text: /*
   * Copyright (c) 2014, 2015, 2016, 2017 Nicira, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at:
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <config.h>
  #include "netdev-dpdk.h"
  
  #include <string.h>
  #include <signal.h>
  #include <stdlib.h>
  #include <errno.h>
  #include <unistd.h>
  
  #include <rte_config.h>
  #include <rte_cycles.h>
  #include <rte_errno.h>
  #include <rte_eth_ring.h>
  #include <rte_ethdev.h>
  #include <rte_malloc.h>
  #include <rte_mbuf.h>
  #include <rte_meter.h>
  #include <rte_virtio_net.h>
  
  #include "dirs.h"
  #include "dp-packet.h"
  #include "dpdk.h"
  #include "dpif-netdev.h"
  #include "fatal-signal.h"
  #include "netdev-provider.h"
  #include "netdev-vport.h"
  #include "odp-util.h"
  #include "openvswitch/dynamic-string.h"
  #include "openvswitch/list.h"
  #include "openvswitch/ofp-print.h"
  #include "openvswitch/vlog.h"
  #include "ovs-numa.h"
  #include "ovs-thread.h"
  #include "ovs-rcu.h"
  #include "packets.h"
  #include "openvswitch/shash.h"
  #include "smap.h"
  #include "sset.h"
  #include "unaligned.h"
  #include "timeval.h"
  #include "unixctl.h"
  
  VLOG_DEFINE_THIS_MODULE(netdev_dpdk);
  static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
  
  #define DPDK_PORT_WATCHDOG_INTERVAL 5
  
  #define OVS_CACHE_LINE_SIZE CACHE_LINE_SIZE
  #define OVS_VPORT_DPDK "ovs_dpdk"
  
  /*
   * need to reserve tons of extra space in the mbufs so we can align the
   * DMA addresses to 4KB.
   * The minimum mbuf size is limited to avoid scatter behaviour and drop in
   * performance for standard Ethernet MTU.
   */
  #define ETHER_HDR_MAX_LEN           (ETHER_HDR_LEN + ETHER_CRC_LEN \
                                       + (2 * VLAN_HEADER_LEN))
  #define MTU_TO_FRAME_LEN(mtu)       ((mtu) + ETHER_HDR_LEN + ETHER_CRC_LEN)
  #define MTU_TO_MAX_FRAME_LEN(mtu)   ((mtu) + ETHER_HDR_MAX_LEN)
  #define FRAME_LEN_TO_MTU(frame_len) ((frame_len)                    \
                                       - ETHER_HDR_LEN - ETHER_CRC_LEN)
  #define MBUF_SIZE(mtu)              (MTU_TO_MAX_FRAME_LEN(mtu)      \
                                       + sizeof(struct dp_packet)     \
                                       + RTE_PKTMBUF_HEADROOM)
  #define NETDEV_DPDK_MBUF_ALIGN      1024
  #define NETDEV_DPDK_MAX_PKT_LEN     9728
  
  /* Max and min number of packets in the mempool.  OVS tries to allocate a
   * mempool with MAX_NB_MBUF: if this fails (because the system doesn't have
   * enough hugepages) we keep halving the number until the allocation succeeds
   * or we reach MIN_NB_MBUF */
  
  #define MAX_NB_MBUF          (4096 * 64)
  #define MIN_NB_MBUF          (4096 * 4)
  #define MP_CACHE_SZ          RTE_MEMPOOL_CACHE_MAX_SIZE
  
  /* MAX_NB_MBUF can be divided by 2 many times, until MIN_NB_MBUF */
  BUILD_ASSERT_DECL(MAX_NB_MBUF % ROUND_DOWN_POW2(MAX_NB_MBUF/MIN_NB_MBUF) == 0);
  
  /* The smallest possible NB_MBUF that we're going to try should be a multiple
   * of MP_CACHE_SZ. This is advised by DPDK documentation. */
  BUILD_ASSERT_DECL((MAX_NB_MBUF / ROUND_DOWN_POW2(MAX_NB_MBUF/MIN_NB_MBUF))
                    % MP_CACHE_SZ == 0);
  
  /*
   * DPDK XSTATS Counter names definition
   */
  #define XSTAT_RX_64_PACKETS              "rx_size_64_packets"
  #define XSTAT_RX_65_TO_127_PACKETS       "rx_size_65_to_127_packets"
  #define XSTAT_RX_128_TO_255_PACKETS      "rx_size_128_to_255_packets"
  #define XSTAT_RX_256_TO_511_PACKETS      "rx_size_256_to_511_packets"
  #define XSTAT_RX_512_TO_1023_PACKETS     "rx_size_512_to_1023_packets"
  #define XSTAT_RX_1024_TO_1522_PACKETS    "rx_size_1024_to_1522_packets"
  #define XSTAT_RX_1523_TO_MAX_PACKETS     "rx_size_1523_to_max_packets"
  
  #define XSTAT_TX_64_PACKETS              "tx_size_64_packets"
  #define XSTAT_TX_65_TO_127_PACKETS       "tx_size_65_to_127_packets"
  #define XSTAT_TX_128_TO_255_PACKETS      "tx_size_128_to_255_packets"
  #define XSTAT_TX_256_TO_511_PACKETS      "tx_size_256_to_511_packets"
  #define XSTAT_TX_512_TO_1023_PACKETS     "tx_size_512_to_1023_packets"
  #define XSTAT_TX_1024_TO_1522_PACKETS    "tx_size_1024_to_1522_packets"
  #define XSTAT_TX_1523_TO_MAX_PACKETS     "tx_size_1523_to_max_packets"
  
  #define XSTAT_RX_MULTICAST_PACKETS       "rx_multicast_packets"
  #define XSTAT_TX_MULTICAST_PACKETS       "tx_multicast_packets"
  #define XSTAT_RX_BROADCAST_PACKETS       "rx_broadcast_packets"
  #define XSTAT_TX_BROADCAST_PACKETS       "tx_broadcast_packets"
  #define XSTAT_RX_UNDERSIZED_ERRORS       "rx_undersized_errors"
  #define XSTAT_RX_OVERSIZE_ERRORS         "rx_oversize_errors"
  #define XSTAT_RX_FRAGMENTED_ERRORS       "rx_fragmented_errors"
  #define XSTAT_RX_JABBER_ERRORS           "rx_jabber_errors"
  
  #define SOCKET0              0
  
  /* Default size of Physical NIC RXQ */
  #define NIC_PORT_DEFAULT_RXQ_SIZE 2048
  /* Default size of Physical NIC TXQ */
  #define NIC_PORT_DEFAULT_TXQ_SIZE 2048
  /* Maximum size of Physical NIC Queues */
  #define NIC_PORT_MAX_Q_SIZE 4096
  
  #define OVS_VHOST_MAX_QUEUE_NUM 1024  /* Maximum number of vHost TX queues. */
  #define OVS_VHOST_QUEUE_MAP_UNKNOWN (-1) /* Mapping not initialized. */
  #define OVS_VHOST_QUEUE_DISABLED    (-2) /* Queue was disabled by guest and not
                                            * yet mapped to another queue. */
  
  #define DPDK_ETH_PORT_ID_INVALID    RTE_MAX_ETHPORTS
  
  /* DPDK library uses uint8_t for port_id. */
  typedef uint8_t dpdk_port_t;
  
  #define VHOST_ENQ_RETRY_NUM 8
  #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
  
  static const struct rte_eth_conf port_conf = {
      .rxmode = {
          .mq_mode = ETH_MQ_RX_RSS,
          .split_hdr_size = 0,
          .header_split   = 0, /* Header Split disabled */
          .hw_ip_checksum = 0, /* IP checksum offload disabled */
          .hw_vlan_filter = 0, /* VLAN filtering disabled */
          .jumbo_frame    = 0, /* Jumbo Frame Support disabled */
          .hw_strip_crc   = 0,
      },
      .rx_adv_conf = {
          .rss_conf = {
              .rss_key = NULL,
              .rss_hf = ETH_RSS_IP | ETH_RSS_UDP | ETH_RSS_TCP,
          },
      },
      .txmode = {
          .mq_mode = ETH_MQ_TX_NONE,
      },
  };
  
  enum { DPDK_RING_SIZE = 256 };
  BUILD_ASSERT_DECL(IS_POW2(DPDK_RING_SIZE));
  enum { DRAIN_TSC = 200000ULL };
  
  enum dpdk_dev_type {
      DPDK_DEV_ETH = 0,
      DPDK_DEV_VHOST = 1,
  };
  
  /* 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;
      rte_spinlock_t lock;
  };
  
  /* 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 a qos_conf object. The implementation should make
       * the appropriate calls to configure QoS according to '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)).
       *
       * This function must return 0 if and only if it sets '*conf' to an
       * initialized 'struct qos_conf'.
       *
       * For all QoS implementations it should always be non-null.
       */
      int (*qos_construct)(const struct smap *details, struct qos_conf **conf);
  
      /* 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 qos_conf *conf);
  
      /* Retrieves details of '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 qos_conf *conf, struct smap *details);
  
      /* Returns true if 'conf' is already configured according to '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)).
       *
       * For all QoS implementations it should always be non-null.
       */
      bool (*qos_is_equal)(const struct qos_conf *conf,
                           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_run)(struct qos_conf *qos_conf, 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
  };
  
  static struct ovs_mutex dpdk_mutex = OVS_MUTEX_INITIALIZER;
  
  /* Contains all 'struct dpdk_dev's. */
  static struct ovs_list dpdk_list OVS_GUARDED_BY(dpdk_mutex)
      = OVS_LIST_INITIALIZER(&dpdk_list);
  
  static struct ovs_mutex dpdk_mp_mutex OVS_ACQ_AFTER(dpdk_mutex)
      = OVS_MUTEX_INITIALIZER;
  
  static struct ovs_list dpdk_mp_list OVS_GUARDED_BY(dpdk_mp_mutex)
      = OVS_LIST_INITIALIZER(&dpdk_mp_list);
  
  struct dpdk_mp {
      struct rte_mempool *mp;
      int mtu;
      int socket_id;
      int refcount;
      struct ovs_list list_node OVS_GUARDED_BY(dpdk_mp_mutex);
  };
  
  /* There should be one 'struct dpdk_tx_queue' created for
   * each cpu core. */
  struct dpdk_tx_queue {
      rte_spinlock_t tx_lock;        /* Protects the members and the NIC queue
                                      * from concurrent access.  It is used only
                                      * if the queue is shared among different
                                      * pmd threads (see 'concurrent_txq'). */
      int map;                       /* Mapping of configured vhost-user queues
                                      * to enabled by guest. */
  };
  
  /* dpdk has no way to remove dpdk ring ethernet devices
     so we have to keep them around once they've been created
  */
  
  static struct ovs_list dpdk_ring_list OVS_GUARDED_BY(dpdk_mutex)
      = OVS_LIST_INITIALIZER(&dpdk_ring_list);
  
  struct dpdk_ring {
      /* For the client rings */
      struct rte_ring *cring_tx;
      struct rte_ring *cring_rx;
      unsigned int user_port_id; /* User given port no, parsed from port name */
      dpdk_port_t eth_port_id; /* ethernet device port id */
      struct ovs_list list_node OVS_GUARDED_BY(dpdk_mutex);
  };
  
  struct ingress_policer {
      struct rte_meter_srtcm_params app_srtcm_params;
      struct rte_meter_srtcm in_policer;
      rte_spinlock_t policer_lock;
  };
  
  enum dpdk_hw_ol_features {
      NETDEV_RX_CHECKSUM_OFFLOAD = 1 << 0,
  };
  
  struct netdev_dpdk {
      struct netdev up;
      dpdk_port_t port_id;
      int max_packet_len;
      enum dpdk_dev_type type;
  
      struct dpdk_tx_queue *tx_q;
  
      struct ovs_mutex mutex OVS_ACQ_AFTER(dpdk_mutex);
  
      struct dpdk_mp *dpdk_mp;
      int mtu;
      int socket_id;
      int buf_size;
      struct netdev_stats stats;
      /* Protects stats */
      rte_spinlock_t stats_lock;
  
      struct eth_addr hwaddr;
      enum netdev_flags flags;
  
      struct rte_eth_link link;
      int link_reset_cnt;
  
      /* virtio identifier for vhost devices */
      ovsrcu_index vid;
  
      /* True if vHost device is 'up' and has been reconfigured at least once */
      bool vhost_reconfigured;
  
      /* Identifier used to distinguish vhost devices from each other. */
      char vhost_id[PATH_MAX];
  
      /* Device arguments for dpdk ports */
      char *devargs;
  
      /* If true, device was attached by rte_eth_dev_attach(). */
      bool attached;
  
      /* In dpdk_list. */
      struct ovs_list list_node OVS_GUARDED_BY(dpdk_mutex);
  
      /* QoS configuration and lock for the device */
      OVSRCU_TYPE(struct qos_conf *) qos_conf;
  
      /* The following properties cannot be changed when a device is running,
       * so we remember the request and update them next time
       * netdev_dpdk*_reconfigure() is called */
      int requested_mtu;
      int requested_n_txq;
      int requested_n_rxq;
      int requested_rxq_size;
      int requested_txq_size;
  
      /* Number of rx/tx descriptors for physical devices */
      int rxq_size;
      int txq_size;
  
      /* Socket ID detected when vHost device is brought up */
      int requested_socket_id;
  
      /* Denotes whether vHost port is client/server mode */
      uint64_t vhost_driver_flags;
  
      /* Ingress Policer */
      OVSRCU_TYPE(struct ingress_policer *) ingress_policer;
      uint32_t policer_rate;
      uint32_t policer_burst;
  
      /* DPDK-ETH Flow control */
      struct rte_eth_fc_conf fc_conf;
  
