drivers/net/mlx4/fw.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc.  All rights reserved.
 *
 * 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/mlx4/cmd.h>

#include "fw.h"
#include "icm.h"

enum {
	MLX4_COMMAND_INTERFACE_MIN_REV		= 2,
	MLX4_COMMAND_INTERFACE_MAX_REV		= 3,
	MLX4_COMMAND_INTERFACE_NEW_PORT_CMDS	= 3,
};

extern void __buggy_use_of_MLX4_GET(void);
extern void __buggy_use_of_MLX4_PUT(void);

static int enable_qos;
module_param(enable_qos, bool, 0444);
MODULE_PARM_DESC(enable_qos, "Enable Quality of Service support in the HCA (default: off)");

#define MLX4_GET(dest, source, offset)				      \
	do {							      \
		void *__p = (char *) (source) + (offset);	      \
		switch (sizeof (dest)) {			      \
		case 1: (dest) = *(u8 *) __p;	    break;	      \
		case 2: (dest) = be16_to_cpup(__p); break;	      \
		case 4: (dest) = be32_to_cpup(__p); break;	      \
		case 8: (dest) = be64_to_cpup(__p); break;	      \
		default: __buggy_use_of_MLX4_GET();		      \
		}						      \
	} while (0)

#define MLX4_PUT(dest, source, offset)				      \
	do {							      \
		void *__d = ((char *) (dest) + (offset));	      \
		switch (sizeof(source)) {			      \
		case 1: *(u8 *) __d = (source);		       break; \
		case 2:	*(__be16 *) __d = cpu_to_be16(source); break; \
		case 4:	*(__be32 *) __d = cpu_to_be32(source); break; \
		case 8:	*(__be64 *) __d = cpu_to_be64(source); break; \
		default: __buggy_use_of_MLX4_PUT();		      \
		}						      \
	} while (0)

static void dump_dev_cap_flags(struct mlx4_dev *dev, u32 flags)
{
	static const char *fname[] = {
		[ 0] = "RC transport",
		[ 1] = "UC transport",
		[ 2] = "UD transport",
		[ 3] = "XRC transport",
		[ 4] = "reliable multicast",
		[ 5] = "FCoIB support",
		[ 6] = "SRQ support",
		[ 7] = "IPoIB checksum offload",
		[ 8] = "P_Key violation counter",
		[ 9] = "Q_Key violation counter",
		[10] = "VMM",
		[16] = "MW support",
		[17] = "APM support",
		[18] = "Atomic ops support",
		[19] = "Raw multicast support",
		[20] = "Address vector port checking support",
		[21] = "UD multicast support",
		[24] = "Demand paging support",
		[25] = "Router support"
	};
	int i;

	mlx4_dbg(dev, "DEV_CAP flags:\n");
	for (i = 0; i < ARRAY_SIZE(fname); ++i)
		if (fname[i] && (flags & (1 << i)))
			mlx4_dbg(dev, "    %s\n", fname[i]);
}

int mlx4_MOD_STAT_CFG(struct mlx4_dev *dev, struct mlx4_mod_stat_cfg *cfg)
{
	struct mlx4_cmd_mailbox *mailbox;
	u32 *inbox;
	int err = 0;

#define MOD_STAT_CFG_IN_SIZE		0x100

#define MOD_STAT_CFG_PG_SZ_M_OFFSET	0x002
#define MOD_STAT_CFG_PG_SZ_OFFSET	0x003

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	inbox = mailbox->buf;

	memset(inbox, 0, MOD_STAT_CFG_IN_SIZE);

	MLX4_PUT(inbox, cfg->log_pg_sz, MOD_STAT_CFG_PG_SZ_OFFSET);
	MLX4_PUT(inbox, cfg->log_pg_sz_m, MOD_STAT_CFG_PG_SZ_M_OFFSET);

	err = mlx4_cmd(dev, mailbox->dma, 0, 0, MLX4_CMD_MOD_STAT_CFG,
			MLX4_CMD_TIME_CLASS_A);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
{
	struct mlx4_cmd_mailbox *mailbox;
	u32 *outbox;
	u8 field;
	u16 size;
	u16 stat_rate;
	int err;
	int i;

