[ovs-dev] [PATCH v5] Detailed packet drop statistics per dpdk and vhostuser ports
Sriram Vatala
sriram.v at altencalsoftlabs.com
Mon Jul 22 10:01:53 UTC 2019
OVS may be unable to transmit packets for multiple reasons and
today there is a single counter to track packets dropped due to
any of those reasons. The most common reason is that a VM is
unable to read packets fast enough causing the vhostuser port
transmit queue on the OVS side to become full. This manifests
as a problem with VNFs not receiving all packets. Having a
separate drop counter to track packets dropped because the
transmit queue is full will clearly indicate that the problem
is on the VM side and not in OVS. Similarly maintaining separate
counters for all possible drops helps in indicating sensible
cause for packet drops.
This patch adds counters for custom stats to track packets dropped
at port level and these stats are displayed along with
other stats in "ovs-vsctl get interface <iface> statistics"
command. The detailed stats will be available for both dpdk and
vhostuser ports.
Signed-off-by: Sriram Vatala <sriram.v at altencalsoftlabs.com>
---
lib/netdev-dpdk.c | 132 +++++++++++++++------
utilities/bugtool/automake.mk | 3 +-
utilities/bugtool/ovs-bugtool-get-iface-stats | 25 ++++
.../bugtool/plugins/network-status/openvswitch.xml | 1 +
vswitchd/vswitch.xml | 24 ++++
5 files changed, 150 insertions(+), 35 deletions(-)
create mode 100755 utilities/bugtool/ovs-bugtool-get-iface-stats
diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index 4805783..5f1ff7a 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -138,11 +138,14 @@ BUILD_ASSERT_DECL((MAX_NB_MBUF / ROUND_DOWN_POW2(MAX_NB_MBUF / MIN_NB_MBUF))
#define XSTAT_RX_FRAGMENTED_ERRORS "rx_fragmented_errors"
#define XSTAT_RX_JABBER_ERRORS "rx_jabber_errors"
-/* Size of vHost custom stats. */
-#define VHOST_CUSTOM_STATS_SIZE 1
+static const char *custom_stats_names[] = {"tx_retries",
+ "tx_failure_drops",
+ "tx_mtu_exceeded_drops",
+ "tx_qos_drops",
+ "rx_qos_drops"};
+#define CUSTOM_STATS_SIZE 5
-/* Names of vHost custom stats. */
-#define VHOST_STAT_TX_RETRIES "tx_retries"
+enum {TX_RETRIES, TX_FAILURE_DROPS, TX_MTU_DROPS, TX_QOS_DROPS, RX_QOS_DROPS};
#define SOCKET0 0
@@ -447,8 +450,8 @@ struct netdev_dpdk {
PADDED_MEMBERS(CACHE_LINE_SIZE,
struct netdev_stats stats;
- /* Custom stat for retries when unable to transmit. */
- uint64_t tx_retries;
+ /* Custom device statisitcs */
+ struct netdev_custom_counter custom_stats[CUSTOM_STATS_SIZE];
/* Protects stats */
rte_spinlock_t stats_lock;
/* 4 pad bytes here. */
@@ -1153,6 +1156,7 @@ common_construct(struct netdev *netdev, dpdk_port_t port_no,
enum dpdk_dev_type type, int socket_id)
OVS_REQUIRES(dpdk_mutex)
{
+ int i;
struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
ovs_mutex_init(&dev->mutex);
@@ -1190,6 +1194,13 @@ common_construct(struct netdev *netdev, dpdk_port_t port_no,
/* Initialize the flow control to NULL */
memset(&dev->fc_conf, 0, sizeof dev->fc_conf);
+ /* Initialize the custom stats to zeros */
+ memset(dev->custom_stats, 0, sizeof dev->custom_stats);
+
+ for (i = 0; i < CUSTOM_STATS_SIZE; i++) {
+ ovs_strlcpy(dev->custom_stats[i].name,
+ custom_stats_names[i], NETDEV_CUSTOM_STATS_NAME_SIZE);
+ }
/* Initilize the hardware offload flags to 0 */
