/*******************************************************************************
 *
 * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver
 * Copyright(c) 2013 - 2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.  If not, see <http://www.gnu.org/licenses/>.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Contact Information:
 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 ******************************************************************************/

#include "i40evf.h"
#include "i40e_prototype.h"

/* busy wait delay in msec */
#define I40EVF_BUSY_WAIT_DELAY 10
#define I40EVF_BUSY_WAIT_COUNT 50

/**
 * i40evf_send_pf_msg
 * @adapter: adapter structure
 * @op: virtual channel opcode
 * @msg: pointer to message buffer
 * @len: message length
 *
 * Send message to PF and print status if failure.
 **/
static int i40evf_send_pf_msg(struct i40evf_adapter *adapter,
                              enum i40e_virtchnl_ops op, u8 *msg, u16 len)
{
        struct i40e_hw *hw = &adapter->hw;
        i40e_status err;

        if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED)
                return 0; /* nothing to see here, move along */

        err = i40e_aq_send_msg_to_pf(hw, op, 0, msg, len, NULL);
        if (err)
                dev_err(&adapter->pdev->dev, "Unable to send opcode %d to PF, error %d, aq status %d\n",
                        op, err, hw->aq.asq_last_status);
        return err;
}

/**
 * i40evf_send_api_ver
 * @adapter: adapter structure
 *
 * Send API version admin queue message to the PF. The reply is not checked
 * in this function. Returns 0 if the message was successfully
 * sent, or one of the I40E_ADMIN_QUEUE_ERROR_ statuses if not.
 **/
int i40evf_send_api_ver(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_version_info vvi;

        vvi.major = I40E_VIRTCHNL_VERSION_MAJOR;
        vvi.minor = I40E_VIRTCHNL_VERSION_MINOR;

        return i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_VERSION, (u8 *)&vvi,
                                  sizeof(vvi));
}

/**
 * i40evf_verify_api_ver
 * @adapter: adapter structure
 *
 * Compare API versions with the PF. Must be called after admin queue is
 * initialized. Returns 0 if API versions match, -EIO if
 * they do not, or I40E_ERR_ADMIN_QUEUE_NO_WORK if the admin queue is empty.
 **/
int i40evf_verify_api_ver(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_version_info *pf_vvi;
        struct i40e_hw *hw = &adapter->hw;
        struct i40e_arq_event_info event;
        i40e_status err;

        event.msg_size = I40EVF_MAX_AQ_BUF_SIZE;
        event.msg_buf = kzalloc(event.msg_size, GFP_KERNEL);
        if (!event.msg_buf) {
                err = -ENOMEM;
                goto out;
        }

        err = i40evf_clean_arq_element(hw, &event, NULL);
        if (err == I40E_ERR_ADMIN_QUEUE_NO_WORK)
                goto out_alloc;

        err = (i40e_status)le32_to_cpu(event.desc.cookie_low);
        if (err) {
                err = -EIO;
                goto out_alloc;
        }

        if ((enum i40e_virtchnl_ops)le32_to_cpu(event.desc.cookie_high) !=
            I40E_VIRTCHNL_OP_VERSION) {
                err = -EIO;
                goto out_alloc;
        }

        pf_vvi = (struct i40e_virtchnl_version_info *)event.msg_buf;
        if ((pf_vvi->major != I40E_VIRTCHNL_VERSION_MAJOR) ||
            (pf_vvi->minor != I40E_VIRTCHNL_VERSION_MINOR))
                err = -EIO;

out_alloc:
        kfree(event.msg_buf);
out:
        return err;
}

/**
 * i40evf_send_vf_config_msg
 * @adapter: adapter structure
 *
 * Send VF configuration request admin queue message to the PF. The reply
 * is not checked in this function. Returns 0 if the message was
 * successfully sent, or one of the I40E_ADMIN_QUEUE_ERROR_ statuses if not.
 **/
int i40evf_send_vf_config_msg(struct i40evf_adapter *adapter)
{
        return i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_GET_VF_RESOURCES,
                                  NULL, 0);
}

