/**************************************************************************/
/*                                                                        */
/*  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 program is free software; you can redistribute it and/or modify  */
/*  it under the terms of the GNU General Public License as published by  */
/*  the Free Software Foundation; either version 2 of the License, or     */
/*  (at your option) any later version.                                   */
/*                                                                        */
/*  This program is distributed in the hope that it will be useful,       */
/*  but WITHOUT ANY WARRANTY; without even the implied warranty of        */
/*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         */
/*  GNU General Public License for more details.                          */
/*                                                                        */
/*  You should have received a copy of the GNU General Public License     */
/*  along with this program.                                              */
/*                                                                        */
/* 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/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/debugfs.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 "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 <santi_leon@yahoo.com>");
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 int ibmvnic_remove(struct vio_dev *);
static void release_sub_crqs(struct ibmvnic_adapter *);
static void release_sub_crqs_no_irqs(struct ibmvnic_adapter *);
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(struct ibmvnic_adapter *adapter, u64 remote_handle,
                       union sub_crq *sub_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_map_query(struct ibmvnic_adapter *adapter);
static void send_request_map(struct ibmvnic_adapter *, dma_addr_t, __be32, u8);
static void send_request_unmap(struct ibmvnic_adapter *, u8);

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 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;
}

/* net_device_ops functions */

static void init_rx_pool(struct ibmvnic_adapter *adapter,
                         struct ibmvnic_rx_pool *rx_pool, int num, int index,
                         int buff_size, int active)
{
        netdev_dbg(adapter->netdev,
                   "Initializing rx_pool %d, %d buffs, %d bytes each\n",
                   index, num, buff_size);
        rx_pool->size = num;
        rx_pool->index = index;
        rx_pool->buff_size = buff_size;
        rx_pool->active = active;
}

static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
                                struct ibmvnic_long_term_buff *ltb, int size)
{
        struct device *dev = &adapter->vdev->dev;

        ltb->size = size;
        ltb->buff = dma_alloc_coherent(dev, ltb->size, &ltb->addr,
                                       GFP_KERNEL);

        if (!ltb->buff) {
                dev_err(dev, "Couldn't alloc long term buffer\n");
                return -ENOMEM;
        }
        ltb->map_id = adapter->map_id;
        adapter->map_id++;

        init_completion(&adapter->fw_done);
        send_request_map(adapter, ltb->addr,
                         ltb->size, ltb->map_id);
        wait_for_completion(&adapter->fw_done);
        return 0;
}

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

        dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
        if (!adapter->failover)
                send_request_unmap(adapter, ltb->map_id);
}

static int alloc_rx_pool(struct ibmvnic_adapter *adapter,
                         struct ibmvnic_rx_pool *pool)
{
        struct device *dev = &adapter->vdev->dev;
        int i;

        pool->free_map = kcalloc(pool->size, sizeof(int), GFP_KERNEL);
        if (!pool->free_map)
                return -ENOMEM;

        pool->rx_buff = kcalloc(pool->size, sizeof(struct ibmvnic_rx_buff),
                                GFP_KERNEL);

        if (!pool->rx_buff) {
                dev_err(dev, "Couldn't alloc rx buffers\n");
                kfree(pool->free_map);
                return -ENOMEM;
        }

        if (alloc_long_term_buff(adapter, &pool->long_term_buff,
                                 pool->size * pool->buff_size)) {
                kfree(pool->free_map);
                kfree(pool->rx_buff);
                return -ENOMEM;
        }

        for (i = 0; i < pool->size; ++i)
                pool->free_map[i] = i;

        atomic_set(&pool->available, 0);
        pool->next_alloc = 0;
        pool->next_free = 0;

        return 0;
}

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

        handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                                      be32_to_cpu(adapter->login_rsp_buf->
                                      off_rxadd_subcrqs));

        for (i = 0; i < count; ++i) {
                skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
                if (!skb) {
                        dev_err(dev, "Couldn't replenish rx buff\n");
                        adapter->replenish_no_mem++;
                        break;
                }

                index = pool->free_map[pool->next_free];

                if (pool->rx_buff[index].skb)
                        dev_err(dev, "Inconsistent free_map!\n");

                /* 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;
                pool->rx_buff[index].data = dst;

                pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
                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;

                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);

                lpar_rc = send_subcrq(adapter, handle_array[pool->index],
                                      &sub_crq);
                if (lpar_rc != H_SUCCESS)
                        goto failure;

                buffers_added++;
                adapter->replenish_add_buff_success++;
                pool->next_free = (pool->next_free + 1) % pool->size;
        }
        atomic_add(buffers_added, &pool->available);
        return;

failure:
        dev_info(dev, "replenish pools failure\n");
        pool->free_map[pool->next_free] = index;
        pool->rx_buff[index].skb = NULL;
        if (!dma_mapping_error(dev, dma_addr))
                dma_unmap_single(dev, dma_addr, pool->buff_size,
                                 DMA_FROM_DEVICE);

        dev_kfree_skb_any(skb);
        adapter->replenish_add_buff_failure++;
        atomic_add(buffers_added, &pool->available);
}

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

        if (adapter->migrated)
                return;

        adapter->replenish_task_cycles++;
        for (i = 0; i < be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
             i++) {
                if (adapter->rx_pool[i].active)
                        replenish_rx_pool(adapter, &adapter->rx_pool[i]);
        }
}

static void free_rx_pool(struct ibmvnic_adapter *adapter,
                         struct ibmvnic_rx_pool *pool)
{
        int i;

        kfree(pool->free_map);
        pool->free_map = NULL;

        if (!pool->rx_buff)
                return;

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

static int ibmvnic_open(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_tx_pool *tx_pool;
        union ibmvnic_crq crq;
        int rxadd_subcrqs;
        u64 *size_array;
        int tx_subcrqs;
        int i, j;

        rxadd_subcrqs =
            be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
        tx_subcrqs =
            be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
        size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                                  be32_to_cpu(adapter->login_rsp_buf->
                                              off_rxadd_buff_size));
        adapter->map_id = 1;
        adapter->napi = kcalloc(adapter->req_rx_queues,
                                sizeof(struct napi_struct), GFP_KERNEL);
        if (!adapter->napi)
                goto alloc_napi_failed;
        for (i = 0; i < adapter->req_rx_queues; i++) {
                netif_napi_add(netdev, &adapter->napi[i], ibmvnic_poll,
                               NAPI_POLL_WEIGHT);
                napi_enable(&adapter->napi[i]);
        }
        adapter->rx_pool =
            kcalloc(rxadd_subcrqs, sizeof(struct ibmvnic_rx_pool), GFP_KERNEL);

        if (!adapter->rx_pool)
                goto rx_pool_arr_alloc_failed;
        send_map_query(adapter);
        for (i = 0; i < rxadd_subcrqs; i++) {
                init_rx_pool(adapter, &adapter->rx_pool[i],
                             adapter->req_rx_add_entries_per_subcrq, i,
                             be64_to_cpu(size_array[i]), 1);
                if (alloc_rx_pool(adapter, &adapter->rx_pool[i])) {
                        dev_err(dev, "Couldn't alloc rx pool\n");
                        goto rx_pool_alloc_failed;
                }
        }
        adapter->tx_pool =
            kcalloc(tx_subcrqs, sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);

        if (!adapter->tx_pool)
                goto tx_pool_arr_alloc_failed;
        for (i = 0; i < tx_subcrqs; i++) {
                tx_pool = &adapter->tx_pool[i];
                tx_pool->tx_buff =
                    kcalloc(adapter->req_tx_entries_per_subcrq,
                            sizeof(struct ibmvnic_tx_buff), GFP_KERNEL);
                if (!tx_pool->tx_buff)
                        goto tx_pool_alloc_failed;

                if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff,
                                         adapter->req_tx_entries_per_subcrq *
                                         adapter->req_mtu))
                        goto tx_ltb_alloc_failed;

                tx_pool->free_map =
                    kcalloc(adapter->req_tx_entries_per_subcrq,
                            sizeof(int), GFP_KERNEL);
                if (!tx_pool->free_map)
                        goto tx_fm_alloc_failed;

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

                tx_pool->consumer_index = 0;
                tx_pool->producer_index = 0;
        }
        adapter->bounce_buffer_size =
            (netdev->mtu + ETH_HLEN - 1) / PAGE_SIZE + 1;
        adapter->bounce_buffer = kmalloc(adapter->bounce_buffer_size,
                                         GFP_KERNEL);
        if (!adapter->bounce_buffer)
                goto bounce_alloc_failed;

        adapter->bounce_buffer_dma = dma_map_single(dev, adapter->bounce_buffer,
                                                    adapter->bounce_buffer_size,
                                                    DMA_TO_DEVICE);
        if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
                dev_err(dev, "Couldn't map tx bounce buffer\n");
                goto bounce_map_failed;
        }
        replenish_pools(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++)
                enable_scrq_irq(adapter, adapter->rx_scrq[i]);

        for (i = 0; i < adapter->req_tx_queues; i++)
                enable_scrq_irq(adapter, adapter->tx_scrq[i]);

