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Message-Id: <4d4f1772e71ba7ad67e416646f5d9357caf60a42.1585163874.git.lorenzo@kernel.org>
Date: Wed, 25 Mar 2020 20:22:06 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, toshiaki.makita1@...il.com, brouer@...hat.com,
dsahern@...il.com, lorenzo.bianconi@...hat.com, toke@...hat.com
Subject: [PATCH net-next 2/2] veth: rely on peer veth_rq for ndo_xdp_xmit accounting
Rely on 'remote' veth_rq to account ndo_xdp_xmit ethtool counters.
Move XDP_TX accounting to veth_xdp_flush_bq routine.
Remove 'rx' prefix in rx xdp ethool counters
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
drivers/net/veth.c | 113 +++++++++++++++++++++++++++++----------------
1 file changed, 74 insertions(+), 39 deletions(-)
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 2041152da716..1b95ed0c6d67 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -92,17 +92,22 @@ struct veth_q_stat_desc {
static const struct veth_q_stat_desc veth_rq_stats_desc[] = {
{ "xdp_packets", VETH_RQ_STAT(xdp_packets) },
{ "xdp_bytes", VETH_RQ_STAT(xdp_bytes) },
- { "rx_drops", VETH_RQ_STAT(rx_drops) },
- { "rx_xdp_redirect", VETH_RQ_STAT(xdp_redirect) },
- { "rx_xdp_drops", VETH_RQ_STAT(xdp_drops) },
- { "rx_xdp_tx", VETH_RQ_STAT(xdp_tx) },
- { "rx_xdp_tx_errors", VETH_RQ_STAT(xdp_tx_err) },
- { "tx_xdp_xmit", VETH_RQ_STAT(xdp_xmit) },
- { "tx_xdp_xmit_errors", VETH_RQ_STAT(xdp_xmit_err) },
+ { "drops", VETH_RQ_STAT(rx_drops) },
+ { "xdp_redirect", VETH_RQ_STAT(xdp_redirect) },
+ { "xdp_drops", VETH_RQ_STAT(xdp_drops) },
+ { "xdp_tx", VETH_RQ_STAT(xdp_tx) },
+ { "xdp_tx_errors", VETH_RQ_STAT(xdp_tx_err) },
};
#define VETH_RQ_STATS_LEN ARRAY_SIZE(veth_rq_stats_desc)
+static const struct veth_q_stat_desc veth_tq_stats_desc[] = {
+ { "xdp_xmit", VETH_RQ_STAT(xdp_xmit) },
+ { "xdp_xmit_errors", VETH_RQ_STAT(xdp_xmit_err) },
+};
+
+#define VETH_TQ_STATS_LEN ARRAY_SIZE(veth_tq_stats_desc)
+
static struct {
const char string[ETH_GSTRING_LEN];
} ethtool_stats_keys[] = {
@@ -142,6 +147,14 @@ static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
p += ETH_GSTRING_LEN;
}
}
+ for (i = 0; i < dev->real_num_tx_queues; i++) {
+ for (j = 0; j < VETH_TQ_STATS_LEN; j++) {
+ snprintf(p, ETH_GSTRING_LEN,
+ "tx_queue_%u_%.18s",
+ i, veth_tq_stats_desc[j].desc);
+ p += ETH_GSTRING_LEN;
+ }
+ }
break;
}
}
@@ -151,7 +164,8 @@ static int veth_get_sset_count(struct net_device *dev, int sset)
switch (sset) {
case ETH_SS_STATS:
return ARRAY_SIZE(ethtool_stats_keys) +
- VETH_RQ_STATS_LEN * dev->real_num_rx_queues;
+ VETH_RQ_STATS_LEN * dev->real_num_rx_queues +
+ VETH_TQ_STATS_LEN * dev->real_num_tx_queues;
default:
return -EOPNOTSUPP;
}
@@ -160,7 +174,7 @@ static int veth_get_sset_count(struct net_device *dev, int sset)
static void veth_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
{
- struct veth_priv *priv = netdev_priv(dev);
+ struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
struct net_device *peer = rtnl_dereference(priv->peer);
int i, j, idx;
@@ -181,6 +195,26 @@ static void veth_get_ethtool_stats(struct net_device *dev,
} while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start));
idx += VETH_RQ_STATS_LEN;
}
+
+ if (!peer)
+ return;
+
+ rcv_priv = netdev_priv(peer);
+ for (i = 0; i < peer->real_num_rx_queues; i++) {
+ const struct veth_rq_stats *rq_stats = &rcv_priv->rq[i].stats;
+ const void *base = (void *)&rq_stats->vs;
+ unsigned int start, tx_idx = idx;
+ size_t offset;
+
+ tx_idx += (i % dev->real_num_tx_queues) * VETH_TQ_STATS_LEN;
+ do {
+ start = u64_stats_fetch_begin_irq(&rq_stats->syncp);
+ for (j = 0; j < VETH_TQ_STATS_LEN; j++) {