/**
 * i40evf_get_vf_config
 * @hw: pointer to the hardware structure
 * @len: length of buffer
 *
 * Get VF configuration from PF and populate hw structure. Must be called after
 * admin queue is initialized. Busy waits until response is received from PF,
 * with maximum timeout. Response from PF is returned in the buffer for further
 * processing by the caller.
 **/
int i40evf_get_vf_config(struct i40evf_adapter *adapter)
{
        struct i40e_hw *hw = &adapter->hw;
        struct i40e_arq_event_info event;
        u16 len;
        i40e_status err;

        len =  sizeof(struct i40e_virtchnl_vf_resource) +
                I40E_MAX_VF_VSI * sizeof(struct i40e_virtchnl_vsi_resource);
        event.msg_size = len;
        event.msg_buf = kzalloc(event.msg_size, GFP_KERNEL);
        if (!event.msg_buf) {
                err = -ENOMEM;
                goto out;
        }

        err = i40evf_clean_arq_element(hw, &event, NULL);
        if (err == I40E_ERR_ADMIN_QUEUE_NO_WORK)
                goto out_alloc;

        err = (i40e_status)le32_to_cpu(event.desc.cookie_low);
        if (err) {
                dev_err(&adapter->pdev->dev,
                        "%s: Error returned from PF, %d, %d\n", __func__,
                        le32_to_cpu(event.desc.cookie_high),
                        le32_to_cpu(event.desc.cookie_low));
                err = -EIO;
                goto out_alloc;
        }

        if ((enum i40e_virtchnl_ops)le32_to_cpu(event.desc.cookie_high) !=
            I40E_VIRTCHNL_OP_GET_VF_RESOURCES) {
                dev_err(&adapter->pdev->dev,
                        "%s: Invalid response from PF, %d, %d\n", __func__,
                        le32_to_cpu(event.desc.cookie_high),
                        le32_to_cpu(event.desc.cookie_low));
                err = -EIO;
                goto out_alloc;
        }
        memcpy(adapter->vf_res, event.msg_buf, min(event.msg_size, len));

        i40e_vf_parse_hw_config(hw, adapter->vf_res);
out_alloc:
        kfree(event.msg_buf);
out:
        return err;
}

/**
 * i40evf_configure_queues
 * @adapter: adapter structure
 *
 * Request that the PF set up our (previously allocated) queues.
 **/
void i40evf_configure_queues(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_vsi_queue_config_info *vqci;
        struct i40e_virtchnl_queue_pair_info *vqpi;
        int pairs = adapter->vsi_res->num_queue_pairs;
        int i, len;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_CONFIG_VSI_QUEUES;
        len = sizeof(struct i40e_virtchnl_vsi_queue_config_info) +
                       (sizeof(struct i40e_virtchnl_queue_pair_info) * pairs);
        vqci = kzalloc(len, GFP_ATOMIC);
        if (!vqci)
                return;

        vqci->vsi_id = adapter->vsi_res->vsi_id;
        vqci->num_queue_pairs = pairs;
        vqpi = vqci->qpair;
        /* Size check is not needed here - HW max is 16 queue pairs, and we
         * can fit info for 31 of them into the AQ buffer before it overflows.
         */
        for (i = 0; i < pairs; i++) {
                vqpi->txq.vsi_id = vqci->vsi_id;
                vqpi->txq.queue_id = i;
                vqpi->txq.ring_len = adapter->tx_rings[i]->count;
                vqpi->txq.dma_ring_addr = adapter->tx_rings[i]->dma;
                vqpi->txq.headwb_enabled = 1;
                vqpi->txq.dma_headwb_addr = vqpi->txq.dma_ring_addr +
                    (vqpi->txq.ring_len * sizeof(struct i40e_tx_desc));

                vqpi->rxq.vsi_id = vqci->vsi_id;
                vqpi->rxq.queue_id = i;
                vqpi->rxq.ring_len = adapter->rx_rings[i]->count;
                vqpi->rxq.dma_ring_addr = adapter->rx_rings[i]->dma;
                vqpi->rxq.max_pkt_size = adapter->netdev->mtu
                                        + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN;
                vqpi->rxq.databuffer_size = adapter->rx_rings[i]->rx_buf_len;
                vqpi++;
        }

