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         gather_list.addr = dma_map_single(mad_agent->device->dma_device,
 133                                           &mad_priv->mad,
 134                                           sizeof(mad_priv->mad),
 135                                           DMA_TO_DEVICE);
 136         gather_list.length = sizeof(mad_priv->mad);
 137         gather_list.lkey = mad_agent->mr->lkey;
 138
 139         send_wr.next = NULL;
 140         send_wr.opcode = IB_WR_SEND;
 141         send_wr.sg_list = &gather_list;
 142         send_wr.num_sge = 1;
 143         send_wr.wr.ud.remote_qpn = wc->src_qp; /* DQPN */
 144         send_wr.wr.ud.timeout_ms = 0;
 145         send_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_SOLICITED;
 146
 147         ah_attr.dlid = wc->slid;
 148         ah_attr.port_num = mad_agent->port_num;
 149         ah_attr.src_path_bits = wc->dlid_path_bits;
 150         ah_attr.sl = wc->sl;
 151         ah_attr.static_rate = 0;
 152         ah_attr.ah_flags = 0; /* No GRH */
 153         if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
 154                 if (wc->wc_flags & IB_WC_GRH) {
 155                         ah_attr.ah_flags = IB_AH_GRH;
 156                         /* Should sgid be looked up ? */
 157                         ah_attr.grh.sgid_index = 0;
 158                         ah_attr.grh.hop_limit = grh->hop_limit;
 159                         ah_attr.grh.flow_label = be32_to_cpu(
 160                                 grh->version_tclass_flow)  & 0xfffff;
 161                         ah_attr.grh.traffic_class = (be32_to_cpu(
 162                                 grh->version_tclass_flow) >> 20) & 0xff;
 163                         memcpy(ah_attr.grh.dgid.raw,
 164                                grh->sgid.raw,
 165                                sizeof(ah_attr.grh.dgid));
 166                 }
 167         }
 168
 169         agent_send_wr->ah = ib_create_ah(mad_agent->qp->pd, &ah_attr);
 170         if (IS_ERR(agent_send_wr->ah)) {
 171                 printk(KERN_ERR SPFX "No memory for address handle\n");
 172                 kfree(agent_send_wr);
 173                 goto out;
 174         }
 175
 176         send_wr.wr.ud.ah = agent_send_wr->ah;
 177         if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
 178                 send_wr.wr.ud.pkey_index = wc->pkey_index;
 179                 send_wr.wr.ud.remote_qkey = IB_QP1_QKEY;
 180         } else {        /* for SMPs */
 181                 send_wr.wr.ud.pkey_index = 0;
 182                 send_wr.wr.ud.remote_qkey = 0;
 183         }
 184         send_wr.wr.ud.mad_hdr = &mad_priv->mad.mad.mad_hdr;
 185         send_wr.wr_id = (unsigned long)agent_send_wr;
 186
 187         pci_unmap_addr_set(agent_send_wr, mapping, gather_list.addr);
 188
 189         /* Send */
 190         spin_lock_irqsave(&port_priv->send_list_lock, flags);
 191         if (ib_post_send_mad(mad_agent, &send_wr, &bad_send_wr)) {
 192                 spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
 193                 dma_unmap_single(mad_agent->device->dma_device,
 194                                  pci_unmap_addr(agent_send_wr, mapping),
 195                                  sizeof(mad_priv->mad),
 196                                  DMA_TO_DEVICE);
 197                 ib_destroy_ah(agent_send_wr->ah);
 198                 kfree(agent_send_wr);
 199         } else {
 200                 list_add_tail(&agent_send_wr->send_list,
 201                               &port_priv->send_posted_list);
 202                 spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
 203                 ret = 0;
 204         }
 205
 206 out:
 207         return ret;
 208 }
 209
 210 int agent_send(struct ib_mad_private *mad,
 211                struct ib_grh *grh,
 212                struct ib_wc *wc,
 213                struct ib_device *device,
 214                int port_num)
 215 {
 216         struct ib_agent_port_private *port_priv;
 217         struct ib_mad_agent *mad_agent;
 218
 219         port_priv = ib_get_agent_port(device, port_num, NULL);
 220         if (!port_priv) {
 221                 printk(KERN_DEBUG SPFX "agent_send %s port %d not open\n",
 222                        device->name, port_num);
 223                 return 1;
 224         }
 225
 226         /* Get mad agent based on mgmt_class in MAD */
 227         switch (mad->mad.mad.mad_hdr.mgmt_class) {
 228                 case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
 229                 case IB_MGMT_CLASS_SUBN_LID_ROUTED:
 230                         mad_agent = port_priv->smp_agent;
 231                         break;
 232                 case IB_MGMT_CLASS_PERF_MGMT:
 233                         mad_agent = port_priv->perf_mgmt_agent;
 234                         break;
 235                 default:
 236                         return 1;
 237         }
 238
