/*******************************************************************************
*
* Copyright (c) 2015-2016 Intel Corporation.  All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses.  You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenFabrics.org BSD license below:
*
*   Redistribution and use in source and binary forms, with or
*   without modification, are permitted provided that the following
*   conditions are met:
*
*    - Redistributions of source code must retain the above
*       copyright notice, this list of conditions and the following
*       disclaimer.
*
*    - Redistributions in binary form must reproduce the above
*       copyright notice, this list of conditions and the following
*       disclaimer in the documentation and/or other materials
*       provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*******************************************************************************/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/init.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/byteorder.h>
#include <net/netevent.h>
#include <net/neighbour.h>
#include "i40iw.h"

/**
 * i40iw_arp_table - manage arp table
 * @iwdev: iwarp device
 * @ip_addr: ip address for device
 * @mac_addr: mac address ptr
 * @action: modify, delete or add
 */
int i40iw_arp_table(struct i40iw_device *iwdev,
                    u32 *ip_addr,
                    bool ipv4,
                    u8 *mac_addr,
                    u32 action)
{
        int arp_index;
        int err;
        u32 ip[4];

        if (ipv4) {
                memset(ip, 0, sizeof(ip));
                ip[0] = *ip_addr;
        } else {
                memcpy(ip, ip_addr, sizeof(ip));
        }

        for (arp_index = 0; (u32)arp_index < iwdev->arp_table_size; arp_index++)
                if (memcmp(iwdev->arp_table[arp_index].ip_addr, ip, sizeof(ip)) == 0)
                        break;
        switch (action) {
        case I40IW_ARP_ADD:
                if (arp_index != iwdev->arp_table_size)
                        return -1;

                arp_index = 0;
                err = i40iw_alloc_resource(iwdev, iwdev->allocated_arps,
                                           iwdev->arp_table_size,
                                           (u32 *)&arp_index,
                                           &iwdev->next_arp_index);

                if (err)
                        return err;

                memcpy(iwdev->arp_table[arp_index].ip_addr, ip, sizeof(ip));
                ether_addr_copy(iwdev->arp_table[arp_index].mac_addr, mac_addr);
                break;
        case I40IW_ARP_RESOLVE:
                if (arp_index == iwdev->arp_table_size)
                        return -1;
                break;
        case I40IW_ARP_DELETE:
                if (arp_index == iwdev->arp_table_size)
                        return -1;
                memset(iwdev->arp_table[arp_index].ip_addr, 0,
                       sizeof(iwdev->arp_table[arp_index].ip_addr));
                eth_zero_addr(iwdev->arp_table[arp_index].mac_addr);
                i40iw_free_resource(iwdev, iwdev->allocated_arps, arp_index);
                break;
        default:
                return -1;
        }
        return arp_index;
}

/**
 * i40iw_wr32 - write 32 bits to hw register
 * @hw: hardware information including registers
 * @reg: register offset
 * @value: vvalue to write to register
 */
inline void i40iw_wr32(struct i40iw_hw *hw, u32 reg, u32 value)
{
        writel(value, hw->hw_addr + reg);
}

/**
 * i40iw_rd32 - read a 32 bit hw register
 * @hw: hardware information including registers
 * @reg: register offset
 *
 * Return value of register content
 */
inline u32 i40iw_rd32(struct i40iw_hw *hw, u32 reg)
{
        return readl(hw->hw_addr + reg);
}

/**
 * i40iw_inetaddr_event - system notifier for ipv4 addr events
 * @notfier: not used
 * @event: event for notifier
 * @ptr: if address
 */
int i40iw_inetaddr_event(struct notifier_block *notifier,
                         unsigned long event,
                         void *ptr)
{
        struct in_ifaddr *ifa = ptr;
        struct net_device *event_netdev = ifa->ifa_dev->dev;
        struct net_device *netdev;
        struct net_device *upper_dev;
        struct i40iw_device *iwdev;
        struct i40iw_handler *hdl;
        u32 local_ipaddr;
        u32 action = I40IW_ARP_ADD;

        hdl = i40iw_find_netdev(event_netdev);
        if (!hdl)
                return NOTIFY_DONE;

        iwdev = &hdl->device;
        if (iwdev->init_state < IP_ADDR_REGISTERED || iwdev->closing)
                return NOTIFY_DONE;

        netdev = iwdev->ldev->netdev;
        upper_dev = netdev_master_upper_dev_get(netdev);
        if (netdev != event_netdev)
                return NOTIFY_DONE;

        if (upper_dev) {
                struct in_device *in;

                rcu_read_lock();
                in = __in_dev_get_rcu(upper_dev);

                local_ipaddr = 0;
                if (in) {
                        struct in_ifaddr *ifa;

                        ifa = rcu_dereference(in->ifa_list);
                        if (ifa)
                                local_ipaddr = ntohl(ifa->ifa_address);
                }

                rcu_read_unlock();
        } else {
                local_ipaddr = ntohl(ifa->ifa_address);
        }
        switch (event) {
        case NETDEV_DOWN:
                action = I40IW_ARP_DELETE;
                /* Fall through */
        case NETDEV_UP:
                /* Fall through */
        case NETDEV_CHANGEADDR:

                /* Just skip if no need to handle ARP cache */
                if (!local_ipaddr)
                        break;

                i40iw_manage_arp_cache(iwdev,
                                       netdev->dev_addr,
                                       &local_ipaddr,
                                       true,
                                       action);
                i40iw_if_notify(iwdev, netdev, &local_ipaddr, true,
                                (action == I40IW_ARP_ADD) ? true : false);
                break;
        default:
                break;
        }
        return NOTIFY_DONE;
}

/**
 * i40iw_inet6addr_event - system notifier for ipv6 addr events
 * @notfier: not used
 * @event: event for notifier
 * @ptr: if address
 */
int i40iw_inet6addr_event(struct notifier_block *notifier,
                          unsigned long event,
                          void *ptr)
{
        struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
        struct net_device *event_netdev = ifa->idev->dev;
        struct net_device *netdev;
        struct i40iw_device *iwdev;
        struct i40iw_handler *hdl;
        u32 local_ipaddr6[4];
        u32 action = I40IW_ARP_ADD;

        hdl = i40iw_find_netdev(event_netdev);
        if (!hdl)
                return NOTIFY_DONE;

        iwdev = &hdl->device;
        if (iwdev->init_state < IP_ADDR_REGISTERED || iwdev->closing)
                return NOTIFY_DONE;

        netdev = iwdev->ldev->netdev;
        if (netdev != event_netdev)
                return NOTIFY_DONE;

        i40iw_copy_ip_ntohl(local_ipaddr6, ifa->addr.in6_u.u6_addr32);
        switch (event) {
        case NETDEV_DOWN:
                action = I40IW_ARP_DELETE;
                /* Fall through */
        case NETDEV_UP:
                /* Fall through */
        case NETDEV_CHANGEADDR:
                i40iw_manage_arp_cache(iwdev,
                                       netdev->dev_addr,
                                       local_ipaddr6,
                                       false,
                                       action);
                i40iw_if_notify(iwdev, netdev, local_ipaddr6, false,
                                (action == I40IW_ARP_ADD) ? true : false);
                break;
        default:
                break;
        }
        return NOTIFY_DONE;
}

