drivers/infiniband/core/agent.c

   1 /*
   2  * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
   3  * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
   4  * Copyright (c) 2004 Intel Corporation.  All rights reserved.
   5  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   6  * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  *
  36  * $Id: agent.c 1389 2004-12-27 22:56:47Z roland $
  37  */
  38
  39 #include <linux/dma-mapping.h>
  40
  41 #include <asm/bug.h>
  42
  43 #include <ib_smi.h>
  44
  45 #include "smi.h"
  46 #include "agent_priv.h"
  47 #include "mad_priv.h"
  48 #include "agent.h"
  49
  50 spinlock_t ib_agent_port_list_lock;
  51 static LIST_HEAD(ib_agent_port_list);
  52
  53 /*
  54  * Caller must hold ib_agent_port_list_lock
  55  */
  56 static inline struct ib_agent_port_private *
  57 __ib_get_agent_port(struct ib_device *device, int port_num,
  58                     struct ib_mad_agent *mad_agent)
  59 {
  60         struct ib_agent_port_private *entry;
  61
  62         BUG_ON(!(!!device ^ !!mad_agent));  /* Exactly one MUST be (!NULL) */
  63
  64         if (device) {
  65                 list_for_each_entry(entry, &ib_agent_port_list, port_list) {
  66                         if (entry->smp_agent->device == device &&
  67                             entry->port_num == port_num)
  68                                 return entry;
  69                 }
  70         } else {
  71                 list_for_each_entry(entry, &ib_agent_port_list, port_list) {
  72                         if ((entry->smp_agent == mad_agent) ||
  73                             (entry->perf_mgmt_agent == mad_agent))
  74                                 return entry;
  75                 }
  76         }
  77         return NULL;
  78 }
  79
  80 static inline struct ib_agent_port_private *
  81 ib_get_agent_port(struct ib_device *device, int port_num,
  82                   struct ib_mad_agent *mad_agent)
  83 {
  84         struct ib_agent_port_private *entry;
  85         unsigned long flags;
  86
  87         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
  88         entry = __ib_get_agent_port(device, port_num, mad_agent);
  89         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
  90
  91         return entry;
  92 }
  93
  94 int smi_check_local_dr_smp(struct ib_smp *smp,
  95                            struct ib_device *device,
  96                            int port_num)
  97 {
  98         struct ib_agent_port_private *port_priv;
  99
 100         if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 101                 return 1;
 102         port_priv = ib_get_agent_port(device, port_num, NULL);
 103         if (!port_priv) {
 104                 printk(KERN_DEBUG SPFX "smi_check_local_dr_smp %s port %d "
 105                        "not open\n",
 106                        device->name, port_num);
 107                 return 1;
 108         }
 109
 110         return smi_check_local_smp(port_priv->smp_agent, smp);
 111 }
 112
 113 static int agent_mad_send(struct ib_mad_agent *mad_agent,
 114                           struct ib_agent_port_private *port_priv,
 115                           struct ib_mad_private *mad_priv,
 116                           struct ib_grh *grh,
 117                           struct ib_wc *wc)
 118 {
 119         struct ib_agent_send_wr *agent_send_wr;
 120         struct ib_sge gather_list;
 121         struct ib_send_wr send_wr;
 122         struct ib_send_wr *bad_send_wr;
 123         struct ib_ah_attr ah_attr;
 124         unsigned long flags;
 125         int ret = 1;
 126
 127         agent_send_wr = kmalloc(sizeof(*agent_send_wr), GFP_KERNEL);
 128         if (!agent_send_wr)
 129                 goto out;
 130         agent_send_wr->mad = mad_priv;
 131
 132         /* PCI mapping */
 133         gather_list.addr = dma_map_single(mad_agent->device->dma_device,
 134                                           &mad_priv->mad,
 135                                           sizeof(mad_priv->mad),
 136                                           DMA_TO_DEVICE);
 137         gather_list.length = sizeof(mad_priv->mad);
 138         gather_list.lkey = (*port_priv->mr).lkey;
 139
 140         send_wr.next = NULL;
 141         send_wr.opcode = IB_WR_SEND;
 142         send_wr.sg_list = &gather_list;
 143         send_wr.num_sge = 1;
 144         send_wr.wr.ud.remote_qpn = wc->src_qp; /* DQPN */
 145         send_wr.wr.ud.timeout_ms = 0;
 146         send_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_SOLICITED;
 147
 148         ah_attr.dlid = wc->slid;
 149         ah_attr.port_num = mad_agent->port_num;
 150         ah_attr.src_path_bits = wc->dlid_path_bits;
 151         ah_attr.sl = wc->sl;