 239         return agent_mad_send(mad_agent, port_priv, mad, grh, wc);
 240 }
 241
 242 static void agent_send_handler(struct ib_mad_agent *mad_agent,
 243                                struct ib_mad_send_wc *mad_send_wc)
 244 {
 245         struct ib_agent_port_private    *port_priv;
 246         struct ib_agent_send_wr         *agent_send_wr;
 247         unsigned long                   flags;
 248
 249         /* Find matching MAD agent */
 250         port_priv = ib_get_agent_port(NULL, 0, mad_agent);
 251         if (!port_priv) {
 252                 printk(KERN_ERR SPFX "agent_send_handler: no matching MAD "
 253                        "agent %p\n", mad_agent);
 254                 return;
 255         }
 256
 257         agent_send_wr = (struct ib_agent_send_wr *)(unsigned long)mad_send_wc->wr_id;
 258         spin_lock_irqsave(&port_priv->send_list_lock, flags);
 259         /* Remove completed send from posted send MAD list */
 260         list_del(&agent_send_wr->send_list);
 261         spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
 262
 263         dma_unmap_single(mad_agent->device->dma_device,
 264                          pci_unmap_addr(agent_send_wr, mapping),
 265                          sizeof(agent_send_wr->mad->mad),
 266                          DMA_TO_DEVICE);
 267
 268         ib_destroy_ah(agent_send_wr->ah);
 269
 270         /* Release allocated memory */
 271         kmem_cache_free(ib_mad_cache, agent_send_wr->mad);
 272         kfree(agent_send_wr);
 273 }
 274
 275 int ib_agent_port_open(struct ib_device *device, int port_num)
 276 {
 277         int ret;
 278         struct ib_agent_port_private *port_priv;
 279         unsigned long flags;
 280
 281         /* First, check if port already open for SMI */
 282         port_priv = ib_get_agent_port(device, port_num, NULL);
 283         if (port_priv) {
 284                 printk(KERN_DEBUG SPFX "%s port %d already open\n",
 285                        device->name, port_num);
 286                 return 0;
 287         }
 288
 289         /* Create new device info */
 290         port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
 291         if (!port_priv) {
 292                 printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
 293                 ret = -ENOMEM;
 294                 goto error1;
 295         }
 296
 297         memset(port_priv, 0, sizeof *port_priv);
 298         port_priv->port_num = port_num;
 299         spin_lock_init(&port_priv->send_list_lock);
 300         INIT_LIST_HEAD(&port_priv->send_posted_list);
 301
 302         /* Obtain send only MAD agent for SM class (SMI QP) */
 303         port_priv->smp_agent = ib_register_mad_agent(device, port_num,
 304                                                      IB_QPT_SMI,
 305                                                      NULL, 0,
 306                                                     &agent_send_handler,
 307                                                      NULL, NULL);
 308
 309         if (IS_ERR(port_priv->smp_agent)) {
 310                 ret = PTR_ERR(port_priv->smp_agent);
 311                 goto error2;
 312         }
 313
 314         /* Obtain send only MAD agent for PerfMgmt class (GSI QP) */
 315         port_priv->perf_mgmt_agent = ib_register_mad_agent(device, port_num,
 316                                                            IB_QPT_GSI,
 317                                                            NULL, 0,
 318                                                           &agent_send_handler,
 319                                                            NULL, NULL);
 320         if (IS_ERR(port_priv->perf_mgmt_agent)) {
 321                 ret = PTR_ERR(port_priv->perf_mgmt_agent);
 322                 goto error3;
 323         }
 324
 325         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 326         list_add_tail(&port_priv->port_list, &ib_agent_port_list);
 327         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 328
 329         return 0;
 330
 331 error3:
 332         ib_unregister_mad_agent(port_priv->smp_agent);
 333 error2:
 334         kfree(port_priv);
 335 error1:
 336         return ret;
 337 }
 338
 339 int ib_agent_port_close(struct ib_device *device, int port_num)
 340 {
 341         struct ib_agent_port_private *port_priv;
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 345         port_priv = __ib_get_agent_port(device, port_num, NULL);
 346         if (port_priv == NULL) {
 347                 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 348                 printk(KERN_ERR SPFX "Port %d not found\n", port_num);
 349                 return -ENODEV;
 350         }
 351         list_del(&port_priv->port_list);
 352         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 353
 354         ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
 355         ib_unregister_mad_agent(port_priv->smp_agent);
 356         kfree(port_priv);
 357
 358         return 0;
 359 }