/**
 * i40iw_net_event - system notifier for netevents
 * @notfier: not used
 * @event: event for notifier
 * @ptr: neighbor
 */
int i40iw_net_event(struct notifier_block *notifier, unsigned long event, void *ptr)
{
        struct neighbour *neigh = ptr;
        struct i40iw_device *iwdev;
        struct i40iw_handler *iwhdl;
        __be32 *p;
        u32 local_ipaddr[4];

        switch (event) {
        case NETEVENT_NEIGH_UPDATE:
                iwhdl = i40iw_find_netdev((struct net_device *)neigh->dev);
                if (!iwhdl)
                        return NOTIFY_DONE;
                iwdev = &iwhdl->device;
                if (iwdev->init_state < IP_ADDR_REGISTERED || iwdev->closing)
                        return NOTIFY_DONE;
                p = (__be32 *)neigh->primary_key;
                i40iw_copy_ip_ntohl(local_ipaddr, p);
                if (neigh->nud_state & NUD_VALID) {
                        i40iw_manage_arp_cache(iwdev,
                                               neigh->ha,
                                               local_ipaddr,
                                               false,
                                               I40IW_ARP_ADD);

                } else {
                        i40iw_manage_arp_cache(iwdev,
                                               neigh->ha,
                                               local_ipaddr,
                                               false,
                                               I40IW_ARP_DELETE);
                }
                break;
        default:
                break;
        }
        return NOTIFY_DONE;
}

/**
 * i40iw_netdevice_event - system notifier for netdev events
 * @notfier: not used
 * @event: event for notifier
 * @ptr: netdev
 */
int i40iw_netdevice_event(struct notifier_block *notifier,
                          unsigned long event,
                          void *ptr)
{
        struct net_device *event_netdev;
        struct net_device *netdev;
        struct i40iw_device *iwdev;
        struct i40iw_handler *hdl;

        event_netdev = netdev_notifier_info_to_dev(ptr);

        hdl = i40iw_find_netdev(event_netdev);
        if (!hdl)
                return NOTIFY_DONE;

        iwdev = &hdl->device;
        if (iwdev->init_state < RDMA_DEV_REGISTERED || iwdev->closing)
                return NOTIFY_DONE;

        netdev = iwdev->ldev->netdev;
        if (netdev != event_netdev)
                return NOTIFY_DONE;

        iwdev->iw_status = 1;

        switch (event) {
        case NETDEV_DOWN:
                iwdev->iw_status = 0;
                /* Fall through */
        case NETDEV_UP:
                i40iw_port_ibevent(iwdev);
                break;
        default:
                break;
        }
        return NOTIFY_DONE;
}

/**
 * i40iw_get_cqp_request - get cqp struct
 * @cqp: device cqp ptr
 * @wait: cqp to be used in wait mode
 */
struct i40iw_cqp_request *i40iw_get_cqp_request(struct i40iw_cqp *cqp, bool wait)
{
        struct i40iw_cqp_request *cqp_request = NULL;
        unsigned long flags;

        spin_lock_irqsave(&cqp->req_lock, flags);
        if (!list_empty(&cqp->cqp_avail_reqs)) {
                cqp_request = list_entry(cqp->cqp_avail_reqs.next,
                                         struct i40iw_cqp_request, list);
                list_del_init(&cqp_request->list);
        }
        spin_unlock_irqrestore(&cqp->req_lock, flags);
        if (!cqp_request) {
                cqp_request = kzalloc(sizeof(*cqp_request), GFP_ATOMIC);
                if (cqp_request) {
                        cqp_request->dynamic = true;
                        INIT_LIST_HEAD(&cqp_request->list);
                        init_waitqueue_head(&cqp_request->waitq);
                }
        }
        if (!cqp_request) {
                i40iw_pr_err("CQP Request Fail: No Memory");
                return NULL;
        }

        if (wait) {
                atomic_set(&cqp_request->refcount, 2);
                cqp_request->waiting = true;
        } else {
                atomic_set(&cqp_request->refcount, 1);
        }
        return cqp_request;
}

/**
 * i40iw_free_cqp_request - free cqp request
 * @cqp: cqp ptr
 * @cqp_request: to be put back in cqp list
 */
void i40iw_free_cqp_request(struct i40iw_cqp *cqp, struct i40iw_cqp_request *cqp_request)
{
        struct i40iw_device *iwdev = container_of(cqp, struct i40iw_device, cqp);
        unsigned long flags;

        if (cqp_request->dynamic) {
                kfree(cqp_request);
        } else {
                cqp_request->request_done = false;
                cqp_request->callback_fcn = NULL;
                cqp_request->waiting = false;

                spin_lock_irqsave(&cqp->req_lock, flags);
                list_add_tail(&cqp_request->list, &cqp->cqp_avail_reqs);
                spin_unlock_irqrestore(&cqp->req_lock, flags);
        }
        wake_up(&iwdev->close_wq);
}

/**
 * i40iw_put_cqp_request - dec ref count and free if 0
 * @cqp: cqp ptr
 * @cqp_request: to be put back in cqp list
 */
void i40iw_put_cqp_request(struct i40iw_cqp *cqp,
                           struct i40iw_cqp_request *cqp_request)
{
        if (atomic_dec_and_test(&cqp_request->refcount))
                i40iw_free_cqp_request(cqp, cqp_request);
}

/**
 * i40iw_free_pending_cqp_request -free pending cqp request objs
 * @cqp: cqp ptr
 * @cqp_request: to be put back in cqp list
 */
static void i40iw_free_pending_cqp_request(struct i40iw_cqp *cqp,
                                           struct i40iw_cqp_request *cqp_request)
{
        struct i40iw_device *iwdev = container_of(cqp, struct i40iw_device, cqp);

        if (cqp_request->waiting) {
                cqp_request->compl_info.error = true;
                cqp_request->request_done = true;
                wake_up(&cqp_request->waitq);
        }
        i40iw_put_cqp_request(cqp, cqp_request);
        wait_event_timeout(iwdev->close_wq,
                           !atomic_read(&cqp_request->refcount),
                           1000);
}

