[ovs-dev] [PATCH v2] netdev_dpdk.c: Add QoS functionality.

Stokes, Ian ian.stokes at intel.com
Thu Oct 22 09:29:37 UTC 2015


Hi All,

Just wondering if anyone has input on v2 of the netdev-dpdk QoS patch?
Any feedback would be much appreciated.

Thanks
Ian

> -----Original Message-----
> From: Stokes, Ian
> Sent: Friday, October 16, 2015 2:28 PM
> To: dev at openvswitch.org
> Cc: Stokes, Ian
> Subject: [PATCH v2] netdev_dpdk.c: Add QoS functionality.
> 
> This patch provides the modifications required in netdev-dpdk.c and
> vswitch.xml to allow for a DPDK user space QoS algorithm.
> 
> This patch adds a QoS configuration structure for netdev-dpdk and
> expected QoS operations 'dpdk_qos_ops'. Various helper functions are
> also supplied.
> 
> Also included are the modifications required for vswitch.xml to allow a
> new QoS implementation for netdev-dpdk devices. This includes a new QoS
> type `egress-policer` as well as its expected QoS table entries.
> 
> The QoS functionality implemented for DPDK devices is `egress-policer`.
> This can be used to drop egress packets at a configurable rate.
> 
> The INSTALL.DPDK.md guide has also been modified to provide an example
> configuration of `egress-policer` QoS.
> 
> Signed-off-by: Ian Stokes <ian.stokes at intel.com>
> ---
>  INSTALL.DPDK.md      |   20 +++
>  lib/netdev-dpdk.c    |  416
> +++++++++++++++++++++++++++++++++++++++++++++++++-
>  vswitchd/vswitch.xml |   52 +++++++
>  3 files changed, 481 insertions(+), 7 deletions(-)
> 
> diff --git a/INSTALL.DPDK.md b/INSTALL.DPDK.md index 7bf110c..c64b8ce
> 100644
> --- a/INSTALL.DPDK.md
> +++ b/INSTALL.DPDK.md
> @@ -207,6 +207,26 @@ Using the DPDK with ovs-vswitchd:
>     ./ovs-ofctl add-flow br0 in_port=2,action=output:1
>     ```
> 
> +8. QoS usage example
> +
> +   Assuming you have a vhost-user port transmitting traffic consisting
> of
> +   packets of size 64 bytes, the following command would limit the
> egress
> +   transmission rate of the port to ~1,000,000 packets per second:
> +
> +   `ovs-vsctl set port vhost-user0 qos=@newqos -- --id=@newqos create
> qos
> +   type=egress-policer other-config:cir=46000000 other-config:cbs=2048`
> +
> +   To examine the QoS configuration of the port:
> +
> +   `ovs-appctl -t ovs-vswitchd qos/show vhost-user0`
> +
> +   To clear the QoS configuration from the port and ovsdb use the
> following:
> +
> +   `ovs-vsctl -- destroy QoS vhost-user0 -- clear Port vhost-user0 qos`
> +
> +   For more details regarding egress-policer parameters please refer to
> the
> +   vswitch.xml.
> +
>  Performance Tuning:
>  -------------------
> 
> diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c index
> 93b0589..cd4c532 100644
> --- a/lib/netdev-dpdk.c
> +++ b/lib/netdev-dpdk.c
> @@ -44,6 +44,7 @@
>  #include "ovs-rcu.h"
>  #include "packets.h"
>  #include "shash.h"
> +#include "smap.h"
>  #include "sset.h"
>  #include "unaligned.h"
>  #include "timeval.h"
> @@ -52,12 +53,14 @@
> 
>  #include "rte_config.h"
>  #include "rte_mbuf.h"
> +#include "rte_meter.h"
>  #include "rte_virtio_net.h"
> 
>  VLOG_DEFINE_THIS_MODULE(dpdk);
>  static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
> 
>  #define DPDK_PORT_WATCHDOG_INTERVAL 5
> +#define DPDK_MAX_QOS_NAME_SIZE 10
> 
>  #define OVS_CACHE_LINE_SIZE CACHE_LINE_SIZE  #define OVS_VPORT_DPDK
> "ovs_dpdk"
> @@ -142,6 +145,107 @@ static int rte_eal_init_ret = ENODEV;
> 
>  static struct ovs_mutex dpdk_mutex = OVS_MUTEX_INITIALIZER;
> 
> +/* Quality of Service */
> +
> +/* An instance of a QoS configuration.  Always associated with a
> +particular
> + * network device.
