qemu/hw/net/rocker/rocker.c

/*
 * QEMU rocker switch emulation - PCI device
 *
 * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>
 * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#include "qemu/osdep.h"
#include "hw/pci/pci.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "hw/pci/msix.h"
#include "net/net.h"
#include "net/eth.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-rocker.h"
#include "qemu/iov.h"
#include "qemu/module.h"
#include "qemu/bitops.h"

#include "rocker.h"
#include "rocker_hw.h"
#include "rocker_fp.h"
#include "rocker_desc.h"
#include "rocker_tlv.h"
#include "rocker_world.h"
#include "rocker_of_dpa.h"

struct rocker {
    /* private */
    PCIDevice parent_obj;
    /* public */

    MemoryRegion mmio;
    MemoryRegion msix_bar;

    /* switch configuration */
    char *name;                  /* switch name */
    char *world_name;            /* world name */
    uint32_t fp_ports;           /* front-panel port count */
    NICPeers *fp_ports_peers;
    MACAddr fp_start_macaddr;    /* front-panel port 0 mac addr */
    uint64_t switch_id;          /* switch id */

    /* front-panel ports */
    FpPort *fp_port[ROCKER_FP_PORTS_MAX];

    /* register backings */
    uint32_t test_reg;
    uint64_t test_reg64;
    dma_addr_t test_dma_addr;
    uint32_t test_dma_size;
    uint64_t lower32;            /* lower 32-bit val in 2-part 64-bit access */

    /* desc rings */
    DescRing **rings;

    /* switch worlds */
    World *worlds[ROCKER_WORLD_TYPE_MAX];
    World *world_dflt;

    QLIST_ENTRY(rocker) next;
};

#define TYPE_ROCKER "rocker"

#define ROCKER(obj) \
    OBJECT_CHECK(Rocker, (obj), TYPE_ROCKER)

static QLIST_HEAD(, rocker) rockers;

Rocker *rocker_find(const char *name)
{
    Rocker *r;

    QLIST_FOREACH(r, &rockers, next)
        if (strcmp(r->name, name) == 0) {
            return r;
        }

    return NULL;
}

World *rocker_get_world(Rocker *r, enum rocker_world_type type)
{
    if (type < ROCKER_WORLD_TYPE_MAX) {
        return r->worlds[type];
    }
    return NULL;
}

RockerSwitch *qmp_query_rocker(const char *name, Error **errp)
{
    RockerSwitch *rocker;
    Rocker *r;

    r = rocker_find(name);
    if (!r) {
        error_setg(errp, "rocker %s not found", name);
        return NULL;
    }

    rocker = g_new0(RockerSwitch, 1);
    rocker->name = g_strdup(r->name);
    rocker->id = r->switch_id;
    rocker->ports = r->fp_ports;

    return rocker;
}

RockerPortList *qmp_query_rocker_ports(const char *name, Error **errp)
{
    RockerPortList *list = NULL;
    Rocker *r;
    int i;

    r = rocker_find(name);
    if (!r) {
        error_setg(errp, "rocker %s not found", name);
        return NULL;
    }

    for (i = r->fp_ports - 1; i >= 0; i--) {
        RockerPortList *info = g_malloc0(sizeof(*info));
        info->value = g_malloc0(sizeof(*info->value));
        struct fp_port *port = r->fp_port[i];

        fp_port_get_info(port, info);
        info->next = list;
        list = info;
    }

    return list;
}

uint32_t rocker_fp_ports(Rocker *r)
{
    return r->fp_ports;
}

static uint32_t rocker_get_pport_by_tx_ring(Rocker *r,
                                            DescRing *ring)
{
    return (desc_ring_index(ring) - 2) / 2 + 1;
}

static int tx_consume(Rocker *r, DescInfo *info)
{
    PCIDevice *dev = PCI_DEVICE(r);
    char *buf = desc_get_buf(info, true);
    RockerTlv *tlv_frag;
    RockerTlv *tlvs[ROCKER_TLV_TX_MAX + 1];
    struct iovec iov[ROCKER_TX_FRAGS_MAX] = { { 0, }, };
    uint32_t pport;
    uint32_t port;
    uint16_t tx_offload = ROCKER_TX_OFFLOAD_NONE;
    uint16_t tx_l3_csum_off = 0;
    uint16_t tx_tso_mss = 0;
    uint16_t tx_tso_hdr_len = 0;
    int iovcnt = 0;
    int err = ROCKER_OK;
    int rem;
    int i;

    if (!buf) {
        return -ROCKER_ENXIO;
    }

    rocker_tlv_parse(tlvs, ROCKER_TLV_TX_MAX, buf, desc_tlv_size(info));

    if (!tlvs[ROCKER_TLV_TX_FRAGS]) {
        return -ROCKER_EINVAL;
    }

    pport = rocker_get_pport_by_tx_ring(r, desc_get_ring(info));
    if (!fp_port_from_pport(pport, &port)) {
        return -ROCKER_EINVAL;
    }

    if (tlvs[ROCKER_TLV_TX_OFFLOAD]) {
        tx_offload = rocker_tlv_get_u8(tlvs[ROCKER_TLV_TX_OFFLOAD]);
    }

    switch (tx_offload) {
    case ROCKER_TX_OFFLOAD_L3_CSUM:
        if (!tlvs[ROCKER_TLV_TX_L3_CSUM_OFF]) {
            return -ROCKER_EINVAL;
        }
        break;
    case ROCKER_TX_OFFLOAD_TSO:
        if (!tlvs[ROCKER_TLV_TX_TSO_MSS] ||
            !tlvs[ROCKER_TLV_TX_TSO_HDR_LEN]) {
            return -ROCKER_EINVAL;
        }
        break;
    }

    if (tlvs[ROCKER_TLV_TX_L3_CSUM_OFF]) {
        tx_l3_csum_off = rocker_tlv_get_le16(tlvs[ROCKER_TLV_TX_L3_CSUM_OFF]);
    }

    if (tlvs[ROCKER_TLV_TX_TSO_MSS]) {
        tx_tso_mss = rocker_tlv_get_le16(tlvs[ROCKER_TLV_TX_TSO_MSS]);
    }

    if (tlvs[ROCKER_TLV_TX_TSO_HDR_LEN]) {
        tx_tso_hdr_len = rocker_tlv_get_le16(tlvs[ROCKER_TLV_TX_TSO_HDR_LEN]);
    }

    rocker_tlv_for_each_nested(tlv_frag, tlvs[ROCKER_TLV_TX_FRAGS], rem) {
        hwaddr frag_addr;
        uint16_t frag_len;

        if (rocker_tlv_type(tlv_frag) != ROCKER_TLV_TX_FRAG) {
            err = -ROCKER_EINVAL;
            goto err_bad_attr;
        }

