// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
/* QLogic qed NIC Driver
 * Copyright (c) 2015-2017  QLogic Corporation
 * Copyright (c) 2019-2020 Marvell International Ltd.
 */

#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/dma-mapping.h>
#include <linux/if_vlan.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#include <linux/workqueue.h>
#include <net/ipv6.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/qed/qed_ll2_if.h>
#include "qed.h"
#include "qed_cxt.h"
#include "qed_dev_api.h"
#include "qed_hsi.h"
#include "qed_hw.h"
#include "qed_int.h"
#include "qed_ll2.h"
#include "qed_mcp.h"
#include "qed_ooo.h"
#include "qed_reg_addr.h"
#include "qed_sp.h"
#include "qed_rdma.h"

#define QED_LL2_RX_REGISTERED(ll2)      ((ll2)->rx_queue.b_cb_registered)
#define QED_LL2_TX_REGISTERED(ll2)      ((ll2)->tx_queue.b_cb_registered)

#define QED_LL2_TX_SIZE (256)
#define QED_LL2_RX_SIZE (4096)

struct qed_cb_ll2_info {
        int rx_cnt;
        u32 rx_size;
        u8 handle;

        /* Lock protecting LL2 buffer lists in sleepless context */
        spinlock_t lock;
        struct list_head list;

        const struct qed_ll2_cb_ops *cbs;
        void *cb_cookie;
};

struct qed_ll2_buffer {
        struct list_head list;
        void *data;
        dma_addr_t phys_addr;
};

static void qed_ll2b_complete_tx_packet(void *cxt,
                                        u8 connection_handle,
                                        void *cookie,
                                        dma_addr_t first_frag_addr,
                                        bool b_last_fragment,
                                        bool b_last_packet)
{
        struct qed_hwfn *p_hwfn = cxt;
        struct qed_dev *cdev = p_hwfn->cdev;
        struct sk_buff *skb = cookie;

        /* All we need to do is release the mapping */
        dma_unmap_single(&p_hwfn->cdev->pdev->dev, first_frag_addr,
                         skb_headlen(skb), DMA_TO_DEVICE);

        if (cdev->ll2->cbs && cdev->ll2->cbs->tx_cb)
                cdev->ll2->cbs->tx_cb(cdev->ll2->cb_cookie, skb,
                                      b_last_fragment);

        dev_kfree_skb_any(skb);
}

static int qed_ll2_alloc_buffer(struct qed_dev *cdev,
                                u8 **data, dma_addr_t *phys_addr)
{
        *data = kmalloc(cdev->ll2->rx_size, GFP_ATOMIC);
        if (!(*data)) {
                DP_INFO(cdev, "Failed to allocate LL2 buffer data\n");
                return -ENOMEM;
        }

        *phys_addr = dma_map_single(&cdev->pdev->dev,
                                    ((*data) + NET_SKB_PAD),
                                    cdev->ll2->rx_size, DMA_FROM_DEVICE);
        if (dma_mapping_error(&cdev->pdev->dev, *phys_addr)) {
                DP_INFO(cdev, "Failed to map LL2 buffer data\n");
                kfree((*data));
                return -ENOMEM;
        }

        return 0;
}

static int qed_ll2_dealloc_buffer(struct qed_dev *cdev,
                                 struct qed_ll2_buffer *buffer)
{
        spin_lock_bh(&cdev->ll2->lock);

        dma_unmap_single(&cdev->pdev->dev, buffer->phys_addr,
                         cdev->ll2->rx_size, DMA_FROM_DEVICE);
        kfree(buffer->data);
        list_del(&buffer->list);

        cdev->ll2->rx_cnt--;
        if (!cdev->ll2->rx_cnt)
                DP_INFO(cdev, "All LL2 entries were removed\n");

        spin_unlock_bh(&cdev->ll2->lock);

        return 0;
}

static void qed_ll2_kill_buffers(struct qed_dev *cdev)
{
        struct qed_ll2_buffer *buffer, *tmp_buffer;

        list_for_each_entry_safe(buffer, tmp_buffer, &cdev->ll2->list, list)
                qed_ll2_dealloc_buffer(cdev, buffer);
}

static void qed_ll2b_complete_rx_packet(void *cxt,
                                        struct qed_ll2_comp_rx_data *data)
{
        struct qed_hwfn *p_hwfn = cxt;
        struct qed_ll2_buffer *buffer = data->cookie;
        struct qed_dev *cdev = p_hwfn->cdev;
        dma_addr_t new_phys_addr;
        struct sk_buff *skb;
        bool reuse = false;
        int rc = -EINVAL;
        u8 *new_data;

        DP_VERBOSE(p_hwfn,
                   (NETIF_MSG_RX_STATUS | QED_MSG_STORAGE | NETIF_MSG_PKTDATA),
                   "Got an LL2 Rx completion: [Buffer at phys 0x%llx, offset 0x%02x] Length 0x%04x Parse_flags 0x%04x vlan 0x%04x Opaque data [0x%08x:0x%08x]\n",
                   (u64)data->rx_buf_addr,
                   data->u.placement_offset,
                   data->length.packet_length,
                   data->parse_flags,
                   data->vlan, data->opaque_data_0, data->opaque_data_1);

        if ((cdev->dp_module & NETIF_MSG_PKTDATA) && buffer->data) {
                print_hex_dump(KERN_INFO, "",
                               DUMP_PREFIX_OFFSET, 16, 1,
                               buffer->data, data->length.packet_length, false);
        }

        /* Determine if data is valid */
        if (data->length.packet_length < ETH_HLEN)
                reuse = true;

        /* Allocate a replacement for buffer; Reuse upon failure */
        if (!reuse)
                rc = qed_ll2_alloc_buffer(p_hwfn->cdev, &new_data,
                                          &new_phys_addr);

        /* If need to reuse or there's no replacement buffer, repost this */
        if (rc)
                goto out_post;
        dma_unmap_single(&cdev->pdev->dev, buffer->phys_addr,
                         cdev->ll2->rx_size, DMA_FROM_DEVICE);

        skb = build_skb(buffer->data, 0);
        if (!skb) {
                DP_INFO(cdev, "Failed to build SKB\n");
                kfree(buffer->data);
                goto out_post1;
        }

        data->u.placement_offset += NET_SKB_PAD;
        skb_reserve(skb, data->u.placement_offset);
        skb_put(skb, data->length.packet_length);
        skb_checksum_none_assert(skb);

        /* Get parital ethernet information instead of eth_type_trans(),
         * Since we don't have an associated net_device.
         */
        skb_reset_mac_header(skb);
        skb->protocol = eth_hdr(skb)->h_proto;

        /* Pass SKB onward */
        if (cdev->ll2->cbs && cdev->ll2->cbs->rx_cb) {
                if (data->vlan)
                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                               data->vlan);
                cdev->ll2->cbs->rx_cb(cdev->ll2->cb_cookie, skb,
                                      data->opaque_data_0,
                                      data->opaque_data_1);
        } else {
                DP_VERBOSE(p_hwfn, (NETIF_MSG_RX_STATUS | NETIF_MSG_PKTDATA |
                                    QED_MSG_LL2 | QED_MSG_STORAGE),
                           "Dropping the packet\n");
                kfree(buffer->data);
        }

out_post1:
        /* Update Buffer information and update FW producer */
        buffer->data = new_data;
        buffer->phys_addr = new_phys_addr;

out_post:
        rc = qed_ll2_post_rx_buffer(p_hwfn, cdev->ll2->handle,
                                    buffer->phys_addr, 0, buffer, 1);
        if (rc)
                qed_ll2_dealloc_buffer(cdev, buffer);
}

static struct qed_ll2_info *__qed_ll2_handle_sanity(struct qed_hwfn *p_hwfn,
                                                    u8 connection_handle,
                                                    bool b_lock,
                                                    bool b_only_active)
{
        struct qed_ll2_info *p_ll2_conn, *p_ret = NULL;

        if (connection_handle >= QED_MAX_NUM_OF_LL2_CONNECTIONS)
                return NULL;

        if (!p_hwfn->p_ll2_info)
                return NULL;

        p_ll2_conn = &p_hwfn->p_ll2_info[connection_handle];

        if (b_only_active) {
                if (b_lock)
                        mutex_lock(&p_ll2_conn->mutex);
                if (p_ll2_conn->b_active)
                        p_ret = p_ll2_conn;
                if (b_lock)
                        mutex_unlock(&p_ll2_conn->mutex);
        } else {
                p_ret = p_ll2_conn;
        }

        return p_ret;
}

static struct qed_ll2_info *qed_ll2_handle_sanity(struct qed_hwfn *p_hwfn,
                                                  u8 connection_handle)
{
        return __qed_ll2_handle_sanity(p_hwfn, connection_handle, false, true);
}

static struct qed_ll2_info *qed_ll2_handle_sanity_lock(struct qed_hwfn *p_hwfn,
                                                       u8 connection_handle)
{
        return __qed_ll2_handle_sanity(p_hwfn, connection_handle, true, true);
}

static struct qed_ll2_info *qed_ll2_handle_sanity_inactive(struct qed_hwfn
                                                           *p_hwfn,
                                                           u8 connection_handle)
{
        return __qed_ll2_handle_sanity(p_hwfn, connection_handle, false, false);
}

static void qed_ll2_txq_flush(struct qed_hwfn *p_hwfn, u8 connection_handle)
{
        bool b_last_packet = false, b_last_frag = false;
        struct qed_ll2_tx_packet *p_pkt = NULL;
        struct qed_ll2_info *p_ll2_conn;
        struct qed_ll2_tx_queue *p_tx;
        unsigned long flags = 0;
        dma_addr_t tx_frag;

        p_ll2_conn = qed_ll2_handle_sanity_inactive(p_hwfn, connection_handle);
        if (!p_ll2_conn)
                return;

        p_tx = &p_ll2_conn->tx_queue;

        spin_lock_irqsave(&p_tx->lock, flags);
        while (!list_empty(&p_tx->active_descq)) {
                p_pkt = list_first_entry(&p_tx->active_descq,
                                         struct qed_ll2_tx_packet, list_entry);
                if (!p_pkt)
                        break;

                list_del(&p_pkt->list_entry);
                b_last_packet = list_empty(&p_tx->active_descq);
                list_add_tail(&p_pkt->list_entry, &p_tx->free_descq);
                spin_unlock_irqrestore(&p_tx->lock, flags);
                if (p_ll2_conn->input.conn_type == QED_LL2_TYPE_OOO) {
                        struct qed_ooo_buffer *p_buffer;