 152         ah_attr.static_rate = 0;
 153         ah_attr.ah_flags = 0; /* No GRH */
 154         if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
 155                 if (wc->wc_flags & IB_WC_GRH) {
 156                         ah_attr.ah_flags = IB_AH_GRH;
 157                         /* Should sgid be looked up ? */
 158                         ah_attr.grh.sgid_index = 0;
 159                         ah_attr.grh.hop_limit = grh->hop_limit;
 160                         ah_attr.grh.flow_label = be32_to_cpup(
 161                                 &grh->version_tclass_flow)  & 0xfffff;
 162                         ah_attr.grh.traffic_class = (be32_to_cpup(
 163                                 &grh->version_tclass_flow) >> 20) & 0xff;
 164                         memcpy(ah_attr.grh.dgid.raw,
 165                                grh->sgid.raw,
 166                                sizeof(ah_attr.grh.dgid));
 167                 }
 168         }
 169
 170         agent_send_wr->ah = ib_create_ah(mad_agent->qp->pd, &ah_attr);
 171         if (IS_ERR(agent_send_wr->ah)) {
 172                 printk(KERN_ERR SPFX "No memory for address handle\n");
 173                 kfree(agent_send_wr);
 174                 goto out;
 175         }
 176
 177         send_wr.wr.ud.ah = agent_send_wr->ah;
 178         if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
 179                 send_wr.wr.ud.pkey_index = wc->pkey_index;
 180                 send_wr.wr.ud.remote_qkey = IB_QP1_QKEY;
 181         } else {        /* for SMPs */
 182                 send_wr.wr.ud.pkey_index = 0;
 183                 send_wr.wr.ud.remote_qkey = 0;
 184         }
 185         send_wr.wr.ud.mad_hdr = &mad_priv->mad.mad.mad_hdr;
 186         send_wr.wr_id = (unsigned long)agent_send_wr;
 187
 188         pci_unmap_addr_set(agent_send_wr, mapping, gather_list.addr);
 189
 190         /* Send */
 191         spin_lock_irqsave(&port_priv->send_list_lock, flags);
 192         if (ib_post_send_mad(mad_agent, &send_wr, &bad_send_wr)) {
 193                 spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
 194                 dma_unmap_single(mad_agent->device->dma_device,
 195                                  pci_unmap_addr(agent_send_wr, mapping),
 196                                  sizeof(mad_priv->mad),
 197                                  DMA_TO_DEVICE);
 198                 ib_destroy_ah(agent_send_wr->ah);
 199                 kfree(agent_send_wr);
 200         } else {
 201                 list_add_tail(&agent_send_wr->send_list,
 202                               &port_priv->send_posted_list);
 203                 spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
 204                 ret = 0;
 205         }
 206
 207 out:
 208         return ret;
 209 }
 210
 211 int agent_send(struct ib_mad_private *mad,
 212                struct ib_grh *grh,
 213                struct ib_wc *wc,
 214                struct ib_device *device,
 215                int port_num)
 216 {
 217         struct ib_agent_port_private *port_priv;
 218         struct ib_mad_agent *mad_agent;
 219
 220         port_priv = ib_get_agent_port(device, port_num, NULL);
 221         if (!port_priv) {
 222                 printk(KERN_DEBUG SPFX "agent_send %s port %d not open\n",
 223                        device->name, port_num);
 224                 return 1;
 225         }
 226
 227         /* Get mad agent based on mgmt_class in MAD */
 228         switch (mad->mad.mad.mad_hdr.mgmt_class) {
 229                 case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
 230                 case IB_MGMT_CLASS_SUBN_LID_ROUTED:
 231                         mad_agent = port_priv->smp_agent;
 232                         break;
 233                 case IB_MGMT_CLASS_PERF_MGMT:
 234                         mad_agent = port_priv->perf_mgmt_agent;
 235                         break;
 236                 default:
 237                         return 1;
 238         }
 239
 240         return agent_mad_send(mad_agent, port_priv, mad, grh, wc);
 241 }
 242
 243 static void agent_send_handler(struct ib_mad_agent *mad_agent,
 244                                struct ib_mad_send_wc *mad_send_wc)
 245 {
 246         struct ib_agent_port_private    *port_priv;
 247         struct ib_agent_send_wr         *agent_send_wr;
 248         unsigned long                   flags;
 249
 250         /* Find matching MAD agent */
 251         port_priv = ib_get_agent_port(NULL, 0, mad_agent);
 252         if (!port_priv) {
 253                 printk(KERN_ERR SPFX "agent_send_handler: no matching MAD "
 254                        "agent %p\n", mad_agent);
 255                 return;
 256         }
 257
 258         agent_send_wr = (struct ib_agent_send_wr *)(unsigned long)mad_send_wc->wr_id;