dev->hw_ol_features = 0;
@@ -1205,7 +1216,6 @@ common_construct(struct netdev *netdev, dpdk_port_t port_no,
dev->rte_xstats_ids = NULL;
dev->rte_xstats_ids_size = 0;
- dev->tx_retries = 0;
return 0;
}
@@ -2160,7 +2170,7 @@ netdev_dpdk_vhost_update_rx_size_counters(struct netdev_stats *stats,
}
static inline void
-netdev_dpdk_vhost_update_rx_counters(struct netdev_stats *stats,
+netdev_dpdk_vhost_update_rx_counters(struct netdev_dpdk *dev,
struct dp_packet **packets, int count,
int dropped)
{
@@ -2168,8 +2178,11 @@ netdev_dpdk_vhost_update_rx_counters(struct netdev_stats *stats,
unsigned int packet_size;
struct dp_packet *packet;
+ struct netdev_stats *stats = &dev->stats;
stats->rx_packets += count;
stats->rx_dropped += dropped;
+ dev->custom_stats[RX_QOS_DROPS].value += dropped;
+
for (i = 0; i < count; i++) {
packet = packets[i];
packet_size = dp_packet_size(packet);
@@ -2239,7 +2252,7 @@ netdev_dpdk_vhost_rxq_recv(struct netdev_rxq *rxq,
}
rte_spinlock_lock(&dev->stats_lock);
- netdev_dpdk_vhost_update_rx_counters(&dev->stats, batch->packets,
+ netdev_dpdk_vhost_update_rx_counters(dev, batch->packets,
nb_rx, dropped);
rte_spinlock_unlock(&dev->stats_lock);
@@ -2290,6 +2303,7 @@ netdev_dpdk_rxq_recv(struct netdev_rxq *rxq, struct dp_packet_batch *batch,
if (OVS_UNLIKELY(dropped)) {
rte_spinlock_lock(&dev->stats_lock);
dev->stats.rx_dropped += dropped;
+ dev->custom_stats[RX_QOS_DROPS].value += dropped;
rte_spinlock_unlock(&dev->stats_lock);
}
@@ -2349,19 +2363,27 @@ netdev_dpdk_filter_packet_len(struct netdev_dpdk *dev, struct rte_mbuf **pkts,
}
static inline void
-netdev_dpdk_vhost_update_tx_counters(struct netdev_stats *stats,
+netdev_dpdk_vhost_update_tx_counters(struct netdev_dpdk *dev,
struct dp_packet **packets,
int attempted,
- int dropped)
+ uint64_t *pkt_drops)
{
int i;
- int sent = attempted - dropped;
+ int dropped = 0;
+ int sent;
+ pkt_drops[RX_QOS_DROPS] = 0;
+
+ for (i =0; i < CUSTOM_STATS_SIZE; i++) {
+ dev->custom_stats[i].value += pkt_drops[i];
+ dropped += pkt_drops[i];
+ }
- stats->tx_packets += sent;
- stats->tx_dropped += dropped;
+ sent = attempted - dropped;
+ dev->stats.tx_packets += sent;
+ dev->stats.tx_dropped += dropped;
for (i = 0; i < sent; i++) {
- stats->tx_bytes += dp_packet_size(packets[i]);
+ dev->stats.tx_bytes += dp_packet_size(packets[i]);
}
}
@@ -2376,6 +2398,7 @@ __netdev_dpdk_vhost_send(struct netdev *netdev, int qid,
int i, retries = 0;
int max_retries = VHOST_ENQ_RETRY_MIN;
int vid = netdev_dpdk_get_vid(dev);
+ uint64_t pkt_drops[CUSTOM_STATS_SIZE];
qid = dev->tx_q[qid % netdev->n_txq].map;
@@ -2390,9 +2413,11 @@ __netdev_dpdk_vhost_send(struct netdev *netdev, int qid,
rte_spinlock_lock(&dev->tx_q[qid].tx_lock);
cnt = netdev_dpdk_filter_packet_len(dev, cur_pkts, cnt);
+ pkt_drops[TX_MTU_DROPS] = total_pkts - cnt;
+ pkt_drops[TX_QOS_DROPS] = cnt;
/* Check has QoS has been configured for the netdev */
cnt = netdev_dpdk_qos_run(dev, cur_pkts, cnt, true);
- dropped = total_pkts - cnt;
+ pkt_drops[TX_QOS_DROPS] -= cnt;
do {
int vhost_qid = qid * VIRTIO_QNUM + VIRTIO_RXQ;
@@ -2419,10 +2444,14 @@ __netdev_dpdk_vhost_send(struct netdev *netdev, int qid,
rte_spinlock_unlock(&dev->tx_q[qid].tx_lock);
+ pkt_drops[TX_FAILURE_DROPS] = cnt;
+ pkt_drops[TX_RETRIES] = MIN(retries, max_retries);