                        p_buffer = (struct qed_ooo_buffer *)p_pkt->cookie;
                        qed_ooo_put_free_buffer(p_hwfn, p_hwfn->p_ooo_info,
                                                p_buffer);
                } else {
                        p_tx->cur_completing_packet = *p_pkt;
                        p_tx->cur_completing_bd_idx = 1;
                        b_last_frag =
                                p_tx->cur_completing_bd_idx == p_pkt->bd_used;
                        tx_frag = p_pkt->bds_set[0].tx_frag;
                        p_ll2_conn->cbs.tx_release_cb(p_ll2_conn->cbs.cookie,
                                                      p_ll2_conn->my_id,
                                                      p_pkt->cookie,
                                                      tx_frag,
                                                      b_last_frag,
                                                      b_last_packet);
                }
                spin_lock_irqsave(&p_tx->lock, flags);
        }
        spin_unlock_irqrestore(&p_tx->lock, flags);
}

static int qed_ll2_txq_completion(struct qed_hwfn *p_hwfn, void *p_cookie)
{
        struct qed_ll2_info *p_ll2_conn = p_cookie;
        struct qed_ll2_tx_queue *p_tx = &p_ll2_conn->tx_queue;
        u16 new_idx = 0, num_bds = 0, num_bds_in_packet = 0;
        struct qed_ll2_tx_packet *p_pkt;
        bool b_last_frag = false;
        unsigned long flags;
        int rc = -EINVAL;

        if (!p_ll2_conn)
                return rc;

        spin_lock_irqsave(&p_tx->lock, flags);
        if (p_tx->b_completing_packet) {
                rc = -EBUSY;
                goto out;
        }

        new_idx = le16_to_cpu(*p_tx->p_fw_cons);
        num_bds = ((s16)new_idx - (s16)p_tx->bds_idx);
        while (num_bds) {
                if (list_empty(&p_tx->active_descq))
                        goto out;

                p_pkt = list_first_entry(&p_tx->active_descq,
                                         struct qed_ll2_tx_packet, list_entry);
                if (!p_pkt)
                        goto out;

                p_tx->b_completing_packet = true;
                p_tx->cur_completing_packet = *p_pkt;
                num_bds_in_packet = p_pkt->bd_used;
                list_del(&p_pkt->list_entry);

                if (num_bds < num_bds_in_packet) {
                        DP_NOTICE(p_hwfn,
                                  "Rest of BDs does not cover whole packet\n");
                        goto out;
                }

                num_bds -= num_bds_in_packet;
                p_tx->bds_idx += num_bds_in_packet;
                while (num_bds_in_packet--)
                        qed_chain_consume(&p_tx->txq_chain);

                p_tx->cur_completing_bd_idx = 1;
                b_last_frag = p_tx->cur_completing_bd_idx == p_pkt->bd_used;
                list_add_tail(&p_pkt->list_entry, &p_tx->free_descq);

                spin_unlock_irqrestore(&p_tx->lock, flags);

                p_ll2_conn->cbs.tx_comp_cb(p_ll2_conn->cbs.cookie,
                                           p_ll2_conn->my_id,
                                           p_pkt->cookie,
                                           p_pkt->bds_set[0].tx_frag,
                                           b_last_frag, !num_bds);

                spin_lock_irqsave(&p_tx->lock, flags);
        }

        p_tx->b_completing_packet = false;
        rc = 0;
out:
        spin_unlock_irqrestore(&p_tx->lock, flags);
        return rc;
}

static void qed_ll2_rxq_parse_gsi(struct qed_hwfn *p_hwfn,
                                  union core_rx_cqe_union *p_cqe,
                                  struct qed_ll2_comp_rx_data *data)
{
        data->parse_flags = le16_to_cpu(p_cqe->rx_cqe_gsi.parse_flags.flags);
        data->length.data_length = le16_to_cpu(p_cqe->rx_cqe_gsi.data_length);
        data->vlan = le16_to_cpu(p_cqe->rx_cqe_gsi.vlan);
        data->opaque_data_0 = le32_to_cpu(p_cqe->rx_cqe_gsi.src_mac_addrhi);
        data->opaque_data_1 = le16_to_cpu(p_cqe->rx_cqe_gsi.src_mac_addrlo);
        data->u.data_length_error = p_cqe->rx_cqe_gsi.data_length_error;
        data->qp_id = le16_to_cpu(p_cqe->rx_cqe_gsi.qp_id);

        data->src_qp = le32_to_cpu(p_cqe->rx_cqe_gsi.src_qp);
}

static void qed_ll2_rxq_parse_reg(struct qed_hwfn *p_hwfn,
                                  union core_rx_cqe_union *p_cqe,
                                  struct qed_ll2_comp_rx_data *data)
{
        data->parse_flags = le16_to_cpu(p_cqe->rx_cqe_fp.parse_flags.flags);
        data->err_flags = le16_to_cpu(p_cqe->rx_cqe_fp.err_flags.flags);
        data->length.packet_length =
            le16_to_cpu(p_cqe->rx_cqe_fp.packet_length);
        data->vlan = le16_to_cpu(p_cqe->rx_cqe_fp.vlan);
        data->opaque_data_0 = le32_to_cpu(p_cqe->rx_cqe_fp.opaque_data.data[0]);
        data->opaque_data_1 = le32_to_cpu(p_cqe->rx_cqe_fp.opaque_data.data[1]);
        data->u.placement_offset = p_cqe->rx_cqe_fp.placement_offset;
}

static int
qed_ll2_handle_slowpath(struct qed_hwfn *p_hwfn,
                        struct qed_ll2_info *p_ll2_conn,
                        union core_rx_cqe_union *p_cqe,
                        unsigned long *p_lock_flags)
{
        struct qed_ll2_rx_queue *p_rx = &p_ll2_conn->rx_queue;
        struct core_rx_slow_path_cqe *sp_cqe;

        sp_cqe = &p_cqe->rx_cqe_sp;
        if (sp_cqe->ramrod_cmd_id != CORE_RAMROD_RX_QUEUE_FLUSH) {
                DP_NOTICE(p_hwfn,
                          "LL2 - unexpected Rx CQE slowpath ramrod_cmd_id:%d\n",
                          sp_cqe->ramrod_cmd_id);
                return -EINVAL;
        }

        if (!p_ll2_conn->cbs.slowpath_cb) {
                DP_NOTICE(p_hwfn,
                          "LL2 - received RX_QUEUE_FLUSH but no callback was provided\n");
                return -EINVAL;
        }

        spin_unlock_irqrestore(&p_rx->lock, *p_lock_flags);

        p_ll2_conn->cbs.slowpath_cb(p_ll2_conn->cbs.cookie,
                                    p_ll2_conn->my_id,
                                    le32_to_cpu(sp_cqe->opaque_data.data[0]),
                                    le32_to_cpu(sp_cqe->opaque_data.data[1]));

        spin_lock_irqsave(&p_rx->lock, *p_lock_flags);

        return 0;
}

static int
qed_ll2_rxq_handle_completion(struct qed_hwfn *p_hwfn,
                              struct qed_ll2_info *p_ll2_conn,
                              union core_rx_cqe_union *p_cqe,
                              unsigned long *p_lock_flags, bool b_last_cqe)
{
        struct qed_ll2_rx_queue *p_rx = &p_ll2_conn->rx_queue;
        struct qed_ll2_rx_packet *p_pkt = NULL;
        struct qed_ll2_comp_rx_data data;

        if (!list_empty(&p_rx->active_descq))
                p_pkt = list_first_entry(&p_rx->active_descq,
                                         struct qed_ll2_rx_packet, list_entry);
        if (!p_pkt) {
                DP_NOTICE(p_hwfn,
                          "[%d] LL2 Rx completion but active_descq is empty\n",
                          p_ll2_conn->input.conn_type);

                return -EIO;
        }
        list_del(&p_pkt->list_entry);

        if (p_cqe->rx_cqe_sp.type == CORE_RX_CQE_TYPE_REGULAR)
                qed_ll2_rxq_parse_reg(p_hwfn, p_cqe, &data);
        else
                qed_ll2_rxq_parse_gsi(p_hwfn, p_cqe, &data);
        if (qed_chain_consume(&p_rx->rxq_chain) != p_pkt->rxq_bd)
                DP_NOTICE(p_hwfn,
                          "Mismatch between active_descq and the LL2 Rx chain\n");

        list_add_tail(&p_pkt->list_entry, &p_rx->free_descq);

        data.connection_handle = p_ll2_conn->my_id;
        data.cookie = p_pkt->cookie;
        data.rx_buf_addr = p_pkt->rx_buf_addr;
        data.b_last_packet = b_last_cqe;

        spin_unlock_irqrestore(&p_rx->lock, *p_lock_flags);
        p_ll2_conn->cbs.rx_comp_cb(p_ll2_conn->cbs.cookie, &data);

        spin_lock_irqsave(&p_rx->lock, *p_lock_flags);

        return 0;
}

static int qed_ll2_rxq_completion(struct qed_hwfn *p_hwfn, void *cookie)
{
        struct qed_ll2_info *p_ll2_conn = (struct qed_ll2_info *)cookie;
        struct qed_ll2_rx_queue *p_rx = &p_ll2_conn->rx_queue;
        union core_rx_cqe_union *cqe = NULL;
        u16 cq_new_idx = 0, cq_old_idx = 0;
        unsigned long flags = 0;
        int rc = 0;

        if (!p_ll2_conn)
                return rc;

        spin_lock_irqsave(&p_rx->lock, flags);

        if (!QED_LL2_RX_REGISTERED(p_ll2_conn)) {
                spin_unlock_irqrestore(&p_rx->lock, flags);
                return 0;
        }

        cq_new_idx = le16_to_cpu(*p_rx->p_fw_cons);
        cq_old_idx = qed_chain_get_cons_idx(&p_rx->rcq_chain);

        while (cq_new_idx != cq_old_idx) {
                bool b_last_cqe = (cq_new_idx == cq_old_idx);

                cqe =
                    (union core_rx_cqe_union *)
                    qed_chain_consume(&p_rx->rcq_chain);
                cq_old_idx = qed_chain_get_cons_idx(&p_rx->rcq_chain);

