// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * drivers/net/ethernet/rocker/rocker.c - Rocker switch device driver
 * Copyright (c) 2014-2016 Jiri Pirko <jiri@mellanox.com>
 * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/sort.h>
#include <linux/random.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/if_bridge.h>
#include <linux/bitops.h>
#include <linux/ctype.h>
#include <linux/workqueue.h>
#include <net/switchdev.h>
#include <net/rtnetlink.h>
#include <net/netevent.h>
#include <net/arp.h>
#include <net/fib_rules.h>
#include <net/fib_notifier.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <generated/utsrelease.h>

#include "rocker_hw.h"
#include "rocker.h"
#include "rocker_tlv.h"

static const char rocker_driver_name[] = "rocker";

static const struct pci_device_id rocker_pci_id_table[] = {
        {PCI_VDEVICE(REDHAT, PCI_DEVICE_ID_REDHAT_ROCKER), 0},
        {0, }
};

struct rocker_wait {
        wait_queue_head_t wait;
        bool done;
        bool nowait;
};

static void rocker_wait_reset(struct rocker_wait *wait)
{
        wait->done = false;
        wait->nowait = false;
}

static void rocker_wait_init(struct rocker_wait *wait)
{
        init_waitqueue_head(&wait->wait);
        rocker_wait_reset(wait);
}

static struct rocker_wait *rocker_wait_create(void)
{
        struct rocker_wait *wait;

        wait = kzalloc(sizeof(*wait), GFP_KERNEL);
        if (!wait)
                return NULL;
        return wait;
}

static void rocker_wait_destroy(struct rocker_wait *wait)
{
        kfree(wait);
}

static bool rocker_wait_event_timeout(struct rocker_wait *wait,
                                      unsigned long timeout)
{
        wait_event_timeout(wait->wait, wait->done, HZ / 10);
        if (!wait->done)
                return false;
        return true;
}

static void rocker_wait_wake_up(struct rocker_wait *wait)
{
        wait->done = true;
        wake_up(&wait->wait);
}

static u32 rocker_msix_vector(const struct rocker *rocker, unsigned int vector)
{
        return rocker->msix_entries[vector].vector;
}

static u32 rocker_msix_tx_vector(const struct rocker_port *rocker_port)
{
        return rocker_msix_vector(rocker_port->rocker,
                                  ROCKER_MSIX_VEC_TX(rocker_port->port_number));
}

static u32 rocker_msix_rx_vector(const struct rocker_port *rocker_port)
{
        return rocker_msix_vector(rocker_port->rocker,
                                  ROCKER_MSIX_VEC_RX(rocker_port->port_number));
}

#define rocker_write32(rocker, reg, val)        \
        writel((val), (rocker)->hw_addr + (ROCKER_ ## reg))
#define rocker_read32(rocker, reg)      \
        readl((rocker)->hw_addr + (ROCKER_ ## reg))
#define rocker_write64(rocker, reg, val)        \
        writeq((val), (rocker)->hw_addr + (ROCKER_ ## reg))
#define rocker_read64(rocker, reg)      \
        readq((rocker)->hw_addr + (ROCKER_ ## reg))

/*****************************
 * HW basic testing functions
 *****************************/

static int rocker_reg_test(const struct rocker *rocker)
{
        const struct pci_dev *pdev = rocker->pdev;
        u64 test_reg;
        u64 rnd;

        rnd = prandom_u32();
        rnd >>= 1;
        rocker_write32(rocker, TEST_REG, rnd);
        test_reg = rocker_read32(rocker, TEST_REG);
        if (test_reg != rnd * 2) {
                dev_err(&pdev->dev, "unexpected 32bit register value %08llx, expected %08llx\n",
                        test_reg, rnd * 2);
                return -EIO;
        }

        rnd = prandom_u32();
        rnd <<= 31;
        rnd |= prandom_u32();
        rocker_write64(rocker, TEST_REG64, rnd);
        test_reg = rocker_read64(rocker, TEST_REG64);
        if (test_reg != rnd * 2) {
                dev_err(&pdev->dev, "unexpected 64bit register value %16llx, expected %16llx\n",
                        test_reg, rnd * 2);
                return -EIO;
        }

        return 0;
}

static int rocker_dma_test_one(const struct rocker *rocker,
                               struct rocker_wait *wait, u32 test_type,
                               dma_addr_t dma_handle, const unsigned char *buf,
                               const unsigned char *expect, size_t size)
{
        const struct pci_dev *pdev = rocker->pdev;
        int i;

        rocker_wait_reset(wait);
        rocker_write32(rocker, TEST_DMA_CTRL, test_type);

        if (!rocker_wait_event_timeout(wait, HZ / 10)) {
                dev_err(&pdev->dev, "no interrupt received within a timeout\n");
                return -EIO;
        }

        for (i = 0; i < size; i++) {
                if (buf[i] != expect[i]) {
                        dev_err(&pdev->dev, "unexpected memory content %02x at byte %x\n, %02x expected",
                                buf[i], i, expect[i]);
                        return -EIO;
                }
        }
        return 0;
}

#define ROCKER_TEST_DMA_BUF_SIZE (PAGE_SIZE * 4)
#define ROCKER_TEST_DMA_FILL_PATTERN 0x96

static int rocker_dma_test_offset(const struct rocker *rocker,
                                  struct rocker_wait *wait, int offset)
{
        struct pci_dev *pdev = rocker->pdev;
        unsigned char *alloc;
        unsigned char *buf;
        unsigned char *expect;
        dma_addr_t dma_handle;
        int i;
        int err;

        alloc = kzalloc(ROCKER_TEST_DMA_BUF_SIZE * 2 + offset,
                        GFP_KERNEL | GFP_DMA);
        if (!alloc)
                return -ENOMEM;
        buf = alloc + offset;
        expect = buf + ROCKER_TEST_DMA_BUF_SIZE;

        dma_handle = dma_map_single(&pdev->dev, buf, ROCKER_TEST_DMA_BUF_SIZE,
                                    DMA_BIDIRECTIONAL);
        if (dma_mapping_error(&pdev->dev, dma_handle)) {
                err = -EIO;
                goto free_alloc;
        }

        rocker_write64(rocker, TEST_DMA_ADDR, dma_handle);
        rocker_write32(rocker, TEST_DMA_SIZE, ROCKER_TEST_DMA_BUF_SIZE);

        memset(expect, ROCKER_TEST_DMA_FILL_PATTERN, ROCKER_TEST_DMA_BUF_SIZE);
        err = rocker_dma_test_one(rocker, wait, ROCKER_TEST_DMA_CTRL_FILL,
                                  dma_handle, buf, expect,
                                  ROCKER_TEST_DMA_BUF_SIZE);
        if (err)
                goto unmap;

        memset(expect, 0, ROCKER_TEST_DMA_BUF_SIZE);
        err = rocker_dma_test_one(rocker, wait, ROCKER_TEST_DMA_CTRL_CLEAR,
                                  dma_handle, buf, expect,
                                  ROCKER_TEST_DMA_BUF_SIZE);
        if (err)
                goto unmap;

        prandom_bytes(buf, ROCKER_TEST_DMA_BUF_SIZE);
        for (i = 0; i < ROCKER_TEST_DMA_BUF_SIZE; i++)
                expect[i] = ~buf[i];
        err = rocker_dma_test_one(rocker, wait, ROCKER_TEST_DMA_CTRL_INVERT,
                                  dma_handle, buf, expect,
                                  ROCKER_TEST_DMA_BUF_SIZE);
        if (err)
                goto unmap;

unmap:
        dma_unmap_single(&pdev->dev, dma_handle, ROCKER_TEST_DMA_BUF_SIZE,
                         DMA_BIDIRECTIONAL);
free_alloc:
        kfree(alloc);

        return err;
}

static int rocker_dma_test(const struct rocker *rocker,
                           struct rocker_wait *wait)
{
        int i;
        int err;

        for (i = 0; i < 8; i++) {
                err = rocker_dma_test_offset(rocker, wait, i);
                if (err)
                        return err;
        }
        return 0;
}

static irqreturn_t rocker_test_irq_handler(int irq, void *dev_id)
{
        struct rocker_wait *wait = dev_id;

        rocker_wait_wake_up(wait);

        return IRQ_HANDLED;
}

static int rocker_basic_hw_test(const struct rocker *rocker)
{
        const struct pci_dev *pdev = rocker->pdev;
        struct rocker_wait wait;
        int err;

        err = rocker_reg_test(rocker);
        if (err) {
                dev_err(&pdev->dev, "reg test failed\n");
                return err;
        }

        err = request_irq(rocker_msix_vector(rocker, ROCKER_MSIX_VEC_TEST),
                          rocker_test_irq_handler, 0,
                          rocker_driver_name, &wait);
        if (err) {
                dev_err(&pdev->dev, "cannot assign test irq\n");
                return err;
        }

        rocker_wait_init(&wait);
        rocker_write32(rocker, TEST_IRQ, ROCKER_MSIX_VEC_TEST);

        if (!rocker_wait_event_timeout(&wait, HZ / 10)) {
                dev_err(&pdev->dev, "no interrupt received within a timeout\n");
                err = -EIO;
                goto free_irq;
        }

        err = rocker_dma_test(rocker, &wait);
        if (err)
                dev_err(&pdev->dev, "dma test failed\n");

free_irq:
        free_irq(rocker_msix_vector(rocker, ROCKER_MSIX_VEC_TEST), &wait);
        return err;
}