      /* DPDK-ETH hardware offload features,
       * from the enum set 'dpdk_hw_ol_features' */
      uint32_t hw_ol_features;
  };
  
  struct netdev_rxq_dpdk {
      struct netdev_rxq up;
      dpdk_port_t port_id;
  };
  
  static int netdev_dpdk_class_init(void);
  static int netdev_dpdk_vhost_class_init(void);
  
  int netdev_dpdk_get_vid(const struct netdev_dpdk *dev);
  
  struct ingress_policer *
  netdev_dpdk_get_ingress_policer(const struct netdev_dpdk *dev);
  
  static bool
  is_dpdk_class(const struct netdev_class *class)
  {
      return class->init == netdev_dpdk_class_init
             || class->init == netdev_dpdk_vhost_class_init;
  }
  
  /* DPDK NIC drivers allocate RX buffers at a particular granularity, typically
   * aligned at 1k or less. If a declared mbuf size is not a multiple of this
   * value, insufficient buffers are allocated to accomodate the packet in its
   * entirety. Furthermore, certain drivers need to ensure that there is also
   * sufficient space in the Rx buffer to accommodate two VLAN tags (for QinQ
   * frames). If the RX buffer is too small, then the driver enables scatter RX
   * behaviour, which reduces performance. To prevent this, use a buffer size
   * that is closest to 'mtu', but which satisfies the aforementioned criteria.
   */
  static uint32_t
  dpdk_buf_size(int mtu)
  {
      return ROUND_UP((MTU_TO_MAX_FRAME_LEN(mtu) + RTE_PKTMBUF_HEADROOM),
                       NETDEV_DPDK_MBUF_ALIGN);
  }
  
  /* Allocates an area of 'sz' bytes from DPDK.  The memory is zero'ed.
   *
   * Unlike xmalloc(), this function can return NULL on failure. */
  static void *
  dpdk_rte_mzalloc(size_t sz)
  {
      return rte_zmalloc(OVS_VPORT_DPDK, sz, OVS_CACHE_LINE_SIZE);
  }
  
  void
  free_dpdk_buf(struct dp_packet *p)
  {
      struct rte_mbuf *pkt = (struct rte_mbuf *) p;
  
      rte_pktmbuf_free(pkt);
  }
  
  static void
  ovs_rte_pktmbuf_init(struct rte_mempool *mp OVS_UNUSED,
                       void *opaque_arg OVS_UNUSED,
                       void *_p,
                       unsigned i OVS_UNUSED)
  {
      struct rte_mbuf *pkt = _p;
  
      dp_packet_init_dpdk((struct dp_packet *) pkt, pkt->buf_len);
  }
  
  static struct dpdk_mp *
  dpdk_mp_create(int socket_id, int mtu)
  {
      struct dpdk_mp *dmp;
      unsigned mp_size;
      char *mp_name;
  
      dmp = dpdk_rte_mzalloc(sizeof *dmp);
      if (!dmp) {
          return NULL;
      }
      dmp->socket_id = socket_id;
      dmp->mtu = mtu;
      dmp->refcount = 1;
      /* XXX: this is a really rough method of provisioning memory.
       * It's impossible to determine what the exact memory requirements are
       * when the number of ports and rxqs that utilize a particular mempool can
       * change dynamically at runtime. For now, use this rough heurisitic.
       */
      if (mtu >= ETHER_MTU) {
          mp_size = MAX_NB_MBUF;
      } else {
          mp_size = MIN_NB_MBUF;
      }
  
      do {
          mp_name = xasprintf("ovs_mp_%d_%d_%u", dmp->mtu, dmp->socket_id,
                              mp_size);
  
          dmp->mp = rte_pktmbuf_pool_create(mp_name, mp_size,
                                            MP_CACHE_SZ,
                                            sizeof (struct dp_packet)
                                                   - sizeof (struct rte_mbuf),
                                            MBUF_SIZE(mtu)
                                                   - sizeof(struct dp_packet),
                                            socket_id);
          if (dmp->mp) {
              VLOG_DBG("Allocated \"%s\" mempool with %u mbufs",
                       mp_name, mp_size);
          }
          free(mp_name);
          if (dmp->mp) {
              /* rte_pktmbuf_pool_create has done some initialization of the
               * rte_mbuf part of each dp_packet, while ovs_rte_pktmbuf_init
               * initializes some OVS specific fields of dp_packet.
               */
              rte_mempool_obj_iter(dmp->mp, ovs_rte_pktmbuf_init, NULL);
              return dmp;
          }
      } while (rte_errno == ENOMEM && (mp_size /= 2) >= MIN_NB_MBUF);
  
      rte_free(dmp);
      return NULL;
  }
  
  static struct dpdk_mp *
  dpdk_mp_get(int socket_id, int mtu)
  {
      struct dpdk_mp *dmp;
  
      ovs_mutex_lock(&dpdk_mp_mutex);
      LIST_FOR_EACH (dmp, list_node, &dpdk_mp_list) {
          if (dmp->socket_id == socket_id && dmp->mtu == mtu) {
              dmp->refcount++;
              goto out;
          }
      }
  
      dmp = dpdk_mp_create(socket_id, mtu);
      if (dmp) {
          ovs_list_push_back(&dpdk_mp_list, &dmp->list_node);
      }
  
  out:
      ovs_mutex_unlock(&dpdk_mp_mutex);
  
      return dmp;
  }
  
  static void
  dpdk_mp_put(struct dpdk_mp *dmp)
  {
      if (!dmp) {
          return;
      }
  
      ovs_mutex_lock(&dpdk_mp_mutex);
      ovs_assert(dmp->refcount);
  
      if (!--dmp->refcount) {
          ovs_list_remove(&dmp->list_node);
          rte_mempool_free(dmp->mp);
          rte_free(dmp);
      }
      ovs_mutex_unlock(&dpdk_mp_mutex);
  }
  
  /* Tries to allocate new mempool on requested_socket_id with
   * mbuf size corresponding to requested_mtu.
   * On success new configuration will be applied.
   * On error, device will be left unchanged. */
  static int
  netdev_dpdk_mempool_configure(struct netdev_dpdk *dev)
      OVS_REQUIRES(dev->mutex)
  {
      uint32_t buf_size = dpdk_buf_size(dev->requested_mtu);
      struct dpdk_mp *mp;
  
      mp = dpdk_mp_get(dev->requested_socket_id, FRAME_LEN_TO_MTU(buf_size));
      if (!mp) {
          VLOG_ERR("Failed to create memory pool for netdev "
                   "%s, with MTU %d on socket %d: %s\n",
                   dev->up.name, dev->requested_mtu, dev->requested_socket_id,
                   rte_strerror(rte_errno));
          return rte_errno;
      } else {
          dpdk_mp_put(dev->dpdk_mp);
          dev->dpdk_mp = mp;
          dev->mtu = dev->requested_mtu;
          dev->socket_id = dev->requested_socket_id;
          dev->max_packet_len = MTU_TO_FRAME_LEN(dev->mtu);
      }
  
      return 0;
  }
  
  static void
  check_link_status(struct netdev_dpdk *dev)
  {
      struct rte_eth_link link;
  
      rte_eth_link_get_nowait(dev->port_id, &link);
  
      if (dev->link.link_status != link.link_status) {
          netdev_change_seq_changed(&dev->up);
  
          dev->link_reset_cnt++;
          dev->link = link;
          if (dev->link.link_status) {
              VLOG_DBG_RL(&rl, "Port %"PRIu8" Link Up - speed %u Mbps - %s",
                          dev->port_id, (unsigned) dev->link.link_speed,
                          (dev->link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
                           ("full-duplex") : ("half-duplex"));
          } else {
              VLOG_DBG_RL(&rl, "Port %"PRIu8" Link Down", dev->port_id);
          }
      }
  }
  
  static void *
  dpdk_watchdog(void *dummy OVS_UNUSED)
  {
      struct netdev_dpdk *dev;
  
      pthread_detach(pthread_self());
  
      for (;;) {
          ovs_mutex_lock(&dpdk_mutex);
          LIST_FOR_EACH (dev, list_node, &dpdk_list) {
              ovs_mutex_lock(&dev->mutex);
              if (dev->type == DPDK_DEV_ETH) {
                  check_link_status(dev);
              }
              ovs_mutex_unlock(&dev->mutex);
          }
          ovs_mutex_unlock(&dpdk_mutex);
          xsleep(DPDK_PORT_WATCHDOG_INTERVAL);
      }
  
      return NULL;
  }
  
  static int
  dpdk_eth_dev_queue_setup(struct netdev_dpdk *dev, int n_rxq, int n_txq)
  {
      int diag = 0;
      int i;
      struct rte_eth_conf conf = port_conf;
  
      if (dev->mtu > ETHER_MTU) {
          conf.rxmode.jumbo_frame = 1;
          conf.rxmode.max_rx_pkt_len = dev->max_packet_len;
      } else {
          conf.rxmode.jumbo_frame = 0;
          conf.rxmode.max_rx_pkt_len = 0;
      }
      conf.rxmode.hw_ip_checksum = (dev->hw_ol_features &
                                    NETDEV_RX_CHECKSUM_OFFLOAD) != 0;
      /* A device may report more queues than it makes available (this has
       * been observed for Intel xl710, which reserves some of them for
       * SRIOV):  rte_eth_*_queue_setup will fail if a queue is not
       * available.  When this happens we can retry the configuration
       * and request less queues */
      while (n_rxq && n_txq) {
          if (diag) {
              VLOG_INFO("Retrying setup with (rxq:%d txq:%d)", n_rxq, n_txq);
          }
  
          diag = rte_eth_dev_configure(dev->port_id, n_rxq, n_txq, &conf);
          if (diag) {
              VLOG_WARN("Interface %s eth_dev setup error %s\n",
                        dev->up.name, rte_strerror(-diag));
              break;
          }
  
          for (i = 0; i < n_txq; i++) {
              diag = rte_eth_tx_queue_setup(dev->port_id, i, dev->txq_size,
                                            dev->socket_id, NULL);
              if (diag) {
                  VLOG_INFO("Interface %s txq(%d) setup error: %s",
                            dev->up.name, i, rte_strerror(-diag));
                  break;
              }
          }
  
          if (i != n_txq) {
              /* Retry with less tx queues */
              n_txq = i;
              continue;
          }
  
          for (i = 0; i < n_rxq; i++) {
              diag = rte_eth_rx_queue_setup(dev->port_id, i, dev->rxq_size,
                                            dev->socket_id, NULL,
                                            dev->dpdk_mp->mp);
              if (diag) {
                  VLOG_INFO("Interface %s rxq(%d) setup error: %s",
                            dev->up.name, i, rte_strerror(-diag));
                  break;
              }
          }
  
          if (i != n_rxq) {
              /* Retry with less rx queues */
              n_rxq = i;
              continue;
          }
  
          dev->up.n_rxq = n_rxq;
          dev->up.n_txq = n_txq;
  
          return 0;
      }
  
      return diag;
  }
  
  static void
  dpdk_eth_checksum_offload_configure(struct netdev_dpdk *dev)
      OVS_REQUIRES(dev->mutex)
  {
      struct rte_eth_dev_info info;
      bool rx_csum_ol_flag = false;
      uint32_t rx_chksm_offload_capa = DEV_RX_OFFLOAD_UDP_CKSUM |
                                       DEV_RX_OFFLOAD_TCP_CKSUM |
                                       DEV_RX_OFFLOAD_IPV4_CKSUM;
      rte_eth_dev_info_get(dev->port_id, &info);
      rx_csum_ol_flag = (dev->hw_ol_features & NETDEV_RX_CHECKSUM_OFFLOAD) != 0;
  
      if (rx_csum_ol_flag &&
          (info.rx_offload_capa & rx_chksm_offload_capa) !=
           rx_chksm_offload_capa) {
          VLOG_WARN_ONCE("Rx checksum offload is not supported on device %"PRIu8,
                         dev->port_id);
          dev->hw_ol_features &= ~NETDEV_RX_CHECKSUM_OFFLOAD;
          return;
      }
      netdev_request_reconfigure(&dev->up);
  }
  
  static void
  dpdk_eth_flow_ctrl_setup(struct netdev_dpdk *dev) OVS_REQUIRES(dev->mutex)
  {
      if (rte_eth_dev_flow_ctrl_set(dev->port_id, &dev->fc_conf)) {
          VLOG_WARN("Failed to enable flow control on device %"PRIu8,
                    dev->port_id);
      }
  }
  
  static int
  dpdk_eth_dev_init(struct netdev_dpdk *dev)
      OVS_REQUIRES(dev->mutex)
  {
      struct rte_pktmbuf_pool_private *mbp_priv;
      struct rte_eth_dev_info info;
      struct ether_addr eth_addr;
      int diag;
      int n_rxq, n_txq;
  
      rte_eth_dev_info_get(dev->port_id, &info);
  
      n_rxq = MIN(info.max_rx_queues, dev->up.n_rxq);
      n_txq = MIN(info.max_tx_queues, dev->up.n_txq);
  
      diag = dpdk_eth_dev_queue_setup(dev, n_rxq, n_txq);
      if (diag) {
          VLOG_ERR("Interface %s(rxq:%d txq:%d) configure error: %s",
                   dev->up.name, n_rxq, n_txq, rte_strerror(-diag));
          return -diag;
      }
  
      diag = rte_eth_dev_start(dev->port_id);
      if (diag) {
          VLOG_ERR("Interface %s start error: %s", dev->up.name,
                   rte_strerror(-diag));
          return -diag;
      }
  
      rte_eth_promiscuous_enable(dev->port_id);
      rte_eth_allmulticast_enable(dev->port_id);
  
      memset(&eth_addr, 0x0, sizeof(eth_addr));
      rte_eth_macaddr_get(dev->port_id, &eth_addr);
      VLOG_INFO_RL(&rl, "Port %"PRIu8": "ETH_ADDR_FMT,
                      dev->port_id, ETH_ADDR_BYTES_ARGS(eth_addr.addr_bytes));
  
      memcpy(dev->hwaddr.ea, eth_addr.addr_bytes, ETH_ADDR_LEN);
      rte_eth_link_get_nowait(dev->port_id, &dev->link);
  
      mbp_priv = rte_mempool_get_priv(dev->dpdk_mp->mp);
      dev->buf_size = mbp_priv->mbuf_data_room_size - RTE_PKTMBUF_HEADROOM;
  