#define QUERY_DEV_CAP_OUT_SIZE		       0x100
#define QUERY_DEV_CAP_MAX_SRQ_SZ_OFFSET		0x10
#define QUERY_DEV_CAP_MAX_QP_SZ_OFFSET		0x11
#define QUERY_DEV_CAP_RSVD_QP_OFFSET		0x12
#define QUERY_DEV_CAP_MAX_QP_OFFSET		0x13
#define QUERY_DEV_CAP_RSVD_SRQ_OFFSET		0x14
#define QUERY_DEV_CAP_MAX_SRQ_OFFSET		0x15
#define QUERY_DEV_CAP_RSVD_EEC_OFFSET		0x16
#define QUERY_DEV_CAP_MAX_EEC_OFFSET		0x17
#define QUERY_DEV_CAP_MAX_CQ_SZ_OFFSET		0x19
#define QUERY_DEV_CAP_RSVD_CQ_OFFSET		0x1a
#define QUERY_DEV_CAP_MAX_CQ_OFFSET		0x1b
#define QUERY_DEV_CAP_MAX_MPT_OFFSET		0x1d
#define QUERY_DEV_CAP_RSVD_EQ_OFFSET		0x1e
#define QUERY_DEV_CAP_MAX_EQ_OFFSET		0x1f
#define QUERY_DEV_CAP_RSVD_MTT_OFFSET		0x20
#define QUERY_DEV_CAP_MAX_MRW_SZ_OFFSET		0x21
#define QUERY_DEV_CAP_RSVD_MRW_OFFSET		0x22
#define QUERY_DEV_CAP_MAX_MTT_SEG_OFFSET	0x23
#define QUERY_DEV_CAP_MAX_AV_OFFSET		0x27
#define QUERY_DEV_CAP_MAX_REQ_QP_OFFSET		0x29
#define QUERY_DEV_CAP_MAX_RES_QP_OFFSET		0x2b
#define QUERY_DEV_CAP_MAX_GSO_OFFSET		0x2d
#define QUERY_DEV_CAP_MAX_RDMA_OFFSET		0x2f
#define QUERY_DEV_CAP_RSZ_SRQ_OFFSET		0x33
#define QUERY_DEV_CAP_ACK_DELAY_OFFSET		0x35
#define QUERY_DEV_CAP_MTU_WIDTH_OFFSET		0x36
#define QUERY_DEV_CAP_VL_PORT_OFFSET		0x37
#define QUERY_DEV_CAP_MAX_MSG_SZ_OFFSET		0x38
#define QUERY_DEV_CAP_MAX_GID_OFFSET		0x3b
#define QUERY_DEV_CAP_RATE_SUPPORT_OFFSET	0x3c
#define QUERY_DEV_CAP_MAX_PKEY_OFFSET		0x3f
#define QUERY_DEV_CAP_FLAGS_OFFSET		0x44
#define QUERY_DEV_CAP_RSVD_UAR_OFFSET		0x48
#define QUERY_DEV_CAP_UAR_SZ_OFFSET		0x49
#define QUERY_DEV_CAP_PAGE_SZ_OFFSET		0x4b
#define QUERY_DEV_CAP_BF_OFFSET			0x4c
#define QUERY_DEV_CAP_LOG_BF_REG_SZ_OFFSET	0x4d
#define QUERY_DEV_CAP_LOG_MAX_BF_REGS_PER_PAGE_OFFSET	0x4e
#define QUERY_DEV_CAP_LOG_MAX_BF_PAGES_OFFSET	0x4f
#define QUERY_DEV_CAP_MAX_SG_SQ_OFFSET		0x51
#define QUERY_DEV_CAP_MAX_DESC_SZ_SQ_OFFSET	0x52
#define QUERY_DEV_CAP_MAX_SG_RQ_OFFSET		0x55
#define QUERY_DEV_CAP_MAX_DESC_SZ_RQ_OFFSET	0x56
#define QUERY_DEV_CAP_MAX_QP_MCG_OFFSET		0x61
#define QUERY_DEV_CAP_RSVD_MCG_OFFSET		0x62
#define QUERY_DEV_CAP_MAX_MCG_OFFSET		0x63
#define QUERY_DEV_CAP_RSVD_PD_OFFSET		0x64
#define QUERY_DEV_CAP_MAX_PD_OFFSET		0x65
#define QUERY_DEV_CAP_RDMARC_ENTRY_SZ_OFFSET	0x80
#define QUERY_DEV_CAP_QPC_ENTRY_SZ_OFFSET	0x82
#define QUERY_DEV_CAP_AUX_ENTRY_SZ_OFFSET	0x84
#define QUERY_DEV_CAP_ALTC_ENTRY_SZ_OFFSET	0x86
#define QUERY_DEV_CAP_EQC_ENTRY_SZ_OFFSET	0x88
#define QUERY_DEV_CAP_CQC_ENTRY_SZ_OFFSET	0x8a
#define QUERY_DEV_CAP_SRQ_ENTRY_SZ_OFFSET	0x8c
#define QUERY_DEV_CAP_C_MPT_ENTRY_SZ_OFFSET	0x8e
#define QUERY_DEV_CAP_MTT_ENTRY_SZ_OFFSET	0x90
#define QUERY_DEV_CAP_D_MPT_ENTRY_SZ_OFFSET	0x92
#define QUERY_DEV_CAP_BMME_FLAGS_OFFSET		0x94
#define QUERY_DEV_CAP_RSVD_LKEY_OFFSET		0x98
#define QUERY_DEV_CAP_MAX_ICM_SZ_OFFSET		0xa0

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	outbox = mailbox->buf;

	err = mlx4_cmd_box(dev, 0, mailbox->dma, 0, 0, MLX4_CMD_QUERY_DEV_CAP,
			   MLX4_CMD_TIME_CLASS_A);
	if (err)
		goto out;

	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_QP_OFFSET);
	dev_cap->reserved_qps = 1 << (field & 0xf);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_QP_OFFSET);
	dev_cap->max_qps = 1 << (field & 0x1f);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_SRQ_OFFSET);
	dev_cap->reserved_srqs = 1 << (field >> 4);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_SRQ_OFFSET);
	dev_cap->max_srqs = 1 << (field & 0x1f);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_CQ_SZ_OFFSET);
	dev_cap->max_cq_sz = 1 << field;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_CQ_OFFSET);
	dev_cap->reserved_cqs = 1 << (field & 0xf);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_CQ_OFFSET);
	dev_cap->max_cqs = 1 << (field & 0x1f);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_MPT_OFFSET);
	dev_cap->max_mpts = 1 << (field & 0x3f);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_EQ_OFFSET);
	dev_cap->reserved_eqs = 1 << (field & 0xf);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_EQ_OFFSET);
	dev_cap->max_eqs = 1 << (field & 0xf);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_MTT_OFFSET);
	dev_cap->reserved_mtts = 1 << (field >> 4);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_MRW_SZ_OFFSET);
	dev_cap->max_mrw_sz = 1 << field;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_MRW_OFFSET);
	dev_cap->reserved_mrws = 1 << (field & 0xf);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_MTT_SEG_OFFSET);
	dev_cap->max_mtt_seg = 1 << (field & 0x3f);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_REQ_QP_OFFSET);
	dev_cap->max_requester_per_qp = 1 << (field & 0x3f);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_RES_QP_OFFSET);
	dev_cap->max_responder_per_qp = 1 << (field & 0x3f);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_GSO_OFFSET);
	field &= 0x1f;
	if (!field)
		dev_cap->max_gso_sz = 0;
	else
		dev_cap->max_gso_sz = 1 << field;