        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_CONFIG_VSI_QUEUES,
                           (u8 *)vqci, len);
        kfree(vqci);
        adapter->aq_pending |= I40EVF_FLAG_AQ_CONFIGURE_QUEUES;
        adapter->aq_required &= ~I40EVF_FLAG_AQ_CONFIGURE_QUEUES;
}

/**
 * i40evf_enable_queues
 * @adapter: adapter structure
 *
 * Request that the PF enable all of our queues.
 **/
void i40evf_enable_queues(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_queue_select vqs;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_ENABLE_QUEUES;
        vqs.vsi_id = adapter->vsi_res->vsi_id;
        vqs.tx_queues = (1 << adapter->vsi_res->num_queue_pairs) - 1;
        vqs.rx_queues = vqs.tx_queues;
        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_ENABLE_QUEUES,
                           (u8 *)&vqs, sizeof(vqs));
        adapter->aq_pending |= I40EVF_FLAG_AQ_ENABLE_QUEUES;
        adapter->aq_required &= ~I40EVF_FLAG_AQ_ENABLE_QUEUES;
}

/**
 * i40evf_disable_queues
 * @adapter: adapter structure
 *
 * Request that the PF disable all of our queues.
 **/
void i40evf_disable_queues(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_queue_select vqs;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_DISABLE_QUEUES;
        vqs.vsi_id = adapter->vsi_res->vsi_id;
        vqs.tx_queues = (1 << adapter->vsi_res->num_queue_pairs) - 1;
        vqs.rx_queues = vqs.tx_queues;
        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_DISABLE_QUEUES,
                           (u8 *)&vqs, sizeof(vqs));
        adapter->aq_pending |= I40EVF_FLAG_AQ_DISABLE_QUEUES;
        adapter->aq_required &= ~I40EVF_FLAG_AQ_DISABLE_QUEUES;
}

/**
 * i40evf_map_queues
 * @adapter: adapter structure
 *
 * Request that the PF map queues to interrupt vectors. Misc causes, including
 * admin queue, are always mapped to vector 0.
 **/
void i40evf_map_queues(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_irq_map_info *vimi;
        int v_idx, q_vectors, len;
        struct i40e_q_vector *q_vector;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_CONFIG_IRQ_MAP;

        q_vectors = adapter->num_msix_vectors - NONQ_VECS;

        len = sizeof(struct i40e_virtchnl_irq_map_info) +
              (adapter->num_msix_vectors *
                sizeof(struct i40e_virtchnl_vector_map));
        vimi = kzalloc(len, GFP_ATOMIC);
        if (!vimi)
                return;

        vimi->num_vectors = adapter->num_msix_vectors;
        /* Queue vectors first */
        for (v_idx = 0; v_idx < q_vectors; v_idx++) {
                q_vector = adapter->q_vector[v_idx];
                vimi->vecmap[v_idx].vsi_id = adapter->vsi_res->vsi_id;
                vimi->vecmap[v_idx].vector_id = v_idx + NONQ_VECS;
                vimi->vecmap[v_idx].txq_map = q_vector->ring_mask;
                vimi->vecmap[v_idx].rxq_map = q_vector->ring_mask;
        }
        /* Misc vector last - this is only for AdminQ messages */
        vimi->vecmap[v_idx].vsi_id = adapter->vsi_res->vsi_id;
        vimi->vecmap[v_idx].vector_id = 0;
        vimi->vecmap[v_idx].txq_map = 0;
        vimi->vecmap[v_idx].rxq_map = 0;

