drivers/net/ethernet/qlogic/qed/qed_roce.c

/* QLogic qed NIC Driver
 * Copyright (c) 2015-2016  QLogic Corporation
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and /or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/io.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/tcp.h>
#include <linux/bitops.h>
#include <linux/qed/qed_roce_if.h>
#include <linux/qed/qed_roce_if.h>
#include "qed.h"
#include "qed_cxt.h"
#include "qed_hsi.h"
#include "qed_hw.h"
#include "qed_init_ops.h"
#include "qed_int.h"
#include "qed_ll2.h"
#include "qed_mcp.h"
#include "qed_reg_addr.h"
#include "qed_sp.h"
#include "qed_roce.h"

void qed_async_roce_event(struct qed_hwfn *p_hwfn,
			  struct event_ring_entry *p_eqe)
{
	struct qed_rdma_info *p_rdma_info = p_hwfn->p_rdma_info;

	p_rdma_info->events.affiliated_event(p_rdma_info->events.context,
					     p_eqe->opcode, &p_eqe->data);
}

static int qed_rdma_bmap_alloc(struct qed_hwfn *p_hwfn,
			       struct qed_bmap *bmap, u32 max_count)
{
	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "max_count = %08x\n", max_count);

	bmap->max_count = max_count;

	bmap->bitmap = kzalloc(BITS_TO_LONGS(max_count) * sizeof(long),
			       GFP_KERNEL);
	if (!bmap->bitmap) {
		DP_NOTICE(p_hwfn,
			  "qed bmap alloc failed: cannot allocate memory (bitmap)\n");
		return -ENOMEM;
	}

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Allocated bitmap %p\n",
		   bmap->bitmap);
	return 0;
}

static int qed_rdma_bmap_alloc_id(struct qed_hwfn *p_hwfn,
				  struct qed_bmap *bmap, u32 *id_num)
{
	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "bmap = %p\n", bmap);

	*id_num = find_first_zero_bit(bmap->bitmap, bmap->max_count);

	if (*id_num >= bmap->max_count) {
		DP_NOTICE(p_hwfn, "no id available max_count=%d\n",
			  bmap->max_count);
		return -EINVAL;
	}

	__set_bit(*id_num, bmap->bitmap);

	return 0;
}

static void qed_bmap_release_id(struct qed_hwfn *p_hwfn,
				struct qed_bmap *bmap, u32 id_num)
{
	bool b_acquired;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "id_num = %08x", id_num);
	if (id_num >= bmap->max_count)
		return;

	b_acquired = test_and_clear_bit(id_num, bmap->bitmap);
	if (!b_acquired) {
		DP_NOTICE(p_hwfn, "ID %d already released\n", id_num);
		return;
	}
}

u32 qed_rdma_get_sb_id(void *p_hwfn, u32 rel_sb_id)
{
	/* First sb id for RoCE is after all the l2 sb */
	return FEAT_NUM((struct qed_hwfn *)p_hwfn, QED_PF_L2_QUE) + rel_sb_id;
}

u32 qed_rdma_query_cau_timer_res(void *rdma_cxt)
{
	return QED_CAU_DEF_RX_TIMER_RES;
}

static int qed_rdma_alloc(struct qed_hwfn *p_hwfn,
			  struct qed_ptt *p_ptt,
			  struct qed_rdma_start_in_params *params)
{
	struct qed_rdma_info *p_rdma_info;
	u32 num_cons, num_tasks;
	int rc = -ENOMEM;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Allocating RDMA\n");

	/* Allocate a struct with current pf rdma info */
	p_rdma_info = kzalloc(sizeof(*p_rdma_info), GFP_KERNEL);
	if (!p_rdma_info) {
		DP_NOTICE(p_hwfn,
			  "qed rdma alloc failed: cannot allocate memory (rdma info). rc = %d\n",
			  rc);
		return rc;
	}

	p_hwfn->p_rdma_info = p_rdma_info;
	p_rdma_info->proto = PROTOCOLID_ROCE;

	num_cons = qed_cxt_get_proto_cid_count(p_hwfn, p_rdma_info->proto, 0);

	p_rdma_info->num_qps = num_cons / 2;

	num_tasks = qed_cxt_get_proto_tid_count(p_hwfn, PROTOCOLID_ROCE);