	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_RDMA_OFFSET);
	dev_cap->max_rdma_global = 1 << (field & 0x3f);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_ACK_DELAY_OFFSET);
	dev_cap->local_ca_ack_delay = field & 0x1f;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_VL_PORT_OFFSET);
	dev_cap->num_ports = field & 0xf;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_MSG_SZ_OFFSET);
	dev_cap->max_msg_sz = 1 << (field & 0x1f);
	MLX4_GET(stat_rate, outbox, QUERY_DEV_CAP_RATE_SUPPORT_OFFSET);
	dev_cap->stat_rate_support = stat_rate;
	MLX4_GET(dev_cap->flags, outbox, QUERY_DEV_CAP_FLAGS_OFFSET);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_UAR_OFFSET);
	dev_cap->reserved_uars = field >> 4;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_UAR_SZ_OFFSET);
	dev_cap->uar_size = 1 << ((field & 0x3f) + 20);
	MLX4_GET(field, outbox, QUERY_DEV_CAP_PAGE_SZ_OFFSET);
	dev_cap->min_page_sz = 1 << field;

	MLX4_GET(field, outbox, QUERY_DEV_CAP_BF_OFFSET);
	if (field & 0x80) {
		MLX4_GET(field, outbox, QUERY_DEV_CAP_LOG_BF_REG_SZ_OFFSET);
		dev_cap->bf_reg_size = 1 << (field & 0x1f);
		MLX4_GET(field, outbox, QUERY_DEV_CAP_LOG_MAX_BF_REGS_PER_PAGE_OFFSET);
		dev_cap->bf_regs_per_page = 1 << (field & 0x3f);
		mlx4_dbg(dev, "BlueFlame available (reg size %d, regs/page %d)\n",
			 dev_cap->bf_reg_size, dev_cap->bf_regs_per_page);
	} else {
		dev_cap->bf_reg_size = 0;
		mlx4_dbg(dev, "BlueFlame not available\n");
	}

	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_SG_SQ_OFFSET);
	dev_cap->max_sq_sg = field;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_MAX_DESC_SZ_SQ_OFFSET);
	dev_cap->max_sq_desc_sz = size;

	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_QP_MCG_OFFSET);
	dev_cap->max_qp_per_mcg = 1 << field;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_MCG_OFFSET);
	dev_cap->reserved_mgms = field & 0xf;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_MCG_OFFSET);
	dev_cap->max_mcgs = 1 << field;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_PD_OFFSET);
	dev_cap->reserved_pds = field >> 4;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_PD_OFFSET);
	dev_cap->max_pds = 1 << (field & 0x3f);

	MLX4_GET(size, outbox, QUERY_DEV_CAP_RDMARC_ENTRY_SZ_OFFSET);
	dev_cap->rdmarc_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_QPC_ENTRY_SZ_OFFSET);
	dev_cap->qpc_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_AUX_ENTRY_SZ_OFFSET);
	dev_cap->aux_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_ALTC_ENTRY_SZ_OFFSET);
	dev_cap->altc_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_EQC_ENTRY_SZ_OFFSET);
	dev_cap->eqc_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_CQC_ENTRY_SZ_OFFSET);
	dev_cap->cqc_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_SRQ_ENTRY_SZ_OFFSET);
	dev_cap->srq_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_C_MPT_ENTRY_SZ_OFFSET);
	dev_cap->cmpt_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_MTT_ENTRY_SZ_OFFSET);
	dev_cap->mtt_entry_sz = size;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_D_MPT_ENTRY_SZ_OFFSET);
	dev_cap->dmpt_entry_sz = size;

	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_SRQ_SZ_OFFSET);
	dev_cap->max_srq_sz = 1 << field;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_QP_SZ_OFFSET);
	dev_cap->max_qp_sz = 1 << field;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSZ_SRQ_OFFSET);
	dev_cap->resize_srq = field & 1;
	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_SG_RQ_OFFSET);
	dev_cap->max_rq_sg = field;
	MLX4_GET(size, outbox, QUERY_DEV_CAP_MAX_DESC_SZ_RQ_OFFSET);
	dev_cap->max_rq_desc_sz = size;