        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_CONFIG_IRQ_MAP,
                           (u8 *)vimi, len);
        kfree(vimi);
        adapter->aq_pending |= I40EVF_FLAG_AQ_MAP_VECTORS;
        adapter->aq_required &= ~I40EVF_FLAG_AQ_MAP_VECTORS;
}

/**
 * i40evf_add_ether_addrs
 * @adapter: adapter structure
 * @addrs: the MAC address filters to add (contiguous)
 * @count: number of filters
 *
 * Request that the PF add one or more addresses to our filters.
 **/
void i40evf_add_ether_addrs(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_ether_addr_list *veal;
        int len, i = 0, count = 0;
        struct i40evf_mac_filter *f;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }
        list_for_each_entry(f, &adapter->mac_filter_list, list) {
                if (f->add)
                        count++;
        }
        if (!count) {
                adapter->aq_required &= ~I40EVF_FLAG_AQ_ADD_MAC_FILTER;
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_ADD_ETHER_ADDRESS;

        len = sizeof(struct i40e_virtchnl_ether_addr_list) +
              (count * sizeof(struct i40e_virtchnl_ether_addr));
        if (len > I40EVF_MAX_AQ_BUF_SIZE) {
                dev_warn(&adapter->pdev->dev, "%s: Too many MAC address changes in one request\n",
                        __func__);
                count = (I40EVF_MAX_AQ_BUF_SIZE -
                         sizeof(struct i40e_virtchnl_ether_addr_list)) /
                        sizeof(struct i40e_virtchnl_ether_addr);
                len = I40EVF_MAX_AQ_BUF_SIZE;
        }

        veal = kzalloc(len, GFP_ATOMIC);
        if (!veal)
                return;

        veal->vsi_id = adapter->vsi_res->vsi_id;
        veal->num_elements = count;
        list_for_each_entry(f, &adapter->mac_filter_list, list) {
                if (f->add) {
                        ether_addr_copy(veal->list[i].addr, f->macaddr);
                        i++;
                        f->add = false;
                }
        }
        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_ADD_ETHER_ADDRESS,
                           (u8 *)veal, len);
        kfree(veal);
        adapter->aq_pending |= I40EVF_FLAG_AQ_ADD_MAC_FILTER;
        adapter->aq_required &= ~I40EVF_FLAG_AQ_ADD_MAC_FILTER;

}

/**
 * i40evf_del_ether_addrs
 * @adapter: adapter structure
 * @addrs: the MAC address filters to remove (contiguous)
 * @count: number of filtes
 *
 * Request that the PF remove one or more addresses from our filters.
 **/
void i40evf_del_ether_addrs(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_ether_addr_list *veal;
        struct i40evf_mac_filter *f, *ftmp;
        int len, i = 0, count = 0;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }
        list_for_each_entry(f, &adapter->mac_filter_list, list) {
                if (f->remove)
                        count++;
        }
        if (!count) {
                adapter->aq_required &= ~I40EVF_FLAG_AQ_DEL_MAC_FILTER;
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_DEL_ETHER_ADDRESS;

        len = sizeof(struct i40e_virtchnl_ether_addr_list) +
              (count * sizeof(struct i40e_virtchnl_ether_addr));
        if (len > I40EVF_MAX_AQ_BUF_SIZE) {
                dev_warn(&adapter->pdev->dev, "%s: Too many MAC address changes in one request\n",
                        __func__);
                count = (I40EVF_MAX_AQ_BUF_SIZE -
                         sizeof(struct i40e_virtchnl_ether_addr_list)) /
                        sizeof(struct i40e_virtchnl_ether_addr);
                len = I40EVF_MAX_AQ_BUF_SIZE;
        }
        veal = kzalloc(len, GFP_ATOMIC);
        if (!veal)
                return;