/******************************************
 * DMA rings and descriptors manipulations
 ******************************************/

static u32 __pos_inc(u32 pos, size_t limit)
{
        return ++pos == limit ? 0 : pos;
}

static int rocker_desc_err(const struct rocker_desc_info *desc_info)
{
        int err = desc_info->desc->comp_err & ~ROCKER_DMA_DESC_COMP_ERR_GEN;

        switch (err) {
        case ROCKER_OK:
                return 0;
        case -ROCKER_ENOENT:
                return -ENOENT;
        case -ROCKER_ENXIO:
                return -ENXIO;
        case -ROCKER_ENOMEM:
                return -ENOMEM;
        case -ROCKER_EEXIST:
                return -EEXIST;
        case -ROCKER_EINVAL:
                return -EINVAL;
        case -ROCKER_EMSGSIZE:
                return -EMSGSIZE;
        case -ROCKER_ENOTSUP:
                return -EOPNOTSUPP;
        case -ROCKER_ENOBUFS:
                return -ENOBUFS;
        }

        return -EINVAL;
}

static void rocker_desc_gen_clear(const struct rocker_desc_info *desc_info)
{
        desc_info->desc->comp_err &= ~ROCKER_DMA_DESC_COMP_ERR_GEN;
}

static bool rocker_desc_gen(const struct rocker_desc_info *desc_info)
{
        u32 comp_err = desc_info->desc->comp_err;

        return comp_err & ROCKER_DMA_DESC_COMP_ERR_GEN ? true : false;
}

static void *
rocker_desc_cookie_ptr_get(const struct rocker_desc_info *desc_info)
{
        return (void *)(uintptr_t)desc_info->desc->cookie;
}

static void rocker_desc_cookie_ptr_set(const struct rocker_desc_info *desc_info,
                                       void *ptr)
{
        desc_info->desc->cookie = (uintptr_t) ptr;
}

static struct rocker_desc_info *
rocker_desc_head_get(const struct rocker_dma_ring_info *info)
{
        struct rocker_desc_info *desc_info;
        u32 head = __pos_inc(info->head, info->size);

        desc_info = &info->desc_info[info->head];
        if (head == info->tail)
                return NULL; /* ring full */
        desc_info->tlv_size = 0;
        return desc_info;
}

static void rocker_desc_commit(const struct rocker_desc_info *desc_info)
{
        desc_info->desc->buf_size = desc_info->data_size;
        desc_info->desc->tlv_size = desc_info->tlv_size;
}

static void rocker_desc_head_set(const struct rocker *rocker,
                                 struct rocker_dma_ring_info *info,
                                 const struct rocker_desc_info *desc_info)
{
        u32 head = __pos_inc(info->head, info->size);

        BUG_ON(head == info->tail);
        rocker_desc_commit(desc_info);
        info->head = head;
        rocker_write32(rocker, DMA_DESC_HEAD(info->type), head);
}

static struct rocker_desc_info *
rocker_desc_tail_get(struct rocker_dma_ring_info *info)
{
        struct rocker_desc_info *desc_info;

        if (info->tail == info->head)
                return NULL; /* nothing to be done between head and tail */
        desc_info = &info->desc_info[info->tail];
        if (!rocker_desc_gen(desc_info))
                return NULL; /* gen bit not set, desc is not ready yet */
        info->tail = __pos_inc(info->tail, info->size);
        desc_info->tlv_size = desc_info->desc->tlv_size;
        return desc_info;
}

static void rocker_dma_ring_credits_set(const struct rocker *rocker,
                                        const struct rocker_dma_ring_info *info,
                                        u32 credits)
{
        if (credits)
                rocker_write32(rocker, DMA_DESC_CREDITS(info->type), credits);
}

static unsigned long rocker_dma_ring_size_fix(size_t size)
{
        return max(ROCKER_DMA_SIZE_MIN,
                   min(roundup_pow_of_two(size), ROCKER_DMA_SIZE_MAX));
}

static int rocker_dma_ring_create(const struct rocker *rocker,
                                  unsigned int type,
                                  size_t size,
                                  struct rocker_dma_ring_info *info)
{
        int i;

        BUG_ON(size != rocker_dma_ring_size_fix(size));
        info->size = size;
        info->type = type;
        info->head = 0;
        info->tail = 0;
        info->desc_info = kcalloc(info->size, sizeof(*info->desc_info),
                                  GFP_KERNEL);
        if (!info->desc_info)
                return -ENOMEM;

        info->desc = dma_alloc_coherent(&rocker->pdev->dev,
                                        info->size * sizeof(*info->desc),
                                        &info->mapaddr, GFP_KERNEL);
        if (!info->desc) {
                kfree(info->desc_info);
                return -ENOMEM;
        }

        for (i = 0; i < info->size; i++)
                info->desc_info[i].desc = &info->desc[i];

        rocker_write32(rocker, DMA_DESC_CTRL(info->type),
                       ROCKER_DMA_DESC_CTRL_RESET);
        rocker_write64(rocker, DMA_DESC_ADDR(info->type), info->mapaddr);
        rocker_write32(rocker, DMA_DESC_SIZE(info->type), info->size);

        return 0;
}

static void rocker_dma_ring_destroy(const struct rocker *rocker,
                                    const struct rocker_dma_ring_info *info)
{
        rocker_write64(rocker, DMA_DESC_ADDR(info->type), 0);

        dma_free_coherent(&rocker->pdev->dev,
                          info->size * sizeof(struct rocker_desc), info->desc,
                          info->mapaddr);
        kfree(info->desc_info);
}

static void rocker_dma_ring_pass_to_producer(const struct rocker *rocker,
                                             struct rocker_dma_ring_info *info)
{
        int i;

        BUG_ON(info->head || info->tail);

        /* When ring is consumer, we need to advance head for each desc.
         * That tells hw that the desc is ready to be used by it.
         */
        for (i = 0; i < info->size - 1; i++)
                rocker_desc_head_set(rocker, info, &info->desc_info[i]);
        rocker_desc_commit(&info->desc_info[i]);
}

static int rocker_dma_ring_bufs_alloc(const struct rocker *rocker,
                                      const struct rocker_dma_ring_info *info,
                                      int direction, size_t buf_size)
{
        struct pci_dev *pdev = rocker->pdev;
        int i;
        int err;

        for (i = 0; i < info->size; i++) {
                struct rocker_desc_info *desc_info = &info->desc_info[i];
                struct rocker_desc *desc = &info->desc[i];
                dma_addr_t dma_handle;
                char *buf;

                buf = kzalloc(buf_size, GFP_KERNEL | GFP_DMA);
                if (!buf) {
                        err = -ENOMEM;
                        goto rollback;
                }

                dma_handle = dma_map_single(&pdev->dev, buf, buf_size,
                                            direction);
                if (dma_mapping_error(&pdev->dev, dma_handle)) {
                        kfree(buf);
                        err = -EIO;
                        goto rollback;
                }

                desc_info->data = buf;
                desc_info->data_size = buf_size;
                dma_unmap_addr_set(desc_info, mapaddr, dma_handle);

                desc->buf_addr = dma_handle;
                desc->buf_size = buf_size;
        }
        return 0;

rollback:
        for (i--; i >= 0; i--) {
                const struct rocker_desc_info *desc_info = &info->desc_info[i];

                dma_unmap_single(&pdev->dev,
                                 dma_unmap_addr(desc_info, mapaddr),
                                 desc_info->data_size, direction);
                kfree(desc_info->data);
        }
        return err;
}

static void rocker_dma_ring_bufs_free(const struct rocker *rocker,
                                      const struct rocker_dma_ring_info *info,
                                      int direction)
{
        struct pci_dev *pdev = rocker->pdev;
        int i;