	MLX4_GET(dev_cap->bmme_flags, outbox,
		 QUERY_DEV_CAP_BMME_FLAGS_OFFSET);
	MLX4_GET(dev_cap->reserved_lkey, outbox,
		 QUERY_DEV_CAP_RSVD_LKEY_OFFSET);
	MLX4_GET(dev_cap->max_icm_sz, outbox,
		 QUERY_DEV_CAP_MAX_ICM_SZ_OFFSET);

	if (dev->flags & MLX4_FLAG_OLD_PORT_CMDS) {
		for (i = 1; i <= dev_cap->num_ports; ++i) {
			MLX4_GET(field, outbox, QUERY_DEV_CAP_VL_PORT_OFFSET);
			dev_cap->max_vl[i]	   = field >> 4;
			MLX4_GET(field, outbox, QUERY_DEV_CAP_MTU_WIDTH_OFFSET);
			dev_cap->max_mtu[i]	   = field >> 4;
			dev_cap->max_port_width[i] = field & 0xf;
			MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_GID_OFFSET);
			dev_cap->max_gids[i]	   = 1 << (field & 0xf);
			MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_PKEY_OFFSET);
			dev_cap->max_pkeys[i]	   = 1 << (field & 0xf);
		}
	} else {
#define QUERY_PORT_MTU_OFFSET			0x01
#define QUERY_PORT_WIDTH_OFFSET			0x06
#define QUERY_PORT_MAX_GID_PKEY_OFFSET		0x07
#define QUERY_PORT_MAX_VL_OFFSET		0x0b

		for (i = 1; i <= dev_cap->num_ports; ++i) {
			err = mlx4_cmd_box(dev, 0, mailbox->dma, i, 0, MLX4_CMD_QUERY_PORT,
					   MLX4_CMD_TIME_CLASS_B);
			if (err)
				goto out;

			MLX4_GET(field, outbox, QUERY_PORT_MTU_OFFSET);
			dev_cap->max_mtu[i]	   = field & 0xf;
			MLX4_GET(field, outbox, QUERY_PORT_WIDTH_OFFSET);
			dev_cap->max_port_width[i] = field & 0xf;
			MLX4_GET(field, outbox, QUERY_PORT_MAX_GID_PKEY_OFFSET);
			dev_cap->max_gids[i]	   = 1 << (field >> 4);
			dev_cap->max_pkeys[i]	   = 1 << (field & 0xf);
			MLX4_GET(field, outbox, QUERY_PORT_MAX_VL_OFFSET);
			dev_cap->max_vl[i]	   = field & 0xf;
		}
	}

	mlx4_dbg(dev, "Base MM extensions: flags %08x, rsvd L_Key %08x\n",
		 dev_cap->bmme_flags, dev_cap->reserved_lkey);

	/*
	 * Each UAR has 4 EQ doorbells; so if a UAR is reserved, then
	 * we can't use any EQs whose doorbell falls on that page,
	 * even if the EQ itself isn't reserved.
	 */
	dev_cap->reserved_eqs = max(dev_cap->reserved_uars * 4,
				    dev_cap->reserved_eqs);

	mlx4_dbg(dev, "Max ICM size %lld MB\n",
		 (unsigned long long) dev_cap->max_icm_sz >> 20);
	mlx4_dbg(dev, "Max QPs: %d, reserved QPs: %d, entry size: %d\n",
		 dev_cap->max_qps, dev_cap->reserved_qps, dev_cap->qpc_entry_sz);
	mlx4_dbg(dev, "Max SRQs: %d, reserved SRQs: %d, entry size: %d\n",
		 dev_cap->max_srqs, dev_cap->reserved_srqs, dev_cap->srq_entry_sz);
	mlx4_dbg(dev, "Max CQs: %d, reserved CQs: %d, entry size: %d\n",
		 dev_cap->max_cqs, dev_cap->reserved_cqs, dev_cap->cqc_entry_sz);
	mlx4_dbg(dev, "Max EQs: %d, reserved EQs: %d, entry size: %d\n",
		 dev_cap->max_eqs, dev_cap->reserved_eqs, dev_cap->eqc_entry_sz);
	mlx4_dbg(dev, "reserved MPTs: %d, reserved MTTs: %d\n",
		 dev_cap->reserved_mrws, dev_cap->reserved_mtts);
	mlx4_dbg(dev, "Max PDs: %d, reserved PDs: %d, reserved UARs: %d\n",
		 dev_cap->max_pds, dev_cap->reserved_pds, dev_cap->reserved_uars);
	mlx4_dbg(dev, "Max QP/MCG: %d, reserved MGMs: %d\n",
		 dev_cap->max_pds, dev_cap->reserved_mgms);
	mlx4_dbg(dev, "Max CQEs: %d, max WQEs: %d, max SRQ WQEs: %d\n",
		 dev_cap->max_cq_sz, dev_cap->max_qp_sz, dev_cap->max_srq_sz);
	mlx4_dbg(dev, "Local CA ACK delay: %d, max MTU: %d, port width cap: %d\n",
		 dev_cap->local_ca_ack_delay, 128 << dev_cap->max_mtu[1],
		 dev_cap->max_port_width[1]);
	mlx4_dbg(dev, "Max SQ desc size: %d, max SQ S/G: %d\n",
		 dev_cap->max_sq_desc_sz, dev_cap->max_sq_sg);
	mlx4_dbg(dev, "Max RQ desc size: %d, max RQ S/G: %d\n",
		 dev_cap->max_rq_desc_sz, dev_cap->max_rq_sg);
	mlx4_dbg(dev, "Max GSO size: %d\n", dev_cap->max_gso_sz);

	dump_dev_cap_flags(dev, dev_cap->flags);

out:
	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

int mlx4_map_cmd(struct mlx4_dev *dev, u16 op, struct mlx4_icm *icm, u64 virt)
{
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_icm_iter iter;
	__be64 *pages;
	int lg;
	int nent = 0;
	int i;
	int err = 0;
	int ts = 0, tc = 0;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	memset(mailbox->buf, 0, MLX4_MAILBOX_SIZE);
	pages = mailbox->buf;

