import 15.2.0 Octopus source

[ceph.git] / ceph / src / seastar / dpdk / drivers / net / netvsc / hn_ethdev.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016-2018 Microsoft Corporation
 * Copyright(c) 2013-2016 Brocade Communications Systems, Inc.
 * All rights reserved.
 */

#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>

#include <rte_ethdev.h>
#include <rte_memcpy.h>
#include <rte_string_fns.h>
#include <rte_memzone.h>
#include <rte_devargs.h>
#include <rte_malloc.h>
#include <rte_kvargs.h>
#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_ether.h>
#include <rte_ethdev_driver.h>
#include <rte_cycles.h>
#include <rte_errno.h>
#include <rte_memory.h>
#include <rte_eal.h>
#include <rte_dev.h>
#include <rte_bus_vmbus.h>

#include "hn_logs.h"
#include "hn_var.h"
#include "hn_rndis.h"
#include "hn_nvs.h"
#include "ndis.h"

#define HN_TX_OFFLOAD_CAPS (DEV_TX_OFFLOAD_IPV4_CKSUM | \
                            DEV_TX_OFFLOAD_TCP_CKSUM  | \
                            DEV_TX_OFFLOAD_UDP_CKSUM  | \
                            DEV_TX_OFFLOAD_TCP_TSO    | \
                            DEV_TX_OFFLOAD_MULTI_SEGS | \
                            DEV_TX_OFFLOAD_VLAN_INSERT)

#define HN_RX_OFFLOAD_CAPS (DEV_RX_OFFLOAD_CHECKSUM | \
                            DEV_RX_OFFLOAD_VLAN_STRIP)

int hn_logtype_init;
int hn_logtype_driver;

struct hn_xstats_name_off {
        char name[RTE_ETH_XSTATS_NAME_SIZE];
        unsigned int offset;
};

static const struct hn_xstats_name_off hn_stat_strings[] = {
        { "good_packets",           offsetof(struct hn_stats, packets) },
        { "good_bytes",             offsetof(struct hn_stats, bytes) },
        { "errors",                 offsetof(struct hn_stats, errors) },
        { "ring full",              offsetof(struct hn_stats, ring_full) },
        { "multicast_packets",      offsetof(struct hn_stats, multicast) },
        { "broadcast_packets",      offsetof(struct hn_stats, broadcast) },
        { "undersize_packets",      offsetof(struct hn_stats, size_bins[0]) },
        { "size_64_packets",        offsetof(struct hn_stats, size_bins[1]) },
        { "size_65_127_packets",    offsetof(struct hn_stats, size_bins[2]) },
        { "size_128_255_packets",   offsetof(struct hn_stats, size_bins[3]) },
        { "size_256_511_packets",   offsetof(struct hn_stats, size_bins[4]) },
        { "size_512_1023_packets",  offsetof(struct hn_stats, size_bins[5]) },
        { "size_1024_1518_packets", offsetof(struct hn_stats, size_bins[6]) },
        { "size_1519_max_packets",  offsetof(struct hn_stats, size_bins[7]) },
};

static struct rte_eth_dev *
eth_dev_vmbus_allocate(struct rte_vmbus_device *dev, size_t private_data_size)
{
        struct rte_eth_dev *eth_dev;
        const char *name;

        if (!dev)
                return NULL;

        name = dev->device.name;

        if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
                eth_dev = rte_eth_dev_allocate(name);
                if (!eth_dev) {
                        PMD_DRV_LOG(NOTICE, "can not allocate rte ethdev");
                        return NULL;
                }

                if (private_data_size) {
                        eth_dev->data->dev_private =
                                rte_zmalloc_socket(name, private_data_size,
                                                     RTE_CACHE_LINE_SIZE, dev->device.numa_node);
                        if (!eth_dev->data->dev_private) {
                                PMD_DRV_LOG(NOTICE, "can not allocate driver data");
                                rte_eth_dev_release_port(eth_dev);
                                return NULL;
                        }
                }
        } else {
                eth_dev = rte_eth_dev_attach_secondary(name);
                if (!eth_dev) {
                        PMD_DRV_LOG(NOTICE, "can not attach secondary");
                        return NULL;
                }
        }

        eth_dev->device = &dev->device;

