drivers/infiniband/hw/mthca/mthca_av.c - kernel/bruno - Git at Google

 /*
  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005 Sun Microsystems, 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/string.h>
 #include <linux/slab.h>

 #include <rdma/ib_verbs.h>
 #include <rdma/ib_cache.h>

 #include "mthca_dev.h"

 enum {
       MTHCA_RATE_TAVOR_FULL   = 0,
       MTHCA_RATE_TAVOR_1X     = 1,
       MTHCA_RATE_TAVOR_4X     = 2,
       MTHCA_RATE_TAVOR_1X_DDR = 3
 };

 enum {
       MTHCA_RATE_MEMFREE_FULL    = 0,
       MTHCA_RATE_MEMFREE_QUARTER = 1,
       MTHCA_RATE_MEMFREE_EIGHTH  = 2,
       MTHCA_RATE_MEMFREE_HALF    = 3
 };

 struct mthca_av {
 	__be32 port_pd;
 	u8     reserved1;
 	u8     g_slid;
 	__be16 dlid;
 	u8     reserved2;
 	u8     gid_index;
 	u8     msg_sr;
 	u8     hop_limit;
 	__be32 sl_tclass_flowlabel;
 	__be32 dgid[4];
 };

 static enum ib_rate memfree_rate_to_ib(u8 mthca_rate, u8 port_rate)
 {
 	switch (mthca_rate) {
 	case MTHCA_RATE_MEMFREE_EIGHTH:
 		return mult_to_ib_rate(port_rate >> 3);
 	case MTHCA_RATE_MEMFREE_QUARTER:
 		return mult_to_ib_rate(port_rate >> 2);
 	case MTHCA_RATE_MEMFREE_HALF:
 		return mult_to_ib_rate(port_rate >> 1);
 	case MTHCA_RATE_MEMFREE_FULL:
 	default:
 		return mult_to_ib_rate(port_rate);
 	}
 }

 static enum ib_rate tavor_rate_to_ib(u8 mthca_rate, u8 port_rate)
 {
 	switch (mthca_rate) {
 	case MTHCA_RATE_TAVOR_1X:     return IB_RATE_2_5_GBPS;
 	case MTHCA_RATE_TAVOR_1X_DDR: return IB_RATE_5_GBPS;
 	case MTHCA_RATE_TAVOR_4X:     return IB_RATE_10_GBPS;
 	default:		      return mult_to_ib_rate(port_rate);
 	}
 }

 enum ib_rate mthca_rate_to_ib(struct mthca_dev *dev, u8 mthca_rate, u8 port)
 {
 	if (mthca_is_memfree(dev)) {
 		/* Handle old Arbel FW */
 		if (dev->limits.stat_rate_support == 0x3 && mthca_rate)
 			return IB_RATE_2_5_GBPS;

 		return memfree_rate_to_ib(mthca_rate, dev->rate[port - 1]);
 	} else
 		return tavor_rate_to_ib(mthca_rate, dev->rate[port - 1]);
 }

 static u8 ib_rate_to_memfree(u8 req_rate, u8 cur_rate)
 {
 	if (cur_rate <= req_rate)
 		return 0;

 	/*
 	 * Inter-packet delay (IPD) to get from rate X down to a rate
 	 * no more than Y is (X - 1) / Y.
 	 */
 	switch ((cur_rate - 1) / req_rate) {
 	case 0:	 return MTHCA_RATE_MEMFREE_FULL;
 	case 1:	 return MTHCA_RATE_MEMFREE_HALF;
 	case 2:	 /* fall through */
 	case 3:	 return MTHCA_RATE_MEMFREE_QUARTER;
 	default: return MTHCA_RATE_MEMFREE_EIGHTH;
 	}
 }

 static u8 ib_rate_to_tavor(u8 static_rate)
 {
 	switch (static_rate) {
 	case IB_RATE_2_5_GBPS: return MTHCA_RATE_TAVOR_1X;
 	case IB_RATE_5_GBPS:   return MTHCA_RATE_TAVOR_1X_DDR;
 	case IB_RATE_10_GBPS:  return MTHCA_RATE_TAVOR_4X;
 	default:	       return MTHCA_RATE_TAVOR_FULL;
 	}
 }

 u8 mthca_get_rate(struct mthca_dev *dev, int static_rate, u8 port)
 {
 	u8 rate;