        for (i = 0; i < info->size; i++) {
                const struct rocker_desc_info *desc_info = &info->desc_info[i];
                struct rocker_desc *desc = &info->desc[i];

                desc->buf_addr = 0;
                desc->buf_size = 0;
                dma_unmap_single(&pdev->dev,
                                 dma_unmap_addr(desc_info, mapaddr),
                                 desc_info->data_size, direction);
                kfree(desc_info->data);
        }
}

static int rocker_dma_cmd_ring_wait_alloc(struct rocker_desc_info *desc_info)
{
        struct rocker_wait *wait;

        wait = rocker_wait_create();
        if (!wait)
                return -ENOMEM;
        rocker_desc_cookie_ptr_set(desc_info, wait);
        return 0;
}

static void
rocker_dma_cmd_ring_wait_free(const struct rocker_desc_info *desc_info)
{
        struct rocker_wait *wait = rocker_desc_cookie_ptr_get(desc_info);

        rocker_wait_destroy(wait);
}

static int rocker_dma_cmd_ring_waits_alloc(const struct rocker *rocker)
{
        const struct rocker_dma_ring_info *cmd_ring = &rocker->cmd_ring;
        int i;
        int err;

        for (i = 0; i < cmd_ring->size; i++) {
                err = rocker_dma_cmd_ring_wait_alloc(&cmd_ring->desc_info[i]);
                if (err)
                        goto rollback;
        }
        return 0;

rollback:
        for (i--; i >= 0; i--)
                rocker_dma_cmd_ring_wait_free(&cmd_ring->desc_info[i]);
        return err;
}

static void rocker_dma_cmd_ring_waits_free(const struct rocker *rocker)
{
        const struct rocker_dma_ring_info *cmd_ring = &rocker->cmd_ring;
        int i;

        for (i = 0; i < cmd_ring->size; i++)
                rocker_dma_cmd_ring_wait_free(&cmd_ring->desc_info[i]);
}

static int rocker_dma_rings_init(struct rocker *rocker)
{
        const struct pci_dev *pdev = rocker->pdev;
        int err;

        err = rocker_dma_ring_create(rocker, ROCKER_DMA_CMD,
                                     ROCKER_DMA_CMD_DEFAULT_SIZE,
                                     &rocker->cmd_ring);
        if (err) {
                dev_err(&pdev->dev, "failed to create command dma ring\n");
                return err;
        }

        spin_lock_init(&rocker->cmd_ring_lock);

        err = rocker_dma_ring_bufs_alloc(rocker, &rocker->cmd_ring,
                                         DMA_BIDIRECTIONAL, PAGE_SIZE);
        if (err) {
                dev_err(&pdev->dev, "failed to alloc command dma ring buffers\n");
                goto err_dma_cmd_ring_bufs_alloc;
        }

        err = rocker_dma_cmd_ring_waits_alloc(rocker);
        if (err) {
                dev_err(&pdev->dev, "failed to alloc command dma ring waits\n");
                goto err_dma_cmd_ring_waits_alloc;
        }

        err = rocker_dma_ring_create(rocker, ROCKER_DMA_EVENT,
                                     ROCKER_DMA_EVENT_DEFAULT_SIZE,
                                     &rocker->event_ring);
        if (err) {
                dev_err(&pdev->dev, "failed to create event dma ring\n");
                goto err_dma_event_ring_create;
        }

        err = rocker_dma_ring_bufs_alloc(rocker, &rocker->event_ring,
                                         DMA_FROM_DEVICE, PAGE_SIZE);
        if (err) {
                dev_err(&pdev->dev, "failed to alloc event dma ring buffers\n");
                goto err_dma_event_ring_bufs_alloc;
        }
        rocker_dma_ring_pass_to_producer(rocker, &rocker->event_ring);
        return 0;

err_dma_event_ring_bufs_alloc:
        rocker_dma_ring_destroy(rocker, &rocker->event_ring);
err_dma_event_ring_create:
        rocker_dma_cmd_ring_waits_free(rocker);
err_dma_cmd_ring_waits_alloc:
        rocker_dma_ring_bufs_free(rocker, &rocker->cmd_ring,
                                  DMA_BIDIRECTIONAL);
err_dma_cmd_ring_bufs_alloc:
        rocker_dma_ring_destroy(rocker, &rocker->cmd_ring);
        return err;
}

static void rocker_dma_rings_fini(struct rocker *rocker)
{
        rocker_dma_ring_bufs_free(rocker, &rocker->event_ring,
                                  DMA_BIDIRECTIONAL);
        rocker_dma_ring_destroy(rocker, &rocker->event_ring);
        rocker_dma_cmd_ring_waits_free(rocker);
        rocker_dma_ring_bufs_free(rocker, &rocker->cmd_ring,
                                  DMA_BIDIRECTIONAL);
        rocker_dma_ring_destroy(rocker, &rocker->cmd_ring);
}

static int rocker_dma_rx_ring_skb_map(const struct rocker_port *rocker_port,
                                      struct rocker_desc_info *desc_info,
                                      struct sk_buff *skb, size_t buf_len)
{
        const struct rocker *rocker = rocker_port->rocker;
        struct pci_dev *pdev = rocker->pdev;
        dma_addr_t dma_handle;

        dma_handle = dma_map_single(&pdev->dev, skb->data, buf_len,
                                    DMA_FROM_DEVICE);
        if (dma_mapping_error(&pdev->dev, dma_handle))
                return -EIO;
        if (rocker_tlv_put_u64(desc_info, ROCKER_TLV_RX_FRAG_ADDR, dma_handle))
                goto tlv_put_failure;
        if (rocker_tlv_put_u16(desc_info, ROCKER_TLV_RX_FRAG_MAX_LEN, buf_len))
                goto tlv_put_failure;
        return 0;

tlv_put_failure:
        dma_unmap_single(&pdev->dev, dma_handle, buf_len, DMA_FROM_DEVICE);
        desc_info->tlv_size = 0;
        return -EMSGSIZE;
}

static size_t rocker_port_rx_buf_len(const struct rocker_port *rocker_port)
{
        return rocker_port->dev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
}

static int rocker_dma_rx_ring_skb_alloc(const struct rocker_port *rocker_port,
                                        struct rocker_desc_info *desc_info)
{
        struct net_device *dev = rocker_port->dev;
        struct sk_buff *skb;
        size_t buf_len = rocker_port_rx_buf_len(rocker_port);
        int err;

        /* Ensure that hw will see tlv_size zero in case of an error.
         * That tells hw to use another descriptor.
         */
        rocker_desc_cookie_ptr_set(desc_info, NULL);
        desc_info->tlv_size = 0;

        skb = netdev_alloc_skb_ip_align(dev, buf_len);
        if (!skb)
                return -ENOMEM;
        err = rocker_dma_rx_ring_skb_map(rocker_port, desc_info, skb, buf_len);
        if (err) {
                dev_kfree_skb_any(skb);
                return err;
        }
        rocker_desc_cookie_ptr_set(desc_info, skb);
        return 0;
}

static void rocker_dma_rx_ring_skb_unmap(const struct rocker *rocker,
                                         const struct rocker_tlv **attrs)
{
        struct pci_dev *pdev = rocker->pdev;
        dma_addr_t dma_handle;
        size_t len;

        if (!attrs[ROCKER_TLV_RX_FRAG_ADDR] ||
            !attrs[ROCKER_TLV_RX_FRAG_MAX_LEN])
                return;
        dma_handle = rocker_tlv_get_u64(attrs[ROCKER_TLV_RX_FRAG_ADDR]);
        len = rocker_tlv_get_u16(attrs[ROCKER_TLV_RX_FRAG_MAX_LEN]);
        dma_unmap_single(&pdev->dev, dma_handle, len, DMA_FROM_DEVICE);
}

static void rocker_dma_rx_ring_skb_free(const struct rocker *rocker,
                                        const struct rocker_desc_info *desc_info)
{
        const struct rocker_tlv *attrs[ROCKER_TLV_RX_MAX + 1];
        struct sk_buff *skb = rocker_desc_cookie_ptr_get(desc_info);

        if (!skb)
                return;
        rocker_tlv_parse_desc(attrs, ROCKER_TLV_RX_MAX, desc_info);
        rocker_dma_rx_ring_skb_unmap(rocker, attrs);
        dev_kfree_skb_any(skb);
}