        rocker_tlv_parse_nested(tlvs, ROCKER_TLV_TX_FRAG_ATTR_MAX, tlv_frag);

        if (!tlvs[ROCKER_TLV_TX_FRAG_ATTR_ADDR] ||
            !tlvs[ROCKER_TLV_TX_FRAG_ATTR_LEN]) {
            err = -ROCKER_EINVAL;
            goto err_bad_attr;
        }

        frag_addr = rocker_tlv_get_le64(tlvs[ROCKER_TLV_TX_FRAG_ATTR_ADDR]);
        frag_len = rocker_tlv_get_le16(tlvs[ROCKER_TLV_TX_FRAG_ATTR_LEN]);

        if (iovcnt >= ROCKER_TX_FRAGS_MAX) {
            goto err_too_many_frags;
        }
        iov[iovcnt].iov_len = frag_len;
        iov[iovcnt].iov_base = g_malloc(frag_len);

        pci_dma_read(dev, frag_addr, iov[iovcnt].iov_base,
                     iov[iovcnt].iov_len);

        iovcnt++;
    }

    if (iovcnt) {
        /* XXX perform Tx offloads */
        /* XXX   silence compiler for now */
        tx_l3_csum_off += tx_tso_mss = tx_tso_hdr_len = 0;
    }

    err = fp_port_eg(r->fp_port[port], iov, iovcnt);

err_too_many_frags:
err_bad_attr:
    for (i = 0; i < ROCKER_TX_FRAGS_MAX; i++) {
        g_free(iov[i].iov_base);
    }

    return err;
}

static int cmd_get_port_settings(Rocker *r,
                                 DescInfo *info, char *buf,
                                 RockerTlv *cmd_info_tlv)
{
    RockerTlv *tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MAX + 1];
    RockerTlv *nest;
    FpPort *fp_port;
    uint32_t pport;
    uint32_t port;
    uint32_t speed;
    uint8_t duplex;
    uint8_t autoneg;
    uint8_t learning;
    char *phys_name;
    MACAddr macaddr;
    enum rocker_world_type mode;
    size_t tlv_size;
    int pos;
    int err;

    rocker_tlv_parse_nested(tlvs, ROCKER_TLV_CMD_PORT_SETTINGS_MAX,
                            cmd_info_tlv);

    if (!tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_PPORT]) {
        return -ROCKER_EINVAL;
    }

    pport = rocker_tlv_get_le32(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_PPORT]);
    if (!fp_port_from_pport(pport, &port)) {
        return -ROCKER_EINVAL;
    }
    fp_port = r->fp_port[port];

    err = fp_port_get_settings(fp_port, &speed, &duplex, &autoneg);
    if (err) {
        return err;
    }

    fp_port_get_macaddr(fp_port, &macaddr);
    mode = world_type(fp_port_get_world(fp_port));
    learning = fp_port_get_learning(fp_port);
    phys_name = fp_port_get_name(fp_port);

    tlv_size = rocker_tlv_total_size(0) +                 /* nest */
               rocker_tlv_total_size(sizeof(uint32_t)) +  /*   pport */
               rocker_tlv_total_size(sizeof(uint32_t)) +  /*   speed */
               rocker_tlv_total_size(sizeof(uint8_t)) +   /*   duplex */
               rocker_tlv_total_size(sizeof(uint8_t)) +   /*   autoneg */
               rocker_tlv_total_size(sizeof(macaddr.a)) + /*   macaddr */
               rocker_tlv_total_size(sizeof(uint8_t)) +   /*   mode */
               rocker_tlv_total_size(sizeof(uint8_t)) +   /*   learning */
               rocker_tlv_total_size(strlen(phys_name));

    if (tlv_size > desc_buf_size(info)) {
        return -ROCKER_EMSGSIZE;
    }

    pos = 0;
    nest = rocker_tlv_nest_start(buf, &pos, ROCKER_TLV_CMD_INFO);
    rocker_tlv_put_le32(buf, &pos, ROCKER_TLV_CMD_PORT_SETTINGS_PPORT, pport);
    rocker_tlv_put_le32(buf, &pos, ROCKER_TLV_CMD_PORT_SETTINGS_SPEED, speed);
    rocker_tlv_put_u8(buf, &pos, ROCKER_TLV_CMD_PORT_SETTINGS_DUPLEX, duplex);
    rocker_tlv_put_u8(buf, &pos, ROCKER_TLV_CMD_PORT_SETTINGS_AUTONEG, autoneg);
    rocker_tlv_put(buf, &pos, ROCKER_TLV_CMD_PORT_SETTINGS_MACADDR,
                   sizeof(macaddr.a), macaddr.a);
    rocker_tlv_put_u8(buf, &pos, ROCKER_TLV_CMD_PORT_SETTINGS_MODE, mode);
    rocker_tlv_put_u8(buf, &pos, ROCKER_TLV_CMD_PORT_SETTINGS_LEARNING,
                      learning);
    rocker_tlv_put(buf, &pos, ROCKER_TLV_CMD_PORT_SETTINGS_PHYS_NAME,
                   strlen(phys_name), phys_name);
    rocker_tlv_nest_end(buf, &pos, nest);

    return desc_set_buf(info, tlv_size);
}

static int cmd_set_port_settings(Rocker *r,
                                 RockerTlv *cmd_info_tlv)
{
    RockerTlv *tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MAX + 1];
    FpPort *fp_port;
    uint32_t pport;
    uint32_t port;
    uint32_t speed;
    uint8_t duplex;
    uint8_t autoneg;
    uint8_t learning;
    MACAddr macaddr;
    enum rocker_world_type mode;
    int err;

    rocker_tlv_parse_nested(tlvs, ROCKER_TLV_CMD_PORT_SETTINGS_MAX,
                            cmd_info_tlv);

    if (!tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_PPORT]) {
        return -ROCKER_EINVAL;
    }

    pport = rocker_tlv_get_le32(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_PPORT]);
    if (!fp_port_from_pport(pport, &port)) {
        return -ROCKER_EINVAL;
    }
    fp_port = r->fp_port[port];

    if (tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_SPEED] &&
        tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_DUPLEX] &&
        tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_AUTONEG]) {

        speed = rocker_tlv_get_le32(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_SPEED]);
        duplex = rocker_tlv_get_u8(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_DUPLEX]);
        autoneg = rocker_tlv_get_u8(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_AUTONEG]);

        err = fp_port_set_settings(fp_port, speed, duplex, autoneg);
        if (err) {
            return err;
        }
    }

    if (tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MACADDR]) {
        if (rocker_tlv_len(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MACADDR]) !=
            sizeof(macaddr.a)) {
            return -ROCKER_EINVAL;
        }
        memcpy(macaddr.a,
               rocker_tlv_data(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MACADDR]),
               sizeof(macaddr.a));
        fp_port_set_macaddr(fp_port, &macaddr);
    }

