// SPDX-License-Identifier: GPL-2.0-or-later
/**************************************************************************/
/*                                                                        */
/*  IBM System i and System p Virtual NIC Device Driver                   */
/*  Copyright (C) 2014 IBM Corp.                                          */
/*  Santiago Leon (santi_leon@yahoo.com)                                  */
/*  Thomas Falcon (tlfalcon@linux.vnet.ibm.com)                           */
/*  John Allen (jallen@linux.vnet.ibm.com)                                */
/*                                                                        */
/*                                                                        */
/* This module contains the implementation of a virtual ethernet device   */
/* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN    */
/* option of the RS/6000 Platform Architecture to interface with virtual  */
/* ethernet NICs that are presented to the partition by the hypervisor.   */
/*                                                                         */
/* Messages are passed between the VNIC driver and the VNIC server using  */
/* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to  */
/* issue and receive commands that initiate communication with the server */
/* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but    */
/* are used by the driver to notify the server that a packet is           */
/* ready for transmission or that a buffer has been added to receive a    */
/* packet. Subsequently, sCRQs are used by the server to notify the       */
/* driver that a packet transmission has been completed or that a packet  */
/* has been received and placed in a waiting buffer.                      */
/*                                                                        */
/* In lieu of a more conventional "on-the-fly" DMA mapping strategy in    */
/* which skbs are DMA mapped and immediately unmapped when the transmit   */
/* or receive has been completed, the VNIC driver is required to use      */
/* "long term mapping". This entails that large, continuous DMA mapped    */
/* buffers are allocated on driver initialization and these buffers are   */
/* then continuously reused to pass skbs to and from the VNIC server.     */
/*                                                                        */
/**************************************************************************/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/completion.h>
#include <linux/ioport.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/ethtool.h>
#include <linux/proc_fs.h>
#include <linux/if_arp.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/irq.h>
#include <linux/kthread.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <net/net_namespace.h>
#include <asm/hvcall.h>
#include <linux/atomic.h>
#include <asm/vio.h>
#include <asm/iommu.h>
#include <linux/uaccess.h>
#include <asm/firmware.h>
#include <linux/workqueue.h>
#include <linux/if_vlan.h>
#include <linux/utsname.h>

#include "ibmvnic.h"

static const char ibmvnic_driver_name[] = "ibmvnic";
static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";

MODULE_AUTHOR("Santiago Leon");
MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVNIC_DRIVER_VERSION);

static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
static void release_sub_crqs(struct ibmvnic_adapter *, bool);
static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
static int enable_scrq_irq(struct ibmvnic_adapter *,
                           struct ibmvnic_sub_crq_queue *);
static int disable_scrq_irq(struct ibmvnic_adapter *,
                            struct ibmvnic_sub_crq_queue *);
static int pending_scrq(struct ibmvnic_adapter *,
                        struct ibmvnic_sub_crq_queue *);
static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
                                        struct ibmvnic_sub_crq_queue *);
static int ibmvnic_poll(struct napi_struct *napi, int data);
static void send_query_map(struct ibmvnic_adapter *adapter);
static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, u32, u8);
static int send_request_unmap(struct ibmvnic_adapter *, u8);
static int send_login(struct ibmvnic_adapter *adapter);
static void send_query_cap(struct ibmvnic_adapter *adapter);
static int init_sub_crqs(struct ibmvnic_adapter *);
static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
static void release_crq_queue(struct ibmvnic_adapter *);
static int __ibmvnic_set_mac(struct net_device *, u8 *);
static int init_crq_queue(struct ibmvnic_adapter *adapter);
static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
                                         struct ibmvnic_sub_crq_queue *tx_scrq);
static void free_long_term_buff(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_long_term_buff *ltb);
static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter);

struct ibmvnic_stat {
        char name[ETH_GSTRING_LEN];
        int offset;
};

#define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
                             offsetof(struct ibmvnic_statistics, stat))
#define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))

static const struct ibmvnic_stat ibmvnic_stats[] = {
        {"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
        {"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
        {"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
        {"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
        {"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
        {"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
        {"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
        {"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
        {"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
        {"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
        {"align_errors", IBMVNIC_STAT_OFF(align_errors)},
        {"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
        {"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
        {"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
        {"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
        {"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
        {"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
        {"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
        {"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
        {"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
        {"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
        {"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
};

static int send_crq_init_complete(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
        crq.generic.cmd = IBMVNIC_CRQ_INIT_COMPLETE;

        return ibmvnic_send_crq(adapter, &crq);
}

static int send_version_xchg(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.version_exchange.first = IBMVNIC_CRQ_CMD;
        crq.version_exchange.cmd = VERSION_EXCHANGE;
        crq.version_exchange.version = cpu_to_be16(ibmvnic_version);

        return ibmvnic_send_crq(adapter, &crq);
}

static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
                          unsigned long length, unsigned long *number,
                          unsigned long *irq)
{
        unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
        long rc;

        rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
        *number = retbuf[0];
        *irq = retbuf[1];

        return rc;
}

/**
 * ibmvnic_wait_for_completion - Check device state and wait for completion
 * @adapter: private device data
 * @comp_done: completion structure to wait for
 * @timeout: time to wait in milliseconds
 *
 * Wait for a completion signal or until the timeout limit is reached
 * while checking that the device is still active.
 */
static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
                                       struct completion *comp_done,
                                       unsigned long timeout)
{
        struct net_device *netdev;
        unsigned long div_timeout;
        u8 retry;

        netdev = adapter->netdev;
        retry = 5;
        div_timeout = msecs_to_jiffies(timeout / retry);
        while (true) {
                if (!adapter->crq.active) {
                        netdev_err(netdev, "Device down!\n");
                        return -ENODEV;
                }
                if (!retry--)
                        break;
                if (wait_for_completion_timeout(comp_done, div_timeout))
                        return 0;
        }
        netdev_err(netdev, "Operation timed out.\n");
        return -ETIMEDOUT;
}

/**
 * reuse_ltb() - Check if a long term buffer can be reused
 * @ltb:  The long term buffer to be checked
 * @size: The size of the long term buffer.
 *
 * An LTB can be reused unless its size has changed.
 *
 * Return: Return true if the LTB can be reused, false otherwise.
 */
static bool reuse_ltb(struct ibmvnic_long_term_buff *ltb, int size)
{
        return (ltb->buff && ltb->size == size);
}

/**
 * alloc_long_term_buff() - Allocate a long term buffer (LTB)
 *
 * @adapter: ibmvnic adapter associated to the LTB
 * @ltb:     container object for the LTB
 * @size:    size of the LTB
 *
 * Allocate an LTB of the specified size and notify VIOS.
 *
 * If the given @ltb already has the correct size, reuse it. Otherwise if
 * its non-NULL, free it. Then allocate a new one of the correct size.
 * Notify the VIOS either way since we may now be working with a new VIOS.
 *
 * Allocating larger chunks of memory during resets, specially LPM or under
 * low memory situations can cause resets to fail/timeout and for LPAR to
 * lose connectivity. So hold onto the LTB even if we fail to communicate
 * with the VIOS and reuse it on next open. Free LTB when adapter is closed.
 *
 * Return: 0 if we were able to allocate the LTB and notify the VIOS and
 *         a negative value otherwise.
 */
static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_long_term_buff *ltb, int size)
{
        struct device *dev = &adapter->vdev->dev;
        int rc;

        if (!reuse_ltb(ltb, size)) {
                dev_dbg(dev,
                        "LTB size changed from 0x%llx to 0x%x, reallocating\n",
                         ltb->size, size);
                free_long_term_buff(adapter, ltb);
        }

        if (ltb->buff) {
                dev_dbg(dev, "Reusing LTB [map %d, size 0x%llx]\n",
                        ltb->map_id, ltb->size);
        } else {
                ltb->buff = dma_alloc_coherent(dev, size, &ltb->addr,
                                               GFP_KERNEL);
                if (!ltb->buff) {
                        dev_err(dev, "Couldn't alloc long term buffer\n");
                        return -ENOMEM;
                }
                ltb->size = size;

                ltb->map_id = find_first_zero_bit(adapter->map_ids,
                                                  MAX_MAP_ID);
                bitmap_set(adapter->map_ids, ltb->map_id, 1);

                dev_dbg(dev,
                        "Allocated new LTB [map %d, size 0x%llx]\n",
                         ltb->map_id, ltb->size);
        }

        /* Ensure ltb is zeroed - specially when reusing it. */
        memset(ltb->buff, 0, ltb->size);

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
        if (rc) {
                dev_err(dev, "send_request_map failed, rc = %d\n", rc);
                goto out;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        if (rc) {
                dev_err(dev, "LTB map request aborted or timed out, rc = %d\n",
                        rc);
                goto out;
        }

        if (adapter->fw_done_rc) {
                dev_err(dev, "Couldn't map LTB, rc = %d\n",
                        adapter->fw_done_rc);
                rc = -EIO;
                goto out;
        }
        rc = 0;
out:
        /* don't free LTB on communication error - see function header */
        mutex_unlock(&adapter->fw_lock);
        return rc;
}

static void free_long_term_buff(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_long_term_buff *ltb)
{
        struct device *dev = &adapter->vdev->dev;

        if (!ltb->buff)
                return;

        /* VIOS automatically unmaps the long term buffer at remote
         * end for the following resets:
         * FAILOVER, MOBILITY, TIMEOUT.
         */
        if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
            adapter->reset_reason != VNIC_RESET_MOBILITY &&
            adapter->reset_reason != VNIC_RESET_TIMEOUT)
                send_request_unmap(adapter, ltb->map_id);

        dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);

        ltb->buff = NULL;
        /* mark this map_id free */
        bitmap_clear(adapter->map_ids, ltb->map_id, 1);
        ltb->map_id = 0;
}

static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_active_rx_pools; i++)
                adapter->rx_pool[i].active = 0;
}

static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
                              struct ibmvnic_rx_pool *pool)
{
        int count = pool->size - atomic_read(&pool->available);
        u64 handle = adapter->rx_scrq[pool->index]->handle;
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_ind_xmit_queue *ind_bufp;
        struct ibmvnic_sub_crq_queue *rx_scrq;
        union sub_crq *sub_crq;
        int buffers_added = 0;
        unsigned long lpar_rc;
        struct sk_buff *skb;
        unsigned int offset;
        dma_addr_t dma_addr;
        unsigned char *dst;
        int shift = 0;
        int index;
        int i;

        if (!pool->active)
                return;

        rx_scrq = adapter->rx_scrq[pool->index];
        ind_bufp = &rx_scrq->ind_buf;

        /* netdev_skb_alloc() could have failed after we saved a few skbs
         * in the indir_buf and we would not have sent them to VIOS yet.
         * To account for them, start the loop at ind_bufp->index rather
         * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will
         * be 0.
         */
        for (i = ind_bufp->index; i < count; ++i) {
                index = pool->free_map[pool->next_free];

