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Message-Id: <20211125020155.6488-2-xiangxia.m.yue@gmail.com>
Date: Thu, 25 Nov 2021 10:01:55 +0800
From: xiangxia.m.yue@...il.com
To: netdev@...r.kernel.org
Cc: Tonghao Zhang <xiangxia.m.yue@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH net-next 2/2] ifb: support ethtools stats
From: Tonghao Zhang <xiangxia.m.yue@...il.com>
With this feature, we can use the ethtools to get tx/rx
queues stats. This patch, introduce the ifb_update_q_stats
helper to update the queues stats, and ifb_q_stats to simplify
the codes.
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
---
drivers/net/ifb.c | 146 +++++++++++++++++++++++++++++++++++++---------
1 file changed, 120 insertions(+), 26 deletions(-)
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index d9078ce041c4..e5b0eeadca20 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -40,30 +40,54 @@
#define DRV_VERSION "1.0"
#define TX_Q_LIMIT 32
+struct ifb_q_stats {
+ u64 packets;
+ u64 bytes;
+ struct u64_stats_sync sync;
+};
+
struct ifb_q_private {
struct net_device *dev;
struct tasklet_struct ifb_tasklet;
int tasklet_pending;
int txqnum;
struct sk_buff_head rq;
- u64 rx_packets;
- u64 rx_bytes;
- struct u64_stats_sync rsync;
-
- struct u64_stats_sync tsync;
- u64 tx_packets;
- u64 tx_bytes;
struct sk_buff_head tq;
+ struct ifb_q_stats rx_stats;
+ struct ifb_q_stats tx_stats;
} ____cacheline_aligned_in_smp;
struct ifb_dev_private {
struct ifb_q_private *tx_private;
};
+/* For ethtools. */
+struct ifb_q_stats_desc {
+ char desc[ETH_GSTRING_LEN];
+ size_t offset;
+};
+
+#define IFB_Q_STAT(m) offsetof(struct ifb_q_stats, m)
+
+static const struct ifb_q_stats_desc ifb_q_stats_desc[] = {
+ { "packets", IFB_Q_STAT(packets) },
+ { "bytes", IFB_Q_STAT(bytes) },
+};
+
+#define IFB_Q_STATS_LEN ARRAY_SIZE(ifb_q_stats_desc)
+
static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev);
static int ifb_open(struct net_device *dev);
static int ifb_close(struct net_device *dev);
+static inline void ifb_update_q_stats(struct ifb_q_stats *stats, int len)
+{
+ u64_stats_update_begin(&stats->sync);
+ stats->packets++;
+ stats->bytes += len;
+ u64_stats_update_end(&stats->sync);
+}
+
static void ifb_ri_tasklet(struct tasklet_struct *t)
{
struct ifb_q_private *txp = from_tasklet(txp, t, ifb_tasklet);
@@ -87,10 +111,7 @@ static void ifb_ri_tasklet(struct tasklet_struct *t)
#endif
nf_skip_egress(skb, true);
- u64_stats_update_begin(&txp->tsync);
- txp->tx_packets++;
- txp->tx_bytes += skb->len;
- u64_stats_update_end(&txp->tsync);
+ ifb_update_q_stats(&txp->tx_stats, skb->len);
rcu_read_lock();
skb->dev = dev_get_by_index_rcu(dev_net(txp->dev), skb->skb_iif);
@@ -143,18 +164,18 @@ static void ifb_stats64(struct net_device *dev,
for (i = 0; i < dev->num_tx_queues; i++,txp++) {
do {
- start = u64_stats_fetch_begin_irq(&txp->rsync);
- packets = txp->rx_packets;
- bytes = txp->rx_bytes;
- } while (u64_stats_fetch_retry_irq(&txp->rsync, start));
+ start = u64_stats_fetch_begin_irq(&txp->rx_stats.sync);
+ packets = txp->rx_stats.packets;
+ bytes = txp->rx_stats.bytes;
+ } while (u64_stats_fetch_retry_irq(&txp->rx_stats.sync, start));
stats->rx_packets += packets;
stats->rx_bytes += bytes;
do {
- start = u64_stats_fetch_begin_irq(&txp->tsync);
- packets = txp->tx_packets;
- bytes = txp->tx_bytes;
- } while (u64_stats_fetch_retry_irq(&txp->tsync, start));
+ start = u64_stats_fetch_begin_irq(&txp->tx_stats.sync);
+ packets = txp->tx_stats.packets;
+ bytes = txp->tx_stats.bytes;