> + *
> + * Each QoS implementation subclasses this with whatever additional
> +data it
> + * needs.
> + */
> +struct qos_conf {
> +    const struct dpdk_qos_ops *ops;
> +};
> +
> +/* A particular implementation of dpdk QoS operations.
> + *
> + * The functions below return 0 if successful or a positive errno value
> +on
> + * failure, except where otherwise noted. All of them must be provided,
> +except
> + * where otherwise noted.
> + */
> +struct dpdk_qos_ops {
> +
> +    /* Name of the QoS type */
> +    const char *qos_name;
> +
> +    /* Called to construct the QoS implementation on 'netdev'. The
> +     * implementation should make the appropriate calls to configure
> QoS
> +     * according to 'details'. The implementation may assume that any
> current
> +     * QoS configuration already installed should be destroyed before
> +     * constructing the new configuration.
> +     *
> +     * The contents of 'details' should be documented as valid for
> 'ovs_name'
> +     * in the "other_config" column in the "QoS" table in
> vswitchd/vswitch.xml
> +     * (which is built as ovs-vswitchd.conf.db(8)).
> +     *
> +     * This function must return 0 if and only if it sets 'netdev-
> >qos_conf'
> +     * to an initialized 'struct qos_conf'.
> +     *
> +     * For all QoS implementations it should always be non-null.
> +     */
> +    int (*qos_construct)(struct netdev *netdev, const struct smap
> + *details);
> +
> +    /* Destroys the data structures allocated by the implementation as
> part of
> +     * 'qos_conf.
> +     *
> +     * For all QoS implementations it should always be non-null.
> +     */
> +    void (*qos_destruct)(struct netdev *netdev, struct qos_conf *conf);
> +
> +    /* Retrieves details of 'netdev->qos_conf' configuration into
> 'details'.
> +     *
> +     * The contents of 'details' should be documented as valid for
> 'ovs_name'
> +     * in the "other_config" column in the "QoS" table in
> vswitchd/vswitch.xml
> +     * (which is built as ovs-vswitchd.conf.db(8)).
> +     */
> +    int (*qos_get)(const struct netdev *netdev, struct smap *details);
> +
> +    /* Reconfigures 'netdev->qos_conf' according to 'details',
> performing any
> +     * required calls to complete the reconfiguration.
> +     *
> +     * The contents of 'details' should be documented as valid for
> 'ovs_name'
> +     * in the "other_config" column in the "QoS" table in
> vswitchd/vswitch.xml
> +     * (which is built as ovs-vswitchd.conf.db(8)).
> +     *
> +     * This function may be null if 'qos_conf' is not configurable.
> +     */
> +    int (*qos_set)(struct netdev *netdev, const struct smap *details);
> +
> +    /* Modify an array of rte_mbufs. The modification is specific to
> +     * each qos implementation.
> +     *
> +     * The function should take and array of mbufs and an int
> representing
> +     * the current number of mbufs present in the array.
> +     *
> +     * After the function has performed a qos modification to the array
> of
> +     * mbufs it returns an int representing the number of mbufs now
> present in
> +     * the array. This value is can then be passed to the port send
> function
> +     * along with the modified array for transmission.
> +     *
> +     * For all QoS implementations it should always be non-null.