 	if (!static_rate || ib_rate_to_mult(static_rate) >= dev->rate[port - 1])
 		return 0;

 	if (mthca_is_memfree(dev))
 		rate = ib_rate_to_memfree(ib_rate_to_mult(static_rate),
 					  dev->rate[port - 1]);
 	else
 		rate = ib_rate_to_tavor(static_rate);

 	if (!(dev->limits.stat_rate_support & (1 << rate)))
 		rate = 1;

 	return rate;
 }

 int mthca_create_ah(struct mthca_dev *dev,
 		    struct mthca_pd *pd,
 		    struct ib_ah_attr *ah_attr,
 		    struct mthca_ah *ah)
 {
 	u32 index = -1;
 	struct mthca_av *av = NULL;

 	ah->type = MTHCA_AH_PCI_POOL;

 	if (mthca_is_memfree(dev)) {
 		ah->av   = kmalloc(sizeof *ah->av, GFP_ATOMIC);
 		if (!ah->av)
 			return -ENOMEM;

 		ah->type = MTHCA_AH_KMALLOC;
 		av       = ah->av;
 	} else if (!atomic_read(&pd->sqp_count) &&
 		 !(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
 		index = mthca_alloc(&dev->av_table.alloc);

 		/* fall back to allocate in host memory */
 		if (index == -1)
 			goto on_hca_fail;

 		av = kmalloc(sizeof *av, GFP_ATOMIC);
 		if (!av)
 			goto on_hca_fail;

 		ah->type = MTHCA_AH_ON_HCA;
 		ah->avdma  = dev->av_table.ddr_av_base +
 			index * MTHCA_AV_SIZE;
 	}

 on_hca_fail:
 	if (ah->type == MTHCA_AH_PCI_POOL) {
 		ah->av = pci_pool_alloc(dev->av_table.pool,
 					GFP_ATOMIC, &ah->avdma);
 		if (!ah->av)
 			return -ENOMEM;

 		av = ah->av;
 	}

 	ah->key = pd->ntmr.ibmr.lkey;

 	memset(av, 0, MTHCA_AV_SIZE);

 	av->port_pd = cpu_to_be32(pd->pd_num | (ah_attr->port_num << 24));
 	av->g_slid  = ah_attr->src_path_bits;
 	av->dlid    = cpu_to_be16(ah_attr->dlid);
 	av->msg_sr  = (3 << 4) | /* 2K message */
 		mthca_get_rate(dev, ah_attr->static_rate, ah_attr->port_num);
 	av->sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
 	if (ah_attr->ah_flags & IB_AH_GRH) {
 		av->g_slid |= 0x80;
 		av->gid_index = (ah_attr->port_num - 1) * dev->limits.gid_table_len +
 			ah_attr->grh.sgid_index;
 		av->hop_limit = ah_attr->grh.hop_limit;
 		av->sl_tclass_flowlabel |=
 			cpu_to_be32((ah_attr->grh.traffic_class << 20) |
 				    ah_attr->grh.flow_label);
 		memcpy(av->dgid, ah_attr->grh.dgid.raw, 16);
 	} else {
 		/* Arbel workaround -- low byte of GID must be 2 */
 		av->dgid[3] = cpu_to_be32(2);
 	}

 	if (0) {
 		int j;

 		mthca_dbg(dev, "Created UDAV at %p/%08lx:\n",
 			  av, (unsigned long) ah->avdma);
 		for (j = 0; j < 8; ++j)
 			printk(KERN_DEBUG "  [%2x] %08x\n",
 			       j * 4, be32_to_cpu(((__be32 *) av)[j]));
 	}

 	if (ah->type == MTHCA_AH_ON_HCA) {
 		memcpy_toio(dev->av_table.av_map + index * MTHCA_AV_SIZE,
 			    av, MTHCA_AV_SIZE);
 		kfree(av);
 	}

 	return 0;
 }

 int mthca_destroy_ah(struct mthca_dev *dev, struct mthca_ah *ah)
 {
 	switch (ah->type) {
 	case MTHCA_AH_ON_HCA:
 		mthca_free(&dev->av_table.alloc,
 			   (ah->avdma - dev->av_table.ddr_av_base) /
 			   MTHCA_AV_SIZE);
 		break;

