提交 d7dfc5cf 编写于 作者: T Toshiaki Makita 提交者: David S. Miller

virtio_net: Add ethtool stats

The main purpose of this patch is adding a way of checking per-queue stats.
It's useful to debug performance problems on multiqueue environment.

$ ethtool -S ens10
NIC statistics:
     rx_queue_0_packets: 2090408
     rx_queue_0_bytes: 3164825094
     rx_queue_1_packets: 2082531
     rx_queue_1_bytes: 3152932314
     tx_queue_0_packets: 2770841
     tx_queue_0_bytes: 4194955474
     tx_queue_1_packets: 3084697
     tx_queue_1_bytes: 4670196372

This change converts existing per-cpu stats structure into per-queue one.
This should not impact on performance since each queue counter is not
updated concurrently by multiple cpus.

Performance numbers:
 - Guest has 2 vcpus and 2 queues
 - Guest runs netserver
 - Host runs 100-flow super_netperf

                     Before      After       Diff
UDP_STREAM 18byte        86.22       87.00   +0.90%
UDP_STREAM 1472byte    4055.27     4042.18   -0.32%
TCP_STREAM            16956.32    16890.63   -0.39%
UDP_RR               178667.11   185862.70   +4.03%
TCP_RR               128473.04   124985.81   -2.71%
Signed-off-by: NToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 d1b1110f
......@@ -66,16 +66,39 @@ static const unsigned long guest_offloads[] = {
VIRTIO_NET_F_GUEST_UFO
};
struct virtnet_stats {
struct u64_stats_sync tx_syncp;
struct u64_stats_sync rx_syncp;
u64 tx_bytes;
u64 tx_packets;
u64 rx_bytes;
u64 rx_packets;
struct virtnet_stat_desc {
char desc[ETH_GSTRING_LEN];
size_t offset;
};
struct virtnet_sq_stats {
struct u64_stats_sync syncp;
u64 packets;
u64 bytes;
};
struct virtnet_rq_stats {
struct u64_stats_sync syncp;
u64 packets;
u64 bytes;
};
#define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
#define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
{ "packets", VIRTNET_SQ_STAT(packets) },
{ "bytes", VIRTNET_SQ_STAT(bytes) },
};
static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
{ "packets", VIRTNET_RQ_STAT(packets) },
{ "bytes", VIRTNET_RQ_STAT(bytes) },
};
#define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
#define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
/* Internal representation of a send virtqueue */
struct send_queue {
/* Virtqueue associated with this send _queue */
......@@ -87,6 +110,8 @@ struct send_queue {
/* Name of the send queue: output.$index */
char name[40];
struct virtnet_sq_stats stats;
struct napi_struct napi;
};
......@@ -99,6 +124,8 @@ struct receive_queue {
struct bpf_prog __rcu *xdp_prog;
struct virtnet_rq_stats stats;
/* Chain pages by the private ptr. */
struct page *pages;
......@@ -152,9 +179,6 @@ struct virtnet_info {
/* Packet virtio header size */
u8 hdr_len;
/* Active statistics */
struct virtnet_stats __percpu *stats;
/* Work struct for refilling if we run low on memory. */
struct delayed_work refill;
......@@ -1127,7 +1151,6 @@ static int virtnet_receive(struct receive_queue *rq, int budget, bool *xdp_xmit)
struct virtnet_info *vi = rq->vq->vdev->priv;
unsigned int len, received = 0, bytes = 0;
void *buf;
struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
if (!vi->big_packets || vi->mergeable_rx_bufs) {
void *ctx;
......@@ -1150,10 +1173,10 @@ static int virtnet_receive(struct receive_queue *rq, int budget, bool *xdp_xmit)
schedule_delayed_work(&vi->refill, 0);
}
u64_stats_update_begin(&stats->rx_syncp);
stats->rx_bytes += bytes;
stats->rx_packets += received;
u64_stats_update_end(&stats->rx_syncp);
u64_stats_update_begin(&rq->stats.syncp);
rq->stats.bytes += bytes;
rq->stats.packets += received;
u64_stats_update_end(&rq->stats.syncp);
return received;
}
......@@ -1162,8 +1185,6 @@ 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);
unsigned int packets = 0;
unsigned int bytes = 0;
......@@ -1182,10 +1203,10 @@ static void free_old_xmit_skbs(struct send_queue *sq)
if (!packets)
return;
u64_stats_update_begin(&stats->tx_syncp);
stats->tx_bytes += bytes;
stats->tx_packets += packets;
u64_stats_update_end(&stats->tx_syncp);
u64_stats_update_begin(&sq->stats.syncp);
sq->stats.bytes += bytes;
sq->stats.packets += packets;
u64_stats_update_end(&sq->stats.syncp);
}
static void virtnet_poll_cleantx(struct receive_queue *rq)
......@@ -1474,24 +1495,25 @@ static void virtnet_stats(struct net_device *dev,
struct rtnl_link_stats64 *tot)
{
struct virtnet_info *vi = netdev_priv(dev);
int cpu;
unsigned int start;
int i;
for_each_possible_cpu(cpu) {
struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
for (i = 0; i < vi->max_queue_pairs; i++) {
u64 tpackets, tbytes, rpackets, rbytes;
struct receive_queue *rq = &vi->rq[i];
struct send_queue *sq = &vi->sq[i];
do {
start = u64_stats_fetch_begin_irq(&stats->tx_syncp);
