LXR linux/drivers/infiniband/hw/mthca/mthca

   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
  35#include <linux/string.h>
  36#include <linux/slab.h>
  37
  38#include <rdma/ib_verbs.h>
  39#include <rdma/ib_mad.h>
  40#include <rdma/ib_smi.h>
  41
  42#include "mthca_dev.h"
  43#include "mthca_cmd.h"
  44
  45enum {
  46        MTHCA_VENDOR_CLASS1 = 0x9,
  47        MTHCA_VENDOR_CLASS2 = 0xa
  48};
  49
  50static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
  51{
  52        struct ib_port_attr *tprops = NULL;
  53        int                  ret;
  54
  55        tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
  56        if (!tprops)
  57                return -ENOMEM;
  58
  59        ret = ib_query_port(&dev->ib_dev, port_num, tprops);
  60        if (ret) {
  61                printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
  62                       ret, dev->ib_dev.name, port_num);
  63                goto out;
  64        }
  65
  66        dev->rate[port_num - 1] = tprops->active_speed *
  67                                  ib_width_enum_to_int(tprops->active_width);
  68
  69out:
  70        kfree(tprops);
  71        return ret;
  72}
  73
  74static void update_sm_ah(struct mthca_dev *dev,
  75                         u8 port_num, u16 lid, u8 sl)
  76{
  77        struct ib_ah *new_ah;
  78        struct rdma_ah_attr ah_attr;
  79        unsigned long flags;
  80
  81        if (!dev->send_agent[port_num - 1][0])
  82                return;
  83
  84        memset(&ah_attr, 0, sizeof ah_attr);
  85        ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num);
  86        rdma_ah_set_dlid(&ah_attr, lid);
  87        rdma_ah_set_sl(&ah_attr, sl);
  88        rdma_ah_set_port_num(&ah_attr, port_num);
  89
  90        new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
  91                                &ah_attr);
  92        if (IS_ERR(new_ah))
  93                return;
  94
  95        spin_lock_irqsave(&dev->sm_lock, flags);
  96        if (dev->sm_ah[port_num - 1])
  97                rdma_destroy_ah(dev->sm_ah[port_num - 1]);
  98        dev->sm_ah[port_num - 1] = new_ah;
  99        spin_unlock_irqrestore(&dev->sm_lock, flags);
 100}
 101
 102/*
 103 * Snoop SM MADs for port info and P_Key table sets, so we can
 104 * synthesize LID change and P_Key change events.
 105 */
 106static void smp_snoop(struct ib_device *ibdev,
 107                      u8 port_num,
 108                      const struct ib_mad *mad,
 109                      u16 prev_lid)
 110{
 111        struct ib_event event;
 112
 113        if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 114             mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 115            mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
 116                if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 117                        struct ib_port_info *pinfo =
 118                                (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 119                        u16 lid = be16_to_cpu(pinfo->lid);
 120
 121                        mthca_update_rate(to_mdev(ibdev), port_num);
 122                        update_sm_ah(to_mdev(ibdev), port_num,
 123                                     be16_to_cpu(pinfo->sm_lid),
 124                                     pinfo->neighbormtu_mastersmsl & 0xf);
 125
 126                        event.device           = ibdev;
 127                        event.element.port_num = port_num;
 128
 129                        if (pinfo->clientrereg_resv_subnetto & 0x80) {
 130                                event.event    = IB_EVENT_CLIENT_REREGISTER;
 131                                ib_dispatch_event(&event);
 132                        }
 133
 134                        if (prev_lid != lid) {
 135                                event.event    = IB_EVENT_LID_CHANGE;
 136                                ib_dispatch_event(&event);
 137                        }
 138                }
 139
 140                if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 141                        event.device           = ibdev;
 142                        event.event            = IB_EVENT_PKEY_CHANGE;
 143                        event.element.port_num = port_num;
 144                        ib_dispatch_event(&event);
 145                }
 146        }
 147}
 148
 149static void node_desc_override(struct ib_device *dev,
 150                               struct ib_mad *mad)
 151{
 152        if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 153             mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 154            mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 155            mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 156                mutex_lock(&to_mdev(dev)->cap_mask_mutex);
 157                memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
 158                       IB_DEVICE_NODE_DESC_MAX);
 159                mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
 160        }
 161}
 162
 163static void forward_trap(struct mthca_dev *dev,
 164                         u8 port_num,
 165                         const struct ib_mad *mad)
 166{
 167        int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 168        struct ib_mad_send_buf *send_buf;
 169        struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 170        int ret;
 171        unsigned long flags;
 172
 173        if (agent) {
 174                send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 175                                              IB_MGMT_MAD_DATA, GFP_ATOMIC,
 176                                              IB_MGMT_BASE_VERSION);
 177                if (IS_ERR(send_buf))
 178                        return;
 179                /*
 180                 * We rely here on the fact that MLX QPs don't use the
 181                 * address handle after the send is posted (this is
 182                 * wrong following the IB spec strictly, but we know
 183                 * it's OK for our devices).