static int rocker_dma_rx_ring_skbs_alloc(const struct rocker_port *rocker_port)
{
        const struct rocker_dma_ring_info *rx_ring = &rocker_port->rx_ring;
        const struct rocker *rocker = rocker_port->rocker;
        int i;
        int err;

        for (i = 0; i < rx_ring->size; i++) {
                err = rocker_dma_rx_ring_skb_alloc(rocker_port,
                                                   &rx_ring->desc_info[i]);
                if (err)
                        goto rollback;
        }
        return 0;

rollback:
        for (i--; i >= 0; i--)
                rocker_dma_rx_ring_skb_free(rocker, &rx_ring->desc_info[i]);
        return err;
}

static void rocker_dma_rx_ring_skbs_free(const struct rocker_port *rocker_port)
{
        const struct rocker_dma_ring_info *rx_ring = &rocker_port->rx_ring;
        const struct rocker *rocker = rocker_port->rocker;
        int i;

        for (i = 0; i < rx_ring->size; i++)
                rocker_dma_rx_ring_skb_free(rocker, &rx_ring->desc_info[i]);
}

static int rocker_port_dma_rings_init(struct rocker_port *rocker_port)
{
        struct rocker *rocker = rocker_port->rocker;
        int err;

        err = rocker_dma_ring_create(rocker,
                                     ROCKER_DMA_TX(rocker_port->port_number),
                                     ROCKER_DMA_TX_DEFAULT_SIZE,
                                     &rocker_port->tx_ring);
        if (err) {
                netdev_err(rocker_port->dev, "failed to create tx dma ring\n");
                return err;
        }

        err = rocker_dma_ring_bufs_alloc(rocker, &rocker_port->tx_ring,
                                         DMA_TO_DEVICE,
                                         ROCKER_DMA_TX_DESC_SIZE);
        if (err) {
                netdev_err(rocker_port->dev, "failed to alloc tx dma ring buffers\n");
                goto err_dma_tx_ring_bufs_alloc;
        }

        err = rocker_dma_ring_create(rocker,
                                     ROCKER_DMA_RX(rocker_port->port_number),
                                     ROCKER_DMA_RX_DEFAULT_SIZE,
                                     &rocker_port->rx_ring);
        if (err) {
                netdev_err(rocker_port->dev, "failed to create rx dma ring\n");
                goto err_dma_rx_ring_create;
        }

        err = rocker_dma_ring_bufs_alloc(rocker, &rocker_port->rx_ring,
                                         DMA_BIDIRECTIONAL,
                                         ROCKER_DMA_RX_DESC_SIZE);
        if (err) {
                netdev_err(rocker_port->dev, "failed to alloc rx dma ring buffers\n");
                goto err_dma_rx_ring_bufs_alloc;
        }

        err = rocker_dma_rx_ring_skbs_alloc(rocker_port);
        if (err) {
                netdev_err(rocker_port->dev, "failed to alloc rx dma ring skbs\n");
                goto err_dma_rx_ring_skbs_alloc;
        }
        rocker_dma_ring_pass_to_producer(rocker, &rocker_port->rx_ring);

        return 0;

err_dma_rx_ring_skbs_alloc:
        rocker_dma_ring_bufs_free(rocker, &rocker_port->rx_ring,
                                  DMA_BIDIRECTIONAL);
err_dma_rx_ring_bufs_alloc:
        rocker_dma_ring_destroy(rocker, &rocker_port->rx_ring);
err_dma_rx_ring_create:
        rocker_dma_ring_bufs_free(rocker, &rocker_port->tx_ring,
                                  DMA_TO_DEVICE);
err_dma_tx_ring_bufs_alloc:
        rocker_dma_ring_destroy(rocker, &rocker_port->tx_ring);
        return err;
}

static void rocker_port_dma_rings_fini(struct rocker_port *rocker_port)
{
        struct rocker *rocker = rocker_port->rocker;

        rocker_dma_rx_ring_skbs_free(rocker_port);
        rocker_dma_ring_bufs_free(rocker, &rocker_port->rx_ring,
                                  DMA_BIDIRECTIONAL);
        rocker_dma_ring_destroy(rocker, &rocker_port->rx_ring);
        rocker_dma_ring_bufs_free(rocker, &rocker_port->tx_ring,
                                  DMA_TO_DEVICE);
        rocker_dma_ring_destroy(rocker, &rocker_port->tx_ring);
}

static void rocker_port_set_enable(const struct rocker_port *rocker_port,
                                   bool enable)
{
        u64 val = rocker_read64(rocker_port->rocker, PORT_PHYS_ENABLE);

        if (enable)
                val |= 1ULL << rocker_port->pport;
        else
                val &= ~(1ULL << rocker_port->pport);
        rocker_write64(rocker_port->rocker, PORT_PHYS_ENABLE, val);
}

/********************************
 * Interrupt handler and helpers
 ********************************/

static irqreturn_t rocker_cmd_irq_handler(int irq, void *dev_id)
{
        struct rocker *rocker = dev_id;
        const struct rocker_desc_info *desc_info;
        struct rocker_wait *wait;
        u32 credits = 0;

        spin_lock(&rocker->cmd_ring_lock);
        while ((desc_info = rocker_desc_tail_get(&rocker->cmd_ring))) {
                wait = rocker_desc_cookie_ptr_get(desc_info);
                if (wait->nowait) {
                        rocker_desc_gen_clear(desc_info);
                } else {
                        rocker_wait_wake_up(wait);
                }
                credits++;
        }
        spin_unlock(&rocker->cmd_ring_lock);
        rocker_dma_ring_credits_set(rocker, &rocker->cmd_ring, credits);

        return IRQ_HANDLED;
}

static void rocker_port_link_up(const struct rocker_port *rocker_port)
{
        netif_carrier_on(rocker_port->dev);
        netdev_info(rocker_port->dev, "Link is up\n");
}

static void rocker_port_link_down(const struct rocker_port *rocker_port)
{
        netif_carrier_off(rocker_port->dev);
        netdev_info(rocker_port->dev, "Link is down\n");
}

static int rocker_event_link_change(const struct rocker *rocker,
                                    const struct rocker_tlv *info)
{
        const struct rocker_tlv *attrs[ROCKER_TLV_EVENT_LINK_CHANGED_MAX + 1];
        unsigned int port_number;
        bool link_up;
        struct rocker_port *rocker_port;

        rocker_tlv_parse_nested(attrs, ROCKER_TLV_EVENT_LINK_CHANGED_MAX, info);
        if (!attrs[ROCKER_TLV_EVENT_LINK_CHANGED_PPORT] ||
            !attrs[ROCKER_TLV_EVENT_LINK_CHANGED_LINKUP])
                return -EIO;
        port_number =
                rocker_tlv_get_u32(attrs[ROCKER_TLV_EVENT_LINK_CHANGED_PPORT]) - 1;
        link_up = rocker_tlv_get_u8(attrs[ROCKER_TLV_EVENT_LINK_CHANGED_LINKUP]);

        if (port_number >= rocker->port_count)
                return -EINVAL;

        rocker_port = rocker->ports[port_number];
        if (netif_carrier_ok(rocker_port->dev) != link_up) {
                if (link_up)
                        rocker_port_link_up(rocker_port);
                else
                        rocker_port_link_down(rocker_port);
        }

        return 0;
}

static int rocker_world_port_ev_mac_vlan_seen(struct rocker_port *rocker_port,
                                              const unsigned char *addr,
                                              __be16 vlan_id);

static int rocker_event_mac_vlan_seen(const struct rocker *rocker,
                                      const struct rocker_tlv *info)
{
        const struct rocker_tlv *attrs[ROCKER_TLV_EVENT_MAC_VLAN_MAX + 1];
        unsigned int port_number;
        struct rocker_port *rocker_port;
        const unsigned char *addr;
        __be16 vlan_id;

        rocker_tlv_parse_nested(attrs, ROCKER_TLV_EVENT_MAC_VLAN_MAX, info);
        if (!attrs[ROCKER_TLV_EVENT_MAC_VLAN_PPORT] ||
            !attrs[ROCKER_TLV_EVENT_MAC_VLAN_MAC] ||
            !attrs[ROCKER_TLV_EVENT_MAC_VLAN_VLAN_ID])
                return -EIO;
        port_number =
                rocker_tlv_get_u32(attrs[ROCKER_TLV_EVENT_MAC_VLAN_PPORT]) - 1;
        addr = rocker_tlv_data(attrs[ROCKER_TLV_EVENT_MAC_VLAN_MAC]);
        vlan_id = rocker_tlv_get_be16(attrs[ROCKER_TLV_EVENT_MAC_VLAN_VLAN_ID]);