 	case MTHCA_AH_PCI_POOL:
 		pci_pool_free(dev->av_table.pool, ah->av, ah->avdma);
 		break;

 	case MTHCA_AH_KMALLOC:
 		kfree(ah->av);
 		break;
 	}

 	return 0;
 }

 int mthca_ah_grh_present(struct mthca_ah *ah)
 {
 	return !!(ah->av->g_slid & 0x80);
 }

 int mthca_read_ah(struct mthca_dev *dev, struct mthca_ah *ah,
 		  struct ib_ud_header *header)
 {
 	if (ah->type == MTHCA_AH_ON_HCA)
 		return -EINVAL;

 	header->lrh.service_level   = be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 28;
 	header->lrh.destination_lid = ah->av->dlid;
 	header->lrh.source_lid      = cpu_to_be16(ah->av->g_slid & 0x7f);
 	if (mthca_ah_grh_present(ah)) {
 		header->grh.traffic_class =
 			(be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 20) & 0xff;
 		header->grh.flow_label    =
 			ah->av->sl_tclass_flowlabel & cpu_to_be32(0xfffff);
 		header->grh.hop_limit     = ah->av->hop_limit;
 		ib_get_cached_gid(&dev->ib_dev,
 				  be32_to_cpu(ah->av->port_pd) >> 24,
 				  ah->av->gid_index % dev->limits.gid_table_len,
 				  &header->grh.source_gid, NULL);
 		memcpy(header->grh.destination_gid.raw,
 		       ah->av->dgid, 16);
 	}

 	return 0;
 }

 int mthca_ah_query(struct ib_ah *ibah, struct ib_ah_attr *attr)
 {
 	struct mthca_ah *ah   = to_mah(ibah);
 	struct mthca_dev *dev = to_mdev(ibah->device);

 	/* Only implement for MAD and memfree ah for now. */
 	if (ah->type == MTHCA_AH_ON_HCA)
 		return -ENOSYS;

 	memset(attr, 0, sizeof *attr);
 	attr->dlid          = be16_to_cpu(ah->av->dlid);
 	attr->sl            = be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 28;
 	attr->port_num      = be32_to_cpu(ah->av->port_pd) >> 24;
 	attr->static_rate   = mthca_rate_to_ib(dev, ah->av->msg_sr & 0x7,
 					       attr->port_num);
 	attr->src_path_bits = ah->av->g_slid & 0x7F;
 	attr->ah_flags      = mthca_ah_grh_present(ah) ? IB_AH_GRH : 0;

 	if (attr->ah_flags) {
 		attr->grh.traffic_class =
 			be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 20;
 		attr->grh.flow_label =
 			be32_to_cpu(ah->av->sl_tclass_flowlabel) & 0xfffff;
 		attr->grh.hop_limit  = ah->av->hop_limit;
 		attr->grh.sgid_index = ah->av->gid_index &
 				       (dev->limits.gid_table_len - 1);
 		memcpy(attr->grh.dgid.raw, ah->av->dgid, 16);
 	}

 	return 0;
 }

 int mthca_init_av_table(struct mthca_dev *dev)
 {
 	int err;

 	if (mthca_is_memfree(dev))
 		return 0;

 	err = mthca_alloc_init(&dev->av_table.alloc,
 			       dev->av_table.num_ddr_avs,
 			       dev->av_table.num_ddr_avs - 1,
 			       0);
 	if (err)
 		return err;

 	dev->av_table.pool = pci_pool_create("mthca_av", dev->pdev,
 					     MTHCA_AV_SIZE,
 					     MTHCA_AV_SIZE, 0);
 	if (!dev->av_table.pool)
 		goto out_free_alloc;

 	if (!(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
 		dev->av_table.av_map = ioremap(pci_resource_start(dev->pdev, 4) +
 					       dev->av_table.ddr_av_base -
 					       dev->ddr_start,
 					       dev->av_table.num_ddr_avs *
 					       MTHCA_AV_SIZE);
 		if (!dev->av_table.av_map)
 			goto out_free_pool;
 	} else
 		dev->av_table.av_map = NULL;

 	return 0;

  out_free_pool:
 	pci_pool_destroy(dev->av_table.pool);

  out_free_alloc:
 	mthca_alloc_cleanup(&dev->av_table.alloc);
 	return -ENOMEM;
 }

 void mthca_cleanup_av_table(struct mthca_dev *dev)
 {
 	if (mthca_is_memfree(dev))
 		return;

 	if (dev->av_table.av_map)
 		iounmap(dev->av_table.av_map);
 	pci_pool_destroy(dev->av_table.pool);
 	mthca_alloc_cleanup(&dev->av_table.alloc);
 }
	/*
	* Copyright (c) 2004 Topspin Communications. All rights reserved.
	* Copyright (c) 2005 Sun Microsystems, 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/string.h>
	#include <linux/slab.h>

