Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2004 Topspin Communications. All rights reserved. |
| 3 | * |
| 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: |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or |
| 11 | * without modification, are permitted provided that the following |
| 12 | * conditions are met: |
| 13 | * |
| 14 | * - Redistributions of source code must retain the above |
| 15 | * copyright notice, this list of conditions and the following |
| 16 | * disclaimer. |
| 17 | * |
| 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. |
| 22 | * |
| 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 |
| 30 | * SOFTWARE. |
| 31 | * |
| 32 | * $Id: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $ |
| 33 | */ |
| 34 | |
| 35 | #include <ib_verbs.h> |
| 36 | #include <ib_mad.h> |
| 37 | #include <ib_smi.h> |
| 38 | |
| 39 | #include "mthca_dev.h" |
| 40 | #include "mthca_cmd.h" |
| 41 | |
| 42 | enum { |
| 43 | MTHCA_VENDOR_CLASS1 = 0x9, |
| 44 | MTHCA_VENDOR_CLASS2 = 0xa |
| 45 | }; |
| 46 | |
| 47 | struct mthca_trap_mad { |
| 48 | struct ib_mad *mad; |
| 49 | DECLARE_PCI_UNMAP_ADDR(mapping) |
| 50 | }; |
| 51 | |
| 52 | static void update_sm_ah(struct mthca_dev *dev, |
| 53 | u8 port_num, u16 lid, u8 sl) |
| 54 | { |
| 55 | struct ib_ah *new_ah; |
| 56 | struct ib_ah_attr ah_attr; |
| 57 | unsigned long flags; |
| 58 | |
| 59 | if (!dev->send_agent[port_num - 1][0]) |
| 60 | return; |
| 61 | |
| 62 | memset(&ah_attr, 0, sizeof ah_attr); |
| 63 | ah_attr.dlid = lid; |
| 64 | ah_attr.sl = sl; |
| 65 | ah_attr.port_num = port_num; |
| 66 | |
| 67 | new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd, |
| 68 | &ah_attr); |
| 69 | if (IS_ERR(new_ah)) |
| 70 | return; |
| 71 | |
| 72 | spin_lock_irqsave(&dev->sm_lock, flags); |
| 73 | if (dev->sm_ah[port_num - 1]) |
| 74 | ib_destroy_ah(dev->sm_ah[port_num - 1]); |
| 75 | dev->sm_ah[port_num - 1] = new_ah; |
| 76 | spin_unlock_irqrestore(&dev->sm_lock, flags); |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * Snoop SM MADs for port info and P_Key table sets, so we can |
| 81 | * synthesize LID change and P_Key change events. |
| 82 | */ |
| 83 | static void smp_snoop(struct ib_device *ibdev, |
| 84 | u8 port_num, |
| 85 | struct ib_mad *mad) |
| 86 | { |
| 87 | struct ib_event event; |
| 88 | |
| 89 | if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || |
| 90 | mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && |
| 91 | mad->mad_hdr.method == IB_MGMT_METHOD_SET) { |
| 92 | if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) { |
| 93 | update_sm_ah(to_mdev(ibdev), port_num, |
| 94 | be16_to_cpup((__be16 *) (mad->data + 58)), |
| 95 | (*(u8 *) (mad->data + 76)) & 0xf); |
| 96 | |
| 97 | event.device = ibdev; |
| 98 | event.event = IB_EVENT_LID_CHANGE; |
| 99 | event.element.port_num = port_num; |
| 100 | ib_dispatch_event(&event); |
| 101 | } |
| 102 | |
| 103 | if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) { |
| 104 | event.device = ibdev; |
| 105 | event.event = IB_EVENT_PKEY_CHANGE; |
| 106 | event.element.port_num = port_num; |
| 107 | ib_dispatch_event(&event); |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | static void forward_trap(struct mthca_dev *dev, |
| 113 | u8 port_num, |
| 114 | struct ib_mad *mad) |
| 115 | { |
| 116 | int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED; |
| 117 | struct mthca_trap_mad *tmad; |
| 118 | struct ib_sge gather_list; |
| 119 | struct ib_send_wr *bad_wr, wr = { |