        if (port_number >= rocker->port_count)
                return -EINVAL;

        rocker_port = rocker->ports[port_number];
        return rocker_world_port_ev_mac_vlan_seen(rocker_port, addr, vlan_id);
}

static int rocker_event_process(const struct rocker *rocker,
                                const struct rocker_desc_info *desc_info)
{
        const struct rocker_tlv *attrs[ROCKER_TLV_EVENT_MAX + 1];
        const struct rocker_tlv *info;
        u16 type;

        rocker_tlv_parse_desc(attrs, ROCKER_TLV_EVENT_MAX, desc_info);
        if (!attrs[ROCKER_TLV_EVENT_TYPE] ||
            !attrs[ROCKER_TLV_EVENT_INFO])
                return -EIO;

        type = rocker_tlv_get_u16(attrs[ROCKER_TLV_EVENT_TYPE]);
        info = attrs[ROCKER_TLV_EVENT_INFO];

        switch (type) {
        case ROCKER_TLV_EVENT_TYPE_LINK_CHANGED:
                return rocker_event_link_change(rocker, info);
        case ROCKER_TLV_EVENT_TYPE_MAC_VLAN_SEEN:
                return rocker_event_mac_vlan_seen(rocker, info);
        }

        return -EOPNOTSUPP;
}

static irqreturn_t rocker_event_irq_handler(int irq, void *dev_id)
{
        struct rocker *rocker = dev_id;
        const struct pci_dev *pdev = rocker->pdev;

        const struct rocker_desc_info *desc_info;
        u32 credits = 0;
        int err;

        while ((desc_info = rocker_desc_tail_get(&rocker->event_ring))) {
                err = rocker_desc_err(desc_info);
                if (err) {
                        dev_err(&pdev->dev, "event desc received with err %d\n",
                                err);
                } else {
                        err = rocker_event_process(rocker, desc_info);
                        if (err)
                                dev_err(&pdev->dev, "event processing failed with err %d\n",
                                        err);
                }
                rocker_desc_gen_clear(desc_info);
                rocker_desc_head_set(rocker, &rocker->event_ring, desc_info);
                credits++;
        }
        rocker_dma_ring_credits_set(rocker, &rocker->event_ring, credits);

        return IRQ_HANDLED;
}

static irqreturn_t rocker_tx_irq_handler(int irq, void *dev_id)
{
        struct rocker_port *rocker_port = dev_id;

        napi_schedule(&rocker_port->napi_tx);
        return IRQ_HANDLED;
}

static irqreturn_t rocker_rx_irq_handler(int irq, void *dev_id)
{
        struct rocker_port *rocker_port = dev_id;

        napi_schedule(&rocker_port->napi_rx);
        return IRQ_HANDLED;
}

/********************
 * Command interface
 ********************/

int rocker_cmd_exec(struct rocker_port *rocker_port, bool nowait,
                    rocker_cmd_prep_cb_t prepare, void *prepare_priv,
                    rocker_cmd_proc_cb_t process, void *process_priv)
{
        struct rocker *rocker = rocker_port->rocker;
        struct rocker_desc_info *desc_info;
        struct rocker_wait *wait;
        unsigned long lock_flags;
        int err;

        spin_lock_irqsave(&rocker->cmd_ring_lock, lock_flags);

        desc_info = rocker_desc_head_get(&rocker->cmd_ring);
        if (!desc_info) {
                spin_unlock_irqrestore(&rocker->cmd_ring_lock, lock_flags);
                return -EAGAIN;
        }

        wait = rocker_desc_cookie_ptr_get(desc_info);
        rocker_wait_init(wait);
        wait->nowait = nowait;

        err = prepare(rocker_port, desc_info, prepare_priv);
        if (err) {
                spin_unlock_irqrestore(&rocker->cmd_ring_lock, lock_flags);
                return err;
        }

        rocker_desc_head_set(rocker, &rocker->cmd_ring, desc_info);

        spin_unlock_irqrestore(&rocker->cmd_ring_lock, lock_flags);

        if (nowait)
                return 0;

        if (!rocker_wait_event_timeout(wait, HZ / 10))
                return -EIO;

        err = rocker_desc_err(desc_info);
        if (err)
                return err;

        if (process)
                err = process(rocker_port, desc_info, process_priv);

        rocker_desc_gen_clear(desc_info);
        return err;
}

static int
rocker_cmd_get_port_settings_prep(const struct rocker_port *rocker_port,
                                  struct rocker_desc_info *desc_info,
                                  void *priv)
{
        struct rocker_tlv *cmd_info;

        if (rocker_tlv_put_u16(desc_info, ROCKER_TLV_CMD_TYPE,
                               ROCKER_TLV_CMD_TYPE_GET_PORT_SETTINGS))
                return -EMSGSIZE;
        cmd_info = rocker_tlv_nest_start(desc_info, ROCKER_TLV_CMD_INFO);
        if (!cmd_info)
                return -EMSGSIZE;
        if (rocker_tlv_put_u32(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_PPORT,
                               rocker_port->pport))
                return -EMSGSIZE;
        rocker_tlv_nest_end(desc_info, cmd_info);
        return 0;
}

static int
rocker_cmd_get_port_settings_ethtool_proc(const struct rocker_port *rocker_port,
                                          const struct rocker_desc_info *desc_info,
                                          void *priv)
{
        struct ethtool_link_ksettings *ecmd = priv;
        const struct rocker_tlv *attrs[ROCKER_TLV_CMD_MAX + 1];
        const struct rocker_tlv *info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_MAX + 1];
        u32 speed;
        u8 duplex;
        u8 autoneg;

        rocker_tlv_parse_desc(attrs, ROCKER_TLV_CMD_MAX, desc_info);
        if (!attrs[ROCKER_TLV_CMD_INFO])
                return -EIO;

        rocker_tlv_parse_nested(info_attrs, ROCKER_TLV_CMD_PORT_SETTINGS_MAX,
                                attrs[ROCKER_TLV_CMD_INFO]);
        if (!info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_SPEED] ||
            !info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_DUPLEX] ||
            !info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_AUTONEG])
                return -EIO;

        speed = rocker_tlv_get_u32(info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_SPEED]);
        duplex = rocker_tlv_get_u8(info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_DUPLEX]);
        autoneg = rocker_tlv_get_u8(info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_AUTONEG]);

        ethtool_link_ksettings_zero_link_mode(ecmd, supported);
        ethtool_link_ksettings_add_link_mode(ecmd, supported, TP);

        ecmd->base.phy_address = 0xff;
        ecmd->base.port = PORT_TP;
        ecmd->base.speed = speed;
        ecmd->base.duplex = duplex ? DUPLEX_FULL : DUPLEX_HALF;
        ecmd->base.autoneg = autoneg ? AUTONEG_ENABLE : AUTONEG_DISABLE;

        return 0;
}

static int
rocker_cmd_get_port_settings_macaddr_proc(const struct rocker_port *rocker_port,
                                          const struct rocker_desc_info *desc_info,
                                          void *priv)
{
        unsigned char *macaddr = priv;
        const struct rocker_tlv *attrs[ROCKER_TLV_CMD_MAX + 1];
        const struct rocker_tlv *info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_MAX + 1];
        const struct rocker_tlv *attr;

        rocker_tlv_parse_desc(attrs, ROCKER_TLV_CMD_MAX, desc_info);
        if (!attrs[ROCKER_TLV_CMD_INFO])
                return -EIO;

        rocker_tlv_parse_nested(info_attrs, ROCKER_TLV_CMD_PORT_SETTINGS_MAX,
                                attrs[ROCKER_TLV_CMD_INFO]);
        attr = info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_MACADDR];
        if (!attr)
                return -EIO;

        if (rocker_tlv_len(attr) != ETH_ALEN)
                return -EINVAL;

        ether_addr_copy(macaddr, rocker_tlv_data(attr));
        return 0;
}

static int
rocker_cmd_get_port_settings_mode_proc(const struct rocker_port *rocker_port,
                                       const struct rocker_desc_info *desc_info,
                                       void *priv)
{
        u8 *p_mode = priv;
        const struct rocker_tlv *attrs[ROCKER_TLV_CMD_MAX + 1];
        const struct rocker_tlv *info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_MAX + 1];
        const struct rocker_tlv *attr;

        rocker_tlv_parse_desc(attrs, ROCKER_TLV_CMD_MAX, desc_info);
        if (!attrs[ROCKER_TLV_CMD_INFO])
                return -EIO;

        rocker_tlv_parse_nested(info_attrs, ROCKER_TLV_CMD_PORT_SETTINGS_MAX,
                                attrs[ROCKER_TLV_CMD_INFO]);
        attr = info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_MODE];
        if (!attr)
                return -EIO;