        /* interrupt is simulated */
        dev->intr_handle.type = RTE_INTR_HANDLE_EXT;
        eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_LSC;
        eth_dev->intr_handle = &dev->intr_handle;

        /* allow ethdev to remove on close */
        eth_dev->data->dev_flags |= RTE_ETH_DEV_CLOSE_REMOVE;

        return eth_dev;
}

static void
eth_dev_vmbus_release(struct rte_eth_dev *eth_dev)
{
        /* mac_addrs must not be freed alone because part of dev_private */
        eth_dev->data->mac_addrs = NULL;
        /* free ether device */
        rte_eth_dev_release_port(eth_dev);

        eth_dev->device = NULL;
        eth_dev->intr_handle = NULL;
}

/* handle "latency=X" from devargs */
static int hn_set_latency(const char *key, const char *value, void *opaque)
{
        struct hn_data *hv = opaque;
        char *endp = NULL;
        unsigned long lat;

        errno = 0;
        lat = strtoul(value, &endp, 0);

        if (*value == '\0' || *endp != '\0') {
                PMD_DRV_LOG(ERR, "invalid parameter %s=%s", key, value);
                return -EINVAL;
        }

        PMD_DRV_LOG(DEBUG, "set latency %lu usec", lat);

        hv->latency = lat * 1000;       /* usec to nsec */
        return 0;
}

/* Parse device arguments */
static int hn_parse_args(const struct rte_eth_dev *dev)
{
        struct hn_data *hv = dev->data->dev_private;
        struct rte_devargs *devargs = dev->device->devargs;
        static const char * const valid_keys[] = {
                "latency",
                NULL
        };
        struct rte_kvargs *kvlist;
        int ret;

        if (!devargs)
                return 0;

        PMD_INIT_LOG(DEBUG, "device args %s %s",
                     devargs->name, devargs->args);

        kvlist = rte_kvargs_parse(devargs->args, valid_keys);
        if (!kvlist) {
                PMD_DRV_LOG(NOTICE, "invalid parameters");
                return -EINVAL;
        }

        ret = rte_kvargs_process(kvlist, "latency", hn_set_latency, hv);
        if (ret)
                PMD_DRV_LOG(ERR, "Unable to process latency arg\n");

        rte_kvargs_free(kvlist);
        return ret;
}

/* Update link status.
 * Note: the DPDK definition of "wait_to_complete"
 *   means block this call until link is up.
 *   which is not worth supporting.
 */
int
hn_dev_link_update(struct rte_eth_dev *dev,
                   int wait_to_complete)
{
        struct hn_data *hv = dev->data->dev_private;
        struct rte_eth_link link, old;
        int error;

        old = dev->data->dev_link;

        error = hn_rndis_get_linkstatus(hv);
        if (error)
                return error;

        hn_rndis_get_linkspeed(hv);

        hn_vf_link_update(dev, wait_to_complete);

        link = (struct rte_eth_link) {
                .link_duplex = ETH_LINK_FULL_DUPLEX,
                .link_autoneg = ETH_LINK_SPEED_FIXED,
                .link_speed = hv->link_speed / 10000,
        };

        if (hv->link_status == NDIS_MEDIA_STATE_CONNECTED)
                link.link_status = ETH_LINK_UP;
        else
                link.link_status = ETH_LINK_DOWN;

        if (old.link_status == link.link_status)
                return 0;

        PMD_INIT_LOG(DEBUG, "Port %d is %s", dev->data->port_id,
                     (link.link_status == ETH_LINK_UP) ? "up" : "down");

        return rte_eth_linkstatus_set(dev, &link);
}

static void hn_dev_info_get(struct rte_eth_dev *dev,
                            struct rte_eth_dev_info *dev_info)
{
        struct hn_data *hv = dev->data->dev_private;

        dev_info->speed_capa = ETH_LINK_SPEED_10G;
        dev_info->min_rx_bufsize = HN_MIN_RX_BUF_SIZE;
        dev_info->max_rx_pktlen  = HN_MAX_XFER_LEN;
        dev_info->max_mac_addrs  = 1;