        veal->vsi_id = adapter->vsi_res->vsi_id;
        veal->num_elements = count;
        list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list, list) {
                if (f->remove) {
                        ether_addr_copy(veal->list[i].addr, f->macaddr);
                        i++;
                        list_del(&f->list);
                        kfree(f);
                }
        }
        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_DEL_ETHER_ADDRESS,
                           (u8 *)veal, len);
        kfree(veal);
        adapter->aq_pending |= I40EVF_FLAG_AQ_DEL_MAC_FILTER;
        adapter->aq_required &= ~I40EVF_FLAG_AQ_DEL_MAC_FILTER;
}

/**
 * i40evf_add_vlans
 * @adapter: adapter structure
 * @vlans: the VLANs to add
 * @count: number of VLANs
 *
 * Request that the PF add one or more VLAN filters to our VSI.
 **/
void i40evf_add_vlans(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_vlan_filter_list *vvfl;
        int len, i = 0, count = 0;
        struct i40evf_vlan_filter *f;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }

        list_for_each_entry(f, &adapter->vlan_filter_list, list) {
                if (f->add)
                        count++;
        }
        if (!count) {
                adapter->aq_required &= ~I40EVF_FLAG_AQ_ADD_VLAN_FILTER;
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_ADD_VLAN;

        len = sizeof(struct i40e_virtchnl_vlan_filter_list) +
              (count * sizeof(u16));
        if (len > I40EVF_MAX_AQ_BUF_SIZE) {
                dev_warn(&adapter->pdev->dev, "%s: Too many VLAN changes in one request\n",
                        __func__);
                count = (I40EVF_MAX_AQ_BUF_SIZE -
                         sizeof(struct i40e_virtchnl_vlan_filter_list)) /
                        sizeof(u16);
                len = I40EVF_MAX_AQ_BUF_SIZE;
        }
        vvfl = kzalloc(len, GFP_ATOMIC);
        if (!vvfl)
                return;

        vvfl->vsi_id = adapter->vsi_res->vsi_id;
        vvfl->num_elements = count;
        list_for_each_entry(f, &adapter->vlan_filter_list, list) {
                if (f->add) {
                        vvfl->vlan_id[i] = f->vlan;
                        i++;
                        f->add = false;
                }
        }
        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_ADD_VLAN, (u8 *)vvfl, len);
        kfree(vvfl);
        adapter->aq_pending |= I40EVF_FLAG_AQ_ADD_VLAN_FILTER;
        adapter->aq_required &= ~I40EVF_FLAG_AQ_ADD_VLAN_FILTER;
}

/**
 * i40evf_del_vlans
 * @adapter: adapter structure
 * @vlans: the VLANs to remove
 * @count: number of VLANs
 *
 * Request that the PF remove one or more VLAN filters from our VSI.
 **/
void i40evf_del_vlans(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_vlan_filter_list *vvfl;
        struct i40evf_vlan_filter *f, *ftmp;
        int len, i = 0, count = 0;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }

        list_for_each_entry(f, &adapter->vlan_filter_list, list) {
                if (f->remove)
                        count++;
        }
        if (!count) {
                adapter->aq_required &= ~I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_DEL_VLAN;

        len = sizeof(struct i40e_virtchnl_vlan_filter_list) +
              (count * sizeof(u16));
        if (len > I40EVF_MAX_AQ_BUF_SIZE) {
                dev_warn(&adapter->pdev->dev, "%s: Too many VLAN changes in one request\n",
                        __func__);
                count = (I40EVF_MAX_AQ_BUF_SIZE -
                         sizeof(struct i40e_virtchnl_vlan_filter_list)) /
                        sizeof(u16);
                len = I40EVF_MAX_AQ_BUF_SIZE;
        }
        vvfl = kzalloc(len, GFP_ATOMIC);
        if (!vvfl)
                return;

        vvfl->vsi_id = adapter->vsi_res->vsi_id;
        vvfl->num_elements = count;
        list_for_each_entry_safe(f, ftmp, &adapter->vlan_filter_list, list) {
                if (f->remove) {
                        vvfl->vlan_id[i] = f->vlan;
                        i++;
                        list_del(&f->list);
                        kfree(f);
                }
        }
        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_DEL_VLAN, (u8 *)vvfl, len);
        kfree(vvfl);
        adapter->aq_pending |= I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
        adapter->aq_required &= ~I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
}

