path: root/drivers/net/ethernet/qlogic/qed/qed_roce.c

/* QLogic qed NIC Driver
 * Copyright (c) 2015-2017  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/io.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/if_vlan.h>
#include "qed.h"
#include "qed_cxt.h"
#include "qed_dcbx.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 <linux/qed/qed_rdma_if.h>
#include "qed_rdma.h"
#include "qed_roce.h"
#include "qed_sp.h"

static void qed_roce_free_real_icid(struct qed_hwfn *p_hwfn, u16 icid);

static int
qed_roce_async_event(struct qed_hwfn *p_hwfn,
		     u8 fw_event_code,
		     u16 echo, union event_ring_data *data, u8 fw_return_code)
{
	struct qed_rdma_events events = p_hwfn->p_rdma_info->events;

	if (fw_event_code == ROCE_ASYNC_EVENT_DESTROY_QP_DONE) {
		u16 icid =
		    (u16)le32_to_cpu(data->rdma_data.rdma_destroy_qp_data.cid);

		/* icid release in this async event can occur only if the icid
		 * was offloaded to the FW. In case it wasn't offloaded this is
		 * handled in qed_roce_sp_destroy_qp.
		 */
		qed_roce_free_real_icid(p_hwfn, icid);
	} else {
		if (fw_event_code == ROCE_ASYNC_EVENT_SRQ_EMPTY ||
		    fw_event_code == ROCE_ASYNC_EVENT_SRQ_LIMIT) {
			u16 srq_id = (u16)data->rdma_data.async_handle.lo;

			events.affiliated_event(events.context, fw_event_code,
						&srq_id);
		} else {
			union rdma_eqe_data rdata = data->rdma_data;

			events.affiliated_event(events.context, fw_event_code,
						(void *)&rdata.async_handle);
		}
	}

	return 0;
}

void qed_roce_stop(struct qed_hwfn *p_hwfn)
{
	struct qed_bmap *rcid_map = &p_hwfn->p_rdma_info->real_cid_map;
	int wait_count = 0;

	/* when destroying a_RoCE QP the control is returned to the user after
	 * the synchronous part. The asynchronous part may take a little longer.
	 * We delay for a short while if an async destroy QP is still expected.
	 * Beyond the added delay we clear the bitmap anyway.
	 */
	while (bitmap_weight(rcid_map->bitmap, rcid_map->max_count)) {
		msleep(100);
		if (wait_count++ > 20) {
			DP_NOTICE(p_hwfn, "cid bitmap wait timed out\n");
			break;
		}
	}
	qed_spq_unregister_async_cb(p_hwfn, PROTOCOLID_ROCE);
}

static void qed_rdma_copy_gids(struct qed_rdma_qp *qp, __le32 *src_gid,
			       __le32 *dst_gid)
{
	u32 i;

	if (qp->roce_mode == ROCE_V2_IPV4) {
		/* The IPv4 addresses shall be aligned to the highest word.
		 * The lower words must be zero.
		 */
		memset(src_gid, 0, sizeof(union qed_gid));
		memset(dst_gid, 0, sizeof(union qed_gid));
		src_gid[3] = cpu_to_le32(qp->sgid.ipv4_addr);
		dst_gid[3] = cpu_to_le32(qp->dgid.ipv4