> +     */
> +    int (*qos_alg_process)(struct netdev *netdev, struct rte_mbuf
> **pkts,
> +                           int pkt_cnt); };
> +
> +/* dpdk_qos_ops for each type of user space QoS implementation */
> +static const struct dpdk_qos_ops egress_policer_ops;
> +
> +/*
> + * Array of dpdk_qos_ops, contains pointer to all supported QoS
> + * operations.
> + */
> +static const struct dpdk_qos_ops *const qos_confs[] = {
> +    &egress_policer_ops,
> +    NULL
> +};
> +
> +/* Action that can be set for a packet for rte_meter */ enum
> +egress_policer_action {
> +        GREEN = e_RTE_METER_GREEN,
> +        DROP = 1,
> +};
> +
>  /* Contains all 'struct dpdk_dev's. */
>  static struct ovs_list dpdk_list OVS_GUARDED_BY(dpdk_mutex)
>      = OVS_LIST_INITIALIZER(&dpdk_list); @@ -235,6 +339,11 @@ struct
> netdev_dpdk {
> 
>      /* In dpdk_list. */
>      struct ovs_list list_node OVS_GUARDED_BY(dpdk_mutex);
> +
> +    /* QoS configuration and lock for the device */
> +    struct qos_conf *qos_conf;
> +    rte_spinlock_t qos_lock;
> +
>  };
> 
>  struct netdev_rxq_dpdk {
> @@ -614,6 +723,10 @@ netdev_dpdk_init(struct netdev *netdev_, unsigned
> int port_no,
>          goto unlock;
>      }
> 
> +    /* Initialise QoS configuration to NULL and qos lock to unlocked */
> +    netdev->qos_conf = NULL;
> +    rte_spinlock_init(&netdev->qos_lock);
> +
>      netdev_->n_txq = NR_QUEUE;
>      netdev_->n_rxq = NR_QUEUE;
>      netdev->real_n_txq = NR_QUEUE;
> @@ -1038,6 +1151,21 @@ netdev_dpdk_rxq_recv(struct netdev_rxq *rxq_,
> struct dp_packet **packets,
>      return 0;
>  }
> 
> +static inline int
> +netdev_dpdk_qos_process__(struct netdev_dpdk *dev, struct rte_mbuf
> **pkts,
> +                        int cnt)
> +{
> +    struct netdev *netdev = &dev->up;
> +
> +    rte_spinlock_lock(&dev->qos_lock);
> +    if (dev->qos_conf != NULL) {
> +        cnt = dev->qos_conf->ops->qos_alg_process(netdev, pkts, cnt);
> +    }
> +    rte_spinlock_unlock(&dev->qos_lock);
> +
> +    return cnt;
> +}
> +
>  static inline void
>  netdev_dpdk_vhost_update_tx_counters(struct netdev_stats *stats,
>                                       struct dp_packet **packets, @@ -
> 1072,6 +1200,9 @@ __netdev_dpdk_vhost_send(struct netdev *netdev, struct
> dp_packet **pkts,
>          goto out;
>      }
> 
> +    /* Check has QoS has been configured for the netdev */
> +    cnt = netdev_dpdk_qos_process__(vhost_dev, cur_pkts, cnt);
> +
>      /* There is vHost TX single queue, So we need to lock it for TX. */
>      rte_spinlock_lock(&vhost_dev->vhost_tx_lock);
> 
> @@ -1216,6 +1347,10 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid,
> struct dp_packet **pkts,
>      if (dev->type == DPDK_DEV_VHOST) {
>          __netdev_dpdk_vhost_send(netdev, (struct dp_packet **) mbufs,
> newcnt, true);
>      } else {
> +
> +        /* Check if QoS has been configured for this netdev. */
> +        newcnt = netdev_dpdk_qos_process__(dev, mbufs, newcnt);
> +
>          dpdk_queue_pkts(dev, qid, mbufs, newcnt);
>          dpdk_queue_flush(dev, qid);
>      }
> @@ -1275,9 +1410,15 @@ netdev_dpdk_send__(struct netdev_dpdk *dev, int
> qid,
> 
>              if (OVS_UNLIKELY(size > dev->max_packet_len)) {
>                  if (next_tx_idx != i) {
> +                    cnt = i - next_tx_idx;
> +
> +                    cnt = netdev_dpdk_qos_process__(dev,
> +                                                    (struct
> rte_mbuf**)pkts,
> +                                                    cnt);
> +
>                      dpdk_queue_pkts(dev, qid,