                /* We maybe reusing the skb from earlier resets. Allocate
                 * only if necessary. But since the LTB may have changed
                 * during reset (see init_rx_pools()), update LTB below
                 * even if reusing skb.
                 */
                skb = pool->rx_buff[index].skb;
                if (!skb) {
                        skb = netdev_alloc_skb(adapter->netdev,
                                               pool->buff_size);
                        if (!skb) {
                                dev_err(dev, "Couldn't replenish rx buff\n");
                                adapter->replenish_no_mem++;
                                break;
                        }
                }

                pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
                pool->next_free = (pool->next_free + 1) % pool->size;

                /* Copy the skb to the long term mapped DMA buffer */
                offset = index * pool->buff_size;
                dst = pool->long_term_buff.buff + offset;
                memset(dst, 0, pool->buff_size);
                dma_addr = pool->long_term_buff.addr + offset;

                /* add the skb to an rx_buff in the pool */
                pool->rx_buff[index].data = dst;
                pool->rx_buff[index].dma = dma_addr;
                pool->rx_buff[index].skb = skb;
                pool->rx_buff[index].pool_index = pool->index;
                pool->rx_buff[index].size = pool->buff_size;

                /* queue the rx_buff for the next send_subcrq_indirect */
                sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
                memset(sub_crq, 0, sizeof(*sub_crq));
                sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
                sub_crq->rx_add.correlator =
                    cpu_to_be64((u64)&pool->rx_buff[index]);
                sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
                sub_crq->rx_add.map_id = pool->long_term_buff.map_id;

                /* The length field of the sCRQ is defined to be 24 bits so the
                 * buffer size needs to be left shifted by a byte before it is
                 * converted to big endian to prevent the last byte from being
                 * truncated.
                 */
#ifdef __LITTLE_ENDIAN__
                shift = 8;
#endif
                sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);

                /* if send_subcrq_indirect queue is full, flush to VIOS */
                if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
                    i == count - 1) {
                        lpar_rc =
                                send_subcrq_indirect(adapter, handle,
                                                     (u64)ind_bufp->indir_dma,
                                                     (u64)ind_bufp->index);
                        if (lpar_rc != H_SUCCESS)
                                goto failure;
                        buffers_added += ind_bufp->index;
                        adapter->replenish_add_buff_success += ind_bufp->index;
                        ind_bufp->index = 0;
                }
        }
        atomic_add(buffers_added, &pool->available);
        return;

failure:
        if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
                dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
        for (i = ind_bufp->index - 1; i >= 0; --i) {
                struct ibmvnic_rx_buff *rx_buff;

                pool->next_free = pool->next_free == 0 ?
                                  pool->size - 1 : pool->next_free - 1;
                sub_crq = &ind_bufp->indir_arr[i];
                rx_buff = (struct ibmvnic_rx_buff *)
                                be64_to_cpu(sub_crq->rx_add.correlator);
                index = (int)(rx_buff - pool->rx_buff);
                pool->free_map[pool->next_free] = index;
                dev_kfree_skb_any(pool->rx_buff[index].skb);
                pool->rx_buff[index].skb = NULL;
        }
        adapter->replenish_add_buff_failure += ind_bufp->index;
        atomic_add(buffers_added, &pool->available);
        ind_bufp->index = 0;
        if (lpar_rc == H_CLOSED || adapter->failover_pending) {
                /* Disable buffer pool replenishment and report carrier off if
                 * queue is closed or pending failover.
                 * Firmware guarantees that a signal will be sent to the
                 * driver, triggering a reset.
                 */
                deactivate_rx_pools(adapter);
                netif_carrier_off(adapter->netdev);
        }
}

static void replenish_pools(struct ibmvnic_adapter *adapter)
{
        int i;

        adapter->replenish_task_cycles++;
        for (i = 0; i < adapter->num_active_rx_pools; i++) {
                if (adapter->rx_pool[i].active)
                        replenish_rx_pool(adapter, &adapter->rx_pool[i]);
        }

        netdev_dbg(adapter->netdev, "Replenished %d pools\n", i);
}

static void release_stats_buffers(struct ibmvnic_adapter *adapter)
{
        kfree(adapter->tx_stats_buffers);
        kfree(adapter->rx_stats_buffers);
        adapter->tx_stats_buffers = NULL;
        adapter->rx_stats_buffers = NULL;
}

static int init_stats_buffers(struct ibmvnic_adapter *adapter)
{
        adapter->tx_stats_buffers =
                                kcalloc(IBMVNIC_MAX_QUEUES,
                                        sizeof(struct ibmvnic_tx_queue_stats),
                                        GFP_KERNEL);
        if (!adapter->tx_stats_buffers)
                return -ENOMEM;

        adapter->rx_stats_buffers =
                                kcalloc(IBMVNIC_MAX_QUEUES,
                                        sizeof(struct ibmvnic_rx_queue_stats),
                                        GFP_KERNEL);
        if (!adapter->rx_stats_buffers)
                return -ENOMEM;

        return 0;
}

static void release_stats_token(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;

        if (!adapter->stats_token)
                return;

        dma_unmap_single(dev, adapter->stats_token,
                         sizeof(struct ibmvnic_statistics),
                         DMA_FROM_DEVICE);
        adapter->stats_token = 0;
}

static int init_stats_token(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        dma_addr_t stok;
        int rc;

        stok = dma_map_single(dev, &adapter->stats,
                              sizeof(struct ibmvnic_statistics),
                              DMA_FROM_DEVICE);
        rc = dma_mapping_error(dev, stok);
        if (rc) {
                dev_err(dev, "Couldn't map stats buffer, rc = %d\n", rc);
                return rc;
        }

        adapter->stats_token = stok;
        netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
        return 0;
}

/**
 * release_rx_pools() - Release any rx pools attached to @adapter.
 * @adapter: ibmvnic adapter
 *
 * Safe to call this multiple times - even if no pools are attached.
 */
static void release_rx_pools(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_rx_pool *rx_pool;
        int i, j;

        if (!adapter->rx_pool)
                return;

        for (i = 0; i < adapter->num_active_rx_pools; i++) {
                rx_pool = &adapter->rx_pool[i];

                netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);

                kfree(rx_pool->free_map);

                free_long_term_buff(adapter, &rx_pool->long_term_buff);

                if (!rx_pool->rx_buff)
                        continue;

                for (j = 0; j < rx_pool->size; j++) {
                        if (rx_pool->rx_buff[j].skb) {
                                dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
                                rx_pool->rx_buff[j].skb = NULL;
                        }
                }

                kfree(rx_pool->rx_buff);
        }

        kfree(adapter->rx_pool);
        adapter->rx_pool = NULL;
        adapter->num_active_rx_pools = 0;
        adapter->prev_rx_pool_size = 0;
}

/**
 * reuse_rx_pools() - Check if the existing rx pools can be reused.
 * @adapter: ibmvnic adapter
 *
 * Check if the existing rx pools in the adapter can be reused. The
 * pools can be reused if the pool parameters (number of pools,
 * number of buffers in the pool and size of each buffer) have not
 * changed.
 *
 * NOTE: This assumes that all pools have the same number of buffers
 *       which is the case currently. If that changes, we must fix this.
 *
 * Return: true if the rx pools can be reused, false otherwise.
 */
static bool reuse_rx_pools(struct ibmvnic_adapter *adapter)
{
        u64 old_num_pools, new_num_pools;
        u64 old_pool_size, new_pool_size;
        u64 old_buff_size, new_buff_size;

        if (!adapter->rx_pool)
                return false;

        old_num_pools = adapter->num_active_rx_pools;
        new_num_pools = adapter->req_rx_queues;

        old_pool_size = adapter->prev_rx_pool_size;
        new_pool_size = adapter->req_rx_add_entries_per_subcrq;

        old_buff_size = adapter->prev_rx_buf_sz;
        new_buff_size = adapter->cur_rx_buf_sz;

        if (old_buff_size != new_buff_size ||
            old_num_pools != new_num_pools ||
            old_pool_size != new_pool_size)
                return false;

        return true;
}

/**
 * init_rx_pools(): Initialize the set of receiver pools in the adapter.
 * @netdev: net device associated with the vnic interface
 *
 * Initialize the set of receiver pools in the ibmvnic adapter associated
 * with the net_device @netdev. If possible, reuse the existing rx pools.
 * Otherwise free any existing pools and  allocate a new set of pools
 * before initializing them.
 *
 * Return: 0 on success and negative value on error.
 */
static int init_rx_pools(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_rx_pool *rx_pool;
        u64 num_pools;
        u64 pool_size;          /* # of buffers in one pool */
        u64 buff_size;
        int i, j, rc;

        pool_size = adapter->req_rx_add_entries_per_subcrq;
        num_pools = adapter->req_rx_queues;
        buff_size = adapter->cur_rx_buf_sz;

        if (reuse_rx_pools(adapter)) {
                dev_dbg(dev, "Reusing rx pools\n");
                goto update_ltb;
        }

        /* Allocate/populate the pools. */
        release_rx_pools(adapter);

        adapter->rx_pool = kcalloc(num_pools,
                                   sizeof(struct ibmvnic_rx_pool),
                                   GFP_KERNEL);
        if (!adapter->rx_pool) {
                dev_err(dev, "Failed to allocate rx pools\n");
                return -ENOMEM;
        }

        /* Set num_active_rx_pools early. If we fail below after partial
         * allocation, release_rx_pools() will know how many to look for.
         */
        adapter->num_active_rx_pools = num_pools;

        for (i = 0; i < num_pools; i++) {
                rx_pool = &adapter->rx_pool[i];

                netdev_dbg(adapter->netdev,
                           "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
                           i, pool_size, buff_size);

                rx_pool->size = pool_size;
                rx_pool->index = i;
                rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);

                rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
                                            GFP_KERNEL);
                if (!rx_pool->free_map) {
                        dev_err(dev, "Couldn't alloc free_map %d\n", i);
                        rc = -ENOMEM;
                        goto out_release;
                }

                rx_pool->rx_buff = kcalloc(rx_pool->size,
                                           sizeof(struct ibmvnic_rx_buff),
                                           GFP_KERNEL);
                if (!rx_pool->rx_buff) {
                        dev_err(dev, "Couldn't alloc rx buffers\n");
                        rc = -ENOMEM;
                        goto out_release;
                }
        }

        adapter->prev_rx_pool_size = pool_size;
        adapter->prev_rx_buf_sz = adapter->cur_rx_buf_sz;

update_ltb:
        for (i = 0; i < num_pools; i++) {
                rx_pool = &adapter->rx_pool[i];
                dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n",
                        i, rx_pool->size, rx_pool->buff_size);

                rc = alloc_long_term_buff(adapter, &rx_pool->long_term_buff,
                                          rx_pool->size * rx_pool->buff_size);
                if (rc)
                        goto out;

                for (j = 0; j < rx_pool->size; ++j) {
                        struct ibmvnic_rx_buff *rx_buff;

                        rx_pool->free_map[j] = j;