/**
 * i40iw_cleanup_pending_cqp_op - clean-up cqp with no completions
 * @iwdev: iwarp device
 */
void i40iw_cleanup_pending_cqp_op(struct i40iw_device *iwdev)
{
        struct i40iw_sc_dev *dev = &iwdev->sc_dev;
        struct i40iw_cqp *cqp = &iwdev->cqp;
        struct i40iw_cqp_request *cqp_request = NULL;
        struct cqp_commands_info *pcmdinfo = NULL;
        u32 i, pending_work, wqe_idx;

        pending_work = I40IW_RING_WORK_AVAILABLE(cqp->sc_cqp.sq_ring);
        wqe_idx = I40IW_RING_GETCURRENT_TAIL(cqp->sc_cqp.sq_ring);
        for (i = 0; i < pending_work; i++) {
                cqp_request = (struct i40iw_cqp_request *)(unsigned long)cqp->scratch_array[wqe_idx];
                if (cqp_request)
                        i40iw_free_pending_cqp_request(cqp, cqp_request);
                wqe_idx = (wqe_idx + 1) % I40IW_RING_GETSIZE(cqp->sc_cqp.sq_ring);
        }

        while (!list_empty(&dev->cqp_cmd_head)) {
                pcmdinfo = (struct cqp_commands_info *)i40iw_remove_head(&dev->cqp_cmd_head);
                cqp_request = container_of(pcmdinfo, struct i40iw_cqp_request, info);
                if (cqp_request)
                        i40iw_free_pending_cqp_request(cqp, cqp_request);
        }
}

/**
 * i40iw_free_qp - callback after destroy cqp completes
 * @cqp_request: cqp request for destroy qp
 * @num: not used
 */
static void i40iw_free_qp(struct i40iw_cqp_request *cqp_request, u32 num)
{
        struct i40iw_sc_qp *qp = (struct i40iw_sc_qp *)cqp_request->param;
        struct i40iw_qp *iwqp = (struct i40iw_qp *)qp->back_qp;
        struct i40iw_device *iwdev;
        u32 qp_num = iwqp->ibqp.qp_num;

        iwdev = iwqp->iwdev;

        i40iw_rem_pdusecount(iwqp->iwpd, iwdev);
        i40iw_free_qp_resources(iwdev, iwqp, qp_num);
        i40iw_rem_devusecount(iwdev);
}

/**
 * i40iw_wait_event - wait for completion
 * @iwdev: iwarp device
 * @cqp_request: cqp request to wait
 */
static int i40iw_wait_event(struct i40iw_device *iwdev,
                            struct i40iw_cqp_request *cqp_request)
{
        struct cqp_commands_info *info = &cqp_request->info;
        struct i40iw_cqp *iwcqp = &iwdev->cqp;
        struct i40iw_cqp_timeout cqp_timeout;
        bool cqp_error = false;
        int err_code = 0;
        memset(&cqp_timeout, 0, sizeof(cqp_timeout));
        cqp_timeout.compl_cqp_cmds = iwdev->sc_dev.cqp_cmd_stats[OP_COMPLETED_COMMANDS];
        do {
                if (wait_event_timeout(cqp_request->waitq,
                                       cqp_request->request_done, CQP_COMPL_WAIT_TIME))
                        break;

                i40iw_check_cqp_progress(&cqp_timeout, &iwdev->sc_dev);

                if (cqp_timeout.count < CQP_TIMEOUT_THRESHOLD)
                        continue;

                i40iw_pr_err("error cqp command 0x%x timed out", info->cqp_cmd);
                err_code = -ETIME;
                if (!iwdev->reset) {
                        iwdev->reset = true;
                        i40iw_request_reset(iwdev);
                }
                goto done;
        } while (1);
        cqp_error = cqp_request->compl_info.error;
        if (cqp_error) {
                i40iw_pr_err("error cqp command 0x%x completion maj = 0x%x min=0x%x\n",
                             info->cqp_cmd, cqp_request->compl_info.maj_err_code,
                             cqp_request->compl_info.min_err_code);
                err_code = -EPROTO;
                goto done;
        }
done:
        i40iw_put_cqp_request(iwcqp, cqp_request);
        return err_code;
}

/**
 * i40iw_handle_cqp_op - process cqp command
 * @iwdev: iwarp device
 * @cqp_request: cqp request to process
 */
enum i40iw_status_code i40iw_handle_cqp_op(struct i40iw_device *iwdev,
                                           struct i40iw_cqp_request
                                           *cqp_request)
{
        struct i40iw_sc_dev *dev = &iwdev->sc_dev;
        enum i40iw_status_code status;
        struct cqp_commands_info *info = &cqp_request->info;
        int err_code = 0;

        if (iwdev->reset) {
                i40iw_free_cqp_request(&iwdev->cqp, cqp_request);
                return I40IW_ERR_CQP_COMPL_ERROR;
        }

        status = i40iw_process_cqp_cmd(dev, info);
        if (status) {
                i40iw_pr_err("error cqp command 0x%x failed\n", info->cqp_cmd);
                i40iw_free_cqp_request(&iwdev->cqp, cqp_request);
                return status;
        }
        if (cqp_request->waiting)
                err_code = i40iw_wait_event(iwdev, cqp_request);
        if (err_code)
                status = I40IW_ERR_CQP_COMPL_ERROR;
        return status;
}

/**
 * i40iw_add_devusecount - add dev refcount
 * @iwdev: dev for refcount
 */
void i40iw_add_devusecount(struct i40iw_device *iwdev)
{
        atomic64_inc(&iwdev->use_count);
}

/**
 * i40iw_rem_devusecount - decrement refcount for dev
 * @iwdev: device
 */
void i40iw_rem_devusecount(struct i40iw_device *iwdev)
{
        if (!atomic64_dec_and_test(&iwdev->use_count))
                return;
        wake_up(&iwdev->close_wq);
}

/**
 * i40iw_add_pdusecount - add pd refcount
 * @iwpd: pd for refcount
 */
void i40iw_add_pdusecount(struct i40iw_pd *iwpd)
{
        atomic_inc(&iwpd->usecount);
}

/**
 * i40iw_rem_pdusecount - decrement refcount for pd and free if 0
 * @iwpd: pd for refcount
 * @iwdev: iwarp device
 */
void i40iw_rem_pdusecount(struct i40iw_pd *iwpd, struct i40iw_device *iwdev)
{
        if (!atomic_dec_and_test(&iwpd->usecount))
                return;
        i40iw_free_resource(iwdev, iwdev->allocated_pds, iwpd->sc_pd.pd_id);
}