>                                      (struct rte_mbuf
> **)&pkts[next_tx_idx],
> -                                    i-next_tx_idx);
> +                                    cnt);
>                  }
> 
>                  VLOG_WARN_RL(&rl, "Too big size %d max_packet_len %d",
> @@ -1289,9 +1430,12 @@ netdev_dpdk_send__(struct netdev_dpdk *dev, int
> qid,
>              }
>          }
>          if (next_tx_idx != cnt) {
> -           dpdk_queue_pkts(dev, qid,
> -                            (struct rte_mbuf **)&pkts[next_tx_idx],
> -                            cnt-next_tx_idx);
> +            cnt -= next_tx_idx;
> +
> +            cnt = netdev_dpdk_qos_process__(dev, (struct
> + rte_mbuf**)pkts, cnt);
> +
> +            dpdk_queue_pkts(dev, qid, (struct rte_mbuf
> **)&pkts[next_tx_idx],
> +                            cnt);
>          }
> 
>          if (OVS_UNLIKELY(dropped)) {
> @@ -2032,6 +2176,264 @@ unlock_dpdk:
>      return err;
>  }
> 
> +/* QoS Functions */
> +
> +/*
> + * Initialize QoS configuration operations.
> + */
> +static void
> +qos_conf_init(struct qos_conf *conf, const struct dpdk_qos_ops *ops) {
> +    conf->ops = ops;
> +}
> +
> +/*
> + * Search existing QoS operations in qos_ops and compare each set of
> + * operations qos_name to name. Return a dpdk_qos_ops pointer to a
> +match,
> + * else return NULL
> + */
> +static const struct dpdk_qos_ops *
> +qos_lookup_name(const char *name)
> +{
> +    const struct dpdk_qos_ops *const *opsp;
> +
> +    for (opsp = qos_confs; *opsp != NULL; opsp++) {
> +        const struct dpdk_qos_ops *ops = *opsp;
> +        if (!strncmp(name, ops->qos_name,DPDK_MAX_QOS_NAME_SIZE)) {
> +            return ops;
> +        }
> +    }
> +    return NULL;
> +}
> +
> +/*
> + * Call qos_destruct to clean up items associated with the netdevs
> + * qos_conf. Set netdevs qos_conf to NULL.
> + */
> +static void
> +qos_delete_conf(struct netdev *netdev_) {
> +    struct netdev_dpdk *netdev = netdev_dpdk_cast(netdev_);
> +
> +    rte_spinlock_lock(&netdev->qos_lock);
> +    if (netdev->qos_conf) {
> +        if (netdev->qos_conf->ops->qos_destruct) {
> +            netdev->qos_conf->ops->qos_destruct(netdev_, netdev-
> >qos_conf);
> +        }
> +        netdev->qos_conf = NULL;
> +    }
> +    rte_spinlock_unlock(&netdev->qos_lock);
> +}
> +
> +static int
> +netdev_dpdk_get_qos_types(const struct netdev *netdev OVS_UNUSED,
> +                           struct sset *types) {
> +    const struct dpdk_qos_ops *const *opsp;
> +
> +    for (opsp = qos_confs; *opsp != NULL; opsp++) {
> +        const struct dpdk_qos_ops *ops = *opsp;
> +        if (ops->qos_construct && ops->qos_name[0] != '\0') {
> +            sset_add(types, ops->qos_name);
> +        }
> +    }
> +    return 0;
> +}
> +
> +static int
> +netdev_dpdk_get_qos(const struct netdev *netdev_,
> +                    const char **typep, struct smap *details) {
> +    struct netdev_dpdk *netdev = netdev_dpdk_cast(netdev_);
> +    int error = 0;
> +
> +    ovs_mutex_lock(&netdev->mutex);
> +    if(netdev->qos_conf) {
> +        *typep = netdev->qos_conf->ops->qos_name;
> +        error = (netdev->qos_conf->ops->qos_get
> +                 ? netdev->qos_conf->ops->qos_get(netdev_, details):
> 0);
> +    }
> +    ovs_mutex_unlock(&netdev->mutex);
> +
> +    return error;
> +}
> +
> +static int
> +netdev_dpdk_set_qos(struct netdev *netdev_,
> +                    const char *type, const struct smap *details) {
> +    struct netdev_dpdk *netdev = netdev_dpdk_cast(netdev_);