        *p_mode = rocker_tlv_get_u8(info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_MODE]);
        return 0;
}

struct port_name {
        char *buf;
        size_t len;
};

static int
rocker_cmd_get_port_settings_phys_name_proc(const struct rocker_port *rocker_port,
                                            const struct rocker_desc_info *desc_info,
                                            void *priv)
{
        const struct rocker_tlv *info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_MAX + 1];
        const struct rocker_tlv *attrs[ROCKER_TLV_CMD_MAX + 1];
        struct port_name *name = priv;
        const struct rocker_tlv *attr;
        size_t i, j, len;
        const char *str;

        rocker_tlv_parse_desc(attrs, ROCKER_TLV_CMD_MAX, desc_info);
        if (!attrs[ROCKER_TLV_CMD_INFO])
                return -EIO;

        rocker_tlv_parse_nested(info_attrs, ROCKER_TLV_CMD_PORT_SETTINGS_MAX,
                                attrs[ROCKER_TLV_CMD_INFO]);
        attr = info_attrs[ROCKER_TLV_CMD_PORT_SETTINGS_PHYS_NAME];
        if (!attr)
                return -EIO;

        len = min_t(size_t, rocker_tlv_len(attr), name->len);
        str = rocker_tlv_data(attr);

        /* make sure name only contains alphanumeric characters */
        for (i = j = 0; i < len; ++i) {
                if (isalnum(str[i])) {
                        name->buf[j] = str[i];
                        j++;
                }
        }

        if (j == 0)
                return -EIO;

        name->buf[j] = '\0';

        return 0;
}

static int
rocker_cmd_set_port_settings_ethtool_prep(const struct rocker_port *rocker_port,
                                          struct rocker_desc_info *desc_info,
                                          void *priv)
{
        struct ethtool_link_ksettings *ecmd = priv;
        struct rocker_tlv *cmd_info;

        if (rocker_tlv_put_u16(desc_info, ROCKER_TLV_CMD_TYPE,
                               ROCKER_TLV_CMD_TYPE_SET_PORT_SETTINGS))
                return -EMSGSIZE;
        cmd_info = rocker_tlv_nest_start(desc_info, ROCKER_TLV_CMD_INFO);
        if (!cmd_info)
                return -EMSGSIZE;
        if (rocker_tlv_put_u32(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_PPORT,
                               rocker_port->pport))
                return -EMSGSIZE;
        if (rocker_tlv_put_u32(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_SPEED,
                               ecmd->base.speed))
                return -EMSGSIZE;
        if (rocker_tlv_put_u8(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_DUPLEX,
                              ecmd->base.duplex))
                return -EMSGSIZE;
        if (rocker_tlv_put_u8(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_AUTONEG,
                              ecmd->base.autoneg))
                return -EMSGSIZE;
        rocker_tlv_nest_end(desc_info, cmd_info);
        return 0;
}

static int
rocker_cmd_set_port_settings_macaddr_prep(const struct rocker_port *rocker_port,
                                          struct rocker_desc_info *desc_info,
                                          void *priv)
{
        const unsigned char *macaddr = priv;
        struct rocker_tlv *cmd_info;

        if (rocker_tlv_put_u16(desc_info, ROCKER_TLV_CMD_TYPE,
                               ROCKER_TLV_CMD_TYPE_SET_PORT_SETTINGS))
                return -EMSGSIZE;
        cmd_info = rocker_tlv_nest_start(desc_info, ROCKER_TLV_CMD_INFO);
        if (!cmd_info)
                return -EMSGSIZE;
        if (rocker_tlv_put_u32(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_PPORT,
                               rocker_port->pport))
                return -EMSGSIZE;
        if (rocker_tlv_put(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_MACADDR,
                           ETH_ALEN, macaddr))
                return -EMSGSIZE;
        rocker_tlv_nest_end(desc_info, cmd_info);
        return 0;
}

static int
rocker_cmd_set_port_settings_mtu_prep(const struct rocker_port *rocker_port,
                                      struct rocker_desc_info *desc_info,
                                      void *priv)
{
        int mtu = *(int *)priv;
        struct rocker_tlv *cmd_info;

        if (rocker_tlv_put_u16(desc_info, ROCKER_TLV_CMD_TYPE,
                               ROCKER_TLV_CMD_TYPE_SET_PORT_SETTINGS))
                return -EMSGSIZE;
        cmd_info = rocker_tlv_nest_start(desc_info, ROCKER_TLV_CMD_INFO);
        if (!cmd_info)
                return -EMSGSIZE;
        if (rocker_tlv_put_u32(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_PPORT,
                               rocker_port->pport))
                return -EMSGSIZE;
        if (rocker_tlv_put_u16(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_MTU,
                               mtu))
                return -EMSGSIZE;
        rocker_tlv_nest_end(desc_info, cmd_info);
        return 0;
}

static int
rocker_cmd_set_port_learning_prep(const struct rocker_port *rocker_port,
                                  struct rocker_desc_info *desc_info,
                                  void *priv)
{
        bool learning = *(bool *)priv;
        struct rocker_tlv *cmd_info;

        if (rocker_tlv_put_u16(desc_info, ROCKER_TLV_CMD_TYPE,
                               ROCKER_TLV_CMD_TYPE_SET_PORT_SETTINGS))
                return -EMSGSIZE;
        cmd_info = rocker_tlv_nest_start(desc_info, ROCKER_TLV_CMD_INFO);
        if (!cmd_info)
                return -EMSGSIZE;
        if (rocker_tlv_put_u32(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_PPORT,
                               rocker_port->pport))
                return -EMSGSIZE;
        if (rocker_tlv_put_u8(desc_info, ROCKER_TLV_CMD_PORT_SETTINGS_LEARNING,
                              learning))
                return -EMSGSIZE;
        rocker_tlv_nest_end(desc_info, cmd_info);
        return 0;
}

static int
rocker_cmd_get_port_settings_ethtool(struct rocker_port *rocker_port,
                                     struct ethtool_link_ksettings *ecmd)
{
        return rocker_cmd_exec(rocker_port, false,
                               rocker_cmd_get_port_settings_prep, NULL,
                               rocker_cmd_get_port_settings_ethtool_proc,
                               ecmd);
}

static int rocker_cmd_get_port_settings_macaddr(struct rocker_port *rocker_port,
                                                unsigned char *macaddr)
{
        return rocker_cmd_exec(rocker_port, false,
                               rocker_cmd_get_port_settings_prep, NULL,
                               rocker_cmd_get_port_settings_macaddr_proc,
                               macaddr);
}

static int rocker_cmd_get_port_settings_mode(struct rocker_port *rocker_port,
                                             u8 *p_mode)
{
        return rocker_cmd_exec(rocker_port, false,
                               rocker_cmd_get_port_settings_prep, NULL,
                               rocker_cmd_get_port_settings_mode_proc, p_mode);
}

static int
rocker_cmd_set_port_settings_ethtool(struct rocker_port *rocker_port,
                                     const struct ethtool_link_ksettings *ecmd)
{
        struct ethtool_link_ksettings copy_ecmd;

        memcpy(&copy_ecmd, ecmd, sizeof(copy_ecmd));

        return rocker_cmd_exec(rocker_port, false,
                               rocker_cmd_set_port_settings_ethtool_prep,
                               &copy_ecmd, NULL, NULL);
}

static int rocker_cmd_set_port_settings_macaddr(struct rocker_port *rocker_port,
                                                unsigned char *macaddr)
{
        return rocker_cmd_exec(rocker_port, false,
                               rocker_cmd_set_port_settings_macaddr_prep,
                               macaddr, NULL, NULL);
}

static int rocker_cmd_set_port_settings_mtu(struct rocker_port *rocker_port,
                                            int mtu)
{
        return rocker_cmd_exec(rocker_port, false,
                               rocker_cmd_set_port_settings_mtu_prep,
                               &mtu, NULL, NULL);
}

int rocker_port_set_learning(struct rocker_port *rocker_port,
                             bool learning)
{
        return rocker_cmd_exec(rocker_port, false,
                               rocker_cmd_set_port_learning_prep,
                               &learning, NULL, NULL);
}

/**********************
 * Worlds manipulation
 **********************/

static struct rocker_world_ops *rocker_world_ops[] = {
        &rocker_ofdpa_ops,
};