    if (tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MODE]) {
        mode = rocker_tlv_get_u8(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MODE]);
        if (mode >= ROCKER_WORLD_TYPE_MAX) {
            return -ROCKER_EINVAL;
        }
        /* We don't support world change. */
        if (!fp_port_check_world(fp_port, r->worlds[mode])) {
            return -ROCKER_EINVAL;
        }
    }

    if (tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_LEARNING]) {
        learning =
            rocker_tlv_get_u8(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_LEARNING]);
        fp_port_set_learning(fp_port, learning);
    }

    return ROCKER_OK;
}

static int cmd_consume(Rocker *r, DescInfo *info)
{
    char *buf = desc_get_buf(info, false);
    RockerTlv *tlvs[ROCKER_TLV_CMD_MAX + 1];
    RockerTlv *info_tlv;
    World *world;
    uint16_t cmd;
    int err;

    if (!buf) {
        return -ROCKER_ENXIO;
    }

    rocker_tlv_parse(tlvs, ROCKER_TLV_CMD_MAX, buf, desc_tlv_size(info));

    if (!tlvs[ROCKER_TLV_CMD_TYPE] || !tlvs[ROCKER_TLV_CMD_INFO]) {
        return -ROCKER_EINVAL;
    }

    cmd = rocker_tlv_get_le16(tlvs[ROCKER_TLV_CMD_TYPE]);
    info_tlv = tlvs[ROCKER_TLV_CMD_INFO];

    /* This might be reworked to something like this:
     * Every world will have an array of command handlers from
     * ROCKER_TLV_CMD_TYPE_UNSPEC to ROCKER_TLV_CMD_TYPE_MAX. There is
     * up to each world to implement whatever command it want.
     * It can reference "generic" commands as cmd_set_port_settings or
     * cmd_get_port_settings
     */

    switch (cmd) {
    case ROCKER_TLV_CMD_TYPE_OF_DPA_FLOW_ADD:
    case ROCKER_TLV_CMD_TYPE_OF_DPA_FLOW_MOD:
    case ROCKER_TLV_CMD_TYPE_OF_DPA_FLOW_DEL:
    case ROCKER_TLV_CMD_TYPE_OF_DPA_FLOW_GET_STATS:
    case ROCKER_TLV_CMD_TYPE_OF_DPA_GROUP_ADD:
    case ROCKER_TLV_CMD_TYPE_OF_DPA_GROUP_MOD:
    case ROCKER_TLV_CMD_TYPE_OF_DPA_GROUP_DEL:
    case ROCKER_TLV_CMD_TYPE_OF_DPA_GROUP_GET_STATS:
        world = r->worlds[ROCKER_WORLD_TYPE_OF_DPA];
        err = world_do_cmd(world, info, buf, cmd, info_tlv);
        break;
    case ROCKER_TLV_CMD_TYPE_GET_PORT_SETTINGS:
        err = cmd_get_port_settings(r, info, buf, info_tlv);
        break;
    case ROCKER_TLV_CMD_TYPE_SET_PORT_SETTINGS:
        err = cmd_set_port_settings(r, info_tlv);
        break;
    default:
        err = -ROCKER_EINVAL;
        break;
    }

    return err;
}

static void rocker_msix_irq(Rocker *r, unsigned vector)
{
    PCIDevice *dev = PCI_DEVICE(r);

    DPRINTF("MSI-X notify request for vector %d\n", vector);
    if (vector >= ROCKER_MSIX_VEC_COUNT(r->fp_ports)) {
        DPRINTF("incorrect vector %d\n", vector);
        return;
    }
    msix_notify(dev, vector);
}

int rocker_event_link_changed(Rocker *r, uint32_t pport, bool link_up)
{
    DescRing *ring = r->rings[ROCKER_RING_EVENT];
    DescInfo *info = desc_ring_fetch_desc(ring);
    RockerTlv *nest;
    char *buf;
    size_t tlv_size;
    int pos;
    int err;

    if (!info) {
        return -ROCKER_ENOBUFS;
    }

    tlv_size = rocker_tlv_total_size(sizeof(uint16_t)) +  /* event type */
               rocker_tlv_total_size(0) +                 /* nest */
               rocker_tlv_total_size(sizeof(uint32_t)) +  /*   pport */
               rocker_tlv_total_size(sizeof(uint8_t));    /*   link up */

    if (tlv_size > desc_buf_size(info)) {
        err = -ROCKER_EMSGSIZE;
        goto err_too_big;
    }

    buf = desc_get_buf(info, false);
    if (!buf) {
        err = -ROCKER_ENOMEM;
        goto err_no_mem;
    }

    pos = 0;
    rocker_tlv_put_le32(buf, &pos, ROCKER_TLV_EVENT_TYPE,
                        ROCKER_TLV_EVENT_TYPE_LINK_CHANGED);
    nest = rocker_tlv_nest_start(buf, &pos, ROCKER_TLV_EVENT_INFO);
    rocker_tlv_put_le32(buf, &pos, ROCKER_TLV_EVENT_LINK_CHANGED_PPORT, pport);
    rocker_tlv_put_u8(buf, &pos, ROCKER_TLV_EVENT_LINK_CHANGED_LINKUP,
                      link_up ? 1 : 0);
    rocker_tlv_nest_end(buf, &pos, nest);

    err = desc_set_buf(info, tlv_size);

err_too_big:
err_no_mem:
    if (desc_ring_post_desc(ring, err)) {
        rocker_msix_irq(r, ROCKER_MSIX_VEC_EVENT);
    }

    return err;
}

int rocker_event_mac_vlan_seen(Rocker *r, uint32_t pport, uint8_t *addr,
                               uint16_t vlan_id)
{
    DescRing *ring = r->rings[ROCKER_RING_EVENT];
    DescInfo *info;
    FpPort *fp_port;
    uint32_t port;
    RockerTlv *nest;
    char *buf;
    size_t tlv_size;
    int pos;
    int err;

    if (!fp_port_from_pport(pport, &port)) {
        return -ROCKER_EINVAL;
    }
    fp_port = r->fp_port[port];
    if (!fp_port_get_learning(fp_port)) {
        return ROCKER_OK;
    }

    info = desc_ring_fetch_desc(ring);
    if (!info) {
        return -ROCKER_ENOBUFS;
    }

    tlv_size = rocker_tlv_total_size(sizeof(uint16_t)) +  /* event type */
               rocker_tlv_total_size(0) +                 /* nest */
               rocker_tlv_total_size(sizeof(uint32_t)) +  /*   pport */
               rocker_tlv_total_size(ETH_ALEN) +          /*   mac addr */
               rocker_tlv_total_size(sizeof(uint16_t));   /*   vlan_id */

