ struct send_queue { @@ -61,6 +92,9 @@ struct send_queue { /* Name of the send queue: output.$index */ char name[40]; + + /* Active send queue statistics */ + struct virtnet_tx_stats stats; }; /* Internal representation of a receive virtqueue */ @@ -81,6 +115,9 @@ struct receive_queue { /* Name of this receive queue: input.$index */ char name[40]; + + /* Active receive queue statistics */ + struct virtnet_rx_stats stats; }; struct virtnet_info { @@ -109,9 +146,6 @@ struct virtnet_info { /* enable config space updates */ bool config_enable; - /* Active statistics */ - struct virtnet_stats __percpu *stats; - /* Work struct for refilling if we run low on memory. */ struct delayed_work refill; @@ -330,7 +364,7 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) { struct virtnet_info *vi = rq->vq->vdev->priv; struct net_device *dev = vi->dev; - struct virtnet_stats *stats = this_cpu_ptr(vi->stats); + struct virtnet_rx_stats *stats = &rq->stats; struct sk_buff *skb; struct page *page; struct skb_vnet_hdr *hdr; @@ -650,8 +684,7 @@ static void free_old_xmit_skbs(struct send_queue *sq) { struct sk_buff *skb; unsigned int len; - struct virtnet_info *vi = sq->vq->vdev->priv; - struct virtnet_stats *stats = this_cpu_ptr(vi->stats); + struct virtnet_tx_stats *stats = &sq->stats; while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { pr_debug("Sent skb %p\n", skb); @@ -841,24 +874,25 @@ static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, struct rtnl_link_stats64 *tot) { struct virtnet_info *vi = netdev_priv(dev); - int cpu; + int i; unsigned int start; - for_each_possible_cpu(cpu) { - struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); + for (i = 0; i < vi->max_queue_pairs; i++) { + struct virtnet_tx_stats *tstats = &vi->sq[i].stats; + struct virtnet_rx_stats *rstats = &vi->rq[i].stats; u64 tpackets, tbytes, rpackets, rbytes; do { - start = u64_stats_fetch_begin_bh(&stats->tx_syncp); - tpackets = stats->tx_packets; - tbytes = stats->tx_bytes; - } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); + start = u64_stats_fetch_begin_bh(&tstats->tx_syncp); + tpackets = tstats->tx_packets; + tbytes = tstats->tx_bytes; + } while (u64_stats_fetch_retry_bh(&tstats->tx_syncp, start)); do { - start = u64_stats_fetch_begin_bh(&stats->rx_syncp); - rpackets = stats->rx_packets; - rbytes = stats->rx_bytes; - } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); + start = u64_stats_fetch_begin_bh(&rstats->rx_syncp); + rpackets = rstats->rx_packets; + rbytes = rstats->rx_bytes; + } while (u64_stats_fetch_retry_bh(&rstats->rx_syncp, start)); tot->rx_packets += rpackets; tot->tx_packets += tpackets; @@ -1177,12 +1211,83 @@ static void virtnet_get_channels(struct net_device *dev, channels->other_count = 0; } +static void virtnet_get_stat_strings(struct net_device *dev, + u32 stringset, + u8 *data) +{ + struct virtnet_info *vi = netdev_priv(dev); + int i, j; + + switch (stringset) { + case ETH_SS_STATS: + for (i = 0; i < vi->max_queue_pairs; i++) { + for (j = 0; j < VIRTNET_RX_STATS_NUM; j++) { + sprintf(data, "rxq%d: %s", i, + virtnet_et_rx_stats[j].desc); + data += ETH_GSTRING_LEN; + } + for (j = 0; j < VIRTNET_TX_STATS_NUM; j++) { + sprintf(data, "txq%d: %s", i, + virtnet_et_tx_stats[j].desc); + data += ETH_GSTRING_LEN; + } + } + break; + } +} + +static int virtnet_get_sset_count(struct net_device *dev, int stringset) +{ + struct virtnet_info *vi = netdev_priv(dev); + switch (stringset) { + case ETH_SS_STATS: + return vi->max_queue_pairs * + (VIRTNET_RX_STATS_NUM + VIRTNET_TX_STATS_NUM); + default: + return -EINVAL; + } +} + +static void virtnet_get_ethtool_stats(struct net_device *dev, + struct ethtool_stats *stats, + u64 *data) +{ + struct virtnet_info *vi = netdev_priv(dev); + unsigned int i, base; + unsigned int start; + + for (i = 0, base = 0; i < vi->max_queue_pairs; i++) { + struct virtnet_tx_stats *tstats = &vi->sq[i].stats; + struct virtnet_rx_stats *rstats = &vi->rq[i].stats; + + do { + start = u64_stats_fetch_begin_bh(&rstats->rx_syncp); + data[base] = rstats->rx_packets; + data[base+1] = rstats->rx_bytes; + } while (u64_stats_fetch_retry_bh(&rstats->rx_syncp, start)); + + base += VIRTNET_RX_STATS_NUM; + + do { + start = u64_stats_fetch_begin_bh(&tstats->tx_syncp); + data[base] = tstats->tx_packets; + data[base+1] = tstats->tx_bytes; + } while (u64_stats_fetch_retry_bh(&tstats->tx_syncp, start)); + + base += VIRTNET_TX_STATS_NUM; + } +} + + static const struct ethtool_ops virtnet_ethtool_ops = { .get_drvinfo = virtnet_get_drvinfo, .get_link = ethtool_op_get_link, .get_ringparam = virtnet_get_ringparam, .set_channels = virtnet_set_channels, .get_channels = virtnet_get_channels, + .get_strings = virtnet_get_stat_strings, + .get_sset_count = virtnet_get_sset_count, + .get_ethtool_stats = virtnet_get_ethtool_stats, }; #define MIN_MTU 68 @@ -1531,14 +1636,11 @@ static int virtnet_probe(struct virtio_device *vdev) vi->dev = dev; vi->vdev = vdev; vdev->priv = vi; - vi->stats = alloc_percpu(struct virtnet_stats); err = -ENOMEM; - if (vi->stats == NULL) - goto free; vi->vq_index = alloc_percpu(int); if (vi->vq_index == NULL) - goto free_stats; + goto free; mutex_init(&vi->config_lock); vi->config_enable = true; @@ -1616,8 +1718,6 @@ free_vqs: virtnet_del_vqs(vi); free_index: free_percpu(vi->vq_index); -free_stats: - free_percpu(vi->stats); free: free_netdev(dev); return err; @@ -1653,7 +1753,6 @@ static void virtnet_remove(struct virtio_device *vdev) flush_work(&vi->config_work); free_percpu(vi->vq_index); - free_percpu(vi->stats); free_netdev(vi->dev); } -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/