                        /* NOTE: Don't clear rx_buff->skb here - will leak
                         * memory! replenish_rx_pool() will reuse skbs or
                         * allocate as necessary.
                         */
                        rx_buff = &rx_pool->rx_buff[j];
                        rx_buff->dma = 0;
                        rx_buff->data = 0;
                        rx_buff->size = 0;
                        rx_buff->pool_index = 0;
                }

                /* Mark pool "empty" so replenish_rx_pools() will
                 * update the LTB info for each buffer
                 */
                atomic_set(&rx_pool->available, 0);
                rx_pool->next_alloc = 0;
                rx_pool->next_free = 0;
                /* replenish_rx_pool() may have called deactivate_rx_pools()
                 * on failover. Ensure pool is active now.
                 */
                rx_pool->active = 1;
        }
        return 0;
out_release:
        release_rx_pools(adapter);
out:
        /* We failed to allocate one or more LTBs or map them on the VIOS.
         * Hold onto the pools and any LTBs that we did allocate/map.
         */
        return rc;
}

static void release_vpd_data(struct ibmvnic_adapter *adapter)
{
        if (!adapter->vpd)
                return;

        kfree(adapter->vpd->buff);
        kfree(adapter->vpd);

        adapter->vpd = NULL;
}

static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_tx_pool *tx_pool)
{
        kfree(tx_pool->tx_buff);
        kfree(tx_pool->free_map);
        free_long_term_buff(adapter, &tx_pool->long_term_buff);
}

/**
 * release_tx_pools() - Release any tx pools attached to @adapter.
 * @adapter: ibmvnic adapter
 *
 * Safe to call this multiple times - even if no pools are attached.
 */
static void release_tx_pools(struct ibmvnic_adapter *adapter)
{
        int i;

        /* init_tx_pools() ensures that ->tx_pool and ->tso_pool are
         * both NULL or both non-NULL. So we only need to check one.
         */
        if (!adapter->tx_pool)
                return;

        for (i = 0; i < adapter->num_active_tx_pools; i++) {
                release_one_tx_pool(adapter, &adapter->tx_pool[i]);
                release_one_tx_pool(adapter, &adapter->tso_pool[i]);
        }

        kfree(adapter->tx_pool);
        adapter->tx_pool = NULL;
        kfree(adapter->tso_pool);
        adapter->tso_pool = NULL;
        adapter->num_active_tx_pools = 0;
        adapter->prev_tx_pool_size = 0;
}

static int init_one_tx_pool(struct net_device *netdev,
                            struct ibmvnic_tx_pool *tx_pool,
                            int pool_size, int buf_size)
{
        int i;

        tx_pool->tx_buff = kcalloc(pool_size,
                                   sizeof(struct ibmvnic_tx_buff),
                                   GFP_KERNEL);
        if (!tx_pool->tx_buff)
                return -ENOMEM;

        tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL);
        if (!tx_pool->free_map) {
                kfree(tx_pool->tx_buff);
                tx_pool->tx_buff = NULL;
                return -ENOMEM;
        }

        for (i = 0; i < pool_size; i++)
                tx_pool->free_map[i] = i;

        tx_pool->consumer_index = 0;
        tx_pool->producer_index = 0;
        tx_pool->num_buffers = pool_size;
        tx_pool->buf_size = buf_size;

        return 0;
}

/**
 * reuse_tx_pools() - Check if the existing tx pools can be reused.
 * @adapter: ibmvnic adapter
 *
 * Check if the existing tx pools in the adapter can be reused. The
 * pools can be reused if the pool parameters (number of pools,
 * number of buffers in the pool and mtu) have not changed.
 *
 * NOTE: This assumes that all pools have the same number of buffers
 *       which is the case currently. If that changes, we must fix this.
 *
 * Return: true if the tx pools can be reused, false otherwise.
 */
static bool reuse_tx_pools(struct ibmvnic_adapter *adapter)
{
        u64 old_num_pools, new_num_pools;
        u64 old_pool_size, new_pool_size;
        u64 old_mtu, new_mtu;

        if (!adapter->tx_pool)
                return false;

        old_num_pools = adapter->num_active_tx_pools;
        new_num_pools = adapter->num_active_tx_scrqs;
        old_pool_size = adapter->prev_tx_pool_size;
        new_pool_size = adapter->req_tx_entries_per_subcrq;
        old_mtu = adapter->prev_mtu;
        new_mtu = adapter->req_mtu;

        if (old_mtu != new_mtu ||
            old_num_pools != new_num_pools ||
            old_pool_size != new_pool_size)
                return false;

        return true;
}

/**
 * init_tx_pools(): Initialize the set of transmit pools in the adapter.
 * @netdev: net device associated with the vnic interface
 *
 * Initialize the set of transmit pools in the ibmvnic adapter associated
 * with the net_device @netdev. If possible, reuse the existing tx pools.
 * Otherwise free any existing pools and  allocate a new set of pools
 * before initializing them.
 *
 * Return: 0 on success and negative value on error.
 */
static int init_tx_pools(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct device *dev = &adapter->vdev->dev;
        int num_pools;
        u64 pool_size;          /* # of buffers in pool */
        u64 buff_size;
        int i, j, rc;

        num_pools = adapter->req_tx_queues;

        /* We must notify the VIOS about the LTB on all resets - but we only
         * need to alloc/populate pools if either the number of buffers or
         * size of each buffer in the pool has changed.
         */
        if (reuse_tx_pools(adapter)) {
                netdev_dbg(netdev, "Reusing tx pools\n");
                goto update_ltb;
        }

        /* Allocate/populate the pools. */
        release_tx_pools(adapter);

        pool_size = adapter->req_tx_entries_per_subcrq;
        num_pools = adapter->num_active_tx_scrqs;

        adapter->tx_pool = kcalloc(num_pools,
                                   sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
        if (!adapter->tx_pool)
                return -ENOMEM;

        adapter->tso_pool = kcalloc(num_pools,
                                    sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
        /* To simplify release_tx_pools() ensure that ->tx_pool and
         * ->tso_pool are either both NULL or both non-NULL.
         */
        if (!adapter->tso_pool) {
                kfree(adapter->tx_pool);
                adapter->tx_pool = NULL;
                return -ENOMEM;
        }

        /* Set num_active_tx_pools early. If we fail below after partial
         * allocation, release_tx_pools() will know how many to look for.
         */
        adapter->num_active_tx_pools = num_pools;

        buff_size = adapter->req_mtu + VLAN_HLEN;
        buff_size = ALIGN(buff_size, L1_CACHE_BYTES);

        for (i = 0; i < num_pools; i++) {
                dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n",
                        i, adapter->req_tx_entries_per_subcrq, buff_size);

                rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
                                      pool_size, buff_size);
                if (rc)
                        goto out_release;

                rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
                                      IBMVNIC_TSO_BUFS,
                                      IBMVNIC_TSO_BUF_SZ);
                if (rc)
                        goto out_release;
        }

        adapter->prev_tx_pool_size = pool_size;
        adapter->prev_mtu = adapter->req_mtu;

update_ltb:
        /* NOTE: All tx_pools have the same number of buffers (which is
         *       same as pool_size). All tso_pools have IBMVNIC_TSO_BUFS
         *       buffers (see calls init_one_tx_pool() for these).
         *       For consistency, we use tx_pool->num_buffers and
         *       tso_pool->num_buffers below.
         */
        rc = -1;
        for (i = 0; i < num_pools; i++) {
                struct ibmvnic_tx_pool *tso_pool;
                struct ibmvnic_tx_pool *tx_pool;
                u32 ltb_size;

                tx_pool = &adapter->tx_pool[i];
                ltb_size = tx_pool->num_buffers * tx_pool->buf_size;
                if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff,
                                         ltb_size))
                        goto out;

                dev_dbg(dev, "Updated LTB for tx pool %d [%p, %d, %d]\n",
                        i, tx_pool->long_term_buff.buff,
                        tx_pool->num_buffers, tx_pool->buf_size);

                tx_pool->consumer_index = 0;
                tx_pool->producer_index = 0;

                for (j = 0; j < tx_pool->num_buffers; j++)
                        tx_pool->free_map[j] = j;

                tso_pool = &adapter->tso_pool[i];
                ltb_size = tso_pool->num_buffers * tso_pool->buf_size;
                if (alloc_long_term_buff(adapter, &tso_pool->long_term_buff,
                                         ltb_size))
                        goto out;

                dev_dbg(dev, "Updated LTB for tso pool %d [%p, %d, %d]\n",
                        i, tso_pool->long_term_buff.buff,
                        tso_pool->num_buffers, tso_pool->buf_size);

                tso_pool->consumer_index = 0;
                tso_pool->producer_index = 0;

                for (j = 0; j < tso_pool->num_buffers; j++)
                        tso_pool->free_map[j] = j;
        }

        return 0;
out_release:
        release_tx_pools(adapter);
out:
        /* We failed to allocate one or more LTBs or map them on the VIOS.
         * Hold onto the pools and any LTBs that we did allocate/map.
         */
        return rc;
}

static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
{
        int i;

        if (adapter->napi_enabled)
                return;

        for (i = 0; i < adapter->req_rx_queues; i++)
                napi_enable(&adapter->napi[i]);

        adapter->napi_enabled = true;
}

static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
{
        int i;

        if (!adapter->napi_enabled)
                return;

        for (i = 0; i < adapter->req_rx_queues; i++) {
                netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
                napi_disable(&adapter->napi[i]);
        }

        adapter->napi_enabled = false;
}

static int init_napi(struct ibmvnic_adapter *adapter)
{
        int i;

        adapter->napi = kcalloc(adapter->req_rx_queues,
                                sizeof(struct napi_struct), GFP_KERNEL);
        if (!adapter->napi)
                return -ENOMEM;

        for (i = 0; i < adapter->req_rx_queues; i++) {
                netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
                netif_napi_add(adapter->netdev, &adapter->napi[i],
                               ibmvnic_poll, NAPI_POLL_WEIGHT);
        }

        adapter->num_active_rx_napi = adapter->req_rx_queues;
        return 0;
}

static void release_napi(struct ibmvnic_adapter *adapter)
{
        int i;

        if (!adapter->napi)
                return;

        for (i = 0; i < adapter->num_active_rx_napi; i++) {
                netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
                netif_napi_del(&adapter->napi[i]);
        }

        kfree(adapter->napi);
        adapter->napi = NULL;
        adapter->num_active_rx_napi = 0;
        adapter->napi_enabled = false;
}

static const char *adapter_state_to_string(enum vnic_state state)
{
        switch (state) {
        case VNIC_PROBING:
                return "PROBING";
        case VNIC_PROBED:
                return "PROBED";
        case VNIC_OPENING:
                return "OPENING";
        case VNIC_OPEN:
                return "OPEN";
        case VNIC_CLOSING:
                return "CLOSING";
        case VNIC_CLOSED:
                return "CLOSED";
        case VNIC_REMOVING:
                return "REMOVING";
        case VNIC_REMOVED:
                return "REMOVED";
        case VNIC_DOWN:
                return "DOWN";
        }
        return "UNKNOWN";
}

static int ibmvnic_login(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        unsigned long timeout = msecs_to_jiffies(20000);
        int retry_count = 0;
        int retries = 10;
        bool retry;
        int rc;

        do {
                retry = false;
                if (retry_count > retries) {
                        netdev_warn(netdev, "Login attempts exceeded\n");
                        return -EACCES;
                }

                adapter->init_done_rc = 0;
                reinit_completion(&adapter->init_done);
                rc = send_login(adapter);
                if (rc)
                        return rc;

                if (!wait_for_completion_timeout(&adapter->init_done,
                                                 timeout)) {
                        netdev_warn(netdev, "Login timed out, retrying...\n");
                        retry = true;
                        adapter->init_done_rc = 0;
                        retry_count++;
                        continue;
                }

                if (adapter->init_done_rc == ABORTED) {
                        netdev_warn(netdev, "Login aborted, retrying...\n");
                        retry = true;
                        adapter->init_done_rc = 0;
                        retry_count++;
                        /* FW or device may be busy, so
                         * wait a bit before retrying login
                         */
                        msleep(500);
                } else if (adapter->init_done_rc == PARTIALSUCCESS) {
                        retry_count++;
                        release_sub_crqs(adapter, 1);