	#include <rdma/ib_verbs.h>
	#include <rdma/ib_cache.h>

	#include "mthca_dev.h"

	enum {
	MTHCA_RATE_TAVOR_FULL = 0,
	MTHCA_RATE_TAVOR_1X = 1,
	MTHCA_RATE_TAVOR_4X = 2,
	MTHCA_RATE_TAVOR_1X_DDR = 3
	};

	enum {
	MTHCA_RATE_MEMFREE_FULL = 0,
	MTHCA_RATE_MEMFREE_QUARTER = 1,
	MTHCA_RATE_MEMFREE_EIGHTH = 2,
	MTHCA_RATE_MEMFREE_HALF = 3
	};

	struct mthca_av {
	__be32 port_pd;
	u8 reserved1;
	u8 g_slid;
	__be16 dlid;
	u8 reserved2;
	u8 gid_index;
	u8 msg_sr;
	u8 hop_limit;
	__be32 sl_tclass_flowlabel;
	__be32 dgid[4];
	};

	static enum ib_rate memfree_rate_to_ib(u8 mthca_rate, u8 port_rate)
	{
	switch (mthca_rate) {
	case MTHCA_RATE_MEMFREE_EIGHTH:
	return mult_to_ib_rate(port_rate >> 3);
	case MTHCA_RATE_MEMFREE_QUARTER:
	return mult_to_ib_rate(port_rate >> 2);
	case MTHCA_RATE_MEMFREE_HALF:
	return mult_to_ib_rate(port_rate >> 1);
	case MTHCA_RATE_MEMFREE_FULL:
	default:
	return mult_to_ib_rate(port_rate);
	}
	}

	static enum ib_rate tavor_rate_to_ib(u8 mthca_rate, u8 port_rate)
	{
	switch (mthca_rate) {
	case MTHCA_RATE_TAVOR_1X: return IB_RATE_2_5_GBPS;
	case MTHCA_RATE_TAVOR_1X_DDR: return IB_RATE_5_GBPS;
	case MTHCA_RATE_TAVOR_4X: return IB_RATE_10_GBPS;
	default: return mult_to_ib_rate(port_rate);
	}
	}

	enum ib_rate mthca_rate_to_ib(struct mthca_dev *dev, u8 mthca_rate, u8 port)
	{
	if (mthca_is_memfree(dev)) {
	/* Handle old Arbel FW */
	if (dev->limits.stat_rate_support == 0x3 && mthca_rate)
	return IB_RATE_2_5_GBPS;

	return memfree_rate_to_ib(mthca_rate, dev->rate[port - 1]);
	} else
	return tavor_rate_to_ib(mthca_rate, dev->rate[port - 1]);
	}

	static u8 ib_rate_to_memfree(u8 req_rate, u8 cur_rate)
	{
	if (cur_rate <= req_rate)
	return 0;

	/*
	* Inter-packet delay (IPD) to get from rate X down to a rate
	* no more than Y is (X - 1) / Y.
	*/
	switch ((cur_rate - 1) / req_rate) {
	case 0: return MTHCA_RATE_MEMFREE_FULL;
	case 1: return MTHCA_RATE_MEMFREE_HALF;
	case 2: /* fall through */
	case 3: return MTHCA_RATE_MEMFREE_QUARTER;
	default: return MTHCA_RATE_MEMFREE_EIGHTH;
	}
	}

	static u8 ib_rate_to_tavor(u8 static_rate)
	{
	switch (static_rate) {
	case IB_RATE_2_5_GBPS: return MTHCA_RATE_TAVOR_1X;
	case IB_RATE_5_GBPS: return MTHCA_RATE_TAVOR_1X_DDR;
	case IB_RATE_10_GBPS: return MTHCA_RATE_TAVOR_4X;
	default: return MTHCA_RATE_TAVOR_FULL;
	}
	}