/**
 * i40iw_add_ref - add refcount for qp
 * @ibqp: iqarp qp
 */
void i40iw_add_ref(struct ib_qp *ibqp)
{
        struct i40iw_qp *iwqp = (struct i40iw_qp *)ibqp;

        atomic_inc(&iwqp->refcount);
}

/**
 * i40iw_rem_ref - rem refcount for qp and free if 0
 * @ibqp: iqarp qp
 */
void i40iw_rem_ref(struct ib_qp *ibqp)
{
        struct i40iw_qp *iwqp;
        enum i40iw_status_code status;
        struct i40iw_cqp_request *cqp_request;
        struct cqp_commands_info *cqp_info;
        struct i40iw_device *iwdev;
        u32 qp_num;
        unsigned long flags;

        iwqp = to_iwqp(ibqp);
        iwdev = iwqp->iwdev;
        spin_lock_irqsave(&iwdev->qptable_lock, flags);
        if (!atomic_dec_and_test(&iwqp->refcount)) {
                spin_unlock_irqrestore(&iwdev->qptable_lock, flags);
                return;
        }

        qp_num = iwqp->ibqp.qp_num;
        iwdev->qp_table[qp_num] = NULL;
        spin_unlock_irqrestore(&iwdev->qptable_lock, flags);
        cqp_request = i40iw_get_cqp_request(&iwdev->cqp, false);
        if (!cqp_request)
                return;

        cqp_request->callback_fcn = i40iw_free_qp;
        cqp_request->param = (void *)&iwqp->sc_qp;
        cqp_info = &cqp_request->info;
        cqp_info->cqp_cmd = OP_QP_DESTROY;
        cqp_info->post_sq = 1;
        cqp_info->in.u.qp_destroy.qp = &iwqp->sc_qp;
        cqp_info->in.u.qp_destroy.scratch = (uintptr_t)cqp_request;
        cqp_info->in.u.qp_destroy.remove_hash_idx = true;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (!status)
                return;

        i40iw_rem_pdusecount(iwqp->iwpd, iwdev);
        i40iw_free_qp_resources(iwdev, iwqp, qp_num);
        i40iw_rem_devusecount(iwdev);
}

/**
 * i40iw_get_qp - get qp address
 * @device: iwarp device
 * @qpn: qp number
 */
struct ib_qp *i40iw_get_qp(struct ib_device *device, int qpn)
{
        struct i40iw_device *iwdev = to_iwdev(device);

        if ((qpn < IW_FIRST_QPN) || (qpn >= iwdev->max_qp))
                return NULL;

        return &iwdev->qp_table[qpn]->ibqp;
}

/**
 * i40iw_debug_buf - print debug msg and buffer is mask set
 * @dev: hardware control device structure
 * @mask: mask to compare if to print debug buffer
 * @buf: points buffer addr
 * @size: saize of buffer to print
 */
void i40iw_debug_buf(struct i40iw_sc_dev *dev,
                     enum i40iw_debug_flag mask,
                     char *desc,
                     u64 *buf,
                     u32 size)
{
        u32 i;

        if (!(dev->debug_mask & mask))
                return;
        i40iw_debug(dev, mask, "%s\n", desc);
        i40iw_debug(dev, mask, "starting address virt=%p phy=%llxh\n", buf,
                    (unsigned long long)virt_to_phys(buf));

        for (i = 0; i < size; i += 8)
                i40iw_debug(dev, mask, "index %03d val: %016llx\n", i, buf[i / 8]);
}

/**
 * i40iw_get_hw_addr - return hw addr
 * @par: points to shared dev
 */
u8 __iomem *i40iw_get_hw_addr(void *par)
{
        struct i40iw_sc_dev *dev = (struct i40iw_sc_dev *)par;

        return dev->hw->hw_addr;
}

/**
 * i40iw_remove_head - return head entry and remove from list
 * @list: list for entry
 */
void *i40iw_remove_head(struct list_head *list)
{
        struct list_head *entry;

        if (list_empty(list))
                return NULL;

        entry = (void *)list->next;
        list_del(entry);
        return (void *)entry;
}

/**
 * i40iw_allocate_dma_mem - Memory alloc helper fn
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to fill out
 * @size: size of memory requested
 * @alignment: what to align the allocation to
 */
enum i40iw_status_code i40iw_allocate_dma_mem(struct i40iw_hw *hw,
                                              struct i40iw_dma_mem *mem,
                                              u64 size,
                                              u32 alignment)
{
        struct pci_dev *pcidev = (struct pci_dev *)hw->dev_context;

        if (!mem)
                return I40IW_ERR_PARAM;
        mem->size = ALIGN(size, alignment);
        mem->va = dma_alloc_coherent(&pcidev->dev, mem->size,
                                     (dma_addr_t *)&mem->pa, GFP_KERNEL);
        if (!mem->va)
                return I40IW_ERR_NO_MEMORY;
        return 0;
}

/**
 * i40iw_free_dma_mem - Memory free helper fn
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 */
void i40iw_free_dma_mem(struct i40iw_hw *hw, struct i40iw_dma_mem *mem)
{
        struct pci_dev *pcidev = (struct pci_dev *)hw->dev_context;

        if (!mem || !mem->va)
                return;

        dma_free_coherent(&pcidev->dev, mem->size,
                          mem->va, (dma_addr_t)mem->pa);
        mem->va = NULL;
}

/**
 * i40iw_allocate_virt_mem - virtual memory alloc helper fn
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to fill out
 * @size: size of memory requested
 */
enum i40iw_status_code i40iw_allocate_virt_mem(struct i40iw_hw *hw,
                                               struct i40iw_virt_mem *mem,
                                               u32 size)
{
        if (!mem)
                return I40IW_ERR_PARAM;

        mem->size = size;
        mem->va = kzalloc(size, GFP_KERNEL);

        if (mem->va)
                return 0;
        else
                return I40IW_ERR_NO_MEMORY;
}

/**
 * i40iw_free_virt_mem - virtual memory free helper fn
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 */
enum i40iw_status_code i40iw_free_virt_mem(struct i40iw_hw *hw,
                                           struct i40iw_virt_mem *mem)
{
        if (!mem)
                return I40IW_ERR_PARAM;
        /*
         * mem->va points to the parent of mem, so both mem and mem->va
         * can not be touched once mem->va is freed
         */
        kfree(mem->va);
        return 0;
}

/**
 * i40iw_cqp_sds_cmd - create cqp command for sd
 * @dev: hardware control device structure
 * @sd_info: information  for sd cqp
 *
 */
enum i40iw_status_code i40iw_cqp_sds_cmd(struct i40iw_sc_dev *dev,
                                         struct i40iw_update_sds_info *sdinfo)
{
        enum i40iw_status_code status;
        struct i40iw_cqp_request *cqp_request;
        struct cqp_commands_info *cqp_info;
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;

        cqp_request = i40iw_get_cqp_request(&iwdev->cqp, true);
        if (!cqp_request)
                return I40IW_ERR_NO_MEMORY;
        cqp_info = &cqp_request->info;
        memcpy(&cqp_info->in.u.update_pe_sds.info, sdinfo,
               sizeof(cqp_info->in.u.update_pe_sds.info));
        cqp_info->cqp_cmd = OP_UPDATE_PE_SDS;
        cqp_info->post_sq = 1;
        cqp_info->in.u.update_pe_sds.dev = dev;
        cqp_info->in.u.update_pe_sds.scratch = (uintptr_t)cqp_request;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (status)
                i40iw_pr_err("CQP-OP Update SD's fail");
        return status;
}