> +    const struct dpdk_qos_ops *new_ops = NULL;
> +    int error = 0;
> +
> +    /* If type is empty the current QoS configuration for the dpdk-
> netdev can
> +     * be destroyed */
> +    if(type[0] == '\0') {
> +        qos_delete_conf(netdev_);
> +    }
> +
> +    new_ops = qos_lookup_name(type);
> +    if (!new_ops || !new_ops->qos_construct) {
> +        return EOPNOTSUPP;
> +    }
> +
> +    ovs_mutex_lock(&netdev->mutex);
> +    if (netdev->qos_conf) {
> +        if (new_ops == netdev->qos_conf->ops) {
> +            error = new_ops->qos_set ? new_ops->qos_set(netdev_,
> details) : 0;
> +        }
> +        else {
> +            /* Delete existing QoS configuration. */
> +            qos_delete_conf(netdev_);
> +            ovs_assert(netdev->qos_conf == NULL);
> +
> +            /* Install new QoS configuration. */
> +            error = new_ops->qos_construct(netdev_, details);
> +            ovs_assert((error == 0) == (netdev->qos_conf != NULL));
> +        }
> +    } else {
> +        error = new_ops->qos_construct(netdev_, details);
> +        ovs_assert((error == 0) == (netdev->qos_conf != NULL));
> +    }
> +
> +    ovs_mutex_unlock(&netdev->mutex);
> +    return error;
> +}
> +
> +/* egress-policer details */
> +
> +struct egress_policer {
> +    struct qos_conf qos_conf;
> +    struct rte_meter_srtcm_params app_srtcm_params;
> +    struct rte_meter_srtcm test_meter;
> +};
> +
> +static struct egress_policer *
> +egress_policer_get__(const struct netdev *netdev_) {
> +    struct netdev_dpdk *netdev = netdev_dpdk_cast(netdev_);
> +    return CONTAINER_OF(netdev->qos_conf, struct egress_policer,
> +qos_conf); }
> +
> +static int
> +egress_policer_qos_construct(struct netdev *netdev_,
> +                            const struct smap *details) {
> +    struct netdev_dpdk *netdev = netdev_dpdk_cast(netdev_);
> +    struct egress_policer *policer;
> +    const char *cir_s;
> +    const char *cbs_s;
> +    int err = 0;
> +
> +    rte_spinlock_lock(&netdev->qos_lock);
> +    policer = xmalloc(sizeof *policer);
> +    qos_conf_init(&policer->qos_conf, &egress_policer_ops);
> +    netdev->qos_conf = &policer->qos_conf;
> +    cir_s = smap_get(details, "cir");
> +    cbs_s = smap_get(details, "cbs");
> +    policer->app_srtcm_params.cir = cir_s ? strtoull(cir_s, NULL, 10) :
> 0;
> +    policer->app_srtcm_params.cbs = cbs_s ? strtoull(cbs_s, NULL, 10) :
> 0;
> +    policer->app_srtcm_params.ebs = 0;
> +    err = rte_meter_srtcm_config(&policer->test_meter,
> +                                    &policer->app_srtcm_params);
> +    rte_spinlock_unlock(&netdev->qos_lock);
> +
> +    return err;
> +}
> +
> +static void
> +egress_policer_qos_destruct(struct netdev *netdev_ OVS_UNUSED,
> +                        struct qos_conf *conf) {
> +    struct egress_policer *policer = CONTAINER_OF(conf, struct
> egress_policer,
> +                                                qos_conf);
> +    free(policer);
> +}
> +
> +static int
> +egress_policer_qos_get(const struct netdev *netdev, struct smap
> +*details) {
> +    struct egress_policer *policer = egress_policer_get__(netdev);
> +    smap_add_format(details, "cir", "%llu",
> +                    1ULL * policer->app_srtcm_params.cir);
> +    smap_add_format(details, "cbs", "%llu",
> +                    1ULL * policer->app_srtcm_params.cbs);
> +    return 0;
> +}
> +
> +static int
> +egress_policer_qos_set(struct netdev *netdev_, const struct smap
> +*details) {
> +    struct egress_policer *policer;
> +    const char *cir_s;
> +    const char *cbs_s;
> +    int err = 0;
