Quelle  qed_ll2.c   Sprache: C

// 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_iro_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)

#define QED_LL2_INVALID_STATS_ID        0xff

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 u8 qed_ll2_handle_to_stats_id(struct qed_hwfn *p_hwfn,
         u8 ll2_queue_type, u8 qid)
{
 u8 stats_id;

 /* For legacy (RAM based) queues, the stats_id will be set as the
 * queue_id. Otherwise (context based queue), it will be set to
 * the "abs_pf_id" offset from the end of the RAM based queue IDs.
 * If the final value exceeds the total counters amount, return
 * INVALID value to indicate that the stats for this connection should
 * be disabled.
 */
 if (ll2_queue_type == QED_LL2_RX_TYPE_LEGACY)
  stats_id = qid;
 else
  stats_id = MAX_NUM_LL2_RX_RAM_QUEUES + p_hwfn->abs_pf_id;

 if (stats_id < MAX_NUM_LL2_TX_STATS_COUNTERS)
  return stats_id;
 else
  return QED_LL2_INVALID_STATS_ID;
}

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)
{
 size_t size = cdev->ll2->rx_size + NET_SKB_PAD +
        SKB_DATA_ALIGN(sizeof(struct skb_shared_info));

 *data = kmalloc(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 = slab_build_skb(buffer->data);
 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 (unlikely(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 (unlikely(!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 (unlikely(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 *ooo_opq;
 u32 cid;

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

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

 /* Need to make a flush */
 cid = le32_to_cpu(ooo_opq->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;
 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 *ooo_opq;
 u8 placement_offset = 0;
 u8 cqe_type;
 u32 cid;

 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 (unlikely(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);
  ooo_opq = (struct ooo_opaque *)&p_cqe_fp->opaque_data;
  qed_ooo_save_history_entry(p_hwfn, p_hwfn->p_ooo_info, ooo_opq);
  cid = le32_to_cpu(ooo_opq->cid);

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

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

  /* Now process create/add/join isles */
  if (unlikely(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 (likely(ooo_opq->ooo_opcode == TCP_EVENT_ADD_NEW_ISLE ||
      ooo_opq->ooo_opcode == TCP_EVENT_ADD_ISLE_RIGHT ||
      ooo_opq->ooo_opcode == TCP_EVENT_ADD_ISLE_LEFT ||
      ooo_opq->ooo_opcode == TCP_EVENT_ADD_PEN ||
      ooo_opq->ooo_opcode == TCP_EVENT_JOIN)) {
   if (unlikely(!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 (ooo_opq->ooo_opcode) {
   case TCP_EVENT_ADD_NEW_ISLE:
    qed_ooo_add_new_isle(p_hwfn,
           p_hwfn->p_ooo_info,
           cid,
           ooo_opq->ooo_isle,
           p_buffer);
    break;
   case TCP_EVENT_ADD_ISLE_RIGHT:
    qed_ooo_add_new_buffer(p_hwfn,
             p_hwfn->p_ooo_info,
             cid,
             ooo_opq->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,
             ooo_opq->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,
             ooo_opq->ooo_isle + 1,
             p_buffer,
             QED_OOO_LEFT_BUF);
    qed_ooo_join_isles(p_hwfn,
         p_hwfn->p_ooo_info,
         cid, ooo_opq->ooo_isle);
    break;
   case TCP_EVENT_ADD_PEN:
    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",
      ooo_opq->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 (unlikely(!p_ll2_conn))
  return 0;

 if (unlikely(!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 (unlikely(!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 (unlikely(!p_pkt))
   return -EINVAL;

  if (unlikely(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 &&
  (!QED_IS_NVMETCP_PERSONALITY(p_hwfn))) {
  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 (likely(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_TCP_ULP:
  p_ramrod->conn_type = PROTOCOLID_TCP_ULP;
  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_hwfn->hw_info.personality == QED_PCI_NVMETCP)
   p_ramrod->conn_type = PROTOCOLID_TCP_ULP;
  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, ¶ms);
 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, ¶ms);
 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,
        ¶ms);
 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 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, stats_id;

 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);
 stats_id = qed_ll2_handle_to_stats_id(p_hwfn,
           p_ll2_conn->input.rx_conn_type,
           qid);
 p_ll2_conn->queue_id = qid;
 p_ll2_conn->tx_stats_id = stats_id;