tpackets = stats->tx_packets;
tbytes = stats->tx_bytes;
} while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start));
start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
tpackets = sq->stats.packets;
tbytes = sq->stats.bytes;
} while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
do {
start = u64_stats_fetch_begin_irq(&stats->rx_syncp);
rpackets = stats->rx_packets;
rbytes = stats->rx_bytes;
} while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start));
start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
rpackets = rq->stats.packets;
rbytes = rq->stats.bytes;
} while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
tot->rx_packets += rpackets;
tot->tx_packets += tpackets;
......@@ -1829,6 +1851,83 @@ static int virtnet_set_channels(struct net_device *dev,
return err;
}
static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
struct virtnet_info *vi = netdev_priv(dev);
char *p = (char *)data;
unsigned int i, j;
switch (stringset) {
case ETH_SS_STATS:
for (i = 0; i < vi->curr_queue_pairs; i++) {
for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s",
i, virtnet_rq_stats_desc[j].desc);
p += ETH_GSTRING_LEN;
}
}
for (i = 0; i < vi->curr_queue_pairs; i++) {
for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s",
i, virtnet_sq_stats_desc[j].desc);
p += ETH_GSTRING_LEN;
}
}
break;
}
}
static int virtnet_get_sset_count(struct net_device *dev, int sset)
{
struct virtnet_info *vi = netdev_priv(dev);
switch (sset) {
case ETH_SS_STATS:
return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
VIRTNET_SQ_STATS_LEN);
default:
return -EOPNOTSUPP;
}
}
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 idx = 0, start, i, j;
const u8 *stats_base;
size_t offset;
for (i = 0; i < vi->curr_queue_pairs; i++) {
struct receive_queue *rq = &vi->rq[i];
stats_base = (u8 *)&rq->stats;
do {
start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
offset = virtnet_rq_stats_desc[j].offset;
data[idx + j] = *(u64 *)(stats_base + offset);
}
} while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
idx += VIRTNET_RQ_STATS_LEN;
}
for (i = 0; i < vi->curr_queue_pairs; i++) {
struct send_queue *sq = &vi->sq[i];
stats_base = (u8 *)&sq->stats;
do {
start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
offset = virtnet_sq_stats_desc[j].offset;
data[idx + j] = *(u64 *)(stats_base + offset);
}
} while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
idx += VIRTNET_SQ_STATS_LEN;
}
}
static void virtnet_get_channels(struct net_device *dev,
struct ethtool_channels *channels)
{
......@@ -1928,6 +2027,9 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
.get_drvinfo = virtnet_get_drvinfo,
.get_link = ethtool_op_get_link,
.get_ringparam = virtnet_get_ringparam,
.get_strings = virtnet_get_strings,
.get_sset_count = virtnet_get_sset_count,
.get_ethtool_stats = virtnet_get_ethtool_stats,
.set_channels = virtnet_set_channels,
.get_channels = virtnet_get_channels,
.get_ts_info = ethtool_op_get_ts_info,
......@@ -2420,6 +2522,9 @@ static int virtnet_alloc_queues(struct virtnet_info *vi)
sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
u64_stats_init(&vi->rq[i].stats.syncp);
u64_stats_init(&vi->sq[i].stats.syncp);
}
return 0;
......@@ -2544,7 +2649,7 @@ static int virtnet_validate(struct virtio_device *vdev)
static int virtnet_probe(struct virtio_device *vdev)
{
int i, err;
int i, err = -ENOMEM;
struct net_device *dev;
struct virtnet_info *vi;
u16 max_queue_pairs;
......@@ -2621,17 +2726,6 @@ 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;
for_each_possible_cpu(i) {
struct virtnet_stats *virtnet_stats;
virtnet_stats = per_cpu_ptr(vi->stats, i);
u64_stats_init(&virtnet_stats->tx_syncp);
u64_stats_init(&virtnet_stats->rx_syncp);
}
INIT_WORK(&vi->config_work, virtnet_config_changed_work);
......@@ -2668,7 +2762,7 @@ static int virtnet_probe(struct virtio_device *vdev)
*/
dev_err(&vdev->dev, "device MTU appears to have changed "
"it is now %d < %d", mtu, dev->min_mtu);
goto free_stats;
goto free;
}
dev->mtu = mtu;
......@@ -2692,7 +2786,7 @@ static int virtnet_probe(struct virtio_device *vdev)
/* Allocate/initialize the rx/tx queues, and invoke find_vqs */
err = init_vqs(vi);
if (err)
goto free_stats;
goto free;
#ifdef CONFIG_SYSFS
if (vi->mergeable_rx_bufs)
......@@ -2747,8 +2841,6 @@ static int virtnet_probe(struct virtio_device *vdev)
cancel_delayed_work_sync(&vi->refill);
free_receive_page_frags(vi);
virtnet_del_vqs(vi);
free_stats:
free_percpu(vi->stats);
free:
free_netdev(dev);
return err;
......@@ -2781,7 +2873,6 @@ static void virtnet_remove(struct virtio_device *vdev)
remove_vq_common(vi);
free_percpu(vi->stats);
free_netdev(vi->dev);
}
......
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