                DP_VERBOSE(p_hwfn,
                           QED_MSG_LL2,
                           "LL2 [sw. cons %04x, fw. at %04x] - Got Packet of type %02x\n",
                           cq_old_idx, cq_new_idx, cqe->rx_cqe_sp.type);

                switch (cqe->rx_cqe_sp.type) {
                case CORE_RX_CQE_TYPE_SLOW_PATH:
                        rc = qed_ll2_handle_slowpath(p_hwfn, p_ll2_conn,
                                                     cqe, &flags);
                        break;
                case CORE_RX_CQE_TYPE_GSI_OFFLOAD:
                case CORE_RX_CQE_TYPE_REGULAR:
                        rc = qed_ll2_rxq_handle_completion(p_hwfn, p_ll2_conn,
                                                           cqe, &flags,
                                                           b_last_cqe);
                        break;
                default:
                        rc = -EIO;
                }
        }

        spin_unlock_irqrestore(&p_rx->lock, flags);
        return rc;
}

static void qed_ll2_rxq_flush(struct qed_hwfn *p_hwfn, u8 connection_handle)
{
        struct qed_ll2_info *p_ll2_conn = NULL;
        struct qed_ll2_rx_packet *p_pkt = NULL;
        struct qed_ll2_rx_queue *p_rx;
        unsigned long flags = 0;

        p_ll2_conn = qed_ll2_handle_sanity_inactive(p_hwfn, connection_handle);
        if (!p_ll2_conn)
                return;

        p_rx = &p_ll2_conn->rx_queue;

        spin_lock_irqsave(&p_rx->lock, flags);
        while (!list_empty(&p_rx->active_descq)) {
                p_pkt = list_first_entry(&p_rx->active_descq,
                                         struct qed_ll2_rx_packet, list_entry);
                if (!p_pkt)
                        break;
                list_move_tail(&p_pkt->list_entry, &p_rx->free_descq);
                spin_unlock_irqrestore(&p_rx->lock, flags);

                if (p_ll2_conn->input.conn_type == QED_LL2_TYPE_OOO) {
                        struct qed_ooo_buffer *p_buffer;

                        p_buffer = (struct qed_ooo_buffer *)p_pkt->cookie;
                        qed_ooo_put_free_buffer(p_hwfn, p_hwfn->p_ooo_info,
                                                p_buffer);
                } else {
                        dma_addr_t rx_buf_addr = p_pkt->rx_buf_addr;
                        void *cookie = p_pkt->cookie;
                        bool b_last;

                        b_last = list_empty(&p_rx->active_descq);
                        p_ll2_conn->cbs.rx_release_cb(p_ll2_conn->cbs.cookie,
                                                      p_ll2_conn->my_id,
                                                      cookie,
                                                      rx_buf_addr, b_last);
                }
                spin_lock_irqsave(&p_rx->lock, flags);
        }
        spin_unlock_irqrestore(&p_rx->lock, flags);
}

static bool
qed_ll2_lb_rxq_handler_slowpath(struct qed_hwfn *p_hwfn,
                                struct core_rx_slow_path_cqe *p_cqe)
{
        struct ooo_opaque *iscsi_ooo;
        u32 cid;

        if (p_cqe->ramrod_cmd_id != CORE_RAMROD_RX_QUEUE_FLUSH)
                return false;

        iscsi_ooo = (struct ooo_opaque *)&p_cqe->opaque_data;
        if (iscsi_ooo->ooo_opcode != TCP_EVENT_DELETE_ISLES)
                return false;

        /* Need to make a flush */
        cid = le32_to_cpu(iscsi_ooo->cid);
        qed_ooo_release_connection_isles(p_hwfn, p_hwfn->p_ooo_info, cid);

        return true;
}

static int qed_ll2_lb_rxq_handler(struct qed_hwfn *p_hwfn,
                                  struct qed_ll2_info *p_ll2_conn)
{
        struct qed_ll2_rx_queue *p_rx = &p_ll2_conn->rx_queue;
        u16 packet_length = 0, parse_flags = 0, vlan = 0;
        struct qed_ll2_rx_packet *p_pkt = NULL;
        u32 num_ooo_add_to_peninsula = 0, cid;
        union core_rx_cqe_union *cqe = NULL;
        u16 cq_new_idx = 0, cq_old_idx = 0;
        struct qed_ooo_buffer *p_buffer;
        struct ooo_opaque *iscsi_ooo;
        u8 placement_offset = 0;
        u8 cqe_type;

        cq_new_idx = le16_to_cpu(*p_rx->p_fw_cons);
        cq_old_idx = qed_chain_get_cons_idx(&p_rx->rcq_chain);
        if (cq_new_idx == cq_old_idx)
                return 0;

        while (cq_new_idx != cq_old_idx) {
                struct core_rx_fast_path_cqe *p_cqe_fp;

                cqe = qed_chain_consume(&p_rx->rcq_chain);
                cq_old_idx = qed_chain_get_cons_idx(&p_rx->rcq_chain);
                cqe_type = cqe->rx_cqe_sp.type;

                if (cqe_type == CORE_RX_CQE_TYPE_SLOW_PATH)
                        if (qed_ll2_lb_rxq_handler_slowpath(p_hwfn,
                                                            &cqe->rx_cqe_sp))
                                continue;

                if (cqe_type != CORE_RX_CQE_TYPE_REGULAR) {
                        DP_NOTICE(p_hwfn,
                                  "Got a non-regular LB LL2 completion [type 0x%02x]\n",
                                  cqe_type);
                        return -EINVAL;
                }
                p_cqe_fp = &cqe->rx_cqe_fp;

                placement_offset = p_cqe_fp->placement_offset;
                parse_flags = le16_to_cpu(p_cqe_fp->parse_flags.flags);
                packet_length = le16_to_cpu(p_cqe_fp->packet_length);
                vlan = le16_to_cpu(p_cqe_fp->vlan);
                iscsi_ooo = (struct ooo_opaque *)&p_cqe_fp->opaque_data;
                qed_ooo_save_history_entry(p_hwfn, p_hwfn->p_ooo_info,
                                           iscsi_ooo);
                cid = le32_to_cpu(iscsi_ooo->cid);

                /* Process delete isle first */
                if (iscsi_ooo->drop_size)
                        qed_ooo_delete_isles(p_hwfn, p_hwfn->p_ooo_info, cid,
                                             iscsi_ooo->drop_isle,
                                             iscsi_ooo->drop_size);

                if (iscsi_ooo->ooo_opcode == TCP_EVENT_NOP)
                        continue;

                /* Now process create/add/join isles */
                if (list_empty(&p_rx->active_descq)) {
                        DP_NOTICE(p_hwfn,
                                  "LL2 OOO RX chain has no submitted buffers\n"
                                  );
                        return -EIO;
                }

                p_pkt = list_first_entry(&p_rx->active_descq,
                                         struct qed_ll2_rx_packet, list_entry);

                if ((iscsi_ooo->ooo_opcode == TCP_EVENT_ADD_NEW_ISLE) ||
                    (iscsi_ooo->ooo_opcode == TCP_EVENT_ADD_ISLE_RIGHT) ||
                    (iscsi_ooo->ooo_opcode == TCP_EVENT_ADD_ISLE_LEFT) ||
                    (iscsi_ooo->ooo_opcode == TCP_EVENT_ADD_PEN) ||
                    (iscsi_ooo->ooo_opcode == TCP_EVENT_JOIN)) {
                        if (!p_pkt) {
                                DP_NOTICE(p_hwfn,
                                          "LL2 OOO RX packet is not valid\n");
                                return -EIO;
                        }
                        list_del(&p_pkt->list_entry);
                        p_buffer = (struct qed_ooo_buffer *)p_pkt->cookie;
                        p_buffer->packet_length = packet_length;
                        p_buffer->parse_flags = parse_flags;
                        p_buffer->vlan = vlan;
                        p_buffer->placement_offset = placement_offset;
                        qed_chain_consume(&p_rx->rxq_chain);
                        list_add_tail(&p_pkt->list_entry, &p_rx->free_descq);

                        switch (iscsi_ooo->ooo_opcode) {
                        case TCP_EVENT_ADD_NEW_ISLE:
                                qed_ooo_add_new_isle(p_hwfn,
                                                     p_hwfn->p_ooo_info,
                                                     cid,
                                                     iscsi_ooo->ooo_isle,
                                                     p_buffer);
                                break;
                        case TCP_EVENT_ADD_ISLE_RIGHT:
                                qed_ooo_add_new_buffer(p_hwfn,
                                                       p_hwfn->p_ooo_info,
                                                       cid,
                                                       iscsi_ooo->ooo_isle,
                                                       p_buffer,
                                                       QED_OOO_RIGHT_BUF);
                                break;
                        case TCP_EVENT_ADD_ISLE_LEFT:
                                qed_ooo_add_new_buffer(p_hwfn,
                                                       p_hwfn->p_ooo_info,
                                                       cid,
                                                       iscsi_ooo->ooo_isle,
                                                       p_buffer,
                                                       QED_OOO_LEFT_BUF);
                                break;
                        case TCP_EVENT_JOIN:
                                qed_ooo_add_new_buffer(p_hwfn,
                                                       p_hwfn->p_ooo_info,
                                                       cid,
                                                       iscsi_ooo->ooo_isle +
                                                       1,
                                                       p_buffer,
                                                       QED_OOO_LEFT_BUF);
                                qed_ooo_join_isles(p_hwfn,
                                                   p_hwfn->p_ooo_info,
                                                   cid, iscsi_ooo->ooo_isle);
                                break;
                        case TCP_EVENT_ADD_PEN:
                                num_ooo_add_to_peninsula++;
                                qed_ooo_put_ready_buffer(p_hwfn,
                                                         p_hwfn->p_ooo_info,
                                                         p_buffer, true);
                                break;
                        }
                } else {
                        DP_NOTICE(p_hwfn,
                                  "Unexpected event (%d) TX OOO completion\n",
                                  iscsi_ooo->ooo_opcode);
                }
        }

        return 0;
}

static void
qed_ooo_submit_tx_buffers(struct qed_hwfn *p_hwfn,
                          struct qed_ll2_info *p_ll2_conn)
{
        struct qed_ll2_tx_pkt_info tx_pkt;
        struct qed_ooo_buffer *p_buffer;
        u16 l4_hdr_offset_w;
        dma_addr_t first_frag;
        u8 bd_flags;
        int rc;