 /* If there is no valid stats id for this connection, disable stats */
 if (p_ll2_conn->tx_stats_id == QED_LL2_INVALID_STATS_ID) {
  p_ll2_conn->tx_stats_en = 0;
  DP_VERBOSE(p_hwfn,
      QED_MSG_LL2,
      "Disabling stats for queue %d - not enough counters\n",
      qid);
 }

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

 if (p_ll2_conn->input.rx_conn_type == QED_LL2_RX_TYPE_LEGACY) {
  p_rx->set_prod_addr =
      (u8 __iomem *)p_hwfn->regview +
      GET_GTT_REG_ADDR(GTT_BAR0_MAP_REG_TSDM_RAM,
         TSTORM_LL2_RX_PRODS, 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_IS_NVMETCP_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 entries, 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 (likely(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 (unlikely(!p_ll2_conn))
  return -EINVAL;
 p_tx = &p_ll2_conn->tx_queue;
 p_tx_chain = &p_tx->txq_chain;

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

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

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

 if (unlikely(!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;
}

int qed_ll2_set_fragment_of_tx_packet(void *cxt,
          u8 connection_handle,
          dma_addr_t addr, u16 nbytes)
{
 struct qed_ll2_tx_packet *p_cur_send_packet = NULL;
 struct qed_hwfn *p_hwfn = cxt;
 struct qed_ll2_info *p_ll2_conn = NULL;
 u16 cur_send_frag_num = 0;
 struct core_tx_bd *p_bd;
 unsigned long flags;

 p_ll2_conn = qed_ll2_handle_sanity(p_hwfn, connection_handle);
 if (unlikely(!p_ll2_conn))
  return -EINVAL;

 if (unlikely(!p_ll2_conn->tx_queue.cur_send_packet))
  return -EINVAL;

 p_cur_send_packet = p_ll2_conn->tx_queue.cur_send_packet;
 cur_send_frag_num = p_ll2_conn->tx_queue.cur_send_frag_num;

 if (unlikely(cur_send_frag_num >= p_cur_send_packet->bd_used))
  return -EINVAL;

 /* Fill the BD information, and possibly notify FW */
 p_bd = p_cur_send_packet->bds_set[cur_send_frag_num].txq_bd;
 DMA_REGPAIR_LE(p_bd->addr, addr);
 p_bd->nbytes = cpu_to_le16(nbytes);
 p_cur_send_packet->bds_set[cur_send_frag_num].tx_frag = addr;
 p_cur_send_packet->bds_set[cur_send_frag_num].frag_len = nbytes;

 p_ll2_conn->tx_queue.cur_send_frag_num++;

 spin_lock_irqsave(&p_ll2_conn->tx_queue.lock, flags);
 qed_ll2_tx_packet_notify(p_hwfn, p_ll2_conn);
 spin_unlock_irqrestore(&p_ll2_conn->tx_queue.lock, flags);

 return 0;
}

int qed_ll2_terminate_connection(void *cxt, u8 connection_handle)
{
 struct qed_hwfn *p_hwfn = cxt;
 struct qed_ll2_info *p_ll2_conn = NULL;
 int rc = -EINVAL;
 struct qed_ptt *p_ptt;

 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;
 }

 /* Stop Tx & Rx of connection, if needed */
 if (QED_LL2_TX_REGISTERED(p_ll2_conn)) {
  p_ll2_conn->tx_queue.b_cb_registered = false;
  smp_wmb(); /* Make sure this is seen by ll2_lb_rxq_completion */
  rc = qed_sp_ll2_tx_queue_stop(p_hwfn, p_ll2_conn);
  if (rc)
   goto out;

  qed_ll2_txq_flush(p_hwfn, connection_handle);
  qed_int_unregister_cb(p_hwfn, p_ll2_conn->tx_queue.tx_sb_index);
 }

 if (QED_LL2_RX_REGISTERED(p_ll2_conn)) {
  p_ll2_conn->rx_queue.b_cb_registered = false;
  smp_wmb(); /* Make sure this is seen by ll2_lb_rxq_completion */

  if (p_ll2_conn->rx_queue.ctx_based)
   qed_db_recovery_del(p_hwfn->cdev,
         p_ll2_conn->rx_queue.set_prod_addr,
         &p_ll2_conn->rx_queue.db_data);

  rc = qed_sp_ll2_rx_queue_stop(p_hwfn, p_ll2_conn);
  if (rc)
   goto out;

  qed_ll2_rxq_flush(p_hwfn, connection_handle);
  qed_int_unregister_cb(p_hwfn, p_ll2_conn->rx_queue.rx_sb_index);
 }

 if (p_ll2_conn->input.conn_type == QED_LL2_TYPE_OOO)
  qed_ooo_release_all_isles(p_hwfn, p_hwfn->p_ooo_info);