/**
 * i40iw_qp_suspend_resume - cqp command for suspend/resume
 * @dev: hardware control device structure
 * @qp: hardware control qp
 * @suspend: flag if suspend or resume
 */
void i40iw_qp_suspend_resume(struct i40iw_sc_dev *dev, struct i40iw_sc_qp *qp, bool suspend)
{
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;
        struct i40iw_cqp_request *cqp_request;
        struct i40iw_sc_cqp *cqp = dev->cqp;
        struct cqp_commands_info *cqp_info;
        enum i40iw_status_code status;

        cqp_request = i40iw_get_cqp_request(&iwdev->cqp, false);
        if (!cqp_request)
                return;

        cqp_info = &cqp_request->info;
        cqp_info->cqp_cmd = (suspend) ? OP_SUSPEND : OP_RESUME;
        cqp_info->in.u.suspend_resume.cqp = cqp;
        cqp_info->in.u.suspend_resume.qp = qp;
        cqp_info->in.u.suspend_resume.scratch = (uintptr_t)cqp_request;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (status)
                i40iw_pr_err("CQP-OP QP Suspend/Resume fail");
}

/**
 * i40iw_term_modify_qp - modify qp for term message
 * @qp: hardware control qp
 * @next_state: qp's next state
 * @term: terminate code
 * @term_len: length
 */
void i40iw_term_modify_qp(struct i40iw_sc_qp *qp, u8 next_state, u8 term, u8 term_len)
{
        struct i40iw_qp *iwqp;

        iwqp = (struct i40iw_qp *)qp->back_qp;
        i40iw_next_iw_state(iwqp, next_state, 0, term, term_len);
};

/**
 * i40iw_terminate_done - after terminate is completed
 * @qp: hardware control qp
 * @timeout_occurred: indicates if terminate timer expired
 */
void i40iw_terminate_done(struct i40iw_sc_qp *qp, int timeout_occurred)
{
        struct i40iw_qp *iwqp;
        u32 next_iwarp_state = I40IW_QP_STATE_ERROR;
        u8 hte = 0;
        bool first_time;
        unsigned long flags;

        iwqp = (struct i40iw_qp *)qp->back_qp;
        spin_lock_irqsave(&iwqp->lock, flags);
        if (iwqp->hte_added) {
                iwqp->hte_added = 0;
                hte = 1;
        }
        first_time = !(qp->term_flags & I40IW_TERM_DONE);
        qp->term_flags |= I40IW_TERM_DONE;
        spin_unlock_irqrestore(&iwqp->lock, flags);
        if (first_time) {
                if (!timeout_occurred)
                        i40iw_terminate_del_timer(qp);
                else
                        next_iwarp_state = I40IW_QP_STATE_CLOSING;

                i40iw_next_iw_state(iwqp, next_iwarp_state, hte, 0, 0);
                i40iw_cm_disconn(iwqp);
        }
}

/**
 * i40iw_terminate_imeout - timeout happened
 * @context: points to iwarp qp
 */
static void i40iw_terminate_timeout(struct timer_list *t)
{
        struct i40iw_qp *iwqp = from_timer(iwqp, t, terminate_timer);
        struct i40iw_sc_qp *qp = (struct i40iw_sc_qp *)&iwqp->sc_qp;

        i40iw_terminate_done(qp, 1);
        i40iw_rem_ref(&iwqp->ibqp);
}

/**
 * i40iw_terminate_start_timer - start terminate timeout
 * @qp: hardware control qp
 */
void i40iw_terminate_start_timer(struct i40iw_sc_qp *qp)
{
        struct i40iw_qp *iwqp;

        iwqp = (struct i40iw_qp *)qp->back_qp;
        i40iw_add_ref(&iwqp->ibqp);
        timer_setup(&iwqp->terminate_timer, i40iw_terminate_timeout, 0);
        iwqp->terminate_timer.expires = jiffies + HZ;
        add_timer(&iwqp->terminate_timer);
}

/**
 * i40iw_terminate_del_timer - delete terminate timeout
 * @qp: hardware control qp
 */
void i40iw_terminate_del_timer(struct i40iw_sc_qp *qp)
{
        struct i40iw_qp *iwqp;

        iwqp = (struct i40iw_qp *)qp->back_qp;
        if (del_timer(&iwqp->terminate_timer))
                i40iw_rem_ref(&iwqp->ibqp);
}

/**
 * i40iw_cqp_generic_worker - generic worker for cqp
 * @work: work pointer
 */
static void i40iw_cqp_generic_worker(struct work_struct *work)
{
        struct i40iw_virtchnl_work_info *work_info =
            &((struct virtchnl_work *)work)->work_info;

        if (work_info->worker_vf_dev)
                work_info->callback_fcn(work_info->worker_vf_dev);
}

/**
 * i40iw_cqp_spawn_worker - spawn worket thread
 * @iwdev: device struct pointer
 * @work_info: work request info
 * @iw_vf_idx: virtual function index
 */
void i40iw_cqp_spawn_worker(struct i40iw_sc_dev *dev,
                            struct i40iw_virtchnl_work_info *work_info,
                            u32 iw_vf_idx)
{
        struct virtchnl_work *work;
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;

        work = &iwdev->virtchnl_w[iw_vf_idx];
        memcpy(&work->work_info, work_info, sizeof(*work_info));
        INIT_WORK(&work->work, i40iw_cqp_generic_worker);

        queue_work(iwdev->virtchnl_wq, &work->work);
}

/**
 * i40iw_cqp_manage_hmc_fcn_worker -
 * @work: work pointer for hmc info
 */
static void i40iw_cqp_manage_hmc_fcn_worker(struct work_struct *work)
{
        struct i40iw_cqp_request *cqp_request =
            ((struct virtchnl_work *)work)->cqp_request;
        struct i40iw_ccq_cqe_info ccq_cqe_info;
        struct i40iw_hmc_fcn_info *hmcfcninfo =
                        &cqp_request->info.in.u.manage_hmc_pm.info;
        struct i40iw_device *iwdev =
            (struct i40iw_device *)cqp_request->info.in.u.manage_hmc_pm.dev->back_dev;

        ccq_cqe_info.cqp = NULL;
        ccq_cqe_info.maj_err_code = cqp_request->compl_info.maj_err_code;
        ccq_cqe_info.min_err_code = cqp_request->compl_info.min_err_code;
        ccq_cqe_info.op_code = cqp_request->compl_info.op_code;
        ccq_cqe_info.op_ret_val = cqp_request->compl_info.op_ret_val;
        ccq_cqe_info.scratch = 0;
        ccq_cqe_info.error = cqp_request->compl_info.error;
        hmcfcninfo->callback_fcn(cqp_request->info.in.u.manage_hmc_pm.dev,
                                 hmcfcninfo->cqp_callback_param, &ccq_cqe_info);
        i40iw_put_cqp_request(&iwdev->cqp, cqp_request);
}

