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 
38 #define OCRDMA_VID_PCP_SHIFT	0xD
39 
40 static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
41 			struct ib_ah_attr *attr, union ib_gid *sgid, int pdid)
42 {
43 	int status = 0;
44 	u16 vlan_tag; bool vlan_enabled = false;
45 	struct ocrdma_eth_vlan eth;
46 	struct ocrdma_grh grh;
47 	int eth_sz;
48 
49 	memset(&eth, 0, sizeof(eth));
50 	memset(&grh, 0, sizeof(grh));
51 
52 	/* VLAN */
53 	vlan_tag = attr->vlan_id;
54 	if (!vlan_tag || (vlan_tag > 0xFFF))
55 		vlan_tag = dev->pvid;
56 	if (vlan_tag && (vlan_tag < 0x1000)) {
57 		eth.eth_type = cpu_to_be16(0x8100);
58 		eth.roce_eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
59 		vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT;
60 		eth.vlan_tag = cpu_to_be16(vlan_tag);
61 		eth_sz = sizeof(struct ocrdma_eth_vlan);
62 		vlan_enabled = true;
63 	} else {
64 		eth.eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
65 		eth_sz = sizeof(struct ocrdma_eth_basic);
66 	}
67 	/* MAC */
68 	memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
69 	status = ocrdma_resolve_dmac(dev, attr, &eth.dmac[0]);
70 	if (status)
71 		return status;
72 	ah->sgid_index = attr->grh.sgid_index;
73 	memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
74 	memcpy(&grh.dgid[0], attr->grh.dgid.raw, sizeof(attr->grh.dgid.raw));
75 
76 	grh.tclass_flow = cpu_to_be32((6 << 28) |
77 			(attr->grh.traffic_class << 24) |
78 			attr->grh.flow_label);
79 	/* 0x1b is next header value in GRH */
80 	grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
81 			(0x1b << 8) | attr->grh.hop_limit);
82 	/* Eth HDR */
83 	memcpy(&ah->av->eth_hdr, &eth, eth_sz);
84 	memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
85 	if (vlan_enabled)
86 		ah->av->valid |= OCRDMA_AV_VLAN_VALID;
87 	ah->av->valid = cpu_to_le32(ah->av->valid);
88 	return status;
89 }
90 
91 struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
92 {
93 	u32 *ahid_addr;
94 	int status;
95 	struct ocrdma_ah *ah;
96 	struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
97 	struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
98 	union ib_gid sgid;
99 
100 	if (!(attr->ah_flags & IB_AH_GRH))
101 		return ERR_PTR(-EINVAL);
102 
103 	if (atomic_cmpxchg(&dev->update_sl, 1, 0))
104 		ocrdma_init_service_level(dev);
105 	ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
106 	if (!ah)
107 		return ERR_PTR(-ENOMEM);
108 
109 	status = ocrdma_alloc_av(dev, ah);
110 	if (status)
111 		goto av_err;
112 
113 	status = ocrdma_query_gid(&dev->ibdev, 1, attr->grh.sgid_index, &sgid);
114 	if (status) {
115 		pr_err("%s(): Failed to query sgid, status = %d\n",
116 		      __func__, status);
117 		goto av_conf_err;
118 	}
119 
120 	if (pd->uctx) {
121 		status = rdma_addr_find_dmac_by_grh(&sgid, &attr->grh.dgid,
122                                         attr->dmac, &attr->vlan_id);
123 		if (status) {
124 			pr_err("%s(): Failed to resolve dmac from gid."
125 				"status = %d\n", __func__, status);
126 			goto av_conf_err;
127 		}
128 	}
129 
130 	status = set_av_attr(dev, ah, attr, &sgid, pd->id);
131 	if (status)
132 		goto av_conf_err;
133 
134 	/* if pd is for the user process, pass the ah_id to user space */
135 	if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
136 		ahid_addr = pd->uctx->ah_tbl.va + attr->dlid;
137 		*ahid_addr = ah->id;
138 	}
139 	return &ah->ibah;
140 
141 av_conf_err:
142 	ocrdma_free_av(dev, ah);
143 av_err:
144 	kfree(ah);
145 	return ERR_PTR(status);
146 }
147 
148 int ocrdma_destroy_ah(struct ib_ah *ibah)
149 {
150 	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
151 	struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
152 
153 	ocrdma_free_av(dev, ah);
154 	kfree(ah);
155 	return 0;
156 }
157 
158 int ocrdma_query_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
159 {
160 	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
161 	struct ocrdma_av *av = ah->av;
162 	struct ocrdma_grh *grh;
163 	attr->ah_flags |= IB_AH_GRH;
164 	if (ah->av->valid & OCRDMA_AV_VALID) {
165 		grh = (struct ocrdma_grh *)((u8 *)ah->av +
166 				sizeof(struct ocrdma_eth_vlan));
167 		attr->sl = be16_to_cpu(av->eth_hdr.vlan_tag) >> 13;
168 	} else {
169 		grh = (struct ocrdma_grh *)((u8 *)ah->av +
170 					sizeof(struct ocrdma_eth_basic));
171 		attr->sl = 0;
172 	}
173 	memcpy(&attr->grh.dgid.raw[0], &grh->dgid[0], sizeof(grh->dgid));
174 	attr->grh.sgid_index = ah->sgid_index;
175 	attr->grh.hop_limit = be32_to_cpu(grh->pdid_hoplimit) & 0xff;
176 	attr->grh.traffic_class = be32_to_cpu(grh->tclass_flow) >> 24;
177 	attr->grh.flow_label = be32_to_cpu(grh->tclass_flow) & 0x00ffffffff;
178 	return 0;
179 }
180 
181 int ocrdma_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
182 {
183 	/* modify_ah is unsupported */
184 	return -ENOSYS;
185 }
186 
187 int ocrdma_process_mad(struct ib_device *ibdev,
188 		       int process_mad_flags,
189 		       u8 port_num,
190 		       struct ib_wc *in_wc,
191 		       struct ib_grh *in_grh,
192 		       struct ib_mad *in_mad, struct ib_mad *out_mad)
193 {
194 	return IB_MAD_RESULT_SUCCESS;
195 }
196