> +
> +    policer = egress_policer_get__(netdev_);
> +    cir_s = smap_get(details, "cir");
> +    cbs_s = smap_get(details, "cbs");
> +    policer->app_srtcm_params.cir = cir_s ? strtoull(cir_s, NULL, 10) :
> 0;
> +    policer->app_srtcm_params.cbs = cbs_s ? strtoull(cbs_s, NULL, 10) :
> 0;
> +    policer->app_srtcm_params.ebs = 0;
> +    err = rte_meter_srtcm_config(&policer->test_meter,
> +                                    &policer->app_srtcm_params);
> +
> +    return err;
> +}
> +
> +static inline int
> +egress_policer_pkt_handle__(struct rte_meter_srtcm *meter,
> +                            struct rte_mbuf *pkt, uint64_t time) {
> +    uint8_t output_color;
> +    uint32_t pkt_len = rte_pktmbuf_pkt_len(pkt) - sizeof(struct
> ether_hdr);
> +    enum egress_policer_action action = GREEN;
> +
> +    /* color input is not used for blind modes */
> +    output_color = (uint8_t) rte_meter_srtcm_color_blind_check(meter,
> time,
> +
> + pkt_len);
> +
> +    /* Check output color, 0 corresponds to GREEN i.e. packet can be
> +     * transmitted. If greater than 0 then action is set to DROP. */
> +    if (output_color) {
> +        action = DROP;
> +    }
> +
> +    return action;
> +}
> +
> +static int
> +egress_policer_alg_process(struct netdev *netdev_, struct rte_mbuf
> **pkts,
> +                        int pkt_cnt)
> +{
> +    int i = 0;
> +    int cnt = pkt_cnt;
> +    struct egress_policer *policer = egress_policer_get__(netdev_);
> +    struct rte_mbuf *pkt = NULL;
> +    uint64_t current_time = rte_rdtsc();
> +
> +    for(i = 0; i < pkt_cnt; i++) {
> +        pkt = pkts[i];
> +        /* Handle current packet */
> +        if (egress_policer_pkt_handle__(&policer->test_meter, pkt,
> +                                        current_time) == DROP) {
> +            rte_pktmbuf_free(pkt);
> +            cnt = cnt - 1;
> +        }
> +    }
> +
> +    return cnt;
> +}
> +
> +static const struct dpdk_qos_ops egress_policer_ops = {
> +    "egress-policer",    /* qos_name */
> +    egress_policer_qos_construct,
> +    egress_policer_qos_destruct,
> +    egress_policer_qos_get,
> +    egress_policer_qos_set,
> +    egress_policer_alg_process
> +};
> +
>  #define NETDEV_DPDK_CLASS(NAME, INIT, CONSTRUCT, DESTRUCT, MULTIQ,
> SEND, \
>      GET_CARRIER, GET_STATS, GET_FEATURES, GET_STATUS, RXQ_RECV)
> \
>  {                                                             \
> @@ -2069,10 +2471,10 @@ unlock_dpdk:
>      NULL,                       /* set_advertisements */      \
>                                                                \
>      NULL,                       /* set_policing */            \
> -    NULL,                       /* get_qos_types */           \
> +    netdev_dpdk_get_qos_types,                                \
>      NULL,                       /* get_qos_capabilities */    \
> -    NULL,                       /* get_qos */                 \
> -    NULL,                       /* set_qos */                 \
> +    netdev_dpdk_get_qos,                                      \
> +    netdev_dpdk_set_qos,                                      \
>      NULL,                       /* get_queue */               \
>      NULL,                       /* set_queue */               \
>      NULL,                       /* delete_queue */            \
> diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml index
> 4dbd9e3..5be8eb6 100644
> --- a/vswitchd/vswitch.xml
> +++ b/vswitchd/vswitch.xml
> @@ -3298,6 +3298,26 @@
>            for information on how this classifier works.