	for (mlx4_icm_first(icm, &iter);
	     !mlx4_icm_last(&iter);
	     mlx4_icm_next(&iter)) {
		/*
		 * We have to pass pages that are aligned to their
		 * size, so find the least significant 1 in the
		 * address or size and use that as our log2 size.
		 */
		lg = ffs(mlx4_icm_addr(&iter) | mlx4_icm_size(&iter)) - 1;
		if (lg < MLX4_ICM_PAGE_SHIFT) {
			mlx4_warn(dev, "Got FW area not aligned to %d (%llx/%lx).\n",
				   MLX4_ICM_PAGE_SIZE,
				   (unsigned long long) mlx4_icm_addr(&iter),
				   mlx4_icm_size(&iter));
			err = -EINVAL;
			goto out;
		}

		for (i = 0; i < mlx4_icm_size(&iter) >> lg; ++i) {
			if (virt != -1) {
				pages[nent * 2] = cpu_to_be64(virt);
				virt += 1 << lg;
			}

			pages[nent * 2 + 1] =
				cpu_to_be64((mlx4_icm_addr(&iter) + (i << lg)) |
					    (lg - MLX4_ICM_PAGE_SHIFT));
			ts += 1 << (lg - 10);
			++tc;

			if (++nent == MLX4_MAILBOX_SIZE / 16) {
				err = mlx4_cmd(dev, mailbox->dma, nent, 0, op,
						MLX4_CMD_TIME_CLASS_B);
				if (err)
					goto out;
				nent = 0;
			}
		}
	}

	if (nent)
		err = mlx4_cmd(dev, mailbox->dma, nent, 0, op, MLX4_CMD_TIME_CLASS_B);
	if (err)
		goto out;

	switch (op) {
	case MLX4_CMD_MAP_FA:
		mlx4_dbg(dev, "Mapped %d chunks/%d KB for FW.\n", tc, ts);
		break;
	case MLX4_CMD_MAP_ICM_AUX:
		mlx4_dbg(dev, "Mapped %d chunks/%d KB for ICM aux.\n", tc, ts);
		break;
	case MLX4_CMD_MAP_ICM:
		mlx4_dbg(dev, "Mapped %d chunks/%d KB at %llx for ICM.\n",
			  tc, ts, (unsigned long long) virt - (ts << 10));
		break;
	}

out:
	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

int mlx4_MAP_FA(struct mlx4_dev *dev, struct mlx4_icm *icm)
{
	return mlx4_map_cmd(dev, MLX4_CMD_MAP_FA, icm, -1);
}

int mlx4_UNMAP_FA(struct mlx4_dev *dev)
{
	return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_FA, MLX4_CMD_TIME_CLASS_B);
}


int mlx4_RUN_FW(struct mlx4_dev *dev)
{
	return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_RUN_FW, MLX4_CMD_TIME_CLASS_A);
}

int mlx4_QUERY_FW(struct mlx4_dev *dev)
{
	struct mlx4_fw  *fw  = &mlx4_priv(dev)->fw;
	struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
	struct mlx4_cmd_mailbox *mailbox;
	u32 *outbox;
	int err = 0;
	u64 fw_ver;
	u16 cmd_if_rev;
	u8 lg;

#define QUERY_FW_OUT_SIZE             0x100
#define QUERY_FW_VER_OFFSET            0x00
#define QUERY_FW_CMD_IF_REV_OFFSET     0x0a
#define QUERY_FW_MAX_CMD_OFFSET        0x0f
#define QUERY_FW_ERR_START_OFFSET      0x30
#define QUERY_FW_ERR_SIZE_OFFSET       0x38
#define QUERY_FW_ERR_BAR_OFFSET        0x3c

#define QUERY_FW_SIZE_OFFSET           0x00
#define QUERY_FW_CLR_INT_BASE_OFFSET   0x20
#define QUERY_FW_CLR_INT_BAR_OFFSET    0x28

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	outbox = mailbox->buf;

	err = mlx4_cmd_box(dev, 0, mailbox->dma, 0, 0, MLX4_CMD_QUERY_FW,
			    MLX4_CMD_TIME_CLASS_A);
	if (err)
		goto out;

	MLX4_GET(fw_ver, outbox, QUERY_FW_VER_OFFSET);
	/*
	 * FW subminor version is at more significant bits than minor
	 * version, so swap here.
	 */
	dev->caps.fw_ver = (fw_ver & 0xffff00000000ull) |
		((fw_ver & 0xffff0000ull) >> 16) |
		((fw_ver & 0x0000ffffull) << 16);

	MLX4_GET(cmd_if_rev, outbox, QUERY_FW_CMD_IF_REV_OFFSET);
	if (cmd_if_rev < MLX4_COMMAND_INTERFACE_MIN_REV ||
	    cmd_if_rev > MLX4_COMMAND_INTERFACE_MAX_REV) {
		mlx4_err(dev, "Installed FW has unsupported "
			 "command interface revision %d.\n",
			 cmd_if_rev);
		mlx4_err(dev, "(Installed FW version is %d.%d.%03d)\n",
			 (int) (dev->caps.fw_ver >> 32),
			 (int) (dev->caps.fw_ver >> 16) & 0xffff,
			 (int) dev->caps.fw_ver & 0xffff);
		mlx4_err(dev, "This driver version supports only revisions %d to %d.\n",
			 MLX4_COMMAND_INTERFACE_MIN_REV, MLX4_COMMAND_INTERFACE_MAX_REV);
		err = -ENODEV;
		goto out;
	}

	if (cmd_if_rev < MLX4_COMMAND_INTERFACE_NEW_PORT_CMDS)
		dev->flags |= MLX4_FLAG_OLD_PORT_CMDS;