    if (tlv_size > desc_buf_size(info)) {
        err = -ROCKER_EMSGSIZE;
        goto err_too_big;
    }

    buf = desc_get_buf(info, false);
    if (!buf) {
        err = -ROCKER_ENOMEM;
        goto err_no_mem;
    }

    pos = 0;
    rocker_tlv_put_le32(buf, &pos, ROCKER_TLV_EVENT_TYPE,
                        ROCKER_TLV_EVENT_TYPE_MAC_VLAN_SEEN);
    nest = rocker_tlv_nest_start(buf, &pos, ROCKER_TLV_EVENT_INFO);
    rocker_tlv_put_le32(buf, &pos, ROCKER_TLV_EVENT_MAC_VLAN_PPORT, pport);
    rocker_tlv_put(buf, &pos, ROCKER_TLV_EVENT_MAC_VLAN_MAC, ETH_ALEN, addr);
    rocker_tlv_put_u16(buf, &pos, ROCKER_TLV_EVENT_MAC_VLAN_VLAN_ID, vlan_id);
    rocker_tlv_nest_end(buf, &pos, nest);

    err = desc_set_buf(info, tlv_size);

err_too_big:
err_no_mem:
    if (desc_ring_post_desc(ring, err)) {
        rocker_msix_irq(r, ROCKER_MSIX_VEC_EVENT);
    }

    return err;
}

static DescRing *rocker_get_rx_ring_by_pport(Rocker *r,
                                                     uint32_t pport)
{
    return r->rings[(pport - 1) * 2 + 3];
}

int rx_produce(World *world, uint32_t pport,
               const struct iovec *iov, int iovcnt, uint8_t copy_to_cpu)
{
    Rocker *r = world_rocker(world);
    PCIDevice *dev = (PCIDevice *)r;
    DescRing *ring = rocker_get_rx_ring_by_pport(r, pport);
    DescInfo *info = desc_ring_fetch_desc(ring);
    char *data;
    size_t data_size = iov_size(iov, iovcnt);
    char *buf;
    uint16_t rx_flags = 0;
    uint16_t rx_csum = 0;
    size_t tlv_size;
    RockerTlv *tlvs[ROCKER_TLV_RX_MAX + 1];
    hwaddr frag_addr;
    uint16_t frag_max_len;
    int pos;
    int err;

    if (!info) {
        return -ROCKER_ENOBUFS;
    }

    buf = desc_get_buf(info, false);
    if (!buf) {
        err = -ROCKER_ENXIO;
        goto out;
    }
    rocker_tlv_parse(tlvs, ROCKER_TLV_RX_MAX, buf, desc_tlv_size(info));

    if (!tlvs[ROCKER_TLV_RX_FRAG_ADDR] ||
        !tlvs[ROCKER_TLV_RX_FRAG_MAX_LEN]) {
        err = -ROCKER_EINVAL;
        goto out;
    }

    frag_addr = rocker_tlv_get_le64(tlvs[ROCKER_TLV_RX_FRAG_ADDR]);
    frag_max_len = rocker_tlv_get_le16(tlvs[ROCKER_TLV_RX_FRAG_MAX_LEN]);

    if (data_size > frag_max_len) {
        err = -ROCKER_EMSGSIZE;
        goto out;
    }

    if (copy_to_cpu) {
        rx_flags |= ROCKER_RX_FLAGS_FWD_OFFLOAD;
    }

    /* XXX calc rx flags/csum */

    tlv_size = rocker_tlv_total_size(sizeof(uint16_t)) + /* flags */
               rocker_tlv_total_size(sizeof(uint16_t)) + /* scum */
               rocker_tlv_total_size(sizeof(uint64_t)) + /* frag addr */
               rocker_tlv_total_size(sizeof(uint16_t)) + /* frag max len */
               rocker_tlv_total_size(sizeof(uint16_t));  /* frag len */

    if (tlv_size > desc_buf_size(info)) {
        err = -ROCKER_EMSGSIZE;
        goto out;
    }

    /* TODO:
     * iov dma write can be optimized in similar way e1000 does it in
     * e1000_receive_iov. But maybe if would make sense to introduce
     * generic helper iov_dma_write.
     */

    data = g_malloc(data_size);

    iov_to_buf(iov, iovcnt, 0, data, data_size);
    pci_dma_write(dev, frag_addr, data, data_size);
    g_free(data);

    pos = 0;
    rocker_tlv_put_le16(buf, &pos, ROCKER_TLV_RX_FLAGS, rx_flags);
    rocker_tlv_put_le16(buf, &pos, ROCKER_TLV_RX_CSUM, rx_csum);
    rocker_tlv_put_le64(buf, &pos, ROCKER_TLV_RX_FRAG_ADDR, frag_addr);
    rocker_tlv_put_le16(buf, &pos, ROCKER_TLV_RX_FRAG_MAX_LEN, frag_max_len);
    rocker_tlv_put_le16(buf, &pos, ROCKER_TLV_RX_FRAG_LEN, data_size);

    err = desc_set_buf(info, tlv_size);

out:
    if (desc_ring_post_desc(ring, err)) {
        rocker_msix_irq(r, ROCKER_MSIX_VEC_RX(pport - 1));
    }

    return err;
}

int rocker_port_eg(Rocker *r, uint32_t pport,
                   const struct iovec *iov, int iovcnt)
{
    FpPort *fp_port;
    uint32_t port;

    if (!fp_port_from_pport(pport, &port)) {
        return -ROCKER_EINVAL;
    }

    fp_port = r->fp_port[port];

    return fp_port_eg(fp_port, iov, iovcnt);
}

static void rocker_test_dma_ctrl(Rocker *r, uint32_t val)
{
    PCIDevice *dev = PCI_DEVICE(r);
    char *buf;
    int i;

    buf = g_malloc(r->test_dma_size);

    switch (val) {
    case ROCKER_TEST_DMA_CTRL_CLEAR:
        memset(buf, 0, r->test_dma_size);
        break;
    case ROCKER_TEST_DMA_CTRL_FILL:
        memset(buf, 0x96, r->test_dma_size);
        break;
    case ROCKER_TEST_DMA_CTRL_INVERT:
        pci_dma_read(dev, r->test_dma_addr, buf, r->test_dma_size);
        for (i = 0; i < r->test_dma_size; i++) {
            buf[i] = ~buf[i];
        }
        break;
    default:
        DPRINTF("not test dma control val=0x%08x\n", val);
        goto err_out;
    }
    pci_dma_write(dev, r->test_dma_addr, buf, r->test_dma_size);

    rocker_msix_irq(r, ROCKER_MSIX_VEC_TEST);

err_out:
    g_free(buf);
}

static void rocker_reset(DeviceState *dev);