        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 = IBMVNIC_LOGICAL_LNK_UP;
        ibmvnic_send_crq(adapter, &crq);

        netif_tx_start_all_queues(netdev);

        return 0;

bounce_map_failed:
        kfree(adapter->bounce_buffer);
bounce_alloc_failed:
        i = tx_subcrqs - 1;
        kfree(adapter->tx_pool[i].free_map);
tx_fm_alloc_failed:
        free_long_term_buff(adapter, &adapter->tx_pool[i].long_term_buff);
tx_ltb_alloc_failed:
        kfree(adapter->tx_pool[i].tx_buff);
tx_pool_alloc_failed:
        for (j = 0; j < i; j++) {
                kfree(adapter->tx_pool[j].tx_buff);
                free_long_term_buff(adapter,
                                    &adapter->tx_pool[j].long_term_buff);
                kfree(adapter->tx_pool[j].free_map);
        }
        kfree(adapter->tx_pool);
        adapter->tx_pool = NULL;
tx_pool_arr_alloc_failed:
        i = rxadd_subcrqs;
rx_pool_alloc_failed:
        for (j = 0; j < i; j++) {
                free_rx_pool(adapter, &adapter->rx_pool[j]);
                free_long_term_buff(adapter,
                                    &adapter->rx_pool[j].long_term_buff);
        }
        kfree(adapter->rx_pool);
        adapter->rx_pool = NULL;
rx_pool_arr_alloc_failed:
        for (i = 0; i < adapter->req_rx_queues; i++)
                napi_disable(&adapter->napi[i]);
alloc_napi_failed:
        return -ENOMEM;
}

static int ibmvnic_close(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct device *dev = &adapter->vdev->dev;
        union ibmvnic_crq crq;
        int i;

        adapter->closing = true;

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

        if (!adapter->failover)
                netif_tx_stop_all_queues(netdev);

        if (adapter->bounce_buffer) {
                if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
                        dma_unmap_single(&adapter->vdev->dev,
                                         adapter->bounce_buffer_dma,
                                         adapter->bounce_buffer_size,
                                         DMA_BIDIRECTIONAL);
                        adapter->bounce_buffer_dma = DMA_ERROR_CODE;
                }
                kfree(adapter->bounce_buffer);
                adapter->bounce_buffer = NULL;
        }

        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 = IBMVNIC_LOGICAL_LNK_DN;
        ibmvnic_send_crq(adapter, &crq);

        for (i = 0; i < be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
             i++) {
                kfree(adapter->tx_pool[i].tx_buff);
                free_long_term_buff(adapter,
                                    &adapter->tx_pool[i].long_term_buff);
                kfree(adapter->tx_pool[i].free_map);
        }
        kfree(adapter->tx_pool);
        adapter->tx_pool = NULL;

        for (i = 0; i < be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
             i++) {
                free_rx_pool(adapter, &adapter->rx_pool[i]);
                free_long_term_buff(adapter,
                                    &adapter->rx_pool[i].long_term_buff);
        }
        kfree(adapter->rx_pool);
        adapter->rx_pool = NULL;

        adapter->closing = false;

        return 0;
}

/**
 * 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
 * @tot_len - total length of data
 *
 * 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;

        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);
        }

        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
 * @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 void 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;
        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++;
        }
}

/**
 * build_hdr_descs_arr - build a header descriptor array
 * @skb - socket buffer
 * @num_entries - number of descriptors to be sent
 * @subcrq - first TX descriptor
 * @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 ibmvnic_tx_buff *txbuff,
                                int *num_entries, u8 hdr_field)
{
        int hdr_len[3] = {0, 0, 0};
        int tot_len, len;
        u8 *hdr_data = txbuff->hdr_data;

        tot_len = build_hdr_data(hdr_field, txbuff->skb, hdr_len,
                                 txbuff->hdr_data);
        len = tot_len;
        len -= 24;
        if (len > 0)
                num_entries += len % 29 ? len / 29 + 1 : len / 29;
        create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
                         txbuff->indir_arr + 1);
}

static int 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_tx_buff *tx_buff = NULL;
        struct ibmvnic_sub_crq_queue *tx_scrq;
        struct ibmvnic_tx_pool *tx_pool;
        unsigned int tx_send_failed = 0;
        unsigned int tx_map_failed = 0;
        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;
        bool used_bounce = false;
        unsigned long lpar_rc;
        union sub_crq tx_crq;
        unsigned int offset;
        int num_entries = 1;
        unsigned char *dst;
        u64 *handle_array;
        int index = 0;
        int ret = 0;

        tx_pool = &adapter->tx_pool[queue_num];
        tx_scrq = adapter->tx_scrq[queue_num];
        txq = netdev_get_tx_queue(netdev, skb_get_queue_mapping(skb));
        handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                                   be32_to_cpu(adapter->login_rsp_buf->
                                               off_txsubm_subcrqs));
        if (adapter->migrated) {
                tx_send_failed++;
                tx_dropped++;
                ret = NETDEV_TX_BUSY;
                goto out;
        }

        index = tx_pool->free_map[tx_pool->consumer_index];
        offset = index * adapter->req_mtu;
        dst = tx_pool->long_term_buff.buff + offset;
        memset(dst, 0, adapter->req_mtu);
        skb_copy_from_linear_data(skb, dst, skb->len);
        data_dma_addr = tx_pool->long_term_buff.addr + offset;

        tx_pool->consumer_index =
            (tx_pool->consumer_index + 1) %
                adapter->req_tx_entries_per_subcrq;

        tx_buff = &tx_pool->tx_buff[index];
        tx_buff->skb = skb;
        tx_buff->data_dma[0] = data_dma_addr;
        tx_buff->data_len[0] = skb->len;
        tx_buff->index = index;
        tx_buff->pool_index = queue_num;
        tx_buff->last_frag = true;
        tx_buff->used_bounce = used_bounce;

        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;
        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) {
                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)) {
                if (ip_hdr(skb)->version == 4)
                        tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
                else if (ip_hdr(skb)->version == 6)
                        tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;

                if (ip_hdr(skb)->protocol == IPPROTO_TCP)
                        tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
                else if (ip_hdr(skb)->protocol != IPPROTO_TCP)
                        tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;
        }

        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
                hdrs += 2;
        }
        /* determine if l2/3/4 headers are sent to firmware */
        if ((*hdrs >> 7) & 1 &&
            (skb->protocol == htons(ETH_P_IP) ||
             skb->protocol == htons(ETH_P_IPV6))) {
                build_hdr_descs_arr(tx_buff, &num_entries, *hdrs);
                tx_crq.v1.n_crq_elem = num_entries;
                tx_buff->indir_arr[0] = tx_crq;
                tx_buff->indir_dma = dma_map_single(dev, tx_buff->indir_arr,
                                                    sizeof(tx_buff->indir_arr),
                                                    DMA_TO_DEVICE);
                if (dma_mapping_error(dev, tx_buff->indir_dma)) {
                        if (!firmware_has_feature(FW_FEATURE_CMO))
                                dev_err(dev, "tx: unable to map descriptor array\n");
                        tx_map_failed++;
                        tx_dropped++;
                        ret = NETDEV_TX_BUSY;
                        goto out;
                }
                lpar_rc = send_subcrq_indirect(adapter, handle_array[queue_num],
                                               (u64)tx_buff->indir_dma,
                                               (u64)num_entries);
        } else {
                lpar_rc = send_subcrq(adapter, handle_array[queue_num],
                                      &tx_crq);
        }
        if (lpar_rc != H_SUCCESS) {
                dev_err(dev, "tx failed with code %ld\n", lpar_rc);

                if (tx_pool->consumer_index == 0)
                        tx_pool->consumer_index =
                                adapter->req_tx_entries_per_subcrq - 1;
                else
                        tx_pool->consumer_index--;

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

        atomic_inc(&tx_scrq->used);

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

        tx_packets++;
        tx_bytes += skb->len;
        txq->trans_start = jiffies;
        ret = NETDEV_TX_OK;

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;

        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, void *p)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        struct sockaddr *addr = p;
        union ibmvnic_crq crq;

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

        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], addr->sa_data);
        ibmvnic_send_crq(adapter, &crq);
        /* netdev->dev_addr is changed in handle_change_mac_rsp function */
        return 0;
}

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

        /* Adapter timed out, resetting it */
        release_sub_crqs(adapter);
        rc = ibmvnic_reset_crq(adapter);
        if (rc)
                dev_err(&adapter->vdev->dev, "Adapter timeout, reset failed\n");
        else
                ibmvnic_send_crq_init(adapter);
}

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 net_device *netdev = napi->dev;
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);
        int scrq_num = (int)(napi - adapter->napi);
        int frames_processed = 0;
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 (!pending_scrq(adapter, adapter->rx_scrq[scrq_num]))
                        break;
                next = ibmvnic_next_scrq(adapter, adapter->rx_scrq[scrq_num]);
                rx_buff =
                    (struct ibmvnic_rx_buff *)be64_to_cpu(next->
                                                          rx_comp.correlator);
                /* do error checking */
                if (next->rx_comp.rc) {
                        netdev_err(netdev, "rx error %x\n", next->rx_comp.rc);
                        /* free the entry */
                        next->rx_comp.first = 0;
                        remove_buff_from_pool(adapter, rx_buff);
                        break;
                }

                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;
                skb_copy_to_linear_data(skb, rx_buff->data + offset,
                                        length);
                skb->vlan_tci = be16_to_cpu(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);

                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++;
                netdev->stats.rx_bytes += length;
                frames_processed++;
        }
        replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);

        if (frames_processed < budget) {
                enable_scrq_irq(adapter, adapter->rx_scrq[scrq_num]);

                napi_complete_done(napi, frames_processed);
                if (pending_scrq(adapter, adapter->rx_scrq[scrq_num]) &&
                    napi_reschedule(napi)) {
                        disable_scrq_irq(adapter, adapter->rx_scrq[scrq_num]);
                        goto restart_poll;
                }
        }
        return frames_processed;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void ibmvnic_netpoll_controller(struct net_device *dev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(dev);
        int i;

        replenish_pools(netdev_priv(dev));
        for (i = 0; i < adapter->req_rx_queues; i++)
                ibmvnic_interrupt_rx(adapter->rx_scrq[i]->irq,
                                     adapter->rx_scrq[i]);
}
#endif

static const struct net_device_ops ibmvnic_netdev_ops = {
        .ndo_open               = ibmvnic_open,
        .ndo_stop               = ibmvnic_close,
        .ndo_start_xmit         = ibmvnic_xmit,
        .ndo_set_rx_mode        = ibmvnic_set_multi,
        .ndo_set_mac_address    = ibmvnic_set_mac,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_tx_timeout         = ibmvnic_tx_timeout,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = ibmvnic_netpoll_controller,
#endif
};