/**
 * i40evf_set_promiscuous
 * @adapter: adapter structure
 * @flags: bitmask to control unicast/multicast promiscuous.
 *
 * Request that the PF enable promiscuous mode for our VSI.
 **/
void i40evf_set_promiscuous(struct i40evf_adapter *adapter, int flags)
{
        struct i40e_virtchnl_promisc_info vpi;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "%s: command %d pending\n",
                        __func__, adapter->current_op);
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_CONFIG_PROMISCUOUS_MODE;
        vpi.vsi_id = adapter->vsi_res->vsi_id;
        vpi.flags = flags;
        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_CONFIG_PROMISCUOUS_MODE,
                           (u8 *)&vpi, sizeof(vpi));
}

/**
 * i40evf_request_stats
 * @adapter: adapter structure
 *
 * Request VSI statistics from PF.
 **/
void i40evf_request_stats(struct i40evf_adapter *adapter)
{
        struct i40e_virtchnl_queue_select vqs;
        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* no error message, this isn't crucial */
                return;
        }
        adapter->current_op = I40E_VIRTCHNL_OP_GET_STATS;
        vqs.vsi_id = adapter->vsi_res->vsi_id;
        /* queue maps are ignored for this message - only the vsi is used */
        if (i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_GET_STATS,
                               (u8 *)&vqs, sizeof(vqs)))
                /* if the request failed, don't lock out others */
                adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
}
/**
 * i40evf_request_reset
 * @adapter: adapter structure
 *
 * Request that the PF reset this VF. No response is expected.
 **/
void i40evf_request_reset(struct i40evf_adapter *adapter)
{
        /* Don't check CURRENT_OP - this is always higher priority */
        i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_RESET_VF, NULL, 0);
        adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
}

/**
 * i40evf_virtchnl_completion
 * @adapter: adapter structure
 * @v_opcode: opcode sent by PF
 * @v_retval: retval sent by PF
 * @msg: message sent by PF
 * @msglen: message length
 *
 * Asynchronous completion function for admin queue messages. Rather than busy
 * wait, we fire off our requests and assume that no errors will be returned.
 * This function handles the reply messages.
 **/
void i40evf_virtchnl_completion(struct i40evf_adapter *adapter,
                                enum i40e_virtchnl_ops v_opcode,
                                i40e_status v_retval,
                                u8 *msg, u16 msglen)
{
        struct net_device *netdev = adapter->netdev;

        if (v_opcode == I40E_VIRTCHNL_OP_EVENT) {
                struct i40e_virtchnl_pf_event *vpe =
                        (struct i40e_virtchnl_pf_event *)msg;
                switch (vpe->event) {
                case I40E_VIRTCHNL_EVENT_LINK_CHANGE:
                        adapter->link_up =
                                vpe->event_data.link_event.link_status;
                        if (adapter->link_up && !netif_carrier_ok(netdev)) {
                                dev_info(&adapter->pdev->dev, "NIC Link is Up\n");
                                netif_carrier_on(netdev);
                                netif_tx_wake_all_queues(netdev);
                        } else if (!adapter->link_up) {
                                dev_info(&adapter->pdev->dev, "NIC Link is Down\n");
                                netif_carrier_off(netdev);
                                netif_tx_stop_all_queues(netdev);
                        }
                        break;
                case I40E_VIRTCHNL_EVENT_RESET_IMPENDING:
                        dev_info(&adapter->pdev->dev, "PF reset warning received\n");
                        if (!(adapter->flags & I40EVF_FLAG_RESET_PENDING)) {
                                adapter->flags |= I40EVF_FLAG_RESET_PENDING;
                                dev_info(&adapter->pdev->dev, "Scheduling reset task\n");
                                schedule_work(&adapter->reset_task);
                        }
                        break;
                default:
                        dev_err(&adapter->pdev->dev,
                                "%s: Unknown event %d from pf\n",
                                __func__, vpe->event);
                        break;