      /* Get the Flow control configuration for DPDK-ETH */
      diag = rte_eth_dev_flow_ctrl_get(dev->port_id, &dev->fc_conf);
      if (diag) {
          VLOG_DBG("cannot get flow control parameters on port=%"PRIu8", err=%d",
                   dev->port_id, diag);
      }
  
      return 0;
  }
  
  static struct netdev_dpdk *
  netdev_dpdk_cast(const struct netdev *netdev)
  {
      return CONTAINER_OF(netdev, struct netdev_dpdk, up);
  }
  
  static struct netdev *
  netdev_dpdk_alloc(void)
  {
      struct netdev_dpdk *dev;
  
      dev = dpdk_rte_mzalloc(sizeof *dev);
      if (dev) {
          return &dev->up;
      }
  
      return NULL;
  }
  
  static struct dpdk_tx_queue *
  netdev_dpdk_alloc_txq(unsigned int n_txqs)
  {
      struct dpdk_tx_queue *txqs;
      unsigned i;
  
      txqs = dpdk_rte_mzalloc(n_txqs * sizeof *txqs);
      if (txqs) {
          for (i = 0; i < n_txqs; i++) {
              /* Initialize map for vhost devices. */
              txqs[i].map = OVS_VHOST_QUEUE_MAP_UNKNOWN;
              rte_spinlock_init(&txqs[i].tx_lock);
          }
      }
  
      return txqs;
  }
  
  static int
  common_construct(struct netdev *netdev, dpdk_port_t port_no,
                   enum dpdk_dev_type type, int socket_id)
      OVS_REQUIRES(dpdk_mutex)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_init(&dev->mutex);
  
      rte_spinlock_init(&dev->stats_lock);
  
      /* If the 'sid' is negative, it means that the kernel fails
       * to obtain the pci numa info.  In that situation, always
       * use 'SOCKET0'. */
      dev->socket_id = socket_id < 0 ? SOCKET0 : socket_id;
      dev->requested_socket_id = dev->socket_id;
      dev->port_id = port_no;
      dev->type = type;
      dev->flags = 0;
      dev->requested_mtu = ETHER_MTU;
      dev->max_packet_len = MTU_TO_FRAME_LEN(dev->mtu);
      ovsrcu_index_init(&dev->vid, -1);
      dev->vhost_reconfigured = false;
      dev->attached = false;
  
      ovsrcu_init(&dev->qos_conf, NULL);
  
      ovsrcu_init(&dev->ingress_policer, NULL);
      dev->policer_rate = 0;
      dev->policer_burst = 0;
  
      netdev->n_rxq = 0;
      netdev->n_txq = 0;
      dev->requested_n_rxq = NR_QUEUE;
      dev->requested_n_txq = NR_QUEUE;
      dev->requested_rxq_size = NIC_PORT_DEFAULT_RXQ_SIZE;
      dev->requested_txq_size = NIC_PORT_DEFAULT_TXQ_SIZE;
  
      /* Initialize the flow control to NULL */
      memset(&dev->fc_conf, 0, sizeof dev->fc_conf);
  
      /* Initilize the hardware offload flags to 0 */
      dev->hw_ol_features = 0;
  
      dev->flags = NETDEV_UP | NETDEV_PROMISC;
  
      ovs_list_push_back(&dpdk_list, &dev->list_node);
  
      netdev_request_reconfigure(netdev);
  
      return 0;
  }
  
  /* dev_name must be the prefix followed by a positive decimal number.
   * (no leading + or - signs are allowed) */
  static int
  dpdk_dev_parse_name(const char dev_name[], const char prefix[],
                      unsigned int *port_no)
  {
      const char *cport;
  
      if (strncmp(dev_name, prefix, strlen(prefix))) {
          return ENODEV;
      }
  
      cport = dev_name + strlen(prefix);
  
      if (str_to_uint(cport, 10, port_no)) {
          return 0;
      } else {
          return ENODEV;
      }
  }
  
  static int
  vhost_common_construct(struct netdev *netdev)
      OVS_REQUIRES(dpdk_mutex)
  {
      int socket_id = rte_lcore_to_socket_id(rte_get_master_lcore());
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      dev->tx_q = netdev_dpdk_alloc_txq(OVS_VHOST_MAX_QUEUE_NUM);
      if (!dev->tx_q) {
          return ENOMEM;
      }
  
      return common_construct(netdev, DPDK_ETH_PORT_ID_INVALID,
                              DPDK_DEV_VHOST, socket_id);
  }
  
  static int
  netdev_dpdk_vhost_construct(struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      const char *name = netdev->name;
      int err;
  
      /* 'name' is appended to 'vhost_sock_dir' and used to create a socket in
       * the file system. '/' or '\' would traverse directories, so they're not
       * acceptable in 'name'. */
      if (strchr(name, '/') || strchr(name, '\\')) {
          VLOG_ERR("\"%s\" is not a valid name for a vhost-user port. "
                   "A valid name must not include '/' or '\\'",
                   name);
          return EINVAL;
      }
  
      ovs_mutex_lock(&dpdk_mutex);
      /* Take the name of the vhost-user port and append it to the location where
       * the socket is to be created, then register the socket.
       */
      snprintf(dev->vhost_id, sizeof dev->vhost_id, "%s/%s",
               dpdk_get_vhost_sock_dir(), name);
  
      dev->vhost_driver_flags &= ~RTE_VHOST_USER_CLIENT;
      err = rte_vhost_driver_register(dev->vhost_id, dev->vhost_driver_flags);
      if (err) {
          VLOG_ERR("vhost-user socket device setup failure for socket %s\n",
                   dev->vhost_id);
      } else {
          fatal_signal_add_file_to_unlink(dev->vhost_id);
          VLOG_INFO("Socket %s created for vhost-user port %s\n",
                    dev->vhost_id, name);
      }
      err = vhost_common_construct(netdev);
  
      ovs_mutex_unlock(&dpdk_mutex);
      return err;
  }
  
  static int
  netdev_dpdk_vhost_client_construct(struct netdev *netdev)
  {
      int err;
  
      ovs_mutex_lock(&dpdk_mutex);
      err = vhost_common_construct(netdev);
      ovs_mutex_unlock(&dpdk_mutex);
      return err;
  }
  
  static int
  netdev_dpdk_construct(struct netdev *netdev)
  {
      int err;
  
      ovs_mutex_lock(&dpdk_mutex);
      err = common_construct(netdev, DPDK_ETH_PORT_ID_INVALID,
                             DPDK_DEV_ETH, SOCKET0);
      ovs_mutex_unlock(&dpdk_mutex);
      return err;
  }
  
  static void
  common_destruct(struct netdev_dpdk *dev)
      OVS_REQUIRES(dpdk_mutex)
      OVS_EXCLUDED(dev->mutex)
  {
      rte_free(dev->tx_q);
      dpdk_mp_put(dev->dpdk_mp);
  
      ovs_list_remove(&dev->list_node);
      free(ovsrcu_get_protected(struct ingress_policer *,
                                &dev->ingress_policer));
      ovs_mutex_destroy(&dev->mutex);
  }
  
  static void
  netdev_dpdk_destruct(struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      char devname[RTE_ETH_NAME_MAX_LEN];
  
      ovs_mutex_lock(&dpdk_mutex);
  
      rte_eth_dev_stop(dev->port_id);
  
      if (dev->attached) {
          rte_eth_dev_close(dev->port_id);
          if (rte_eth_dev_detach(dev->port_id, devname) < 0) {
              VLOG_ERR("Device '%s' can not be detached", dev->devargs);
          } else {
              VLOG_INFO("Device '%s' detached", devname);
          }
      }
  
      free(dev->devargs);
      common_destruct(dev);
  
      ovs_mutex_unlock(&dpdk_mutex);
  }
  
  /* rte_vhost_driver_unregister() can call back destroy_device(), which will
   * try to acquire 'dpdk_mutex' and possibly 'dev->mutex'.  To avoid a
   * deadlock, none of the mutexes must be held while calling this function. */
  static int
  dpdk_vhost_driver_unregister(struct netdev_dpdk *dev OVS_UNUSED,
                               char *vhost_id)
      OVS_EXCLUDED(dpdk_mutex)
      OVS_EXCLUDED(dev->mutex)
  {
      return rte_vhost_driver_unregister(vhost_id);
  }
  
  static void
  netdev_dpdk_vhost_destruct(struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      char *vhost_id;
  
      ovs_mutex_lock(&dpdk_mutex);
  
      /* Guest becomes an orphan if still attached. */
      if (netdev_dpdk_get_vid(dev) >= 0
          && !(dev->vhost_driver_flags & RTE_VHOST_USER_CLIENT)) {
          VLOG_ERR("Removing port '%s' while vhost device still attached.",
                   netdev->name);
          VLOG_ERR("To restore connectivity after re-adding of port, VM on "
                   "socket '%s' must be restarted.", dev->vhost_id);
      }
  
      vhost_id = xstrdup(dev->vhost_id);
  
      common_destruct(dev);
  
      ovs_mutex_unlock(&dpdk_mutex);
  
      if (!vhost_id[0]) {
          goto out;
      }
  
      if (dpdk_vhost_driver_unregister(dev, vhost_id)) {
          VLOG_ERR("%s: Unable to unregister vhost driver for socket '%s'.\n",
                   netdev->name, vhost_id);
      } else if (!(dev->vhost_driver_flags & RTE_VHOST_USER_CLIENT)) {
          /* OVS server mode - remove this socket from list for deletion */
          fatal_signal_remove_file_to_unlink(vhost_id);
      }
  out:
      free(vhost_id);
  }
  
  static void
  netdev_dpdk_dealloc(struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      rte_free(dev);
  }
  
  static int
  netdev_dpdk_get_config(const struct netdev *netdev, struct smap *args)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
  
      smap_add_format(args, "requested_rx_queues", "%d", dev->requested_n_rxq);
      smap_add_format(args, "configured_rx_queues", "%d", netdev->n_rxq);
      smap_add_format(args, "requested_tx_queues", "%d", dev->requested_n_txq);
      smap_add_format(args, "configured_tx_queues", "%d", netdev->n_txq);
      smap_add_format(args, "mtu", "%d", dev->mtu);
  
      if (dev->type == DPDK_DEV_ETH) {
          smap_add_format(args, "requested_rxq_descriptors", "%d",
                          dev->requested_rxq_size);
          smap_add_format(args, "configured_rxq_descriptors", "%d",
                          dev->rxq_size);
          smap_add_format(args, "requested_txq_descriptors", "%d",
                          dev->requested_txq_size);
          smap_add_format(args, "configured_txq_descriptors", "%d",
                          dev->txq_size);
          if (dev->hw_ol_features & NETDEV_RX_CHECKSUM_OFFLOAD) {
              smap_add(args, "rx_csum_offload", "true");
          }
      }
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static struct netdev_dpdk *
  netdev_dpdk_lookup_by_port_id(dpdk_port_t port_id)
      OVS_REQUIRES(dpdk_mutex)
  {
      struct netdev_dpdk *dev;
  
      LIST_FOR_EACH (dev, list_node, &dpdk_list) {
          if (dev->port_id == port_id) {
              return dev;
          }
      }
  
      return NULL;
  }
  
  static dpdk_port_t
  netdev_dpdk_process_devargs(struct netdev_dpdk *dev,
                              const char *devargs, char **errp)
  {
      /* Get the name up to the first comma. */
      char *name = xmemdup0(devargs, strcspn(devargs, ","));
      dpdk_port_t new_port_id = DPDK_ETH_PORT_ID_INVALID;
  
      if (!rte_eth_dev_count()
              || rte_eth_dev_get_port_by_name(name, &new_port_id)
              || !rte_eth_dev_is_valid_port(new_port_id)) {
          /* Device not found in DPDK, attempt to attach it */
          if (!rte_eth_dev_attach(devargs, &new_port_id)) {
              /* Attach successful */
              dev->attached = true;
              VLOG_INFO("Device '%s' attached to DPDK", devargs);
          } else {
              /* Attach unsuccessful */
              new_port_id = DPDK_ETH_PORT_ID_INVALID;
              VLOG_WARN_BUF(errp, "Error attaching device '%s' to DPDK",
                            devargs);
          }
      }
  
      free(name);
      return new_port_id;
  }
  
  static void
  dpdk_set_rxq_config(struct netdev_dpdk *dev, const struct smap *args)
      OVS_REQUIRES(dev->mutex)
  {
      int new_n_rxq;
  
      new_n_rxq = MAX(smap_get_int(args, "n_rxq", NR_QUEUE), 1);
      if (new_n_rxq != dev->requested_n_rxq) {
          dev->requested_n_rxq = new_n_rxq;
          netdev_request_reconfigure(&dev->up);
      }
  }
  
  static void
  dpdk_process_queue_size(struct netdev *netdev, const struct smap *args,
                          const char *flag, int default_size, int *new_size)
  {
      int queue_size = smap_get_int(args, flag, default_size);
  
      if (queue_size <= 0 || queue_size > NIC_PORT_MAX_Q_SIZE
              || !is_pow2(queue_size)) {
          queue_size = default_size;
      }
  
      if (queue_size != *new_size) {
          *new_size = queue_size;
          netdev_request_reconfigure(netdev);
      }
  }
  
  static int
  netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
                         char **errp)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      bool rx_fc_en, tx_fc_en, autoneg;
      enum rte_eth_fc_mode fc_mode;
      static const enum rte_eth_fc_mode fc_mode_set[2][2] = {
          {RTE_FC_NONE,     RTE_FC_TX_PAUSE},
          {RTE_FC_RX_PAUSE, RTE_FC_FULL    }
      };
      bool rx_chksm_ofld;
      bool temp_flag;
      const char *new_devargs;
      int err = 0;
  
      ovs_mutex_lock(&dpdk_mutex);
      ovs_mutex_lock(&dev->mutex);
  
      dpdk_set_rxq_config(dev, args);
  
      dpdk_process_queue_size(netdev, args, "n_rxq_desc",
                              NIC_PORT_DEFAULT_RXQ_SIZE,
                              &dev->requested_rxq_size);
      dpdk_process_queue_size(netdev, args, "n_txq_desc",
                              NIC_PORT_DEFAULT_TXQ_SIZE,
                              &dev->requested_txq_size);
  
      new_devargs = smap_get(args, "dpdk-devargs");
  
      if (dev->devargs && strcmp(new_devargs, dev->devargs)) {
          /* The user requested a new device.  If we return error, the caller
           * will delete this netdev and try to recreate it. */
          err = EAGAIN;
          goto out;
      }
  