/* ethtool functions */

static int ibmvnic_get_link_ksettings(struct net_device *netdev,
                                      struct ethtool_link_ksettings *cmd)
{
        u32 supported, advertising;

        supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
                          SUPPORTED_FIBRE);
        advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
                            ADVERTISED_FIBRE);
        cmd->base.speed = SPEED_1000;
        cmd->base.duplex = DUPLEX_FULL;
        cmd->base.port = PORT_FIBRE;
        cmd->base.phy_address = 0;
        cmd->base.autoneg = AUTONEG_ENABLE;

        ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
                                                supported);
        ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
                                                advertising);

        return 0;
}

static void ibmvnic_get_drvinfo(struct net_device *dev,
                                struct ethtool_drvinfo *info)
{
        strlcpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
        strlcpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
}

static u32 ibmvnic_get_msglevel(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        return adapter->msg_enable;
}

static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        adapter->msg_enable = data;
}

static u32 ibmvnic_get_link(struct net_device *netdev)
{
        struct ibmvnic_adapter *adapter = netdev_priv(netdev);

        /* Don't need to send a query because we request a logical link up at
         * init and then we wait for link state indications
         */
        return adapter->logical_link_state;
}

static void ibmvnic_get_ringparam(struct net_device *netdev,
                                  struct ethtool_ringparam *ring)
{
        ring->rx_max_pending = 0;
        ring->tx_max_pending = 0;
        ring->rx_mini_max_pending = 0;
        ring->rx_jumbo_max_pending = 0;
        ring->rx_pending = 0;
        ring->tx_pending = 0;
        ring->rx_mini_pending = 0;
        ring->rx_jumbo_pending = 0;
}

static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
        int i;

        if (stringset != ETH_SS_STATS)
                return;

        for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++, data += ETH_GSTRING_LEN)
                memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);
}

static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
{
        switch (sset) {
        case ETH_SS_STATS:
                return ARRAY_SIZE(ibmvnic_stats);
        default:
                return -EOPNOTSUPP;
        }
}

static void ibmvnic_get_ethtool_stats(struct net_device *dev,
                                      struct ethtool_stats *stats, u64 *data)
{
        struct ibmvnic_adapter *adapter = netdev_priv(dev);
        union ibmvnic_crq crq;
        int i;

        memset(&crq, 0, sizeof(crq));
        crq.request_statistics.first = IBMVNIC_CRQ_CMD;
        crq.request_statistics.cmd = REQUEST_STATISTICS;
        crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
        crq.request_statistics.len =
            cpu_to_be32(sizeof(struct ibmvnic_statistics));

        /* Wait for data to be written */
        init_completion(&adapter->stats_done);
        ibmvnic_send_crq(adapter, &crq);
        wait_for_completion(&adapter->stats_done);

        for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
                data[i] = IBMVNIC_GET_STAT(adapter, ibmvnic_stats[i].offset);
}

static const struct ethtool_ops ibmvnic_ethtool_ops = {
        .get_drvinfo            = ibmvnic_get_drvinfo,
        .get_msglevel           = ibmvnic_get_msglevel,
        .set_msglevel           = ibmvnic_set_msglevel,
        .get_link               = ibmvnic_get_link,
        .get_ringparam          = ibmvnic_get_ringparam,
        .get_strings            = ibmvnic_get_strings,
        .get_sset_count         = ibmvnic_get_sset_count,
        .get_ethtool_stats      = ibmvnic_get_ethtool_stats,
        .get_link_ksettings     = ibmvnic_get_link_ksettings,
};

/* Routines for managing CRQs/sCRQs  */

static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
                                  struct ibmvnic_sub_crq_queue *scrq)
{
        struct device *dev = &adapter->vdev->dev;
        long rc;

        netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");

        /* Close the sub-crqs */
        do {
                rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
                                        adapter->vdev->unit_address,
                                        scrq->crq_num);
        } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

        dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
                         DMA_BIDIRECTIONAL);
        free_pages((unsigned long)scrq->msgs, 2);
        kfree(scrq);
}

static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
                                                        *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_sub_crq_queue *scrq;
        int rc;

        scrq = kmalloc(sizeof(*scrq), GFP_ATOMIC);
        if (!scrq)
                return NULL;

        scrq->msgs = (union sub_crq *)__get_free_pages(GFP_ATOMIC, 2);
        memset(scrq->msgs, 0, 4 * PAGE_SIZE);
        if (!scrq->msgs) {
                dev_warn(dev, "Couldn't allocate crq queue messages page\n");
                goto zero_page_failed;
        }

        scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE,
                                         DMA_BIDIRECTIONAL);
        if (dma_mapping_error(dev, scrq->msg_token)) {
                dev_warn(dev, "Couldn't map crq queue messages page\n");
                goto map_failed;
        }

        rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
                           4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);

        if (rc == H_RESOURCE)
                rc = ibmvnic_reset_crq(adapter);

        if (rc == H_CLOSED) {
                dev_warn(dev, "Partner adapter not ready, waiting.\n");
        } else if (rc) {
                dev_warn(dev, "Error %d registering sub-crq\n", rc);
                goto reg_failed;
        }

        scrq->adapter = adapter;
        scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
        scrq->cur = 0;
        atomic_set(&scrq->used, 0);
        scrq->rx_skb_top = NULL;
        spin_lock_init(&scrq->lock);

        netdev_dbg(adapter->netdev,
                   "sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n",
                   scrq->crq_num, scrq->hw_irq, scrq->irq);

        return scrq;

reg_failed:
        dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
                         DMA_BIDIRECTIONAL);
map_failed:
        free_pages((unsigned long)scrq->msgs, 2);
zero_page_failed:
        kfree(scrq);

        return NULL;
}

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

        if (adapter->tx_scrq) {
                for (i = 0; i < adapter->req_tx_queues; i++)
                        if (adapter->tx_scrq[i]) {
                                free_irq(adapter->tx_scrq[i]->irq,
                                         adapter->tx_scrq[i]);
                                irq_dispose_mapping(adapter->tx_scrq[i]->irq);
                                release_sub_crq_queue(adapter,
                                                      adapter->tx_scrq[i]);
                        }
                kfree(adapter->tx_scrq);
                adapter->tx_scrq = NULL;
        }

        if (adapter->rx_scrq) {
                for (i = 0; i < adapter->req_rx_queues; i++)
                        if (adapter->rx_scrq[i]) {
                                free_irq(adapter->rx_scrq[i]->irq,
                                         adapter->rx_scrq[i]);
                                irq_dispose_mapping(adapter->rx_scrq[i]->irq);
                                release_sub_crq_queue(adapter,
                                                      adapter->rx_scrq[i]);
                        }
                kfree(adapter->rx_scrq);
                adapter->rx_scrq = NULL;
        }
}

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

        if (adapter->tx_scrq) {
                for (i = 0; i < adapter->req_tx_queues; i++)
                        if (adapter->tx_scrq[i])
                                release_sub_crq_queue(adapter,
                                                      adapter->tx_scrq[i]);
                adapter->tx_scrq = NULL;
        }

        if (adapter->rx_scrq) {
                for (i = 0; i < adapter->req_rx_queues; i++)
                        if (adapter->rx_scrq[i])
                                release_sub_crq_queue(adapter,
                                                      adapter->rx_scrq[i]);
                adapter->rx_scrq = NULL;
        }
}

static int disable_scrq_irq(struct ibmvnic_adapter *adapter,
                            struct ibmvnic_sub_crq_queue *scrq)
{
        struct device *dev = &adapter->vdev->dev;
        unsigned long rc;

        rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
                                H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
        if (rc)
                dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n",
                        scrq->hw_irq, rc);
        return rc;
}

static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
                           struct ibmvnic_sub_crq_queue *scrq)
{
        struct device *dev = &adapter->vdev->dev;
        unsigned long rc;

        if (scrq->hw_irq > 0x100000000ULL) {
                dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq);
                return 1;
        }

        rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
                                H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
        if (rc)
                dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n",
                        scrq->hw_irq, rc);
        return rc;
}

static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
                               struct ibmvnic_sub_crq_queue *scrq)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_tx_buff *txbuff;
        union sub_crq *next;
        int index;
        int i, j;
        u8 first;

restart_loop:
        while (pending_scrq(adapter, scrq)) {
                unsigned int pool = scrq->pool_index;

                next = ibmvnic_next_scrq(adapter, scrq);
                for (i = 0; i < next->tx_comp.num_comps; i++) {
                        if (next->tx_comp.rcs[i]) {
                                dev_err(dev, "tx error %x\n",
                                        next->tx_comp.rcs[i]);
                                continue;
                        }
                        index = be32_to_cpu(next->tx_comp.correlators[i]);
                        txbuff = &adapter->tx_pool[pool].tx_buff[index];

                        for (j = 0; j < IBMVNIC_MAX_FRAGS_PER_CRQ; j++) {
                                if (!txbuff->data_dma[j])
                                        continue;

                                txbuff->data_dma[j] = 0;
                                txbuff->used_bounce = false;
                        }
                        /* if sub_crq was sent indirectly */
                        first = txbuff->indir_arr[0].generic.first;
                        if (first == IBMVNIC_CRQ_CMD) {
                                dma_unmap_single(dev, txbuff->indir_dma,
                                                 sizeof(txbuff->indir_arr),
                                                 DMA_TO_DEVICE);
                        }

                        if (txbuff->last_frag) {
                                atomic_dec(&scrq->used);