 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_remove_protocol_filter(p_hwfn->cdev, 0,
             QED_LLH_FILTER_ETHERTYPE,
             ETH_P_FCOE, 0);
  qed_llh_remove_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_release_connection_ooo(struct qed_hwfn *p_hwfn,
        struct qed_ll2_info *p_ll2_conn)
{
 struct qed_ooo_buffer *p_buffer;

 if (p_ll2_conn->input.conn_type != QED_LL2_TYPE_OOO)
  return;

 qed_ooo_release_all_isles(p_hwfn, p_hwfn->p_ooo_info);
 while ((p_buffer = qed_ooo_get_free_buffer(p_hwfn,
         p_hwfn->p_ooo_info))) {
  dma_free_coherent(&p_hwfn->cdev->pdev->dev,
      p_buffer->rx_buffer_size,
      p_buffer->rx_buffer_virt_addr,
      p_buffer->rx_buffer_phys_addr);
  kfree(p_buffer);
 }
}

void qed_ll2_release_connection(void *cxt, u8 connection_handle)
{
 struct qed_hwfn *p_hwfn = cxt;
 struct qed_ll2_info *p_ll2_conn = NULL;

 p_ll2_conn = qed_ll2_handle_sanity(p_hwfn, connection_handle);
 if (!p_ll2_conn)
  return;

 kfree(p_ll2_conn->tx_queue.descq_mem);
 qed_chain_free(p_hwfn->cdev, &p_ll2_conn->tx_queue.txq_chain);

 kfree(p_ll2_conn->rx_queue.descq_array);
 qed_chain_free(p_hwfn->cdev, &p_ll2_conn->rx_queue.rxq_chain);
 qed_chain_free(p_hwfn->cdev, &p_ll2_conn->rx_queue.rcq_chain);

 qed_cxt_release_cid(p_hwfn, p_ll2_conn->cid);

 qed_ll2_release_connection_ooo(p_hwfn, p_ll2_conn);

 mutex_lock(&p_ll2_conn->mutex);
 p_ll2_conn->b_active = false;
 mutex_unlock(&p_ll2_conn->mutex);
}

int qed_ll2_alloc(struct qed_hwfn *p_hwfn)
{
 struct qed_ll2_info *p_ll2_connections;
 u8 i;

 /* Allocate LL2's set struct */
 p_ll2_connections = kcalloc(QED_MAX_NUM_OF_LL2_CONNECTIONS,
        sizeof(struct qed_ll2_info), GFP_KERNEL);
 if (!p_ll2_connections) {
  DP_NOTICE(p_hwfn, "Failed to allocate `struct qed_ll2'\n");
  return -ENOMEM;
 }

 for (i = 0; i < QED_MAX_NUM_OF_LL2_CONNECTIONS; i++)
  p_ll2_connections[i].my_id = i;

 p_hwfn->p_ll2_info = p_ll2_connections;
 return 0;
}

void qed_ll2_setup(struct qed_hwfn *p_hwfn)
{
 int i;

 for (i = 0; i < QED_MAX_NUM_OF_LL2_CONNECTIONS; i++)
  mutex_init(&p_hwfn->p_ll2_info[i].mutex);
}

void qed_ll2_free(struct qed_hwfn *p_hwfn)
{
 if (!p_hwfn->p_ll2_info)
  return;

 kfree(p_hwfn->p_ll2_info);
 p_hwfn->p_ll2_info = NULL;
}

static void _qed_ll2_get_port_stats(struct qed_hwfn *p_hwfn,
        struct qed_ptt *p_ptt,
        struct qed_ll2_stats *p_stats)
{
 struct core_ll2_port_stats port_stats;

 memset(&port_stats, 0, sizeof(port_stats));
 qed_memcpy_from(p_hwfn, p_ptt, &port_stats,
   BAR0_MAP_REG_TSDM_RAM +
   TSTORM_LL2_PORT_STAT_OFFSET(MFW_PORT(p_hwfn)),
   sizeof(port_stats));