/**
 * i40iw_cqp_manage_hmc_fcn_callback - called function after cqp completion
 * @cqp_request: cqp request info struct for hmc fun
 * @unused: unused param of callback
 */
static void i40iw_cqp_manage_hmc_fcn_callback(struct i40iw_cqp_request *cqp_request,
                                              u32 unused)
{
        struct virtchnl_work *work;
        struct i40iw_hmc_fcn_info *hmcfcninfo =
            &cqp_request->info.in.u.manage_hmc_pm.info;
        struct i40iw_device *iwdev =
            (struct i40iw_device *)cqp_request->info.in.u.manage_hmc_pm.dev->
            back_dev;

        if (hmcfcninfo && hmcfcninfo->callback_fcn) {
                i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_HMC, "%s1\n", __func__);
                atomic_inc(&cqp_request->refcount);
                work = &iwdev->virtchnl_w[hmcfcninfo->iw_vf_idx];
                work->cqp_request = cqp_request;
                INIT_WORK(&work->work, i40iw_cqp_manage_hmc_fcn_worker);
                queue_work(iwdev->virtchnl_wq, &work->work);
                i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_HMC, "%s2\n", __func__);
        } else {
                i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_HMC, "%s: Something wrong\n", __func__);
        }
}

/**
 * i40iw_cqp_manage_hmc_fcn_cmd - issue cqp command to manage hmc
 * @dev: hardware control device structure
 * @hmcfcninfo: info for hmc
 */
enum i40iw_status_code i40iw_cqp_manage_hmc_fcn_cmd(struct i40iw_sc_dev *dev,
                                                    struct i40iw_hmc_fcn_info *hmcfcninfo)
{
        enum i40iw_status_code status;
        struct i40iw_cqp_request *cqp_request;
        struct cqp_commands_info *cqp_info;
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;

        i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_HMC, "%s\n", __func__);
        cqp_request = i40iw_get_cqp_request(&iwdev->cqp, false);
        if (!cqp_request)
                return I40IW_ERR_NO_MEMORY;
        cqp_info = &cqp_request->info;
        cqp_request->callback_fcn = i40iw_cqp_manage_hmc_fcn_callback;
        cqp_request->param = hmcfcninfo;
        memcpy(&cqp_info->in.u.manage_hmc_pm.info, hmcfcninfo,
               sizeof(*hmcfcninfo));
        cqp_info->in.u.manage_hmc_pm.dev = dev;
        cqp_info->cqp_cmd = OP_MANAGE_HMC_PM_FUNC_TABLE;
        cqp_info->post_sq = 1;
        cqp_info->in.u.manage_hmc_pm.scratch = (uintptr_t)cqp_request;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (status)
                i40iw_pr_err("CQP-OP Manage HMC fail");
        return status;
}

/**
 * i40iw_cqp_query_fpm_values_cmd - send cqp command for fpm
 * @iwdev: function device struct
 * @values_mem: buffer for fpm
 * @hmc_fn_id: function id for fpm
 */
enum i40iw_status_code i40iw_cqp_query_fpm_values_cmd(struct i40iw_sc_dev *dev,
                                                      struct i40iw_dma_mem *values_mem,
                                                      u8 hmc_fn_id)
{
        enum i40iw_status_code status;
        struct i40iw_cqp_request *cqp_request;
        struct cqp_commands_info *cqp_info;
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;

        cqp_request = i40iw_get_cqp_request(&iwdev->cqp, true);
        if (!cqp_request)
                return I40IW_ERR_NO_MEMORY;
        cqp_info = &cqp_request->info;
        cqp_request->param = NULL;
        cqp_info->in.u.query_fpm_values.cqp = dev->cqp;
        cqp_info->in.u.query_fpm_values.fpm_values_pa = values_mem->pa;
        cqp_info->in.u.query_fpm_values.fpm_values_va = values_mem->va;
        cqp_info->in.u.query_fpm_values.hmc_fn_id = hmc_fn_id;
        cqp_info->cqp_cmd = OP_QUERY_FPM_VALUES;
        cqp_info->post_sq = 1;
        cqp_info->in.u.query_fpm_values.scratch = (uintptr_t)cqp_request;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (status)
                i40iw_pr_err("CQP-OP Query FPM fail");
        return status;
}

/**
 * i40iw_cqp_commit_fpm_values_cmd - commit fpm values in hw
 * @dev: hardware control device structure
 * @values_mem: buffer with fpm values
 * @hmc_fn_id: function id for fpm
 */
enum i40iw_status_code i40iw_cqp_commit_fpm_values_cmd(struct i40iw_sc_dev *dev,
                                                       struct i40iw_dma_mem *values_mem,
                                                       u8 hmc_fn_id)
{
        enum i40iw_status_code status;
        struct i40iw_cqp_request *cqp_request;
        struct cqp_commands_info *cqp_info;
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;

        cqp_request = i40iw_get_cqp_request(&iwdev->cqp, true);
        if (!cqp_request)
                return I40IW_ERR_NO_MEMORY;
        cqp_info = &cqp_request->info;
        cqp_request->param = NULL;
        cqp_info->in.u.commit_fpm_values.cqp = dev->cqp;
        cqp_info->in.u.commit_fpm_values.fpm_values_pa = values_mem->pa;
        cqp_info->in.u.commit_fpm_values.fpm_values_va = values_mem->va;
        cqp_info->in.u.commit_fpm_values.hmc_fn_id = hmc_fn_id;
        cqp_info->cqp_cmd = OP_COMMIT_FPM_VALUES;
        cqp_info->post_sq = 1;
        cqp_info->in.u.commit_fpm_values.scratch = (uintptr_t)cqp_request;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (status)
                i40iw_pr_err("CQP-OP Commit FPM fail");
        return status;
}

/**
 * i40iw_vf_wait_vchnl_resp - wait for channel msg
 * @iwdev: function's device struct
 */
enum i40iw_status_code i40iw_vf_wait_vchnl_resp(struct i40iw_sc_dev *dev)
{
        struct i40iw_device *iwdev = dev->back_dev;
        int timeout_ret;

        i40iw_debug(dev, I40IW_DEBUG_VIRT, "%s[%u] dev %p, iwdev %p\n",
                    __func__, __LINE__, dev, iwdev);

        atomic_set(&iwdev->vchnl_msgs, 2);
        timeout_ret = wait_event_timeout(iwdev->vchnl_waitq,
                                         (atomic_read(&iwdev->vchnl_msgs) == 1),
                                         I40IW_VCHNL_EVENT_TIMEOUT);
        atomic_dec(&iwdev->vchnl_msgs);
        if (!timeout_ret) {
                i40iw_pr_err("virt channel completion timeout = 0x%x\n", timeout_ret);
                atomic_set(&iwdev->vchnl_msgs, 0);
                dev->vchnl_up = false;
                return I40IW_ERR_TIMEOUT;
        }
        wake_up(&dev->vf_reqs);
        return 0;
}