                        retry = true;
                        netdev_dbg(netdev,
                                   "Received partial success, retrying...\n");
                        adapter->init_done_rc = 0;
                        reinit_completion(&adapter->init_done);
                        send_query_cap(adapter);
                        if (!wait_for_completion_timeout(&adapter->init_done,
                                                         timeout)) {
                                netdev_warn(netdev,
                                            "Capabilities query timed out\n");
                                return -ETIMEDOUT;
                        }

                        rc = init_sub_crqs(adapter);
                        if (rc) {
                                netdev_warn(netdev,
                                            "SCRQ initialization failed\n");
                                return rc;
                        }

                        rc = init_sub_crq_irqs(adapter);
                        if (rc) {
                                netdev_warn(netdev,
                                            "SCRQ irq initialization failed\n");
                                return rc;
                        }
                } else if (adapter->init_done_rc) {
                        netdev_warn(netdev, "Adapter login failed, init_done_rc = %d\n",
                                    adapter->init_done_rc);
                        return -EIO;
                }
        } while (retry);

        __ibmvnic_set_mac(netdev, adapter->mac_addr);

        netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state));
        return 0;
}

static void release_login_buffer(struct ibmvnic_adapter *adapter)
{
        kfree(adapter->login_buf);
        adapter->login_buf = NULL;
}

static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
{
        kfree(adapter->login_rsp_buf);
        adapter->login_rsp_buf = NULL;
}

static void release_resources(struct ibmvnic_adapter *adapter)
{
        release_vpd_data(adapter);

        release_napi(adapter);
        release_login_buffer(adapter);
        release_login_rsp_buffer(adapter);
}

static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
{
        struct net_device *netdev = adapter->netdev;
        unsigned long timeout = msecs_to_jiffies(20000);
        union ibmvnic_crq crq;
        bool resend;
        int rc;

        netdev_dbg(netdev, "setting link state %d\n", link_state);

        memset(&crq, 0, sizeof(crq));
        crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
        crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
        crq.logical_link_state.link_state = link_state;

        do {
                resend = false;

                reinit_completion(&adapter->init_done);
                rc = ibmvnic_send_crq(adapter, &crq);
                if (rc) {
                        netdev_err(netdev, "Failed to set link state\n");
                        return rc;
                }

                if (!wait_for_completion_timeout(&adapter->init_done,
                                                 timeout)) {
                        netdev_err(netdev, "timeout setting link state\n");
                        return -ETIMEDOUT;
                }

                if (adapter->init_done_rc == PARTIALSUCCESS) {
                        /* Partuial success, delay and re-send */
                        mdelay(1000);
                        resend = true;
                } else if (adapter->init_done_rc) {
                        netdev_warn(netdev, "Unable to set link state, rc=%d\n",
                                    adapter->init_done_rc);
                        return adapter->init_done_rc;
                }
        } while (resend);

        return 0;
}

static int set_real_num_queues(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc;

        netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n",
                   adapter->req_tx_queues, adapter->req_rx_queues);

        rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues);
        if (rc) {
                netdev_err(netdev, "failed to set the number of tx queues\n");
                return rc;
        }

        rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues);
        if (rc)
                netdev_err(netdev, "failed to set the number of rx queues\n");

        return rc;
}

static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        union ibmvnic_crq crq;
        int len = 0;
        int rc;

        if (adapter->vpd->buff)
                len = adapter->vpd->len;

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
        crq.get_vpd_size.cmd = GET_VPD_SIZE;
        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc) {
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        if (rc) {
                dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }
        mutex_unlock(&adapter->fw_lock);

        if (!adapter->vpd->len)
                return -ENODATA;

        if (!adapter->vpd->buff)
                adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
        else if (adapter->vpd->len != len)
                adapter->vpd->buff =
                        krealloc(adapter->vpd->buff,
                                 adapter->vpd->len, GFP_KERNEL);

        if (!adapter->vpd->buff) {
                dev_err(dev, "Could allocate VPD buffer\n");
                return -ENOMEM;
        }

        adapter->vpd->dma_addr =
                dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
                               DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
                dev_err(dev, "Could not map VPD buffer\n");
                kfree(adapter->vpd->buff);
                adapter->vpd->buff = NULL;
                return -ENOMEM;
        }

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        crq.get_vpd.first = IBMVNIC_CRQ_CMD;
        crq.get_vpd.cmd = GET_VPD;
        crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
        crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc) {
                kfree(adapter->vpd->buff);
                adapter->vpd->buff = NULL;
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        if (rc) {
                dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
                kfree(adapter->vpd->buff);
                adapter->vpd->buff = NULL;
                mutex_unlock(&adapter->fw_lock);
                return rc;
        }

        mutex_unlock(&adapter->fw_lock);
        return 0;
}

static int init_resources(struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int rc;

        rc = set_real_num_queues(netdev);
        if (rc)
                return rc;

        adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
        if (!adapter->vpd)
                return -ENOMEM;

        /* Vital Product Data (VPD) */
        rc = ibmvnic_get_vpd(adapter);
        if (rc) {
                netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
                return rc;
        }

        rc = init_napi(adapter);
        if (rc)
                return rc;

        send_query_map(adapter);

        rc = init_rx_pools(netdev);
        if (rc)
                return rc;

        rc = init_tx_pools(netdev);
        return rc;
}

static int __ibmvnic_open(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        enum vnic_state prev_state = adapter->state;
        int i, rc;

        adapter->state = VNIC_OPENING;
        replenish_pools(adapter);
        ibmvnic_napi_enable(adapter);

        /* We're ready to receive frames, enable the sub-crq interrupts and
         * set the logical link state to up
         */
        for (i = 0; i < adapter->req_rx_queues; i++) {
                netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i);
                if (prev_state == VNIC_CLOSED)
                        enable_irq(adapter->rx_scrq[i]->irq);
                enable_scrq_irq(adapter, adapter->rx_scrq[i]);
        }

        for (i = 0; i < adapter->req_tx_queues; i++) {
                netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i);
                if (prev_state == VNIC_CLOSED)
                        enable_irq(adapter->tx_scrq[i]->irq);
                enable_scrq_irq(adapter, adapter->tx_scrq[i]);
                netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
        }

        rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
        if (rc) {
                ibmvnic_napi_disable(adapter);
                ibmvnic_disable_irqs(adapter);
                return rc;
        }

        netif_tx_start_all_queues(netdev);

        if (prev_state == VNIC_CLOSED) {
                for (i = 0; i < adapter->req_rx_queues; i++)
                        napi_schedule(&adapter->napi[i]);
        }

        adapter->state = VNIC_OPEN;
        return rc;
}

static int ibmvnic_open(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc;

        ASSERT_RTNL();

        /* If device failover is pending or we are about to reset, just set
         * device state and return. Device operation will be handled by reset
         * routine.
         *
         * It should be safe to overwrite the adapter->state here. Since
         * we hold the rtnl, either the reset has not actually started or
         * the rtnl got dropped during the set_link_state() in do_reset().
         * In the former case, no one else is changing the state (again we
         * have the rtnl) and in the latter case, do_reset() will detect and
         * honor our setting below.
         */
        if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) {
                netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n",
                           adapter_state_to_string(adapter->state),
                           adapter->failover_pending);
                adapter->state = VNIC_OPEN;
                rc = 0;
                goto out;
        }

        if (adapter->state != VNIC_CLOSED) {
                rc = ibmvnic_login(netdev);
                if (rc)
                        goto out;

                rc = init_resources(adapter);
                if (rc) {
                        netdev_err(netdev, "failed to initialize resources\n");
                        goto out;
                }
        }

        rc = __ibmvnic_open(netdev);

out:
        /* If open failed and there is a pending failover or in-progress reset,
         * set device state and return. Device operation will be handled by
         * reset routine. See also comments above regarding rtnl.
         */
        if (rc &&
            (adapter->failover_pending || (test_bit(0, &adapter->resetting)))) {
                adapter->state = VNIC_OPEN;
                rc = 0;
        }

        if (rc) {
                release_resources(adapter);
                release_rx_pools(adapter);
                release_tx_pools(adapter);
        }

        return rc;
}

static void clean_rx_pools(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_rx_pool *rx_pool;
        struct ibmvnic_rx_buff *rx_buff;
        u64 rx_entries;
        int rx_scrqs;
        int i, j;

        if (!adapter->rx_pool)
                return;

        rx_scrqs = adapter->num_active_rx_pools;
        rx_entries = adapter->req_rx_add_entries_per_subcrq;

        /* Free any remaining skbs in the rx buffer pools */
        for (i = 0; i < rx_scrqs; i++) {
                rx_pool = &adapter->rx_pool[i];
                if (!rx_pool || !rx_pool->rx_buff)
                        continue;

                netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i);
                for (j = 0; j < rx_entries; j++) {
                        rx_buff = &rx_pool->rx_buff[j];
                        if (rx_buff && rx_buff->skb) {
                                dev_kfree_skb_any(rx_buff->skb);
                                rx_buff->skb = NULL;
                        }
                }
        }
}

static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
                              struct ibmvnic_tx_pool *tx_pool)
{
        struct ibmvnic_tx_buff *tx_buff;
        u64 tx_entries;
        int i;

        if (!tx_pool || !tx_pool->tx_buff)
                return;

        tx_entries = tx_pool->num_buffers;

        for (i = 0; i < tx_entries; i++) {
                tx_buff = &tx_pool->tx_buff[i];
                if (tx_buff && tx_buff->skb) {
                        dev_kfree_skb_any(tx_buff->skb);
                        tx_buff->skb = NULL;
                }
        }
}

static void clean_tx_pools(struct ibmvnic_adapter *adapter)
{
        int tx_scrqs;
        int i;

        if (!adapter->tx_pool || !adapter->tso_pool)
                return;

        tx_scrqs = adapter->num_active_tx_pools;

