[net-next-2.6.git] / drivers / infiniband / hw / mlx4 / ah.c

/*
 * Copyright (c) 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 <rdma/ib_addr.h>
#include <rdma/ib_cache.h>

#include <linux/slab.h>
#include <linux/inet.h>
#include <linux/string.h>

#include "mlx4_ib.h"

int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr,
			u8 *mac, int *is_mcast, u8 port)
{
	struct in6_addr in6;

	*is_mcast = 0;

	memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6);
	if (rdma_link_local_addr(&in6))
		rdma_get_ll_mac(&in6, mac);
	else if (rdma_is_multicast_addr(&in6)) {
		rdma_get_mcast_mac(&in6, mac);
		*is_mcast = 1;
	} else
		return -EINVAL;

	return 0;
}

static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
				  struct mlx4_ib_ah *ah)
{
	struct mlx4_dev *dev = to_mdev(pd->device)->dev;

	ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
	ah->av.ib.g_slid  = ah_attr->src_path_bits;
	if (ah_attr->ah_flags & IB_AH_GRH) {
		ah->av.ib.g_slid   |= 0x80;
		ah->av.ib.gid_index = ah_attr->grh.sgid_index;
		ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
		ah->av.ib.sl_tclass_flowlabel |=
			cpu_to_be32((ah_attr->grh.traffic_class << 20) |
				    ah_attr->grh.flow_label);
		memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
	}

	ah->av.ib.dlid    = cpu_to_be16(ah_attr->dlid);
	if (ah_attr->static_rate) {
		ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
		while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
		       !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
			--ah->av.ib.stat_rate;
	}
	ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);

	return &ah->ibah;
}

static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
				    struct mlx4_ib_ah *ah)
{
	struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
	struct mlx4_dev *dev = ibdev->dev;
	union ib_gid sgid;
	u8 mac[6];
	int err;
	int is_mcast;
	u16 vlan_tag;

	err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num);
	if (err)
		return ERR_PTR(err);

	memcpy(ah->av.eth.mac, mac, 6);
	err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid);
	if (err)
		return ERR_PTR(err);
	vlan_tag = rdma_get_vlan_id(&sgid);
	if (vlan_tag < 0x1000)
		vlan_tag |= (ah_attr->sl & 7) << 13;
	ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
	ah->av.eth.gid_index = ah_attr->grh.sgid_index;
	ah->av.eth.vlan = cpu_to_be16(vlan_tag);
	if (ah_attr->static_rate) {
		ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
		while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
		       !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
			--ah->av.eth.stat_rate;
	}

	/*
	 * HW requires multicast LID so we just choose one.
	 */
	if (is_mcast)
		ah->av.ib.dlid = cpu_to_be16(0xc000);

	memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
	ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);

	return &ah->ibah;
}

struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
{
	struct mlx4_ib_ah *ah;
	struct ib_ah *ret;

	ah = kzalloc(sizeof *ah, GFP_ATOMIC);
	if (!ah)
		return ERR_PTR(-ENOMEM);

	if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) {
		if (!(ah_attr->ah_flags & IB_AH_GRH)) {
			ret = ERR_PTR(-EINVAL);
		} else {
			/*
			 * TBD: need to handle the case when we get
			 * called in an atomic context and there we
			 * might sleep.  We don't expect this
			 * currently since we're working with link
			 * local addresses which we can translate
			 * without going to sleep.
			 */
			ret = create_iboe_ah(pd, ah_attr, ah);
		}

		if (IS_ERR(ret))
			kfree(ah);

		return ret;
	} else
		return create_ib_ah(pd, ah_attr, ah); /* never fails */
}

int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
{
	struct mlx4_ib_ah *ah = to_mah(ibah);
	enum rdma_link_layer ll;

	memset(ah_attr, 0, sizeof *ah_attr);
	ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
	ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
	ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
	ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
	if (ah->av.ib.stat_rate)
		ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
	ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;

	if (mlx4_ib_ah_grh_present(ah)) {
		ah_attr->ah_flags = IB_AH_GRH;

		ah_attr->grh.traffic_class =
			be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
		ah_attr->grh.flow_label =
			be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
		ah_attr->grh.hop_limit  = ah->av.ib.hop_limit;
		ah_attr->grh.sgid_index = ah->av.ib.gid_index;
		memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
	}