                }
                return;
        }
        if (v_opcode != adapter->current_op) {
                dev_err(&adapter->pdev->dev, "%s: Pending op is %d, received %d\n",
                        __func__, adapter->current_op, v_opcode);
                /* We're probably completely screwed at this point, but clear
                 * the current op and try to carry on....
                 */
                adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
                return;
        }
        if (v_retval) {
                dev_err(&adapter->pdev->dev, "%s: PF returned error %d to our request %d\n",
                        __func__, v_retval, v_opcode);
        }
        switch (v_opcode) {
        case I40E_VIRTCHNL_OP_GET_STATS: {
                struct i40e_eth_stats *stats =
                        (struct i40e_eth_stats *)msg;
                adapter->net_stats.rx_packets = stats->rx_unicast +
                                                 stats->rx_multicast +
                                                 stats->rx_broadcast;
                adapter->net_stats.tx_packets = stats->tx_unicast +
                                                 stats->tx_multicast +
                                                 stats->tx_broadcast;
                adapter->net_stats.rx_bytes = stats->rx_bytes;
                adapter->net_stats.tx_bytes = stats->tx_bytes;
                adapter->net_stats.tx_errors = stats->tx_errors;
                adapter->net_stats.rx_dropped = stats->rx_discards;
                adapter->net_stats.tx_dropped = stats->tx_discards;
                adapter->current_stats = *stats;
                }
                break;
        case I40E_VIRTCHNL_OP_ADD_ETHER_ADDRESS:
                adapter->aq_pending &= ~(I40EVF_FLAG_AQ_ADD_MAC_FILTER);
                break;
        case I40E_VIRTCHNL_OP_DEL_ETHER_ADDRESS:
                adapter->aq_pending &= ~(I40EVF_FLAG_AQ_DEL_MAC_FILTER);
                break;
        case I40E_VIRTCHNL_OP_ADD_VLAN:
                adapter->aq_pending &= ~(I40EVF_FLAG_AQ_ADD_VLAN_FILTER);
                break;
        case I40E_VIRTCHNL_OP_DEL_VLAN:
                adapter->aq_pending &= ~(I40EVF_FLAG_AQ_DEL_VLAN_FILTER);
                break;
        case I40E_VIRTCHNL_OP_ENABLE_QUEUES:
                adapter->aq_pending &= ~(I40EVF_FLAG_AQ_ENABLE_QUEUES);
                /* enable transmits */
                i40evf_irq_enable(adapter, true);
                netif_tx_start_all_queues(adapter->netdev);
                netif_carrier_on(adapter->netdev);
                break;
        case I40E_VIRTCHNL_OP_DISABLE_QUEUES:
                adapter->aq_pending &= ~(I40EVF_FLAG_AQ_DISABLE_QUEUES);
                break;
        case I40E_VIRTCHNL_OP_CONFIG_VSI_QUEUES:
                adapter->aq_pending &= ~(I40EVF_FLAG_AQ_CONFIGURE_QUEUES);
                break;
        case I40E_VIRTCHNL_OP_CONFIG_IRQ_MAP:
                adapter->aq_pending &= ~(I40EVF_FLAG_AQ_MAP_VECTORS);
                break;
        default:
                dev_warn(&adapter->pdev->dev, "%s: Received unexpected message %d from PF\n",
                        __func__, v_opcode);
                break;
        } /* switch v_opcode */
        adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
}