        /* Free any remaining skbs in the tx buffer pools */
        for (i = 0; i < tx_scrqs; i++) {
                netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i);
                clean_one_tx_pool(adapter, &adapter->tx_pool[i]);
                clean_one_tx_pool(adapter, &adapter->tso_pool[i]);
        }
}

static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int i;

        if (adapter->tx_scrq) {
                for (i = 0; i < adapter->req_tx_queues; i++)
                        if (adapter->tx_scrq[i]->irq) {
                                netdev_dbg(netdev,
                                           "Disabling tx_scrq[%d] irq\n", i);
                                disable_scrq_irq(adapter, adapter->tx_scrq[i]);
                                disable_irq(adapter->tx_scrq[i]->irq);
                        }
        }

        if (adapter->rx_scrq) {
                for (i = 0; i < adapter->req_rx_queues; i++) {
                        if (adapter->rx_scrq[i]->irq) {
                                netdev_dbg(netdev,
                                           "Disabling rx_scrq[%d] irq\n", i);
                                disable_scrq_irq(adapter, adapter->rx_scrq[i]);
                                disable_irq(adapter->rx_scrq[i]->irq);
                        }
                }
        }
}

static void ibmvnic_cleanup(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        /* ensure that transmissions are stopped if called by do_reset */
        if (test_bit(0, &adapter->resetting))
                netif_tx_disable(netdev);
        else
                netif_tx_stop_all_queues(netdev);

        ibmvnic_napi_disable(adapter);
        ibmvnic_disable_irqs(adapter);
}

static int __ibmvnic_close(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc = 0;

        adapter->state = VNIC_CLOSING;
        rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
        adapter->state = VNIC_CLOSED;
        return rc;
}

static int ibmvnic_close(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int rc;

        netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n",
                   adapter_state_to_string(adapter->state),
                   adapter->failover_pending,
                   adapter->force_reset_recovery);

        /* If device failover is pending, just set device state and return.
         * Device operation will be handled by reset routine.
         */
        if (adapter->failover_pending) {
                adapter->state = VNIC_CLOSED;
                return 0;
        }

        rc = __ibmvnic_close(netdev);
        ibmvnic_cleanup(netdev);
        clean_rx_pools(adapter);
        clean_tx_pools(adapter);

        return rc;
}

/**
 * build_hdr_data - creates L2/L3/L4 header data buffer
 * @hdr_field: bitfield determining needed headers
 * @skb: socket buffer
 * @hdr_len: array of header lengths
 * @hdr_data: buffer to write the header to
 *
 * Reads hdr_field to determine which headers are needed by firmware.
 * Builds a buffer containing these headers.  Saves individual header
 * lengths and total buffer length to be used to build descriptors.
 */
static int build_hdr_data(u8 hdr_field, struct sk_buff *skb,
                          int *hdr_len, u8 *hdr_data)
{
        int len = 0;
        u8 *hdr;

        if (skb_vlan_tagged(skb) && !skb_vlan_tag_present(skb))
                hdr_len[0] = sizeof(struct vlan_ethhdr);
        else
                hdr_len[0] = sizeof(struct ethhdr);

        if (skb->protocol == htons(ETH_P_IP)) {
                hdr_len[1] = ip_hdr(skb)->ihl * 4;
                if (ip_hdr(skb)->protocol == IPPROTO_TCP)
                        hdr_len[2] = tcp_hdrlen(skb);
                else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
                        hdr_len[2] = sizeof(struct udphdr);
        } else if (skb->protocol == htons(ETH_P_IPV6)) {
                hdr_len[1] = sizeof(struct ipv6hdr);
                if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
                        hdr_len[2] = tcp_hdrlen(skb);
                else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
                        hdr_len[2] = sizeof(struct udphdr);
        } else if (skb->protocol == htons(ETH_P_ARP)) {
                hdr_len[1] = arp_hdr_len(skb->dev);
                hdr_len[2] = 0;
        }

        memset(hdr_data, 0, 120);
        if ((hdr_field >> 6) & 1) {
                hdr = skb_mac_header(skb);
                memcpy(hdr_data, hdr, hdr_len[0]);
                len += hdr_len[0];
        }

        if ((hdr_field >> 5) & 1) {
                hdr = skb_network_header(skb);
                memcpy(hdr_data + len, hdr, hdr_len[1]);
                len += hdr_len[1];
        }

        if ((hdr_field >> 4) & 1) {
                hdr = skb_transport_header(skb);
                memcpy(hdr_data + len, hdr, hdr_len[2]);
                len += hdr_len[2];
        }
        return len;
}

/**
 * create_hdr_descs - create header and header extension descriptors
 * @hdr_field: bitfield determining needed headers
 * @hdr_data: buffer containing header data
 * @len: length of data buffer
 * @hdr_len: array of individual header lengths
 * @scrq_arr: descriptor array
 *
 * Creates header and, if needed, header extension descriptors and
 * places them in a descriptor array, scrq_arr
 */

static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
                            union sub_crq *scrq_arr)
{
        union sub_crq hdr_desc;
        int tmp_len = len;
        int num_descs = 0;
        u8 *data, *cur;
        int tmp;

        while (tmp_len > 0) {
                cur = hdr_data + len - tmp_len;

                memset(&hdr_desc, 0, sizeof(hdr_desc));
                if (cur != hdr_data) {
                        data = hdr_desc.hdr_ext.data;
                        tmp = tmp_len > 29 ? 29 : tmp_len;
                        hdr_desc.hdr_ext.first = IBMVNIC_CRQ_CMD;
                        hdr_desc.hdr_ext.type = IBMVNIC_HDR_EXT_DESC;
                        hdr_desc.hdr_ext.len = tmp;
                } else {
                        data = hdr_desc.hdr.data;
                        tmp = tmp_len > 24 ? 24 : tmp_len;
                        hdr_desc.hdr.first = IBMVNIC_CRQ_CMD;
                        hdr_desc.hdr.type = IBMVNIC_HDR_DESC;
                        hdr_desc.hdr.len = tmp;
                        hdr_desc.hdr.l2_len = (u8)hdr_len[0];
                        hdr_desc.hdr.l3_len = cpu_to_be16((u16)hdr_len[1]);
                        hdr_desc.hdr.l4_len = (u8)hdr_len[2];
                        hdr_desc.hdr.flag = hdr_field << 1;
                }
                memcpy(data, cur, tmp);
                tmp_len -= tmp;
                *scrq_arr = hdr_desc;
                scrq_arr++;
                num_descs++;
        }

        return num_descs;
}

/**
 * build_hdr_descs_arr - build a header descriptor array
 * @skb: tx socket buffer
 * @indir_arr: indirect array
 * @num_entries: number of descriptors to be sent
 * @hdr_field: bit field determining which headers will be sent
 *
 * This function will build a TX descriptor array with applicable
 * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
 */

static void build_hdr_descs_arr(struct sk_buff *skb,
                                union sub_crq *indir_arr,
                                int *num_entries, u8 hdr_field)
{
        int hdr_len[3] = {0, 0, 0};
        u8 hdr_data[140] = {0};
        int tot_len;

        tot_len = build_hdr_data(hdr_field, skb, hdr_len,
                                 hdr_data);
        *num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
                                         indir_arr + 1);
}

static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
                                    struct net_device *netdev)
{
        /* For some backing devices, mishandling of small packets
         * can result in a loss of connection or TX stall. Device
         * architects recommend that no packet should be smaller
         * than the minimum MTU value provided to the driver, so
         * pad any packets to that length
         */
        if (skb->len < netdev->min_mtu)
                return skb_put_padto(skb, netdev->min_mtu);

        return 0;
}

static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
                                         struct ibmvnic_sub_crq_queue *tx_scrq)
{
        struct ibmvnic_ind_xmit_queue *ind_bufp;
        struct ibmvnic_tx_buff *tx_buff;
        struct ibmvnic_tx_pool *tx_pool;
        union sub_crq tx_scrq_entry;
        int queue_num;
        int entries;
        int index;
        int i;

        ind_bufp = &tx_scrq->ind_buf;
        entries = (u64)ind_bufp->index;
        queue_num = tx_scrq->pool_index;

        for (i = entries - 1; i >= 0; --i) {
                tx_scrq_entry = ind_bufp->indir_arr[i];
                if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
                        continue;
                index = be32_to_cpu(tx_scrq_entry.v1.correlator);
                if (index & IBMVNIC_TSO_POOL_MASK) {
                        tx_pool = &adapter->tso_pool[queue_num];
                        index &= ~IBMVNIC_TSO_POOL_MASK;
                } else {
                        tx_pool = &adapter->tx_pool[queue_num];
                }
                tx_pool->free_map[tx_pool->consumer_index] = index;
                tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
                                          tx_pool->num_buffers - 1 :
                                          tx_pool->consumer_index - 1;
                tx_buff = &tx_pool->tx_buff[index];
                adapter->netdev->stats.tx_packets--;
                adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
                adapter->tx_stats_buffers[queue_num].packets--;
                adapter->tx_stats_buffers[queue_num].bytes -=
                                                tx_buff->skb->len;
                dev_kfree_skb_any(tx_buff->skb);
                tx_buff->skb = NULL;
                adapter->netdev->stats.tx_dropped++;
        }
        ind_bufp->index = 0;
        if (atomic_sub_return(entries, &tx_scrq->used) <=
            (adapter->req_tx_entries_per_subcrq / 2) &&
            __netif_subqueue_stopped(adapter->netdev, queue_num) &&
            !test_bit(0, &adapter->resetting)) {
                netif_wake_subqueue(adapter->netdev, queue_num);
                netdev_dbg(adapter->netdev, "Started queue %d\n",
                           queue_num);
        }
}

static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
                                 struct ibmvnic_sub_crq_queue *tx_scrq)
{
        struct ibmvnic_ind_xmit_queue *ind_bufp;
        u64 dma_addr;
        u64 entries;
        u64 handle;
        int rc;

        ind_bufp = &tx_scrq->ind_buf;
        dma_addr = (u64)ind_bufp->indir_dma;
        entries = (u64)ind_bufp->index;
        handle = tx_scrq->handle;

        if (!entries)
                return 0;
        rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
        if (rc)
                ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
        else
                ind_bufp->index = 0;
        return 0;
}

static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int queue_num = skb_get_queue_mapping(skb);
        u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_ind_xmit_queue *ind_bufp;
        struct ibmvnic_tx_buff *tx_buff = NULL;
        struct ibmvnic_sub_crq_queue *tx_scrq;
        struct ibmvnic_tx_pool *tx_pool;
        unsigned int tx_send_failed = 0;
        netdev_tx_t ret = NETDEV_TX_OK;
        unsigned int tx_map_failed = 0;
        union sub_crq indir_arr[16];
        unsigned int tx_dropped = 0;
        unsigned int tx_packets = 0;
        unsigned int tx_bytes = 0;
        dma_addr_t data_dma_addr;
        struct netdev_queue *txq;
        unsigned long lpar_rc;
        union sub_crq tx_crq;
        unsigned int offset;
        int num_entries = 1;
        unsigned char *dst;
        int index = 0;
        u8 proto = 0;