+ offset = veth_tq_stats_desc[j].offset;
+ data[tx_idx + j] += *(u64 *)(base + offset);
+ }
+ } while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start));
+ }
}
static const struct ethtool_ops veth_ethtool_ops = {
@@ -340,8 +374,8 @@ static void veth_get_stats64(struct net_device *dev,
tot->tx_packets = packets;
veth_stats_rx(&rx, dev);
- tot->tx_dropped += rx.xdp_xmit_err + rx.xdp_tx_err;
- tot->rx_dropped = rx.rx_drops;
+ tot->tx_dropped += rx.xdp_tx_err;
+ tot->rx_dropped = rx.rx_drops + rx.xdp_xmit_err;
tot->rx_bytes = rx.xdp_bytes;
tot->rx_packets = rx.xdp_packets;
@@ -353,7 +387,8 @@ static void veth_get_stats64(struct net_device *dev,
tot->rx_packets += packets;
veth_stats_rx(&rx, peer);
- tot->rx_dropped += rx.xdp_xmit_err + rx.xdp_tx_err;
+ tot->tx_dropped += rx.xdp_xmit_err;
+ tot->rx_dropped += rx.xdp_tx_err;
tot->tx_bytes += rx.xdp_bytes;
tot->tx_packets += rx.xdp_packets;
}
@@ -394,38 +429,28 @@ static int veth_xdp_xmit(struct net_device *dev, int n,
u32 flags, bool ndo_xmit)
{
struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
- unsigned int qidx, max_len;
+ int i, ret = -ENXIO, drops = 0;
struct net_device *rcv;
- int i, ret, drops = n;
+ unsigned int max_len;
struct veth_rq *rq;
- rcu_read_lock();
- if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
- rcu_read_unlock();
- atomic64_add(drops, &priv->dropped);
+ if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
return -EINVAL;
- }
+ rcu_read_lock();
rcv = rcu_dereference(priv->peer);
- if (unlikely(!rcv)) {
- rcu_read_unlock();
- atomic64_add(drops, &priv->dropped);
- return -ENXIO;
- }
+ if (unlikely(!rcv))
+ goto out;
rcv_priv = netdev_priv(rcv);
- qidx = veth_select_rxq(rcv);
- rq = &rcv_priv->rq[qidx];
+ rq = &rcv_priv->rq[veth_select_rxq(rcv)];
/* Non-NULL xdp_prog ensures that xdp_ring is initialized on receive
* side. This means an XDP program is loaded on the peer and the peer
* device is up.
*/
- if (!rcu_access_pointer(rq->xdp_prog)) {
- ret = -ENXIO;
- goto drop;
- }
+ if (!rcu_access_pointer(rq->xdp_prog))
+ goto out;
- drops = 0;
max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN;
spin_lock(&rq->xdp_ring.producer_lock);
@@ -445,18 +470,14 @@ static int veth_xdp_xmit(struct net_device *dev, int n,
__veth_xdp_flush(rq);
ret = n - drops;
-drop:
- rq = &priv->rq[qidx];
- u64_stats_update_begin(&rq->stats.syncp);
if (ndo_xmit) {
+ u64_stats_update_begin(&rq->stats.syncp);
rq->stats.vs.xdp_xmit += n - drops;
rq->stats.vs.xdp_xmit_err += drops;
- } else {
- rq->stats.vs.xdp_tx += n - drops;
- rq->stats.vs.xdp_tx_err += drops;
+ u64_stats_update_end(&rq->stats.syncp);
}
- u64_stats_update_end(&rq->stats.syncp);
+out:
rcu_read_unlock();
return ret;
@@ -465,7 +486,16 @@ static int veth_xdp_xmit(struct net_device *dev, int n,
static int veth_ndo_xdp_xmit(struct net_device *dev, int n,
struct xdp_frame **frames, u32 flags)
{
- return veth_xdp_xmit(dev, n, frames, flags, true);
+ int err;
+
+ err = veth_xdp_xmit(dev, n, frames, flags, true);
+ if (err < 0) {
+ struct veth_priv *priv = netdev_priv(dev);
+
+ atomic64_add(n, &priv->dropped);
+ }
+
+ return err;
}
static void veth_xdp_flush_bq(struct veth_rq *rq, struct veth_xdp_tx_bq *bq)
@@ -481,6 +511,11 @@ static void veth_xdp_flush_bq(struct veth_rq *rq, struct veth_xdp_tx_bq *bq)
}
trace_xdp_bulk_tx(rq->dev, sent, bq->count - sent, err);
+ u64_stats_update_begin(&rq->stats.syncp);
+ rq->stats.vs.xdp_tx += sent;
+ rq->stats.vs.xdp_tx_err += bq->count - sent;
+ u64_stats_update_end(&rq->stats.syncp);
+
bq->count = 0;
}
--
2.25.1
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