        /* Submit Tx buffers here */
        while ((p_buffer = qed_ooo_get_ready_buffer(p_hwfn,
                                                    p_hwfn->p_ooo_info))) {
                l4_hdr_offset_w = 0;
                bd_flags = 0;

                first_frag = p_buffer->rx_buffer_phys_addr +
                             p_buffer->placement_offset;
                SET_FIELD(bd_flags, CORE_TX_BD_DATA_FORCE_VLAN_MODE, 1);
                SET_FIELD(bd_flags, CORE_TX_BD_DATA_L4_PROTOCOL, 1);

                memset(&tx_pkt, 0, sizeof(tx_pkt));
                tx_pkt.num_of_bds = 1;
                tx_pkt.vlan = p_buffer->vlan;
                tx_pkt.bd_flags = bd_flags;
                tx_pkt.l4_hdr_offset_w = l4_hdr_offset_w;
                switch (p_ll2_conn->tx_dest) {
                case CORE_TX_DEST_NW:
                        tx_pkt.tx_dest = QED_LL2_TX_DEST_NW;
                        break;
                case CORE_TX_DEST_LB:
                        tx_pkt.tx_dest = QED_LL2_TX_DEST_LB;
                        break;
                case CORE_TX_DEST_DROP:
                default:
                        tx_pkt.tx_dest = QED_LL2_TX_DEST_DROP;
                        break;
                }
                tx_pkt.first_frag = first_frag;
                tx_pkt.first_frag_len = p_buffer->packet_length;
                tx_pkt.cookie = p_buffer;

                rc = qed_ll2_prepare_tx_packet(p_hwfn, p_ll2_conn->my_id,
                                               &tx_pkt, true);
                if (rc) {
                        qed_ooo_put_ready_buffer(p_hwfn, p_hwfn->p_ooo_info,
                                                 p_buffer, false);
                        break;
                }
        }
}

static void
qed_ooo_submit_rx_buffers(struct qed_hwfn *p_hwfn,
                          struct qed_ll2_info *p_ll2_conn)
{
        struct qed_ooo_buffer *p_buffer;
        int rc;

        while ((p_buffer = qed_ooo_get_free_buffer(p_hwfn,
                                                   p_hwfn->p_ooo_info))) {
                rc = qed_ll2_post_rx_buffer(p_hwfn,
                                            p_ll2_conn->my_id,
                                            p_buffer->rx_buffer_phys_addr,
                                            0, p_buffer, true);
                if (rc) {
                        qed_ooo_put_free_buffer(p_hwfn,
                                                p_hwfn->p_ooo_info, p_buffer);
                        break;
                }
        }
}

static int qed_ll2_lb_rxq_completion(struct qed_hwfn *p_hwfn, void *p_cookie)
{
        struct qed_ll2_info *p_ll2_conn = (struct qed_ll2_info *)p_cookie;
        int rc;

        if (!p_ll2_conn)
                return 0;

        if (!QED_LL2_RX_REGISTERED(p_ll2_conn))
                return 0;

        rc = qed_ll2_lb_rxq_handler(p_hwfn, p_ll2_conn);
        if (rc)
                return rc;

        qed_ooo_submit_rx_buffers(p_hwfn, p_ll2_conn);
        qed_ooo_submit_tx_buffers(p_hwfn, p_ll2_conn);

        return 0;
}

static int qed_ll2_lb_txq_completion(struct qed_hwfn *p_hwfn, void *p_cookie)
{
        struct qed_ll2_info *p_ll2_conn = (struct qed_ll2_info *)p_cookie;
        struct qed_ll2_tx_queue *p_tx = &p_ll2_conn->tx_queue;
        struct qed_ll2_tx_packet *p_pkt = NULL;
        struct qed_ooo_buffer *p_buffer;
        bool b_dont_submit_rx = false;
        u16 new_idx = 0, num_bds = 0;
        int rc;

        if (!p_ll2_conn)
                return 0;

        if (!QED_LL2_TX_REGISTERED(p_ll2_conn))
                return 0;

        new_idx = le16_to_cpu(*p_tx->p_fw_cons);
        num_bds = ((s16)new_idx - (s16)p_tx->bds_idx);

        if (!num_bds)
                return 0;

        while (num_bds) {
                if (list_empty(&p_tx->active_descq))
                        return -EINVAL;

                p_pkt = list_first_entry(&p_tx->active_descq,
                                         struct qed_ll2_tx_packet, list_entry);
                if (!p_pkt)
                        return -EINVAL;

                if (p_pkt->bd_used != 1) {
                        DP_NOTICE(p_hwfn,
                                  "Unexpectedly many BDs(%d) in TX OOO completion\n",
                                  p_pkt->bd_used);
                        return -EINVAL;
                }

                list_del(&p_pkt->list_entry);

                num_bds--;
                p_tx->bds_idx++;
                qed_chain_consume(&p_tx->txq_chain);

                p_buffer = (struct qed_ooo_buffer *)p_pkt->cookie;
                list_add_tail(&p_pkt->list_entry, &p_tx->free_descq);

                if (b_dont_submit_rx) {
                        qed_ooo_put_free_buffer(p_hwfn, p_hwfn->p_ooo_info,
                                                p_buffer);
                        continue;
                }

                rc = qed_ll2_post_rx_buffer(p_hwfn, p_ll2_conn->my_id,
                                            p_buffer->rx_buffer_phys_addr, 0,
                                            p_buffer, true);
                if (rc != 0) {
                        qed_ooo_put_free_buffer(p_hwfn,
                                                p_hwfn->p_ooo_info, p_buffer);
                        b_dont_submit_rx = true;
                }
        }

        qed_ooo_submit_tx_buffers(p_hwfn, p_ll2_conn);

        return 0;
}

static void qed_ll2_stop_ooo(struct qed_hwfn *p_hwfn)
{
        u8 *handle = &p_hwfn->pf_params.iscsi_pf_params.ll2_ooo_queue_id;

        DP_VERBOSE(p_hwfn, (QED_MSG_STORAGE | QED_MSG_LL2),
                   "Stopping LL2 OOO queue [%02x]\n", *handle);

        qed_ll2_terminate_connection(p_hwfn, *handle);
        qed_ll2_release_connection(p_hwfn, *handle);
        *handle = QED_LL2_UNUSED_HANDLE;
}

static int qed_sp_ll2_rx_queue_start(struct qed_hwfn *p_hwfn,
                                     struct qed_ll2_info *p_ll2_conn,
                                     u8 action_on_error)
{
        enum qed_ll2_conn_type conn_type = p_ll2_conn->input.conn_type;
        struct qed_ll2_rx_queue *p_rx = &p_ll2_conn->rx_queue;
        struct core_rx_start_ramrod_data *p_ramrod = NULL;
        struct qed_spq_entry *p_ent = NULL;
        struct qed_sp_init_data init_data;
        u16 cqe_pbl_size;
        int rc = 0;

        /* Get SPQ entry */
        memset(&init_data, 0, sizeof(init_data));
        init_data.cid = p_ll2_conn->cid;
        init_data.opaque_fid = p_hwfn->hw_info.opaque_fid;
        init_data.comp_mode = QED_SPQ_MODE_EBLOCK;

        rc = qed_sp_init_request(p_hwfn, &p_ent,
                                 CORE_RAMROD_RX_QUEUE_START,
                                 PROTOCOLID_CORE, &init_data);
        if (rc)
                return rc;

        p_ramrod = &p_ent->ramrod.core_rx_queue_start;
        memset(p_ramrod, 0, sizeof(*p_ramrod));
        p_ramrod->sb_id = cpu_to_le16(qed_int_get_sp_sb_id(p_hwfn));
        p_ramrod->sb_index = p_rx->rx_sb_index;
        p_ramrod->complete_event_flg = 1;

        p_ramrod->mtu = cpu_to_le16(p_ll2_conn->input.mtu);
        DMA_REGPAIR_LE(p_ramrod->bd_base, p_rx->rxq_chain.p_phys_addr);
        cqe_pbl_size = (u16)qed_chain_get_page_cnt(&p_rx->rcq_chain);
        p_ramrod->num_of_pbl_pages = cpu_to_le16(cqe_pbl_size);
        DMA_REGPAIR_LE(p_ramrod->cqe_pbl_addr,
                       qed_chain_get_pbl_phys(&p_rx->rcq_chain));

        p_ramrod->drop_ttl0_flg = p_ll2_conn->input.rx_drop_ttl0_flg;
        p_ramrod->inner_vlan_stripping_en =
                p_ll2_conn->input.rx_vlan_removal_en;

        if (test_bit(QED_MF_UFP_SPECIFIC, &p_hwfn->cdev->mf_bits) &&
            p_ll2_conn->input.conn_type == QED_LL2_TYPE_FCOE)
                p_ramrod->report_outer_vlan = 1;
        p_ramrod->queue_id = p_ll2_conn->queue_id;
        p_ramrod->main_func_queue = p_ll2_conn->main_func_queue ? 1 : 0;

        if (test_bit(QED_MF_LL2_NON_UNICAST, &p_hwfn->cdev->mf_bits) &&
            p_ramrod->main_func_queue && conn_type != QED_LL2_TYPE_ROCE &&
            conn_type != QED_LL2_TYPE_IWARP) {
                p_ramrod->mf_si_bcast_accept_all = 1;
                p_ramrod->mf_si_mcast_accept_all = 1;
        } else {
                p_ramrod->mf_si_bcast_accept_all = 0;
                p_ramrod->mf_si_mcast_accept_all = 0;
        }

        p_ramrod->action_on_error.error_type = action_on_error;
        p_ramrod->gsi_offload_flag = p_ll2_conn->input.gsi_enable;
        p_ramrod->zero_prod_flg = 1;

        return qed_spq_post(p_hwfn, p_ent, NULL);
}

static int qed_sp_ll2_tx_queue_start(struct qed_hwfn *p_hwfn,
                                     struct qed_ll2_info *p_ll2_conn)
{
        enum qed_ll2_conn_type conn_type = p_ll2_conn->input.conn_type;
        struct qed_ll2_tx_queue *p_tx = &p_ll2_conn->tx_queue;

        struct core_tx_start_ramrod_data *p_ramrod = NULL;
        struct qed_spq_entry *p_ent = NULL;
        struct qed_sp_init_data init_data;
        u16 pq_id = 0, pbl_size;
        int rc = -EINVAL;

        if (!QED_LL2_TX_REGISTERED(p_ll2_conn))
                return 0;

        if (p_ll2_conn->input.conn_type == QED_LL2_TYPE_OOO)
                p_ll2_conn->tx_stats_en = 0;
        else
                p_ll2_conn->tx_stats_en = 1;