        tx_scrq = adapter->tx_scrq[queue_num];
        txq = netdev_get_tx_queue(netdev, queue_num);
        ind_bufp = &tx_scrq->ind_buf;

        if (test_bit(0, &adapter->resetting)) {
                dev_kfree_skb_any(skb);

                tx_send_failed++;
                tx_dropped++;
                ret = NETDEV_TX_OK;
                goto out;
        }

        if (ibmvnic_xmit_workarounds(skb, netdev)) {
                tx_dropped++;
                tx_send_failed++;
                ret = NETDEV_TX_OK;
                ibmvnic_tx_scrq_flush(adapter, tx_scrq);
                goto out;
        }
        if (skb_is_gso(skb))
                tx_pool = &adapter->tso_pool[queue_num];
        else
                tx_pool = &adapter->tx_pool[queue_num];

        index = tx_pool->free_map[tx_pool->consumer_index];

        if (index == IBMVNIC_INVALID_MAP) {
                dev_kfree_skb_any(skb);
                tx_send_failed++;
                tx_dropped++;
                ibmvnic_tx_scrq_flush(adapter, tx_scrq);
                ret = NETDEV_TX_OK;
                goto out;
        }

        tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP;

        offset = index * tx_pool->buf_size;
        dst = tx_pool->long_term_buff.buff + offset;
        memset(dst, 0, tx_pool->buf_size);
        data_dma_addr = tx_pool->long_term_buff.addr + offset;

        if (skb_shinfo(skb)->nr_frags) {
                int cur, i;

                /* Copy the head */
                skb_copy_from_linear_data(skb, dst, skb_headlen(skb));
                cur = skb_headlen(skb);

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

                        memcpy(dst + cur, skb_frag_address(frag),
                               skb_frag_size(frag));
                        cur += skb_frag_size(frag);
                }
        } else {
                skb_copy_from_linear_data(skb, dst, skb->len);
        }

        /* post changes to long_term_buff *dst before VIOS accessing it */
        dma_wmb();

        tx_pool->consumer_index =
            (tx_pool->consumer_index + 1) % tx_pool->num_buffers;

        tx_buff = &tx_pool->tx_buff[index];
        tx_buff->skb = skb;
        tx_buff->index = index;
        tx_buff->pool_index = queue_num;

        memset(&tx_crq, 0, sizeof(tx_crq));
        tx_crq.v1.first = IBMVNIC_CRQ_CMD;
        tx_crq.v1.type = IBMVNIC_TX_DESC;
        tx_crq.v1.n_crq_elem = 1;
        tx_crq.v1.n_sge = 1;
        tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED;

        if (skb_is_gso(skb))
                tx_crq.v1.correlator =
                        cpu_to_be32(index | IBMVNIC_TSO_POOL_MASK);
        else
                tx_crq.v1.correlator = cpu_to_be32(index);
        tx_crq.v1.dma_reg = cpu_to_be16(tx_pool->long_term_buff.map_id);
        tx_crq.v1.sge_len = cpu_to_be32(skb->len);
        tx_crq.v1.ioba = cpu_to_be64(data_dma_addr);

        if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) {
                tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT;
                tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci);
        }

        if (skb->protocol == htons(ETH_P_IP)) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
                proto = ip_hdr(skb)->protocol;
        } else if (skb->protocol == htons(ETH_P_IPV6)) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;
                proto = ipv6_hdr(skb)->nexthdr;
        }

        if (proto == IPPROTO_TCP)
                tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
        else if (proto == IPPROTO_UDP)
                tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;

        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
                hdrs += 2;
        }
        if (skb_is_gso(skb)) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_LSO;
                tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
                hdrs += 2;
        }

        if ((*hdrs >> 7) & 1)
                build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);

        tx_crq.v1.n_crq_elem = num_entries;
        tx_buff->num_entries = num_entries;
        /* flush buffer if current entry can not fit */
        if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
                lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
                if (lpar_rc != H_SUCCESS)
                        goto tx_flush_err;
        }

        indir_arr[0] = tx_crq;
        memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
               num_entries * sizeof(struct ibmvnic_generic_scrq));
        ind_bufp->index += num_entries;
        if (__netdev_tx_sent_queue(txq, skb->len,
                                   netdev_xmit_more() &&
                                   ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
                lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
                if (lpar_rc != H_SUCCESS)
                        goto tx_err;
        }

        if (atomic_add_return(num_entries, &tx_scrq->used)
                                        >= adapter->req_tx_entries_per_subcrq) {
                netdev_dbg(netdev, "Stopping queue %d\n", queue_num);
                netif_stop_subqueue(netdev, queue_num);
        }

        tx_packets++;
        tx_bytes += skb->len;
        txq_trans_cond_update(txq);
        ret = NETDEV_TX_OK;
        goto out;

tx_flush_err:
        dev_kfree_skb_any(skb);
        tx_buff->skb = NULL;
        tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
                                  tx_pool->num_buffers - 1 :
                                  tx_pool->consumer_index - 1;
        tx_dropped++;
tx_err:
        if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
                dev_err_ratelimited(dev, "tx: send failed\n");

        if (lpar_rc == H_CLOSED || adapter->failover_pending) {
                /* Disable TX and report carrier off if queue is closed
                 * or pending failover.
                 * Firmware guarantees that a signal will be sent to the
                 * driver, triggering a reset or some other action.
                 */
                netif_tx_stop_all_queues(netdev);
                netif_carrier_off(netdev);
        }
out:
        netdev->stats.tx_dropped += tx_dropped;
        netdev->stats.tx_bytes += tx_bytes;
        netdev->stats.tx_packets += tx_packets;
        adapter->tx_send_failed += tx_send_failed;
        adapter->tx_map_failed += tx_map_failed;
        adapter->tx_stats_buffers[queue_num].packets += tx_packets;
        adapter->tx_stats_buffers[queue_num].bytes += tx_bytes;
        adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped;

        return ret;
}

static void ibmvnic_set_multi(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct netdev_hw_addr *ha;
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.request_capability.first = IBMVNIC_CRQ_CMD;
        crq.request_capability.cmd = REQUEST_CAPABILITY;

        if (netdev->flags & IFF_PROMISC) {
                if (!adapter->promisc_supported)
                        return;
        } else {
                if (netdev->flags & IFF_ALLMULTI) {
                        /* Accept all multicast */
                        memset(&crq, 0, sizeof(crq));
                        crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
                        crq.multicast_ctrl.cmd = MULTICAST_CTRL;
                        crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL;
                        ibmvnic_send_crq(adapter, &crq);
                } else if (netdev_mc_empty(netdev)) {
                        /* Reject all multicast */
                        memset(&crq, 0, sizeof(crq));
                        crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
                        crq.multicast_ctrl.cmd = MULTICAST_CTRL;
                        crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL;
                        ibmvnic_send_crq(adapter, &crq);
                } else {
                        /* Accept one or more multicast(s) */
                        netdev_for_each_mc_addr(ha, netdev) {
                                memset(&crq, 0, sizeof(crq));
                                crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
                                crq.multicast_ctrl.cmd = MULTICAST_CTRL;
                                crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC;
                                ether_addr_copy(&crq.multicast_ctrl.mac_addr[0],
                                                ha->addr);
                                ibmvnic_send_crq(adapter, &crq);
                        }
                }
        }
}

static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        union ibmvnic_crq crq;
        int rc;

        if (!is_valid_ether_addr(dev_addr)) {
                rc = -EADDRNOTAVAIL;
                goto err;
        }

        memset(&crq, 0, sizeof(crq));
        crq.change_mac_addr.first = IBMVNIC_CRQ_CMD;
        crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
        ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);

        mutex_lock(&adapter->fw_lock);
        adapter->fw_done_rc = 0;
        reinit_completion(&adapter->fw_done);

        rc = ibmvnic_send_crq(adapter, &crq);
        if (rc) {
                rc = -EIO;
                mutex_unlock(&adapter->fw_lock);
                goto err;
        }

        rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
        /* netdev->dev_addr is changed in handle_change_mac_rsp function */
        if (rc || adapter->fw_done_rc) {
                rc = -EIO;
                mutex_unlock(&adapter->fw_lock);
                goto err;
        }
        mutex_unlock(&adapter->fw_lock);
        return 0;
err:
        ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
        return rc;
}

static int ibmvnic_set_mac(struct net_device *netdev, void *p)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct sockaddr *addr = p;
        int rc;

        rc = 0;
        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        ether_addr_copy(adapter->mac_addr, addr->sa_data);
        if (adapter->state != VNIC_PROBED)
                rc = __ibmvnic_set_mac(netdev, addr->sa_data);

        return rc;
}

static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
{
        switch (reason) {
        case VNIC_RESET_FAILOVER:
                return "FAILOVER";
        case VNIC_RESET_MOBILITY:
                return "MOBILITY";
        case VNIC_RESET_FATAL:
                return "FATAL";
        case VNIC_RESET_NON_FATAL:
                return "NON_FATAL";
        case VNIC_RESET_TIMEOUT:
                return "TIMEOUT";
        case VNIC_RESET_CHANGE_PARAM:
                return "CHANGE_PARAM";
        case VNIC_RESET_PASSIVE_INIT:
                return "PASSIVE_INIT";
        }
        return "UNKNOWN";
}

/*
 * Initialize the init_done completion and return code values. We
 * can get a transport event just after registering the CRQ and the
 * tasklet will use this to communicate the transport event. To ensure
 * we don't miss the notification/error, initialize these _before_
 * regisering the CRQ.
 */
static inline void reinit_init_done(struct ibmvnic_adapter *adapter)
{
        reinit_completion(&adapter->init_done);
        adapter->init_done_rc = 0;
}

/*
 * do_reset returns zero if we are able to keep processing reset events, or
 * non-zero if we hit a fatal error and must halt.
 */
static int do_reset(struct ibmvnic_adapter *adapter,
                    struct ibmvnic_rwi *rwi, u32 reset_state)
{
        struct net_device *netdev = adapter->netdev;
        u64 old_num_rx_queues, old_num_tx_queues;
        u64 old_num_rx_slots, old_num_tx_slots;
        int rc;

        netdev_dbg(adapter->netdev,
                   "[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n",
                   adapter_state_to_string(adapter->state),
                   adapter->failover_pending,
                   reset_reason_to_string(rwi->reset_reason),
                   adapter_state_to_string(reset_state));

        adapter->reset_reason = rwi->reset_reason;
        /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
        if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
                rtnl_lock();