                                if (atomic_read(&scrq->used) <=
                                    (adapter->req_tx_entries_per_subcrq / 2) &&
                                    netif_subqueue_stopped(adapter->netdev,
                                                           txbuff->skb)) {
                                        netif_wake_subqueue(adapter->netdev,
                                                            scrq->pool_index);
                                        netdev_dbg(adapter->netdev,
                                                   "Started queue %d\n",
                                                   scrq->pool_index);
                                }

                                dev_kfree_skb_any(txbuff->skb);
                        }

                        adapter->tx_pool[pool].free_map[adapter->tx_pool[pool].
                                                     producer_index] = index;
                        adapter->tx_pool[pool].producer_index =
                            (adapter->tx_pool[pool].producer_index + 1) %
                            adapter->req_tx_entries_per_subcrq;
                }
                /* remove tx_comp scrq*/
                next->tx_comp.first = 0;
        }

        enable_scrq_irq(adapter, scrq);

        if (pending_scrq(adapter, scrq)) {
                disable_scrq_irq(adapter, scrq);
                goto restart_loop;
        }

        return 0;
}

static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance)
{
        struct ibmvnic_sub_crq_queue *scrq = instance;
        struct ibmvnic_adapter *adapter = scrq->adapter;

        disable_scrq_irq(adapter, scrq);
        ibmvnic_complete_tx(adapter, scrq);

        return IRQ_HANDLED;
}

static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance)
{
        struct ibmvnic_sub_crq_queue *scrq = instance;
        struct ibmvnic_adapter *adapter = scrq->adapter;

        if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) {
                disable_scrq_irq(adapter, scrq);
                __napi_schedule(&adapter->napi[scrq->scrq_num]);
        }

        return IRQ_HANDLED;
}

static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_sub_crq_queue *scrq;
        int i = 0, j = 0;
        int rc = 0;

        for (i = 0; i < adapter->req_tx_queues; i++) {
                scrq = adapter->tx_scrq[i];
                scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);

                if (!scrq->irq) {
                        rc = -EINVAL;
                        dev_err(dev, "Error mapping irq\n");
                        goto req_tx_irq_failed;
                }

                rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
                                 0, "ibmvnic_tx", scrq);

                if (rc) {
                        dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
                                scrq->irq, rc);
                        irq_dispose_mapping(scrq->irq);
                        goto req_rx_irq_failed;
                }
        }

        for (i = 0; i < adapter->req_rx_queues; i++) {
                scrq = adapter->rx_scrq[i];
                scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
                if (!scrq->irq) {
                        rc = -EINVAL;
                        dev_err(dev, "Error mapping irq\n");
                        goto req_rx_irq_failed;
                }
                rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
                                 0, "ibmvnic_rx", scrq);
                if (rc) {
                        dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
                                scrq->irq, rc);
                        irq_dispose_mapping(scrq->irq);
                        goto req_rx_irq_failed;
                }
        }
        return rc;

req_rx_irq_failed:
        for (j = 0; j < i; j++) {
                free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]);
                irq_dispose_mapping(adapter->rx_scrq[j]->irq);
        }
        i = adapter->req_tx_queues;
req_tx_irq_failed:
        for (j = 0; j < i; j++) {
                free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
                irq_dispose_mapping(adapter->rx_scrq[j]->irq);
        }
        release_sub_crqs_no_irqs(adapter);
        return rc;
}

static void init_sub_crqs(struct ibmvnic_adapter *adapter, int retry)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_sub_crq_queue **allqueues;
        int registered_queues = 0;
        union ibmvnic_crq crq;
        int total_queues;
        int more = 0;
        int i;

        if (!retry) {
                /* Sub-CRQ entries are 32 byte long */
                int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4);

                if (adapter->min_tx_entries_per_subcrq > entries_page ||
                    adapter->min_rx_add_entries_per_subcrq > entries_page) {
                        dev_err(dev, "Fatal, invalid entries per sub-crq\n");
                        goto allqueues_failed;
                }

                /* Get the minimum between the queried max and the entries
                 * that fit in our PAGE_SIZE
                 */
                adapter->req_tx_entries_per_subcrq =
                    adapter->max_tx_entries_per_subcrq > entries_page ?
                    entries_page : adapter->max_tx_entries_per_subcrq;
                adapter->req_rx_add_entries_per_subcrq =
                    adapter->max_rx_add_entries_per_subcrq > entries_page ?
                    entries_page : adapter->max_rx_add_entries_per_subcrq;

                adapter->req_tx_queues = adapter->opt_tx_comp_sub_queues;
                adapter->req_rx_queues = adapter->opt_rx_comp_queues;
                adapter->req_rx_add_queues = adapter->max_rx_add_queues;

                adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN;
        }

        total_queues = adapter->req_tx_queues + adapter->req_rx_queues;

        allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_ATOMIC);
        if (!allqueues)
                goto allqueues_failed;

        for (i = 0; i < total_queues; i++) {
                allqueues[i] = init_sub_crq_queue(adapter);
                if (!allqueues[i]) {
                        dev_warn(dev, "Couldn't allocate all sub-crqs\n");
                        break;
                }
                registered_queues++;
        }

        /* Make sure we were able to register the minimum number of queues */
        if (registered_queues <
            adapter->min_tx_queues + adapter->min_rx_queues) {
                dev_err(dev, "Fatal: Couldn't init  min number of sub-crqs\n");
                goto tx_failed;
        }

        /* Distribute the failed allocated queues*/
        for (i = 0; i < total_queues - registered_queues + more ; i++) {
                netdev_dbg(adapter->netdev, "Reducing number of queues\n");
                switch (i % 3) {
                case 0:
                        if (adapter->req_rx_queues > adapter->min_rx_queues)
                                adapter->req_rx_queues--;
                        else
                                more++;
                        break;
                case 1:
                        if (adapter->req_tx_queues > adapter->min_tx_queues)
                                adapter->req_tx_queues--;
                        else
                                more++;
                        break;
                }
        }

        adapter->tx_scrq = kcalloc(adapter->req_tx_queues,
                                   sizeof(*adapter->tx_scrq), GFP_ATOMIC);
        if (!adapter->tx_scrq)
                goto tx_failed;

        for (i = 0; i < adapter->req_tx_queues; i++) {
                adapter->tx_scrq[i] = allqueues[i];
                adapter->tx_scrq[i]->pool_index = i;
        }

        adapter->rx_scrq = kcalloc(adapter->req_rx_queues,
                                   sizeof(*adapter->rx_scrq), GFP_ATOMIC);
        if (!adapter->rx_scrq)
                goto rx_failed;

        for (i = 0; i < adapter->req_rx_queues; i++) {
                adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues];
                adapter->rx_scrq[i]->scrq_num = i;
        }

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

        crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES);
        crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES);
        crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES);
        crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability =
            cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ);
        crq.request_capability.number =
            cpu_to_be64(adapter->req_tx_entries_per_subcrq);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability =
            cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ);
        crq.request_capability.number =
            cpu_to_be64(adapter->req_rx_add_entries_per_subcrq);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.request_capability.capability = cpu_to_be16(REQ_MTU);
        crq.request_capability.number = cpu_to_be64(adapter->req_mtu);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        if (adapter->netdev->flags & IFF_PROMISC) {
                if (adapter->promisc_supported) {
                        crq.request_capability.capability =
                            cpu_to_be16(PROMISC_REQUESTED);
                        crq.request_capability.number = cpu_to_be64(1);
                        atomic_inc(&adapter->running_cap_crqs);
                        ibmvnic_send_crq(adapter, &crq);
                }
        } else {
                crq.request_capability.capability =
                    cpu_to_be16(PROMISC_REQUESTED);
                crq.request_capability.number = cpu_to_be64(0);
                atomic_inc(&adapter->running_cap_crqs);
                ibmvnic_send_crq(adapter, &crq);
        }

        kfree(allqueues);

        return;

rx_failed:
        kfree(adapter->tx_scrq);
        adapter->tx_scrq = NULL;
tx_failed:
        for (i = 0; i < registered_queues; i++)
                release_sub_crq_queue(adapter, allqueues[i]);
        kfree(allqueues);
allqueues_failed:
        ibmvnic_remove(adapter->vdev);
}

static int pending_scrq(struct ibmvnic_adapter *adapter,
                        struct ibmvnic_sub_crq_queue *scrq)
{
        union sub_crq *entry = &scrq->msgs[scrq->cur];

        if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP || adapter->closing)
                return 1;
        else
                return 0;
}

static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
                                        struct ibmvnic_sub_crq_queue *scrq)
{
        union sub_crq *entry;
        unsigned long flags;

        spin_lock_irqsave(&scrq->lock, flags);
        entry = &scrq->msgs[scrq->cur];
        if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) {
                if (++scrq->cur == scrq->size)
                        scrq->cur = 0;
        } else {
                entry = NULL;
        }
        spin_unlock_irqrestore(&scrq->lock, flags);

        return entry;
}

static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_crq_queue *queue = &adapter->crq;
        union ibmvnic_crq *crq;

        crq = &queue->msgs[queue->cur];
        if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) {
                if (++queue->cur == queue->size)
                        queue->cur = 0;
        } else {
                crq = NULL;
        }

        return crq;
}

static int send_subcrq(struct ibmvnic_adapter *adapter, u64 remote_handle,
                       union sub_crq *sub_crq)
{
        unsigned int ua = adapter->vdev->unit_address;
        struct device *dev = &adapter->vdev->dev;
        u64 *u64_crq = (u64 *)sub_crq;
        int rc;

        netdev_dbg(adapter->netdev,
                   "Sending sCRQ %016lx: %016lx %016lx %016lx %016lx\n",
                   (unsigned long int)cpu_to_be64(remote_handle),
                   (unsigned long int)cpu_to_be64(u64_crq[0]),
                   (unsigned long int)cpu_to_be64(u64_crq[1]),
                   (unsigned long int)cpu_to_be64(u64_crq[2]),
                   (unsigned long int)cpu_to_be64(u64_crq[3]));