| 120 | .opcode = IB_WR_SEND, |
| 121 | .sg_list = &gather_list, |
| 122 | .num_sge = 1, |
| 123 | .send_flags = IB_SEND_SIGNALED, |
| 124 | .wr = { |
| 125 | .ud = { |
| 126 | .remote_qpn = qpn, |
| 127 | .remote_qkey = qpn ? IB_QP1_QKEY : 0, |
| 128 | .timeout_ms = 0 |
| 129 | } |
| 130 | } |
| 131 | }; |
| 132 | struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn]; |
| 133 | int ret; |
| 134 | unsigned long flags; |
| 135 | |
| 136 | if (agent) { |
| 137 | tmad = kmalloc(sizeof *tmad, GFP_KERNEL); |
| 138 | if (!tmad) |
| 139 | return; |
| 140 | |
| 141 | tmad->mad = kmalloc(sizeof *tmad->mad, GFP_KERNEL); |
| 142 | if (!tmad->mad) { |
| 143 | kfree(tmad); |
| 144 | return; |
| 145 | } |
| 146 | |
| 147 | memcpy(tmad->mad, mad, sizeof *mad); |
| 148 | |
| 149 | wr.wr.ud.mad_hdr = &tmad->mad->mad_hdr; |
| 150 | wr.wr_id = (unsigned long) tmad; |
| 151 | |
| 152 | gather_list.addr = dma_map_single(agent->device->dma_device, |
| 153 | tmad->mad, |
| 154 | sizeof *tmad->mad, |
| 155 | DMA_TO_DEVICE); |
| 156 | gather_list.length = sizeof *tmad->mad; |
| 157 | gather_list.lkey = to_mpd(agent->qp->pd)->ntmr.ibmr.lkey; |
| 158 | pci_unmap_addr_set(tmad, mapping, gather_list.addr); |
| 159 | |
| 160 | /* |
| 161 | * We rely here on the fact that MLX QPs don't use the |
| 162 | * address handle after the send is posted (this is |
| 163 | * wrong following the IB spec strictly, but we know |
| 164 | * it's OK for our devices). |
| 165 | */ |
| 166 | spin_lock_irqsave(&dev->sm_lock, flags); |
| 167 | wr.wr.ud.ah = dev->sm_ah[port_num - 1]; |
| 168 | if (wr.wr.ud.ah) |
| 169 | ret = ib_post_send_mad(agent, &wr, &bad_wr); |
| 170 | else |
| 171 | ret = -EINVAL; |
| 172 | spin_unlock_irqrestore(&dev->sm_lock, flags); |
| 173 | |
| 174 | if (ret) { |
| 175 | dma_unmap_single(agent->device->dma_device, |
| 176 | pci_unmap_addr(tmad, mapping), |
| 177 | sizeof *tmad->mad, |
| 178 | DMA_TO_DEVICE); |
| 179 | kfree(tmad->mad); |
| 180 | kfree(tmad); |
| 181 | } |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | int mthca_process_mad(struct ib_device *ibdev, |
| 186 | int mad_flags, |
| 187 | u8 port_num, |
| 188 | struct ib_wc *in_wc, |
| 189 | struct ib_grh *in_grh, |
| 190 | struct ib_mad *in_mad, |
| 191 | struct ib_mad *out_mad) |
| 192 | { |
| 193 | int err; |
| 194 | u8 status; |
| 195 | u16 slid = in_wc ? in_wc->slid : IB_LID_PERMISSIVE; |
| 196 | |
| 197 | /* Forward locally generated traps to the SM */ |
| 198 | if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && |
| 199 | slid == 0) { |
| 200 | forward_trap(to_mdev(ibdev), port_num, in_mad); |
| 201 | return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Only handle SM gets, sets and trap represses for SM class |
| 206 | * |
| 207 | * Only handle PMA and Mellanox vendor-specific class gets and |
| 208 | * sets for other classes. |
| 209 | */ |
| 210 | if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || |
| 211 | in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { |
| 212 | if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && |
| 213 | in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && |
| 214 | in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) |
| 215 | return IB_MAD_RESULT_SUCCESS; |
| 216 | |
| 217 | /* |
| 218 | * Don't process SMInfo queries or vendor-specific |
| 219 | * MADs -- the SMA can't handle them. |
| 220 | */ |
| 221 | if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || |
| 222 | ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == |
