hw/mthca/mthca_mad.c

0001 /*
0002  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
0003  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
0004  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
0005  *
0006  * This software is available to you under a choice of one of two
0007  * licenses.  You may choose to be licensed under the terms of the GNU
0008  * General Public License (GPL) Version 2, available from the file
0009  * COPYING in the main directory of this source tree, or the
0010  * OpenIB.org BSD license below:
0011  *
0012  *     Redistribution and use in source and binary forms, with or
0013  *     without modification, are permitted provided that the following
0014  *     conditions are met:
0015  *
0016  *      - Redistributions of source code must retain the above
0017  *        copyright notice, this list of conditions and the following
0018  *        disclaimer.
0019  *
0020  *      - Redistributions in binary form must reproduce the above
0021  *        copyright notice, this list of conditions and the following
0022  *        disclaimer in the documentation and/or other materials
0023  *        provided with the distribution.
0024  *
0025  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0026  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0027  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0028  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0029  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0030  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0031  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0032  * SOFTWARE.
0033  */
0034
0035 #include <linux/string.h>
0036 #include <linux/slab.h>
0037
0038 #include <rdma/ib_verbs.h>
0039 #include <rdma/ib_mad.h>
0040 #include <rdma/ib_smi.h>
0041
0042 #include "mthca_dev.h"
0043 #include "mthca_cmd.h"
0044
0045 enum {
0046     MTHCA_VENDOR_CLASS1 = 0x9,
0047     MTHCA_VENDOR_CLASS2 = 0xa
0048 };
0049
0050 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
0051 {
0052     struct ib_port_attr *tprops = NULL;
0053     int                  ret;
0054
0055     tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
0056     if (!tprops)
0057         return -ENOMEM;
0058
0059     ret = ib_query_port(&dev->ib_dev, port_num, tprops);
0060     if (ret) {
0061         dev_warn(&dev->ib_dev.dev,
0062              "ib_query_port failed (%d) forport %d\n", ret,
0063              port_num);
0064         goto out;
0065     }
0066
0067     dev->rate[port_num - 1] = tprops->active_speed *
0068                   ib_width_enum_to_int(tprops->active_width);
0069
0070 out:
0071     kfree(tprops);
0072     return ret;
0073 }
0074
0075 static void update_sm_ah(struct mthca_dev *dev,
0076              u8 port_num, u16 lid, u8 sl)
0077 {
0078     struct ib_ah *new_ah;
0079     struct rdma_ah_attr ah_attr;
0080     unsigned long flags;
0081
0082     if (!dev->send_agent[port_num - 1][0])
0083         return;
0084
0085     memset(&ah_attr, 0, sizeof ah_attr);
0086     ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num);
0087     rdma_ah_set_dlid(&ah_attr, lid);
0088     rdma_ah_set_sl(&ah_attr, sl);
0089     rdma_ah_set_port_num(&ah_attr, port_num);
0090
0091     new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
0092                 &ah_attr, 0);
0093     if (IS_ERR(new_ah))
0094         return;
0095
0096     spin_lock_irqsave(&dev->sm_lock, flags);
0097     if (dev->sm_ah[port_num - 1])
0098         rdma_destroy_ah(dev->sm_ah[port_num - 1], 0);
0099     dev->sm_ah[port_num - 1] = new_ah;
0100     spin_unlock_irqrestore(&dev->sm_lock, flags);
0101 }
0102
0103 /*
0104  * Snoop SM MADs for port info and P_Key table sets, so we can
0105  * synthesize LID change and P_Key change events.