#define ROCKER_WORLD_OPS_LEN ARRAY_SIZE(rocker_world_ops)

static struct rocker_world_ops *rocker_world_ops_find(u8 mode)
{
        int i;

        for (i = 0; i < ROCKER_WORLD_OPS_LEN; i++)
                if (rocker_world_ops[i]->mode == mode)
                        return rocker_world_ops[i];
        return NULL;
}

static int rocker_world_init(struct rocker *rocker, u8 mode)
{
        struct rocker_world_ops *wops;
        int err;

        wops = rocker_world_ops_find(mode);
        if (!wops) {
                dev_err(&rocker->pdev->dev, "port mode \"%d\" is not supported\n",
                        mode);
                return -EINVAL;
        }
        rocker->wops = wops;
        rocker->wpriv = kzalloc(wops->priv_size, GFP_KERNEL);
        if (!rocker->wpriv)
                return -ENOMEM;
        if (!wops->init)
                return 0;
        err = wops->init(rocker);
        if (err)
                kfree(rocker->wpriv);
        return err;
}

static void rocker_world_fini(struct rocker *rocker)
{
        struct rocker_world_ops *wops = rocker->wops;

        if (!wops || !wops->fini)
                return;
        wops->fini(rocker);
        kfree(rocker->wpriv);
}

static int rocker_world_check_init(struct rocker_port *rocker_port)
{
        struct rocker *rocker = rocker_port->rocker;
        u8 mode;
        int err;

        err = rocker_cmd_get_port_settings_mode(rocker_port, &mode);
        if (err) {
                dev_err(&rocker->pdev->dev, "failed to get port mode\n");
                return err;
        }
        if (rocker->wops) {
                if (rocker->wops->mode != mode) {
                        dev_err(&rocker->pdev->dev, "hardware has ports in different worlds, which is not supported\n");
                        return -EINVAL;
                }
                return 0;
        }
        return rocker_world_init(rocker, mode);
}

static int rocker_world_port_pre_init(struct rocker_port *rocker_port)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;
        int err;

        rocker_port->wpriv = kzalloc(wops->port_priv_size, GFP_KERNEL);
        if (!rocker_port->wpriv)
                return -ENOMEM;
        if (!wops->port_pre_init)
                return 0;
        err = wops->port_pre_init(rocker_port);
        if (err)
                kfree(rocker_port->wpriv);
        return 0;
}

static int rocker_world_port_init(struct rocker_port *rocker_port)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_init)
                return 0;
        return wops->port_init(rocker_port);
}

static void rocker_world_port_fini(struct rocker_port *rocker_port)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_fini)
                return;
        wops->port_fini(rocker_port);
}

static void rocker_world_port_post_fini(struct rocker_port *rocker_port)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_post_fini)
                return;
        wops->port_post_fini(rocker_port);
        kfree(rocker_port->wpriv);
}

static int rocker_world_port_open(struct rocker_port *rocker_port)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_open)
                return 0;
        return wops->port_open(rocker_port);
}

static void rocker_world_port_stop(struct rocker_port *rocker_port)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_stop)
                return;
        wops->port_stop(rocker_port);
}

static int rocker_world_port_attr_stp_state_set(struct rocker_port *rocker_port,
                                                u8 state)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_attr_stp_state_set)
                return -EOPNOTSUPP;

        return wops->port_attr_stp_state_set(rocker_port, state);
}

static int
rocker_world_port_attr_bridge_flags_support_get(const struct rocker_port *
                                                rocker_port,
                                                unsigned long *
                                                p_brport_flags_support)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_attr_bridge_flags_support_get)
                return -EOPNOTSUPP;
        return wops->port_attr_bridge_flags_support_get(rocker_port,
                                                        p_brport_flags_support);
}

static int
rocker_world_port_attr_pre_bridge_flags_set(struct rocker_port *rocker_port,
                                            struct switchdev_brport_flags flags)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;
        unsigned long brport_flags_s;
        int err;

        if (!wops->port_attr_bridge_flags_set)
                return -EOPNOTSUPP;

        err = rocker_world_port_attr_bridge_flags_support_get(rocker_port,
                                                              &brport_flags_s);
        if (err)
                return err;

        if (flags.mask & ~brport_flags_s)
                return -EINVAL;

        return 0;
}

static int
rocker_world_port_attr_bridge_flags_set(struct rocker_port *rocker_port,
                                        struct switchdev_brport_flags flags)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_attr_bridge_flags_set)
                return -EOPNOTSUPP;

        return wops->port_attr_bridge_flags_set(rocker_port, flags.val);
}

static int
rocker_world_port_attr_bridge_ageing_time_set(struct rocker_port *rocker_port,
                                              u32 ageing_time)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_attr_bridge_ageing_time_set)
                return -EOPNOTSUPP;

        return wops->port_attr_bridge_ageing_time_set(rocker_port, ageing_time);
}

static int
rocker_world_port_obj_vlan_add(struct rocker_port *rocker_port,
                               const struct switchdev_obj_port_vlan *vlan)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_obj_vlan_add)
                return -EOPNOTSUPP;

        return wops->port_obj_vlan_add(rocker_port, vlan);
}

static int
rocker_world_port_obj_vlan_del(struct rocker_port *rocker_port,
                               const struct switchdev_obj_port_vlan *vlan)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (netif_is_bridge_master(vlan->obj.orig_dev))
                return -EOPNOTSUPP;

        if (!wops->port_obj_vlan_del)
                return -EOPNOTSUPP;
        return wops->port_obj_vlan_del(rocker_port, vlan);
}

static int
rocker_world_port_fdb_add(struct rocker_port *rocker_port,
                          struct switchdev_notifier_fdb_info *info)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_obj_fdb_add)
                return -EOPNOTSUPP;

        return wops->port_obj_fdb_add(rocker_port, info->vid, info->addr);
}

static int
rocker_world_port_fdb_del(struct rocker_port *rocker_port,
                          struct switchdev_notifier_fdb_info *info)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_obj_fdb_del)
                return -EOPNOTSUPP;
        return wops->port_obj_fdb_del(rocker_port, info->vid, info->addr);
}

static int rocker_world_port_master_linked(struct rocker_port *rocker_port,
                                           struct net_device *master)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_master_linked)
                return -EOPNOTSUPP;
        return wops->port_master_linked(rocker_port, master);
}

static int rocker_world_port_master_unlinked(struct rocker_port *rocker_port,
                                             struct net_device *master)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_master_unlinked)
                return -EOPNOTSUPP;
        return wops->port_master_unlinked(rocker_port, master);
}

static int rocker_world_port_neigh_update(struct rocker_port *rocker_port,
                                          struct neighbour *n)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_neigh_update)
                return -EOPNOTSUPP;
        return wops->port_neigh_update(rocker_port, n);
}

static int rocker_world_port_neigh_destroy(struct rocker_port *rocker_port,
                                           struct neighbour *n)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_neigh_destroy)
                return -EOPNOTSUPP;
        return wops->port_neigh_destroy(rocker_port, n);
}

static int rocker_world_port_ev_mac_vlan_seen(struct rocker_port *rocker_port,
                                              const unsigned char *addr,
                                              __be16 vlan_id)
{
        struct rocker_world_ops *wops = rocker_port->rocker->wops;

        if (!wops->port_ev_mac_vlan_seen)
                return -EOPNOTSUPP;
        return wops->port_ev_mac_vlan_seen(rocker_port, addr, vlan_id);
}

static int rocker_world_fib4_add(struct rocker *rocker,
                                 const struct fib_entry_notifier_info *fen_info)
{
        struct rocker_world_ops *wops = rocker->wops;

        if (!wops->fib4_add)
                return 0;
        return wops->fib4_add(rocker, fen_info);
}

static int rocker_world_fib4_del(struct rocker *rocker,
                                 const struct fib_entry_notifier_info *fen_info)
{
        struct rocker_world_ops *wops = rocker->wops;

        if (!wops->fib4_del)
                return 0;
        return wops->fib4_del(rocker, fen_info);
}

static void rocker_world_fib4_abort(struct rocker *rocker)
{
        struct rocker_world_ops *wops = rocker->wops;

        if (wops->fib4_abort)
                wops->fib4_abort(rocker);
}

/*****************
 * Net device ops
 *****************/

static int rocker_port_open(struct net_device *dev)
{
        struct rocker_port *rocker_port = netdev_priv(dev);
        int err;

        err = rocker_port_dma_rings_init(rocker_port);
        if (err)
                return err;