| 223 | IB_SMP_ATTR_VENDOR_MASK)) |
| 224 | return IB_MAD_RESULT_SUCCESS; |
| 225 | } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || |
| 226 | in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 || |
| 227 | in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) { |
| 228 | if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && |
| 229 | in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) |
| 230 | return IB_MAD_RESULT_SUCCESS; |
| 231 | } else |
| 232 | return IB_MAD_RESULT_SUCCESS; |
| 233 | |
| 234 | err = mthca_MAD_IFC(to_mdev(ibdev), |
| 235 | mad_flags & IB_MAD_IGNORE_MKEY, |
| 236 | mad_flags & IB_MAD_IGNORE_BKEY, |
| 237 | port_num, in_wc, in_grh, in_mad, out_mad, |
| 238 | &status); |
| 239 | if (err) { |
| 240 | mthca_err(to_mdev(ibdev), "MAD_IFC failed\n"); |
| 241 | return IB_MAD_RESULT_FAILURE; |
| 242 | } |
| 243 | if (status == MTHCA_CMD_STAT_BAD_PKT) |
| 244 | return IB_MAD_RESULT_SUCCESS; |
| 245 | if (status) { |
| 246 | mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n", |
| 247 | status); |
| 248 | return IB_MAD_RESULT_FAILURE; |
| 249 | } |
| 250 | |
| 251 | if (!out_mad->mad_hdr.status) |
| 252 | smp_snoop(ibdev, port_num, in_mad); |
| 253 | |
| 254 | /* set return bit in status of directed route responses */ |
| 255 | if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) |
| 256 | out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); |
| 257 | |
| 258 | if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) |
| 259 | /* no response for trap repress */ |
| 260 | return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; |
| 261 | |
| 262 | return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; |
| 263 | } |
| 264 | |
| 265 | static void send_handler(struct ib_mad_agent *agent, |
| 266 | struct ib_mad_send_wc *mad_send_wc) |
| 267 | { |
| 268 | struct mthca_trap_mad *tmad = |
| 269 | (void *) (unsigned long) mad_send_wc->wr_id; |
| 270 | |
| 271 | dma_unmap_single(agent->device->dma_device, |
| 272 | pci_unmap_addr(tmad, mapping), |
| 273 | sizeof *tmad->mad, |
| 274 | DMA_TO_DEVICE); |
| 275 | kfree(tmad->mad); |
| 276 | kfree(tmad); |
| 277 | } |
| 278 | |
| 279 | int mthca_create_agents(struct mthca_dev *dev) |
| 280 | { |
| 281 | struct ib_mad_agent *agent; |
| 282 | int p, q; |
| 283 | |
| 284 | spin_lock_init(&dev->sm_lock); |
| 285 | |
| 286 | for (p = 0; p < dev->limits.num_ports; ++p) |
| 287 | for (q = 0; q <= 1; ++q) { |
| 288 | agent = ib_register_mad_agent(&dev->ib_dev, p + 1, |
| 289 | q ? IB_QPT_GSI : IB_QPT_SMI, |
| 290 | NULL, 0, send_handler, |
| 291 | NULL, NULL); |
| 292 | if (IS_ERR(agent)) |
| 293 | goto err; |
| 294 | dev->send_agent[p][q] = agent; |
| 295 | } |
| 296 | |
| 297 | return 0; |
| 298 | |
| 299 | err: |
| 300 | for (p = 0; p < dev->limits.num_ports; ++p) |
| 301 | for (q = 0; q <= 1; ++q) |
| 302 | if (dev->send_agent[p][q]) |
| 303 | ib_unregister_mad_agent(dev->send_agent[p][q]); |
| 304 | |
| 305 | return PTR_ERR(agent); |
| 306 | } |
| 307 | |
| 308 | void mthca_free_agents(struct mthca_dev *dev) |
| 309 | { |
| 310 | struct ib_mad_agent *agent; |
| 311 | int p, q; |
| 312 | |
| 313 | for (p = 0; p < dev->limits.num_ports; ++p) { |
| 314 | for (q = 0; q <= 1; ++q) { |
| 315 | agent = dev->send_agent[p][q]; |
| 316 | dev->send_agent[p][q] = NULL; |
| 317 | ib_unregister_mad_agent(agent); |
| 318 | } |
| 319 | |
| 320 | if (dev->sm_ah[p]) |
| 321 | ib_destroy_ah(dev->sm_ah[p]); |
| 322 | } |
| 323 | } |