      /* dpdk-devargs is required for device configuration */
      if (new_devargs && new_devargs[0]) {
          /* Don't process dpdk-devargs if value is unchanged and port id
           * is valid */
          if (!(dev->devargs && !strcmp(dev->devargs, new_devargs)
                 && rte_eth_dev_is_valid_port(dev->port_id))) {
              dpdk_port_t new_port_id = netdev_dpdk_process_devargs(dev,
                                                                    new_devargs,
                                                                    errp);
              if (!rte_eth_dev_is_valid_port(new_port_id)) {
                  err = EINVAL;
              } else if (new_port_id == dev->port_id) {
                  /* Already configured, do not reconfigure again */
                  err = 0;
              } else {
                  struct netdev_dpdk *dup_dev;
  
                  dup_dev = netdev_dpdk_lookup_by_port_id(new_port_id);
                  if (dup_dev) {
                      VLOG_WARN_BUF(errp, "'%s' is trying to use device '%s' "
                                          "which is already in use by '%s'",
                                    netdev_get_name(netdev), new_devargs,
                                    netdev_get_name(&dup_dev->up));
                      err = EADDRINUSE;
                  } else {
                      int sid = rte_eth_dev_socket_id(new_port_id);
  
                      dev->requested_socket_id = sid < 0 ? SOCKET0 : sid;
                      dev->devargs = xstrdup(new_devargs);
                      dev->port_id = new_port_id;
                      netdev_request_reconfigure(&dev->up);
                      err = 0;
                  }
              }
          }
      } else {
          VLOG_WARN_BUF(errp, "'%s' is missing 'options:dpdk-devargs'. "
                              "The old 'dpdk<port_id>' names are not supported",
                        netdev_get_name(netdev));
          err = EINVAL;
      }
  
      if (err) {
          goto out;
      }
  
      rx_fc_en = smap_get_bool(args, "rx-flow-ctrl", false);
      tx_fc_en = smap_get_bool(args, "tx-flow-ctrl", false);
      autoneg = smap_get_bool(args, "flow-ctrl-autoneg", false);
  
      fc_mode = fc_mode_set[tx_fc_en][rx_fc_en];
      if (dev->fc_conf.mode != fc_mode || autoneg != dev->fc_conf.autoneg) {
          dev->fc_conf.mode = fc_mode;
          dev->fc_conf.autoneg = autoneg;
          dpdk_eth_flow_ctrl_setup(dev);
      }
  
      /* Rx checksum offload configuration */
      /* By default the Rx checksum offload is ON */
      rx_chksm_ofld = smap_get_bool(args, "rx-checksum-offload", true);
      temp_flag = (dev->hw_ol_features & NETDEV_RX_CHECKSUM_OFFLOAD)
                          != 0;
      if (temp_flag != rx_chksm_ofld) {
          dev->hw_ol_features ^= NETDEV_RX_CHECKSUM_OFFLOAD;
          dpdk_eth_checksum_offload_configure(dev);
      }
  
  out:
      ovs_mutex_unlock(&dev->mutex);
      ovs_mutex_unlock(&dpdk_mutex);
  
      return err;
  }
  
  static int
  netdev_dpdk_ring_set_config(struct netdev *netdev, const struct smap *args,
                              char **errp OVS_UNUSED)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
      dpdk_set_rxq_config(dev, args);
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_vhost_client_set_config(struct netdev *netdev,
                                      const struct smap *args,
                                      char **errp OVS_UNUSED)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      const char *path;
  
      ovs_mutex_lock(&dev->mutex);
      if (!(dev->vhost_driver_flags & RTE_VHOST_USER_CLIENT)) {
          path = smap_get(args, "vhost-server-path");
          if (path && strcmp(path, dev->vhost_id)) {
              strcpy(dev->vhost_id, path);
              netdev_request_reconfigure(netdev);
          }
      }
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_get_numa_id(const struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      return dev->socket_id;
  }
  
  /* Sets the number of tx queues for the dpdk interface. */
  static int
  netdev_dpdk_set_tx_multiq(struct netdev *netdev, unsigned int n_txq)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
  
      if (dev->requested_n_txq == n_txq) {
          goto out;
      }
  
      dev->requested_n_txq = n_txq;
      netdev_request_reconfigure(netdev);
  
  out:
      ovs_mutex_unlock(&dev->mutex);
      return 0;
  }
  
  static struct netdev_rxq *
  netdev_dpdk_rxq_alloc(void)
  {
      struct netdev_rxq_dpdk *rx = dpdk_rte_mzalloc(sizeof *rx);
  
      if (rx) {
          return &rx->up;
      }
  
      return NULL;
  }
  
  static struct netdev_rxq_dpdk *
  netdev_rxq_dpdk_cast(const struct netdev_rxq *rxq)
  {
      return CONTAINER_OF(rxq, struct netdev_rxq_dpdk, up);
  }
  
  static int
  netdev_dpdk_rxq_construct(struct netdev_rxq *rxq)
  {
      struct netdev_rxq_dpdk *rx = netdev_rxq_dpdk_cast(rxq);
      struct netdev_dpdk *dev = netdev_dpdk_cast(rxq->netdev);
  
      ovs_mutex_lock(&dev->mutex);
      rx->port_id = dev->port_id;
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static void
  netdev_dpdk_rxq_destruct(struct netdev_rxq *rxq OVS_UNUSED)
  {
  }
  
  static void
  netdev_dpdk_rxq_dealloc(struct netdev_rxq *rxq)
  {
      struct netdev_rxq_dpdk *rx = netdev_rxq_dpdk_cast(rxq);
  
      rte_free(rx);
  }
  
  /* Tries to transmit 'pkts' to txq 'qid' of device 'dev'.  Takes ownership of
   * 'pkts', even in case of failure.
   *
   * Returns the number of packets that weren't transmitted. */
  static inline int
  netdev_dpdk_eth_tx_burst(struct netdev_dpdk *dev, int qid,
                           struct rte_mbuf **pkts, int cnt)
  {
      uint32_t nb_tx = 0;
  
      while (nb_tx != cnt) {
          uint32_t ret;
  
          ret = rte_eth_tx_burst(dev->port_id, qid, pkts + nb_tx, cnt - nb_tx);
          if (!ret) {
              break;
          }
  
          nb_tx += ret;
      }
  
      if (OVS_UNLIKELY(nb_tx != cnt)) {
          /* Free buffers, which we couldn't transmit, one at a time (each
           * packet could come from a different mempool) */
          int i;
  
          for (i = nb_tx; i < cnt; i++) {
              rte_pktmbuf_free(pkts[i]);
          }
      }
  
      return cnt - nb_tx;
  }
  
  static inline bool
  netdev_dpdk_policer_pkt_handle(struct rte_meter_srtcm *meter,
                                 struct rte_mbuf *pkt, uint64_t time)
  {
      uint32_t pkt_len = rte_pktmbuf_pkt_len(pkt) - sizeof(struct ether_hdr);
  
      return rte_meter_srtcm_color_blind_check(meter, time, pkt_len) ==
                                                  e_RTE_METER_GREEN;
  }
  
  static int
  netdev_dpdk_policer_run(struct rte_meter_srtcm *meter,
                          struct rte_mbuf **pkts, int pkt_cnt)
  {
      int i = 0;
      int cnt = 0;
      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 (netdev_dpdk_policer_pkt_handle(meter, pkt, current_time)) {
              if (cnt != i) {
                  pkts[cnt] = pkt;
              }
              cnt++;
          } else {
              rte_pktmbuf_free(pkt);
          }
      }
  
      return cnt;
  }
  
  static int
  ingress_policer_run(struct ingress_policer *policer, struct rte_mbuf **pkts,
                      int pkt_cnt)
  {
      int cnt = 0;
  
      rte_spinlock_lock(&policer->policer_lock);
      cnt = netdev_dpdk_policer_run(&policer->in_policer, pkts, pkt_cnt);
      rte_spinlock_unlock(&policer->policer_lock);
  
      return cnt;
  }
  
  static bool
  is_vhost_running(struct netdev_dpdk *dev)
  {
      return (netdev_dpdk_get_vid(dev) >= 0 && dev->vhost_reconfigured);
  }
  
  static inline void
  netdev_dpdk_vhost_update_rx_size_counters(struct netdev_stats *stats,
                                            unsigned int packet_size)
  {
      /* Hard-coded search for the size bucket. */
      if (packet_size < 256) {
          if (packet_size >= 128) {
              stats->rx_128_to_255_packets++;
          } else if (packet_size <= 64) {
              stats->rx_1_to_64_packets++;
          } else {
              stats->rx_65_to_127_packets++;
          }
      } else {
          if (packet_size >= 1523) {
              stats->rx_1523_to_max_packets++;
          } else if (packet_size >= 1024) {
              stats->rx_1024_to_1522_packets++;
          } else if (packet_size < 512) {
              stats->rx_256_to_511_packets++;
          } else {
              stats->rx_512_to_1023_packets++;
          }
      }
  }
  
  static inline void
  netdev_dpdk_vhost_update_rx_counters(struct netdev_stats *stats,
                                       struct dp_packet **packets, int count,
                                       int dropped)
  {
      int i;
      unsigned int packet_size;
      struct dp_packet *packet;
  
      stats->rx_packets += count;
      stats->rx_dropped += dropped;
      for (i = 0; i < count; i++) {
          packet = packets[i];
          packet_size = dp_packet_size(packet);
  
          if (OVS_UNLIKELY(packet_size < ETH_HEADER_LEN)) {
              /* This only protects the following multicast counting from
               * too short packets, but it does not stop the packet from
               * further processing. */
              stats->rx_errors++;
              stats->rx_length_errors++;
              continue;
          }
  
          netdev_dpdk_vhost_update_rx_size_counters(stats, packet_size);
  
          struct eth_header *eh = (struct eth_header *) dp_packet_data(packet);
          if (OVS_UNLIKELY(eth_addr_is_multicast(eh->eth_dst))) {
              stats->multicast++;
          }
  
          stats->rx_bytes += packet_size;
      }
  }
  
  /*
   * The receive path for the vhost port is the TX path out from guest.
   */
  static int
  netdev_dpdk_vhost_rxq_recv(struct netdev_rxq *rxq,
                             struct dp_packet_batch *batch)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(rxq->netdev);
      int qid = rxq->queue_id;
      struct ingress_policer *policer = netdev_dpdk_get_ingress_policer(dev);
      uint16_t nb_rx = 0;
      uint16_t dropped = 0;
  
      if (OVS_UNLIKELY(!is_vhost_running(dev)
                       || !(dev->flags & NETDEV_UP))) {
          return EAGAIN;
      }
  
      nb_rx = rte_vhost_dequeue_burst(netdev_dpdk_get_vid(dev),
                                      qid * VIRTIO_QNUM + VIRTIO_TXQ,
                                      dev->dpdk_mp->mp,
                                      (struct rte_mbuf **) batch->packets,
                                      NETDEV_MAX_BURST);
      if (!nb_rx) {
          return EAGAIN;
      }
  
      if (policer) {
          dropped = nb_rx;
          nb_rx = ingress_policer_run(policer,
                                      (struct rte_mbuf **) batch->packets,
                                      nb_rx);
          dropped -= nb_rx;
      }
  
      rte_spinlock_lock(&dev->stats_lock);
      netdev_dpdk_vhost_update_rx_counters(&dev->stats, batch->packets,
                                           nb_rx, dropped);
      rte_spinlock_unlock(&dev->stats_lock);
  
      batch->count = (int) nb_rx;
      return 0;
  }
  
  static int
  netdev_dpdk_rxq_recv(struct netdev_rxq *rxq, struct dp_packet_batch *batch)
  {
      struct netdev_rxq_dpdk *rx = netdev_rxq_dpdk_cast(rxq);
      struct netdev_dpdk *dev = netdev_dpdk_cast(rxq->netdev);
      struct ingress_policer *policer = netdev_dpdk_get_ingress_policer(dev);
      int nb_rx;
      int dropped = 0;
  
      if (OVS_UNLIKELY(!(dev->flags & NETDEV_UP))) {
          return EAGAIN;
      }
  
      nb_rx = rte_eth_rx_burst(rx->port_id, rxq->queue_id,
                               (struct rte_mbuf **) batch->packets,
                               NETDEV_MAX_BURST);
      if (!nb_rx) {
          return EAGAIN;
      }
  
      if (policer) {
          dropped = nb_rx;
          nb_rx = ingress_policer_run(policer,
                                      (struct rte_mbuf **) batch->packets,
                                      nb_rx);
          dropped -= nb_rx;
      }
  