	/* Each MR uses a single task */
	p_rdma_info->num_mrs = num_tasks;

	/* Queue zone lines are shared between RoCE and L2 in such a way that
	 * they can be used by each without obstructing the other.
	 */
	p_rdma_info->queue_zone_base = (u16)FEAT_NUM(p_hwfn, QED_L2_QUEUE);

	/* Allocate a struct with device params and fill it */
	p_rdma_info->dev = kzalloc(sizeof(*p_rdma_info->dev), GFP_KERNEL);
	if (!p_rdma_info->dev) {
		DP_NOTICE(p_hwfn,
			  "qed rdma alloc failed: cannot allocate memory (rdma info dev). rc = %d\n",
			  rc);
		goto free_rdma_info;
	}

	/* Allocate a struct with port params and fill it */
	p_rdma_info->port = kzalloc(sizeof(*p_rdma_info->port), GFP_KERNEL);
	if (!p_rdma_info->port) {
		DP_NOTICE(p_hwfn,
			  "qed rdma alloc failed: cannot allocate memory (rdma info port). rc = %d\n",
			  rc);
		goto free_rdma_dev;
	}

	/* Allocate bit map for pd's */
	rc = qed_rdma_bmap_alloc(p_hwfn, &p_rdma_info->pd_map, RDMA_MAX_PDS);
	if (rc) {
		DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
			   "Failed to allocate pd_map, rc = %d\n",
			   rc);
		goto free_rdma_port;
	}

	/* Allocate DPI bitmap */
	rc = qed_rdma_bmap_alloc(p_hwfn, &p_rdma_info->dpi_map,
				 p_hwfn->dpi_count);
	if (rc) {
		DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
			   "Failed to allocate DPI bitmap, rc = %d\n", rc);
		goto free_pd_map;
	}

	/* Allocate bitmap for cq's. The maximum number of CQs is bounded to
	 * twice the number of QPs.
	 */
	rc = qed_rdma_bmap_alloc(p_hwfn, &p_rdma_info->cq_map,
				 p_rdma_info->num_qps * 2);
	if (rc) {
		DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
			   "Failed to allocate cq bitmap, rc = %d\n", rc);
		goto free_dpi_map;
	}

	/* Allocate bitmap for toggle bit for cq icids
	 * We toggle the bit every time we create or resize cq for a given icid.
	 * The maximum number of CQs is bounded to  twice the number of QPs.
	 */
	rc = qed_rdma_bmap_alloc(p_hwfn, &p_rdma_info->toggle_bits,
				 p_rdma_info->num_qps * 2);
	if (rc) {
		DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
			   "Failed to allocate toogle bits, rc = %d\n", rc);
		goto free_cq_map;
	}

	/* Allocate bitmap for itids */
	rc = qed_rdma_bmap_alloc(p_hwfn, &p_rdma_info->tid_map,
				 p_rdma_info->num_mrs);
	if (rc) {
		DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
			   "Failed to allocate itids bitmaps, rc = %d\n", rc);
		goto free_toggle_map;
	}

	/* Allocate bitmap for cids used for qps. */
	rc = qed_rdma_bmap_alloc(p_hwfn, &p_rdma_info->cid_map, num_cons);
	if (rc) {
		DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
			   "Failed to allocate cid bitmap, rc = %d\n", rc);
		goto free_tid_map;
	}