0106  */
0107 static void smp_snoop(struct ib_device *ibdev,
0108               u8 port_num,
0109               const struct ib_mad *mad,
0110               u16 prev_lid)
0111 {
0112     struct ib_event event;
0113
0114     if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
0115          mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
0116         mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
0117         if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
0118             struct ib_port_info *pinfo =
0119                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
0120             u16 lid = be16_to_cpu(pinfo->lid);
0121
0122             mthca_update_rate(to_mdev(ibdev), port_num);
0123             update_sm_ah(to_mdev(ibdev), port_num,
0124                      be16_to_cpu(pinfo->sm_lid),
0125                      pinfo->neighbormtu_mastersmsl & 0xf);
0126
0127             event.device           = ibdev;
0128             event.element.port_num = port_num;
0129
0130             if (pinfo->clientrereg_resv_subnetto & 0x80) {
0131                 event.event    = IB_EVENT_CLIENT_REREGISTER;
0132                 ib_dispatch_event(&event);
0133             }
0134
0135             if (prev_lid != lid) {
0136                 event.event    = IB_EVENT_LID_CHANGE;
0137                 ib_dispatch_event(&event);
0138             }
0139         }
0140
0141         if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
0142             event.device           = ibdev;
0143             event.event            = IB_EVENT_PKEY_CHANGE;
0144             event.element.port_num = port_num;
0145             ib_dispatch_event(&event);
0146         }
0147     }
0148 }
0149
0150 static void node_desc_override(struct ib_device *dev,
0151                    struct ib_mad *mad)
0152 {
0153     if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
0154          mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
0155         mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
0156         mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
0157         mutex_lock(&to_mdev(dev)->cap_mask_mutex);
0158         memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
0159                IB_DEVICE_NODE_DESC_MAX);
0160         mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
0161     }
0162 }
0163
0164 static void forward_trap(struct mthca_dev *dev,
0165              u32 port_num,
0166              const struct ib_mad *mad)
0167 {
0168     int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
0169     struct ib_mad_send_buf *send_buf;
0170     struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
0171     int ret;
0172     unsigned long flags;
0173
0174     if (agent) {
0175         send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
0176                           IB_MGMT_MAD_DATA, GFP_ATOMIC,
0177                           IB_MGMT_BASE_VERSION);
0178         if (IS_ERR(send_buf))
0179             return;
0180         /*
0181          * We rely here on the fact that MLX QPs don't use the
0182          * address handle after the send is posted (this is
0183          * wrong following the IB spec strictly, but we know
0184          * it's OK for our devices).
0185          */
0186         spin_lock_irqsave(&dev->sm_lock, flags);
0187         memcpy(send_buf->mad, mad, sizeof *mad);
0188         if ((send_buf->ah = dev->sm_ah[port_num - 1]))
0189             ret = ib_post_send_mad(send_buf, NULL);
0190         else
0191             ret = -EINVAL;
0192         spin_unlock_irqrestore(&dev->sm_lock, flags);
0193
0194         if (ret)
0195             ib_free_send_mad(send_buf);
0196     }
0197 }
0198
0199 int mthca_process_mad(struct ib_device *ibdev, int mad_flags, u32 port_num,
0200               const struct ib_wc *in_wc, const struct ib_grh *in_grh,
0201               const struct ib_mad *in, struct ib_mad *out,
0202               size_t *out_mad_size, u16 *out_mad_pkey_index)
0203 {
0204     int err;
0205     u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
0206     u16 prev_lid = 0;
0207     struct ib_port_attr pattr;
0208
0209     /* Forward locally generated traps to the SM */
0210     if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP && !slid) {
0211         forward_trap(to_mdev(ibdev), port_num, in);
0212         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
0213     }
0214
0215     /*
0216      * Only handle SM gets, sets and trap represses for SM class
0217      *
0218      * Only handle PMA and Mellanox vendor-specific class gets and
0219      * sets for other classes.
0220      */
0221     if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
0222         in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
0223         if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&
0224             in->mad_hdr.method != IB_MGMT_METHOD_SET &&
0225             in->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
0226             return IB_MAD_RESULT_SUCCESS;
0227
0228         /*
0229          * Don't process SMInfo queries or vendor-specific
0230          * MADs -- the SMA can't handle them.