/**
 * i40iw_cqp_cq_create_cmd - create a cq for the cqp
 * @dev: device pointer
 * @cq: pointer to created cq
 */
enum i40iw_status_code i40iw_cqp_cq_create_cmd(struct i40iw_sc_dev *dev,
                                               struct i40iw_sc_cq *cq)
{
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;
        struct i40iw_cqp *iwcqp = &iwdev->cqp;
        struct i40iw_cqp_request *cqp_request;
        struct cqp_commands_info *cqp_info;
        enum i40iw_status_code status;

        cqp_request = i40iw_get_cqp_request(iwcqp, true);
        if (!cqp_request)
                return I40IW_ERR_NO_MEMORY;

        cqp_info = &cqp_request->info;
        cqp_info->cqp_cmd = OP_CQ_CREATE;
        cqp_info->post_sq = 1;
        cqp_info->in.u.cq_create.cq = cq;
        cqp_info->in.u.cq_create.scratch = (uintptr_t)cqp_request;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (status)
                i40iw_pr_err("CQP-OP Create QP fail");

        return status;
}

/**
 * i40iw_cqp_qp_create_cmd - create a qp for the cqp
 * @dev: device pointer
 * @qp: pointer to created qp
 */
enum i40iw_status_code i40iw_cqp_qp_create_cmd(struct i40iw_sc_dev *dev,
                                               struct i40iw_sc_qp *qp)
{
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;
        struct i40iw_cqp *iwcqp = &iwdev->cqp;
        struct i40iw_cqp_request *cqp_request;
        struct cqp_commands_info *cqp_info;
        struct i40iw_create_qp_info *qp_info;
        enum i40iw_status_code status;

        cqp_request = i40iw_get_cqp_request(iwcqp, true);
        if (!cqp_request)
                return I40IW_ERR_NO_MEMORY;

        cqp_info = &cqp_request->info;
        qp_info = &cqp_request->info.in.u.qp_create.info;

        memset(qp_info, 0, sizeof(*qp_info));

        qp_info->cq_num_valid = true;
        qp_info->next_iwarp_state = I40IW_QP_STATE_RTS;

        cqp_info->cqp_cmd = OP_QP_CREATE;
        cqp_info->post_sq = 1;
        cqp_info->in.u.qp_create.qp = qp;
        cqp_info->in.u.qp_create.scratch = (uintptr_t)cqp_request;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (status)
                i40iw_pr_err("CQP-OP QP create fail");
        return status;
}

/**
 * i40iw_cqp_cq_destroy_cmd - destroy the cqp cq
 * @dev: device pointer
 * @cq: pointer to cq
 */
void i40iw_cqp_cq_destroy_cmd(struct i40iw_sc_dev *dev, struct i40iw_sc_cq *cq)
{
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;

        i40iw_cq_wq_destroy(iwdev, cq);
}

/**
 * i40iw_cqp_qp_destroy_cmd - destroy the cqp
 * @dev: device pointer
 * @qp: pointer to qp
 */
void i40iw_cqp_qp_destroy_cmd(struct i40iw_sc_dev *dev, struct i40iw_sc_qp *qp)
{
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;
        struct i40iw_cqp *iwcqp = &iwdev->cqp;
        struct i40iw_cqp_request *cqp_request;
        struct cqp_commands_info *cqp_info;
        enum i40iw_status_code status;

        cqp_request = i40iw_get_cqp_request(iwcqp, true);
        if (!cqp_request)
                return;

        cqp_info = &cqp_request->info;
        memset(cqp_info, 0, sizeof(*cqp_info));

        cqp_info->cqp_cmd = OP_QP_DESTROY;
        cqp_info->post_sq = 1;
        cqp_info->in.u.qp_destroy.qp = qp;
        cqp_info->in.u.qp_destroy.scratch = (uintptr_t)cqp_request;
        cqp_info->in.u.qp_destroy.remove_hash_idx = true;
        status = i40iw_handle_cqp_op(iwdev, cqp_request);
        if (status)
                i40iw_pr_err("CQP QP_DESTROY fail");
}


/**
 * i40iw_ieq_mpa_crc_ae - generate AE for crc error
 * @dev: hardware control device structure
 * @qp: hardware control qp
 */
void i40iw_ieq_mpa_crc_ae(struct i40iw_sc_dev *dev, struct i40iw_sc_qp *qp)
{
        struct i40iw_gen_ae_info info;
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;

        i40iw_debug(dev, I40IW_DEBUG_AEQ, "%s entered\n", __func__);
        info.ae_code = I40IW_AE_LLP_RECEIVED_MPA_CRC_ERROR;
        info.ae_source = I40IW_AE_SOURCE_RQ;
        i40iw_gen_ae(iwdev, qp, &info, false);
}

/**
 * i40iw_init_hash_desc - initialize hash for crc calculation
 * @desc: cryption type
 */
enum i40iw_status_code i40iw_init_hash_desc(struct shash_desc **desc)
{
        struct crypto_shash *tfm;
        struct shash_desc *tdesc;

        tfm = crypto_alloc_shash("crc32c", 0, 0);
        if (IS_ERR(tfm))
                return I40IW_ERR_MPA_CRC;

        tdesc = kzalloc(sizeof(*tdesc) + crypto_shash_descsize(tfm),
                        GFP_KERNEL);
        if (!tdesc) {
                crypto_free_shash(tfm);
                return I40IW_ERR_MPA_CRC;
        }
        tdesc->tfm = tfm;
        *desc = tdesc;

        return 0;
}

/**
 * i40iw_free_hash_desc - free hash desc
 * @desc: to be freed
 */
void i40iw_free_hash_desc(struct shash_desc *desc)
{
        if (desc) {
                crypto_free_shash(desc->tfm);
                kfree(desc);
        }
}

/**
 * i40iw_alloc_query_fpm_buf - allocate buffer for fpm
 * @dev: hardware control device structure
 * @mem: buffer ptr for fpm to be allocated
 * @return: memory allocation status
 */
enum i40iw_status_code i40iw_alloc_query_fpm_buf(struct i40iw_sc_dev *dev,
                                                 struct i40iw_dma_mem *mem)
{
        enum i40iw_status_code status;
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;

        status = i40iw_obj_aligned_mem(iwdev, mem, I40IW_QUERY_FPM_BUF_SIZE,
                                       I40IW_FPM_QUERY_BUF_ALIGNMENT_MASK);
        return status;
}

/**
 * i40iw_ieq_check_mpacrc - check if mpa crc is OK
 * @desc: desc for hash
 * @addr: address of buffer for crc
 * @length: length of buffer
 * @value: value to be compared
 */
enum i40iw_status_code i40iw_ieq_check_mpacrc(struct shash_desc *desc,
                                              void *addr,
                                              u32 length,
                                              u32 value)
{
        u32 crc = 0;
        int ret;
        enum i40iw_status_code ret_code = 0;

        crypto_shash_init(desc);
        ret = crypto_shash_update(desc, addr, length);
        if (!ret)
                crypto_shash_final(desc, (u8 *)&crc);
        if (crc != value) {
                i40iw_pr_err("mpa crc check fail\n");
                ret_code = I40IW_ERR_MPA_CRC;
        }
        return ret_code;
}

