1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 * 34 * $Id: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $ 35 */ 36 37 #include <rdma/ib_verbs.h> 38 #include <rdma/ib_mad.h> 39 #include <rdma/ib_smi.h> 40 41 #include "mthca_dev.h" 42 #include "mthca_cmd.h" 43 44 enum { 45 MTHCA_VENDOR_CLASS1 = 0x9, 46 MTHCA_VENDOR_CLASS2 = 0xa 47 }; 48 49 struct mthca_trap_mad { 50 struct ib_mad *mad; 51 DECLARE_PCI_UNMAP_ADDR(mapping) 52 }; 53 54 static void update_sm_ah(struct mthca_dev *dev, 55 u8 port_num, u16 lid, u8 sl) 56 { 57 struct ib_ah *new_ah; 58 struct ib_ah_attr ah_attr; 59 unsigned long flags; 60 61 if (!dev->send_agent[port_num - 1][0]) 62 return; 63 64 memset(&ah_attr, 0, sizeof ah_attr); 65 ah_attr.dlid = lid; 66 ah_attr.sl = sl; 67 ah_attr.port_num = port_num; 68 69 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd, 70 &ah_attr); 71 if (IS_ERR(new_ah)) 72 return; 73 74 spin_lock_irqsave(&dev->sm_lock, flags); 75 if (dev->sm_ah[port_num - 1]) 76 ib_destroy_ah(dev->sm_ah[port_num - 1]); 77 dev->sm_ah[port_num - 1] = new_ah; 78 spin_unlock_irqrestore(&dev->sm_lock, flags); 79 } 80 81 /* 82 * Snoop SM MADs for port info and P_Key table sets, so we can 83 * synthesize LID change and P_Key change events. 84 */ 85 static void smp_snoop(struct ib_device *ibdev, 86 u8 port_num, 87 struct ib_mad *mad) 88 { 89 struct ib_event event; 90 91 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 92 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 93 mad->mad_hdr.method == IB_MGMT_METHOD_SET) { 94 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) { 95 update_sm_ah(to_mdev(ibdev), port_num, 96 be16_to_cpup((__be16 *) (mad->data + 58)), 97 (*(u8 *) (mad->data + 76)) & 0xf); 98 99 event.device = ibdev; 100 event.event = IB_EVENT_LID_CHANGE; 101 event.element.port_num = port_num; 102 ib_dispatch_event(&event); 103 } 104 105 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) { 106 event.device = ibdev; 107 event.event = IB_EVENT_PKEY_CHANGE; 108 event.element.port_num = port_num; 109 ib_dispatch_event(&event); 110 } 111 } 112 } 113 114 static void forward_trap(struct mthca_dev *dev, 115 u8 port_num, 116 struct ib_mad *mad) 117 { 118 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED; 119 struct mthca_trap_mad *tmad; 120 struct ib_sge gather_list; 121 struct ib_send_wr *bad_wr, wr = { 122 .opcode = IB_WR_SEND, 123 .sg_list = &gather_list, 124 .num_sge = 1, 125 .send_flags = IB_SEND_SIGNALED, 126 .wr = { 127 .ud = { 128 .remote_qpn = qpn, 129 .remote_qkey = qpn ? IB_QP1_QKEY : 0, 130 .timeout_ms = 0 131 } 132 } 133 }; 134 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn]; 135 int ret; 136 unsigned long flags; 137 138 if (agent) { 139 tmad = kmalloc(sizeof *tmad, GFP_KERNEL); 140 if (!tmad) 141 return; 142 143 tmad->mad = kmalloc(sizeof *tmad->mad, GFP_KERNEL); 144 if (!tmad->mad) { 145 kfree(tmad); 146 return; 147 } 148 149 memcpy(tmad->mad, mad, sizeof *mad); 150 151 wr.wr.ud.mad_hdr = &tmad->mad->mad_hdr; 152 wr.wr_id = (unsigned long) tmad; 153 154 gather_list.addr = dma_map_single(agent->device->dma_device, 155 tmad->mad, 156 sizeof *tmad->mad, 157 DMA_TO_DEVICE); 158 gather_list.length = sizeof *tmad->mad; 159 gather_list.lkey = to_mpd(agent->qp->pd)->ntmr.ibmr.lkey; 160 pci_unmap_addr_set(tmad, mapping, gather_list.addr); 161 162 /* 163 * We rely here on the fact that MLX QPs don't use the 164 * address handle after the send is posted (this is 165 * wrong following the IB spec strictly, but we know 166 * it's OK for our devices). 