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Allocation successful\n");
	return 0;

free_tid_map:
	kfree(p_rdma_info->tid_map.bitmap);
free_toggle_map:
	kfree(p_rdma_info->toggle_bits.bitmap);
free_cq_map:
	kfree(p_rdma_info->cq_map.bitmap);
free_dpi_map:
	kfree(p_rdma_info->dpi_map.bitmap);
free_pd_map:
	kfree(p_rdma_info->pd_map.bitmap);
free_rdma_port:
	kfree(p_rdma_info->port);
free_rdma_dev:
	kfree(p_rdma_info->dev);
free_rdma_info:
	kfree(p_rdma_info);

	return rc;
}

void qed_rdma_resc_free(struct qed_hwfn *p_hwfn)
{
	struct qed_rdma_info *p_rdma_info = p_hwfn->p_rdma_info;

	kfree(p_rdma_info->cid_map.bitmap);
	kfree(p_rdma_info->tid_map.bitmap);
	kfree(p_rdma_info->toggle_bits.bitmap);
	kfree(p_rdma_info->cq_map.bitmap);
	kfree(p_rdma_info->dpi_map.bitmap);
	kfree(p_rdma_info->pd_map.bitmap);

	kfree(p_rdma_info->port);
	kfree(p_rdma_info->dev);

	kfree(p_rdma_info);
}

static void qed_rdma_free(struct qed_hwfn *p_hwfn)
{
	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Freeing RDMA\n");

	qed_rdma_resc_free(p_hwfn);
}

static void qed_rdma_get_guid(struct qed_hwfn *p_hwfn, u8 *guid)
{
	guid[0] = p_hwfn->hw_info.hw_mac_addr[0] ^ 2;
	guid[1] = p_hwfn->hw_info.hw_mac_addr[1];
	guid[2] = p_hwfn->hw_info.hw_mac_addr[2];
	guid[3] = 0xff;
	guid[4] = 0xfe;
	guid[5] = p_hwfn->hw_info.hw_mac_addr[3];
	guid[6] = p_hwfn->hw_info.hw_mac_addr[4];
	guid[7] = p_hwfn->hw_info.hw_mac_addr[5];
}

static void qed_rdma_init_events(struct qed_hwfn *p_hwfn,
				 struct qed_rdma_start_in_params *params)
{
	struct qed_rdma_events *events;

	events = &p_hwfn->p_rdma_info->events;

	events->unaffiliated_event = params->events->unaffiliated_event;
	events->affiliated_event = params->events->affiliated_event;
	events->context = params->events->context;
}

static void qed_rdma_init_devinfo(struct qed_hwfn *p_hwfn,
				  struct qed_rdma_start_in_params *params)
{
	struct qed_rdma_device *dev = p_hwfn->p_rdma_info->dev;
	struct qed_dev *cdev = p_hwfn->cdev;
	u32 pci_status_control;
	u32 num_qps;

	/* Vendor specific information */
	dev->vendor_id = cdev->vendor_id;
	dev->vendor_part_id = cdev->device_id;
	dev->hw_ver = 0;
	dev->fw_ver = (FW_MAJOR_VERSION << 24) | (FW_MINOR_VERSION << 16) |
		      (FW_REVISION_VERSION << 8) | (FW_ENGINEERING_VERSION);

	qed_rdma_get_guid(p_hwfn, (u8 *)&dev->sys_image_guid);
	dev->node_guid = dev->sys_image_guid;

	dev->max_sge = min_t(u32, RDMA_MAX_SGE_PER_SQ_WQE,
			     RDMA_MAX_SGE_PER_RQ_WQE);

	if (cdev->rdma_max_sge)
		dev->max_sge = min_t(u32, cdev->rdma_max_sge, dev->max_sge);

	dev->max_inline = ROCE_REQ_MAX_INLINE_DATA_SIZE;

	dev->max_inline = (cdev->rdma_max_inline) ?
			  min_t(u32, cdev->rdma_max_inline, dev->max_inline) :
			  dev->max_inline;

	dev->max_wqe = QED_RDMA_MAX_WQE;
	dev->max_cnq = (u8)FEAT_NUM(p_hwfn, QED_RDMA_CNQ);

	/* The number of QPs may be higher than QED_ROCE_MAX_QPS, because
	 * it is up-aligned to 16 and then to ILT page size within qed cxt.
	 * This is OK in terms of ILT but we don't want to configure the FW
	 * above its abilities
	 */
	num_qps = ROCE_MAX_QPS;
	num_qps = min_t(u64, num_qps, p_hwfn->p_rdma_info->num_qps);
	dev->max_qp = num_qps;

	/* CQs uses the same icids that QPs use hence they are limited by the
	 * number of icids. There are two icids per QP.
	 */
	dev->max_cq = num_qps * 2;