      /* Update stats to reflect dropped packets */
      if (OVS_UNLIKELY(dropped)) {
          rte_spinlock_lock(&dev->stats_lock);
          dev->stats.rx_dropped += dropped;
          rte_spinlock_unlock(&dev->stats_lock);
      }
  
      batch->count = nb_rx;
  
      return 0;
  }
  
  static inline int
  netdev_dpdk_qos_run(struct netdev_dpdk *dev, struct rte_mbuf **pkts,
                      int cnt)
  {
      struct qos_conf *qos_conf = ovsrcu_get(struct qos_conf *, &dev->qos_conf);
  
      if (qos_conf) {
          rte_spinlock_lock(&qos_conf->lock);
          cnt = qos_conf->ops->qos_run(qos_conf, pkts, cnt);
          rte_spinlock_unlock(&qos_conf->lock);
      }
  
      return cnt;
  }
  
  static int
  netdev_dpdk_filter_packet_len(struct netdev_dpdk *dev, struct rte_mbuf **pkts,
                                int pkt_cnt)
  {
      int i = 0;
      int cnt = 0;
      struct rte_mbuf *pkt;
  
      for (i = 0; i < pkt_cnt; i++) {
          pkt = pkts[i];
          if (OVS_UNLIKELY(pkt->pkt_len > dev->max_packet_len)) {
              VLOG_WARN_RL(&rl, "%s: Too big size %" PRIu32 " max_packet_len %d",
                           dev->up.name, pkt->pkt_len, dev->max_packet_len);
              rte_pktmbuf_free(pkt);
              continue;
          }
  
          if (OVS_UNLIKELY(i != cnt)) {
              pkts[cnt] = pkt;
          }
          cnt++;
      }
  
      return cnt;
  }
  
  static inline void
  netdev_dpdk_vhost_update_tx_counters(struct netdev_stats *stats,
                                       struct dp_packet **packets,
                                       int attempted,
                                       int dropped)
  {
      int i;
      int sent = attempted - dropped;
  
      stats->tx_packets += sent;
      stats->tx_dropped += dropped;
  
      for (i = 0; i < sent; i++) {
          stats->tx_bytes += dp_packet_size(packets[i]);
      }
  }
  
  static void
  __netdev_dpdk_vhost_send(struct netdev *netdev, int qid,
                           struct dp_packet **pkts, int cnt)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      struct rte_mbuf **cur_pkts = (struct rte_mbuf **) pkts;
      unsigned int total_pkts = cnt;
      unsigned int dropped = 0;
      int i, retries = 0;
  
      qid = dev->tx_q[qid % netdev->n_txq].map;
  
      if (OVS_UNLIKELY(!is_vhost_running(dev) || qid < 0
                       || !(dev->flags & NETDEV_UP))) {
          rte_spinlock_lock(&dev->stats_lock);
          dev->stats.tx_dropped+= cnt;
          rte_spinlock_unlock(&dev->stats_lock);
          goto out;
      }
  
      rte_spinlock_lock(&dev->tx_q[qid].tx_lock);
  
      cnt = netdev_dpdk_filter_packet_len(dev, cur_pkts, cnt);
      /* Check has QoS has been configured for the netdev */
      cnt = netdev_dpdk_qos_run(dev, cur_pkts, cnt);
      dropped = total_pkts - cnt;
  
      do {
          int vhost_qid = qid * VIRTIO_QNUM + VIRTIO_RXQ;
          unsigned int tx_pkts;
  
          tx_pkts = rte_vhost_enqueue_burst(netdev_dpdk_get_vid(dev),
                                            vhost_qid, cur_pkts, cnt);
          if (OVS_LIKELY(tx_pkts)) {
              /* Packets have been sent.*/
              cnt -= tx_pkts;
              /* Prepare for possible retry.*/
              cur_pkts = &cur_pkts[tx_pkts];
          } else {
              /* No packets sent - do not retry.*/
              break;
          }
      } while (cnt && (retries++ <= VHOST_ENQ_RETRY_NUM));
  
      rte_spinlock_unlock(&dev->tx_q[qid].tx_lock);
  
      rte_spinlock_lock(&dev->stats_lock);
      netdev_dpdk_vhost_update_tx_counters(&dev->stats, pkts, total_pkts,
                                           cnt + dropped);
      rte_spinlock_unlock(&dev->stats_lock);
  
  out:
      for (i = 0; i < total_pkts - dropped; i++) {
          dp_packet_delete(pkts[i]);
      }
  }
  
  /* Tx function. Transmit packets indefinitely */
  static void
  dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch)
      OVS_NO_THREAD_SAFETY_ANALYSIS
  {
  #if !defined(__CHECKER__) && !defined(_WIN32)
      const size_t PKT_ARRAY_SIZE = batch->count;
  #else
      /* Sparse or MSVC doesn't like variable length array. */
      enum { PKT_ARRAY_SIZE = NETDEV_MAX_BURST };
  #endif
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      struct rte_mbuf *pkts[PKT_ARRAY_SIZE];
      int dropped = 0;
      int newcnt = 0;
      int i;
  
      dp_packet_batch_apply_cutlen(batch);
  
      for (i = 0; i < batch->count; i++) {
          int size = dp_packet_size(batch->packets[i]);
  
          if (OVS_UNLIKELY(size > dev->max_packet_len)) {
              VLOG_WARN_RL(&rl, "Too big size %d max_packet_len %d",
                           (int) size, dev->max_packet_len);
  
              dropped++;
              continue;
          }
  
          pkts[newcnt] = rte_pktmbuf_alloc(dev->dpdk_mp->mp);
  
          if (!pkts[newcnt]) {
              dropped += batch->count - i;
              break;
          }
  
          /* We have to do a copy for now */
          memcpy(rte_pktmbuf_mtod(pkts[newcnt], void *),
                 dp_packet_data(batch->packets[i]), size);
  
          rte_pktmbuf_data_len(pkts[newcnt]) = size;
          rte_pktmbuf_pkt_len(pkts[newcnt]) = size;
  
          newcnt++;
      }
  
      if (dev->type == DPDK_DEV_VHOST) {
          __netdev_dpdk_vhost_send(netdev, qid, (struct dp_packet **) pkts,
                                   newcnt);
      } else {
          unsigned int qos_pkts = newcnt;
  
          /* Check if QoS has been configured for this netdev. */
          newcnt = netdev_dpdk_qos_run(dev, pkts, newcnt);
  
          dropped += qos_pkts - newcnt;
          dropped += netdev_dpdk_eth_tx_burst(dev, qid, pkts, newcnt);
      }
  
      if (OVS_UNLIKELY(dropped)) {
          rte_spinlock_lock(&dev->stats_lock);
          dev->stats.tx_dropped += dropped;
          rte_spinlock_unlock(&dev->stats_lock);
      }
  }
  
  static int
  netdev_dpdk_vhost_send(struct netdev *netdev, int qid,
                         struct dp_packet_batch *batch,
                         bool may_steal, bool concurrent_txq OVS_UNUSED)
  {
  
      if (OVS_UNLIKELY(!may_steal || batch->packets[0]->source != DPBUF_DPDK)) {
          dpdk_do_tx_copy(netdev, qid, batch);
          dp_packet_delete_batch(batch, may_steal);
      } else {
          dp_packet_batch_apply_cutlen(batch);
          __netdev_dpdk_vhost_send(netdev, qid, batch->packets, batch->count);
      }
      return 0;
  }
  
  static inline void
  netdev_dpdk_send__(struct netdev_dpdk *dev, int qid,
                     struct dp_packet_batch *batch, bool may_steal,
                     bool concurrent_txq)
  {
      if (OVS_UNLIKELY(!(dev->flags & NETDEV_UP))) {
          dp_packet_delete_batch(batch, may_steal);
          return;
      }
  
      if (OVS_UNLIKELY(concurrent_txq)) {
          qid = qid % dev->up.n_txq;
          rte_spinlock_lock(&dev->tx_q[qid].tx_lock);
      }
  
      if (OVS_UNLIKELY(!may_steal ||
                       batch->packets[0]->source != DPBUF_DPDK)) {
          struct netdev *netdev = &dev->up;
  
          dpdk_do_tx_copy(netdev, qid, batch);
          dp_packet_delete_batch(batch, may_steal);
      } else {
          int dropped;
          int cnt = batch->count;
          struct rte_mbuf **pkts = (struct rte_mbuf **) batch->packets;
  
          dp_packet_batch_apply_cutlen(batch);
  
          cnt = netdev_dpdk_filter_packet_len(dev, pkts, cnt);
          cnt = netdev_dpdk_qos_run(dev, pkts, cnt);
          dropped = batch->count - cnt;
  
          dropped += netdev_dpdk_eth_tx_burst(dev, qid, pkts, cnt);
  
          if (OVS_UNLIKELY(dropped)) {
              rte_spinlock_lock(&dev->stats_lock);
              dev->stats.tx_dropped += dropped;
              rte_spinlock_unlock(&dev->stats_lock);
          }
      }
  
      if (OVS_UNLIKELY(concurrent_txq)) {
          rte_spinlock_unlock(&dev->tx_q[qid].tx_lock);
      }
  }
  
  static int
  netdev_dpdk_eth_send(struct netdev *netdev, int qid,
                       struct dp_packet_batch *batch, bool may_steal,
                       bool concurrent_txq)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      netdev_dpdk_send__(dev, qid, batch, may_steal, concurrent_txq);
      return 0;
  }
  
  static int
  netdev_dpdk_set_etheraddr(struct netdev *netdev, const struct eth_addr mac)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
      if (!eth_addr_equals(dev->hwaddr, mac)) {
          dev->hwaddr = mac;
          netdev_change_seq_changed(netdev);
      }
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_get_etheraddr(const struct netdev *netdev, struct eth_addr *mac)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
      *mac = dev->hwaddr;
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_get_mtu(const struct netdev *netdev, int *mtup)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
      *mtup = dev->mtu;
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_set_mtu(struct netdev *netdev, int mtu)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      if (MTU_TO_FRAME_LEN(mtu) > NETDEV_DPDK_MAX_PKT_LEN
          || mtu < ETHER_MIN_MTU) {
          VLOG_WARN("%s: unsupported MTU %d\n", dev->up.name, mtu);
          return EINVAL;
      }
  
      ovs_mutex_lock(&dev->mutex);
      if (dev->requested_mtu != mtu) {
          dev->requested_mtu = mtu;
          netdev_request_reconfigure(netdev);
      }
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_get_carrier(const struct netdev *netdev, bool *carrier);
  
  static int
  netdev_dpdk_vhost_get_stats(const struct netdev *netdev,
                              struct netdev_stats *stats)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
  
      rte_spinlock_lock(&dev->stats_lock);
      /* Supported Stats */
      stats->rx_packets += dev->stats.rx_packets;
      stats->tx_packets += dev->stats.tx_packets;
      stats->rx_dropped = dev->stats.rx_dropped;
      stats->tx_dropped += dev->stats.tx_dropped;
      stats->multicast = dev->stats.multicast;
      stats->rx_bytes = dev->stats.rx_bytes;
      stats->tx_bytes = dev->stats.tx_bytes;
      stats->rx_errors = dev->stats.rx_errors;
      stats->rx_length_errors = dev->stats.rx_length_errors;
  
      stats->rx_1_to_64_packets = dev->stats.rx_1_to_64_packets;
      stats->rx_65_to_127_packets = dev->stats.rx_65_to_127_packets;
      stats->rx_128_to_255_packets = dev->stats.rx_128_to_255_packets;
      stats->rx_256_to_511_packets = dev->stats.rx_256_to_511_packets;
      stats->rx_512_to_1023_packets = dev->stats.rx_512_to_1023_packets;
      stats->rx_1024_to_1522_packets = dev->stats.rx_1024_to_1522_packets;
      stats->rx_1523_to_max_packets = dev->stats.rx_1523_to_max_packets;
  
      rte_spinlock_unlock(&dev->stats_lock);
  
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static void
  netdev_dpdk_convert_xstats(struct netdev_stats *stats,
                             const struct rte_eth_xstat *xstats,
                             const struct rte_eth_xstat_name *names,
                             const unsigned int size)
  {
      for (unsigned int i = 0; i < size; i++) {
          if (strcmp(XSTAT_RX_64_PACKETS, names[i].name) == 0) {
              stats->rx_1_to_64_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_65_TO_127_PACKETS, names[i].name) == 0) {
              stats->rx_65_to_127_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_128_TO_255_PACKETS, names[i].name) == 0) {
              stats->rx_128_to_255_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_256_TO_511_PACKETS, names[i].name) == 0) {
              stats->rx_256_to_511_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_512_TO_1023_PACKETS, names[i].name) == 0) {
              stats->rx_512_to_1023_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_1024_TO_1522_PACKETS, names[i].name) == 0) {
              stats->rx_1024_to_1522_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_1523_TO_MAX_PACKETS, names[i].name) == 0) {
              stats->rx_1523_to_max_packets = xstats[i].value;
          } else if (strcmp(XSTAT_TX_64_PACKETS, names[i].name) == 0) {
              stats->tx_1_to_64_packets = xstats[i].value;
          } else if (strcmp(XSTAT_TX_65_TO_127_PACKETS, names[i].name) == 0) {
              stats->tx_65_to_127_packets = xstats[i].value;
          } else if (strcmp(XSTAT_TX_128_TO_255_PACKETS, names[i].name) == 0) {
              stats->tx_128_to_255_packets = xstats[i].value;
          } else if (strcmp(XSTAT_TX_256_TO_511_PACKETS, names[i].name) == 0) {
              stats->tx_256_to_511_packets = xstats[i].value;
          } else if (strcmp(XSTAT_TX_512_TO_1023_PACKETS, names[i].name) == 0) {
              stats->tx_512_to_1023_packets = xstats[i].value;
          } else if (strcmp(XSTAT_TX_1024_TO_1522_PACKETS, names[i].name) == 0) {
              stats->tx_1024_to_1522_packets = xstats[i].value;
          } else if (strcmp(XSTAT_TX_1523_TO_MAX_PACKETS, names[i].name) == 0) {
              stats->tx_1523_to_max_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_MULTICAST_PACKETS, names[i].name) == 0) {
              stats->multicast = xstats[i].value;
          } else if (strcmp(XSTAT_TX_MULTICAST_PACKETS, names[i].name) == 0) {
              stats->tx_multicast_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_BROADCAST_PACKETS, names[i].name) == 0) {
              stats->rx_broadcast_packets = xstats[i].value;
          } else if (strcmp(XSTAT_TX_BROADCAST_PACKETS, names[i].name) == 0) {
              stats->tx_broadcast_packets = xstats[i].value;
          } else if (strcmp(XSTAT_RX_UNDERSIZED_ERRORS, names[i].name) == 0) {
              stats->rx_undersized_errors = xstats[i].value;
          } else if (strcmp(XSTAT_RX_FRAGMENTED_ERRORS, names[i].name) == 0) {
              stats->rx_fragmented_errors = xstats[i].value;
          } else if (strcmp(XSTAT_RX_JABBER_ERRORS, names[i].name) == 0) {
              stats->rx_jabber_errors = xstats[i].value;
          }
      }
  }
  
  static int
  netdev_dpdk_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      struct rte_eth_stats rte_stats;
      bool gg;
  
      netdev_dpdk_get_carrier(netdev, &gg);
      ovs_mutex_lock(&dev->mutex);
  
      struct rte_eth_xstat *rte_xstats = NULL;
      struct rte_eth_xstat_name *rte_xstats_names = NULL;
      int rte_xstats_len, rte_xstats_new_len, rte_xstats_ret;
  
      if (rte_eth_stats_get(dev->port_id, &rte_stats)) {
          VLOG_ERR("Can't get ETH statistics for port: %"PRIu8, dev->port_id);
          ovs_mutex_unlock(&dev->mutex);
          return EPROTO;
      }
  
