1/* 2 * Copyright (c) 2007 Cisco Systems, Inc. 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 33#include <rdma/ib_mad.h> 34#include <rdma/ib_smi.h> 35 36#include <linux/mlx4/cmd.h> 37 38#include "mlx4_ib.h" 39 40enum { 41 MLX4_IB_VENDOR_CLASS1 = 0x9, 42 MLX4_IB_VENDOR_CLASS2 = 0xa 43}; 44 45int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey, 46 int port, struct ib_wc *in_wc, struct ib_grh *in_grh, 47 void *in_mad, void *response_mad) 48{ 49 struct mlx4_cmd_mailbox *inmailbox, *outmailbox; 50 void *inbox; 51 int err; 52 u32 in_modifier = port; 53 u8 op_modifier = 0; 54 55 inmailbox = mlx4_alloc_cmd_mailbox(dev->dev); 56 if (IS_ERR(inmailbox)) 57 return PTR_ERR(inmailbox); 58 inbox = inmailbox->buf; 59 60 outmailbox = mlx4_alloc_cmd_mailbox(dev->dev); 61 if (IS_ERR(outmailbox)) { 62 mlx4_free_cmd_mailbox(dev->dev, inmailbox); 63 return PTR_ERR(outmailbox); 64 } 65 66 memcpy(inbox, in_mad, 256); 67 68 /* 69 * Key check traps can't be generated unless we have in_wc to 70 * tell us where to send the trap. 71 */ 72 if (ignore_mkey || !in_wc) 73 op_modifier |= 0x1; 74 if (ignore_bkey || !in_wc) 75 op_modifier |= 0x2; 76 77 if (in_wc) { 78 struct { 79 __be32 my_qpn; 80 u32 reserved1; 81 __be32 rqpn; 82 u8 sl; 83 u8 g_path; 84 u16 reserved2[2]; 85 __be16 pkey; 86 u32 reserved3[11]; 87 u8 grh[40]; 88 } *ext_info; 89 90 memset(inbox + 256, 0, 256); 91 ext_info = inbox + 256; 92 93 ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num); 94 ext_info->rqpn = cpu_to_be32(in_wc->src_qp); 95 ext_info->sl = in_wc->sl << 4; 96 ext_info->g_path = in_wc->dlid_path_bits | 97 (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0); 98 ext_info->pkey = cpu_to_be16(in_wc->pkey_index); 99 100 if (in_grh) 101 memcpy(ext_info->grh, in_grh, 40); 102 103 op_modifier |= 0x4; 104 105 in_modifier |= in_wc->slid << 16; 106 } 107 108 err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma, 109 in_modifier, op_modifier, 110 MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C); 111 112 if (!err); 113 memcpy(response_mad, outmailbox->buf, 256); 114 115 mlx4_free_cmd_mailbox(dev->dev, inmailbox); 116 mlx4_free_cmd_mailbox(dev->dev, outmailbox); 117 118 return err; 119} 120 121static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl) 122{ 123 struct ib_ah *new_ah; 124 struct ib_ah_attr ah_attr; 125 126 if (!dev->send_agent[port_num - 1][0]) 127 return; 128 129 memset(&ah_attr, 0, sizeof ah_attr); 130 ah_attr.dlid = lid; 131 ah_attr.sl = sl; 132 ah_attr.port_num = port_num; 133 134 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd, 135 &ah_attr); 136 if (IS_ERR(new_ah)) 137 return; 138 139 spin_lock(&dev->sm_lock); 140 if (dev->sm_ah[port_num - 1]) 141 ib_destroy_ah(dev->sm_ah[port_num - 1]); 142 dev->sm_ah[port_num - 1] = new_ah; 143 spin_unlock(&dev->sm_lock); 144} 145 146/* 147 * Snoop SM MADs for port info and P_Key table sets, so we can 148 * synthesize LID change and P_Key change events. 149 */ 150static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad) 151{ 152 struct ib_event event; 153 154 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 155 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 156 mad->mad_hdr.method == IB_MGMT_METHOD_SET) { 157 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) { 158 struct ib_port_info *pinfo = 159 (struct ib_port_info *) ((struct ib_smp *) mad)->data; 160 161 update_sm_ah(to_mdev(ibdev), port_num, 162 be16_to_cpu(pinfo->sm_lid), 163 pinfo->neighbormtu_mastersmsl & 0xf); 164 165 event.device = ibdev; 166 event.element.port_num = port_num; 167 168 if(pinfo->clientrereg_resv_subnetto & 0x80) 169 event.event = IB_EVENT_CLIENT_REREGISTER; 170 else 171 event.event = IB_EVENT_LID_CHANGE; 172 173 ib_dispatch_event(&event); 174 } 175 176 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) { 177 event.device = ibdev; 178 event.event = IB_EVENT_PKEY_CHANGE; 179 event.element.port_num = port_num; 180 ib_dispatch_event(&event); 181 } 182 } 183} 184 185static void node_desc_override(struct ib_device *dev, 186 struct ib_mad *mad) 187{ 188 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 189 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 190 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP && 191 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) { 192 spin_lock(&to_mdev(dev)->sm_lock); 193 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64); 194 spin_unlock(&to_mdev(dev)->sm_lock); 195 } 196} 197 198static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad) 199{ 200 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED; 201 struct ib_mad_send_buf *send_buf; 202 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn]; 203 int ret; 204 205 if (agent) { 206 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR, 207 IB_MGMT_MAD_DATA, GFP_ATOMIC); 208 /* 209 * We rely here on the fact that MLX QPs don't use the 210 * address handle after the send is posted (this is 211 * wrong following the IB spec strictly, but we know 212 * it's OK for our devices). 