        /* Make sure the hypervisor sees the complete request */
        mb();

        rc = plpar_hcall_norets(H_SEND_SUB_CRQ, ua,
                                cpu_to_be64(remote_handle),
                                cpu_to_be64(u64_crq[0]),
                                cpu_to_be64(u64_crq[1]),
                                cpu_to_be64(u64_crq[2]),
                                cpu_to_be64(u64_crq[3]));

        if (rc) {
                if (rc == H_CLOSED)
                        dev_warn(dev, "CRQ Queue closed\n");
                dev_err(dev, "Send error (rc=%d)\n", rc);
        }

        return rc;
}

static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
                                u64 remote_handle, u64 ioba, u64 num_entries)
{
        unsigned int ua = adapter->vdev->unit_address;
        struct device *dev = &adapter->vdev->dev;
        int rc;

        /* Make sure the hypervisor sees the complete request */
        mb();
        rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
                                cpu_to_be64(remote_handle),
                                ioba, num_entries);

        if (rc) {
                if (rc == H_CLOSED)
                        dev_warn(dev, "CRQ Queue closed\n");
                dev_err(dev, "Send (indirect) error (rc=%d)\n", rc);
        }

        return rc;
}

static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
                            union ibmvnic_crq *crq)
{
        unsigned int ua = adapter->vdev->unit_address;
        struct device *dev = &adapter->vdev->dev;
        u64 *u64_crq = (u64 *)crq;
        int rc;

        netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
                   (unsigned long int)cpu_to_be64(u64_crq[0]),
                   (unsigned long int)cpu_to_be64(u64_crq[1]));

        /* Make sure the hypervisor sees the complete request */
        mb();

        rc = plpar_hcall_norets(H_SEND_CRQ, ua,
                                cpu_to_be64(u64_crq[0]),
                                cpu_to_be64(u64_crq[1]));

        if (rc) {
                if (rc == H_CLOSED)
                        dev_warn(dev, "CRQ Queue closed\n");
                dev_warn(dev, "Send error (rc=%d)\n", rc);
        }

        return rc;
}

static int ibmvnic_send_crq_init(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;
        netdev_dbg(adapter->netdev, "Sending CRQ init\n");

        return ibmvnic_send_crq(adapter, &crq);
}

static int ibmvnic_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;
        netdev_dbg(adapter->netdev, "Sending CRQ init complete\n");

        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 void send_login(struct ibmvnic_adapter *adapter)
{
        struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
        struct ibmvnic_login_buffer *login_buffer;
        struct ibmvnic_inflight_cmd *inflight_cmd;
        struct device *dev = &adapter->vdev->dev;
        dma_addr_t rsp_buffer_token;
        dma_addr_t buffer_token;
        size_t rsp_buffer_size;
        union ibmvnic_crq crq;
        unsigned long flags;
        size_t buffer_size;
        __be64 *tx_list_p;
        __be64 *rx_list_p;
        int i;

        buffer_size =
            sizeof(struct ibmvnic_login_buffer) +
            sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues);

        login_buffer = kmalloc(buffer_size, GFP_ATOMIC);
        if (!login_buffer)
                goto buf_alloc_failed;

        buffer_token = dma_map_single(dev, login_buffer, buffer_size,
                                      DMA_TO_DEVICE);
        if (dma_mapping_error(dev, buffer_token)) {
                dev_err(dev, "Couldn't map login buffer\n");
                goto buf_map_failed;
        }

        rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) +
                          sizeof(u64) * adapter->req_tx_queues +
                          sizeof(u64) * adapter->req_rx_queues +
                          sizeof(u64) * adapter->req_rx_queues +
                          sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS;

        login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC);
        if (!login_rsp_buffer)
                goto buf_rsp_alloc_failed;

        rsp_buffer_token = dma_map_single(dev, login_rsp_buffer,
                                          rsp_buffer_size, DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, rsp_buffer_token)) {
                dev_err(dev, "Couldn't map login rsp buffer\n");
                goto buf_rsp_map_failed;
        }
        inflight_cmd = kmalloc(sizeof(*inflight_cmd), GFP_ATOMIC);
        if (!inflight_cmd) {
                dev_err(dev, "Couldn't allocate inflight_cmd\n");
                goto inflight_alloc_failed;
        }
        adapter->login_buf = login_buffer;
        adapter->login_buf_token = buffer_token;
        adapter->login_buf_sz = buffer_size;
        adapter->login_rsp_buf = login_rsp_buffer;
        adapter->login_rsp_buf_token = rsp_buffer_token;
        adapter->login_rsp_buf_sz = rsp_buffer_size;

        login_buffer->len = cpu_to_be32(buffer_size);
        login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB);
        login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues);
        login_buffer->off_txcomp_subcrqs =
            cpu_to_be32(sizeof(struct ibmvnic_login_buffer));
        login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues);
        login_buffer->off_rxcomp_subcrqs =
            cpu_to_be32(sizeof(struct ibmvnic_login_buffer) +
                        sizeof(u64) * adapter->req_tx_queues);
        login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token);
        login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size);

        tx_list_p = (__be64 *)((char *)login_buffer +
                                      sizeof(struct ibmvnic_login_buffer));
        rx_list_p = (__be64 *)((char *)login_buffer +
                                      sizeof(struct ibmvnic_login_buffer) +
                                      sizeof(u64) * adapter->req_tx_queues);

        for (i = 0; i < adapter->req_tx_queues; i++) {
                if (adapter->tx_scrq[i]) {
                        tx_list_p[i] = cpu_to_be64(adapter->tx_scrq[i]->
                                                   crq_num);
                }
        }

        for (i = 0; i < adapter->req_rx_queues; i++) {
                if (adapter->rx_scrq[i]) {
                        rx_list_p[i] = cpu_to_be64(adapter->rx_scrq[i]->
                                                   crq_num);
                }
        }

        netdev_dbg(adapter->netdev, "Login Buffer:\n");
        for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
                netdev_dbg(adapter->netdev, "%016lx\n",
                           ((unsigned long int *)(adapter->login_buf))[i]);
        }

        memset(&crq, 0, sizeof(crq));
        crq.login.first = IBMVNIC_CRQ_CMD;
        crq.login.cmd = LOGIN;
        crq.login.ioba = cpu_to_be32(buffer_token);
        crq.login.len = cpu_to_be32(buffer_size);

        memcpy(&inflight_cmd->crq, &crq, sizeof(crq));

        spin_lock_irqsave(&adapter->inflight_lock, flags);
        list_add_tail(&inflight_cmd->list, &adapter->inflight);
        spin_unlock_irqrestore(&adapter->inflight_lock, flags);

        ibmvnic_send_crq(adapter, &crq);

        return;

inflight_alloc_failed:
        dma_unmap_single(dev, rsp_buffer_token, rsp_buffer_size,
                         DMA_FROM_DEVICE);
buf_rsp_map_failed:
        kfree(login_rsp_buffer);
buf_rsp_alloc_failed:
        dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE);
buf_map_failed:
        kfree(login_buffer);
buf_alloc_failed:
        return;
}

static void send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,
                             u32 len, u8 map_id)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.request_map.first = IBMVNIC_CRQ_CMD;
        crq.request_map.cmd = REQUEST_MAP;
        crq.request_map.map_id = map_id;
        crq.request_map.ioba = cpu_to_be32(addr);
        crq.request_map.len = cpu_to_be32(len);
        ibmvnic_send_crq(adapter, &crq);
}

static void send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.request_unmap.first = IBMVNIC_CRQ_CMD;
        crq.request_unmap.cmd = REQUEST_UNMAP;
        crq.request_unmap.map_id = map_id;
        ibmvnic_send_crq(adapter, &crq);
}

static void send_map_query(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;

        memset(&crq, 0, sizeof(crq));
        crq.query_map.first = IBMVNIC_CRQ_CMD;
        crq.query_map.cmd = QUERY_MAP;
        ibmvnic_send_crq(adapter, &crq);
}

/* Send a series of CRQs requesting various capabilities of the VNIC server */
static void send_cap_queries(struct ibmvnic_adapter *adapter)
{
        union ibmvnic_crq crq;

        atomic_set(&adapter->running_cap_crqs, 0);
        memset(&crq, 0, sizeof(crq));
        crq.query_capability.first = IBMVNIC_CRQ_CMD;
        crq.query_capability.cmd = QUERY_CAPABILITY;

        crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES);
        atomic_inc(&adapter->running_cap_crqs);

        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability =
            cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability =
            cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability =
            cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability =
            cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MIN_MTU);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MAX_MTU);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability =
                        cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability =
                        cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability =
                        cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);

        crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ);
        atomic_inc(&adapter->running_cap_crqs);
        ibmvnic_send_crq(adapter, &crq);
}

static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
        union ibmvnic_crq crq;
        int i;

        dma_unmap_single(dev, adapter->ip_offload_tok,
                         sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);

        netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
        for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
                netdev_dbg(adapter->netdev, "%016lx\n",
                           ((unsigned long int *)(buf))[i]);

        netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
        netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
        netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n",
                   buf->tcp_ipv4_chksum);
        netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n",
                   buf->tcp_ipv6_chksum);
        netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n",
                   buf->udp_ipv4_chksum);
        netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n",
                   buf->udp_ipv6_chksum);
        netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n",
                   buf->large_tx_ipv4);
        netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n",
                   buf->large_tx_ipv6);
        netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n",
                   buf->large_rx_ipv4);
        netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n",
                   buf->large_rx_ipv6);
        netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n",
                   buf->max_ipv4_header_size);
        netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n",
                   buf->max_ipv6_header_size);
        netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n",
                   buf->max_tcp_header_size);
        netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n",
                   buf->max_udp_header_size);
        netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n",
                   buf->max_large_tx_size);
        netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n",
                   buf->max_large_rx_size);
        netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n",
                   buf->ipv6_extension_header);
        netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n",
                   buf->tcp_pseudosum_req);
        netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n",
                   buf->num_ipv6_ext_headers);
        netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n",
                   buf->off_ipv6_ext_headers);

        adapter->ip_offload_ctrl_tok =
            dma_map_single(dev, &adapter->ip_offload_ctrl,
                           sizeof(adapter->ip_offload_ctrl), DMA_TO_DEVICE);

        if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) {
                dev_err(dev, "Couldn't map ip offload control buffer\n");
                return;
        }

        adapter->ip_offload_ctrl.version = cpu_to_be32(INITIAL_VERSION_IOB);
        adapter->ip_offload_ctrl.tcp_ipv4_chksum = buf->tcp_ipv4_chksum;
        adapter->ip_offload_ctrl.udp_ipv4_chksum = buf->udp_ipv4_chksum;
        adapter->ip_offload_ctrl.tcp_ipv6_chksum = buf->tcp_ipv6_chksum;
        adapter->ip_offload_ctrl.udp_ipv6_chksum = buf->udp_ipv6_chksum;