      /* Get length of statistics */
      rte_xstats_len = rte_eth_xstats_get_names(dev->port_id, NULL, 0);
      if (rte_xstats_len < 0) {
          VLOG_WARN("Cannot get XSTATS values for port: %"PRIu8, dev->port_id);
          goto out;
      }
      /* Reserve memory for xstats names and values */
      rte_xstats_names = xcalloc(rte_xstats_len, sizeof *rte_xstats_names);
      rte_xstats = xcalloc(rte_xstats_len, sizeof *rte_xstats);
  
      /* Retreive xstats names */
      rte_xstats_new_len = rte_eth_xstats_get_names(dev->port_id,
                                                    rte_xstats_names,
                                                    rte_xstats_len);
      if (rte_xstats_new_len != rte_xstats_len) {
          VLOG_WARN("Cannot get XSTATS names for port: %"PRIu8, dev->port_id);
          goto out;
      }
      /* Retreive xstats values */
      memset(rte_xstats, 0xff, sizeof *rte_xstats * rte_xstats_len);
      rte_xstats_ret = rte_eth_xstats_get(dev->port_id, rte_xstats,
                                          rte_xstats_len);
      if (rte_xstats_ret > 0 && rte_xstats_ret <= rte_xstats_len) {
          netdev_dpdk_convert_xstats(stats, rte_xstats, rte_xstats_names,
                                     rte_xstats_len);
      } else {
          VLOG_WARN("Cannot get XSTATS values for port: %"PRIu8, dev->port_id);
      }
  
  out:
      free(rte_xstats);
      free(rte_xstats_names);
  
      stats->rx_packets = rte_stats.ipackets;
      stats->tx_packets = rte_stats.opackets;
      stats->rx_bytes = rte_stats.ibytes;
      stats->tx_bytes = rte_stats.obytes;
      stats->rx_errors = rte_stats.ierrors;
      stats->tx_errors = rte_stats.oerrors;
  
      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
       * local resource constraints in DPDK and NIC respectively. */
      stats->rx_dropped += rte_stats.rx_nombuf + rte_stats.imissed;
      stats->rx_missed_errors = rte_stats.imissed;
  
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_get_features(const struct netdev *netdev,
                           enum netdev_features *current,
                           enum netdev_features *advertised,
                           enum netdev_features *supported,
                           enum netdev_features *peer)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      struct rte_eth_link link;
  
      ovs_mutex_lock(&dev->mutex);
      link = dev->link;
      ovs_mutex_unlock(&dev->mutex);
  
      if (link.link_duplex == ETH_LINK_HALF_DUPLEX) {
          if (link.link_speed == ETH_SPEED_NUM_10M) {
              *current = NETDEV_F_10MB_HD;
          }
          if (link.link_speed == ETH_SPEED_NUM_100M) {
              *current = NETDEV_F_100MB_HD;
          }
          if (link.link_speed == ETH_SPEED_NUM_1G) {
              *current = NETDEV_F_1GB_HD;
          }
      } else if (link.link_duplex == ETH_LINK_FULL_DUPLEX) {
          if (link.link_speed == ETH_SPEED_NUM_10M) {
              *current = NETDEV_F_10MB_FD;
          }
          if (link.link_speed == ETH_SPEED_NUM_100M) {
              *current = NETDEV_F_100MB_FD;
          }
          if (link.link_speed == ETH_SPEED_NUM_1G) {
              *current = NETDEV_F_1GB_FD;
          }
          if (link.link_speed == ETH_SPEED_NUM_10G) {
              *current = NETDEV_F_10GB_FD;
          }
      }
  
      if (link.link_autoneg) {
          *current |= NETDEV_F_AUTONEG;
      }
  
      *advertised = *supported = *peer = 0;
  
      return 0;
  }
  
  static struct ingress_policer *
  netdev_dpdk_policer_construct(uint32_t rate, uint32_t burst)
  {
      struct ingress_policer *policer = NULL;
      uint64_t rate_bytes;
      uint64_t burst_bytes;
      int err = 0;
  
      policer = xmalloc(sizeof *policer);
      rte_spinlock_init(&policer->policer_lock);
  
      /* rte_meter requires bytes so convert kbits rate and burst to bytes. */
      rate_bytes = rate * 1000/8;
      burst_bytes = burst * 1000/8;
  
      policer->app_srtcm_params.cir = rate_bytes;
      policer->app_srtcm_params.cbs = burst_bytes;
      policer->app_srtcm_params.ebs = 0;
      err = rte_meter_srtcm_config(&policer->in_policer,
                                      &policer->app_srtcm_params);
      if (err) {
          VLOG_ERR("Could not create rte meter for ingress policer");
          return NULL;
      }
  
      return policer;
  }
  
  static int
  netdev_dpdk_set_policing(struct netdev* netdev, uint32_t policer_rate,
                           uint32_t policer_burst)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      struct ingress_policer *policer;
  
      /* Force to 0 if no rate specified,
       * default to 8000 kbits if burst is 0,
       * else stick with user-specified value.
       */
      policer_burst = (!policer_rate ? 0
                       : !policer_burst ? 8000
                       : policer_burst);
  
      ovs_mutex_lock(&dev->mutex);
  
      policer = ovsrcu_get_protected(struct ingress_policer *,
                                      &dev->ingress_policer);
  
      if (dev->policer_rate == policer_rate &&
          dev->policer_burst == policer_burst) {
          /* Assume that settings haven't changed since we last set them. */
          ovs_mutex_unlock(&dev->mutex);
          return 0;
      }
  
      /* Destroy any existing ingress policer for the device if one exists */
      if (policer) {
          ovsrcu_postpone(free, policer);
      }
  
      if (policer_rate != 0) {
          policer = netdev_dpdk_policer_construct(policer_rate, policer_burst);
      } else {
          policer = NULL;
      }
      ovsrcu_set(&dev->ingress_policer, policer);
      dev->policer_rate = policer_rate;
      dev->policer_burst = policer_burst;
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_get_ifindex(const struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
      /* Calculate hash from the netdev name. Ensure that ifindex is a 24-bit
       * postive integer to meet RFC 2863 recommendations.
       */
      int ifindex = hash_string(netdev->name, 0) % 0xfffffe + 1;
      ovs_mutex_unlock(&dev->mutex);
  
      return ifindex;
  }
  
  static int
  netdev_dpdk_get_carrier(const struct netdev *netdev, bool *carrier)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
      check_link_status(dev);
      *carrier = dev->link.link_status;
  
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static int
  netdev_dpdk_vhost_get_carrier(const struct netdev *netdev, bool *carrier)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
  
      ovs_mutex_lock(&dev->mutex);
  
      if (is_vhost_running(dev)) {
          *carrier = 1;
      } else {
          *carrier = 0;
      }
  
      ovs_mutex_unlock(&dev->mutex);
  
      return 0;
  }
  
  static long long int
  netdev_dpdk_get_carrier_resets(const struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      long long int carrier_resets;
  
      ovs_mutex_lock(&dev->mutex);
      carrier_resets = dev->link_reset_cnt;
      ovs_mutex_unlock(&dev->mutex);
  
      return carrier_resets;
  }
  
  static int
  netdev_dpdk_set_miimon(struct netdev *netdev OVS_UNUSED,
                         long long int interval OVS_UNUSED)
  {
      return EOPNOTSUPP;
  }
  
  static int
  netdev_dpdk_update_flags__(struct netdev_dpdk *dev,
                             enum netdev_flags off, enum netdev_flags on,
                             enum netdev_flags *old_flagsp)
      OVS_REQUIRES(dev->mutex)
  {
      if ((off | on) & ~(NETDEV_UP | NETDEV_PROMISC)) {
          return EINVAL;
      }
  
      *old_flagsp = dev->flags;
      dev->flags |= on;
      dev->flags &= ~off;
  
      if (dev->flags == *old_flagsp) {
          return 0;
      }
  
      if (dev->type == DPDK_DEV_ETH) {
          if (dev->flags & NETDEV_PROMISC) {
              rte_eth_promiscuous_enable(dev->port_id);
          }
  
          netdev_change_seq_changed(&dev->up);
      } else {
          /* If DPDK_DEV_VHOST device's NETDEV_UP flag was changed and vhost is
           * running then change netdev's change_seq to trigger link state
           * update. */
  
          if ((NETDEV_UP & ((*old_flagsp ^ on) | (*old_flagsp ^ off)))
              && is_vhost_running(dev)) {
              netdev_change_seq_changed(&dev->up);
  
              /* Clear statistics if device is getting up. */
              if (NETDEV_UP & on) {
                  rte_spinlock_lock(&dev->stats_lock);
                  memset(&dev->stats, 0, sizeof dev->stats);
                  rte_spinlock_unlock(&dev->stats_lock);
              }
          }
      }
  
      return 0;
  }
  
  static int
  netdev_dpdk_update_flags(struct netdev *netdev,
                           enum netdev_flags off, enum netdev_flags on,
                           enum netdev_flags *old_flagsp)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      int error;
  
      ovs_mutex_lock(&dev->mutex);
      error = netdev_dpdk_update_flags__(dev, off, on, old_flagsp);
      ovs_mutex_unlock(&dev->mutex);
  
      return error;
  }
  
  static int
  netdev_dpdk_get_status(const struct netdev *netdev, struct smap *args)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      struct rte_eth_dev_info dev_info;
  
      if (!rte_eth_dev_is_valid_port(dev->port_id)) {
          return ENODEV;
      }
  
      ovs_mutex_lock(&dev->mutex);
      rte_eth_dev_info_get(dev->port_id, &dev_info);
      ovs_mutex_unlock(&dev->mutex);
  
      smap_add_format(args, "port_no", "%d", dev->port_id);
      smap_add_format(args, "numa_id", "%d",
                             rte_eth_dev_socket_id(dev->port_id));
      smap_add_format(args, "driver_name", "%s", dev_info.driver_name);
      smap_add_format(args, "min_rx_bufsize", "%u", dev_info.min_rx_bufsize);
      smap_add_format(args, "max_rx_pktlen", "%u", dev->max_packet_len);
      smap_add_format(args, "max_rx_queues", "%u", dev_info.max_rx_queues);
      smap_add_format(args, "max_tx_queues", "%u", dev_info.max_tx_queues);
      smap_add_format(args, "max_mac_addrs", "%u", dev_info.max_mac_addrs);
      smap_add_format(args, "max_hash_mac_addrs", "%u",
                             dev_info.max_hash_mac_addrs);
      smap_add_format(args, "max_vfs", "%u", dev_info.max_vfs);
      smap_add_format(args, "max_vmdq_pools", "%u", dev_info.max_vmdq_pools);
  
      if (dev_info.pci_dev) {
          smap_add_format(args, "pci-vendor_id", "0x%u",
                          dev_info.pci_dev->id.vendor_id);
          smap_add_format(args, "pci-device_id", "0x%x",
                          dev_info.pci_dev->id.device_id);
      }
  
      return 0;
  }
  
  static void
  netdev_dpdk_set_admin_state__(struct netdev_dpdk *dev, bool admin_state)
      OVS_REQUIRES(dev->mutex)
  {
      enum netdev_flags old_flags;
  
      if (admin_state) {
          netdev_dpdk_update_flags__(dev, 0, NETDEV_UP, &old_flags);
      } else {
          netdev_dpdk_update_flags__(dev, NETDEV_UP, 0, &old_flags);
      }
  }
  
  static void
  netdev_dpdk_set_admin_state(struct unixctl_conn *conn, int argc,
                              const char *argv[], void *aux OVS_UNUSED)
  {
      bool up;
  
      if (!strcasecmp(argv[argc - 1], "up")) {
          up = true;
      } else if ( !strcasecmp(argv[argc - 1], "down")) {
          up = false;
      } else {
          unixctl_command_reply_error(conn, "Invalid Admin State");
          return;
      }
  
      if (argc > 2) {
          struct netdev *netdev = netdev_from_name(argv[1]);
          if (netdev && is_dpdk_class(netdev->netdev_class)) {
              struct netdev_dpdk *dpdk_dev = netdev_dpdk_cast(netdev);
  
              ovs_mutex_lock(&dpdk_dev->mutex);
              netdev_dpdk_set_admin_state__(dpdk_dev, up);
              ovs_mutex_unlock(&dpdk_dev->mutex);
  
              netdev_close(netdev);
          } else {
              unixctl_command_reply_error(conn, "Not a DPDK Interface");
              netdev_close(netdev);
              return;
          }
      } else {
          struct netdev_dpdk *netdev;
  
          ovs_mutex_lock(&dpdk_mutex);
          LIST_FOR_EACH (netdev, list_node, &dpdk_list) {
              ovs_mutex_lock(&netdev->mutex);
              netdev_dpdk_set_admin_state__(netdev, up);
              ovs_mutex_unlock(&netdev->mutex);
          }
          ovs_mutex_unlock(&dpdk_mutex);
      }
      unixctl_command_reply(conn, "OK");
  }
  