	/* The number of mrs is smaller by 1 since the first is reserved */
	dev->max_mr = p_hwfn->p_rdma_info->num_mrs - 1;
	dev->max_mr_size = QED_RDMA_MAX_MR_SIZE;

	/* The maximum CQE capacity per CQ supported.
	 * max number of cqes will be in two layer pbl,
	 * 8 is the pointer size in bytes
	 * 32 is the size of cq element in bytes
	 */
	if (params->cq_mode == QED_RDMA_CQ_MODE_32_BITS)
		dev->max_cqe = QED_RDMA_MAX_CQE_32_BIT;
	else
		dev->max_cqe = QED_RDMA_MAX_CQE_16_BIT;

	dev->max_mw = 0;
	dev->max_fmr = QED_RDMA_MAX_FMR;
	dev->max_mr_mw_fmr_pbl = (PAGE_SIZE / 8) * (PAGE_SIZE / 8);
	dev->max_mr_mw_fmr_size = dev->max_mr_mw_fmr_pbl * PAGE_SIZE;
	dev->max_pkey = QED_RDMA_MAX_P_KEY;

	dev->max_qp_resp_rd_atomic_resc = RDMA_RING_PAGE_SIZE /
					  (RDMA_RESP_RD_ATOMIC_ELM_SIZE * 2);
	dev->max_qp_req_rd_atomic_resc = RDMA_RING_PAGE_SIZE /
					 RDMA_REQ_RD_ATOMIC_ELM_SIZE;
	dev->max_dev_resp_rd_atomic_resc = dev->max_qp_resp_rd_atomic_resc *
					   p_hwfn->p_rdma_info->num_qps;
	dev->page_size_caps = QED_RDMA_PAGE_SIZE_CAPS;
	dev->dev_ack_delay = QED_RDMA_ACK_DELAY;
	dev->max_pd = RDMA_MAX_PDS;
	dev->max_ah = p_hwfn->p_rdma_info->num_qps;
	dev->max_stats_queues = (u8)RESC_NUM(p_hwfn, QED_RDMA_STATS_QUEUE);

	/* Set capablities */
	dev->dev_caps = 0;
	SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_RNR_NAK, 1);
	SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_PORT_ACTIVE_EVENT, 1);
	SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_PORT_CHANGE_EVENT, 1);
	SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_RESIZE_CQ, 1);
	SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_BASE_MEMORY_EXT, 1);
	SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_BASE_QUEUE_EXT, 1);
	SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_ZBVA, 1);
	SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_LOCAL_INV_FENCE, 1);

	/* Check atomic operations support in PCI configuration space. */
	pci_read_config_dword(cdev->pdev,
			      cdev->pdev->pcie_cap + PCI_EXP_DEVCTL2,
			      &pci_status_control);

	if (pci_status_control & PCI_EXP_DEVCTL2_LTR_EN)
		SET_FIELD(dev->dev_caps, QED_RDMA_DEV_CAP_ATOMIC_OP, 1);
}

static void qed_rdma_init_port(struct qed_hwfn *p_hwfn)
{
	struct qed_rdma_port *port = p_hwfn->p_rdma_info->port;
	struct qed_rdma_device *dev = p_hwfn->p_rdma_info->dev;

	port->port_state = p_hwfn->mcp_info->link_output.link_up ?
			   QED_RDMA_PORT_UP : QED_RDMA_PORT_DOWN;

	port->max_msg_size = min_t(u64,
				   (dev->max_mr_mw_fmr_size *
				    p_hwfn->cdev->rdma_max_sge),
				   BIT(31));

	port->pkey_bad_counter = 0;
}

static int qed_rdma_init_hw(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
{
	u32 ll2_ethertype_en;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Initializing HW\n");
	p_hwfn->b_rdma_enabled_in_prs = false;

	qed_wr(p_hwfn, p_ptt, PRS_REG_ROCE_DEST_QP_MAX_PF, 0);

	p_hwfn->rdma_prs_search_reg = PRS_REG_SEARCH_ROCE;