        dev_info->hash_key_size = NDIS_HASH_KEYSIZE_TOEPLITZ;
        dev_info->flow_type_rss_offloads =
                ETH_RSS_IPV4 | ETH_RSS_IPV6 | ETH_RSS_TCP | ETH_RSS_UDP;

        dev_info->max_rx_queues = hv->max_queues;
        dev_info->max_tx_queues = hv->max_queues;

        hn_rndis_get_offload(hv, dev_info);
        hn_vf_info_get(hv, dev_info);
}

static void
hn_dev_promiscuous_enable(struct rte_eth_dev *dev)
{
        struct hn_data *hv = dev->data->dev_private;

        hn_rndis_set_rxfilter(hv, NDIS_PACKET_TYPE_PROMISCUOUS);
        hn_vf_promiscuous_enable(dev);
}

static void
hn_dev_promiscuous_disable(struct rte_eth_dev *dev)
{
        struct hn_data *hv = dev->data->dev_private;
        uint32_t filter;

        filter = NDIS_PACKET_TYPE_DIRECTED | NDIS_PACKET_TYPE_BROADCAST;
        if (dev->data->all_multicast)
                filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
        hn_rndis_set_rxfilter(hv, filter);
        hn_vf_promiscuous_disable(dev);
}

static void
hn_dev_allmulticast_enable(struct rte_eth_dev *dev)
{
        struct hn_data *hv = dev->data->dev_private;

        hn_rndis_set_rxfilter(hv, NDIS_PACKET_TYPE_DIRECTED |
                              NDIS_PACKET_TYPE_ALL_MULTICAST |
                        NDIS_PACKET_TYPE_BROADCAST);
        hn_vf_allmulticast_enable(dev);
}

static void
hn_dev_allmulticast_disable(struct rte_eth_dev *dev)
{
        struct hn_data *hv = dev->data->dev_private;

        hn_rndis_set_rxfilter(hv, NDIS_PACKET_TYPE_DIRECTED |
                             NDIS_PACKET_TYPE_BROADCAST);
        hn_vf_allmulticast_disable(dev);
}

static int
hn_dev_mc_addr_list(struct rte_eth_dev *dev,
                     struct ether_addr *mc_addr_set,
                     uint32_t nb_mc_addr)
{
        /* No filtering on the synthetic path, but can do it on VF */
        return hn_vf_mc_addr_list(dev, mc_addr_set, nb_mc_addr);
}

/* Setup shared rx/tx queue data */
static int hn_subchan_configure(struct hn_data *hv,
                                uint32_t subchan)
{
        struct vmbus_channel *primary = hn_primary_chan(hv);
        int err;
        unsigned int retry = 0;

        PMD_DRV_LOG(DEBUG,
                    "open %u subchannels", subchan);

        /* Send create sub channels command */
        err = hn_nvs_alloc_subchans(hv, &subchan);
        if (err)
                return  err;

        while (subchan > 0) {
                struct vmbus_channel *new_sc;
                uint16_t chn_index;

                err = rte_vmbus_subchan_open(primary, &new_sc);
                if (err == -ENOENT && ++retry < 1000) {
                        /* This can happen if not ready yet */
                        rte_delay_ms(10);
                        continue;
                }

                if (err) {
                        PMD_DRV_LOG(ERR,
                                    "open subchannel failed: %d", err);
                        return err;
                }

                rte_vmbus_set_latency(hv->vmbus, new_sc, hv->latency);

                retry = 0;
                chn_index = rte_vmbus_sub_channel_index(new_sc);
                if (chn_index == 0 || chn_index > hv->max_queues) {
                        PMD_DRV_LOG(ERR,
                                    "Invalid subchannel offermsg channel %u",
                                    chn_index);
                        return -EIO;
                }

                PMD_DRV_LOG(DEBUG, "new sub channel %u", chn_index);
                hv->channels[chn_index] = new_sc;
                --subchan;
        }

        return err;
}

static int hn_dev_configure(struct rte_eth_dev *dev)
{
        const struct rte_eth_conf *dev_conf = &dev->data->dev_conf;
        const struct rte_eth_rxmode *rxmode = &dev_conf->rxmode;
        const struct rte_eth_txmode *txmode = &dev_conf->txmode;

        const struct rte_eth_rss_conf *rss_conf =
                &dev_conf->rx_adv_conf.rss_conf;
        struct hn_data *hv = dev->data->dev_private;
        uint64_t unsupported;
        int err, subchan;