        /* large_tx/rx disabled for now, additional features needed */
        adapter->ip_offload_ctrl.large_tx_ipv4 = 0;
        adapter->ip_offload_ctrl.large_tx_ipv6 = 0;
        adapter->ip_offload_ctrl.large_rx_ipv4 = 0;
        adapter->ip_offload_ctrl.large_rx_ipv6 = 0;

        adapter->netdev->features = NETIF_F_GSO;

        if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum)
                adapter->netdev->features |= NETIF_F_IP_CSUM;

        if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum)
                adapter->netdev->features |= NETIF_F_IPV6_CSUM;

        if ((adapter->netdev->features &
            (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
                adapter->netdev->features |= NETIF_F_RXCSUM;

        memset(&crq, 0, sizeof(crq));
        crq.control_ip_offload.first = IBMVNIC_CRQ_CMD;
        crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD;
        crq.control_ip_offload.len =
            cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
        crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok);
        ibmvnic_send_crq(adapter, &crq);
}

static void handle_error_info_rsp(union ibmvnic_crq *crq,
                                  struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_error_buff *error_buff, *tmp;
        unsigned long flags;
        bool found = false;
        int i;

        if (!crq->request_error_rsp.rc.code) {
                dev_info(dev, "Request Error Rsp returned with rc=%x\n",
                         crq->request_error_rsp.rc.code);
                return;
        }

        spin_lock_irqsave(&adapter->error_list_lock, flags);
        list_for_each_entry_safe(error_buff, tmp, &adapter->errors, list)
                if (error_buff->error_id == crq->request_error_rsp.error_id) {
                        found = true;
                        list_del(&error_buff->list);
                        break;
                }
        spin_unlock_irqrestore(&adapter->error_list_lock, flags);

        if (!found) {
                dev_err(dev, "Couldn't find error id %x\n",
                        be32_to_cpu(crq->request_error_rsp.error_id));
                return;
        }

        dev_err(dev, "Detailed info for error id %x:",
                be32_to_cpu(crq->request_error_rsp.error_id));

        for (i = 0; i < error_buff->len; i++) {
                pr_cont("%02x", (int)error_buff->buff[i]);
                if (i % 8 == 7)
                        pr_cont(" ");
        }
        pr_cont("\n");

        dma_unmap_single(dev, error_buff->dma, error_buff->len,
                         DMA_FROM_DEVICE);
        kfree(error_buff->buff);
        kfree(error_buff);
}

static void handle_dump_size_rsp(union ibmvnic_crq *crq,
                                 struct ibmvnic_adapter *adapter)
{
        int len = be32_to_cpu(crq->request_dump_size_rsp.len);
        struct ibmvnic_inflight_cmd *inflight_cmd;
        struct device *dev = &adapter->vdev->dev;
        union ibmvnic_crq newcrq;
        unsigned long flags;

        /* allocate and map buffer */
        adapter->dump_data = kmalloc(len, GFP_KERNEL);
        if (!adapter->dump_data) {
                complete(&adapter->fw_done);
                return;
        }

        adapter->dump_data_token = dma_map_single(dev, adapter->dump_data, len,
                                                  DMA_FROM_DEVICE);

        if (dma_mapping_error(dev, adapter->dump_data_token)) {
                if (!firmware_has_feature(FW_FEATURE_CMO))
                        dev_err(dev, "Couldn't map dump data\n");
                kfree(adapter->dump_data);
                complete(&adapter->fw_done);
                return;
        }

        inflight_cmd = kmalloc(sizeof(*inflight_cmd), GFP_ATOMIC);
        if (!inflight_cmd) {
                dma_unmap_single(dev, adapter->dump_data_token, len,
                                 DMA_FROM_DEVICE);
                kfree(adapter->dump_data);
                complete(&adapter->fw_done);
                return;
        }

        memset(&newcrq, 0, sizeof(newcrq));
        newcrq.request_dump.first = IBMVNIC_CRQ_CMD;
        newcrq.request_dump.cmd = REQUEST_DUMP;
        newcrq.request_dump.ioba = cpu_to_be32(adapter->dump_data_token);
        newcrq.request_dump.len = cpu_to_be32(adapter->dump_data_size);

        memcpy(&inflight_cmd->crq, &newcrq, sizeof(newcrq));

        spin_lock_irqsave(&adapter->inflight_lock, flags);
        list_add_tail(&inflight_cmd->list, &adapter->inflight);
        spin_unlock_irqrestore(&adapter->inflight_lock, flags);

        ibmvnic_send_crq(adapter, &newcrq);
}

static void handle_error_indication(union ibmvnic_crq *crq,
                                    struct ibmvnic_adapter *adapter)
{
        int detail_len = be32_to_cpu(crq->error_indication.detail_error_sz);
        struct ibmvnic_inflight_cmd *inflight_cmd;
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_error_buff *error_buff;
        union ibmvnic_crq new_crq;
        unsigned long flags;

        dev_err(dev, "Firmware reports %serror id %x, cause %d\n",
                crq->error_indication.
                    flags & IBMVNIC_FATAL_ERROR ? "FATAL " : "",
                be32_to_cpu(crq->error_indication.error_id),
                be16_to_cpu(crq->error_indication.error_cause));

        error_buff = kmalloc(sizeof(*error_buff), GFP_ATOMIC);
        if (!error_buff)
                return;

        error_buff->buff = kmalloc(detail_len, GFP_ATOMIC);
        if (!error_buff->buff) {
                kfree(error_buff);
                return;
        }

        error_buff->dma = dma_map_single(dev, error_buff->buff, detail_len,
                                         DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, error_buff->dma)) {
                if (!firmware_has_feature(FW_FEATURE_CMO))
                        dev_err(dev, "Couldn't map error buffer\n");
                kfree(error_buff->buff);
                kfree(error_buff);
                return;
        }

        inflight_cmd = kmalloc(sizeof(*inflight_cmd), GFP_ATOMIC);
        if (!inflight_cmd) {
                dma_unmap_single(dev, error_buff->dma, detail_len,
                                 DMA_FROM_DEVICE);
                kfree(error_buff->buff);
                kfree(error_buff);
                return;
        }

        error_buff->len = detail_len;
        error_buff->error_id = crq->error_indication.error_id;

        spin_lock_irqsave(&adapter->error_list_lock, flags);
        list_add_tail(&error_buff->list, &adapter->errors);
        spin_unlock_irqrestore(&adapter->error_list_lock, flags);

        memset(&new_crq, 0, sizeof(new_crq));
        new_crq.request_error_info.first = IBMVNIC_CRQ_CMD;
        new_crq.request_error_info.cmd = REQUEST_ERROR_INFO;
        new_crq.request_error_info.ioba = cpu_to_be32(error_buff->dma);
        new_crq.request_error_info.len = cpu_to_be32(detail_len);
        new_crq.request_error_info.error_id = crq->error_indication.error_id;

        memcpy(&inflight_cmd->crq, &crq, sizeof(crq));

        spin_lock_irqsave(&adapter->inflight_lock, flags);
        list_add_tail(&inflight_cmd->list, &adapter->inflight);
        spin_unlock_irqrestore(&adapter->inflight_lock, flags);

        ibmvnic_send_crq(adapter, &new_crq);
}

static void handle_change_mac_rsp(union ibmvnic_crq *crq,
                                  struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        long rc;

        rc = crq->change_mac_addr_rsp.rc.code;
        if (rc) {
                dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc);
                return;
        }
        memcpy(netdev->dev_addr, &crq->change_mac_addr_rsp.mac_addr[0],
               ETH_ALEN);
}

static void handle_request_cap_rsp(union ibmvnic_crq *crq,
                                   struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        u64 *req_value;
        char *name;

        atomic_dec(&adapter->running_cap_crqs);
        switch (be16_to_cpu(crq->request_capability_rsp.capability)) {
        case REQ_TX_QUEUES:
                req_value = &adapter->req_tx_queues;
                name = "tx";
                break;
        case REQ_RX_QUEUES:
                req_value = &adapter->req_rx_queues;
                name = "rx";
                break;
        case REQ_RX_ADD_QUEUES:
                req_value = &adapter->req_rx_add_queues;
                name = "rx_add";
                break;
        case REQ_TX_ENTRIES_PER_SUBCRQ:
                req_value = &adapter->req_tx_entries_per_subcrq;
                name = "tx_entries_per_subcrq";
                break;
        case REQ_RX_ADD_ENTRIES_PER_SUBCRQ:
                req_value = &adapter->req_rx_add_entries_per_subcrq;
                name = "rx_add_entries_per_subcrq";
                break;
        case REQ_MTU:
                req_value = &adapter->req_mtu;
                name = "mtu";
                break;
        case PROMISC_REQUESTED:
                req_value = &adapter->promisc;
                name = "promisc";
                break;
        default:
                dev_err(dev, "Got invalid cap request rsp %d\n",
                        crq->request_capability.capability);
                return;
        }

        switch (crq->request_capability_rsp.rc.code) {
        case SUCCESS:
                break;
        case PARTIALSUCCESS:
                dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
                         *req_value,
                         (long int)be64_to_cpu(crq->request_capability_rsp.
                                               number), name);
                release_sub_crqs_no_irqs(adapter);
                *req_value = be64_to_cpu(crq->request_capability_rsp.number);
                init_sub_crqs(adapter, 1);
                return;
        default:
                dev_err(dev, "Error %d in request cap rsp\n",
                        crq->request_capability_rsp.rc.code);
                return;
        }