        /* Get SPQ entry */
        memset(&init_data, 0, sizeof(init_data));
        init_data.cid = p_ll2_conn->cid;
        init_data.opaque_fid = p_hwfn->hw_info.opaque_fid;
        init_data.comp_mode = QED_SPQ_MODE_EBLOCK;

        rc = qed_sp_init_request(p_hwfn, &p_ent,
                                 CORE_RAMROD_TX_QUEUE_START,
                                 PROTOCOLID_CORE, &init_data);
        if (rc)
                return rc;

        p_ramrod = &p_ent->ramrod.core_tx_queue_start;

        p_ramrod->sb_id = cpu_to_le16(qed_int_get_sp_sb_id(p_hwfn));
        p_ramrod->sb_index = p_tx->tx_sb_index;
        p_ramrod->mtu = cpu_to_le16(p_ll2_conn->input.mtu);
        p_ramrod->stats_en = p_ll2_conn->tx_stats_en;
        p_ramrod->stats_id = p_ll2_conn->tx_stats_id;

        DMA_REGPAIR_LE(p_ramrod->pbl_base_addr,
                       qed_chain_get_pbl_phys(&p_tx->txq_chain));
        pbl_size = qed_chain_get_page_cnt(&p_tx->txq_chain);
        p_ramrod->pbl_size = cpu_to_le16(pbl_size);

        switch (p_ll2_conn->input.tx_tc) {
        case PURE_LB_TC:
                pq_id = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_LB);
                break;
        case PKT_LB_TC:
                pq_id = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_OOO);
                break;
        default:
                pq_id = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_OFLD);
                break;
        }

        p_ramrod->qm_pq_id = cpu_to_le16(pq_id);

        switch (conn_type) {
        case QED_LL2_TYPE_FCOE:
                p_ramrod->conn_type = PROTOCOLID_FCOE;
                break;
        case QED_LL2_TYPE_ISCSI:
                p_ramrod->conn_type = PROTOCOLID_ISCSI;
                break;
        case QED_LL2_TYPE_ROCE:
                p_ramrod->conn_type = PROTOCOLID_ROCE;
                break;
        case QED_LL2_TYPE_IWARP:
                p_ramrod->conn_type = PROTOCOLID_IWARP;
                break;
        case QED_LL2_TYPE_OOO:
                if (p_hwfn->hw_info.personality == QED_PCI_ISCSI)
                        p_ramrod->conn_type = PROTOCOLID_ISCSI;
                else
                        p_ramrod->conn_type = PROTOCOLID_IWARP;
                break;
        default:
                p_ramrod->conn_type = PROTOCOLID_ETH;
                DP_NOTICE(p_hwfn, "Unknown connection type: %d\n", conn_type);
        }

        p_ramrod->gsi_offload_flag = p_ll2_conn->input.gsi_enable;

        rc = qed_spq_post(p_hwfn, p_ent, NULL);
        if (rc)
                return rc;

        rc = qed_db_recovery_add(p_hwfn->cdev, p_tx->doorbell_addr,
                                 &p_tx->db_msg, DB_REC_WIDTH_32B,
                                 DB_REC_KERNEL);
        return rc;
}

static int qed_sp_ll2_rx_queue_stop(struct qed_hwfn *p_hwfn,
                                    struct qed_ll2_info *p_ll2_conn)
{
        struct core_rx_stop_ramrod_data *p_ramrod = NULL;
        struct qed_spq_entry *p_ent = NULL;
        struct qed_sp_init_data init_data;
        int rc = -EINVAL;

        /* Get SPQ entry */
        memset(&init_data, 0, sizeof(init_data));
        init_data.cid = p_ll2_conn->cid;
        init_data.opaque_fid = p_hwfn->hw_info.opaque_fid;
        init_data.comp_mode = QED_SPQ_MODE_EBLOCK;

        rc = qed_sp_init_request(p_hwfn, &p_ent,
                                 CORE_RAMROD_RX_QUEUE_STOP,
                                 PROTOCOLID_CORE, &init_data);
        if (rc)
                return rc;

        p_ramrod = &p_ent->ramrod.core_rx_queue_stop;

        p_ramrod->complete_event_flg = 1;
        p_ramrod->queue_id = p_ll2_conn->queue_id;

        return qed_spq_post(p_hwfn, p_ent, NULL);
}

static int qed_sp_ll2_tx_queue_stop(struct qed_hwfn *p_hwfn,
                                    struct qed_ll2_info *p_ll2_conn)
{
        struct qed_ll2_tx_queue *p_tx = &p_ll2_conn->tx_queue;
        struct qed_spq_entry *p_ent = NULL;
        struct qed_sp_init_data init_data;
        int rc = -EINVAL;
        qed_db_recovery_del(p_hwfn->cdev, p_tx->doorbell_addr, &p_tx->db_msg);

        /* Get SPQ entry */
        memset(&init_data, 0, sizeof(init_data));
        init_data.cid = p_ll2_conn->cid;
        init_data.opaque_fid = p_hwfn->hw_info.opaque_fid;
        init_data.comp_mode = QED_SPQ_MODE_EBLOCK;

        rc = qed_sp_init_request(p_hwfn, &p_ent,
                                 CORE_RAMROD_TX_QUEUE_STOP,
                                 PROTOCOLID_CORE, &init_data);
        if (rc)
                return rc;

        return qed_spq_post(p_hwfn, p_ent, NULL);
}

static int
qed_ll2_acquire_connection_rx(struct qed_hwfn *p_hwfn,
                              struct qed_ll2_info *p_ll2_info)
{
        struct qed_chain_init_params params = {
                .intended_use   = QED_CHAIN_USE_TO_CONSUME_PRODUCE,
                .cnt_type       = QED_CHAIN_CNT_TYPE_U16,
                .num_elems      = p_ll2_info->input.rx_num_desc,
        };
        struct qed_dev *cdev = p_hwfn->cdev;
        struct qed_ll2_rx_packet *p_descq;
        u32 capacity;
        int rc = 0;

        if (!p_ll2_info->input.rx_num_desc)
                goto out;

        params.mode = QED_CHAIN_MODE_NEXT_PTR;
        params.elem_size = sizeof(struct core_rx_bd);

        rc = qed_chain_alloc(cdev, &p_ll2_info->rx_queue.rxq_chain, &params);
        if (rc) {
                DP_NOTICE(p_hwfn, "Failed to allocate ll2 rxq chain\n");
                goto out;
        }

        capacity = qed_chain_get_capacity(&p_ll2_info->rx_queue.rxq_chain);
        p_descq = kcalloc(capacity, sizeof(struct qed_ll2_rx_packet),
                          GFP_KERNEL);
        if (!p_descq) {
                rc = -ENOMEM;
                DP_NOTICE(p_hwfn, "Failed to allocate ll2 Rx desc\n");
                goto out;
        }
        p_ll2_info->rx_queue.descq_array = p_descq;

        params.mode = QED_CHAIN_MODE_PBL;
        params.elem_size = sizeof(struct core_rx_fast_path_cqe);

        rc = qed_chain_alloc(cdev, &p_ll2_info->rx_queue.rcq_chain, &params);
        if (rc) {
                DP_NOTICE(p_hwfn, "Failed to allocate ll2 rcq chain\n");
                goto out;
        }

        DP_VERBOSE(p_hwfn, QED_MSG_LL2,
                   "Allocated LL2 Rxq [Type %08x] with 0x%08x buffers\n",
                   p_ll2_info->input.conn_type, p_ll2_info->input.rx_num_desc);

out:
        return rc;
}

static int qed_ll2_acquire_connection_tx(struct qed_hwfn *p_hwfn,
                                         struct qed_ll2_info *p_ll2_info)
{
        struct qed_chain_init_params params = {
                .mode           = QED_CHAIN_MODE_PBL,
                .intended_use   = QED_CHAIN_USE_TO_CONSUME_PRODUCE,
                .cnt_type       = QED_CHAIN_CNT_TYPE_U16,
                .num_elems      = p_ll2_info->input.tx_num_desc,
                .elem_size      = sizeof(struct core_tx_bd),
        };
        struct qed_ll2_tx_packet *p_descq;
        size_t desc_size;
        u32 capacity;
        int rc = 0;

        if (!p_ll2_info->input.tx_num_desc)
                goto out;

        rc = qed_chain_alloc(p_hwfn->cdev, &p_ll2_info->tx_queue.txq_chain,
                             &params);
        if (rc)
                goto out;

        capacity = qed_chain_get_capacity(&p_ll2_info->tx_queue.txq_chain);
        /* All bds_set elements are flexibily added. */
        desc_size = struct_size(p_descq, bds_set,
                                p_ll2_info->input.tx_max_bds_per_packet);

        p_descq = kcalloc(capacity, desc_size, GFP_KERNEL);
        if (!p_descq) {
                rc = -ENOMEM;
                goto out;
        }
        p_ll2_info->tx_queue.descq_mem = p_descq;

        DP_VERBOSE(p_hwfn, QED_MSG_LL2,
                   "Allocated LL2 Txq [Type %08x] with 0x%08x buffers\n",
                   p_ll2_info->input.conn_type, p_ll2_info->input.tx_num_desc);

out:
        if (rc)
                DP_NOTICE(p_hwfn,
                          "Can't allocate memory for Tx LL2 with 0x%08x buffers\n",
                          p_ll2_info->input.tx_num_desc);
        return rc;
}

static int
qed_ll2_acquire_connection_ooo(struct qed_hwfn *p_hwfn,
                               struct qed_ll2_info *p_ll2_info, u16 mtu)
{
        struct qed_ooo_buffer *p_buf = NULL;
        void *p_virt;
        u16 buf_idx;
        int rc = 0;

        if (p_ll2_info->input.conn_type != QED_LL2_TYPE_OOO)
                return rc;

        /* Correct number of requested OOO buffers if needed */
        if (!p_ll2_info->input.rx_num_ooo_buffers) {
                u16 num_desc = p_ll2_info->input.rx_num_desc;

                if (!num_desc)
                        return -EINVAL;
                p_ll2_info->input.rx_num_ooo_buffers = num_desc * 2;
        }

        for (buf_idx = 0; buf_idx < p_ll2_info->input.rx_num_ooo_buffers;
             buf_idx++) {
                p_buf = kzalloc(sizeof(*p_buf), GFP_KERNEL);
                if (!p_buf) {
                        rc = -ENOMEM;
                        goto out;
                }

                p_buf->rx_buffer_size = mtu + 26 + ETH_CACHE_LINE_SIZE;
                p_buf->rx_buffer_size = (p_buf->rx_buffer_size +
                                         ETH_CACHE_LINE_SIZE - 1) &
                                        ~(ETH_CACHE_LINE_SIZE - 1);
                p_virt = dma_alloc_coherent(&p_hwfn->cdev->pdev->dev,
                                            p_buf->rx_buffer_size,
                                            &p_buf->rx_buffer_phys_addr,
                                            GFP_KERNEL);
                if (!p_virt) {
                        kfree(p_buf);
                        rc = -ENOMEM;
                        goto out;
                }

                p_buf->rx_buffer_virt_addr = p_virt;
                qed_ooo_put_free_buffer(p_hwfn, p_hwfn->p_ooo_info, p_buf);
        }