static void rocker_control(Rocker *r, uint32_t val)
{
    if (val & ROCKER_CONTROL_RESET) {
        rocker_reset(DEVICE(r));
    }
}

static int rocker_pci_ring_count(Rocker *r)
{
    /* There are:
     * - command ring
     * - event ring
     * - tx and rx ring per each port
     */
    return 2 + (2 * r->fp_ports);
}

static bool rocker_addr_is_desc_reg(Rocker *r, hwaddr addr)
{
    hwaddr start = ROCKER_DMA_DESC_BASE;
    hwaddr end = start + (ROCKER_DMA_DESC_SIZE * rocker_pci_ring_count(r));

    return addr >= start && addr < end;
}

static void rocker_port_phys_enable_write(Rocker *r, uint64_t new)
{
    int i;
    bool old_enabled;
    bool new_enabled;
    FpPort *fp_port;

    for (i = 0; i < r->fp_ports; i++) {
        fp_port = r->fp_port[i];
        old_enabled = fp_port_enabled(fp_port);
        new_enabled = (new >> (i + 1)) & 0x1;
        if (new_enabled == old_enabled) {
            continue;
        }
        if (new_enabled) {
            fp_port_enable(r->fp_port[i]);
        } else {
            fp_port_disable(r->fp_port[i]);
        }
    }
}

static void rocker_io_writel(void *opaque, hwaddr addr, uint32_t val)
{
    Rocker *r = opaque;

    if (rocker_addr_is_desc_reg(r, addr)) {
        unsigned index = ROCKER_RING_INDEX(addr);
        unsigned offset = addr & ROCKER_DMA_DESC_MASK;

        switch (offset) {
        case ROCKER_DMA_DESC_ADDR_OFFSET:
            r->lower32 = (uint64_t)val;
            break;
        case ROCKER_DMA_DESC_ADDR_OFFSET + 4:
            desc_ring_set_base_addr(r->rings[index],
                                    ((uint64_t)val) << 32 | r->lower32);
            r->lower32 = 0;
            break;
        case ROCKER_DMA_DESC_SIZE_OFFSET:
            desc_ring_set_size(r->rings[index], val);
            break;
        case ROCKER_DMA_DESC_HEAD_OFFSET:
            if (desc_ring_set_head(r->rings[index], val)) {
                rocker_msix_irq(r, desc_ring_get_msix_vector(r->rings[index]));
            }
            break;
        case ROCKER_DMA_DESC_CTRL_OFFSET:
            desc_ring_set_ctrl(r->rings[index], val);
            break;
        case ROCKER_DMA_DESC_CREDITS_OFFSET:
            if (desc_ring_ret_credits(r->rings[index], val)) {
                rocker_msix_irq(r, desc_ring_get_msix_vector(r->rings[index]));
            }
            break;
        default:
            DPRINTF("not implemented dma reg write(l) addr=0x" TARGET_FMT_plx
                    " val=0x%08x (ring %d, addr=0x%02x)\n",
                    addr, val, index, offset);
            break;
        }
        return;
    }

    switch (addr) {
    case ROCKER_TEST_REG:
        r->test_reg = val;
        break;
    case ROCKER_TEST_REG64:
    case ROCKER_TEST_DMA_ADDR:
    case ROCKER_PORT_PHYS_ENABLE:
        r->lower32 = (uint64_t)val;
        break;
    case ROCKER_TEST_REG64 + 4:
        r->test_reg64 = ((uint64_t)val) << 32 | r->lower32;
        r->lower32 = 0;
        break;
    case ROCKER_TEST_IRQ:
        rocker_msix_irq(r, val);
        break;
    case ROCKER_TEST_DMA_SIZE:
        r->test_dma_size = val & 0xFFFF;
        break;
    case ROCKER_TEST_DMA_ADDR + 4:
        r->test_dma_addr = ((uint64_t)val) << 32 | r->lower32;
        r->lower32 = 0;
        break;
    case ROCKER_TEST_DMA_CTRL:
        rocker_test_dma_ctrl(r, val);
        break;
    case ROCKER_CONTROL:
        rocker_control(r, val);
        break;
    case ROCKER_PORT_PHYS_ENABLE + 4:
        rocker_port_phys_enable_write(r, ((uint64_t)val) << 32 | r->lower32);
        r->lower32 = 0;
        break;
    default:
        DPRINTF("not implemented write(l) addr=0x" TARGET_FMT_plx
                " val=0x%08x\n", addr, val);
        break;
    }
}

static void rocker_io_writeq(void *opaque, hwaddr addr, uint64_t val)
{
    Rocker *r = opaque;

    if (rocker_addr_is_desc_reg(r, addr)) {
        unsigned index = ROCKER_RING_INDEX(addr);
        unsigned offset = addr & ROCKER_DMA_DESC_MASK;

        switch (offset) {
        case ROCKER_DMA_DESC_ADDR_OFFSET:
            desc_ring_set_base_addr(r->rings[index], val);
            break;
        default:
            DPRINTF("not implemented dma reg write(q) addr=0x" TARGET_FMT_plx
                    " val=0x" TARGET_FMT_plx " (ring %d, offset=0x%02x)\n",
                    addr, val, index, offset);
            break;
        }
        return;
    }

    switch (addr) {
    case ROCKER_TEST_REG64:
        r->test_reg64 = val;
        break;
    case ROCKER_TEST_DMA_ADDR:
        r->test_dma_addr = val;
        break;
    case ROCKER_PORT_PHYS_ENABLE:
        rocker_port_phys_enable_write(r, val);
        break;
    default:
        DPRINTF("not implemented write(q) addr=0x" TARGET_FMT_plx
                " val=0x" TARGET_FMT_plx "\n", addr, val);
        break;
    }
}

#ifdef DEBUG_ROCKER
#define regname(reg) case (reg): return #reg
static const char *rocker_reg_name(void *opaque, hwaddr addr)
{
    Rocker *r = opaque;

    if (rocker_addr_is_desc_reg(r, addr)) {
        unsigned index = ROCKER_RING_INDEX(addr);
        unsigned offset = addr & ROCKER_DMA_DESC_MASK;
        static char buf[100];
        char ring_name[10];

        switch (index) {
        case 0:
            sprintf(ring_name, "cmd");
            break;
        case 1:
            sprintf(ring_name, "event");
            break;
        default:
            sprintf(ring_name, "%s-%d", index % 2 ? "rx" : "tx",
                    (index - 2) / 2);
        }