	return 0;
}

int mlx4_ib_destroy_ah(struct ib_ah *ah)
{
	kfree(to_mah(ah));
	return 0;
}
Commit	Line	Data
225c7b1f RD	1	/*
	2	* Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*/
	32
fa417f7b	33	#include <rdma/ib_addr.h>
4c3eb3ca	34	#include <rdma/ib_cache.h>
fa417f7b	35
5a0e3ad6	36	#include <linux/slab.h>
fa417f7b EC	37	#include <linux/inet.h>
fa417f7b EC	38	#include <linux/string.h>
5a0e3ad6	39
225c7b1f RD	40	#include "mlx4_ib.h"
225c7b1f RD	41
fa417f7b EC	42	int mlx4_ib_resolve_grh(struct mlx4_ib_dev dev, const struct ib_ah_attr ah_attr,
fa417f7b EC	43	u8 mac, int is_mcast, u8 port)
225c7b1f	44	{
fa417f7b	45	struct in6_addr in6;
225c7b1f	46
fa417f7b	47	*is_mcast = 0;
225c7b1f	48
fa417f7b EC	49	memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6);
	50	if (rdma_link_local_addr(&in6))
	51	rdma_get_ll_mac(&in6, mac);
	52	else if (rdma_is_multicast_addr(&in6)) {
	53	rdma_get_mcast_mac(&in6, mac);
	54	*is_mcast = 1;
	55	} else
	56	return -EINVAL;
225c7b1f	57
fa417f7b EC	58	return 0;
	59	}
	60
	61	static struct ib_ah create_ib_ah(struct ib_pd pd, struct ib_ah_attr *ah_attr,
	62	struct mlx4_ib_ah *ah)
	63	{
	64	struct mlx4_dev *dev = to_mdev(pd->device)->dev;
	65
	66	ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn \| (ah_attr->port_num << 24));
	67	ah->av.ib.g_slid = ah_attr->src_path_bits;
225c7b1f	68	if (ah_attr->ah_flags & IB_AH_GRH) {
fa417f7b EC	69	ah->av.ib.g_slid \|= 0x80;
	70	ah->av.ib.gid_index = ah_attr->grh.sgid_index;
	71	ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
	72	ah->av.ib.sl_tclass_flowlabel \|=
225c7b1f RD	73	cpu_to_be32((ah_attr->grh.traffic_class << 20) \|
225c7b1f RD	74	ah_attr->grh.flow_label);
fa417f7b EC	75	memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
	76	}
	77
	78	ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid);
	79	if (ah_attr->static_rate) {
	80	ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
	81	while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
	82	!(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
	83	--ah->av.ib.stat_rate;
225c7b1f	84	}
fa417f7b	85	ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
225c7b1f RD	86
	87	return &ah->ibah;
	88	}
	89
fa417f7b EC	90	static struct ib_ah create_iboe_ah(struct ib_pd pd, struct ib_ah_attr *ah_attr,
	91	struct mlx4_ib_ah *ah)
	92	{
	93	struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
	94	struct mlx4_dev *dev = ibdev->dev;
4c3eb3ca	95	union ib_gid sgid;
fa417f7b EC	96	u8 mac[6];
	97	int err;
	98	int is_mcast;
4c3eb3ca	99	u16 vlan_tag;
fa417f7b EC	100
	101	err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num);
	102	if (err)
	103	return ERR_PTR(err);
	104
	105	memcpy(ah->av.eth.mac, mac, 6);
4c3eb3ca EC	106	err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid);
	107	if (err)
	108	return ERR_PTR(err);
	109	vlan_tag = rdma_get_vlan_id(&sgid);
	110	if (vlan_tag < 0x1000)
	111	vlan_tag \|= (ah_attr->sl & 7) << 13;
fa417f7b EC	112	ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn \| (ah_attr->port_num << 24));
fa417f7b EC	113	ah->av.eth.gid_index = ah_attr->grh.sgid_index;
4c3eb3ca	114	ah->av.eth.vlan = cpu_to_be16(vlan_tag);
fa417f7b EC	115	if (ah_attr->static_rate) {
	116	ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
	117	while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
	118	!(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
	119	--ah->av.eth.stat_rate;
	120	}
	121
	122	/*
	123	* HW requires multicast LID so we just choose one.
	124	*/
	125	if (is_mcast)
	126	ah->av.ib.dlid = cpu_to_be16(0xc000);
	127
	128	memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
	129	ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
	130
	131	return &ah->ibah;
	132	}
	133
	134	struct ib_ah mlx4_ib_create_ah(struct ib_pd pd, struct ib_ah_attr *ah_attr)
	135	{
	136	struct mlx4_ib_ah *ah;
	137	struct ib_ah *ret;
	138
	139	ah = kzalloc(sizeof *ah, GFP_ATOMIC);
	140	if (!ah)
	141	return ERR_PTR(-ENOMEM);
	142
	143	if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) {
	144	if (!(ah_attr->ah_flags & IB_AH_GRH)) {
	145	ret = ERR_PTR(-EINVAL);
	146	} else {
	147	/*
	148	* TBD: need to handle the case when we get
	149	* called in an atomic context and there we
	150	* might sleep. We don't expect this
	151	* currently since we're working with link
	152	* local addresses which we can translate
	153	* without going to sleep.
	154	*/
	155	ret = create_iboe_ah(pd, ah_attr, ah);
	156	}
	157
	158	if (IS_ERR(ret))
	159	kfree(ah);
	160
	161	return ret;
	162	} else
	163	return create_ib_ah(pd, ah_attr, ah); /* never fails */
	164	}
	165
225c7b1f RD	166	int mlx4_ib_query_ah(struct ib_ah ibah, struct ib_ah_attr ah_attr)
	167	{
	168	struct mlx4_ib_ah *ah = to_mah(ibah);
fa417f7b	169	enum rdma_link_layer ll;
225c7b1f RD	170
225c7b1f RD	171	memset(ah_attr, 0, sizeof *ah_attr);
fa417f7b EC	172	ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
	173	ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
	174	ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
	175	ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
	176	if (ah->av.ib.stat_rate)
	177	ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
	178	ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;
225c7b1f RD	179
	180	if (mlx4_ib_ah_grh_present(ah)) {
	181	ah_attr->ah_flags = IB_AH_GRH;
	182
	183	ah_attr->grh.traffic_class =
fa417f7b	184	be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
225c7b1f	185	ah_attr->grh.flow_label =
fa417f7b EC	186	be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
	187	ah_attr->grh.hop_limit = ah->av.ib.hop_limit;
	188	ah_attr->grh.sgid_index = ah->av.ib.gid_index;
	189	memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
225c7b1f RD	190	}
	191
	192	return 0;
	193	}
	194
	195	int mlx4_ib_destroy_ah(struct ib_ah *ah)
	196	{
	197	kfree(to_mah(ah));
	198	return 0;
	199	}