        PMD_INIT_FUNC_TRACE();

        unsupported = txmode->offloads & ~HN_TX_OFFLOAD_CAPS;
        if (unsupported) {
                PMD_DRV_LOG(NOTICE,
                            "unsupported TX offload: %#" PRIx64,
                            unsupported);
                return -EINVAL;
        }

        unsupported = rxmode->offloads & ~HN_RX_OFFLOAD_CAPS;
        if (unsupported) {
                PMD_DRV_LOG(NOTICE,
                            "unsupported RX offload: %#" PRIx64,
                            rxmode->offloads);
                return -EINVAL;
        }

        hv->vlan_strip = !!(rxmode->offloads & DEV_RX_OFFLOAD_VLAN_STRIP);

        err = hn_rndis_conf_offload(hv, txmode->offloads,
                                    rxmode->offloads);
        if (err) {
                PMD_DRV_LOG(NOTICE,
                            "offload configure failed");
                return err;
        }

        hv->num_queues = RTE_MAX(dev->data->nb_rx_queues,
                                 dev->data->nb_tx_queues);
        subchan = hv->num_queues - 1;
        if (subchan > 0) {
                err = hn_subchan_configure(hv, subchan);
                if (err) {
                        PMD_DRV_LOG(NOTICE,
                                    "subchannel configuration failed");
                        return err;
                }

                err = hn_rndis_conf_rss(hv, rss_conf);
                if (err) {
                        PMD_DRV_LOG(NOTICE,
                                    "rss configuration failed");
                        return err;
                }
        }

        return hn_vf_configure(dev, dev_conf);
}

static int hn_dev_stats_get(struct rte_eth_dev *dev,
                            struct rte_eth_stats *stats)
{
        unsigned int i;

        hn_vf_stats_get(dev, stats);

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                const struct hn_tx_queue *txq = dev->data->tx_queues[i];

                if (!txq)
                        continue;

                stats->opackets += txq->stats.packets;
                stats->obytes += txq->stats.bytes;
                stats->oerrors += txq->stats.errors;

                if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
                        stats->q_opackets[i] = txq->stats.packets;
                        stats->q_obytes[i] = txq->stats.bytes;
                }
        }

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                const struct hn_rx_queue *rxq = dev->data->rx_queues[i];

                if (!rxq)
                        continue;

                stats->ipackets += rxq->stats.packets;
                stats->ibytes += rxq->stats.bytes;
                stats->ierrors += rxq->stats.errors;
                stats->imissed += rxq->stats.ring_full;

                if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
                        stats->q_ipackets[i] = rxq->stats.packets;
                        stats->q_ibytes[i] = rxq->stats.bytes;
                }
        }

        stats->rx_nombuf = dev->data->rx_mbuf_alloc_failed;
        return 0;
}

static void
hn_dev_stats_reset(struct rte_eth_dev *dev)
{
        unsigned int i;

        PMD_INIT_FUNC_TRACE();

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                struct hn_tx_queue *txq = dev->data->tx_queues[i];

                if (!txq)
                        continue;
                memset(&txq->stats, 0, sizeof(struct hn_stats));
        }

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                struct hn_rx_queue *rxq = dev->data->rx_queues[i];

                if (!rxq)
                        continue;

                memset(&rxq->stats, 0, sizeof(struct hn_stats));
        }
}

static void
hn_dev_xstats_reset(struct rte_eth_dev *dev)
{
        hn_dev_stats_reset(dev);
        hn_vf_xstats_reset(dev);
}

static int
hn_dev_xstats_count(struct rte_eth_dev *dev)
{
        int ret, count;

        count = dev->data->nb_tx_queues * RTE_DIM(hn_stat_strings);
        count += dev->data->nb_rx_queues * RTE_DIM(hn_stat_strings);

        ret = hn_vf_xstats_get_names(dev, NULL, 0);
        if (ret < 0)
                return ret;

        return count + ret;
}

static int
hn_dev_xstats_get_names(struct rte_eth_dev *dev,
                        struct rte_eth_xstat_name *xstats_names,
                        unsigned int limit)
{
        unsigned int i, t, count = 0;
        int ret;

        if (!xstats_names)
                return hn_dev_xstats_count(dev);