        switch (offset) {
        case ROCKER_DMA_DESC_ADDR_OFFSET:
            sprintf(buf, "Ring[%s] ADDR", ring_name);
            return buf;
        case ROCKER_DMA_DESC_ADDR_OFFSET+4:
            sprintf(buf, "Ring[%s] ADDR+4", ring_name);
            return buf;
        case ROCKER_DMA_DESC_SIZE_OFFSET:
            sprintf(buf, "Ring[%s] SIZE", ring_name);
            return buf;
        case ROCKER_DMA_DESC_HEAD_OFFSET:
            sprintf(buf, "Ring[%s] HEAD", ring_name);
            return buf;
        case ROCKER_DMA_DESC_TAIL_OFFSET:
            sprintf(buf, "Ring[%s] TAIL", ring_name);
            return buf;
        case ROCKER_DMA_DESC_CTRL_OFFSET:
            sprintf(buf, "Ring[%s] CTRL", ring_name);
            return buf;
        case ROCKER_DMA_DESC_CREDITS_OFFSET:
            sprintf(buf, "Ring[%s] CREDITS", ring_name);
            return buf;
        default:
            sprintf(buf, "Ring[%s] ???", ring_name);
            return buf;
        }
    } else {
        switch (addr) {
            regname(ROCKER_BOGUS_REG0);
            regname(ROCKER_BOGUS_REG1);
            regname(ROCKER_BOGUS_REG2);
            regname(ROCKER_BOGUS_REG3);
            regname(ROCKER_TEST_REG);
            regname(ROCKER_TEST_REG64);
            regname(ROCKER_TEST_REG64+4);
            regname(ROCKER_TEST_IRQ);
            regname(ROCKER_TEST_DMA_ADDR);
            regname(ROCKER_TEST_DMA_ADDR+4);
            regname(ROCKER_TEST_DMA_SIZE);
            regname(ROCKER_TEST_DMA_CTRL);
            regname(ROCKER_CONTROL);
            regname(ROCKER_PORT_PHYS_COUNT);
            regname(ROCKER_PORT_PHYS_LINK_STATUS);
            regname(ROCKER_PORT_PHYS_LINK_STATUS+4);
            regname(ROCKER_PORT_PHYS_ENABLE);
            regname(ROCKER_PORT_PHYS_ENABLE+4);
            regname(ROCKER_SWITCH_ID);
            regname(ROCKER_SWITCH_ID+4);
        }
    }
    return "???";
}
#else
static const char *rocker_reg_name(void *opaque, hwaddr addr)
{
    return NULL;
}
#endif

static void rocker_mmio_write(void *opaque, hwaddr addr, uint64_t val,
                              unsigned size)
{
    DPRINTF("Write %s addr " TARGET_FMT_plx
            ", size %u, val " TARGET_FMT_plx "\n",
            rocker_reg_name(opaque, addr), addr, size, val);

    switch (size) {
    case 4:
        rocker_io_writel(opaque, addr, val);
        break;
    case 8:
        rocker_io_writeq(opaque, addr, val);
        break;
    }
}

static uint64_t rocker_port_phys_link_status(Rocker *r)
{
    int i;
    uint64_t status = 0;

    for (i = 0; i < r->fp_ports; i++) {
        FpPort *port = r->fp_port[i];

        if (fp_port_get_link_up(port)) {
            status |= 1 << (i + 1);
        }
    }
    return status;
}

static uint64_t rocker_port_phys_enable_read(Rocker *r)
{
    int i;
    uint64_t ret = 0;

    for (i = 0; i < r->fp_ports; i++) {
        FpPort *port = r->fp_port[i];

        if (fp_port_enabled(port)) {
            ret |= 1 << (i + 1);
        }
    }
    return ret;
}

static uint32_t rocker_io_readl(void *opaque, hwaddr addr)
{
    Rocker *r = opaque;
    uint32_t ret;

    if (rocker_addr_is_desc_reg(r, addr)) {
        unsigned index = ROCKER_RING_INDEX(addr);
        unsigned offset = addr & ROCKER_DMA_DESC_MASK;

        switch (offset) {
        case ROCKER_DMA_DESC_ADDR_OFFSET:
            ret = (uint32_t)desc_ring_get_base_addr(r->rings[index]);
            break;
        case ROCKER_DMA_DESC_ADDR_OFFSET + 4:
            ret = (uint32_t)(desc_ring_get_base_addr(r->rings[index]) >> 32);
            break;
        case ROCKER_DMA_DESC_SIZE_OFFSET:
            ret = desc_ring_get_size(r->rings[index]);
            break;
        case ROCKER_DMA_DESC_HEAD_OFFSET:
            ret = desc_ring_get_head(r->rings[index]);
            break;
        case ROCKER_DMA_DESC_TAIL_OFFSET:
            ret = desc_ring_get_tail(r->rings[index]);
            break;
        case ROCKER_DMA_DESC_CREDITS_OFFSET:
            ret = desc_ring_get_credits(r->rings[index]);
            break;
        default:
            DPRINTF("not implemented dma reg read(l) addr=0x" TARGET_FMT_plx
                    " (ring %d, addr=0x%02x)\n", addr, index, offset);
            ret = 0;
            break;
        }
        return ret;
    }

    switch (addr) {
    case ROCKER_BOGUS_REG0:
    case ROCKER_BOGUS_REG1:
    case ROCKER_BOGUS_REG2:
    case ROCKER_BOGUS_REG3:
        ret = 0xDEADBABE;
        break;
    case ROCKER_TEST_REG:
        ret = r->test_reg * 2;
        break;
    case ROCKER_TEST_REG64:
        ret = (uint32_t)(r->test_reg64 * 2);
        break;
    case ROCKER_TEST_REG64 + 4:
        ret = (uint32_t)((r->test_reg64 * 2) >> 32);
        break;
    case ROCKER_TEST_DMA_SIZE:
        ret = r->test_dma_size;
        break;
    case ROCKER_TEST_DMA_ADDR:
        ret = (uint32_t)r->test_dma_addr;
        break;
    case ROCKER_TEST_DMA_ADDR + 4:
        ret = (uint32_t)(r->test_dma_addr >> 32);
        break;
    case ROCKER_PORT_PHYS_COUNT:
        ret = r->fp_ports;
        break;
    case ROCKER_PORT_PHYS_LINK_STATUS:
        ret = (uint32_t)rocker_port_phys_link_status(r);
        break;
    case ROCKER_PORT_PHYS_LINK_STATUS + 4:
        ret = (uint32_t)(rocker_port_phys_link_status(r) >> 32);
        break;
    case ROCKER_PORT_PHYS_ENABLE:
        ret = (uint32_t)rocker_port_phys_enable_read(r);
        break;
    case ROCKER_PORT_PHYS_ENABLE + 4:
        ret = (uint32_t)(rocker_port_phys_enable_read(r) >> 32);
        break;
    case ROCKER_SWITCH_ID:
        ret = (uint32_t)r->switch_id;
        break;
    case ROCKER_SWITCH_ID + 4:
        ret = (uint32_t)(r->switch_id >> 32);
        break;
    default:
        DPRINTF("not implemented read(l) addr=0x" TARGET_FMT_plx "\n", addr);
        ret = 0;
        break;
    }
    return ret;
}