 259         spin_lock_irqsave(&port_priv->send_list_lock, flags);
 260         /* Remove completed send from posted send MAD list */
 261         list_del(&agent_send_wr->send_list);
 262         spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
 263
 264         /* Unmap PCI */
 265         dma_unmap_single(mad_agent->device->dma_device,
 266                          pci_unmap_addr(agent_send_wr, mapping),
 267                          sizeof(agent_send_wr->mad->mad),
 268                          DMA_TO_DEVICE);
 269
 270         ib_destroy_ah(agent_send_wr->ah);
 271
 272         /* Release allocated memory */
 273         kmem_cache_free(ib_mad_cache, agent_send_wr->mad);
 274         kfree(agent_send_wr);
 275 }
 276
 277 int ib_agent_port_open(struct ib_device *device, int port_num)
 278 {
 279         int ret;
 280         struct ib_agent_port_private *port_priv;
 281         unsigned long flags;
 282
 283         /* First, check if port already open for SMI */
 284         port_priv = ib_get_agent_port(device, port_num, NULL);
 285         if (port_priv) {
 286                 printk(KERN_DEBUG SPFX "%s port %d already open\n",
 287                        device->name, port_num);
 288                 return 0;
 289         }
 290
 291         /* Create new device info */
 292         port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
 293         if (!port_priv) {
 294                 printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
 295                 ret = -ENOMEM;
 296                 goto error1;
 297         }
 298
 299         memset(port_priv, 0, sizeof *port_priv);
 300         port_priv->port_num = port_num;
 301         spin_lock_init(&port_priv->send_list_lock);
 302         INIT_LIST_HEAD(&port_priv->send_posted_list);
 303
 304         /* Obtain send only MAD agent for SM class (SMI QP) */
 305         port_priv->smp_agent = ib_register_mad_agent(device, port_num,
 306                                                      IB_QPT_SMI,
 307                                                      NULL, 0,
 308                                                     &agent_send_handler,
 309                                                      NULL, NULL);
 310
 311         if (IS_ERR(port_priv->smp_agent)) {
 312                 ret = PTR_ERR(port_priv->smp_agent);
 313                 goto error2;
 314         }
 315
 316         /* Obtain send only MAD agent for PerfMgmt class (GSI QP) */
 317         port_priv->perf_mgmt_agent = ib_register_mad_agent(device, port_num,
 318                                                            IB_QPT_GSI,
 319                                                            NULL, 0,
 320                                                           &agent_send_handler,
 321                                                            NULL, NULL);
 322         if (IS_ERR(port_priv->perf_mgmt_agent)) {
 323                 ret = PTR_ERR(port_priv->perf_mgmt_agent);
 324                 goto error3;
 325         }
 326
 327         port_priv->mr = ib_get_dma_mr(port_priv->smp_agent->qp->pd,
 328                                       IB_ACCESS_LOCAL_WRITE);
 329         if (IS_ERR(port_priv->mr)) {
 330                 printk(KERN_ERR SPFX "Couldn't get DMA MR\n");
 331                 ret = PTR_ERR(port_priv->mr);
 332                 goto error4;
 333         }
 334
 335         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 336         list_add_tail(&port_priv->port_list, &ib_agent_port_list);
 337         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 338
 339         return 0;
 340
 341 error4:
 342         ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
 343 error3:
 344         ib_unregister_mad_agent(port_priv->smp_agent);
 345 error2:
 346         kfree(port_priv);
 347 error1:
 348         return ret;
 349 }
 350
 351 int ib_agent_port_close(struct ib_device *device, int port_num)
 352 {
 353         struct ib_agent_port_private *port_priv;
 354         unsigned long flags;
 355
 356         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 357         port_priv = __ib_get_agent_port(device, port_num, NULL);
 358         if (port_priv == NULL) {
 359                 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 360                 printk(KERN_ERR SPFX "Port %d not found\n", port_num);
 361                 return -ENODEV;
 362         }
 363         list_del(&port_priv->port_list);
 364         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 365
 366         ib_dereg_mr(port_priv->mr);
 367
 368         ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
 369         ib_unregister_mad_agent(port_priv->smp_agent);
 370         kfree(port_priv);
 371
 372         return 0;
 373 }