+ } while (u64_stats_fetch_retry_irq(&txp->tx_stats.sync, start));
stats->tx_packets += packets;
stats->tx_bytes += bytes;
}
@@ -177,8 +198,8 @@ static int ifb_dev_init(struct net_device *dev)
txp->dev = dev;
__skb_queue_head_init(&txp->rq);
__skb_queue_head_init(&txp->tq);
- u64_stats_init(&txp->rsync);
- u64_stats_init(&txp->tsync);
+ u64_stats_init(&txp->rx_stats.sync);
+ u64_stats_init(&txp->tx_stats.sync);
tasklet_setup(&txp->ifb_tasklet, ifb_ri_tasklet);
netif_tx_start_queue(netdev_get_tx_queue(dev, i));
}
@@ -191,6 +212,79 @@ static void ifb_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
}
+static void ifb_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
+{
+ u8 *p = buf;
+ int i, j;
+
+ switch(stringset) {
+ case ETH_SS_STATS:
+ for (i = 0; i < dev->real_num_rx_queues; i++) {
+ for (j = 0; j < IFB_Q_STATS_LEN; j++)
+ ethtool_sprintf(&p, "rx_queue_%u_%.18s",
+ i, ifb_q_stats_desc[j].desc);
+ }
+
+ for (i = 0; i < dev->real_num_tx_queues; i++) {
+ for (j = 0; j < IFB_Q_STATS_LEN; j++)
+ ethtool_sprintf(&p, "tx_queue_%u_%.18s",
+ i, ifb_q_stats_desc[j].desc);
+ }
+ break;
+ }
+}
+
+static int ifb_get_sset_count(struct net_device *dev, int sset)
+{
+ switch (sset) {
+ case ETH_SS_STATS:
+ return IFB_Q_STATS_LEN * (dev->real_num_rx_queues +
+ dev->real_num_tx_queues);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static void ifb_get_ethtool_stats(struct net_device *dev,
+ struct ethtool_stats *stats, u64 *data)
+{
+ struct ifb_dev_private *dp = netdev_priv(dev);
+ unsigned int start;
+ size_t offset;
+ int idx = 0;
+ int i, j;
+
+ for (i = 0; i < dev->real_num_rx_queues; i++) {
+ struct ifb_q_private *txp = dp->tx_private + i;
+ struct ifb_q_stats *rq_stats = &txp->rx_stats;
+ void *stats_base = (void *)&txp->rx_stats;;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&rq_stats->sync);
+ for (j = 0; j < IFB_Q_STATS_LEN; j++) {
+ offset = ifb_q_stats_desc[j].offset;
+ data[idx + j] = *(u64 *)(stats_base + offset);
+ }
+ } while (u64_stats_fetch_retry_irq(&rq_stats->sync, start));
+ idx += IFB_Q_STATS_LEN;
+ }
+
+ for (i = 0; i < dev->real_num_tx_queues; i++) {
+ struct ifb_q_private *txp = dp->tx_private + i;
+ struct ifb_q_stats *tq_stats = &txp->tx_stats;
+ void *stats_base = (void *)&txp->tx_stats;;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&tq_stats->sync);
+ for (j = 0; j < IFB_Q_STATS_LEN; j++) {
+ offset = ifb_q_stats_desc[j].offset;
+ data[idx + j] = *(u64 *)(stats_base + offset);
+ }
+ } while (u64_stats_fetch_retry_irq(&tq_stats->sync, start));
+ idx += IFB_Q_STATS_LEN;
+ }
+}
+
static const struct net_device_ops ifb_netdev_ops = {
.ndo_open = ifb_open,
.ndo_stop = ifb_close,
@@ -201,7 +295,10 @@ static const struct net_device_ops ifb_netdev_ops = {
};
static const struct ethtool_ops ifb_ethtool_ops = {
- .get_drvinfo = ifb_get_drvinfo,
+ .get_drvinfo = ifb_get_drvinfo,
+ .get_strings = ifb_get_strings,
+ .get_sset_count = ifb_get_sset_count,
+ .get_ethtool_stats = ifb_get_ethtool_stats,
};
#define IFB_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST | \
@@ -257,10 +354,7 @@ static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)
struct ifb_dev_private *dp = netdev_priv(dev);
struct ifb_q_private *txp = dp->tx_private + skb_get_queue_mapping(skb);
- u64_stats_update_begin(&txp->rsync);
- txp->rx_packets++;
- txp->rx_bytes += skb->len;
- u64_stats_update_end(&txp->rsync);
+ ifb_update_q_stats(&txp->rx_stats, skb->len);
if (!skb->redirected || !skb->skb_iif) {
dev_kfree_skb(skb);
--
2.27.0
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