>          </dd>
>        </dl>
> +      <dl>
> +        <dt><code>egress-policer</code></dt>
> +        <dd>
> +          An egress policer algorithm. This implementation uses the
> DPDK
> +          rte_meter library. The rte_meter library provides an
> implementation
> +          of srTCM (RFC2697) which allows the metering and policing of
> traffic.
> +          The implementation in OVS creates a color blind srTCM meter
> with a
> +          single token bucket used to police traffic. It should be
> noted that
> +          when the rte_meter is configured as part of QoS there will be
> a
> +          performance overhead as the rte_mter itself will consume CPU
> cycles
> +          in order to police traffic. These CPU cycles ordinarily are
> used for
> +          packet proccessing. As such the drop in performance will be
> noticed
> +          in terms of overall aggregate traffic throughput.
> +
> +          For more information regarding the usage of the DPDK
> rte_meter see
> +
> <code>http://dpdk.org/doc/guides/sample_app_ug/qos_metering.html</code>
> +          For more information regarding srTCM see
> +          <code>https://tools.ietf.org/html/rfc2697</code>
> +        </dd>
> +      </dl>
>      </column>
> 
>      <column name="queues">
> @@ -3334,6 +3354,38 @@
>        </column>
>      </group>
> 
> +    <group title="Configuration for egress-policer QoS">
> +      <p>
> +        <ref table="QoS"/> <ref table="QoS" column="type"/>
> +        <code>egress-policer</code> provides egress policing for
> userspace
> +        port types with DPDK.
> +
> +        It has the following key-value pairs defined.
> +      </p>
> +
> +      <column name="other_config" key="cir" type='{"type": "integer"}'>
> +        The Committed Information Rate (CIR) is measured in bytes of IP
> +        packets per second, i.e. it includes the IP header, but not
> link
> +        specific (e.g. Ethernet) headers. This represents the bytes per
> second
> +        rate at which the token bucket will be updated. The cir value
> is
> +        calculated by (pps x packet data size).  For example assuming a
> user
> +        wishes to limit a stream consisting of 64 byte packets to 1
> million
> +        packets per second the CIR would be set to to to 46000000. This
> value
> +        can be broken into '1,000,000 x 46'. Where 1,000,000 is the
> policing
> +        rate for the number of packets per second and 46 represents the
> size
> +        of the packet data for a 64 byte ip packet.
> +      </column>
> +      <column name="other_config" key="cbs" type='{"type": "integer"}'>
> +        The Committed Burst Size (CBS) is measured in bytes and
> represents a
> +        token bucket. At a minimum this value should be be set to the
> expected
> +        largest size packet in the traffic stream. In practice larger
> values
> +        may be used to increase the size of the token bucket. If a
> packet can
> +        be transmitted then the cbs will be decremented by the number
> of
> +        bytes/tokens of the packet. If there are not enough tokens in
> the cbs
> +        bucket the packet will be dropped.
> +      </column>
> +    </group>
> +
>      <group title="Common Columns">
>        The overall purpose of these columns is described under
> <code>Common
>        Columns</code> at the beginning of this document.
> --
> 1.7.4.1




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