+
rte_spinlock_lock(&dev->stats_lock);
- netdev_dpdk_vhost_update_tx_counters(&dev->stats, pkts, total_pkts,
- cnt + dropped);
- dev->tx_retries += MIN(retries, max_retries);
+ dropped = dev->stats.tx_dropped;
+ netdev_dpdk_vhost_update_tx_counters(dev, pkts, total_pkts,
+ pkt_drops);
+ dropped = dev->stats.tx_dropped - dropped;
rte_spinlock_unlock(&dev->stats_lock);
out:
@@ -2447,12 +2476,15 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch)
struct rte_mbuf *pkts[PKT_ARRAY_SIZE];
uint32_t cnt = batch_cnt;
uint32_t dropped = 0;
+ uint32_t mtu_drops = 0;
+ uint32_t qos_drops = 0;
+ uint32_t tx_failed = 0;
if (dev->type != DPDK_DEV_VHOST) {
/* Check if QoS has been configured for this netdev. */
cnt = netdev_dpdk_qos_run(dev, (struct rte_mbuf **) batch->packets,
batch_cnt, false);
- dropped += batch_cnt - cnt;
+ qos_drops = batch_cnt - cnt;
}
uint32_t txcnt = 0;
@@ -2465,7 +2497,7 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch)
VLOG_WARN_RL(&rl, "Too big size %u max_packet_len %d",
size, dev->max_packet_len);
- dropped++;
+ mtu_drops++;
continue;
}
@@ -2488,13 +2520,17 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch)
__netdev_dpdk_vhost_send(netdev, qid, (struct dp_packet **) pkts,
txcnt);
} else {
- dropped += netdev_dpdk_eth_tx_burst(dev, qid, pkts, txcnt);
+ tx_failed = netdev_dpdk_eth_tx_burst(dev, qid, pkts, txcnt);
}
}
+ dropped += mtu_drops + qos_drops + tx_failed;
if (OVS_UNLIKELY(dropped)) {
rte_spinlock_lock(&dev->stats_lock);
dev->stats.tx_dropped += dropped;
+ dev->custom_stats[TX_MTU_DROPS].value += mtu_drops;
+ dev->custom_stats[TX_QOS_DROPS].value += qos_drops;
+ dev->custom_stats[TX_FAILURE_DROPS].value += tx_failed;
rte_spinlock_unlock(&dev->stats_lock);
}
}
@@ -2536,18 +2572,25 @@ netdev_dpdk_send__(struct netdev_dpdk *dev, int qid,
dp_packet_delete_batch(batch, true);
} else {
int tx_cnt, dropped;
+ int mtu_drops, tx_failed, qos_drops;
int batch_cnt = dp_packet_batch_size(batch);
struct rte_mbuf **pkts = (struct rte_mbuf **) batch->packets;
tx_cnt = netdev_dpdk_filter_packet_len(dev, pkts, batch_cnt);
+ mtu_drops = batch_cnt - tx_cnt;
+ qos_drops = tx_cnt;
tx_cnt = netdev_dpdk_qos_run(dev, pkts, tx_cnt, true);
- dropped = batch_cnt - tx_cnt;
+ qos_drops -= tx_cnt;
- dropped += netdev_dpdk_eth_tx_burst(dev, qid, pkts, tx_cnt);
+ tx_failed = netdev_dpdk_eth_tx_burst(dev, qid, pkts, tx_cnt);
+ dropped = mtu_drops + qos_drops + tx_failed;
if (OVS_UNLIKELY(dropped)) {
rte_spinlock_lock(&dev->stats_lock);
dev->stats.tx_dropped += dropped;
+ dev->custom_stats[TX_MTU_DROPS].value += mtu_drops;
+ dev->custom_stats[TX_QOS_DROPS].value += qos_drops;
+ dev->custom_stats[TX_FAILURE_DROPS].value += tx_failed;
rte_spinlock_unlock(&dev->stats_lock);
}
}
@@ -2796,6 +2839,7 @@ out:
rte_spinlock_lock(&dev->stats_lock);
stats->tx_dropped = dev->stats.tx_dropped;
stats->rx_dropped = dev->stats.rx_dropped;
+
rte_spinlock_unlock(&dev->stats_lock);
/* These are the available DPDK counters for packets not received due to
@@ -2818,6 +2862,10 @@ netdev_dpdk_get_custom_stats(const struct netdev *netdev,
int rte_xstats_ret;
ovs_mutex_lock(&dev->mutex);
+ uint16_t index = 0;
+
+ /* Excluding tx_retries stat which is for vhostuser ports */
+ custom_stats->size = CUSTOM_STATS_SIZE - 1;