	/* We delay writing to this reg until first cid is allocated. See
	 * qed_cxt_dynamic_ilt_alloc function for more details
	 */
	ll2_ethertype_en = qed_rd(p_hwfn, p_ptt, PRS_REG_LIGHT_L2_ETHERTYPE_EN);
	qed_wr(p_hwfn, p_ptt, PRS_REG_LIGHT_L2_ETHERTYPE_EN,
	       (ll2_ethertype_en | 0x01));

	if (qed_cxt_get_proto_cid_start(p_hwfn, PROTOCOLID_ROCE) % 2) {
		DP_NOTICE(p_hwfn, "The first RoCE's cid should be even\n");
		return -EINVAL;
	}

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Initializing HW - Done\n");
	return 0;
}

static int qed_rdma_start_fw(struct qed_hwfn *p_hwfn,
			     struct qed_rdma_start_in_params *params,
			     struct qed_ptt *p_ptt)
{
	struct rdma_init_func_ramrod_data *p_ramrod;
	struct qed_rdma_cnq_params *p_cnq_pbl_list;
	struct rdma_init_func_hdr *p_params_header;
	struct rdma_cnq_params *p_cnq_params;
	struct qed_sp_init_data init_data;
	struct qed_spq_entry *p_ent;
	u32 cnq_id, sb_id;
	int rc;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Starting FW\n");

	/* Save the number of cnqs for the function close ramrod */
	p_hwfn->p_rdma_info->num_cnqs = params->desired_cnq;

	/* Get SPQ entry */
	memset(&init_data, 0, sizeof(init_data));
	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, RDMA_RAMROD_FUNC_INIT,
				 p_hwfn->p_rdma_info->proto, &init_data);
	if (rc)
		return rc;

	p_ramrod = &p_ent->ramrod.roce_init_func.rdma;

	p_params_header = &p_ramrod->params_header;
	p_params_header->cnq_start_offset = (u8)RESC_START(p_hwfn,
							   QED_RDMA_CNQ_RAM);
	p_params_header->num_cnqs = params->desired_cnq;

	if (params->cq_mode == QED_RDMA_CQ_MODE_16_BITS)
		p_params_header->cq_ring_mode = 1;
	else
		p_params_header->cq_ring_mode = 0;

	for (cnq_id = 0; cnq_id < params->desired_cnq; cnq_id++) {
		sb_id = qed_rdma_get_sb_id(p_hwfn, cnq_id);
		p_cnq_params = &p_ramrod->cnq_params[cnq_id];
		p_cnq_pbl_list = &params->cnq_pbl_list[cnq_id];
		p_cnq_params->sb_num =
			cpu_to_le16(p_hwfn->sbs_info[sb_id]->igu_sb_id);

		p_cnq_params->sb_index = p_hwfn->pf_params.rdma_pf_params.gl_pi;
		p_cnq_params->num_pbl_pages = p_cnq_pbl_list->num_pbl_pages;

		DMA_REGPAIR_LE(p_cnq_params->pbl_base_addr,
			       p_cnq_pbl_list->pbl_ptr);

		/* we assume here that cnq_id and qz_offset are the same */
		p_cnq_params->queue_zone_num =
			cpu_to_le16(p_hwfn->p_rdma_info->queue_zone_base +
				    cnq_id);
	}

	return qed_spq_post(p_hwfn, p_ent, NULL);
}

static int qed_rdma_reserve_lkey(struct qed_hwfn *p_hwfn)
{
	struct qed_rdma_device *dev = p_hwfn->p_rdma_info->dev;

	/* The first DPI is reserved for the Kernel */
	__set_bit(0, p_hwfn->p_rdma_info->dpi_map.bitmap);