static uint64_t rocker_io_readq(void *opaque, hwaddr addr)
{
    Rocker *r = opaque;
    uint64_t ret;

    if (rocker_addr_is_desc_reg(r, addr)) {
        unsigned index = ROCKER_RING_INDEX(addr);
        unsigned offset = addr & ROCKER_DMA_DESC_MASK;

        switch (addr & ROCKER_DMA_DESC_MASK) {
        case ROCKER_DMA_DESC_ADDR_OFFSET:
            ret = desc_ring_get_base_addr(r->rings[index]);
            break;
        default:
            DPRINTF("not implemented dma reg read(q) addr=0x" TARGET_FMT_plx
                    " (ring %d, addr=0x%02x)\n", addr, index, offset);
            ret = 0;
            break;
        }
        return ret;
    }

    switch (addr) {
    case ROCKER_BOGUS_REG0:
    case ROCKER_BOGUS_REG2:
        ret = 0xDEADBABEDEADBABEULL;
        break;
    case ROCKER_TEST_REG64:
        ret = r->test_reg64 * 2;
        break;
    case ROCKER_TEST_DMA_ADDR:
        ret = r->test_dma_addr;
        break;
    case ROCKER_PORT_PHYS_LINK_STATUS:
        ret = rocker_port_phys_link_status(r);
        break;
    case ROCKER_PORT_PHYS_ENABLE:
        ret = rocker_port_phys_enable_read(r);
        break;
    case ROCKER_SWITCH_ID:
        ret = r->switch_id;
        break;
    default:
        DPRINTF("not implemented read(q) addr=0x" TARGET_FMT_plx "\n", addr);
        ret = 0;
        break;
    }
    return ret;
}

static uint64_t rocker_mmio_read(void *opaque, hwaddr addr, unsigned size)
{
    DPRINTF("Read %s addr " TARGET_FMT_plx ", size %u\n",
            rocker_reg_name(opaque, addr), addr, size);

    switch (size) {
    case 4:
        return rocker_io_readl(opaque, addr);
    case 8:
        return rocker_io_readq(opaque, addr);
    }

    return -1;
}

static const MemoryRegionOps rocker_mmio_ops = {
    .read = rocker_mmio_read,
    .write = rocker_mmio_write,
    .endianness = DEVICE_LITTLE_ENDIAN,
    .valid = {
        .min_access_size = 4,
        .max_access_size = 8,
    },
    .impl = {
        .min_access_size = 4,
        .max_access_size = 8,
    },
};

static void rocker_msix_vectors_unuse(Rocker *r,
                                      unsigned int num_vectors)
{
    PCIDevice *dev = PCI_DEVICE(r);
    int i;

    for (i = 0; i < num_vectors; i++) {
        msix_vector_unuse(dev, i);
    }
}

static int rocker_msix_vectors_use(Rocker *r,
                                   unsigned int num_vectors)
{
    PCIDevice *dev = PCI_DEVICE(r);
    int err;
    int i;

    for (i = 0; i < num_vectors; i++) {
        err = msix_vector_use(dev, i);
        if (err) {
            goto rollback;
        }
    }
    return 0;

rollback:
    rocker_msix_vectors_unuse(r, i);
    return err;
}

static int rocker_msix_init(Rocker *r, Error **errp)
{
    PCIDevice *dev = PCI_DEVICE(r);
    int err;

    err = msix_init(dev, ROCKER_MSIX_VEC_COUNT(r->fp_ports),
                    &r->msix_bar,
                    ROCKER_PCI_MSIX_BAR_IDX, ROCKER_PCI_MSIX_TABLE_OFFSET,
                    &r->msix_bar,
                    ROCKER_PCI_MSIX_BAR_IDX, ROCKER_PCI_MSIX_PBA_OFFSET,
                    0, errp);
    if (err) {
        return err;
    }

    err = rocker_msix_vectors_use(r, ROCKER_MSIX_VEC_COUNT(r->fp_ports));
    if (err) {
        goto err_msix_vectors_use;
    }

    return 0;

err_msix_vectors_use:
    msix_uninit(dev, &r->msix_bar, &r->msix_bar);
    return err;
}

static void rocker_msix_uninit(Rocker *r)
{
    PCIDevice *dev = PCI_DEVICE(r);

    msix_uninit(dev, &r->msix_bar, &r->msix_bar);
    rocker_msix_vectors_unuse(r, ROCKER_MSIX_VEC_COUNT(r->fp_ports));
}

static World *rocker_world_type_by_name(Rocker *r, const char *name)
{
    int i;

    for (i = 0; i < ROCKER_WORLD_TYPE_MAX; i++) {
        if (strcmp(name, world_name(r->worlds[i])) == 0) {
            return r->worlds[i];
        }
    }
    return NULL;
}

static void pci_rocker_realize(PCIDevice *dev, Error **errp)
{
    Rocker *r = ROCKER(dev);
    const MACAddr zero = { .a = { 0, 0, 0, 0, 0, 0 } };
    const MACAddr dflt = { .a = { 0x52, 0x54, 0x00, 0x12, 0x35, 0x01 } };
    static int sw_index;
    int i, err = 0;

    /* allocate worlds */

    r->worlds[ROCKER_WORLD_TYPE_OF_DPA] = of_dpa_world_alloc(r);

    if (!r->world_name) {
        r->world_name = g_strdup(world_name(r->worlds[ROCKER_WORLD_TYPE_OF_DPA]));
    }

    r->world_dflt = rocker_world_type_by_name(r, r->world_name);
    if (!r->world_dflt) {
        error_setg(errp,
                "invalid argument requested world %s does not exist",
                r->world_name);
        goto err_world_type_by_name;
    }

    /* set up memory-mapped region at BAR0 */

    memory_region_init_io(&r->mmio, OBJECT(r), &rocker_mmio_ops, r,
                          "rocker-mmio", ROCKER_PCI_BAR0_SIZE);
    pci_register_bar(dev, ROCKER_PCI_BAR0_IDX,
                     PCI_BASE_ADDRESS_SPACE_MEMORY, &r->mmio);

    /* set up memory-mapped region for MSI-X */

    memory_region_init(&r->msix_bar, OBJECT(r), "rocker-msix-bar",
                       ROCKER_PCI_MSIX_BAR_SIZE);
    pci_register_bar(dev, ROCKER_PCI_MSIX_BAR_IDX,
                     PCI_BASE_ADDRESS_SPACE_MEMORY, &r->msix_bar);

    /* MSI-X init */

    err = rocker_msix_init(r, errp);
    if (err) {
        goto err_msix_init;
    }

