ocrdma_ah.c revision 1afc0454b6658ad2d0a87e594e1f06dc19c6977d 
1/*******************************************************************
2 * This file is part of the Emulex RoCE Device Driver for          *
3 * RoCE (RDMA over Converged Ethernet) adapters.                   *
4 * Copyright (C) 2008-2012 Emulex. All rights reserved.            *
5 * EMULEX and SLI are trademarks of Emulex.                        *
6 * www.emulex.com                                                  *
7 *                                                                 *
8 * This program is free software; you can redistribute it and/or   *
9 * modify it under the terms of version 2 of the GNU General       *
10 * Public License as published by the Free Software Foundation.    *
11 * This program is distributed in the hope that it will be useful. *
12 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
13 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
14 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
15 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
16 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
17 * more details, a copy of which can be found in the file COPYING  *
18 * included with this package.                                     *
19 *
20 * Contact Information:
21 * linux-drivers@emulex.com
22 *
23 * Emulex
24 * 3333 Susan Street
25 * Costa Mesa, CA 92626
26 *******************************************************************/
27
28#include <net/neighbour.h>
29#include <net/netevent.h>
30
31#include <rdma/ib_addr.h>
32
33#include "ocrdma.h"
34#include "ocrdma_verbs.h"
35#include "ocrdma_ah.h"
36#include "ocrdma_hw.h"
37
38static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
39				struct ib_ah_attr *attr, int pdid)
40{
41	int status = 0;
42	u16 vlan_tag; bool vlan_enabled = false;
43	struct ocrdma_eth_vlan eth;
44	struct ocrdma_grh grh;
45	int eth_sz;
46
47	memset(&eth, 0, sizeof(eth));
48	memset(&grh, 0, sizeof(grh));
49
50	ah->sgid_index = attr->grh.sgid_index;
51
52	vlan_tag = rdma_get_vlan_id(&attr->grh.dgid);
53	if (vlan_tag && (vlan_tag < 0x1000)) {
54		eth.eth_type = cpu_to_be16(0x8100);
55		eth.roce_eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
56		vlan_tag |= (attr->sl & 7) << 13;
57		eth.vlan_tag = cpu_to_be16(vlan_tag);
58		eth_sz = sizeof(struct ocrdma_eth_vlan);
59		vlan_enabled = true;
60	} else {
61		eth.eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
62		eth_sz = sizeof(struct ocrdma_eth_basic);
63	}
64	memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
65	status = ocrdma_resolve_dgid(dev, &attr->grh.dgid, &eth.dmac[0]);
66	if (status)
67		return status;
68	status = ocrdma_query_gid(&dev->ibdev, 1, attr->grh.sgid_index,
69			(union ib_gid *)&grh.sgid[0]);
70	if (status)
71		return status;
72
73	grh.tclass_flow = cpu_to_be32((6 << 28) |
74			(attr->grh.traffic_class << 24) |
75			attr->grh.flow_label);
76	/* 0x1b is next header value in GRH */
77	grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
78			(0x1b << 8) | attr->grh.hop_limit);
79
80	memcpy(&grh.dgid[0], attr->grh.dgid.raw, sizeof(attr->grh.dgid.raw));
81	memcpy(&ah->av->eth_hdr, &eth, eth_sz);
82	memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
83	if (vlan_enabled)
84		ah->av->valid |= OCRDMA_AV_VLAN_VALID;
85	return status;
86}
87
88struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
89{
90	u32 *ahid_addr;
91	int status;
92	struct ocrdma_ah *ah;
93	struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
94	struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
95
96	if (!(attr->ah_flags & IB_AH_GRH))
97		return ERR_PTR(-EINVAL);
98
99	ah = kzalloc(sizeof *ah, GFP_ATOMIC);
100	if (!ah)
101		return ERR_PTR(-ENOMEM);
102
103	status = ocrdma_alloc_av(dev, ah);
104	if (status)
105		goto av_err;
106	status = set_av_attr(dev, ah, attr, pd->id);
107	if (status)
108		goto av_conf_err;
109
110	/* if pd is for the user process, pass the ah_id to user space */
111	if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
112		ahid_addr = pd->uctx->ah_tbl.va + attr->dlid;
113		*ahid_addr = ah->id;
114	}
115	return &ah->ibah;
116
117av_conf_err:
118	ocrdma_free_av(dev, ah);
119av_err:
120	kfree(ah);
121	return ERR_PTR(status);
122}
123
124int ocrdma_destroy_ah(struct ib_ah *ibah)
125{
126	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
127	struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
128
129	ocrdma_free_av(dev, ah);
130	kfree(ah);
131	return 0;
132}
133
134int ocrdma_query_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
135{
136	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
137	struct ocrdma_av *av = ah->av;
138	struct ocrdma_grh *grh;
139	attr->ah_flags |= IB_AH_GRH;
140	if (ah->av->valid & Bit(1)) {
141		grh = (struct ocrdma_grh *)((u8 *)ah->av +
142				sizeof(struct ocrdma_eth_vlan));
143		attr->sl = be16_to_cpu(av->eth_hdr.vlan_tag) >> 13;
144	} else {
145		grh = (struct ocrdma_grh *)((u8 *)ah->av +
146					sizeof(struct ocrdma_eth_basic));
147		attr->sl = 0;
148	}
149	memcpy(&attr->grh.dgid.raw[0], &grh->dgid[0], sizeof(grh->dgid));
150	attr->grh.sgid_index = ah->sgid_index;
151	attr->grh.hop_limit = be32_to_cpu(grh->pdid_hoplimit) & 0xff;
152	attr->grh.traffic_class = be32_to_cpu(grh->tclass_flow) >> 24;
153	attr->grh.flow_label = be32_to_cpu(grh->tclass_flow) & 0x00ffffffff;
154	return 0;
155}
156
157int ocrdma_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
158{
159	/* modify_ah is unsupported */
160	return -ENOSYS;
161}
162
163int ocrdma_process_mad(struct ib_device *ibdev,
164		       int process_mad_flags,
165		       u8 port_num,
166		       struct ib_wc *in_wc,
167		       struct ib_grh *in_grh,
168		       struct ib_mad *in_mad, struct ib_mad *out_mad)
169{
170	return IB_MAD_RESULT_SUCCESS;
171}
172