	MLX4_GET(lg, outbox, QUERY_FW_MAX_CMD_OFFSET);
	cmd->max_cmds = 1 << lg;

	mlx4_dbg(dev, "FW version %d.%d.%03d (cmd intf rev %d), max commands %d\n",
		 (int) (dev->caps.fw_ver >> 32),
		 (int) (dev->caps.fw_ver >> 16) & 0xffff,
		 (int) dev->caps.fw_ver & 0xffff,
		 cmd_if_rev, cmd->max_cmds);

	MLX4_GET(fw->catas_offset, outbox, QUERY_FW_ERR_START_OFFSET);
	MLX4_GET(fw->catas_size,   outbox, QUERY_FW_ERR_SIZE_OFFSET);
	MLX4_GET(fw->catas_bar,    outbox, QUERY_FW_ERR_BAR_OFFSET);
	fw->catas_bar = (fw->catas_bar >> 6) * 2;

	mlx4_dbg(dev, "Catastrophic error buffer at 0x%llx, size 0x%x, BAR %d\n",
		 (unsigned long long) fw->catas_offset, fw->catas_size, fw->catas_bar);

	MLX4_GET(fw->fw_pages,     outbox, QUERY_FW_SIZE_OFFSET);
	MLX4_GET(fw->clr_int_base, outbox, QUERY_FW_CLR_INT_BASE_OFFSET);
	MLX4_GET(fw->clr_int_bar,  outbox, QUERY_FW_CLR_INT_BAR_OFFSET);
	fw->clr_int_bar = (fw->clr_int_bar >> 6) * 2;

	mlx4_dbg(dev, "FW size %d KB\n", fw->fw_pages >> 2);

	/*
	 * Round up number of system pages needed in case
	 * MLX4_ICM_PAGE_SIZE < PAGE_SIZE.
	 */
	fw->fw_pages =
		ALIGN(fw->fw_pages, PAGE_SIZE / MLX4_ICM_PAGE_SIZE) >>
		(PAGE_SHIFT - MLX4_ICM_PAGE_SHIFT);

	mlx4_dbg(dev, "Clear int @ %llx, BAR %d\n",
		 (unsigned long long) fw->clr_int_base, fw->clr_int_bar);

out:
	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

static void get_board_id(void *vsd, char *board_id)
{
	int i;

#define VSD_OFFSET_SIG1		0x00
#define VSD_OFFSET_SIG2		0xde
#define VSD_OFFSET_MLX_BOARD_ID	0xd0
#define VSD_OFFSET_TS_BOARD_ID	0x20

#define VSD_SIGNATURE_TOPSPIN	0x5ad

	memset(board_id, 0, MLX4_BOARD_ID_LEN);

	if (be16_to_cpup(vsd + VSD_OFFSET_SIG1) == VSD_SIGNATURE_TOPSPIN &&
	    be16_to_cpup(vsd + VSD_OFFSET_SIG2) == VSD_SIGNATURE_TOPSPIN) {
		strlcpy(board_id, vsd + VSD_OFFSET_TS_BOARD_ID, MLX4_BOARD_ID_LEN);
	} else {
		/*
		 * The board ID is a string but the firmware byte
		 * swaps each 4-byte word before passing it back to
		 * us.  Therefore we need to swab it before printing.
		 */
		for (i = 0; i < 4; ++i)
			((u32 *) board_id)[i] =
				swab32(*(u32 *) (vsd + VSD_OFFSET_MLX_BOARD_ID + i * 4));
	}
}

int mlx4_QUERY_ADAPTER(struct mlx4_dev *dev, struct mlx4_adapter *adapter)
{
	struct mlx4_cmd_mailbox *mailbox;
	u32 *outbox;
	int err;

#define QUERY_ADAPTER_OUT_SIZE             0x100
#define QUERY_ADAPTER_INTA_PIN_OFFSET      0x10
#define QUERY_ADAPTER_VSD_OFFSET           0x20

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	outbox = mailbox->buf;

	err = mlx4_cmd_box(dev, 0, mailbox->dma, 0, 0, MLX4_CMD_QUERY_ADAPTER,
			   MLX4_CMD_TIME_CLASS_A);
	if (err)
		goto out;

	MLX4_GET(adapter->inta_pin, outbox,    QUERY_ADAPTER_INTA_PIN_OFFSET);

	get_board_id(outbox + QUERY_ADAPTER_VSD_OFFSET / 4,
		     adapter->board_id);

out:
	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

int mlx4_INIT_HCA(struct mlx4_dev *dev, struct mlx4_init_hca_param *param)
{
	struct mlx4_cmd_mailbox *mailbox;
	__be32 *inbox;
	int err;

