2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
33 #include <rdma/ib_mad.h>
34 #include <rdma/ib_smi.h>
36 #include <linux/mlx4/cmd.h>
37 #include <linux/gfp.h>
42 MLX4_IB_VENDOR_CLASS1 = 0x9,
43 MLX4_IB_VENDOR_CLASS2 = 0xa
46 int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey,
47 int port, struct ib_wc *in_wc, struct ib_grh *in_grh,
48 void *in_mad, void *response_mad)
50 struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
53 u32 in_modifier = port;
56 inmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
57 if (IS_ERR(inmailbox))
58 return PTR_ERR(inmailbox);
59 inbox = inmailbox->buf;
61 outmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
62 if (IS_ERR(outmailbox)) {
63 mlx4_free_cmd_mailbox(dev->dev, inmailbox);
64 return PTR_ERR(outmailbox);
67 memcpy(inbox, in_mad, 256);
70 * Key check traps can't be generated unless we have in_wc to
71 * tell us where to send the trap.
73 if (ignore_mkey || !in_wc)
75 if (ignore_bkey || !in_wc)
91 memset(inbox + 256, 0, 256);
92 ext_info = inbox + 256;
94 ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num);
95 ext_info->rqpn = cpu_to_be32(in_wc->src_qp);
96 ext_info->sl = in_wc->sl << 4;
97 ext_info->g_path = in_wc->dlid_path_bits |
98 (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
99 ext_info->pkey = cpu_to_be16(in_wc->pkey_index);
102 memcpy(ext_info->grh, in_grh, 40);
106 in_modifier |= in_wc->slid << 16;
109 err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma,
110 in_modifier, op_modifier,
111 MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C);
114 memcpy(response_mad, outmailbox->buf, 256);
116 mlx4_free_cmd_mailbox(dev->dev, inmailbox);
117 mlx4_free_cmd_mailbox(dev->dev, outmailbox);
122 static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
124 struct ib_ah *new_ah;
125 struct ib_ah_attr ah_attr;
127 if (!dev->send_agent[port_num - 1][0])
130 memset(&ah_attr, 0, sizeof ah_attr);
133 ah_attr.port_num = port_num;
135 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
140 spin_lock(&dev->sm_lock);
141 if (dev->sm_ah[port_num - 1])
142 ib_destroy_ah(dev->sm_ah[port_num - 1]);
143 dev->sm_ah[port_num - 1] = new_ah;
144 spin_unlock(&dev->sm_lock);
148 * Snoop SM MADs for port info and P_Key table sets, so we can
149 * synthesize LID change and P_Key change events.
151 static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad,
154 struct ib_event event;
156 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
157 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
158 mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
159 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
160 struct ib_port_info *pinfo =
161 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
162 u16 lid = be16_to_cpu(pinfo->lid);
164 update_sm_ah(to_mdev(ibdev), port_num,
165 be16_to_cpu(pinfo->sm_lid),
166 pinfo->neighbormtu_mastersmsl & 0xf);
168 event.device = ibdev;
169 event.element.port_num = port_num;
171 if (pinfo->clientrereg_resv_subnetto & 0x80) {
172 event.event = IB_EVENT_CLIENT_REREGISTER;
173 ib_dispatch_event(&event);
176 if (prev_lid != lid) {
177 event.event = IB_EVENT_LID_CHANGE;
178 ib_dispatch_event(&event);
182 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
183 event.device = ibdev;
184 event.event = IB_EVENT_PKEY_CHANGE;
185 event.element.port_num = port_num;
186 ib_dispatch_event(&event);
191 static void node_desc_override(struct ib_device *dev,
194 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
195 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
196 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
197 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
198 spin_lock(&to_mdev(dev)->sm_lock);
199 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
200 spin_unlock(&to_mdev(dev)->sm_lock);
204 static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
206 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
207 struct ib_mad_send_buf *send_buf;
208 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
212 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
213 IB_MGMT_MAD_DATA, GFP_ATOMIC);
215 * We rely here on the fact that MLX QPs don't use the
216 * address handle after the send is posted (this is
217 * wrong following the IB spec strictly, but we know
218 * it's OK for our devices).
220 spin_lock(&dev->sm_lock);
221 memcpy(send_buf->mad, mad, sizeof *mad);
222 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
223 ret = ib_post_send_mad(send_buf, NULL);
226 spin_unlock(&dev->sm_lock);
229 ib_free_send_mad(send_buf);
233 int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
234 struct ib_wc *in_wc, struct ib_grh *in_grh,
235 struct ib_mad *in_mad, struct ib_mad *out_mad)
237 u16 slid, prev_lid = 0;
239 struct ib_port_attr pattr;
241 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
243 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
244 forward_trap(to_mdev(ibdev), port_num, in_mad);
245 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
248 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
249 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
250 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
251 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
252 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
253 return IB_MAD_RESULT_SUCCESS;
256 * Don't process SMInfo queries or vendor-specific
257 * MADs -- the SMA can't handle them.
259 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
260 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
261 IB_SMP_ATTR_VENDOR_MASK))
262 return IB_MAD_RESULT_SUCCESS;
263 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
264 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1 ||
265 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2 ||
266 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
267 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
268 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
269 return IB_MAD_RESULT_SUCCESS;
271 return IB_MAD_RESULT_SUCCESS;
273 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
274 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
275 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
276 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
277 !ib_query_port(ibdev, port_num, &pattr))
278 prev_lid = pattr.lid;
280 err = mlx4_MAD_IFC(to_mdev(ibdev),
281 mad_flags & IB_MAD_IGNORE_MKEY,
282 mad_flags & IB_MAD_IGNORE_BKEY,
283 port_num, in_wc, in_grh, in_mad, out_mad);
285 return IB_MAD_RESULT_FAILURE;
287 if (!out_mad->mad_hdr.status) {
288 smp_snoop(ibdev, port_num, in_mad, prev_lid);
289 node_desc_override(ibdev, out_mad);
292 /* set return bit in status of directed route responses */
293 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
294 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
296 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
297 /* no response for trap repress */
298 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
300 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
303 static void send_handler(struct ib_mad_agent *agent,
304 struct ib_mad_send_wc *mad_send_wc)
306 ib_free_send_mad(mad_send_wc->send_buf);
309 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
311 struct ib_mad_agent *agent;
315 for (p = 0; p < dev->num_ports; ++p)
316 for (q = 0; q <= 1; ++q) {
317 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
318 q ? IB_QPT_GSI : IB_QPT_SMI,
319 NULL, 0, send_handler,
322 ret = PTR_ERR(agent);
325 dev->send_agent[p][q] = agent;
331 for (p = 0; p < dev->num_ports; ++p)
332 for (q = 0; q <= 1; ++q)
333 if (dev->send_agent[p][q])
334 ib_unregister_mad_agent(dev->send_agent[p][q]);
339 void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
341 struct ib_mad_agent *agent;
344 for (p = 0; p < dev->num_ports; ++p) {
345 for (q = 0; q <= 1; ++q) {
346 agent = dev->send_agent[p][q];
347 dev->send_agent[p][q] = NULL;
348 ib_unregister_mad_agent(agent);
352 ib_destroy_ah(dev->sm_ah[p]);