    /* validate switch properties */

    if (!r->name) {
        r->name = g_strdup(TYPE_ROCKER);
    }

    if (rocker_find(r->name)) {
        error_setg(errp, "%s already exists", r->name);
        goto err_duplicate;
    }

    /* Rocker name is passed in port name requests to OS with the intention
     * that the name is used in interface names. Limit the length of the
     * rocker name to avoid naming problems in the OS. Also, adding the
     * port number as p# and unganged breakout b#, where # is at most 2
     * digits, so leave room for it too (-1 for string terminator, -3 for
     * p# and -3 for b#)
     */
#define ROCKER_IFNAMSIZ 16
#define MAX_ROCKER_NAME_LEN  (ROCKER_IFNAMSIZ - 1 - 3 - 3)
    if (strlen(r->name) > MAX_ROCKER_NAME_LEN) {
        error_setg(errp,
                "name too long; please shorten to at most %d chars",
                MAX_ROCKER_NAME_LEN);
        goto err_name_too_long;
    }

    if (memcmp(&r->fp_start_macaddr, &zero, sizeof(zero)) == 0) {
        memcpy(&r->fp_start_macaddr, &dflt, sizeof(dflt));
        r->fp_start_macaddr.a[4] += (sw_index++);
    }

    if (!r->switch_id) {
        memcpy(&r->switch_id, &r->fp_start_macaddr,
               sizeof(r->fp_start_macaddr));
    }

    if (r->fp_ports > ROCKER_FP_PORTS_MAX) {
        r->fp_ports = ROCKER_FP_PORTS_MAX;
    }

    r->rings = g_new(DescRing *, rocker_pci_ring_count(r));

    /* Rings are ordered like this:
     * - command ring
     * - event ring
     * - port0 tx ring
     * - port0 rx ring
     * - port1 tx ring
     * - port1 rx ring
     * .....
     */

    for (i = 0; i < rocker_pci_ring_count(r); i++) {
        DescRing *ring = desc_ring_alloc(r, i);

        if (i == ROCKER_RING_CMD) {
            desc_ring_set_consume(ring, cmd_consume, ROCKER_MSIX_VEC_CMD);
        } else if (i == ROCKER_RING_EVENT) {
            desc_ring_set_consume(ring, NULL, ROCKER_MSIX_VEC_EVENT);
        } else if (i % 2 == 0) {
            desc_ring_set_consume(ring, tx_consume,
                                  ROCKER_MSIX_VEC_TX((i - 2) / 2));
        } else if (i % 2 == 1) {
            desc_ring_set_consume(ring, NULL, ROCKER_MSIX_VEC_RX((i - 3) / 2));
        }

        r->rings[i] = ring;
    }

    for (i = 0; i < r->fp_ports; i++) {
        FpPort *port =
            fp_port_alloc(r, r->name, &r->fp_start_macaddr,
                          i, &r->fp_ports_peers[i]);

        r->fp_port[i] = port;
        fp_port_set_world(port, r->world_dflt);
    }

    QLIST_INSERT_HEAD(&rockers, r, next);

    return;

err_name_too_long:
err_duplicate:
    rocker_msix_uninit(r);
err_msix_init:
    object_unparent(OBJECT(&r->msix_bar));
    object_unparent(OBJECT(&r->mmio));
err_world_type_by_name:
    for (i = 0; i < ROCKER_WORLD_TYPE_MAX; i++) {
        if (r->worlds[i]) {
            world_free(r->worlds[i]);
        }
    }
}

static void pci_rocker_uninit(PCIDevice *dev)
{
    Rocker *r = ROCKER(dev);
    int i;

    QLIST_REMOVE(r, next);

    for (i = 0; i < r->fp_ports; i++) {
        FpPort *port = r->fp_port[i];

        fp_port_free(port);
        r->fp_port[i] = NULL;
    }

    for (i = 0; i < rocker_pci_ring_count(r); i++) {
        if (r->rings[i]) {
            desc_ring_free(r->rings[i]);
        }
    }
    g_free(r->rings);

    rocker_msix_uninit(r);
    object_unparent(OBJECT(&r->msix_bar));
    object_unparent(OBJECT(&r->mmio));

    for (i = 0; i < ROCKER_WORLD_TYPE_MAX; i++) {
        if (r->worlds[i]) {
            world_free(r->worlds[i]);
        }
    }
    g_free(r->fp_ports_peers);
}

static void rocker_reset(DeviceState *dev)
{
    Rocker *r = ROCKER(dev);
    int i;

    for (i = 0; i < ROCKER_WORLD_TYPE_MAX; i++) {
        if (r->worlds[i]) {
            world_reset(r->worlds[i]);
        }
    }
    for (i = 0; i < r->fp_ports; i++) {
        fp_port_reset(r->fp_port[i]);
        fp_port_set_world(r->fp_port[i], r->world_dflt);
    }

    r->test_reg = 0;
    r->test_reg64 = 0;
    r->test_dma_addr = 0;
    r->test_dma_size = 0;

    for (i = 0; i < rocker_pci_ring_count(r); i++) {
        desc_ring_reset(r->rings[i]);
    }

    DPRINTF("Reset done\n");
}

static Property rocker_properties[] = {
    DEFINE_PROP_STRING("name", Rocker, name),
    DEFINE_PROP_STRING("world", Rocker, world_name),
    DEFINE_PROP_MACADDR("fp_start_macaddr", Rocker,
                        fp_start_macaddr),
    DEFINE_PROP_UINT64("switch_id", Rocker,
                       switch_id, 0),
    DEFINE_PROP_ARRAY("ports", Rocker, fp_ports,
                      fp_ports_peers, qdev_prop_netdev, NICPeers),
    DEFINE_PROP_END_OF_LIST(),
};

static const VMStateDescription rocker_vmsd = {
    .name = TYPE_ROCKER,
    .unmigratable = 1,
};

static void rocker_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    k->realize = pci_rocker_realize;
    k->exit = pci_rocker_uninit;
    k->vendor_id = PCI_VENDOR_ID_REDHAT;
    k->device_id = PCI_DEVICE_ID_REDHAT_ROCKER;
    k->revision = ROCKER_PCI_REVISION;
    k->class_id = PCI_CLASS_NETWORK_OTHER;
    set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
    dc->desc = "Rocker Switch";
    dc->reset = rocker_reset;
    dc->props = rocker_properties;
    dc->vmsd = &rocker_vmsd;
}

static const TypeInfo rocker_info = {
    .name          = TYPE_ROCKER,
    .parent        = TYPE_PCI_DEVICE,
    .instance_size = sizeof(Rocker),
    .class_init    = rocker_class_init,
    .interfaces = (InterfaceInfo[]) {
        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
        { },
    },
};

static void rocker_register_types(void)
{
    type_register_static(&rocker_info);
}

type_init(rocker_register_types)