/**
 * i40iw_ieq_get_qp - get qp based on quad in puda buffer
 * @dev: hardware control device structure
 * @buf: receive puda buffer on exception q
 */
struct i40iw_sc_qp *i40iw_ieq_get_qp(struct i40iw_sc_dev *dev,
                                     struct i40iw_puda_buf *buf)
{
        struct i40iw_device *iwdev = (struct i40iw_device *)dev->back_dev;
        struct i40iw_qp *iwqp;
        struct i40iw_cm_node *cm_node;
        u32 loc_addr[4], rem_addr[4];
        u16 loc_port, rem_port;
        struct ipv6hdr *ip6h;
        struct iphdr *iph = (struct iphdr *)buf->iph;
        struct tcphdr *tcph = (struct tcphdr *)buf->tcph;

        if (iph->version == 4) {
                memset(loc_addr, 0, sizeof(loc_addr));
                loc_addr[0] = ntohl(iph->daddr);
                memset(rem_addr, 0, sizeof(rem_addr));
                rem_addr[0] = ntohl(iph->saddr);
        } else {
                ip6h = (struct ipv6hdr *)buf->iph;
                i40iw_copy_ip_ntohl(loc_addr, ip6h->daddr.in6_u.u6_addr32);
                i40iw_copy_ip_ntohl(rem_addr, ip6h->saddr.in6_u.u6_addr32);
        }
        loc_port = ntohs(tcph->dest);
        rem_port = ntohs(tcph->source);

        cm_node = i40iw_find_node(&iwdev->cm_core, rem_port, rem_addr, loc_port,
                                  loc_addr, false, true);
        if (!cm_node)
                return NULL;
        iwqp = cm_node->iwqp;
        return &iwqp->sc_qp;
}

/**
 * i40iw_ieq_update_tcpip_info - update tcpip in the buffer
 * @buf: puda to update
 * @length: length of buffer
 * @seqnum: seq number for tcp
 */
void i40iw_ieq_update_tcpip_info(struct i40iw_puda_buf *buf, u16 length, u32 seqnum)
{
        struct tcphdr *tcph;
        struct iphdr *iph;
        u16 iphlen;
        u16 packetsize;
        u8 *addr = (u8 *)buf->mem.va;

        iphlen = (buf->ipv4) ? 20 : 40;
        iph = (struct iphdr *)(addr + buf->maclen);
        tcph = (struct tcphdr *)(addr + buf->maclen + iphlen);
        packetsize = length + buf->tcphlen + iphlen;

        iph->tot_len = htons(packetsize);
        tcph->seq = htonl(seqnum);
}

/**
 * i40iw_puda_get_tcpip_info - get tcpip info from puda buffer
 * @info: to get information
 * @buf: puda buffer
 */
enum i40iw_status_code i40iw_puda_get_tcpip_info(struct i40iw_puda_completion_info *info,
                                                 struct i40iw_puda_buf *buf)
{
        struct iphdr *iph;
        struct ipv6hdr *ip6h;
        struct tcphdr *tcph;
        u16 iphlen;
        u16 pkt_len;
        u8 *mem = (u8 *)buf->mem.va;
        struct ethhdr *ethh = (struct ethhdr *)buf->mem.va;

        if (ethh->h_proto == htons(0x8100)) {
                info->vlan_valid = true;
                buf->vlan_id = ntohs(((struct vlan_ethhdr *)ethh)->h_vlan_TCI) & VLAN_VID_MASK;
        }
        buf->maclen = (info->vlan_valid) ? 18 : 14;
        iphlen = (info->l3proto) ? 40 : 20;
        buf->ipv4 = (info->l3proto) ? false : true;
        buf->iph = mem + buf->maclen;
        iph = (struct iphdr *)buf->iph;

        buf->tcph = buf->iph + iphlen;
        tcph = (struct tcphdr *)buf->tcph;

        if (buf->ipv4) {
                pkt_len = ntohs(iph->tot_len);
        } else {
                ip6h = (struct ipv6hdr *)buf->iph;
                pkt_len = ntohs(ip6h->payload_len) + iphlen;
        }

        buf->totallen = pkt_len + buf->maclen;

        if (info->payload_len < buf->totallen) {
                i40iw_pr_err("payload_len = 0x%x totallen expected0x%x\n",
                             info->payload_len, buf->totallen);
                return I40IW_ERR_INVALID_SIZE;
        }

        buf->tcphlen = (tcph->doff) << 2;
        buf->datalen = pkt_len - iphlen - buf->tcphlen;
        buf->data = (buf->datalen) ? buf->tcph + buf->tcphlen : NULL;
        buf->hdrlen = buf->maclen + iphlen + buf->tcphlen;
        buf->seqnum = ntohl(tcph->seq);
        return 0;
}

/**
 * i40iw_hw_stats_timeout - Stats timer-handler which updates all HW stats
 * @vsi: pointer to the vsi structure
 */
static void i40iw_hw_stats_timeout(struct timer_list *t)
{
        struct i40iw_vsi_pestat *pf_devstat = from_timer(pf_devstat, t,
                                                       stats_timer);
        struct i40iw_sc_vsi *sc_vsi = pf_devstat->vsi;
        struct i40iw_sc_dev *pf_dev = sc_vsi->dev;
        struct i40iw_vsi_pestat *vf_devstat = NULL;
        u16 iw_vf_idx;
        unsigned long flags;

        /*PF*/
        i40iw_hw_stats_read_all(pf_devstat, &pf_devstat->hw_stats);

        for (iw_vf_idx = 0; iw_vf_idx < I40IW_MAX_PE_ENABLED_VF_COUNT; iw_vf_idx++) {
                spin_lock_irqsave(&pf_devstat->lock, flags);
                if (pf_dev->vf_dev[iw_vf_idx]) {
                        if (pf_dev->vf_dev[iw_vf_idx]->stats_initialized) {
                                vf_devstat = &pf_dev->vf_dev[iw_vf_idx]->pestat;
                                i40iw_hw_stats_read_all(vf_devstat, &vf_devstat->hw_stats);
                        }
                }
                spin_unlock_irqrestore(&pf_devstat->lock, flags);
        }

        mod_timer(&pf_devstat->stats_timer,
                  jiffies + msecs_to_jiffies(STATS_TIMER_DELAY));
}

/**
 * i40iw_hw_stats_start_timer - Start periodic stats timer
 * @vsi: pointer to the vsi structure
 */
void i40iw_hw_stats_start_timer(struct i40iw_sc_vsi *vsi)
{
        struct i40iw_vsi_pestat *devstat = vsi->pestat;

        timer_setup(&devstat->stats_timer, i40iw_hw_stats_timeout, 0);
        mod_timer(&devstat->stats_timer,
                  jiffies + msecs_to_jiffies(STATS_TIMER_DELAY));
}

/**
 * i40iw_hw_stats_stop_timer - Delete periodic stats timer
 * @vsi: pointer to the vsi structure
 */
void i40iw_hw_stats_stop_timer(struct i40iw_sc_vsi *vsi)
{
        struct i40iw_vsi_pestat *devstat = vsi->pestat;

        del_timer_sync(&devstat->stats_timer);
}