#define INIT_HCA_IN_SIZE		 0x200
#define INIT_HCA_VERSION_OFFSET		 0x000
#define	 INIT_HCA_VERSION		 2
#define INIT_HCA_FLAGS_OFFSET		 0x014
#define INIT_HCA_QPC_OFFSET		 0x020
#define	 INIT_HCA_QPC_BASE_OFFSET	 (INIT_HCA_QPC_OFFSET + 0x10)
#define	 INIT_HCA_LOG_QP_OFFSET		 (INIT_HCA_QPC_OFFSET + 0x17)
#define	 INIT_HCA_SRQC_BASE_OFFSET	 (INIT_HCA_QPC_OFFSET + 0x28)
#define	 INIT_HCA_LOG_SRQ_OFFSET	 (INIT_HCA_QPC_OFFSET + 0x2f)
#define	 INIT_HCA_CQC_BASE_OFFSET	 (INIT_HCA_QPC_OFFSET + 0x30)
#define	 INIT_HCA_LOG_CQ_OFFSET		 (INIT_HCA_QPC_OFFSET + 0x37)
#define	 INIT_HCA_ALTC_BASE_OFFSET	 (INIT_HCA_QPC_OFFSET + 0x40)
#define	 INIT_HCA_AUXC_BASE_OFFSET	 (INIT_HCA_QPC_OFFSET + 0x50)
#define	 INIT_HCA_EQC_BASE_OFFSET	 (INIT_HCA_QPC_OFFSET + 0x60)
#define	 INIT_HCA_LOG_EQ_OFFSET		 (INIT_HCA_QPC_OFFSET + 0x67)
#define	 INIT_HCA_RDMARC_BASE_OFFSET	 (INIT_HCA_QPC_OFFSET + 0x70)
#define	 INIT_HCA_LOG_RD_OFFSET		 (INIT_HCA_QPC_OFFSET + 0x77)
#define INIT_HCA_MCAST_OFFSET		 0x0c0
#define	 INIT_HCA_MC_BASE_OFFSET	 (INIT_HCA_MCAST_OFFSET + 0x00)
#define	 INIT_HCA_LOG_MC_ENTRY_SZ_OFFSET (INIT_HCA_MCAST_OFFSET + 0x12)
#define	 INIT_HCA_LOG_MC_HASH_SZ_OFFSET	 (INIT_HCA_MCAST_OFFSET + 0x16)
#define	 INIT_HCA_LOG_MC_TABLE_SZ_OFFSET (INIT_HCA_MCAST_OFFSET + 0x1b)
#define INIT_HCA_TPT_OFFSET		 0x0f0
#define	 INIT_HCA_DMPT_BASE_OFFSET	 (INIT_HCA_TPT_OFFSET + 0x00)
#define	 INIT_HCA_LOG_MPT_SZ_OFFSET	 (INIT_HCA_TPT_OFFSET + 0x0b)
#define	 INIT_HCA_MTT_BASE_OFFSET	 (INIT_HCA_TPT_OFFSET + 0x10)
#define	 INIT_HCA_CMPT_BASE_OFFSET	 (INIT_HCA_TPT_OFFSET + 0x18)
#define INIT_HCA_UAR_OFFSET		 0x120
#define	 INIT_HCA_LOG_UAR_SZ_OFFSET	 (INIT_HCA_UAR_OFFSET + 0x0a)
#define  INIT_HCA_UAR_PAGE_SZ_OFFSET     (INIT_HCA_UAR_OFFSET + 0x0b)

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	inbox = mailbox->buf;

	memset(inbox, 0, INIT_HCA_IN_SIZE);

	*((u8 *) mailbox->buf + INIT_HCA_VERSION_OFFSET) = INIT_HCA_VERSION;

#if defined(__LITTLE_ENDIAN)
	*(inbox + INIT_HCA_FLAGS_OFFSET / 4) &= ~cpu_to_be32(1 << 1);
#elif defined(__BIG_ENDIAN)
	*(inbox + INIT_HCA_FLAGS_OFFSET / 4) |= cpu_to_be32(1 << 1);
#else
#error Host endianness not defined
#endif
	/* Check port for UD address vector: */
	*(inbox + INIT_HCA_FLAGS_OFFSET / 4) |= cpu_to_be32(1);

	/* Enable IPoIB checksumming if we can: */
	if (dev->caps.flags & MLX4_DEV_CAP_FLAG_IPOIB_CSUM)
		*(inbox + INIT_HCA_FLAGS_OFFSET / 4) |= cpu_to_be32(1 << 3);

	/* Enable QoS support if module parameter set */
	if (enable_qos)
		*(inbox + INIT_HCA_FLAGS_OFFSET / 4) |= cpu_to_be32(1 << 2);

	/* QPC/EEC/CQC/EQC/RDMARC attributes */

	MLX4_PUT(inbox, param->qpc_base,      INIT_HCA_QPC_BASE_OFFSET);
	MLX4_PUT(inbox, param->log_num_qps,   INIT_HCA_LOG_QP_OFFSET);
	MLX4_PUT(inbox, param->srqc_base,     INIT_HCA_SRQC_BASE_OFFSET);
	MLX4_PUT(inbox, param->log_num_srqs,  INIT_HCA_LOG_SRQ_OFFSET);
	MLX4_PUT(inbox, param->cqc_base,      INIT_HCA_CQC_BASE_OFFSET);
	MLX4_PUT(inbox, param->log_num_cqs,   INIT_HCA_LOG_CQ_OFFSET);
	MLX4_PUT(inbox, param->altc_base,     INIT_HCA_ALTC_BASE_OFFSET);
	MLX4_PUT(inbox, param->auxc_base,     INIT_HCA_AUXC_BASE_OFFSET);
	MLX4_PUT(inbox, param->eqc_base,      INIT_HCA_EQC_BASE_OFFSET);
	MLX4_PUT(inbox, param->log_num_eqs,   INIT_HCA_LOG_EQ_OFFSET);
	MLX4_PUT(inbox, param->rdmarc_base,   INIT_HCA_RDMARC_BASE_OFFSET);
	MLX4_PUT(inbox, param->log_rd_per_qp, INIT_HCA_LOG_RD_OFFSET);