        /* Note: limit checked in rte_eth_xstats_names() */
        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                const struct hn_tx_queue *txq = dev->data->tx_queues[i];

                if (!txq)
                        continue;

                if (count >= limit)
                        break;

                for (t = 0; t < RTE_DIM(hn_stat_strings); t++)
                        snprintf(xstats_names[count++].name,
                                 RTE_ETH_XSTATS_NAME_SIZE,
                                 "tx_q%u_%s", i, hn_stat_strings[t].name);
        }

        for (i = 0; i < dev->data->nb_rx_queues; i++)  {
                const struct hn_rx_queue *rxq = dev->data->rx_queues[i];

                if (!rxq)
                        continue;

                if (count >= limit)
                        break;

                for (t = 0; t < RTE_DIM(hn_stat_strings); t++)
                        snprintf(xstats_names[count++].name,
                                 RTE_ETH_XSTATS_NAME_SIZE,
                                 "rx_q%u_%s", i,
                                 hn_stat_strings[t].name);
        }

        ret = hn_vf_xstats_get_names(dev, xstats_names + count,
                                     limit - count);
        if (ret < 0)
                return ret;

        return count + ret;
}

static int
hn_dev_xstats_get(struct rte_eth_dev *dev,
                  struct rte_eth_xstat *xstats,
                  unsigned int n)
{
        unsigned int i, t, count = 0;
        const unsigned int nstats = hn_dev_xstats_count(dev);
        const char *stats;
        int ret;

        PMD_INIT_FUNC_TRACE();

        if (n < nstats)
                return nstats;

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                const struct hn_tx_queue *txq = dev->data->tx_queues[i];

                if (!txq)
                        continue;

                stats = (const char *)&txq->stats;
                for (t = 0; t < RTE_DIM(hn_stat_strings); t++)
                        xstats[count++].value = *(const uint64_t *)
                                (stats + hn_stat_strings[t].offset);
        }

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                const struct hn_rx_queue *rxq = dev->data->rx_queues[i];

                if (!rxq)
                        continue;

                stats = (const char *)&rxq->stats;
                for (t = 0; t < RTE_DIM(hn_stat_strings); t++)
                        xstats[count++].value = *(const uint64_t *)
                                (stats + hn_stat_strings[t].offset);
        }

        ret = hn_vf_xstats_get(dev, xstats + count, n - count);
        if (ret < 0)
                return ret;

        return count + ret;
}

static int
hn_dev_start(struct rte_eth_dev *dev)
{
        struct hn_data *hv = dev->data->dev_private;
        int error;

        PMD_INIT_FUNC_TRACE();

        error = hn_rndis_set_rxfilter(hv,
                                      NDIS_PACKET_TYPE_BROADCAST |
                                      NDIS_PACKET_TYPE_ALL_MULTICAST |
                                      NDIS_PACKET_TYPE_DIRECTED);
        if (error)
                return error;

        error = hn_vf_start(dev);
        if (error)
                hn_rndis_set_rxfilter(hv, 0);

        return error;
}

static void
hn_dev_stop(struct rte_eth_dev *dev)
{
        struct hn_data *hv = dev->data->dev_private;

        PMD_INIT_FUNC_TRACE();

        hn_rndis_set_rxfilter(hv, 0);
        hn_vf_stop(dev);
}

static void
hn_dev_close(struct rte_eth_dev *dev)
{
        PMD_INIT_FUNC_TRACE();

