1 /* This file is part of the Emulex RoCE Device Driver for
2  * RoCE (RDMA over Converged Ethernet) adapters.
3  * Copyright (C) 2012-2015 Emulex. All rights reserved.
4  * EMULEX and SLI are trademarks of Emulex.
5  * www.emulex.com
6  *
7  * This software is available to you under a choice of one of two licenses.
8  * You may choose to be licensed under the terms of the GNU General Public
9  * License (GPL) Version 2, available from the file COPYING in the main
10  * directory of this source tree, or the BSD license below:
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  *
16  * - Redistributions of source code must retain the above copyright notice,
17  *   this list of conditions and the following disclaimer.
18  *
19  * - Redistributions in binary form must reproduce the above copyright
20  *   notice, this list of conditions and the following disclaimer in
21  *   the documentation and/or other materials provided with the distribution.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  *
35  * Contact Information:
36  * linux-drivers@emulex.com
37  *
38  * Emulex
39  * 3333 Susan Street
40  * Costa Mesa, CA 92626
41  */
42 
43 #include <net/neighbour.h>
44 #include <net/netevent.h>
45 
46 #include <rdma/ib_addr.h>
47 #include <rdma/ib_mad.h>
48 #include <rdma/ib_cache.h>
49 
50 #include "ocrdma.h"
51 #include "ocrdma_verbs.h"
52 #include "ocrdma_ah.h"
53 #include "ocrdma_hw.h"
54 #include "ocrdma_stats.h"
55 
56 #define OCRDMA_VID_PCP_SHIFT	0xD
57 
ocrdma_hdr_type_to_proto_num(int devid,u8 hdr_type)58 static u16 ocrdma_hdr_type_to_proto_num(int devid, u8 hdr_type)
59 {
60 	switch (hdr_type) {
61 	case OCRDMA_L3_TYPE_IB_GRH:
62 		return (u16)ETH_P_IBOE;
63 	case OCRDMA_L3_TYPE_IPV4:
64 		return (u16)0x0800;
65 	case OCRDMA_L3_TYPE_IPV6:
66 		return (u16)0x86dd;
67 	default:
68 		pr_err("ocrdma%d: Invalid network header\n", devid);
69 		return 0;
70 	}
71 }
72 
set_av_attr(struct ocrdma_dev * dev,struct ocrdma_ah * ah,struct rdma_ah_attr * attr,const union ib_gid * sgid,int pdid,bool * isvlan,u16 vlan_tag)73 static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
74 			struct rdma_ah_attr *attr, const union ib_gid *sgid,
75 			int pdid, bool *isvlan, u16 vlan_tag)
76 {
77 	int status;
78 	struct ocrdma_eth_vlan eth;
79 	struct ocrdma_grh grh;
80 	int eth_sz;
81 	u16 proto_num = 0;
82 	u8 nxthdr = 0x11;
83 	struct iphdr ipv4;
84 	const struct ib_global_route *ib_grh;
85 	union {
86 		struct sockaddr_in  _sockaddr_in;
87 		struct sockaddr_in6 _sockaddr_in6;
88 	} sgid_addr, dgid_addr;
89 
90 	memset(&eth, 0, sizeof(eth));
91 	memset(&grh, 0, sizeof(grh));
92 
93 	/* Protocol Number */
94 	proto_num = ocrdma_hdr_type_to_proto_num(dev->id, ah->hdr_type);
95 	if (!proto_num)
96 		return -EINVAL;
97 	nxthdr = (proto_num == ETH_P_IBOE) ? 0x1b : 0x11;
98 	/* VLAN */
99 	if (!vlan_tag || (vlan_tag > 0xFFF))
100 		vlan_tag = dev->pvid;
101 	if (vlan_tag || dev->pfc_state) {
102 		if (!vlan_tag) {
103 			pr_err("ocrdma%d:Using VLAN with PFC is recommended\n",
104 				dev->id);
105 			pr_err("ocrdma%d:Using VLAN 0 for this connection\n",
106 				dev->id);
107 		}
108 		eth.eth_type = cpu_to_be16(0x8100);