	/* multicast attributes */

	MLX4_PUT(inbox, param->mc_base,		INIT_HCA_MC_BASE_OFFSET);
	MLX4_PUT(inbox, param->log_mc_entry_sz, INIT_HCA_LOG_MC_ENTRY_SZ_OFFSET);
	MLX4_PUT(inbox, param->log_mc_hash_sz,  INIT_HCA_LOG_MC_HASH_SZ_OFFSET);
	MLX4_PUT(inbox, param->log_mc_table_sz, INIT_HCA_LOG_MC_TABLE_SZ_OFFSET);

	/* TPT attributes */

	MLX4_PUT(inbox, param->dmpt_base,  INIT_HCA_DMPT_BASE_OFFSET);
	MLX4_PUT(inbox, param->log_mpt_sz, INIT_HCA_LOG_MPT_SZ_OFFSET);
	MLX4_PUT(inbox, param->mtt_base,   INIT_HCA_MTT_BASE_OFFSET);
	MLX4_PUT(inbox, param->cmpt_base,  INIT_HCA_CMPT_BASE_OFFSET);

	/* UAR attributes */

	MLX4_PUT(inbox, (u8) (PAGE_SHIFT - 12), INIT_HCA_UAR_PAGE_SZ_OFFSET);
	MLX4_PUT(inbox, param->log_uar_sz,      INIT_HCA_LOG_UAR_SZ_OFFSET);

	err = mlx4_cmd(dev, mailbox->dma, 0, 0, MLX4_CMD_INIT_HCA, 10000);

	if (err)
		mlx4_err(dev, "INIT_HCA returns %d\n", err);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

int mlx4_INIT_PORT(struct mlx4_dev *dev, int port)
{
	struct mlx4_cmd_mailbox *mailbox;
	u32 *inbox;
	int err;
	u32 flags;
	u16 field;

	if (dev->flags & MLX4_FLAG_OLD_PORT_CMDS) {
#define INIT_PORT_IN_SIZE          256
#define INIT_PORT_FLAGS_OFFSET     0x00
#define INIT_PORT_FLAG_SIG         (1 << 18)
#define INIT_PORT_FLAG_NG          (1 << 17)
#define INIT_PORT_FLAG_G0          (1 << 16)
#define INIT_PORT_VL_SHIFT         4
#define INIT_PORT_PORT_WIDTH_SHIFT 8
#define INIT_PORT_MTU_OFFSET       0x04
#define INIT_PORT_MAX_GID_OFFSET   0x06
#define INIT_PORT_MAX_PKEY_OFFSET  0x0a
#define INIT_PORT_GUID0_OFFSET     0x10
#define INIT_PORT_NODE_GUID_OFFSET 0x18
#define INIT_PORT_SI_GUID_OFFSET   0x20

		mailbox = mlx4_alloc_cmd_mailbox(dev);
		if (IS_ERR(mailbox))
			return PTR_ERR(mailbox);
		inbox = mailbox->buf;

		memset(inbox, 0, INIT_PORT_IN_SIZE);

		flags = 0;
		flags |= (dev->caps.vl_cap[port] & 0xf) << INIT_PORT_VL_SHIFT;
		flags |= (dev->caps.port_width_cap[port] & 0xf) << INIT_PORT_PORT_WIDTH_SHIFT;
		MLX4_PUT(inbox, flags,		  INIT_PORT_FLAGS_OFFSET);

		field = 128 << dev->caps.mtu_cap[port];
		MLX4_PUT(inbox, field, INIT_PORT_MTU_OFFSET);
		field = dev->caps.gid_table_len[port];
		MLX4_PUT(inbox, field, INIT_PORT_MAX_GID_OFFSET);
		field = dev->caps.pkey_table_len[port];
		MLX4_PUT(inbox, field, INIT_PORT_MAX_PKEY_OFFSET);

		err = mlx4_cmd(dev, mailbox->dma, port, 0, MLX4_CMD_INIT_PORT,
			       MLX4_CMD_TIME_CLASS_A);

		mlx4_free_cmd_mailbox(dev, mailbox);
	} else
		err = mlx4_cmd(dev, 0, port, 0, MLX4_CMD_INIT_PORT,
			       MLX4_CMD_TIME_CLASS_A);

	return err;
}
EXPORT_SYMBOL_GPL(mlx4_INIT_PORT);

int mlx4_CLOSE_PORT(struct mlx4_dev *dev, int port)
{
	return mlx4_cmd(dev, 0, port, 0, MLX4_CMD_CLOSE_PORT, 1000);
}
EXPORT_SYMBOL_GPL(mlx4_CLOSE_PORT);

int mlx4_CLOSE_HCA(struct mlx4_dev *dev, int panic)
{
	return mlx4_cmd(dev, 0, 0, panic, MLX4_CMD_CLOSE_HCA, 1000);
}

int mlx4_SET_ICM_SIZE(struct mlx4_dev *dev, u64 icm_size, u64 *aux_pages)
{
	int ret = mlx4_cmd_imm(dev, icm_size, aux_pages, 0, 0,
			       MLX4_CMD_SET_ICM_SIZE,
			       MLX4_CMD_TIME_CLASS_A);
	if (ret)
		return ret;

	/*
	 * Round up number of system pages needed in case
	 * MLX4_ICM_PAGE_SIZE < PAGE_SIZE.
	 */
	*aux_pages = ALIGN(*aux_pages, PAGE_SIZE / MLX4_ICM_PAGE_SIZE) >>
		(PAGE_SHIFT - MLX4_ICM_PAGE_SHIFT);

	return 0;
}

int mlx4_NOP(struct mlx4_dev *dev)
{
	/* Input modifier of 0x1f means "finish as soon as possible." */
	return mlx4_cmd(dev, 0, 0x1f, 0, MLX4_CMD_NOP, 100);
}