	u8 mthca_get_rate(struct mthca_dev *dev, int static_rate, u8 port)
	{
	u8 rate;

	if (!static_rate \|\| ib_rate_to_mult(static_rate) >= dev->rate[port - 1])
	return 0;

	if (mthca_is_memfree(dev))
	rate = ib_rate_to_memfree(ib_rate_to_mult(static_rate),
	dev->rate[port - 1]);
	else
	rate = ib_rate_to_tavor(static_rate);

	if (!(dev->limits.stat_rate_support & (1 << rate)))
	rate = 1;

	return rate;
	}

	int mthca_create_ah(struct mthca_dev *dev,
	struct mthca_pd *pd,
	struct ib_ah_attr *ah_attr,
	struct mthca_ah *ah)
	{
	u32 index = -1;
	struct mthca_av *av = NULL;

	ah->type = MTHCA_AH_PCI_POOL;

	if (mthca_is_memfree(dev)) {
	ah->av = kmalloc(sizeof *ah->av, GFP_ATOMIC);
	if (!ah->av)
	return -ENOMEM;

	ah->type = MTHCA_AH_KMALLOC;
	av = ah->av;
	} else if (!atomic_read(&pd->sqp_count) &&
	!(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
	index = mthca_alloc(&dev->av_table.alloc);

	/* fall back to allocate in host memory */
	if (index == -1)
	goto on_hca_fail;

	av = kmalloc(sizeof *av, GFP_ATOMIC);
	if (!av)
	goto on_hca_fail;

	ah->type = MTHCA_AH_ON_HCA;
	ah->avdma = dev->av_table.ddr_av_base +
	index * MTHCA_AV_SIZE;
	}

	on_hca_fail:
	if (ah->type == MTHCA_AH_PCI_POOL) {
	ah->av = pci_pool_alloc(dev->av_table.pool,
	GFP_ATOMIC, &ah->avdma);
	if (!ah->av)
	return -ENOMEM;

	av = ah->av;
	}

	ah->key = pd->ntmr.ibmr.lkey;

	memset(av, 0, MTHCA_AV_SIZE);

	av->port_pd = cpu_to_be32(pd->pd_num \| (ah_attr->port_num << 24));
	av->g_slid = ah_attr->src_path_bits;
	av->dlid = cpu_to_be16(ah_attr->dlid);
	av->msg_sr = (3 << 4) \| /* 2K message */
	mthca_get_rate(dev, ah_attr->static_rate, ah_attr->port_num);
	av->sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
	if (ah_attr->ah_flags & IB_AH_GRH) {
	av->g_slid \|= 0x80;
	av->gid_index = (ah_attr->port_num - 1) * dev->limits.gid_table_len +
	ah_attr->grh.sgid_index;
	av->hop_limit = ah_attr->grh.hop_limit;
	av->sl_tclass_flowlabel \|=
	cpu_to_be32((ah_attr->grh.traffic_class << 20) \|
	ah_attr->grh.flow_label);
	memcpy(av->dgid, ah_attr->grh.dgid.raw, 16);
	} else {
	/* Arbel workaround -- low byte of GID must be 2 */
	av->dgid[3] = cpu_to_be32(2);
	}

	if (0) {
	int j;

	mthca_dbg(dev, "Created UDAV at %p/%08lx:\n",
	av, (unsigned long) ah->avdma);
	for (j = 0; j < 8; ++j)
	printk(KERN_DEBUG " [%2x] %08x\n",
	j * 4, be32_to_cpu(((__be32 *) av)[j]));
	}

	if (ah->type == MTHCA_AH_ON_HCA) {
	memcpy_toio(dev->av_table.av_map + index * MTHCA_AV_SIZE,
	av, MTHCA_AV_SIZE);
	kfree(av);
	}

	return 0;
	}

	int mthca_destroy_ah(struct mthca_dev dev, struct mthca_ah ah)
	{
	switch (ah->type) {
	case MTHCA_AH_ON_HCA:
	mthca_free(&dev->av_table.alloc,
	(ah->avdma - dev->av_table.ddr_av_base) /
	MTHCA_AV_SIZE);
	break;

	case MTHCA_AH_PCI_POOL:
	pci_pool_free(dev->av_table.pool, ah->av, ah->avdma);
	break;