109 		eth.roce_eth_type = cpu_to_be16(proto_num);
110 		vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT;
111 		eth.vlan_tag = cpu_to_be16(vlan_tag);
112 		eth_sz = sizeof(struct ocrdma_eth_vlan);
113 		*isvlan = true;
114 	} else {
115 		eth.eth_type = cpu_to_be16(proto_num);
116 		eth_sz = sizeof(struct ocrdma_eth_basic);
117 	}
118 	/* MAC */
119 	memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
120 	status = ocrdma_resolve_dmac(dev, attr, &eth.dmac[0]);
121 	if (status)
122 		return status;
123 	ib_grh = rdma_ah_read_grh(attr);
124 	ah->sgid_index = ib_grh->sgid_index;
125 	/* Eth HDR */
126 	memcpy(&ah->av->eth_hdr, &eth, eth_sz);
127 	if (ah->hdr_type == RDMA_NETWORK_IPV4) {
128 		*((__be16 *)&ipv4) = htons((4 << 12) | (5 << 8) |
129 					   ib_grh->traffic_class);
130 		ipv4.id = cpu_to_be16(pdid);
131 		ipv4.frag_off = htons(IP_DF);
132 		ipv4.tot_len = htons(0);
133 		ipv4.ttl = ib_grh->hop_limit;
134 		ipv4.protocol = nxthdr;
135 		rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
136 		ipv4.saddr = sgid_addr._sockaddr_in.sin_addr.s_addr;
137 		rdma_gid2ip((struct sockaddr*)&dgid_addr, &ib_grh->dgid);
138 		ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
139 		memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
140 	} else {
141 		memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
142 		grh.tclass_flow = cpu_to_be32((6 << 28) |
143 					      (ib_grh->traffic_class << 24) |
144 					      ib_grh->flow_label);
145 		memcpy(&grh.dgid[0], ib_grh->dgid.raw,
146 		       sizeof(ib_grh->dgid.raw));
147 		grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
148 						(nxthdr << 8) |
149 						ib_grh->hop_limit);
150 		memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
151 	}
152 	if (*isvlan)
153 		ah->av->valid |= OCRDMA_AV_VLAN_VALID;
154 	ah->av->valid = cpu_to_le32(ah->av->valid);
155 	return status;
156 }
157 
ocrdma_create_ah(struct ib_ah * ibah,struct rdma_ah_attr * attr,u32 flags,struct ib_udata * udata)158 int ocrdma_create_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr, u32 flags,
159 		     struct ib_udata *udata)
160 {
161 	u32 *ahid_addr;
162 	int status;
163 	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
164 	bool isvlan = false;
165 	u16 vlan_tag = 0xffff;
166 	const struct ib_gid_attr *sgid_attr;
167 	struct ocrdma_pd *pd = get_ocrdma_pd(ibah->pd);
168 	struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
169 
170 	if ((attr->type != RDMA_AH_ATTR_TYPE_ROCE) ||
171 	    !(rdma_ah_get_ah_flags(attr) & IB_AH_GRH))
172 		return -EINVAL;
173 
174 	if (atomic_cmpxchg(&dev->update_sl, 1, 0))
175 		ocrdma_init_service_level(dev);
176 
177 	sgid_attr = attr->grh.sgid_attr;
178 	status = rdma_read_gid_l2_fields(sgid_attr, &vlan_tag, NULL);
179 	if (status)
180 		return status;
181 
182 	status = ocrdma_alloc_av(dev, ah);
183 	if (status)
184 		goto av_err;
185 
186 	/* Get network header type for this GID */
187 	ah->hdr_type = rdma_gid_attr_network_type(sgid_attr);
188 
189 	status = set_av_attr(dev, ah, attr, &sgid_attr->gid, pd->id,
190 			     &isvlan, vlan_tag);
191 	if (status)
192 		goto av_conf_err;
193 
194 	/* if pd is for the user process, pass the ah_id to user space */