        /* Now that we have the rtnl lock, clear any pending failover.
         * This will ensure ibmvnic_open() has either completed or will
         * block until failover is complete.
         */
        if (rwi->reset_reason == VNIC_RESET_FAILOVER)
                adapter->failover_pending = false;

        /* read the state and check (again) after getting rtnl */
        reset_state = adapter->state;

        if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
                rc = -EBUSY;
                goto out;
        }

        netif_carrier_off(netdev);

        old_num_rx_queues = adapter->req_rx_queues;
        old_num_tx_queues = adapter->req_tx_queues;
        old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq;
        old_num_tx_slots = adapter->req_tx_entries_per_subcrq;

        ibmvnic_cleanup(netdev);

        if (reset_state == VNIC_OPEN &&
            adapter->reset_reason != VNIC_RESET_MOBILITY &&
            adapter->reset_reason != VNIC_RESET_FAILOVER) {
                if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
                        rc = __ibmvnic_close(netdev);
                        if (rc)
                                goto out;
                } else {
                        adapter->state = VNIC_CLOSING;

                        /* Release the RTNL lock before link state change and
                         * re-acquire after the link state change to allow
                         * linkwatch_event to grab the RTNL lock and run during
                         * a reset.
                         */
                        rtnl_unlock();
                        rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
                        rtnl_lock();
                        if (rc)
                                goto out;

                        if (adapter->state == VNIC_OPEN) {
                                /* When we dropped rtnl, ibmvnic_open() got
                                 * it and noticed that we are resetting and
                                 * set the adapter state to OPEN. Update our
                                 * new "target" state, and resume the reset
                                 * from VNIC_CLOSING state.
                                 */
                                netdev_dbg(netdev,
                                           "Open changed state from %s, updating.\n",
                                           adapter_state_to_string(reset_state));
                                reset_state = VNIC_OPEN;
                                adapter->state = VNIC_CLOSING;
                        }

                        if (adapter->state != VNIC_CLOSING) {
                                /* If someone else changed the adapter state
                                 * when we dropped the rtnl, fail the reset
                                 */
                                rc = -EAGAIN;
                                goto out;
                        }
                        adapter->state = VNIC_CLOSED;
                }
        }

        if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
                release_resources(adapter);
                release_sub_crqs(adapter, 1);
                release_crq_queue(adapter);
        }

        if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
                /* remove the closed state so when we call open it appears
                 * we are coming from the probed state.
                 */
                adapter->state = VNIC_PROBED;

                reinit_init_done(adapter);

                if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
                        rc = init_crq_queue(adapter);
                } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
                        rc = ibmvnic_reenable_crq_queue(adapter);
                        release_sub_crqs(adapter, 1);
                } else {
                        rc = ibmvnic_reset_crq(adapter);
                        if (rc == H_CLOSED || rc == H_SUCCESS) {
                                rc = vio_enable_interrupts(adapter->vdev);
                                if (rc)
                                        netdev_err(adapter->netdev,
                                                   "Reset failed to enable interrupts. rc=%d\n",
                                                   rc);
                        }
                }

                if (rc) {
                        netdev_err(adapter->netdev,
                                   "Reset couldn't initialize crq. rc=%d\n", rc);
                        goto out;
                }

                rc = ibmvnic_reset_init(adapter, true);
                if (rc)
                        goto out;

                /* If the adapter was in PROBE or DOWN state prior to the reset,
                 * exit here.
                 */
                if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) {
                        rc = 0;
                        goto out;
                }

                rc = ibmvnic_login(netdev);
                if (rc)
                        goto out;

                if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
                        rc = init_resources(adapter);
                        if (rc)
                                goto out;
                } else if (adapter->req_rx_queues != old_num_rx_queues ||
                    adapter->req_tx_queues != old_num_tx_queues ||
                    adapter->req_rx_add_entries_per_subcrq !=
                    old_num_rx_slots ||
                    adapter->req_tx_entries_per_subcrq !=
                    old_num_tx_slots ||
                    !adapter->rx_pool ||
                    !adapter->tso_pool ||
                    !adapter->tx_pool) {
                        release_napi(adapter);
                        release_vpd_data(adapter);

                        rc = init_resources(adapter);
                        if (rc)
                                goto out;

                } else {
                        rc = init_tx_pools(netdev);
                        if (rc) {
                                netdev_dbg(netdev,
                                           "init tx pools failed (%d)\n",
                                           rc);
                                goto out;
                        }

                        rc = init_rx_pools(netdev);
                        if (rc) {
                                netdev_dbg(netdev,
                                           "init rx pools failed (%d)\n",
                                           rc);
                                goto out;
                        }
                }
                ibmvnic_disable_irqs(adapter);
        }
        adapter->state = VNIC_CLOSED;

        if (reset_state == VNIC_CLOSED) {
                rc = 0;
                goto out;
        }

        rc = __ibmvnic_open(netdev);
        if (rc) {
                rc = IBMVNIC_OPEN_FAILED;
                goto out;
        }

        /* refresh device's multicast list */
        ibmvnic_set_multi(netdev);

        if (adapter->reset_reason == VNIC_RESET_FAILOVER ||
            adapter->reset_reason == VNIC_RESET_MOBILITY)
                __netdev_notify_peers(netdev);

        rc = 0;

out:
        /* restore the adapter state if reset failed */
        if (rc)
                adapter->state = reset_state;
        /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
        if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
                rtnl_unlock();

        netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n",
                   adapter_state_to_string(adapter->state),
                   adapter->failover_pending, rc);
        return rc;
}

static int do_hard_reset(struct ibmvnic_adapter *adapter,
                         struct ibmvnic_rwi *rwi, u32 reset_state)
{
        struct net_device *netdev = adapter->netdev;
        int rc;

        netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n",
                   reset_reason_to_string(rwi->reset_reason));

        /* read the state and check (again) after getting rtnl */
        reset_state = adapter->state;

        if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
                rc = -EBUSY;
                goto out;
        }

        netif_carrier_off(netdev);
        adapter->reset_reason = rwi->reset_reason;

        ibmvnic_cleanup(netdev);
        release_resources(adapter);
        release_sub_crqs(adapter, 0);
        release_crq_queue(adapter);

        /* remove the closed state so when we call open it appears
         * we are coming from the probed state.
         */
        adapter->state = VNIC_PROBED;

        reinit_init_done(adapter);

        rc = init_crq_queue(adapter);
        if (rc) {
                netdev_err(adapter->netdev,
                           "Couldn't initialize crq. rc=%d\n", rc);
                goto out;
        }

        rc = ibmvnic_reset_init(adapter, false);
        if (rc)
                goto out;

        /* If the adapter was in PROBE or DOWN state prior to the reset,
         * exit here.
         */
        if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN)
                goto out;

        rc = ibmvnic_login(netdev);
        if (rc)
                goto out;

        rc = init_resources(adapter);
        if (rc)
                goto out;

        ibmvnic_disable_irqs(adapter);
        adapter->state = VNIC_CLOSED;

        if (reset_state == VNIC_CLOSED)
                goto out;

        rc = __ibmvnic_open(netdev);
        if (rc) {
                rc = IBMVNIC_OPEN_FAILED;
                goto out;
        }

        __netdev_notify_peers(netdev);
out:
        /* restore adapter state if reset failed */
        if (rc)
                adapter->state = reset_state;
        netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n",
                   adapter_state_to_string(adapter->state),
                   adapter->failover_pending, rc);
        return rc;
}

static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_rwi *rwi;
        unsigned long flags;

        spin_lock_irqsave(&adapter->rwi_lock, flags);

        if (!list_empty(&adapter->rwi_list)) {
                rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
                                       list);
                list_del(&rwi->list);
        } else {
                rwi = NULL;
        }

        spin_unlock_irqrestore(&adapter->rwi_lock, flags);
        return rwi;
}

/**
 * do_passive_init - complete probing when partner device is detected.
 * @adapter: ibmvnic_adapter struct
 *
 * If the ibmvnic device does not have a partner device to communicate with at boot
 * and that partner device comes online at a later time, this function is called
 * to complete the initialization process of ibmvnic device.
 * Caller is expected to hold rtnl_lock().
 *
 * Returns non-zero if sub-CRQs are not initialized properly leaving the device
 * in the down state.
 * Returns 0 upon success and the device is in PROBED state.
 */

static int do_passive_init(struct ibmvnic_adapter *adapter)
{
        unsigned long timeout = msecs_to_jiffies(30000);
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        int rc;

        netdev_dbg(netdev, "Partner device found, probing.\n");

        adapter->state = VNIC_PROBING;
        reinit_completion(&adapter->init_done);
        adapter->init_done_rc = 0;
        adapter->crq.active = true;

        rc = send_crq_init_complete(adapter);
        if (rc)
                goto out;

        rc = send_version_xchg(adapter);
        if (rc)
                netdev_dbg(adapter->netdev, "send_version_xchg failed, rc=%d\n", rc);

        if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
                dev_err(dev, "Initialization sequence timed out\n");
                rc = -ETIMEDOUT;
                goto out;
        }

        rc = init_sub_crqs(adapter);
        if (rc) {
                dev_err(dev, "Initialization of sub crqs failed, rc=%d\n", rc);
                goto out;
        }

        rc = init_sub_crq_irqs(adapter);
        if (rc) {
                dev_err(dev, "Failed to initialize sub crq irqs\n, rc=%d", rc);
                goto init_failed;
        }

        netdev->mtu = adapter->req_mtu - ETH_HLEN;
        netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
        netdev->max_mtu = adapter->max_mtu - ETH_HLEN;

        adapter->state = VNIC_PROBED;
        netdev_dbg(netdev, "Probed successfully. Waiting for signal from partner device.\n");

        return 0;

init_failed:
        release_sub_crqs(adapter, 1);
out:
        adapter->state = VNIC_DOWN;
        return rc;
}

static void __ibmvnic_reset(struct work_struct *work)
{
        struct ibmvnic_adapter *adapter;
        unsigned int timeout = 5000;
        struct ibmvnic_rwi *tmprwi;
        bool saved_state = false;
        struct ibmvnic_rwi *rwi;
        unsigned long flags;
        struct device *dev;
        bool need_reset;
        int num_fails = 0;
        u32 reset_state;
        int rc = 0;

        adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
                dev = &adapter->vdev->dev;

        /* Wait for ibmvnic_probe() to complete. If probe is taking too long
         * or if another reset is in progress, defer work for now. If probe
         * eventually fails it will flush and terminate our work.
         *
         * Three possibilities here:
         * 1. Adpater being removed  - just return
         * 2. Timed out on probe or another reset in progress - delay the work
         * 3. Completed probe - perform any resets in queue
         */
        if (adapter->state == VNIC_PROBING &&
            !wait_for_completion_timeout(&adapter->probe_done, timeout)) {
                dev_err(dev, "Reset thread timed out on probe");
                queue_delayed_work(system_long_wq,
                                   &adapter->ibmvnic_delayed_reset,
                                   IBMVNIC_RESET_DELAY);
                return;
        }