if (netdev_dpdk_configure_xstats(dev)) {
uint64_t *values = xcalloc(dev->rte_xstats_ids_size,
@@ -2830,10 +2878,11 @@ netdev_dpdk_get_custom_stats(const struct netdev *netdev,
if (rte_xstats_ret > 0 &&
rte_xstats_ret <= dev->rte_xstats_ids_size) {
- custom_stats->size = rte_xstats_ret;
+ index = rte_xstats_ret;
+ custom_stats->size += rte_xstats_ret;
custom_stats->counters =
- (struct netdev_custom_counter *) xcalloc(rte_xstats_ret,
- sizeof(struct netdev_custom_counter));
+ (struct netdev_custom_counter *) xcalloc(custom_stats->size,
+ sizeof(struct netdev_custom_counter));
for (i = 0; i < rte_xstats_ret; i++) {
ovs_strlcpy(custom_stats->counters[i].name,
@@ -2846,7 +2895,6 @@ netdev_dpdk_get_custom_stats(const struct netdev *netdev,
VLOG_WARN("Cannot get XSTATS values for port: "DPDK_PORT_ID_FMT,
dev->port_id);
custom_stats->counters = NULL;
- custom_stats->size = 0;
/* Let's clear statistics cache, so it will be
* reconfigured */
netdev_dpdk_clear_xstats(dev);
@@ -2855,6 +2903,21 @@ netdev_dpdk_get_custom_stats(const struct netdev *netdev,
free(values);
}
+ if (custom_stats->counters == NULL) {
+ custom_stats->counters =
+ (struct netdev_custom_counter *) xcalloc(custom_stats->size,
+ sizeof(struct netdev_custom_counter));
+ }
+
+ rte_spinlock_lock(&dev->stats_lock);
+ /* Start from index 1 to exclude tx_retries stat for vhostuser ports */
+ for (i = 1; i < CUSTOM_STATS_SIZE; i++) {
+ custom_stats->counters[index].value = dev->custom_stats[i].value;
+ ovs_strlcpy(custom_stats->counters[index].name,
+ dev->custom_stats[i].name, NETDEV_CUSTOM_STATS_NAME_SIZE);
+ index++;
+ }
+ rte_spinlock_unlock(&dev->stats_lock);
ovs_mutex_unlock(&dev->mutex);
return 0;
@@ -2865,17 +2928,18 @@ netdev_dpdk_vhost_get_custom_stats(const struct netdev *netdev,
struct netdev_custom_stats *custom_stats)
{
struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
-
+ int i;
ovs_mutex_lock(&dev->mutex);
- custom_stats->size = VHOST_CUSTOM_STATS_SIZE;
+ custom_stats->size = CUSTOM_STATS_SIZE;
custom_stats->counters = xcalloc(custom_stats->size,
sizeof *custom_stats->counters);
- ovs_strlcpy(custom_stats->counters[0].name, VHOST_STAT_TX_RETRIES,
- NETDEV_CUSTOM_STATS_NAME_SIZE);
-
rte_spinlock_lock(&dev->stats_lock);
- custom_stats->counters[0].value = dev->tx_retries;
+ for (i = 0; i < CUSTOM_STATS_SIZE; i++) {
+ custom_stats->counters[i].value = dev->custom_stats[i].value;
+ ovs_strlcpy(custom_stats->counters[i].name,
+ dev->custom_stats[i].name, NETDEV_CUSTOM_STATS_NAME_SIZE);
+ }
rte_spinlock_unlock(&dev->stats_lock);
ovs_mutex_unlock(&dev->mutex);
diff --git a/utilities/bugtool/automake.mk b/utilities/bugtool/automake.mk
index 18fa347..9657468 100644
--- a/utilities/bugtool/automake.mk
+++ b/utilities/bugtool/automake.mk
@@ -22,7 +22,8 @@ bugtool_scripts = \
utilities/bugtool/ovs-bugtool-ovs-bridge-datapath-type \
utilities/bugtool/ovs-bugtool-ovs-vswitchd-threads-affinity \
utilities/bugtool/ovs-bugtool-qos-configs \
- utilities/bugtool/ovs-bugtool-get-dpdk-nic-numa
+ utilities/bugtool/ovs-bugtool-get-dpdk-nic-numa \
+ utilities/bugtool/ovs-bugtool-get-iface-stats
scripts_SCRIPTS += $(bugtool_scripts)
diff --git a/utilities/bugtool/ovs-bugtool-get-iface-stats b/utilities/bugtool/ovs-bugtool-get-iface-stats
new file mode 100755
index 0000000..0fe175e