        /* Done receiving requested capabilities, query IP offload support */
        if (atomic_read(&adapter->running_cap_crqs) == 0) {
                union ibmvnic_crq newcrq;
                int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer);
                struct ibmvnic_query_ip_offload_buffer *ip_offload_buf =
                    &adapter->ip_offload_buf;

                adapter->wait_capability = false;
                adapter->ip_offload_tok = dma_map_single(dev, ip_offload_buf,
                                                         buf_sz,
                                                         DMA_FROM_DEVICE);

                if (dma_mapping_error(dev, adapter->ip_offload_tok)) {
                        if (!firmware_has_feature(FW_FEATURE_CMO))
                                dev_err(dev, "Couldn't map offload buffer\n");
                        return;
                }

                memset(&newcrq, 0, sizeof(newcrq));
                newcrq.query_ip_offload.first = IBMVNIC_CRQ_CMD;
                newcrq.query_ip_offload.cmd = QUERY_IP_OFFLOAD;
                newcrq.query_ip_offload.len = cpu_to_be32(buf_sz);
                newcrq.query_ip_offload.ioba =
                    cpu_to_be32(adapter->ip_offload_tok);

                ibmvnic_send_crq(adapter, &newcrq);
        }
}

static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
                            struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
        struct ibmvnic_login_buffer *login = adapter->login_buf;
        union ibmvnic_crq crq;
        int i;

        dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz,
                         DMA_BIDIRECTIONAL);
        dma_unmap_single(dev, adapter->login_rsp_buf_token,
                         adapter->login_rsp_buf_sz, DMA_BIDIRECTIONAL);

        /* If the number of queues requested can't be allocated by the
         * server, the login response will return with code 1. We will need
         * to resend the login buffer with fewer queues requested.
         */
        if (login_rsp_crq->generic.rc.code) {
                adapter->renegotiate = true;
                complete(&adapter->init_done);
                return 0;
        }

        netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
        for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
                netdev_dbg(adapter->netdev, "%016lx\n",
                           ((unsigned long int *)(adapter->login_rsp_buf))[i]);
        }

        /* Sanity checks */
        if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs ||
            (be32_to_cpu(login->num_rxcomp_subcrqs) *
             adapter->req_rx_add_queues !=
             be32_to_cpu(login_rsp->num_rxadd_subcrqs))) {
                dev_err(dev, "FATAL: Inconsistent login and login rsp\n");
                ibmvnic_remove(adapter->vdev);
                return -EIO;
        }
        complete(&adapter->init_done);

        memset(&crq, 0, sizeof(crq));
        crq.request_ras_comp_num.first = IBMVNIC_CRQ_CMD;
        crq.request_ras_comp_num.cmd = REQUEST_RAS_COMP_NUM;
        ibmvnic_send_crq(adapter, &crq);

        return 0;
}

static void handle_request_map_rsp(union ibmvnic_crq *crq,
                                   struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        u8 map_id = crq->request_map_rsp.map_id;
        int tx_subcrqs;
        int rx_subcrqs;
        long rc;
        int i;

        tx_subcrqs = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
        rx_subcrqs = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);

        rc = crq->request_map_rsp.rc.code;
        if (rc) {
                dev_err(dev, "Error %ld in REQUEST_MAP_RSP\n", rc);
                adapter->map_id--;
                /* need to find and zero tx/rx_pool map_id */
                for (i = 0; i < tx_subcrqs; i++) {
                        if (adapter->tx_pool[i].long_term_buff.map_id == map_id)
                                adapter->tx_pool[i].long_term_buff.map_id = 0;
                }
                for (i = 0; i < rx_subcrqs; i++) {
                        if (adapter->rx_pool[i].long_term_buff.map_id == map_id)
                                adapter->rx_pool[i].long_term_buff.map_id = 0;
                }
        }
        complete(&adapter->fw_done);
}

static void handle_request_unmap_rsp(union ibmvnic_crq *crq,
                                     struct ibmvnic_adapter *adapter)
{
        struct device *dev = &adapter->vdev->dev;
        long rc;

        rc = crq->request_unmap_rsp.rc.code;
        if (rc)
                dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc);
}

static void handle_query_map_rsp(union ibmvnic_crq *crq,
                                 struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        long rc;

        rc = crq->query_map_rsp.rc.code;
        if (rc) {
                dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
                return;
        }
        netdev_dbg(netdev, "page_size = %d\ntot_pages = %d\nfree_pages = %d\n",
                   crq->query_map_rsp.page_size, crq->query_map_rsp.tot_pages,
                   crq->query_map_rsp.free_pages);
}

static void handle_query_cap_rsp(union ibmvnic_crq *crq,
                                 struct ibmvnic_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct device *dev = &adapter->vdev->dev;
        long rc;

        atomic_dec(&adapter->running_cap_crqs);
        netdev_dbg(netdev, "Outstanding queries: %d\n",
                   atomic_read(&adapter->running_cap_crqs));
        rc = crq->query_capability.rc.code;
        if (rc) {
                dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc);
                goto out;
        }

        switch (be16_to_cpu(crq->query_capability.capability)) {
        case MIN_TX_QUEUES:
                adapter->min_tx_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_tx_queues = %lld\n",
                           adapter->min_tx_queues);
                break;
        case MIN_RX_QUEUES:
                adapter->min_rx_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_rx_queues = %lld\n",
                           adapter->min_rx_queues);
                break;
        case MIN_RX_ADD_QUEUES:
                adapter->min_rx_add_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_rx_add_queues = %lld\n",
                           adapter->min_rx_add_queues);
                break;
        case MAX_TX_QUEUES:
                adapter->max_tx_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_tx_queues = %lld\n",
                           adapter->max_tx_queues);
                break;
        case MAX_RX_QUEUES:
                adapter->max_rx_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_rx_queues = %lld\n",
                           adapter->max_rx_queues);
                break;
        case MAX_RX_ADD_QUEUES:
                adapter->max_rx_add_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_rx_add_queues = %lld\n",
                           adapter->max_rx_add_queues);
                break;
        case MIN_TX_ENTRIES_PER_SUBCRQ:
                adapter->min_tx_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n",
                           adapter->min_tx_entries_per_subcrq);
                break;
        case MIN_RX_ADD_ENTRIES_PER_SUBCRQ:
                adapter->min_rx_add_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n",
                           adapter->min_rx_add_entries_per_subcrq);
                break;
        case MAX_TX_ENTRIES_PER_SUBCRQ:
                adapter->max_tx_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n",
                           adapter->max_tx_entries_per_subcrq);
                break;
        case MAX_RX_ADD_ENTRIES_PER_SUBCRQ:
                adapter->max_rx_add_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n",
                           adapter->max_rx_add_entries_per_subcrq);
                break;
        case TCP_IP_OFFLOAD:
                adapter->tcp_ip_offload =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "tcp_ip_offload = %lld\n",
                           adapter->tcp_ip_offload);
                break;
        case PROMISC_SUPPORTED:
                adapter->promisc_supported =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "promisc_supported = %lld\n",
                           adapter->promisc_supported);
                break;
        case MIN_MTU:
                adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
                netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
                netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
                break;
        case MAX_MTU:
                adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
                netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
                netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
                break;
        case MAX_MULTICAST_FILTERS:
                adapter->max_multicast_filters =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_multicast_filters = %lld\n",
                           adapter->max_multicast_filters);
                break;
        case VLAN_HEADER_INSERTION:
                adapter->vlan_header_insertion =
                    be64_to_cpu(crq->query_capability.number);
                if (adapter->vlan_header_insertion)
                        netdev->features |= NETIF_F_HW_VLAN_STAG_TX;
                netdev_dbg(netdev, "vlan_header_insertion = %lld\n",
                           adapter->vlan_header_insertion);
                break;
        case MAX_TX_SG_ENTRIES:
                adapter->max_tx_sg_entries =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "max_tx_sg_entries = %lld\n",
                           adapter->max_tx_sg_entries);
                break;
        case RX_SG_SUPPORTED:
                adapter->rx_sg_supported =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "rx_sg_supported = %lld\n",
                           adapter->rx_sg_supported);
                break;
        case OPT_TX_COMP_SUB_QUEUES:
                adapter->opt_tx_comp_sub_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n",
                           adapter->opt_tx_comp_sub_queues);
                break;
        case OPT_RX_COMP_QUEUES:
                adapter->opt_rx_comp_queues =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n",
                           adapter->opt_rx_comp_queues);
                break;
        case OPT_RX_BUFADD_Q_PER_RX_COMP_Q:
                adapter->opt_rx_bufadd_q_per_rx_comp_q =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n",
                           adapter->opt_rx_bufadd_q_per_rx_comp_q);
                break;
        case OPT_TX_ENTRIES_PER_SUBCRQ:
                adapter->opt_tx_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n",
                           adapter->opt_tx_entries_per_subcrq);
                break;
        case OPT_RXBA_ENTRIES_PER_SUBCRQ:
                adapter->opt_rxba_entries_per_subcrq =
                    be64_to_cpu(crq->query_capability.number);
                netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n",
                           adapter->opt_rxba_entries_per_subcrq);
                break;
        case TX_RX_DESC_REQ:
                adapter->tx_rx_desc_req = crq->query_capability.number;
                netdev_dbg(netdev, "tx_rx_desc_req = %llx\n",
                           adapter->tx_rx_desc_req);
                break;