 p_stats->gsi_invalid_hdr += HILO_64_REGPAIR(port_stats.gsi_invalid_hdr);
 p_stats->gsi_invalid_pkt_length +=
     HILO_64_REGPAIR(port_stats.gsi_invalid_pkt_length);
 p_stats->gsi_unsupported_pkt_typ +=
     HILO_64_REGPAIR(port_stats.gsi_unsupported_pkt_typ);
 p_stats->gsi_crcchksm_error +=
     HILO_64_REGPAIR(port_stats.gsi_crcchksm_error);
}

static void _qed_ll2_get_tstats(struct qed_hwfn *p_hwfn,
    struct qed_ptt *p_ptt,
    struct qed_ll2_info *p_ll2_conn,
    struct qed_ll2_stats *p_stats)
{
 struct core_ll2_tstorm_per_queue_stat tstats;
 u8 qid = p_ll2_conn->queue_id;
 u32 tstats_addr;

 memset(&tstats, 0, sizeof(tstats));
 tstats_addr = BAR0_MAP_REG_TSDM_RAM +
        CORE_LL2_TSTORM_PER_QUEUE_STAT_OFFSET(qid);
 qed_memcpy_from(p_hwfn, p_ptt, &tstats, tstats_addr, sizeof(tstats));

 p_stats->packet_too_big_discard +=
   HILO_64_REGPAIR(tstats.packet_too_big_discard);
 p_stats->no_buff_discard += HILO_64_REGPAIR(tstats.no_buff_discard);
}

static void _qed_ll2_get_ustats(struct qed_hwfn *p_hwfn,
    struct qed_ptt *p_ptt,
    struct qed_ll2_info *p_ll2_conn,
    struct qed_ll2_stats *p_stats)
{
 struct core_ll2_ustorm_per_queue_stat ustats;
 u8 qid = p_ll2_conn->queue_id;
 u32 ustats_addr;

 memset(&ustats, 0, sizeof(ustats));
 ustats_addr = BAR0_MAP_REG_USDM_RAM +
        CORE_LL2_USTORM_PER_QUEUE_STAT_OFFSET(qid);
 qed_memcpy_from(p_hwfn, p_ptt, &ustats, ustats_addr, sizeof(ustats));

 p_stats->rcv_ucast_bytes += HILO_64_REGPAIR(ustats.rcv_ucast_bytes);
 p_stats->rcv_mcast_bytes += HILO_64_REGPAIR(ustats.rcv_mcast_bytes);
 p_stats->rcv_bcast_bytes += HILO_64_REGPAIR(ustats.rcv_bcast_bytes);
 p_stats->rcv_ucast_pkts += HILO_64_REGPAIR(ustats.rcv_ucast_pkts);
 p_stats->rcv_mcast_pkts += HILO_64_REGPAIR(ustats.rcv_mcast_pkts);
 p_stats->rcv_bcast_pkts += HILO_64_REGPAIR(ustats.rcv_bcast_pkts);
}

static void _qed_ll2_get_pstats(struct qed_hwfn *p_hwfn,
    struct qed_ptt *p_ptt,
    struct qed_ll2_info *p_ll2_conn,
    struct qed_ll2_stats *p_stats)
{
 struct core_ll2_pstorm_per_queue_stat pstats;
 u8 stats_id = p_ll2_conn->tx_stats_id;
 u32 pstats_addr;

 memset(&pstats, 0, sizeof(pstats));
 pstats_addr = BAR0_MAP_REG_PSDM_RAM +
        CORE_LL2_PSTORM_PER_QUEUE_STAT_OFFSET(stats_id);
 qed_memcpy_from(p_hwfn, p_ptt, &pstats, pstats_addr, sizeof(pstats));

 p_stats->sent_ucast_bytes += HILO_64_REGPAIR(pstats.sent_ucast_bytes);
 p_stats->sent_mcast_bytes += HILO_64_REGPAIR(pstats.sent_mcast_bytes);
 p_stats->sent_bcast_bytes += HILO_64_REGPAIR(pstats.sent_bcast_bytes);
 p_stats->sent_ucast_pkts += HILO_64_REGPAIR(pstats.sent_ucast_pkts);
--> --------------------

--> maximum size reached

--> --------------------