167 */ 168 spin_lock_irqsave(&dev->sm_lock, flags); 169 wr.wr.ud.ah = dev->sm_ah[port_num - 1]; 170 if (wr.wr.ud.ah) 171 ret = ib_post_send_mad(agent, &wr, &bad_wr); 172 else 173 ret = -EINVAL; 174 spin_unlock_irqrestore(&dev->sm_lock, flags); 175 176 if (ret) { 177 dma_unmap_single(agent->device->dma_device, 178 pci_unmap_addr(tmad, mapping), 179 sizeof *tmad->mad, 180 DMA_TO_DEVICE); 181 kfree(tmad->mad); 182 kfree(tmad); 183 } 184 } 185 } 186 187 int mthca_process_mad(struct ib_device *ibdev, 188 int mad_flags, 189 u8 port_num, 190 struct ib_wc *in_wc, 191 struct ib_grh *in_grh, 192 struct ib_mad *in_mad, 193 struct ib_mad *out_mad) 194 { 195 int err; 196 u8 status; 197 u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE); 198 199 /* Forward locally generated traps to the SM */ 200 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && 201 slid == 0) { 202 forward_trap(to_mdev(ibdev), port_num, in_mad); 203 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 204 } 205 206 /* 207 * Only handle SM gets, sets and trap represses for SM class 208 * 209 * Only handle PMA and Mellanox vendor-specific class gets and 210 * sets for other classes. 211 */ 212 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 213 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 214 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 215 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && 216 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) 217 return IB_MAD_RESULT_SUCCESS; 218 219 /* 220 * Don't process SMInfo queries or vendor-specific 221 * MADs -- the SMA can't handle them. 222 */ 223 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || 224 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == 225 IB_SMP_ATTR_VENDOR_MASK)) 226 return IB_MAD_RESULT_SUCCESS; 227 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || 228 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 || 229 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) { 230 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 231 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) 232 return IB_MAD_RESULT_SUCCESS; 233 } else 234 return IB_MAD_RESULT_SUCCESS; 235 236 err = mthca_MAD_IFC(to_mdev(ibdev), 237 mad_flags & IB_MAD_IGNORE_MKEY, 238 mad_flags & IB_MAD_IGNORE_BKEY, 239 port_num, in_wc, in_grh, in_mad, out_mad, 240 &status); 241 if (err) { 242 mthca_err(to_mdev(ibdev), "MAD_IFC failed\n"); 243 return IB_MAD_RESULT_FAILURE; 244 } 245 if (status == MTHCA_CMD_STAT_BAD_PKT) 246 return IB_MAD_RESULT_SUCCESS; 247 if (status) { 248 mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n", 249 status); 250 return IB_MAD_RESULT_FAILURE; 251 } 252 253 if (!out_mad->mad_hdr.status) 254 smp_snoop(ibdev, port_num, in_mad); 255 256 /* set return bit in status of directed route responses */ 257 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 258 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); 259 260 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) 261 /* no response for trap repress */ 262 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 263 264 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; 265 } 266 267 static void send_handler(struct ib_mad_agent *agent, 268 struct ib_mad_send_wc *mad_send_wc) 269 { 270 struct mthca_trap_mad *tmad = 271 (void *) (unsigned long) mad_send_wc->wr_id; 272 273 dma_unmap_single(agent->device->dma_device, 274 pci_unmap_addr(tmad, mapping), 275 sizeof *tmad->mad, 276 DMA_TO_DEVICE); 277 kfree(tmad->mad); 278 kfree(tmad); 279 } 280 281 int mthca_create_agents(struct mthca_dev *dev) 282 { 283 struct ib_mad_agent *agent; 284 int p, q; 285 286 spin_lock_init(&dev->sm_lock); 287 288 for (p = 0; p < dev->limits.num_ports; ++p) 289 for (q = 0; q <= 1; ++q) { 290 agent = ib_register_mad_agent(&dev->ib_dev, p + 1, 291 q ? IB_QPT_GSI : IB_QPT_SMI, 292 NULL, 0, send_handler, 293 NULL, NULL); 294 if (IS_ERR(agent)) 295 goto err; 296 dev->send_agent[p][q] = agent; 297 } 298 299 return 0; 300 301 err: 302 for (p = 0; p < dev->limits.num_ports; ++p) 303 for (q = 0; q <= 1; ++q) 304 if (dev->send_agent[p][q]) 305 ib_unregister_mad_agent(dev->send_agent[p][q]); 306 307 return PTR_ERR(agent); 308 } 309 310 void mthca_free_agents(struct mthca_dev *dev) 311 { 312 struct ib_mad_agent *agent; 313 int p, q; 314 315 for (p = 0; p < dev->limits.num_ports; ++p) { 316 for (q = 0; q <= 1; ++q) { 317 agent = dev->send_agent[p][q]; 318 dev->send_agent[p][q] = NULL; 319 ib_unregister_mad_agent(agent); 320 } 321 322 if (dev->sm_ah[p]) 323 ib_destroy_ah(dev->sm_ah[p]); 324 } 325 } 326