	/* Tid 0 will be used as the key for "reserved MR".
	 * The driver should allocate memory for it so it can be loaded but no
	 * ramrod should be passed on it.
	 */
	qed_rdma_alloc_tid(p_hwfn, &dev->reserved_lkey);
	if (dev->reserved_lkey != RDMA_RESERVED_LKEY) {
		DP_NOTICE(p_hwfn,
			  "Reserved lkey should be equal to RDMA_RESERVED_LKEY\n");
		return -EINVAL;
	}

	return 0;
}

static int qed_rdma_setup(struct qed_hwfn *p_hwfn,
			  struct qed_ptt *p_ptt,
			  struct qed_rdma_start_in_params *params)
{
	int rc;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "RDMA setup\n");

	spin_lock_init(&p_hwfn->p_rdma_info->lock);

	qed_rdma_init_devinfo(p_hwfn, params);
	qed_rdma_init_port(p_hwfn);
	qed_rdma_init_events(p_hwfn, params);

	rc = qed_rdma_reserve_lkey(p_hwfn);
	if (rc)
		return rc;

	rc = qed_rdma_init_hw(p_hwfn, p_ptt);
	if (rc)
		return rc;

	return qed_rdma_start_fw(p_hwfn, params, p_ptt);
}

int qed_rdma_stop(void *rdma_cxt)
{
	struct qed_hwfn *p_hwfn = (struct qed_hwfn *)rdma_cxt;
	struct rdma_close_func_ramrod_data *p_ramrod;
	struct qed_sp_init_data init_data;
	struct qed_spq_entry *p_ent;
	struct qed_ptt *p_ptt;
	u32 ll2_ethertype_en;
	int rc = -EBUSY;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "RDMA stop\n");

	p_ptt = qed_ptt_acquire(p_hwfn);
	if (!p_ptt) {
		DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Failed to acquire PTT\n");
		return rc;
	}

	/* Disable RoCE search */
	qed_wr(p_hwfn, p_ptt, p_hwfn->rdma_prs_search_reg, 0);
	p_hwfn->b_rdma_enabled_in_prs = false;

	qed_wr(p_hwfn, p_ptt, PRS_REG_ROCE_DEST_QP_MAX_PF, 0);

	ll2_ethertype_en = qed_rd(p_hwfn, p_ptt, PRS_REG_LIGHT_L2_ETHERTYPE_EN);

	qed_wr(p_hwfn, p_ptt, PRS_REG_LIGHT_L2_ETHERTYPE_EN,
	       (ll2_ethertype_en & 0xFFFE));

	qed_ptt_release(p_hwfn, p_ptt);

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

	/* Stop RoCE */
	rc = qed_sp_init_request(p_hwfn, &p_ent, RDMA_RAMROD_FUNC_CLOSE,
				 p_hwfn->p_rdma_info->proto, &init_data);
	if (rc)
		goto out;

	p_ramrod = &p_ent->ramrod.rdma_close_func;

	p_ramrod->num_cnqs = p_hwfn->p_rdma_info->num_cnqs;
	p_ramrod->cnq_start_offset = (u8)RESC_START(p_hwfn, QED_RDMA_CNQ_RAM);

	rc = qed_spq_post(p_hwfn, p_ent, NULL);

out:
	qed_rdma_free(p_hwfn);

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "RDMA stop done, rc = %d\n", rc);
	return rc;
}

int qed_rdma_add_user(void *rdma_cxt,
		      struct qed_rdma_add_user_out_params *out_params)
{
	struct qed_hwfn *p_hwfn = (struct qed_hwfn *)rdma_cxt;
	u32 dpi_start_offset;
	u32 returned_id = 0;
	int rc;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Adding User\n");

	/* Allocate DPI */
	spin_lock_bh(&p_hwfn->p_rdma_info->lock);
	rc = qed_rdma_bmap_alloc_id(p_hwfn, &p_hwfn->p_rdma_info->dpi_map,
				    &returned_id);
	spin_unlock_bh(&p_hwfn->p_rdma_info->lock);

	out_params->dpi = (u16)returned_id;

	/* Calculate the corresponding DPI address */
	dpi_start_offset = p_hwfn->dpi_start_offset;

	out_params->dpi_addr = (u64)((u8 __iomem *)p_hwfn->doorbells +
				     dpi_start_offset +
				     ((out_params->dpi) * p_hwfn->dpi_size));

	out_params->dpi_phys_addr = p_hwfn->cdev->db_phys_addr +
				    dpi_start_offset +
				    ((out_params->dpi) * p_hwfn->dpi_size);

	out_params->dpi_size = p_hwfn->dpi_size;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Adding user - done, rc = %d\n", rc);
	return rc;
}

struct qed_rdma_device *qed_rdma_query_device(void *rdma_cxt)
{
	struct qed_hwfn *p_hwfn = (struct qed_hwfn *)rdma_cxt;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Query device\n");