        default:
                netdev_err(netdev, "Got invalid cap rsp %d\n",
                           crq->query_capability.capability);
        }

out:
        if (atomic_read(&adapter->running_cap_crqs) == 0) {
                adapter->wait_capability = false;
                init_sub_crqs(adapter, 0);
                /* We're done querying the capabilities, initialize sub-crqs */
        }
}

static void handle_control_ras_rsp(union ibmvnic_crq *crq,
                                   struct ibmvnic_adapter *adapter)
{
        u8 correlator = crq->control_ras_rsp.correlator;
        struct device *dev = &adapter->vdev->dev;
        bool found = false;
        int i;

        if (crq->control_ras_rsp.rc.code) {
                dev_warn(dev, "Control ras failed rc=%d\n",
                         crq->control_ras_rsp.rc.code);
                return;
        }

        for (i = 0; i < adapter->ras_comp_num; i++) {
                if (adapter->ras_comps[i].correlator == correlator) {
                        found = true;
                        break;
                }
        }

        if (!found) {
                dev_warn(dev, "Correlator not found on control_ras_rsp\n");
                return;
        }

        switch (crq->control_ras_rsp.op) {
        case IBMVNIC_TRACE_LEVEL:
                adapter->ras_comps[i].trace_level = crq->control_ras.level;
                break;
        case IBMVNIC_ERROR_LEVEL:
                adapter->ras_comps[i].error_check_level =
                    crq->control_ras.level;
                break;
        case IBMVNIC_TRACE_PAUSE:
                adapter->ras_comp_int[i].paused = 1;
                break;
        case IBMVNIC_TRACE_RESUME:
                adapter->ras_comp_int[i].paused = 0;
                break;
        case IBMVNIC_TRACE_ON:
                adapter->ras_comps[i].trace_on = 1;
                break;
        case IBMVNIC_TRACE_OFF:
                adapter->ras_comps[i].trace_on = 0;
                break;
        case IBMVNIC_CHG_TRACE_BUFF_SZ:
                /* trace_buff_sz is 3 bytes, stuff it into an int */
                ((u8 *)(&adapter->ras_comps[i].trace_buff_size))[0] = 0;
                ((u8 *)(&adapter->ras_comps[i].trace_buff_size))[1] =
                    crq->control_ras_rsp.trace_buff_sz[0];
                ((u8 *)(&adapter->ras_comps[i].trace_buff_size))[2] =
                    crq->control_ras_rsp.trace_buff_sz[1];
                ((u8 *)(&adapter->ras_comps[i].trace_buff_size))[3] =
                    crq->control_ras_rsp.trace_buff_sz[2];
                break;
        default:
                dev_err(dev, "invalid op %d on control_ras_rsp",
                        crq->control_ras_rsp.op);
        }
}

static ssize_t trace_read(struct file *file, char __user *user_buf, size_t len,
                          loff_t *ppos)
{
        struct ibmvnic_fw_comp_internal *ras_comp_int = file->private_data;
        struct ibmvnic_adapter *adapter = ras_comp_int->adapter;
        struct device *dev = &adapter->vdev->dev;
        struct ibmvnic_fw_trace_entry *trace;
        int num = ras_comp_int->num;
        union ibmvnic_crq crq;
        dma_addr_t trace_tok;

        if (*ppos >= be32_to_cpu(adapter->ras_comps[num].trace_buff_size))
                return 0;

        trace =
            dma_alloc_coherent(dev,
                               be32_to_cpu(adapter->ras_comps[num].
                                           trace_buff_size), &trace_tok,
                               GFP_KERNEL);
        if (!trace) {
                dev_err(dev, "Couldn't alloc trace buffer\n");
                return 0;
        }

        memset(&crq, 0, sizeof(crq));
        crq.collect_fw_trace.first = IBMVNIC_CRQ_CMD;
        crq.collect_fw_trace.cmd = COLLECT_FW_TRACE;
        crq.collect_fw_trace.correlator = adapter->ras_comps[num].correlator;
        crq.collect_fw_trace.ioba = cpu_to_be32(trace_tok);
        crq.collect_fw_trace.len = adapter->ras_comps[num].trace_buff_size;

        init_completion(&adapter->fw_done);
        ibmvnic_send_crq(adapter, &crq);
        wait_for_completion(&adapter->fw_done);

        if (*ppos + len > be32_to_cpu(adapter->ras_comps[num].trace_buff_size))
                len =
                    be32_to_cpu(adapter->ras_comps[num].trace_buff_size) -
                    *ppos;

        copy_to_user(user_buf, &((u8 *)trace)[*ppos], len);

        dma_free_coherent(dev,
                          be32_to_cpu(adapter->ras_comps[num].trace_buff_size),
                          trace, trace_tok);
        *ppos += len;
        return len;
}

static const struct file_operations trace_ops = {
        .owner          = THIS_MODULE,
        .open           = simple_open,
        .read           = trace_read,
};

static ssize_t paused_read(struct file *file, char __user *user_buf, size_t len,
                           loff_t *ppos)
{
        struct ibmvnic_fw_comp_internal *ras_comp_int = file->private_data;
        struct ibmvnic_adapter *adapter = ras_comp_int->adapter;
        int num = ras_comp_int->num;
        char buff[5]; /*  1 or 0 plus \n and \0 */
        int size;

        size = sprintf(buff, "%d\n", adapter->ras_comp_int[num].paused);

        if (*ppos >= size)
                return 0;

        copy_to_user(user_buf, buff, size);
        *ppos += size;
        return size;
}

static ssize_t paused_write(struct file *file, const char __user *user_buf,
                            size_t len, loff_t *ppos)
{
        struct ibmvnic_fw_comp_internal *ras_comp_int = file->private_data;
        struct ibmvnic_adapter *adapter = ras_comp_int->adapter;
        int num = ras_comp_int->num;
        union ibmvnic_crq crq;
        unsigned long val;
        char buff[9]; /* decimal max int plus \n and \0 */

        copy_from_user(buff, user_buf, sizeof(buff));
        val = kstrtoul(buff, 10, NULL);

        adapter->ras_comp_int[num].paused = val ? 1 : 0;

        memset(&crq, 0, sizeof(crq));
        crq.control_ras.first = IBMVNIC_CRQ_CMD;
        crq.control_ras.cmd = CONTROL_RAS;
        crq.control_ras.correlator = adapter->ras_comps[num].correlator;
        crq.control_ras.op = val ? IBMVNIC_TRACE_PAUSE : IBMVNIC_TRACE_RESUME;
        ibmvnic_send_crq(adapter, &crq);

        return len;
}

static const struct file_operations paused_ops = {
        .owner          = THIS_MODULE,
        .open           = simple_open,
        .read           = paused_read,
        .write          = paused_write,
};

static ssize_t tracing_read(struct file *file, char __user *user_buf,
                            size_t len, loff_t *ppos)
{
        struct ibmvnic_fw_comp_internal *ras_comp_int = file->private_data;
        struct ibmvnic_adapter *adapter = ras_comp_int->adapter;
        int num = ras_comp_int->num;
        char buff[5]; /*  1 or 0 plus \n and \0 */
        int size;

        size = sprintf(buff, "%d\n", adapter->ras_comps[num].trace_on);

        if (*ppos >= size)
                return 0;

        copy_to_user(user_buf, buff, size);
        *ppos += size;
        return size;
}

static ssize_t tracing_write(struct file *file, const char __user *user_buf,
                             size_t len, loff_t *ppos)
{
        struct ibmvnic_fw_comp_internal *ras_comp_int = file->private_data;
        struct ibmvnic_adapter *adapter = ras_comp_int->adapter;
        int num = ras_comp_int->num;
        union ibmvnic_crq crq;
        unsigned long val;
        char buff[9]; /* decimal max int plus \n and \0 */

        copy_from_user(buff, user_buf, sizeof(buff));
        val = kstrtoul(buff, 10, NULL);

        memset(&crq, 0, sizeof(crq));
        crq.control_ras.first = IBMVNIC_CRQ_CMD;
        crq.control_ras.cmd = CONTROL_RAS;
        crq.control_ras.correlator = adapter->ras_comps[num].correlator;
        crq.control_ras.op = val ? IBMVNIC_TRACE_ON : IBMVNIC_TRACE_OFF;

        return len;
}

static const struct file_operations tracing_ops = {
        .owner          = THIS_MODULE,
        .open           = simple_open,
        .read           = tracing_read,
        .write          = tracing_write,
};

static ssize_t error_level_read(struct file *file, char __user *user_buf,
                                size_t len, loff_t *ppos)
{
        struct ibmvnic_fw_comp_internal *ras_comp_int = file->private_data;
        struct ibmvnic_adapter *adapter = ras_comp_int->adapter;
        int num = ras_comp_int->num;
        char buff[5]; /* decimal max char plus \n and \0 */
        int size;

        size = sprintf(buff, "%d\n", adapter->ras_comps[num].error_check_level);

        if (*ppos >= size)
                return 0;

        copy_to_user(user_buf, buff, size);
        *ppos += size;
        return size;
}

static ssize_t error_level_write(struct file *file, const char __user *user_buf,
                                 size_t len, loff_t *ppos)
{
        struct ibmvnic_fw_comp_internal *ras_comp_int = file->private_data;
        struct ibmvnic_adapter *adapter = ras_comp_int->adapter;
        int num = ras_comp_int->num;
        union ibmvnic_crq crq;
        unsigned long val;
        char buff[9]; /* decimal max int plus \n and \0 */

        copy_from_user(buff, user_buf, sizeof(buff));
        val = kstrtoul(buff, 10, NULL);

        if (val > 9)
                val = 9;