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 static 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 > 0xFFF))
54 		vlan_tag = dev->pvid;
55 	if (vlan_tag && (vlan_tag < 0x1000)) {
56 		eth.eth_type = cpu_to_be16(0x8100);
57 		eth.roce_eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
58 		vlan_tag |= (attr->sl & 7) << 13;
59 		eth.vlan_tag = cpu_to_be16(vlan_tag);
60 		eth_sz = sizeof(struct ocrdma_eth_vlan);
61 		vlan_enabled = true;
62 	} else {
63 		eth.eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
64 		eth_sz = sizeof(struct ocrdma_eth_basic);
65 	}
66 	memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
67 	status = ocrdma_resolve_dgid(dev, &attr->grh.dgid, &eth.dmac[0]);
68 	if (status)
69 		return status;
70 	status = ocrdma_query_gid(&dev->ibdev, 1, attr->grh.sgid_index,
71 			(union ib_gid *)&grh.sgid[0]);
72 	if (status)
73 		return status;
74 
75 	grh.tclass_flow = cpu_to_be32((6 << 28) |
76 			(attr->grh.traffic_class << 24) |
77 			attr->grh.flow_label);
78 	/* 0x1b is next header value in GRH */
79 	grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
80 			(0x1b << 8) | attr->grh.hop_limit);
81 
82 	memcpy(&grh.dgid[0], attr->grh.dgid.raw, sizeof(attr->grh.dgid.raw));
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 	return status;
88 }
89 
90 struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
91 {
92 	u32 *ahid_addr;
93 	int status;
94 	struct ocrdma_ah *ah;
95 	struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
96 	struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
97 
98 	if (!(attr->ah_flags & IB_AH_GRH))
99 		return ERR_PTR(-EINVAL);
100 
101 	ah = kzalloc(sizeof *ah, GFP_ATOMIC);
102 	if (!ah)
103 		return ERR_PTR(-ENOMEM);
104 
105 	status = ocrdma_alloc_av(dev, ah);
106 	if (status)
107 		goto av_err;
108 	status = set_av_attr(dev, ah, attr, pd->id);
109 	if (status)
110 		goto av_conf_err;
111 
112 	/* if pd is for the user process, pass the ah_id to user space */
113 	if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
114 		ahid_addr = pd->uctx->ah_tbl.va + attr->dlid;
115 		*ahid_addr = ah->id;
116 	}
117 	return &ah->ibah;
118 
119 av_conf_err:
120 	ocrdma_free_av(dev, ah);
121 av_err:
122 	kfree(ah);
123 	return ERR_PTR(status);
124 }
125 
126 int ocrdma_destroy_ah(struct ib_ah *ibah)
127 {
128 	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
129 	struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
130 
131 	ocrdma_free_av(dev, ah);
132 	kfree(ah);
133 	return 0;
134 }
135 
136 int ocrdma_query_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
137 {
138 	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
139 	struct ocrdma_av *av = ah->av;
140 	struct ocrdma_grh *grh;
141 	attr->ah_flags |= IB_AH_GRH;
142 	if (ah->av->valid & Bit(1)) {
143 		grh = (struct ocrdma_grh *)((u8 *)ah->av +
144 				sizeof(struct ocrdma_eth_vlan));
145 		attr->sl = be16_to_cpu(av->eth_hdr.vlan_tag) >> 13;
146 	} else {
147 		grh = (struct ocrdma_grh *)((u8 *)ah->av +
148 					sizeof(struct ocrdma_eth_basic));
149 		attr->sl = 0;
150 	}
151 	memcpy(&attr->grh.dgid.raw[0], &grh->dgid[0], sizeof(grh->dgid));
152 	attr->grh.sgid_index = ah->sgid_index;
153 	attr->grh.hop_limit = be32_to_cpu(grh->pdid_hoplimit) & 0xff;
154 	attr->grh.traffic_class = be32_to_cpu(grh->tclass_flow) >> 24;
155 	attr->grh.flow_label = be32_to_cpu(grh->tclass_flow) & 0x00ffffffff;
156 	return 0;
157 }
158 
159 int ocrdma_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
160 {
161 	/* modify_ah is unsupported */
162 	return -ENOSYS;
163 }
164 
165 int ocrdma_process_mad(struct ib_device *ibdev,
166 		       int process_mad_flags,
167 		       u8 port_num,
168 		       struct ib_wc *in_wc,
169 		       struct ib_grh *in_grh,
170 		       struct ib_mad *in_mad, struct ib_mad *out_mad)
171 {
172 	return IB_MAD_RESULT_SUCCESS;
173 }
174