195 	if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
196 		ahid_addr = pd->uctx->ah_tbl.va + rdma_ah_get_dlid(attr);
197 		*ahid_addr = 0;
198 		*ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
199 		if (ocrdma_is_udp_encap_supported(dev)) {
200 			*ahid_addr |= ((u32)ah->hdr_type &
201 				       OCRDMA_AH_L3_TYPE_MASK) <<
202 				       OCRDMA_AH_L3_TYPE_SHIFT;
203 		}
204 		if (isvlan)
205 			*ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
206 				       OCRDMA_AH_VLAN_VALID_SHIFT);
207 	}
208 
209 	return 0;
210 
211 av_conf_err:
212 	ocrdma_free_av(dev, ah);
213 av_err:
214 	return status;
215 }
216 
ocrdma_destroy_ah(struct ib_ah * ibah,u32 flags)217 void ocrdma_destroy_ah(struct ib_ah *ibah, u32 flags)
218 {
219 	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
220 	struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
221 
222 	ocrdma_free_av(dev, ah);
223 }
224 
ocrdma_query_ah(struct ib_ah * ibah,struct rdma_ah_attr * attr)225 int ocrdma_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
226 {
227 	struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
228 	struct ocrdma_av *av = ah->av;
229 	struct ocrdma_grh *grh;
230 
231 	attr->type = ibah->type;
232 	if (ah->av->valid & OCRDMA_AV_VALID) {
233 		grh = (struct ocrdma_grh *)((u8 *)ah->av +
234 				sizeof(struct ocrdma_eth_vlan));
235 		rdma_ah_set_sl(attr, be16_to_cpu(av->eth_hdr.vlan_tag) >> 13);
236 	} else {
237 		grh = (struct ocrdma_grh *)((u8 *)ah->av +
238 					sizeof(struct ocrdma_eth_basic));
239 		rdma_ah_set_sl(attr, 0);
240 	}
241 	rdma_ah_set_grh(attr, NULL,
242 			be32_to_cpu(grh->tclass_flow) & 0xffffffff,
243 			ah->sgid_index,
244 			be32_to_cpu(grh->pdid_hoplimit) & 0xff,
245 			be32_to_cpu(grh->tclass_flow) >> 24);
246 	rdma_ah_set_dgid_raw(attr, &grh->dgid[0]);
247 	return 0;
248 }
249 
ocrdma_process_mad(struct ib_device * ibdev,int process_mad_flags,u8 port_num,const struct ib_wc * in_wc,const struct ib_grh * in_grh,const struct ib_mad_hdr * in,size_t in_mad_size,struct ib_mad_hdr * out,size_t * out_mad_size,u16 * out_mad_pkey_index)250 int ocrdma_process_mad(struct ib_device *ibdev,
251 		       int process_mad_flags,
252 		       u8 port_num,
253 		       const struct ib_wc *in_wc,
254 		       const struct ib_grh *in_grh,
255 		       const struct ib_mad_hdr *in, size_t in_mad_size,
256 		       struct ib_mad_hdr *out, size_t *out_mad_size,
257 		       u16 *out_mad_pkey_index)
258 {
259 	int status;
260 	struct ocrdma_dev *dev;
261 	const struct ib_mad *in_mad = (const struct ib_mad *)in;
262 	struct ib_mad *out_mad = (struct ib_mad *)out;
263 
264 	if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
265 			 *out_mad_size != sizeof(*out_mad)))
266 		return IB_MAD_RESULT_FAILURE;
267 
268 	switch (in_mad->mad_hdr.mgmt_class) {
269 	case IB_MGMT_CLASS_PERF_MGMT:
270 		dev = get_ocrdma_dev(ibdev);
271 		if (!ocrdma_pma_counters(dev, out_mad))
272 			status = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
273 		else
274 			status = IB_MAD_RESULT_SUCCESS;
275 		break;
276 	default:
277 		status = IB_MAD_RESULT_SUCCESS;
278 		break;
279 	}
280 	return status;
281 }
282