        err = request_irq(rocker_msix_tx_vector(rocker_port),
                          rocker_tx_irq_handler, 0,
                          rocker_driver_name, rocker_port);
        if (err) {
                netdev_err(rocker_port->dev, "cannot assign tx irq\n");
                goto err_request_tx_irq;
        }

        err = request_irq(rocker_msix_rx_vector(rocker_port),
                          rocker_rx_irq_handler, 0,
                          rocker_driver_name, rocker_port);
        if (err) {
                netdev_err(rocker_port->dev, "cannot assign rx irq\n");
                goto err_request_rx_irq;
        }

        err = rocker_world_port_open(rocker_port);
        if (err) {
                netdev_err(rocker_port->dev, "cannot open port in world\n");
                goto err_world_port_open;
        }

        napi_enable(&rocker_port->napi_tx);
        napi_enable(&rocker_port->napi_rx);
        if (!dev->proto_down)
                rocker_port_set_enable(rocker_port, true);
        netif_start_queue(dev);
        return 0;

err_world_port_open:
        free_irq(rocker_msix_rx_vector(rocker_port), rocker_port);
err_request_rx_irq:
        free_irq(rocker_msix_tx_vector(rocker_port), rocker_port);
err_request_tx_irq:
        rocker_port_dma_rings_fini(rocker_port);
        return err;
}

static int rocker_port_stop(struct net_device *dev)
{
        struct rocker_port *rocker_port = netdev_priv(dev);

        netif_stop_queue(dev);
        rocker_port_set_enable(rocker_port, false);
        napi_disable(&rocker_port->napi_rx);
        napi_disable(&rocker_port->napi_tx);
        rocker_world_port_stop(rocker_port);
        free_irq(rocker_msix_rx_vector(rocker_port), rocker_port);
        free_irq(rocker_msix_tx_vector(rocker_port), rocker_port);
        rocker_port_dma_rings_fini(rocker_port);

        return 0;
}

static void rocker_tx_desc_frags_unmap(const struct rocker_port *rocker_port,
                                       const struct rocker_desc_info *desc_info)
{
        const struct rocker *rocker = rocker_port->rocker;
        struct pci_dev *pdev = rocker->pdev;
        const struct rocker_tlv *attrs[ROCKER_TLV_TX_MAX + 1];
        struct rocker_tlv *attr;
        int rem;

        rocker_tlv_parse_desc(attrs, ROCKER_TLV_TX_MAX, desc_info);
        if (!attrs[ROCKER_TLV_TX_FRAGS])
                return;
        rocker_tlv_for_each_nested(attr, attrs[ROCKER_TLV_TX_FRAGS], rem) {
                const struct rocker_tlv *frag_attrs[ROCKER_TLV_TX_FRAG_ATTR_MAX + 1];
                dma_addr_t dma_handle;
                size_t len;

                if (rocker_tlv_type(attr) != ROCKER_TLV_TX_FRAG)
                        continue;
                rocker_tlv_parse_nested(frag_attrs, ROCKER_TLV_TX_FRAG_ATTR_MAX,
                                        attr);
                if (!frag_attrs[ROCKER_TLV_TX_FRAG_ATTR_ADDR] ||
                    !frag_attrs[ROCKER_TLV_TX_FRAG_ATTR_LEN])
                        continue;
                dma_handle = rocker_tlv_get_u64(frag_attrs[ROCKER_TLV_TX_FRAG_ATTR_ADDR]);
                len = rocker_tlv_get_u16(frag_attrs[ROCKER_TLV_TX_FRAG_ATTR_LEN]);
                dma_unmap_single(&pdev->dev, dma_handle, len, DMA_TO_DEVICE);
        }
}

static int rocker_tx_desc_frag_map_put(const struct rocker_port *rocker_port,
                                       struct rocker_desc_info *desc_info,
                                       char *buf, size_t buf_len)
{
        const struct rocker *rocker = rocker_port->rocker;
        struct pci_dev *pdev = rocker->pdev;
        dma_addr_t dma_handle;
        struct rocker_tlv *frag;

        dma_handle = dma_map_single(&pdev->dev, buf, buf_len, DMA_TO_DEVICE);
        if (unlikely(dma_mapping_error(&pdev->dev, dma_handle))) {
                if (net_ratelimit())
                        netdev_err(rocker_port->dev, "failed to dma map tx frag\n");
                return -EIO;
        }
        frag = rocker_tlv_nest_start(desc_info, ROCKER_TLV_TX_FRAG);
        if (!frag)
                goto unmap_frag;
        if (rocker_tlv_put_u64(desc_info, ROCKER_TLV_TX_FRAG_ATTR_ADDR,
                               dma_handle))
                goto nest_cancel;
        if (rocker_tlv_put_u16(desc_info, ROCKER_TLV_TX_FRAG_ATTR_LEN,
                               buf_len))
                goto nest_cancel;
        rocker_tlv_nest_end(desc_info, frag);
        return 0;

nest_cancel:
        rocker_tlv_nest_cancel(desc_info, frag);
unmap_frag:
        dma_unmap_single(&pdev->dev, dma_handle, buf_len, DMA_TO_DEVICE);
        return -EMSGSIZE;
}

static netdev_tx_t rocker_port_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct rocker_port *rocker_port = netdev_priv(dev);
        struct rocker *rocker = rocker_port->rocker;
        struct rocker_desc_info *desc_info;
        struct rocker_tlv *frags;
        int i;
        int err;

        desc_info = rocker_desc_head_get(&rocker_port->tx_ring);
        if (unlikely(!desc_info)) {
                if (net_ratelimit())
                        netdev_err(dev, "tx ring full when queue awake\n");
                return NETDEV_TX_BUSY;
        }

        rocker_desc_cookie_ptr_set(desc_info, skb);

        frags = rocker_tlv_nest_start(desc_info, ROCKER_TLV_TX_FRAGS);
        if (!frags)
                goto out;
        err = rocker_tx_desc_frag_map_put(rocker_port, desc_info,
                                          skb->data, skb_headlen(skb));
        if (err)
                goto nest_cancel;
        if (skb_shinfo(skb)->nr_frags > ROCKER_TX_FRAGS_MAX) {
                err = skb_linearize(skb);
                if (err)
                        goto unmap_frags;
        }

        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

                err = rocker_tx_desc_frag_map_put(rocker_port, desc_info,
                                                  skb_frag_address(frag),
                                                  skb_frag_size(frag));
                if (err)
                        goto unmap_frags;
        }
        rocker_tlv_nest_end(desc_info, frags);

        rocker_desc_gen_clear(desc_info);
        rocker_desc_head_set(rocker, &rocker_port->tx_ring, desc_info);

        desc_info = rocker_desc_head_get(&rocker_port->tx_ring);
        if (!desc_info)
                netif_stop_queue(dev);

        return NETDEV_TX_OK;

unmap_frags:
        rocker_tx_desc_frags_unmap(rocker_port, desc_info);
nest_cancel:
        rocker_tlv_nest_cancel(desc_info, frags);
out:
        dev_kfree_skb(skb);
        dev->stats.tx_dropped++;

        return NETDEV_TX_OK;
}

static int rocker_port_set_mac_address(struct net_device *dev, void *p)
{
        struct sockaddr *addr = p;
        struct rocker_port *rocker_port = netdev_priv(dev);
        int err;

        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        err = rocker_cmd_set_port_settings_macaddr(rocker_port, addr->sa_data);
        if (err)
                return err;
        memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
        return 0;
}

static int rocker_port_change_mtu(struct net_device *dev, int new_mtu)
{
        struct rocker_port *rocker_port = netdev_priv(dev);
        int running = netif_running(dev);
        int err;

        if (running)
                rocker_port_stop(dev);

        netdev_info(dev, "MTU change from %d to %d\n", dev->mtu, new_mtu);
        dev->mtu = new_mtu;

        err = rocker_cmd_set_port_settings_mtu(rocker_port, new_mtu);
        if (err)
                return err;

        if (running)
                err = rocker_port_open(dev);

        return err;
}

static int rocker_port_get_phys_port_name(struct net_device *dev,
                                          char *buf, size_t len)
{
        struct rocker_port *rocker_port = netdev_priv(dev);
        struct port_name name = { .buf = buf, .len = len };
        int err;

        err = rocker_cmd_exec(rocker_port, false,
                              rocker_cmd_get_port_settings_prep, NULL,
                              rocker_cmd_get_port_settings_phys_name_proc,
                              &name);

        return err ? -EOPNOTSUPP : 0;
}

static int rocker_port_change_proto_down(struct net_device *dev,
                                         bool proto_down)
{
        struct rocker_port *rocker_port = netdev_priv(dev);