 184                 */
 185                spin_lock_irqsave(&dev->sm_lock, flags);
 186                memcpy(send_buf->mad, mad, sizeof *mad);
 187                if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 188                        ret = ib_post_send_mad(send_buf, NULL);
 189                else
 190                        ret = -EINVAL;
 191                spin_unlock_irqrestore(&dev->sm_lock, flags);
 192
 193                if (ret)
 194                        ib_free_send_mad(send_buf);
 195        }
 196}
 197
 198int mthca_process_mad(struct ib_device *ibdev,
 199                      int mad_flags,
 200                      u8 port_num,
 201                      const struct ib_wc *in_wc,
 202                      const struct ib_grh *in_grh,
 203                      const struct ib_mad_hdr *in, size_t in_mad_size,
 204                      struct ib_mad_hdr *out, size_t *out_mad_size,
 205                      u16 *out_mad_pkey_index)
 206{
 207        int err;
 208        u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 209        u16 prev_lid = 0;
 210        struct ib_port_attr pattr;
 211        const struct ib_mad *in_mad = (const struct ib_mad *)in;
 212        struct ib_mad *out_mad = (struct ib_mad *)out;
 213
 214        if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
 215                         *out_mad_size != sizeof(*out_mad)))
 216                return IB_MAD_RESULT_FAILURE;
 217
 218        /* Forward locally generated traps to the SM */
 219        if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
 220            slid == 0) {
 221                forward_trap(to_mdev(ibdev), port_num, in_mad);
 222                return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 223        }
 224
 225        /*
 226         * Only handle SM gets, sets and trap represses for SM class
 227         *
 228         * Only handle PMA and Mellanox vendor-specific class gets and
 229         * sets for other classes.
 230         */
 231        if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 232            in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 233                if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 234                    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 235                    in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 236                        return IB_MAD_RESULT_SUCCESS;
 237
 238                /*
 239                 * Don't process SMInfo queries or vendor-specific
 240                 * MADs -- the SMA can't handle them.
 241                 */
 242                if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 243                    ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 244                     IB_SMP_ATTR_VENDOR_MASK))
 245                        return IB_MAD_RESULT_SUCCESS;
 246        } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 247                   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 248                   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 249                if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 250                    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 251                        return IB_MAD_RESULT_SUCCESS;
 252        } else
 253                return IB_MAD_RESULT_SUCCESS;
 254        if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 255             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 256            in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
 257            in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
 258            !ib_query_port(ibdev, port_num, &pattr))
 259                prev_lid = pattr.lid;
 260
 261        err = mthca_MAD_IFC(to_mdev(ibdev),
 262                            mad_flags & IB_MAD_IGNORE_MKEY,
 263                            mad_flags & IB_MAD_IGNORE_BKEY,
 264                            port_num, in_wc, in_grh, in_mad, out_mad);
 265        if (err == -EBADMSG)
 266                return IB_MAD_RESULT_SUCCESS;
 267        else if (err) {
 268                mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
 269                return IB_MAD_RESULT_FAILURE;
 270        }
 271
 272        if (!out_mad->mad_hdr.status) {
 273                smp_snoop(ibdev, port_num, in_mad, prev_lid);
 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 mthca_create_agents(struct mthca_dev *dev)
 295{
 296        struct ib_mad_agent *agent;
 297        int p, q;
 298        int ret;
 299
 300        spin_lock_init(&dev->sm_lock);
 301
 302        for (p = 0; p < dev->limits.num_ports; ++p)
 303                for (q = 0; q <= 1; ++q) {
 304                        agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 305                                                      q ? IB_QPT_GSI : IB_QPT_SMI,
 306                                                      NULL, 0, send_handler,
 307                                                      NULL, NULL, 0);
 308                        if (IS_ERR(agent)) {
 309                                ret = PTR_ERR(agent);
 310                                goto err;
 311                        }
 312                        dev->send_agent[p][q] = agent;
 313                }
 314
 315
 316        for (p = 1; p <= dev->limits.num_ports; ++p) {
 317                ret = mthca_update_rate(dev, p);
 318                if (ret) {
 319                        mthca_err(dev, "Failed to obtain port %d rate."
 320                                  " aborting.\n", p);
 321                        goto err;
 322                }
 323        }
 324
 325        return 0;
 326
 327err:
 328        for (p = 0; p < dev->limits.num_ports; ++p)
 329                for (q = 0; q <= 1; ++q)
 330                        if (dev->send_agent[p][q])
 331                                ib_unregister_mad_agent(dev->send_agent[p][q]);
 332
 333        return ret;
 334}
 335
 336void mthca_free_agents(struct mthca_dev *dev)
 337{
 338        struct ib_mad_agent *agent;
 339        int p, q;
 340
 341        for (p = 0; p < dev->limits.num_ports; ++p) {
 342                for (q = 0; q <= 1; ++q) {
 343                        agent = dev->send_agent[p][q];
 344                        dev->send_agent[p][q] = NULL;
 345                        ib_unregister_mad_agent(agent);
 346                }
 347
 348                if (dev->sm_ah[p])
 349                        rdma_destroy_ah(dev->sm_ah[p]);
 350        }
 351}
 352