        hn_vf_close(dev);
        hn_dev_free_queues(dev);
}

static const struct eth_dev_ops hn_eth_dev_ops = {
        .dev_configure          = hn_dev_configure,
        .dev_start              = hn_dev_start,
        .dev_stop               = hn_dev_stop,
        .dev_close              = hn_dev_close,
        .dev_infos_get          = hn_dev_info_get,
        .dev_supported_ptypes_get = hn_vf_supported_ptypes,
        .promiscuous_enable     = hn_dev_promiscuous_enable,
        .promiscuous_disable    = hn_dev_promiscuous_disable,
        .allmulticast_enable    = hn_dev_allmulticast_enable,
        .allmulticast_disable   = hn_dev_allmulticast_disable,
        .set_mc_addr_list       = hn_dev_mc_addr_list,
        .tx_queue_setup         = hn_dev_tx_queue_setup,
        .tx_queue_release       = hn_dev_tx_queue_release,
        .tx_done_cleanup        = hn_dev_tx_done_cleanup,
        .rx_queue_setup         = hn_dev_rx_queue_setup,
        .rx_queue_release       = hn_dev_rx_queue_release,
        .link_update            = hn_dev_link_update,
        .stats_get              = hn_dev_stats_get,
        .stats_reset            = hn_dev_stats_reset,
        .xstats_get             = hn_dev_xstats_get,
        .xstats_get_names       = hn_dev_xstats_get_names,
        .xstats_reset           = hn_dev_xstats_reset,
};

/*
 * Setup connection between PMD and kernel.
 */
static int
hn_attach(struct hn_data *hv, unsigned int mtu)
{
        int error;

        /* Attach NVS */
        error = hn_nvs_attach(hv, mtu);
        if (error)
                goto failed_nvs;

        /* Attach RNDIS */
        error = hn_rndis_attach(hv);
        if (error)
                goto failed_rndis;

        /*
         * NOTE:
         * Under certain conditions on certain versions of Hyper-V,
         * the RNDIS rxfilter is _not_ zero on the hypervisor side
         * after the successful RNDIS initialization.
         */
        hn_rndis_set_rxfilter(hv, NDIS_PACKET_TYPE_NONE);
        return 0;
failed_rndis:
        hn_nvs_detach(hv);
failed_nvs:
        return error;
}

static void
hn_detach(struct hn_data *hv)
{
        hn_nvs_detach(hv);
        hn_rndis_detach(hv);
}

static int
eth_hn_dev_init(struct rte_eth_dev *eth_dev)
{
        struct hn_data *hv = eth_dev->data->dev_private;
        struct rte_device *device = eth_dev->device;
        struct rte_vmbus_device *vmbus;
        unsigned int rxr_cnt;
        int err, max_chan;

        PMD_INIT_FUNC_TRACE();

        vmbus = container_of(device, struct rte_vmbus_device, device);
        eth_dev->dev_ops = &hn_eth_dev_ops;
        eth_dev->tx_pkt_burst = &hn_xmit_pkts;
        eth_dev->rx_pkt_burst = &hn_recv_pkts;

        /*
         * for secondary processes, we don't initialize any further as primary
         * has already done this work.
         */
        if (rte_eal_process_type() != RTE_PROC_PRIMARY)
                return 0;

        /* Since Hyper-V only supports one MAC address, just use local data */
        eth_dev->data->mac_addrs = &hv->mac_addr;

        hv->vmbus = vmbus;
        hv->rxbuf_res = &vmbus->resource[HV_RECV_BUF_MAP];
        hv->chim_res  = &vmbus->resource[HV_SEND_BUF_MAP];
        hv->port_id = eth_dev->data->port_id;
        hv->latency = HN_CHAN_LATENCY_NS;
        hv->max_queues = 1;
        hv->vf_port = HN_INVALID_PORT;

        err = hn_parse_args(eth_dev);
        if (err)
                return err;

        strlcpy(hv->owner.name, eth_dev->device->name,
                RTE_ETH_MAX_OWNER_NAME_LEN);
        err = rte_eth_dev_owner_new(&hv->owner.id);
        if (err) {
                PMD_INIT_LOG(ERR, "Can not get owner id");
                return err;
        }

        /* Initialize primary channel input for control operations */
        err = rte_vmbus_chan_open(vmbus, &hv->channels[0]);
        if (err)
                return err;

        rte_vmbus_set_latency(hv->vmbus, hv->channels[0], hv->latency);

        hv->primary = hn_rx_queue_alloc(hv, 0,
                                        eth_dev->device->numa_node);

        if (!hv->primary)
                return -ENOMEM;

        err = hn_attach(hv, ETHER_MTU);
        if  (err)
                goto failed;

        err = hn_tx_pool_init(eth_dev);
        if (err)
                goto failed;

        err = hn_rndis_get_eaddr(hv, hv->mac_addr.addr_bytes);
        if (err)
                goto failed;