	/* Return struct with device parameters */
	return p_hwfn->p_rdma_info->dev;
}

int qed_rdma_alloc_tid(void *rdma_cxt, u32 *itid)
{
	struct qed_hwfn *p_hwfn = (struct qed_hwfn *)rdma_cxt;
	int rc;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Allocate TID\n");

	spin_lock_bh(&p_hwfn->p_rdma_info->lock);
	rc = qed_rdma_bmap_alloc_id(p_hwfn,
				    &p_hwfn->p_rdma_info->tid_map, itid);
	spin_unlock_bh(&p_hwfn->p_rdma_info->lock);
	if (rc)
		goto out;

	rc = qed_cxt_dynamic_ilt_alloc(p_hwfn, QED_ELEM_TASK, *itid);
out:
	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Allocate TID - done, rc = %d\n", rc);
	return rc;
}

void qed_rdma_cnq_prod_update(void *rdma_cxt, u8 qz_offset, u16 prod)
{
	struct qed_hwfn *p_hwfn;
	u16 qz_num;
	u32 addr;

	p_hwfn = (struct qed_hwfn *)rdma_cxt;
	qz_num = p_hwfn->p_rdma_info->queue_zone_base + qz_offset;
	addr = GTT_BAR0_MAP_REG_USDM_RAM +
	       USTORM_COMMON_QUEUE_CONS_OFFSET(qz_num);

	REG_WR16(p_hwfn, addr, prod);

	/* keep prod updates ordered */
	wmb();
}

static int qed_fill_rdma_dev_info(struct qed_dev *cdev,
				  struct qed_dev_rdma_info *info)
{
	memset(info, 0, sizeof(*info));

	info->rdma_type = QED_RDMA_TYPE_ROCE;

	qed_fill_dev_info(cdev, &info->common);

	return 0;
}

static int qed_rdma_get_sb_start(struct qed_dev *cdev)
{
	int feat_num;

	if (cdev->num_hwfns > 1)
		feat_num = FEAT_NUM(QED_LEADING_HWFN(cdev), QED_PF_L2_QUE);
	else
		feat_num = FEAT_NUM(QED_LEADING_HWFN(cdev), QED_PF_L2_QUE) *
			   cdev->num_hwfns;

	return feat_num;
}

static int qed_rdma_get_min_cnq_msix(struct qed_dev *cdev)
{
	int n_cnq = FEAT_NUM(QED_LEADING_HWFN(cdev), QED_RDMA_CNQ);
	int n_msix = cdev->int_params.rdma_msix_cnt;

	return min_t(int, n_cnq, n_msix);
}

static int qed_rdma_set_int(struct qed_dev *cdev, u16 cnt)
{
	int limit = 0;

	/* Mark the fastpath as free/used */
	cdev->int_params.fp_initialized = cnt ? true : false;

	if (cdev->int_params.out.int_mode != QED_INT_MODE_MSIX) {
		DP_ERR(cdev,
		       "qed roce supports only MSI-X interrupts (detected %d).\n",
		       cdev->int_params.out.int_mode);
		return -EINVAL;
	} else if (cdev->int_params.fp_msix_cnt) {
		limit = cdev->int_params.rdma_msix_cnt;
	}

	if (!limit)
		return -ENOMEM;

	return min_t(int, cnt, limit);
}

static int qed_rdma_get_int(struct qed_dev *cdev, struct qed_int_info *info)
{
	memset(info, 0, sizeof(*info));

	if (!cdev->int_params.fp_initialized) {
		DP_INFO(cdev,
			"Protocol driver requested interrupt information, but its support is not yet configured\n");
		return -EINVAL;
	}

	if (cdev->int_params.out.int_mode == QED_INT_MODE_MSIX) {
		int msix_base = cdev->int_params.rdma_msix_base;

		info->msix_cnt = cdev->int_params.rdma_msix_cnt;
		info->msix = &cdev->int_params.msix_table[msix_base];