--- /dev/null
+++ b/utilities/bugtool/ovs-bugtool-get-iface-stats
@@ -0,0 +1,25 @@
+#! /bin/bash
+
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of version 2.1 of the GNU Lesser General
+# Public License as published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+#
+# Copyright (C) 2019 Ericsson AB
+
+for bridge in `ovs-vsctl -- --real list-br`
+do
+ echo -e "\nBridge : ${bridge}\n"
+ for iface in `ovs-vsctl list-ifaces ${bridge}`
+ do
+ echo -e "iface : ${iface}"
+ ovs-vsctl get interface ${iface} statistics
+ echo -e "\n"
+ done
+ echo -e "iface : ${bridge}"
+ ovs-vsctl get interface ${bridge} statistics
+done
diff --git a/utilities/bugtool/plugins/network-status/openvswitch.xml b/utilities/bugtool/plugins/network-status/openvswitch.xml
index d39867c..f8c4ff0 100644
--- a/utilities/bugtool/plugins/network-status/openvswitch.xml
+++ b/utilities/bugtool/plugins/network-status/openvswitch.xml
@@ -34,6 +34,7 @@
<command label="ovs-appctl-dpctl-dump-flows-netdev" filters="ovs" repeat="2">ovs-appctl dpctl/dump-flows netdev at ovs-netdev</command>
<command label="ovs-appctl-dpctl-dump-flows-system" filters="ovs" repeat="2">ovs-appctl dpctl/dump-flows system at ovs-system</command>
<command label="ovs-appctl-dpctl-show-s" filters="ovs" repeat="2">ovs-appctl dpctl/show -s</command>
+ <command label="ovs-vsctl-get-interface-statistics" filters="ovs">/usr/share/openvswitch/scripts/ovs-bugtool-get-iface-stats</command>
<command label="ovs-ofctl-show" filters="ovs">/usr/share/openvswitch/scripts/ovs-bugtool-ovs-ofctl-loop-over-bridges "show"</command>
<command label="ovs-ofctl-dump-flows" filters="ovs" repeat="2">/usr/share/openvswitch/scripts/ovs-bugtool-ovs-ofctl-loop-over-bridges "dump-flows"</command>
<command label="ovs-ofctl-dump-ports" filters="ovs" repeat="2">/usr/share/openvswitch/scripts/ovs-bugtool-ovs-ofctl-loop-over-bridges "dump-ports"</command>
diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index 6d99f7c..82916d0 100644
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -3446,6 +3446,30 @@ ovs-vsctl add-port br0 p0 -- set Interface p0 type=patch options:peer=p1 \
the above.
</column>
</group>
+ <group title="Statistics: Custom stats">
+ <column name="statistics" key="tx_retries">
+ Total number of transmit retries on a vhost-user or vhost-user-client
+ interface.
+ </column>
+ <column name="statistics" key="tx_failure_drops">
+ Total number of packets dropped because DPDP transmit API for
+ physical/vhost ports fails to transmit the packets. This happens
+ most likely because the transmit queue is full or has been filled
+ up. There are other reasons as well which are unlikely to happen.
+ </column>
+ <column name="statistics" key="tx_mtu_exceeded_drops">
+ Number of packets dropped due to packet length exceeding the max
+ device MTU.
+ </column>
+ <column name="statistics" key="tx_qos_drops">
+ Total number of packets dropped due to transmission rate exceeding
+ the configured egress policer rate.
+ </column>
+ <column name="statistics" key="rx_qos_drops">
+ Total number of packets dropped due to reception rate exceeding
+ the configured ingress policer rate.
+ </column>
+ </group>
</group>
<group title="Ingress Policing">
--
2.7.4
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