  /*
   * Set virtqueue flags so that we do not receive interrupts.
   */
  static void
  set_irq_status(int vid)
  {
      uint32_t i;
      uint64_t idx;
  
      for (i = 0; i < rte_vhost_get_queue_num(vid); i++) {
          idx = i * VIRTIO_QNUM;
          rte_vhost_enable_guest_notification(vid, idx + VIRTIO_RXQ, 0);
          rte_vhost_enable_guest_notification(vid, idx + VIRTIO_TXQ, 0);
      }
  }
  
  /*
   * Fixes mapping for vhost-user tx queues. Must be called after each
   * enabling/disabling of queues and n_txq modifications.
   */
  static void
  netdev_dpdk_remap_txqs(struct netdev_dpdk *dev)
      OVS_REQUIRES(dev->mutex)
  {
      int *enabled_queues, n_enabled = 0;
      int i, k, total_txqs = dev->up.n_txq;
  
      enabled_queues = xcalloc(total_txqs, sizeof *enabled_queues);
  
      for (i = 0; i < total_txqs; i++) {
          /* Enabled queues always mapped to themselves. */
          if (dev->tx_q[i].map == i) {
              enabled_queues[n_enabled++] = i;
          }
      }
  
      if (n_enabled == 0 && total_txqs != 0) {
          enabled_queues[0] = OVS_VHOST_QUEUE_DISABLED;
          n_enabled = 1;
      }
  
      k = 0;
      for (i = 0; i < total_txqs; i++) {
          if (dev->tx_q[i].map != i) {
              dev->tx_q[i].map = enabled_queues[k];
              k = (k + 1) % n_enabled;
          }
      }
  
      VLOG_DBG("TX queue mapping for %s\n", dev->vhost_id);
      for (i = 0; i < total_txqs; i++) {
          VLOG_DBG("%2d --> %2d", i, dev->tx_q[i].map);
      }
  
      free(enabled_queues);
  }
  
  /*
   * A new virtio-net device is added to a vhost port.
   */
  static int
  new_device(int vid)
  {
      struct netdev_dpdk *dev;
      bool exists = false;
      int newnode = 0;
      char ifname[IF_NAME_SZ];
  
      rte_vhost_get_ifname(vid, ifname, sizeof ifname);
  
      ovs_mutex_lock(&dpdk_mutex);
      /* Add device to the vhost port with the same name as that passed down. */
      LIST_FOR_EACH(dev, list_node, &dpdk_list) {
          ovs_mutex_lock(&dev->mutex);
          if (strncmp(ifname, dev->vhost_id, IF_NAME_SZ) == 0) {
              uint32_t qp_num = rte_vhost_get_queue_num(vid);
  
              /* Get NUMA information */
              newnode = rte_vhost_get_numa_node(vid);
              if (newnode == -1) {
  #ifdef VHOST_NUMA
                  VLOG_INFO("Error getting NUMA info for vHost Device '%s'",
                            ifname);
  #endif
                  newnode = dev->socket_id;
              }
  
              if (dev->requested_n_txq != qp_num
                  || dev->requested_n_rxq != qp_num
                  || dev->requested_socket_id != newnode) {
                  dev->requested_socket_id = newnode;
                  dev->requested_n_rxq = qp_num;
                  dev->requested_n_txq = qp_num;
                  netdev_request_reconfigure(&dev->up);
              } else {
                  /* Reconfiguration not required. */
                  dev->vhost_reconfigured = true;
              }
  
              ovsrcu_index_set(&dev->vid, vid);
              exists = true;
  
              /* Disable notifications. */
              set_irq_status(vid);
              netdev_change_seq_changed(&dev->up);
              ovs_mutex_unlock(&dev->mutex);
              break;
          }
          ovs_mutex_unlock(&dev->mutex);
      }
      ovs_mutex_unlock(&dpdk_mutex);
  
      if (!exists) {
          VLOG_INFO("vHost Device '%s' can't be added - name not found", ifname);
  
          return -1;
      }
  
      VLOG_INFO("vHost Device '%s' has been added on numa node %i",
                ifname, newnode);
  
      return 0;
  }
  
  /* Clears mapping for all available queues of vhost interface. */
  static void
  netdev_dpdk_txq_map_clear(struct netdev_dpdk *dev)
      OVS_REQUIRES(dev->mutex)
  {
      int i;
  
      for (i = 0; i < dev->up.n_txq; i++) {
          dev->tx_q[i].map = OVS_VHOST_QUEUE_MAP_UNKNOWN;
      }
  }
  
  /*
   * Remove a virtio-net device from the specific vhost port.  Use dev->remove
   * flag to stop any more packets from being sent or received to/from a VM and
   * ensure all currently queued packets have been sent/received before removing
   *  the device.
   */
  static void
  destroy_device(int vid)
  {
      struct netdev_dpdk *dev;
      bool exists = false;
      char ifname[IF_NAME_SZ];
  
      rte_vhost_get_ifname(vid, ifname, sizeof ifname);
  
      ovs_mutex_lock(&dpdk_mutex);
      LIST_FOR_EACH (dev, list_node, &dpdk_list) {
          if (netdev_dpdk_get_vid(dev) == vid) {
  
              ovs_mutex_lock(&dev->mutex);
              dev->vhost_reconfigured = false;
              ovsrcu_index_set(&dev->vid, -1);
              netdev_dpdk_txq_map_clear(dev);
  
              netdev_change_seq_changed(&dev->up);
              ovs_mutex_unlock(&dev->mutex);
              exists = true;
              break;
          }
      }
  
      ovs_mutex_unlock(&dpdk_mutex);
  
      if (exists) {
          /*
           * Wait for other threads to quiesce after setting the 'virtio_dev'
           * to NULL, before returning.
           */
          ovsrcu_synchronize();
          /*
           * As call to ovsrcu_synchronize() will end the quiescent state,
           * put thread back into quiescent state before returning.
           */
          ovsrcu_quiesce_start();
          VLOG_INFO("vHost Device '%s' has been removed", ifname);
      } else {
          VLOG_INFO("vHost Device '%s' not found", ifname);
      }
  }
  
  static int
  vring_state_changed(int vid, uint16_t queue_id, int enable)
  {
      struct netdev_dpdk *dev;
      bool exists = false;
      int qid = queue_id / VIRTIO_QNUM;
      char ifname[IF_NAME_SZ];
  
      rte_vhost_get_ifname(vid, ifname, sizeof ifname);
  
      if (queue_id % VIRTIO_QNUM == VIRTIO_TXQ) {
          return 0;
      }
  
      ovs_mutex_lock(&dpdk_mutex);
      LIST_FOR_EACH (dev, list_node, &dpdk_list) {
          ovs_mutex_lock(&dev->mutex);
          if (strncmp(ifname, dev->vhost_id, IF_NAME_SZ) == 0) {
              if (enable) {
                  dev->tx_q[qid].map = qid;
              } else {
                  dev->tx_q[qid].map = OVS_VHOST_QUEUE_DISABLED;
              }
              netdev_dpdk_remap_txqs(dev);
              exists = true;
              ovs_mutex_unlock(&dev->mutex);
              break;
          }
          ovs_mutex_unlock(&dev->mutex);
      }
      ovs_mutex_unlock(&dpdk_mutex);
  
      if (exists) {
          VLOG_INFO("State of queue %d ( tx_qid %d ) of vhost device '%s'"
                    "changed to \'%s\'", queue_id, qid, ifname,
                    (enable == 1) ? "enabled" : "disabled");
      } else {
          VLOG_INFO("vHost Device '%s' not found", ifname);
          return -1;
      }
  
      return 0;
  }
  
  int
  netdev_dpdk_get_vid(const struct netdev_dpdk *dev)
  {
      return ovsrcu_index_get(&dev->vid);
  }
  
  struct ingress_policer *
  netdev_dpdk_get_ingress_policer(const struct netdev_dpdk *dev)
  {
      return ovsrcu_get(struct ingress_policer *, &dev->ingress_policer);
  }
  
  /*
   * These callbacks allow virtio-net devices to be added to vhost ports when
   * configuration has been fully complete.
   */
  static const struct virtio_net_device_ops virtio_net_device_ops =
  {
      .new_device =  new_device,
      .destroy_device = destroy_device,
      .vring_state_changed = vring_state_changed
  };
  
  static void *
  start_vhost_loop(void *dummy OVS_UNUSED)
  {
       pthread_detach(pthread_self());
       /* Put the vhost thread into quiescent state. */
       ovsrcu_quiesce_start();
       rte_vhost_driver_session_start();
       return NULL;
  }
  
  static int
  netdev_dpdk_class_init(void)
  {
      static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
  
      /* This function can be called for different classes.  The initialization
       * needs to be done only once */
      if (ovsthread_once_start(&once)) {
          ovs_thread_create("dpdk_watchdog", dpdk_watchdog, NULL);
          unixctl_command_register("netdev-dpdk/set-admin-state",
                                   "[netdev] up|down", 1, 2,
                                   netdev_dpdk_set_admin_state, NULL);
  
          ovsthread_once_done(&once);
      }
  
      return 0;
  }
  
  static int
  netdev_dpdk_vhost_class_init(void)
  {
      static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
  
      /* This function can be called for different classes.  The initialization
       * needs to be done only once */
      if (ovsthread_once_start(&once)) {
          rte_vhost_driver_callback_register(&virtio_net_device_ops);
          rte_vhost_feature_disable(1ULL << VIRTIO_NET_F_HOST_TSO4
                                    | 1ULL << VIRTIO_NET_F_HOST_TSO6
                                    | 1ULL << VIRTIO_NET_F_CSUM);
          ovs_thread_create("vhost_thread", start_vhost_loop, NULL);
  
          ovsthread_once_done(&once);
      }
  
      return 0;
  }
  
  /* Client Rings */
  
  static int
  dpdk_ring_create(const char dev_name[], unsigned int port_no,
                   dpdk_port_t *eth_port_id)
  {
      struct dpdk_ring *ring_pair;
      char *ring_name;
      int port_id;
  
      ring_pair = dpdk_rte_mzalloc(sizeof *ring_pair);
      if (!ring_pair) {
          return ENOMEM;
      }
  
      /* XXX: Add support for multiquque ring. */
      ring_name = xasprintf("%s_tx", dev_name);
  
      /* Create single producer tx ring, netdev does explicit locking. */
      ring_pair->cring_tx = rte_ring_create(ring_name, DPDK_RING_SIZE, SOCKET0,
                                          RING_F_SP_ENQ);
      free(ring_name);
      if (ring_pair->cring_tx == NULL) {
          rte_free(ring_pair);
          return ENOMEM;
      }
  
      ring_name = xasprintf("%s_rx", dev_name);
  
      /* Create single consumer rx ring, netdev does explicit locking. */
      ring_pair->cring_rx = rte_ring_create(ring_name, DPDK_RING_SIZE, SOCKET0,
                                          RING_F_SC_DEQ);
      free(ring_name);
      if (ring_pair->cring_rx == NULL) {
          rte_free(ring_pair);
          return ENOMEM;
      }
  
      port_id = rte_eth_from_rings(dev_name, &ring_pair->cring_rx, 1,
                                   &ring_pair->cring_tx, 1, SOCKET0);
  
      if (port_id < 0) {
          rte_free(ring_pair);
          return ENODEV;
      }
  
      ring_pair->user_port_id = port_no;
      ring_pair->eth_port_id = port_id;
      *eth_port_id = port_id;
  
      ovs_list_push_back(&dpdk_ring_list, &ring_pair->list_node);
  
      return 0;
  }
  
  static int
  dpdk_ring_open(const char dev_name[], dpdk_port_t *eth_port_id)
      OVS_REQUIRES(dpdk_mutex)
  {
      struct dpdk_ring *ring_pair;
      unsigned int port_no;
      int err = 0;
  
      /* Names always start with "dpdkr" */
      err = dpdk_dev_parse_name(dev_name, "dpdkr", &port_no);
      if (err) {
          return err;
      }
  
      /* Look through our list to find the device */
      LIST_FOR_EACH (ring_pair, list_node, &dpdk_ring_list) {
           if (ring_pair->user_port_id == port_no) {
              VLOG_INFO("Found dpdk ring device %s:", dev_name);
              /* Really all that is needed */
              *eth_port_id = ring_pair->eth_port_id;
              return 0;
           }
      }
      /* Need to create the device rings */
      return dpdk_ring_create(dev_name, port_no, eth_port_id);
  }
  
  static int
  netdev_dpdk_ring_send(struct netdev *netdev, int qid,
                        struct dp_packet_batch *batch, bool may_steal,
                        bool concurrent_txq)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      unsigned i;
  
      /* When using 'dpdkr' and sending to a DPDK ring, we want to ensure that
       * the rss hash field is clear. This is because the same mbuf may be
       * modified by the consumer of the ring and return into the datapath
       * without recalculating the RSS hash. */
      for (i = 0; i < batch->count; i++) {
          dp_packet_rss_invalidate(batch->packets[i]);
      }
  
      netdev_dpdk_send__(dev, qid, batch, may_steal, concurrent_txq);
      return 0;
  }
  
  static int
  netdev_dpdk_ring_construct(struct netdev *netdev)
  {
      dpdk_port_t port_no = 0;
      int err = 0;
  
      ovs_mutex_lock(&dpdk_mutex);
  
      err = dpdk_ring_open(netdev->name, &port_no);
      if (err) {
          goto unlock_dpdk;
      }
  
      err = common_construct(netdev, port_no, DPDK_DEV_ETH,
                             rte_eth_dev_socket_id(port_no));
  unlock_dpdk:
      ovs_mutex_unlock(&dpdk_mutex);
      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;
      rte_spinlock_init(&conf->lock);
  }
  
  /*
   * 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 (!strcmp(name, ops->qos_name)) {
              return ops;
          }
      }
      return NULL;
  }
  