	case MTHCA_AH_KMALLOC:
	kfree(ah->av);
	break;
	}

	return 0;
	}

	int mthca_ah_grh_present(struct mthca_ah *ah)
	{
	return !!(ah->av->g_slid & 0x80);
	}

	int mthca_read_ah(struct mthca_dev dev, struct mthca_ah ah,
	struct ib_ud_header *header)
	{
	if (ah->type == MTHCA_AH_ON_HCA)
	return -EINVAL;

	header->lrh.service_level = be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 28;
	header->lrh.destination_lid = ah->av->dlid;
	header->lrh.source_lid = cpu_to_be16(ah->av->g_slid & 0x7f);
	if (mthca_ah_grh_present(ah)) {
	header->grh.traffic_class =
	(be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 20) & 0xff;
	header->grh.flow_label =
	ah->av->sl_tclass_flowlabel & cpu_to_be32(0xfffff);
	header->grh.hop_limit = ah->av->hop_limit;
	ib_get_cached_gid(&dev->ib_dev,
	be32_to_cpu(ah->av->port_pd) >> 24,
	ah->av->gid_index % dev->limits.gid_table_len,
	&header->grh.source_gid, NULL);
	memcpy(header->grh.destination_gid.raw,
	ah->av->dgid, 16);
	}

	return 0;
	}

	int mthca_ah_query(struct ib_ah ibah, struct ib_ah_attr attr)
	{
	struct mthca_ah *ah = to_mah(ibah);
	struct mthca_dev *dev = to_mdev(ibah->device);

	/* Only implement for MAD and memfree ah for now. */
	if (ah->type == MTHCA_AH_ON_HCA)
	return -ENOSYS;

	memset(attr, 0, sizeof *attr);
	attr->dlid = be16_to_cpu(ah->av->dlid);
	attr->sl = be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 28;
	attr->port_num = be32_to_cpu(ah->av->port_pd) >> 24;
	attr->static_rate = mthca_rate_to_ib(dev, ah->av->msg_sr & 0x7,
	attr->port_num);
	attr->src_path_bits = ah->av->g_slid & 0x7F;
	attr->ah_flags = mthca_ah_grh_present(ah) ? IB_AH_GRH : 0;

	if (attr->ah_flags) {
	attr->grh.traffic_class =
	be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 20;
	attr->grh.flow_label =
	be32_to_cpu(ah->av->sl_tclass_flowlabel) & 0xfffff;
	attr->grh.hop_limit = ah->av->hop_limit;
	attr->grh.sgid_index = ah->av->gid_index &
	(dev->limits.gid_table_len - 1);
	memcpy(attr->grh.dgid.raw, ah->av->dgid, 16);
	}

	return 0;
	}

	int mthca_init_av_table(struct mthca_dev *dev)
	{
	int err;

	if (mthca_is_memfree(dev))
	return 0;

	err = mthca_alloc_init(&dev->av_table.alloc,
	dev->av_table.num_ddr_avs,
	dev->av_table.num_ddr_avs - 1,
	0);
	if (err)
	return err;

	dev->av_table.pool = pci_pool_create("mthca_av", dev->pdev,
	MTHCA_AV_SIZE,
	MTHCA_AV_SIZE, 0);
	if (!dev->av_table.pool)
	goto out_free_alloc;

	if (!(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
	dev->av_table.av_map = ioremap(pci_resource_start(dev->pdev, 4) +
	dev->av_table.ddr_av_base -
	dev->ddr_start,
	dev->av_table.num_ddr_avs *
	MTHCA_AV_SIZE);
	if (!dev->av_table.av_map)
	goto out_free_pool;
	} else
	dev->av_table.av_map = NULL;

	return 0;

	out_free_pool:
	pci_pool_destroy(dev->av_table.pool);

	out_free_alloc:
	mthca_alloc_cleanup(&dev->av_table.alloc);
	return -ENOMEM;
	}

	void mthca_cleanup_av_table(struct mthca_dev *dev)
	{
	if (mthca_is_memfree(dev))
	return;

	if (dev->av_table.av_map)
	iounmap(dev->av_table.av_map);
	pci_pool_destroy(dev->av_table.pool);
	mthca_alloc_cleanup(&dev->av_table.alloc);
	}