		DP_VERBOSE(cdev, QED_MSG_RDMA, "msix_cnt = %d msix_base=%d\n",
			   info->msix_cnt, msix_base);
	}

	return 0;
}

static void *qed_rdma_get_rdma_ctx(struct qed_dev *cdev)
{
	return QED_LEADING_HWFN(cdev);
}

static void qed_rdma_dpm_conf(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
{
	u32 val;

	val = (p_hwfn->dcbx_no_edpm || p_hwfn->db_bar_no_edpm) ? 0 : 1;

	qed_wr(p_hwfn, p_ptt, DORQ_REG_PF_DPM_ENABLE, val);
	DP_VERBOSE(p_hwfn, (QED_MSG_DCB | QED_MSG_RDMA),
		   "Changing DPM_EN state to %d (DCBX=%d, DB_BAR=%d)\n",
		   val, p_hwfn->dcbx_no_edpm, p_hwfn->db_bar_no_edpm);
}

void qed_rdma_dpm_bar(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
{
	p_hwfn->db_bar_no_edpm = true;

	qed_rdma_dpm_conf(p_hwfn, p_ptt);
}

int qed_rdma_start(void *rdma_cxt, struct qed_rdma_start_in_params *params)
{
	struct qed_hwfn *p_hwfn = (struct qed_hwfn *)rdma_cxt;
	struct qed_ptt *p_ptt;
	int rc = -EBUSY;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA,
		   "desired_cnq = %08x\n", params->desired_cnq);

	p_ptt = qed_ptt_acquire(p_hwfn);
	if (!p_ptt)
		goto err;

	rc = qed_rdma_alloc(p_hwfn, p_ptt, params);
	if (rc)
		goto err1;

	rc = qed_rdma_setup(p_hwfn, p_ptt, params);
	if (rc)
		goto err2;

	qed_ptt_release(p_hwfn, p_ptt);

	return rc;

err2:
	qed_rdma_free(p_hwfn);
err1:
	qed_ptt_release(p_hwfn, p_ptt);
err:
	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "RDMA start - error, rc = %d\n", rc);
	return rc;
}

static int qed_rdma_init(struct qed_dev *cdev,
			 struct qed_rdma_start_in_params *params)
{
	return qed_rdma_start(QED_LEADING_HWFN(cdev), params);
}

void qed_rdma_remove_user(void *rdma_cxt, u16 dpi)
{
	struct qed_hwfn *p_hwfn = (struct qed_hwfn *)rdma_cxt;

	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "dpi = %08x\n", dpi);

	spin_lock_bh(&p_hwfn->p_rdma_info->lock);
	qed_bmap_release_id(p_hwfn, &p_hwfn->p_rdma_info->dpi_map, dpi);
	spin_unlock_bh(&p_hwfn->p_rdma_info->lock);
}

static const struct qed_rdma_ops qed_rdma_ops_pass = {
	.common = &qed_common_ops_pass,
	.fill_dev_info = &qed_fill_rdma_dev_info,
	.rdma_get_rdma_ctx = &qed_rdma_get_rdma_ctx,
	.rdma_init = &qed_rdma_init,
	.rdma_add_user = &qed_rdma_add_user,
	.rdma_remove_user = &qed_rdma_remove_user,
	.rdma_stop = &qed_rdma_stop,
	.rdma_query_device = &qed_rdma_query_device,
	.rdma_get_start_sb = &qed_rdma_get_sb_start,
	.rdma_get_rdma_int = &qed_rdma_get_int,
	.rdma_set_rdma_int = &qed_rdma_set_int,
	.rdma_get_min_cnq_msix = &qed_rdma_get_min_cnq_msix,
	.rdma_cnq_prod_update = &qed_rdma_cnq_prod_update,
};

const struct qed_rdma_ops *qed_get_rdma_ops()
{
	return &qed_rdma_ops_pass;
}
EXPORT_SYMBOL(qed_get_rdma_ops);