  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 *dev = netdev_dpdk_cast(netdev);
      struct qos_conf *qos_conf;
      int error = 0;
  
      ovs_mutex_lock(&dev->mutex);
      qos_conf = ovsrcu_get_protected(struct qos_conf *, &dev->qos_conf);
      if (qos_conf) {
          *typep = qos_conf->ops->qos_name;
          error = (qos_conf->ops->qos_get
                   ? qos_conf->ops->qos_get(qos_conf, details): 0);
      } else {
          /* No QoS configuration set, return an empty string */
          *typep = "";
      }
      ovs_mutex_unlock(&dev->mutex);
  
      return error;
  }
  
  static int
  netdev_dpdk_set_qos(struct netdev *netdev, const char *type,
                      const struct smap *details)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      const struct dpdk_qos_ops *new_ops = NULL;
      struct qos_conf *qos_conf, *new_qos_conf = NULL;
      int error = 0;
  
      ovs_mutex_lock(&dev->mutex);
  
      qos_conf = ovsrcu_get_protected(struct qos_conf *, &dev->qos_conf);
  
      new_ops = qos_lookup_name(type);
  
      if (!new_ops || !new_ops->qos_construct) {
          new_qos_conf = NULL;
          if (type && type[0]) {
              error = EOPNOTSUPP;
          }
      } else if (qos_conf && qos_conf->ops == new_ops
                 && qos_conf->ops->qos_is_equal(qos_conf, details)) {
          new_qos_conf = qos_conf;
      } else {
          error = new_ops->qos_construct(details, &new_qos_conf);
      }
  
      if (error) {
          VLOG_ERR("Failed to set QoS type %s on port %s: %s",
                   type, netdev->name, rte_strerror(error));
      }
  
      if (new_qos_conf != qos_conf) {
          ovsrcu_set(&dev->qos_conf, new_qos_conf);
          if (qos_conf) {
              ovsrcu_postpone(qos_conf->ops->qos_destruct, qos_conf);
          }
      }
  
      ovs_mutex_unlock(&dev->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 egress_meter;
  };
  
  static void
  egress_policer_details_to_param(const struct smap *details,
                                  struct rte_meter_srtcm_params *params)
  {
      memset(params, 0, sizeof *params);
      params->cir = smap_get_ullong(details, "cir", 0);
      params->cbs = smap_get_ullong(details, "cbs", 0);
      params->ebs = 0;
  }
  
  static int
  egress_policer_qos_construct(const struct smap *details,
                               struct qos_conf **conf)
  {
      struct egress_policer *policer;
      int err = 0;
  
      policer = xmalloc(sizeof *policer);
      qos_conf_init(&policer->qos_conf, &egress_policer_ops);
      egress_policer_details_to_param(details, &policer->app_srtcm_params);
      err = rte_meter_srtcm_config(&policer->egress_meter,
                                   &policer->app_srtcm_params);
      if (!err) {
          *conf = &policer->qos_conf;
      } else {
          free(policer);
          *conf = NULL;
          err = -err;
      }
  
      return err;
  }
  
  static void
  egress_policer_qos_destruct(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 qos_conf *conf, struct smap *details)
  {
      struct egress_policer *policer =
          CONTAINER_OF(conf, struct egress_policer, qos_conf);
  
      smap_add_format(details, "cir", "%"PRIu64, policer->app_srtcm_params.cir);
      smap_add_format(details, "cbs", "%"PRIu64, policer->app_srtcm_params.cbs);
  
      return 0;
  }
  
  static bool
  egress_policer_qos_is_equal(const struct qos_conf *conf,
                              const struct smap *details)
  {
      struct egress_policer *policer =
          CONTAINER_OF(conf, struct egress_policer, qos_conf);
      struct rte_meter_srtcm_params params;
  
      egress_policer_details_to_param(details, &params);
  
      return !memcmp(&params, &policer->app_srtcm_params, sizeof params);
  }
  
  static int
  egress_policer_run(struct qos_conf *conf, struct rte_mbuf **pkts, int pkt_cnt)
  {
      int cnt = 0;
      struct egress_policer *policer =
          CONTAINER_OF(conf, struct egress_policer, qos_conf);
  
      cnt = netdev_dpdk_policer_run(&policer->egress_meter, pkts, pkt_cnt);
  
      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_is_equal,
      egress_policer_run
  };
  
  static int
  netdev_dpdk_reconfigure(struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      int err = 0;
  
      ovs_mutex_lock(&dev->mutex);
  
      if (netdev->n_txq == dev->requested_n_txq
          && netdev->n_rxq == dev->requested_n_rxq
          && dev->mtu == dev->requested_mtu
          && dev->rxq_size == dev->requested_rxq_size
          && dev->txq_size == dev->requested_txq_size
          && dev->socket_id == dev->requested_socket_id) {
          /* Reconfiguration is unnecessary */
  
          goto out;
      }
  
      rte_eth_dev_stop(dev->port_id);
  
      if (dev->mtu != dev->requested_mtu
          || dev->socket_id != dev->requested_socket_id) {
          err = netdev_dpdk_mempool_configure(dev);
          if (err) {
              goto out;
          }
      }
  
      netdev->n_txq = dev->requested_n_txq;
      netdev->n_rxq = dev->requested_n_rxq;
  
      dev->rxq_size = dev->requested_rxq_size;
      dev->txq_size = dev->requested_txq_size;
  
      rte_free(dev->tx_q);
      err = dpdk_eth_dev_init(dev);
      dev->tx_q = netdev_dpdk_alloc_txq(netdev->n_txq);
      if (!dev->tx_q) {
          err = ENOMEM;
      }
  
      netdev_change_seq_changed(netdev);
  
  out:
      ovs_mutex_unlock(&dev->mutex);
      return err;
  }
  
  static int
  dpdk_vhost_reconfigure_helper(struct netdev_dpdk *dev)
      OVS_REQUIRES(dev->mutex)
  {
      dev->up.n_txq = dev->requested_n_txq;
      dev->up.n_rxq = dev->requested_n_rxq;
      int err;
  
      /* Enable TX queue 0 by default if it wasn't disabled. */
      if (dev->tx_q[0].map == OVS_VHOST_QUEUE_MAP_UNKNOWN) {
          dev->tx_q[0].map = 0;
      }
  
      netdev_dpdk_remap_txqs(dev);
  
      if (dev->requested_socket_id != dev->socket_id
          || dev->requested_mtu != dev->mtu) {
          err = netdev_dpdk_mempool_configure(dev);
          if (err) {
              return err;
          } else {
              netdev_change_seq_changed(&dev->up);
          }
      }
  
      if (netdev_dpdk_get_vid(dev) >= 0) {
          dev->vhost_reconfigured = true;
      }
  
      return 0;
  }
  
  static int
  netdev_dpdk_vhost_reconfigure(struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      int err;
  
      ovs_mutex_lock(&dev->mutex);
      err = dpdk_vhost_reconfigure_helper(dev);
      ovs_mutex_unlock(&dev->mutex);
  
      return err;
  }
  
  static int
  netdev_dpdk_vhost_client_reconfigure(struct netdev *netdev)
  {
      struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
      int err;
  
      ovs_mutex_lock(&dev->mutex);
  
      /* Configure vHost client mode if requested and if the following criteria
       * are met:
       *  1. Device hasn't been registered yet.
       *  2. A path has been specified.
       */
      if (!(dev->vhost_driver_flags & RTE_VHOST_USER_CLIENT)
              && strlen(dev->vhost_id)) {
          /* Register client-mode device */
          err = rte_vhost_driver_register(dev->vhost_id,
                                          RTE_VHOST_USER_CLIENT);
          if (err) {
              VLOG_ERR("vhost-user device setup failure for device %s\n",
                       dev->vhost_id);
              goto unlock;
          } else {
              /* Configuration successful */
              dev->vhost_driver_flags |= RTE_VHOST_USER_CLIENT;
              VLOG_INFO("vHost User device '%s' created in 'client' mode, "
                        "using client socket '%s'",
                        dev->up.name, dev->vhost_id);
          }
      }
  
      err = dpdk_vhost_reconfigure_helper(dev);
  
  unlock:
      ovs_mutex_unlock(&dev->mutex);
  
      return err;
  }
  
  #define NETDEV_DPDK_CLASS(NAME, INIT, CONSTRUCT, DESTRUCT,    \
                            SET_CONFIG, SET_TX_MULTIQ, SEND,    \
                            GET_CARRIER, GET_STATS,             \
                            GET_FEATURES, GET_STATUS,           \
                            RECONFIGURE, RXQ_RECV)              \
  {                                                             \
      NAME,                                                     \
      true,                       /* is_pmd */                  \
      INIT,                       /* init */                    \
      NULL,                       /* netdev_dpdk_run */         \
      NULL,                       /* netdev_dpdk_wait */        \
                                                                \
      netdev_dpdk_alloc,                                        \
      CONSTRUCT,                                                \
      DESTRUCT,                                                 \
      netdev_dpdk_dealloc,                                      \
      netdev_dpdk_get_config,                                   \
      SET_CONFIG,                                               \
      NULL,                       /* get_tunnel_config */       \
      NULL,                       /* build header */            \
      NULL,                       /* push header */             \
      NULL,                       /* pop header */              \
      netdev_dpdk_get_numa_id,    /* get_numa_id */             \
      SET_TX_MULTIQ,                                            \
                                                                \
      SEND,                       /* send */                    \
      NULL,                       /* send_wait */               \
                                                                \
      netdev_dpdk_set_etheraddr,                                \
      netdev_dpdk_get_etheraddr,                                \
      netdev_dpdk_get_mtu,                                      \
      netdev_dpdk_set_mtu,                                      \
      netdev_dpdk_get_ifindex,                                  \
      GET_CARRIER,                                              \
      netdev_dpdk_get_carrier_resets,                           \
      netdev_dpdk_set_miimon,                                   \
      GET_STATS,                                                \
      GET_FEATURES,                                             \
      NULL,                       /* set_advertisements */      \
                                                                \
      netdev_dpdk_set_policing,                                 \
      netdev_dpdk_get_qos_types,                                \
      NULL,                       /* get_qos_capabilities */    \
      netdev_dpdk_get_qos,                                      \
      netdev_dpdk_set_qos,                                      \
      NULL,                       /* get_queue */               \
      NULL,                       /* set_queue */               \
      NULL,                       /* delete_queue */            \
      NULL,                       /* get_queue_stats */         \
      NULL,                       /* queue_dump_start */        \
      NULL,                       /* queue_dump_next */         \
      NULL,                       /* queue_dump_done */         \
      NULL,                       /* dump_queue_stats */        \
                                                                \
      NULL,                       /* set_in4 */                 \
      NULL,                       /* get_addr_list */           \
      NULL,                       /* add_router */              \
      NULL,                       /* get_next_hop */            \
      GET_STATUS,                                               \
      NULL,                       /* arp_lookup */              \
                                                                \
      netdev_dpdk_update_flags,                                 \
      RECONFIGURE,                                              \
                                                                \
      netdev_dpdk_rxq_alloc,                                    \
      netdev_dpdk_rxq_construct,                                \
      netdev_dpdk_rxq_destruct,                                 \
      netdev_dpdk_rxq_dealloc,                                  \
      RXQ_RECV,                                                 \
      NULL,                       /* rx_wait */                 \
      NULL,                       /* rxq_drain */               \
  }
  
  static const struct netdev_class dpdk_class =
      NETDEV_DPDK_CLASS(
          "dpdk",
          netdev_dpdk_class_init,
          netdev_dpdk_construct,
          netdev_dpdk_destruct,
          netdev_dpdk_set_config,
          netdev_dpdk_set_tx_multiq,
          netdev_dpdk_eth_send,
          netdev_dpdk_get_carrier,
          netdev_dpdk_get_stats,
          netdev_dpdk_get_features,
          netdev_dpdk_get_status,
          netdev_dpdk_reconfigure,
          netdev_dpdk_rxq_recv);
  
  static const struct netdev_class dpdk_ring_class =
      NETDEV_DPDK_CLASS(
          "dpdkr",
          netdev_dpdk_class_init,
          netdev_dpdk_ring_construct,
          netdev_dpdk_destruct,
          netdev_dpdk_ring_set_config,
          netdev_dpdk_set_tx_multiq,
          netdev_dpdk_ring_send,
          netdev_dpdk_get_carrier,
          netdev_dpdk_get_stats,
          netdev_dpdk_get_features,
          netdev_dpdk_get_status,
          netdev_dpdk_reconfigure,
          netdev_dpdk_rxq_recv);
  
  static const struct netdev_class dpdk_vhost_class =
      NETDEV_DPDK_CLASS(
          "dpdkvhostuser",
          netdev_dpdk_vhost_class_init,
          netdev_dpdk_vhost_construct,
          netdev_dpdk_vhost_destruct,
          NULL,
          NULL,
          netdev_dpdk_vhost_send,
          netdev_dpdk_vhost_get_carrier,
          netdev_dpdk_vhost_get_stats,
          NULL,
          NULL,
          netdev_dpdk_vhost_reconfigure,
          netdev_dpdk_vhost_rxq_recv);
  static const struct netdev_class dpdk_vhost_client_class =
      NETDEV_DPDK_CLASS(
          "dpdkvhostuserclient",
          netdev_dpdk_vhost_class_init,
          netdev_dpdk_vhost_client_construct,
          netdev_dpdk_vhost_destruct,
          netdev_dpdk_vhost_client_set_config,
          NULL,
          netdev_dpdk_vhost_send,
          netdev_dpdk_vhost_get_carrier,
          netdev_dpdk_vhost_get_stats,
          NULL,
          NULL,
          netdev_dpdk_vhost_client_reconfigure,
          netdev_dpdk_vhost_rxq_recv);
  
  void
  netdev_dpdk_register(void)
  {
      netdev_register_provider(&dpdk_class);
      netdev_register_provider(&dpdk_ring_class);
      netdev_register_provider(&dpdk_vhost_class);
      netdev_register_provider(&dpdk_vhost_client_class);
  }
  