0231          */
0232         if (in->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
0233             ((in->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
0234              IB_SMP_ATTR_VENDOR_MASK))
0235             return IB_MAD_RESULT_SUCCESS;
0236     } else if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
0237            in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
0238            in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
0239         if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&
0240             in->mad_hdr.method != IB_MGMT_METHOD_SET)
0241             return IB_MAD_RESULT_SUCCESS;
0242     } else
0243         return IB_MAD_RESULT_SUCCESS;
0244     if ((in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
0245          in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
0246         in->mad_hdr.method == IB_MGMT_METHOD_SET &&
0247         in->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
0248         !ib_query_port(ibdev, port_num, &pattr))
0249         prev_lid = ib_lid_cpu16(pattr.lid);
0250
0251     err = mthca_MAD_IFC(to_mdev(ibdev), mad_flags & IB_MAD_IGNORE_MKEY,
0252                 mad_flags & IB_MAD_IGNORE_BKEY, port_num, in_wc,
0253                 in_grh, in, out);
0254     if (err == -EBADMSG)
0255         return IB_MAD_RESULT_SUCCESS;
0256     else if (err) {
0257         mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
0258         return IB_MAD_RESULT_FAILURE;
0259     }
0260
0261     if (!out->mad_hdr.status) {
0262         smp_snoop(ibdev, port_num, in, prev_lid);
0263         node_desc_override(ibdev, out);
0264     }
0265
0266     /* set return bit in status of directed route responses */
0267     if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
0268         out->mad_hdr.status |= cpu_to_be16(1 << 15);
0269
0270     if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
0271         /* no response for trap repress */
0272         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
0273
0274     return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
0275 }
0276
0277 static void send_handler(struct ib_mad_agent *agent,
0278              struct ib_mad_send_wc *mad_send_wc)
0279 {
0280     ib_free_send_mad(mad_send_wc->send_buf);
0281 }
0282
0283 int mthca_create_agents(struct mthca_dev *dev)
0284 {
0285     struct ib_mad_agent *agent;
0286     int p, q;
0287     int ret;
0288
0289     spin_lock_init(&dev->sm_lock);
0290
0291     for (p = 0; p < dev->limits.num_ports; ++p)
0292         for (q = 0; q <= 1; ++q) {
0293             agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
0294                               q ? IB_QPT_GSI : IB_QPT_SMI,
0295                               NULL, 0, send_handler,
0296                               NULL, NULL, 0);
0297             if (IS_ERR(agent)) {
0298                 ret = PTR_ERR(agent);
0299                 goto err;
0300             }
0301             dev->send_agent[p][q] = agent;
0302         }
0303
0304
0305     for (p = 1; p <= dev->limits.num_ports; ++p) {
0306         ret = mthca_update_rate(dev, p);
0307         if (ret) {
0308             mthca_err(dev, "Failed to obtain port %d rate."
0309                   " aborting.\n", p);
0310             goto err;
0311         }
0312     }
0313
0314     return 0;
0315
0316 err:
0317     for (p = 0; p < dev->limits.num_ports; ++p)
0318         for (q = 0; q <= 1; ++q)
0319             if (dev->send_agent[p][q])
0320                 ib_unregister_mad_agent(dev->send_agent[p][q]);
0321
0322     return ret;
0323 }
0324
0325 void mthca_free_agents(struct mthca_dev *dev)
0326 {
0327     struct ib_mad_agent *agent;
0328     int p, q;
0329
0330     for (p = 0; p < dev->limits.num_ports; ++p) {
0331         for (q = 0; q <= 1; ++q) {
0332             agent = dev->send_agent[p][q];
0333             dev->send_agent[p][q] = NULL;
0334             ib_unregister_mad_agent(agent);
0335         }
0336
0337         if (dev->sm_ah[p])
0338             rdma_destroy_ah(dev->sm_ah[p],
0339                     RDMA_DESTROY_AH_SLEEPABLE);
0340     }
0341 }