        /* Multi queue requires later versions of windows server */
        if (hv->nvs_ver < NVS_VERSION_5)
                return 0;

        max_chan = rte_vmbus_max_channels(vmbus);
        PMD_INIT_LOG(DEBUG, "VMBus max channels %d", max_chan);
        if (max_chan <= 0)
                goto failed;

        if (hn_rndis_query_rsscaps(hv, &rxr_cnt) != 0)
                rxr_cnt = 1;

        hv->max_queues = RTE_MIN(rxr_cnt, (unsigned int)max_chan);

        /* If VF was reported but not added, do it now */
        if (hv->vf_present && !hn_vf_attached(hv)) {
                PMD_INIT_LOG(DEBUG, "Adding VF device");

                err = hn_vf_add(eth_dev, hv);
                if (err)
                        hv->vf_present = 0;
        }

        return 0;

failed:
        PMD_INIT_LOG(NOTICE, "device init failed");

        hn_tx_pool_uninit(eth_dev);
        hn_detach(hv);
        return err;
}

static int
eth_hn_dev_uninit(struct rte_eth_dev *eth_dev)
{
        struct hn_data *hv = eth_dev->data->dev_private;

        PMD_INIT_FUNC_TRACE();

        if (rte_eal_process_type() != RTE_PROC_PRIMARY)
                return 0;

        hn_dev_stop(eth_dev);
        hn_dev_close(eth_dev);

        eth_dev->dev_ops = NULL;
        eth_dev->tx_pkt_burst = NULL;
        eth_dev->rx_pkt_burst = NULL;

        hn_detach(hv);
        hn_tx_pool_uninit(eth_dev);
        rte_vmbus_chan_close(hv->primary->chan);
        rte_free(hv->primary);
        rte_eth_dev_owner_delete(hv->owner.id);

        return 0;
}

static int eth_hn_probe(struct rte_vmbus_driver *drv __rte_unused,
                        struct rte_vmbus_device *dev)
{
        struct rte_eth_dev *eth_dev;
        int ret;

        PMD_INIT_FUNC_TRACE();

        eth_dev = eth_dev_vmbus_allocate(dev, sizeof(struct hn_data));
        if (!eth_dev)
                return -ENOMEM;

        ret = eth_hn_dev_init(eth_dev);
        if (ret)
                eth_dev_vmbus_release(eth_dev);
        else
                rte_eth_dev_probing_finish(eth_dev);

        return ret;
}

static int eth_hn_remove(struct rte_vmbus_device *dev)
{
        struct rte_eth_dev *eth_dev;
        int ret;

        PMD_INIT_FUNC_TRACE();

        eth_dev = rte_eth_dev_allocated(dev->device.name);
        if (!eth_dev)
                return -ENODEV;

        ret = eth_hn_dev_uninit(eth_dev);
        if (ret)
                return ret;

        eth_dev_vmbus_release(eth_dev);
        return 0;
}

/* Network device GUID */
static const rte_uuid_t hn_net_ids[] = {
        /*  f8615163-df3e-46c5-913f-f2d2f965ed0e */
        RTE_UUID_INIT(0xf8615163, 0xdf3e, 0x46c5, 0x913f, 0xf2d2f965ed0eULL),
        { 0 }
};

static struct rte_vmbus_driver rte_netvsc_pmd = {
        .id_table = hn_net_ids,
        .probe = eth_hn_probe,
        .remove = eth_hn_remove,
};

RTE_PMD_REGISTER_VMBUS(net_netvsc, rte_netvsc_pmd);
RTE_PMD_REGISTER_KMOD_DEP(net_netvsc, "* uio_hv_generic");

RTE_INIT(hn_init_log)
{
        hn_logtype_init = rte_log_register("pmd.net.netvsc.init");
        if (hn_logtype_init >= 0)
                rte_log_set_level(hn_logtype_init, RTE_LOG_NOTICE);
        hn_logtype_driver = rte_log_register("pmd.net.netvsc.driver");
        if (hn_logtype_driver >= 0)
                rte_log_set_level(hn_logtype_driver, RTE_LOG_NOTICE);
}