        DP_VERBOSE(p_hwfn, QED_MSG_LL2,
                   "Allocated [%04x] LL2 OOO buffers [each of size 0x%08x]\n",
                   p_ll2_info->input.rx_num_ooo_buffers, p_buf->rx_buffer_size);

out:
        return rc;
}

static int
qed_ll2_set_cbs(struct qed_ll2_info *p_ll2_info, const struct qed_ll2_cbs *cbs)
{
        if (!cbs || (!cbs->rx_comp_cb ||
                     !cbs->rx_release_cb ||
                     !cbs->tx_comp_cb || !cbs->tx_release_cb || !cbs->cookie))
                return -EINVAL;

        p_ll2_info->cbs.rx_comp_cb = cbs->rx_comp_cb;
        p_ll2_info->cbs.rx_release_cb = cbs->rx_release_cb;
        p_ll2_info->cbs.tx_comp_cb = cbs->tx_comp_cb;
        p_ll2_info->cbs.tx_release_cb = cbs->tx_release_cb;
        p_ll2_info->cbs.slowpath_cb = cbs->slowpath_cb;
        p_ll2_info->cbs.cookie = cbs->cookie;

        return 0;
}

static void _qed_ll2_calc_allowed_conns(struct qed_hwfn *p_hwfn,
                                        struct qed_ll2_acquire_data *data,
                                        u8 *start_idx, u8 *last_idx)
{
        /* LL2 queues handles will be split as follows:
         * First will be the legacy queues, and then the ctx based.
         */
        if (data->input.rx_conn_type == QED_LL2_RX_TYPE_LEGACY) {
                *start_idx = QED_LL2_LEGACY_CONN_BASE_PF;
                *last_idx = *start_idx +
                        QED_MAX_NUM_OF_LEGACY_LL2_CONNS_PF;
        } else {
                /* QED_LL2_RX_TYPE_CTX */
                *start_idx = QED_LL2_CTX_CONN_BASE_PF;
                *last_idx = *start_idx +
                        QED_MAX_NUM_OF_CTX_LL2_CONNS_PF;
        }
}

static enum core_error_handle
qed_ll2_get_error_choice(enum qed_ll2_error_handle err)
{
        switch (err) {
        case QED_LL2_DROP_PACKET:
                return LL2_DROP_PACKET;
        case QED_LL2_DO_NOTHING:
                return LL2_DO_NOTHING;
        case QED_LL2_ASSERT:
                return LL2_ASSERT;
        default:
                return LL2_DO_NOTHING;
        }
}

int qed_ll2_acquire_connection(void *cxt, struct qed_ll2_acquire_data *data)
{
        struct qed_hwfn *p_hwfn = cxt;
        qed_int_comp_cb_t comp_rx_cb, comp_tx_cb;
        struct qed_ll2_info *p_ll2_info = NULL;
        u8 i, first_idx, last_idx, *p_tx_max;
        int rc;

        if (!data->p_connection_handle || !p_hwfn->p_ll2_info)
                return -EINVAL;

        _qed_ll2_calc_allowed_conns(p_hwfn, data, &first_idx, &last_idx);

        /* Find a free connection to be used */
        for (i = first_idx; i < last_idx; i++) {
                mutex_lock(&p_hwfn->p_ll2_info[i].mutex);
                if (p_hwfn->p_ll2_info[i].b_active) {
                        mutex_unlock(&p_hwfn->p_ll2_info[i].mutex);
                        continue;
                }

                p_hwfn->p_ll2_info[i].b_active = true;
                p_ll2_info = &p_hwfn->p_ll2_info[i];
                mutex_unlock(&p_hwfn->p_ll2_info[i].mutex);
                break;
        }
        if (!p_ll2_info)
                return -EBUSY;

        memcpy(&p_ll2_info->input, &data->input, sizeof(p_ll2_info->input));

        switch (data->input.tx_dest) {
        case QED_LL2_TX_DEST_NW:
                p_ll2_info->tx_dest = CORE_TX_DEST_NW;
                break;
        case QED_LL2_TX_DEST_LB:
                p_ll2_info->tx_dest = CORE_TX_DEST_LB;
                break;
        case QED_LL2_TX_DEST_DROP:
                p_ll2_info->tx_dest = CORE_TX_DEST_DROP;
                break;
        default:
                return -EINVAL;
        }

        if (data->input.conn_type == QED_LL2_TYPE_OOO ||
            data->input.secondary_queue)
                p_ll2_info->main_func_queue = false;
        else
                p_ll2_info->main_func_queue = true;

        /* Correct maximum number of Tx BDs */
        p_tx_max = &p_ll2_info->input.tx_max_bds_per_packet;
        if (*p_tx_max == 0)
                *p_tx_max = CORE_LL2_TX_MAX_BDS_PER_PACKET;
        else
                *p_tx_max = min_t(u8, *p_tx_max,
                                  CORE_LL2_TX_MAX_BDS_PER_PACKET);

        rc = qed_ll2_set_cbs(p_ll2_info, data->cbs);
        if (rc) {
                DP_NOTICE(p_hwfn, "Invalid callback functions\n");
                goto q_allocate_fail;
        }

        rc = qed_ll2_acquire_connection_rx(p_hwfn, p_ll2_info);
        if (rc)
                goto q_allocate_fail;

        rc = qed_ll2_acquire_connection_tx(p_hwfn, p_ll2_info);
        if (rc)
                goto q_allocate_fail;

        rc = qed_ll2_acquire_connection_ooo(p_hwfn, p_ll2_info,
                                            data->input.mtu);
        if (rc)
                goto q_allocate_fail;

        /* Register callbacks for the Rx/Tx queues */
        if (data->input.conn_type == QED_LL2_TYPE_OOO) {
                comp_rx_cb = qed_ll2_lb_rxq_completion;
                comp_tx_cb = qed_ll2_lb_txq_completion;
        } else {
                comp_rx_cb = qed_ll2_rxq_completion;
                comp_tx_cb = qed_ll2_txq_completion;
        }

        if (data->input.rx_num_desc) {
                qed_int_register_cb(p_hwfn, comp_rx_cb,
                                    &p_hwfn->p_ll2_info[i],
                                    &p_ll2_info->rx_queue.rx_sb_index,
                                    &p_ll2_info->rx_queue.p_fw_cons);
                p_ll2_info->rx_queue.b_cb_registered = true;
        }

        if (data->input.tx_num_desc) {
                qed_int_register_cb(p_hwfn,
                                    comp_tx_cb,
                                    &p_hwfn->p_ll2_info[i],
                                    &p_ll2_info->tx_queue.tx_sb_index,
                                    &p_ll2_info->tx_queue.p_fw_cons);
                p_ll2_info->tx_queue.b_cb_registered = true;
        }

        *data->p_connection_handle = i;
        return rc;

q_allocate_fail:
        qed_ll2_release_connection(p_hwfn, i);
        return -ENOMEM;
}

static int qed_ll2_establish_connection_rx(struct qed_hwfn *p_hwfn,
                                           struct qed_ll2_info *p_ll2_conn)
{
        enum qed_ll2_error_handle error_input;
        enum core_error_handle error_mode;
        u8 action_on_error = 0;
        int rc;

        if (!QED_LL2_RX_REGISTERED(p_ll2_conn))
                return 0;

        DIRECT_REG_WR(p_ll2_conn->rx_queue.set_prod_addr, 0x0);
        error_input = p_ll2_conn->input.ai_err_packet_too_big;
        error_mode = qed_ll2_get_error_choice(error_input);
        SET_FIELD(action_on_error,
                  CORE_RX_ACTION_ON_ERROR_PACKET_TOO_BIG, error_mode);
        error_input = p_ll2_conn->input.ai_err_no_buf;
        error_mode = qed_ll2_get_error_choice(error_input);
        SET_FIELD(action_on_error, CORE_RX_ACTION_ON_ERROR_NO_BUFF, error_mode);

        rc = qed_sp_ll2_rx_queue_start(p_hwfn, p_ll2_conn, action_on_error);
        if (rc)
                return rc;

        if (p_ll2_conn->rx_queue.ctx_based) {
                rc = qed_db_recovery_add(p_hwfn->cdev,
                                         p_ll2_conn->rx_queue.set_prod_addr,
                                         &p_ll2_conn->rx_queue.db_data,
                                         DB_REC_WIDTH_64B, DB_REC_KERNEL);
        }

        return rc;
}

static void
qed_ll2_establish_connection_ooo(struct qed_hwfn *p_hwfn,
                                 struct qed_ll2_info *p_ll2_conn)
{
        if (p_ll2_conn->input.conn_type != QED_LL2_TYPE_OOO)
                return;

        qed_ooo_release_all_isles(p_hwfn, p_hwfn->p_ooo_info);
        qed_ooo_submit_rx_buffers(p_hwfn, p_ll2_conn);
}

static inline u8 qed_ll2_handle_to_queue_id(struct qed_hwfn *p_hwfn,
                                            u8 handle,
                                            u8 ll2_queue_type)
{
        u8 qid;

        if (ll2_queue_type == QED_LL2_RX_TYPE_LEGACY)
                return p_hwfn->hw_info.resc_start[QED_LL2_RAM_QUEUE] + handle;

        /* QED_LL2_RX_TYPE_CTX
         * FW distinguishes between the legacy queues (ram based) and the
         * ctx based queues by the queue_id.
         * The first MAX_NUM_LL2_RX_RAM_QUEUES queues are legacy
         * and the queue ids above that are ctx base.
         */
        qid = p_hwfn->hw_info.resc_start[QED_LL2_CTX_QUEUE] +
              MAX_NUM_LL2_RX_RAM_QUEUES;