213 */ 214 spin_lock(&dev->sm_lock); 215 memcpy(send_buf->mad, mad, sizeof *mad); 216 if ((send_buf->ah = dev->sm_ah[port_num - 1])) 217 ret = ib_post_send_mad(send_buf, NULL); 218 else 219 ret = -EINVAL; 220 spin_unlock(&dev->sm_lock); 221 222 if (ret) 223 ib_free_send_mad(send_buf); 224 } 225} 226 227int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num, 228 struct ib_wc *in_wc, struct ib_grh *in_grh, 229 struct ib_mad *in_mad, struct ib_mad *out_mad) 230{ 231 u16 slid; 232 int err; 233 234 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE); 235 236 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) { 237 forward_trap(to_mdev(ibdev), port_num, in_mad); 238 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 239 } 240 241 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 242 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 243 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 244 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && 245 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) 246 return IB_MAD_RESULT_SUCCESS; 247 248 /* 249 * Don't process SMInfo queries or vendor-specific 250 * MADs -- the SMA can't handle them. 251 */ 252 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || 253 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == 254 IB_SMP_ATTR_VENDOR_MASK)) 255 return IB_MAD_RESULT_SUCCESS; 256 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || 257 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1 || 258 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2) { 259 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 260 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) 261 return IB_MAD_RESULT_SUCCESS; 262 } else 263 return IB_MAD_RESULT_SUCCESS; 264 265 err = mlx4_MAD_IFC(to_mdev(ibdev), 266 mad_flags & IB_MAD_IGNORE_MKEY, 267 mad_flags & IB_MAD_IGNORE_BKEY, 268 port_num, in_wc, in_grh, in_mad, out_mad); 269 if (err) 270 return IB_MAD_RESULT_FAILURE; 271 272 if (!out_mad->mad_hdr.status) { 273 smp_snoop(ibdev, port_num, in_mad); 274 node_desc_override(ibdev, out_mad); 275 } 276 277 /* set return bit in status of directed route responses */ 278 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 279 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); 280 281 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) 282 /* no response for trap repress */ 283 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 284 285 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; 286} 287 288static void send_handler(struct ib_mad_agent *agent, 289 struct ib_mad_send_wc *mad_send_wc) 290{ 291 ib_free_send_mad(mad_send_wc->send_buf); 292} 293 294int mlx4_ib_mad_init(struct mlx4_ib_dev *dev) 295{ 296 struct ib_mad_agent *agent; 297 int p, q; 298 int ret; 299 300 for (p = 0; p < dev->dev->caps.num_ports; ++p) 301 for (q = 0; q <= 1; ++q) { 302 agent = ib_register_mad_agent(&dev->ib_dev, p + 1, 303 q ? IB_QPT_GSI : IB_QPT_SMI, 304 NULL, 0, send_handler, 305 NULL, NULL); 306 if (IS_ERR(agent)) { 307 ret = PTR_ERR(agent); 308 goto err; 309 } 310 dev->send_agent[p][q] = agent; 311 } 312 313 return 0; 314 315err: 316 for (p = 0; p < dev->dev->caps.num_ports; ++p) 317 for (q = 0; q <= 1; ++q) 318 if (dev->send_agent[p][q]) 319 ib_unregister_mad_agent(dev->send_agent[p][q]); 320 321 return ret; 322} 323 324void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev) 325{ 326 struct ib_mad_agent *agent; 327 int p, q; 328 329 for (p = 0; p < dev->dev->caps.num_ports; ++p) { 330 for (q = 0; q <= 1; ++q) { 331 agent = dev->send_agent[p][q]; 332 dev->send_agent[p][q] = NULL; 333 ib_unregister_mad_agent(agent); 334 } 335 336 if (dev->sm_ah[p]) 337 ib_destroy_ah(dev->sm_ah[p]); 338 } 339} 340