        /* adapter is done with probe (i.e state is never VNIC_PROBING now) */
        if (adapter->state == VNIC_REMOVING)
                return;

        /* ->rwi_list is stable now (no one else is removing entries) */

        /* ibmvnic_probe() may have purged the reset queue after we were
         * scheduled to process a reset so there maybe no resets to process.
         * Before setting the ->resetting bit though, we have to make sure
         * that there is infact a reset to process. Otherwise we may race
         * with ibmvnic_open() and end up leaving the vnic down:
         *
         *      __ibmvnic_reset()           ibmvnic_open()
         *      -----------------           --------------
         *
         *  set ->resetting bit
         *                              find ->resetting bit is set
         *                              set ->state to IBMVNIC_OPEN (i.e
         *                              assume reset will open device)
         *                              return
         *  find reset queue empty
         *  return
         *
         *      Neither performed vnic login/open and vnic stays down
         *
         * If we hold the lock and conditionally set the bit, either we
         * or ibmvnic_open() will complete the open.
         */
        need_reset = false;
        spin_lock(&adapter->rwi_lock);
        if (!list_empty(&adapter->rwi_list)) {
                if (test_and_set_bit_lock(0, &adapter->resetting)) {
                        queue_delayed_work(system_long_wq,
                                           &adapter->ibmvnic_delayed_reset,
                                           IBMVNIC_RESET_DELAY);
                } else {
                        need_reset = true;
                }
        }
        spin_unlock(&adapter->rwi_lock);

        if (!need_reset)
                return;

        rwi = get_next_rwi(adapter);
        while (rwi) {
                spin_lock_irqsave(&adapter->state_lock, flags);

                if (adapter->state == VNIC_REMOVING ||
                    adapter->state == VNIC_REMOVED) {
                        spin_unlock_irqrestore(&adapter->state_lock, flags);
                        kfree(rwi);
                        rc = EBUSY;
                        break;
                }

                if (!saved_state) {
                        reset_state = adapter->state;
                        saved_state = true;
                }
                spin_unlock_irqrestore(&adapter->state_lock, flags);

                if (rwi->reset_reason == VNIC_RESET_PASSIVE_INIT) {
                        rtnl_lock();
                        rc = do_passive_init(adapter);
                        rtnl_unlock();
                        if (!rc)
                                netif_carrier_on(adapter->netdev);
                } else if (adapter->force_reset_recovery) {
                        /* Since we are doing a hard reset now, clear the
                         * failover_pending flag so we don't ignore any
                         * future MOBILITY or other resets.
                         */
                        adapter->failover_pending = false;

                        /* Transport event occurred during previous reset */
                        if (adapter->wait_for_reset) {
                                /* Previous was CHANGE_PARAM; caller locked */
                                adapter->force_reset_recovery = false;
                                rc = do_hard_reset(adapter, rwi, reset_state);
                        } else {
                                rtnl_lock();
                                adapter->force_reset_recovery = false;
                                rc = do_hard_reset(adapter, rwi, reset_state);
                                rtnl_unlock();
                        }
                        if (rc)
                                num_fails++;
                        else
                                num_fails = 0;

                        /* If auto-priority-failover is enabled we can get
                         * back to back failovers during resets, resulting
                         * in at least two failed resets (from high-priority
                         * backing device to low-priority one and then back)
                         * If resets continue to fail beyond that, give the
                         * adapter some time to settle down before retrying.
                         */
                        if (num_fails >= 3) {
                                netdev_dbg(adapter->netdev,
                                           "[S:%s] Hard reset failed %d times, waiting 60 secs\n",
                                           adapter_state_to_string(adapter->state),
                                           num_fails);
                                set_current_state(TASK_UNINTERRUPTIBLE);
                                schedule_timeout(60 * HZ);
                        }
                } else {
                        rc = do_reset(adapter, rwi, reset_state);
                }
                tmprwi = rwi;
                adapter->last_reset_time = jiffies;

                if (rc)
                        netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc);

                rwi = get_next_rwi(adapter);

                /*
                 * If there is another reset queued, free the previous rwi
                 * and process the new reset even if previous reset failed
                 * (the previous reset could have failed because of a fail
                 * over for instance, so process the fail over).
                 *
                 * If there are no resets queued and the previous reset failed,
                 * the adapter would be in an undefined state. So retry the
                 * previous reset as a hard reset.
                 */
                if (rwi)
                        kfree(tmprwi);
                else if (rc)
                        rwi = tmprwi;

                if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
                            rwi->reset_reason == VNIC_RESET_MOBILITY || rc))
                        adapter->force_reset_recovery = true;
        }

        if (adapter->wait_for_reset) {
                adapter->reset_done_rc = rc;
                complete(&adapter->reset_done);
        }

        clear_bit_unlock(0, &adapter->resetting);

        netdev_dbg(adapter->netdev,
                   "[S:%s FRR:%d WFR:%d] Done processing resets\n",
                   adapter_state_to_string(adapter->state),
                   adapter->force_reset_recovery,
                   adapter->wait_for_reset);
}

static void __ibmvnic_delayed_reset(struct work_struct *work)
{
        struct ibmvnic_adapter *adapter;

        adapter = container_of(work, struct ibmvnic_adapter,
                               ibmvnic_delayed_reset.work);
        __ibmvnic_reset(&adapter->ibmvnic_reset);
}

static void flush_reset_queue(struct ibmvnic_adapter *adapter)
{
        struct list_head *entry, *tmp_entry;

        if (!list_empty(&adapter->rwi_list)) {
                list_for_each_safe(entry, tmp_entry, &adapter->rwi_list) {
                        list_del(entry);
                        kfree(list_entry(entry, struct ibmvnic_rwi, list));
                }
        }
}

static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
                         enum ibmvnic_reset_reason reason)
{
        struct net_device *netdev = adapter->netdev;
        struct ibmvnic_rwi *rwi, *tmp;
        unsigned long flags;
        int ret;

        spin_lock_irqsave(&adapter->rwi_lock, flags);

        /* If failover is pending don't schedule any other reset.
         * Instead let the failover complete. If there is already a
         * a failover reset scheduled, we will detect and drop the
         * duplicate reset when walking the ->rwi_list below.
         */
        if (adapter->state == VNIC_REMOVING ||
            adapter->state == VNIC_REMOVED ||
            (adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) {
                ret = EBUSY;
                netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
                goto err;
        }

        list_for_each_entry(tmp, &adapter->rwi_list, list) {
                if (tmp->reset_reason == reason) {
                        netdev_dbg(netdev, "Skipping matching reset, reason=%s\n",
                                   reset_reason_to_string(reason));
                        ret = EBUSY;
                        goto err;
                }
        }

        rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
        if (!rwi) {
                ret = ENOMEM;
                goto err;
        }
        /* if we just received a transport event,
         * flush reset queue and process this reset
         */
        if (adapter->force_reset_recovery)
                flush_reset_queue(adapter);

        rwi->reset_reason = reason;
        list_add_tail(&rwi->list, &adapter->rwi_list);
        netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n",
                   reset_reason_to_string(reason));
        queue_work(system_long_wq, &adapter->ibmvnic_reset);

        ret = 0;
err:
        /* ibmvnic_close() below can block, so drop the lock first */
        spin_unlock_irqrestore(&adapter->rwi_lock, flags);

        if (ret == ENOMEM)
                ibmvnic_close(netdev);

        return -ret;
}

static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
        struct ibmvnic_adapter *adapter = netdev_priv(dev);

        if (test_bit(0, &adapter->resetting)) {
                netdev_err(adapter->netdev,
                           "Adapter is resetting, skip timeout reset\n");
                return;
        }
        /* No queuing up reset until at least 5 seconds (default watchdog val)
         * after last reset
         */
        if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) {
                netdev_dbg(dev, "Not yet time to tx timeout.\n");
                return;
        }
        ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT);
}

static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
                                  struct ibmvnic_rx_buff *rx_buff)
{
        struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index];

        rx_buff->skb = NULL;

        pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff);
        pool->next_alloc = (pool->next_alloc + 1) % pool->size;

        atomic_dec(&pool->available);
}

static int ibmvnic_poll(struct napi_struct *napi, int budget)
{
        struct ibmvnic_sub_crq_queue *rx_scrq;
        struct ibmvnic_adapter *adapter;
        struct net_device *netdev;
        int frames_processed;
        int scrq_num;

        netdev = napi->dev;
        adapter = netdev_priv(netdev);
        scrq_num = (int)(napi - adapter->napi);
        frames_processed = 0;
        rx_scrq = adapter->rx_scrq[scrq_num];

restart_poll:
        while (frames_processed < budget) {
                struct sk_buff *skb;
                struct ibmvnic_rx_buff *rx_buff;
                union sub_crq *next;
                u32 length;
                u16 offset;
                u8 flags = 0;

                if (unlikely(test_bit(0, &adapter->resetting) &&
                             adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
                        enable_scrq_irq(adapter, rx_scrq);
                        napi_complete_done(napi, frames_processed);
                        return frames_processed;
                }

                if (!pending_scrq(adapter, rx_scrq))
                        break;
                next = ibmvnic_next_scrq(adapter, rx_scrq);
                rx_buff = (struct ibmvnic_rx_buff *)
                          be64_to_cpu(next->rx_comp.correlator);
                /* do error checking */
                if (next->rx_comp.rc) {
                        netdev_dbg(netdev, "rx buffer returned with rc %x\n",
                                   be16_to_cpu(next->rx_comp.rc));
                        /* free the entry */
                        next->rx_comp.first = 0;
                        dev_kfree_skb_any(rx_buff->skb);
                        remove_buff_from_pool(adapter, rx_buff);
                        continue;
                } else if (!rx_buff->skb) {
                        /* free the entry */
                        next->rx_comp.first = 0;
                        remove_buff_from_pool(adapter, rx_buff);
                        continue;
                }

                length = be32_to_cpu(next->rx_comp.len);
                offset = be16_to_cpu(next->rx_comp.off_frame_data);
                flags = next->rx_comp.flags;
                skb = rx_buff->skb;
                /* load long_term_buff before copying to skb */
                dma_rmb();
                skb_copy_to_linear_data(skb, rx_buff->data + offset,
                                        length);

                /* VLAN Header has been stripped by the system firmware and
                 * needs to be inserted by the driver
                 */
                if (adapter->rx_vlan_header_insertion &&
                    (flags & IBMVNIC_VLAN_STRIPPED))
                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                               ntohs(next->rx_comp.vlan_tci));

                /* free the entry */
                next->rx_comp.first = 0;
                remove_buff_from_pool(adapter, rx_buff);

                skb_put(skb, length);
                skb->protocol = eth_type_trans(skb, netdev);
                skb_record_rx_queue(skb, scrq_num);

                if (flags & IBMVNIC_IP_CHKSUM_GOOD &&
                    flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) {
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                }

                length = skb->len;
                napi_gro_receive(napi, skb); /* send it up */
                netdev->stats.rx_packets++;