        /* See comment on the acquire connection for how the ll2
         * queues handles are divided.
         */
        qid += (handle - QED_MAX_NUM_OF_LEGACY_LL2_CONNS_PF);

        return qid;
}

int qed_ll2_establish_connection(void *cxt, u8 connection_handle)
{
        struct e4_core_conn_context *p_cxt;
        struct qed_ll2_tx_packet *p_pkt;
        struct qed_ll2_info *p_ll2_conn;
        struct qed_hwfn *p_hwfn = cxt;
        struct qed_ll2_rx_queue *p_rx;
        struct qed_ll2_tx_queue *p_tx;
        struct qed_cxt_info cxt_info;
        struct qed_ptt *p_ptt;
        int rc = -EINVAL;
        u32 i, capacity;
        size_t desc_size;
        u8 qid;

        p_ptt = qed_ptt_acquire(p_hwfn);
        if (!p_ptt)
                return -EAGAIN;

        p_ll2_conn = qed_ll2_handle_sanity_lock(p_hwfn, connection_handle);
        if (!p_ll2_conn) {
                rc = -EINVAL;
                goto out;
        }

        p_rx = &p_ll2_conn->rx_queue;
        p_tx = &p_ll2_conn->tx_queue;

        qed_chain_reset(&p_rx->rxq_chain);
        qed_chain_reset(&p_rx->rcq_chain);
        INIT_LIST_HEAD(&p_rx->active_descq);
        INIT_LIST_HEAD(&p_rx->free_descq);
        INIT_LIST_HEAD(&p_rx->posting_descq);
        spin_lock_init(&p_rx->lock);
        capacity = qed_chain_get_capacity(&p_rx->rxq_chain);
        for (i = 0; i < capacity; i++)
                list_add_tail(&p_rx->descq_array[i].list_entry,
                              &p_rx->free_descq);
        *p_rx->p_fw_cons = 0;

        qed_chain_reset(&p_tx->txq_chain);
        INIT_LIST_HEAD(&p_tx->active_descq);
        INIT_LIST_HEAD(&p_tx->free_descq);
        INIT_LIST_HEAD(&p_tx->sending_descq);
        spin_lock_init(&p_tx->lock);
        capacity = qed_chain_get_capacity(&p_tx->txq_chain);
        /* All bds_set elements are flexibily added. */
        desc_size = struct_size(p_pkt, bds_set,
                                p_ll2_conn->input.tx_max_bds_per_packet);

        for (i = 0; i < capacity; i++) {
                p_pkt = p_tx->descq_mem + desc_size * i;
                list_add_tail(&p_pkt->list_entry, &p_tx->free_descq);
        }
        p_tx->cur_completing_bd_idx = 0;
        p_tx->bds_idx = 0;
        p_tx->b_completing_packet = false;
        p_tx->cur_send_packet = NULL;
        p_tx->cur_send_frag_num = 0;
        p_tx->cur_completing_frag_num = 0;
        *p_tx->p_fw_cons = 0;

        rc = qed_cxt_acquire_cid(p_hwfn, PROTOCOLID_CORE, &p_ll2_conn->cid);
        if (rc)
                goto out;
        cxt_info.iid = p_ll2_conn->cid;
        rc = qed_cxt_get_cid_info(p_hwfn, &cxt_info);
        if (rc) {
                DP_NOTICE(p_hwfn, "Cannot find context info for cid=%d\n",
                          p_ll2_conn->cid);
                goto out;
        }

        p_cxt = cxt_info.p_cxt;

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

        qid = qed_ll2_handle_to_queue_id(p_hwfn, connection_handle,
                                         p_ll2_conn->input.rx_conn_type);
        p_ll2_conn->queue_id = qid;
        p_ll2_conn->tx_stats_id = qid;

        DP_VERBOSE(p_hwfn, QED_MSG_LL2,
                   "Establishing ll2 queue. PF %d ctx_based=%d abs qid=%d\n",
                   p_hwfn->rel_pf_id, p_ll2_conn->input.rx_conn_type, qid);

        if (p_ll2_conn->input.rx_conn_type == QED_LL2_RX_TYPE_LEGACY) {
                p_rx->set_prod_addr = p_hwfn->regview +
                    GTT_BAR0_MAP_REG_TSDM_RAM + TSTORM_LL2_RX_PRODS_OFFSET(qid);
        } else {
                /* QED_LL2_RX_TYPE_CTX - using doorbell */
                p_rx->ctx_based = 1;

                p_rx->set_prod_addr = p_hwfn->doorbells +
                        p_hwfn->dpi_start_offset +
                        DB_ADDR_SHIFT(DQ_PWM_OFFSET_TCM_LL2_PROD_UPDATE);

                /* prepare db data */
                p_rx->db_data.icid = cpu_to_le16((u16)p_ll2_conn->cid);
                SET_FIELD(p_rx->db_data.params,
                          CORE_PWM_PROD_UPDATE_DATA_AGG_CMD, DB_AGG_CMD_SET);
                SET_FIELD(p_rx->db_data.params,
                          CORE_PWM_PROD_UPDATE_DATA_RESERVED1, 0);
        }

        p_tx->doorbell_addr = (u8 __iomem *)p_hwfn->doorbells +
                                            qed_db_addr(p_ll2_conn->cid,
                                                        DQ_DEMS_LEGACY);
        /* prepare db data */
        SET_FIELD(p_tx->db_msg.params, CORE_DB_DATA_DEST, DB_DEST_XCM);
        SET_FIELD(p_tx->db_msg.params, CORE_DB_DATA_AGG_CMD, DB_AGG_CMD_SET);
        SET_FIELD(p_tx->db_msg.params, CORE_DB_DATA_AGG_VAL_SEL,
                  DQ_XCM_CORE_TX_BD_PROD_CMD);
        p_tx->db_msg.agg_flags = DQ_XCM_CORE_DQ_CF_CMD;

        rc = qed_ll2_establish_connection_rx(p_hwfn, p_ll2_conn);
        if (rc)
                goto out;

        rc = qed_sp_ll2_tx_queue_start(p_hwfn, p_ll2_conn);
        if (rc)
                goto out;

        if (!QED_IS_RDMA_PERSONALITY(p_hwfn))
                qed_wr(p_hwfn, p_ptt, PRS_REG_USE_LIGHT_L2, 1);

        qed_ll2_establish_connection_ooo(p_hwfn, p_ll2_conn);

        if (p_ll2_conn->input.conn_type == QED_LL2_TYPE_FCOE) {
                if (!test_bit(QED_MF_UFP_SPECIFIC, &p_hwfn->cdev->mf_bits))
                        qed_llh_add_protocol_filter(p_hwfn->cdev, 0,
                                                    QED_LLH_FILTER_ETHERTYPE,
                                                    ETH_P_FCOE, 0);
                qed_llh_add_protocol_filter(p_hwfn->cdev, 0,
                                            QED_LLH_FILTER_ETHERTYPE,
                                            ETH_P_FIP, 0);
        }

out:
        qed_ptt_release(p_hwfn, p_ptt);
        return rc;
}

static void qed_ll2_post_rx_buffer_notify_fw(struct qed_hwfn *p_hwfn,
                                             struct qed_ll2_rx_queue *p_rx,
                                             struct qed_ll2_rx_packet *p_curp)
{
        struct qed_ll2_rx_packet *p_posting_packet = NULL;
        struct core_ll2_rx_prod rx_prod = { 0, 0 };
        bool b_notify_fw = false;
        u16 bd_prod, cq_prod;

        /* This handles the flushing of already posted buffers */
        while (!list_empty(&p_rx->posting_descq)) {
                p_posting_packet = list_first_entry(&p_rx->posting_descq,
                                                    struct qed_ll2_rx_packet,
                                                    list_entry);
                list_move_tail(&p_posting_packet->list_entry,
                               &p_rx->active_descq);
                b_notify_fw = true;
        }

        /* This handles the supplied packet [if there is one] */
        if (p_curp) {
                list_add_tail(&p_curp->list_entry, &p_rx->active_descq);
                b_notify_fw = true;
        }

        if (!b_notify_fw)
                return;

        bd_prod = qed_chain_get_prod_idx(&p_rx->rxq_chain);
        cq_prod = qed_chain_get_prod_idx(&p_rx->rcq_chain);
        if (p_rx->ctx_based) {
                /* update producer by giving a doorbell */
                p_rx->db_data.prod.bd_prod = cpu_to_le16(bd_prod);
                p_rx->db_data.prod.cqe_prod = cpu_to_le16(cq_prod);
                /* Make sure chain element is updated before ringing the
                 * doorbell
                 */
                dma_wmb();
                DIRECT_REG_WR64(p_rx->set_prod_addr,
                                *((u64 *)&p_rx->db_data));
        } else {
                rx_prod.bd_prod = cpu_to_le16(bd_prod);
                rx_prod.cqe_prod = cpu_to_le16(cq_prod);

                /* Make sure chain element is updated before ringing the
                 * doorbell
                 */
                dma_wmb();

                DIRECT_REG_WR(p_rx->set_prod_addr, *((u32 *)&rx_prod));
        }
}

int qed_ll2_post_rx_buffer(void *cxt,
                           u8 connection_handle,
                           dma_addr_t addr,
                           u16 buf_len, void *cookie, u8 notify_fw)
{
        struct qed_hwfn *p_hwfn = cxt;
        struct core_rx_bd_with_buff_len *p_curb = NULL;
        struct qed_ll2_rx_packet *p_curp = NULL;
        struct qed_ll2_info *p_ll2_conn;
        struct qed_ll2_rx_queue *p_rx;
        unsigned long flags;
        void *p_data;
        int rc = 0;

        p_ll2_conn = qed_ll2_handle_sanity(p_hwfn, connection_handle);
        if (!p_ll2_conn)
                return -EINVAL;
        p_rx = &p_ll2_conn->rx_queue;
        if (!p_rx->set_prod_addr)
                return -EIO;

        spin_lock_irqsave(&p_rx->lock, flags);
        if (!list_empty(&p_rx->free_descq))
                p_curp = list_first_entry(&p_rx->free_descq,
                                          struct qed_ll2_rx_packet, list_entry);
        if (p_curp) {
                if (qed_chain_get_elem_left(&p_rx->rxq_chain) &&
                    qed_chain_get_elem_left(&p_rx->rcq_chain)) {
                        p_data = qed_chain_produce(&p_rx->rxq_chain);
                        p_curb = (struct core_rx_bd_with_buff_len *)p_data;
                        qed_chain_produce(&p_rx->rcq_chain);
                }
        }

        /* If we're lacking entires, let's try to flush buffers to FW */
        if (!p_curp || !p_curb) {
                rc = -EBUSY;
                p_curp = NULL;
                goto out_notify;
        }

        /* We have an Rx packet we can fill */
        DMA_REGPAIR_LE(p_curb->addr, addr);
        p_curb->buff_length = cpu_to_le16(buf_len);
        p_curp->rx_buf_addr = addr;
        p_curp->cookie = cookie;
        p_curp->rxq_bd = p_curb;
        p_curp->buf_length = buf_len;
        list_del(&p_curp->list_entry);

        /* Check if we only want to enqueue this packet without informing FW */
        if (!notify_fw) {
                list_add_tail(&p_curp->list_entry, &p_rx->posting_descq);
                goto out;
        }

out_notify:
        qed_ll2_post_rx_buffer_notify_fw(p_hwfn, p_rx, p_curp);
out:
        spin_unlock_irqrestore(&p_rx->lock, flags);
        return rc;
}

static void qed_ll2_prepare_tx_packet_set(struct qed_hwfn *p_hwfn,
                                          struct qed_ll2_tx_queue *p_tx,
                                          struct qed_ll2_tx_packet *p_curp,
                                          struct qed_ll2_tx_pkt_info *pkt,
                                          u8 notify_fw)
{
        list_del(&p_curp->list_entry);
        p_curp->cookie = pkt->cookie;
        p_curp->bd_used = pkt->num_of_bds;
        p_curp->notify_fw = notify_fw;
        p_tx->cur_send_packet = p_curp;
        p_tx->cur_send_frag_num = 0;

        p_curp->bds_set[p_tx->cur_send_frag_num].tx_frag = pkt->first_frag;
        p_curp->bds_set[p_tx->cur_send_frag_num].frag_len = pkt->first_frag_len;
        p_tx->cur_send_frag_num++;
}

static void
qed_ll2_prepare_tx_packet_set_bd(struct qed_hwfn *p_hwfn,
                                 struct qed_ll2_info *p_ll2,
                                 struct qed_ll2_tx_packet *p_curp,
                                 struct qed_ll2_tx_pkt_info *pkt)
{
        struct qed_chain *p_tx_chain = &p_ll2->tx_queue.txq_chain;
        u16 prod_idx = qed_chain_get_prod_idx(p_tx_chain);
        struct core_tx_bd *start_bd = NULL;
        enum core_roce_flavor_type roce_flavor;
        enum core_tx_dest tx_dest;
        u16 bd_data = 0, frag_idx;
        u16 bitfield1;

        roce_flavor = (pkt->qed_roce_flavor == QED_LL2_ROCE) ? CORE_ROCE
                                                             : CORE_RROCE;

        switch (pkt->tx_dest) {
        case QED_LL2_TX_DEST_NW:
                tx_dest = CORE_TX_DEST_NW;
                break;
        case QED_LL2_TX_DEST_LB:
                tx_dest = CORE_TX_DEST_LB;
                break;
        case QED_LL2_TX_DEST_DROP:
                tx_dest = CORE_TX_DEST_DROP;
                break;
        default:
                tx_dest = CORE_TX_DEST_LB;
                break;
        }

        start_bd = (struct core_tx_bd *)qed_chain_produce(p_tx_chain);
        if (QED_IS_IWARP_PERSONALITY(p_hwfn) &&
            p_ll2->input.conn_type == QED_LL2_TYPE_OOO) {
                start_bd->nw_vlan_or_lb_echo =
                    cpu_to_le16(IWARP_LL2_IN_ORDER_TX_QUEUE);
        } else {
                start_bd->nw_vlan_or_lb_echo = cpu_to_le16(pkt->vlan);
                if (test_bit(QED_MF_UFP_SPECIFIC, &p_hwfn->cdev->mf_bits) &&
                    p_ll2->input.conn_type == QED_LL2_TYPE_FCOE)
                        pkt->remove_stag = true;
        }

        bitfield1 = le16_to_cpu(start_bd->bitfield1);
        SET_FIELD(bitfield1, CORE_TX_BD_L4_HDR_OFFSET_W, pkt->l4_hdr_offset_w);
        SET_FIELD(bitfield1, CORE_TX_BD_TX_DST, tx_dest);
        start_bd->bitfield1 = cpu_to_le16(bitfield1);

        bd_data |= pkt->bd_flags;
        SET_FIELD(bd_data, CORE_TX_BD_DATA_START_BD, 0x1);
        SET_FIELD(bd_data, CORE_TX_BD_DATA_NBDS, pkt->num_of_bds);
        SET_FIELD(bd_data, CORE_TX_BD_DATA_ROCE_FLAV, roce_flavor);
        SET_FIELD(bd_data, CORE_TX_BD_DATA_IP_CSUM, !!(pkt->enable_ip_cksum));
        SET_FIELD(bd_data, CORE_TX_BD_DATA_L4_CSUM, !!(pkt->enable_l4_cksum));
        SET_FIELD(bd_data, CORE_TX_BD_DATA_IP_LEN, !!(pkt->calc_ip_len));
        SET_FIELD(bd_data, CORE_TX_BD_DATA_DISABLE_STAG_INSERTION,
                  !!(pkt->remove_stag));

        start_bd->bd_data.as_bitfield = cpu_to_le16(bd_data);
        DMA_REGPAIR_LE(start_bd->addr, pkt->first_frag);
        start_bd->nbytes = cpu_to_le16(pkt->first_frag_len);

        DP_VERBOSE(p_hwfn,
                   (NETIF_MSG_TX_QUEUED | QED_MSG_LL2),
                   "LL2 [q 0x%02x cid 0x%08x type 0x%08x] Tx Producer at [0x%04x] - set with a %04x bytes %02x BDs buffer at %08x:%08x\n",
                   p_ll2->queue_id,
                   p_ll2->cid,
                   p_ll2->input.conn_type,
                   prod_idx,
                   pkt->first_frag_len,
                   pkt->num_of_bds,
                   le32_to_cpu(start_bd->addr.hi),
                   le32_to_cpu(start_bd->addr.lo));

        if (p_ll2->tx_queue.cur_send_frag_num == pkt->num_of_bds)
                return;

        /* Need to provide the packet with additional BDs for frags */
        for (frag_idx = p_ll2->tx_queue.cur_send_frag_num;
             frag_idx < pkt->num_of_bds; frag_idx++) {
                struct core_tx_bd **p_bd = &p_curp->bds_set[frag_idx].txq_bd;

                *p_bd = (struct core_tx_bd *)qed_chain_produce(p_tx_chain);
                (*p_bd)->bd_data.as_bitfield = 0;
                (*p_bd)->bitfield1 = 0;
                p_curp->bds_set[frag_idx].tx_frag = 0;
                p_curp->bds_set[frag_idx].frag_len = 0;
        }
}

/* This should be called while the Txq spinlock is being held */
static void qed_ll2_tx_packet_notify(struct qed_hwfn *p_hwfn,
                                     struct qed_ll2_info *p_ll2_conn)
{
        bool b_notify = p_ll2_conn->tx_queue.cur_send_packet->notify_fw;
        struct qed_ll2_tx_queue *p_tx = &p_ll2_conn->tx_queue;
        struct qed_ll2_tx_packet *p_pkt = NULL;
        u16 bd_prod;

        /* If there are missing BDs, don't do anything now */
        if (p_ll2_conn->tx_queue.cur_send_frag_num !=
            p_ll2_conn->tx_queue.cur_send_packet->bd_used)
                return;

        /* Push the current packet to the list and clean after it */
        list_add_tail(&p_ll2_conn->tx_queue.cur_send_packet->list_entry,
                      &p_ll2_conn->tx_queue.sending_descq);
        p_ll2_conn->tx_queue.cur_send_packet = NULL;
        p_ll2_conn->tx_queue.cur_send_frag_num = 0;

        /* Notify FW of packet only if requested to */
        if (!b_notify)
                return;

        bd_prod = qed_chain_get_prod_idx(&p_ll2_conn->tx_queue.txq_chain);

        while (!list_empty(&p_tx->sending_descq)) {
                p_pkt = list_first_entry(&p_tx->sending_descq,
                                         struct qed_ll2_tx_packet, list_entry);
                if (!p_pkt)
                        break;

                list_move_tail(&p_pkt->list_entry, &p_tx->active_descq);
        }

        p_tx->db_msg.spq_prod = cpu_to_le16(bd_prod);

        /* Make sure the BDs data is updated before ringing the doorbell */
        wmb();

        DIRECT_REG_WR(p_tx->doorbell_addr, *((u32 *)&p_tx->db_msg));

        DP_VERBOSE(p_hwfn,
                   (NETIF_MSG_TX_QUEUED | QED_MSG_LL2),
                   "LL2 [q 0x%02x cid 0x%08x type 0x%08x] Doorbelled [producer 0x%04x]\n",
                   p_ll2_conn->queue_id,
                   p_ll2_conn->cid,
                   p_ll2_conn->input.conn_type, p_tx->db_msg.spq_prod);
}

int qed_ll2_prepare_tx_packet(void *cxt,
                              u8 connection_handle,
                              struct qed_ll2_tx_pkt_info *pkt,
                              bool notify_fw)
{
        struct qed_hwfn *p_hwfn = cxt;
        struct qed_ll2_tx_packet *p_curp = NULL;
        struct qed_ll2_info *p_ll2_conn = NULL;
        struct qed_ll2_tx_queue *p_tx;
        struct qed_chain *p_tx_chain;
        unsigned long flags;
        int rc = 0;

        p_ll2_conn = qed_ll2_handle_sanity(p_hwfn, connection_handle);
        if (!p_ll2_conn)
                return -EINVAL;
        p_tx = &p_ll2_conn->tx_queue;
        p_tx_chain = &p_tx->txq_chain;

        if (pkt->num_of_bds > p_ll2_conn->input.tx_max_bds_per_packet)
                return -EIO;

        spin_lock_irqsave(&p_tx->lock, flags);
        if (p_tx->cur_send_packet) {
                rc = -EEXIST;
                goto out;
        }

        /* Get entry, but only if we have tx elements for it */
        if (!list_empty(&p_tx->free_descq))
                p_curp = list_first_entry(&p_tx->free_descq,
                                          struct qed_ll2_tx_packet, list_entry);
        if (p_curp && qed_chain_get_elem_left(p_tx_chain) < pkt->num_of_bds)
                p_curp = NULL;

        if (!p_curp) {
                rc = -EBUSY;
                goto out;
        }

        /* Prepare packet and BD, and perhaps send a doorbell to FW */
        qed_ll2_prepare_tx_packet_set(p_hwfn, p_tx, p_curp, pkt, notify_fw);

        qed_ll2_prepare_tx_packet_set_bd(p_hwfn, p_ll2_conn, p_curp, pkt);

        qed_ll2_tx_packet_notify(p_hwfn, p_ll2_conn);

out:
        spin_unlock_irqrestore(&p_tx->lock, flags);
        return rc;
}