342 lines · c
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 two7 * licenses. You may choose to be licensed under the terms of the GNU8 * General Public License (GPL) Version 2, available from the file9 * COPYING in the main directory of this source tree, or the10 * OpenIB.org BSD license below:11 *12 * Redistribution and use in source and binary forms, with or13 * without modification, are permitted provided that the following14 * conditions are met:15 *16 * - Redistributions of source code must retain the above17 * copyright notice, this list of conditions and the following18 * disclaimer.19 *20 * - Redistributions in binary form must reproduce the above21 * copyright notice, this list of conditions and the following22 * disclaimer in the documentation and/or other materials23 * 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 OF27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE32 * 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 = 0xa48};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 dev_warn(&dev->ib_dev.dev,62 "ib_query_port failed (%d) forport %d\n", ret,63 port_num);64 goto out;65 }66 67 dev->rate[port_num - 1] = tprops->active_speed *68 ib_width_enum_to_int(tprops->active_width);69 70out:71 kfree(tprops);72 return ret;73}74 75static void update_sm_ah(struct mthca_dev *dev,76 u8 port_num, u16 lid, u8 sl)77{78 struct ib_ah *new_ah;79 struct rdma_ah_attr ah_attr;80 unsigned long flags;81 82 if (!dev->send_agent[port_num - 1][0])83 return;84 85 memset(&ah_attr, 0, sizeof ah_attr);86 ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num);87 rdma_ah_set_dlid(&ah_attr, lid);88 rdma_ah_set_sl(&ah_attr, sl);89 rdma_ah_set_port_num(&ah_attr, port_num);90 91 new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,92 &ah_attr, 0);93 if (IS_ERR(new_ah))94 return;95 96 spin_lock_irqsave(&dev->sm_lock, flags);97 if (dev->sm_ah[port_num - 1])98 rdma_destroy_ah(dev->sm_ah[port_num - 1], 0);99 dev->sm_ah[port_num - 1] = new_ah;100 spin_unlock_irqrestore(&dev->sm_lock, flags);101}102 103/*104 * Snoop SM MADs for port info and P_Key table sets, so we can105 * synthesize LID change and P_Key change events.106 */107static void smp_snoop(struct ib_device *ibdev,108 u8 port_num,109 const struct ib_mad *mad,110 u16 prev_lid)111{112 struct ib_event event;113 114 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||115 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&116 mad->mad_hdr.method == IB_MGMT_METHOD_SET) {117 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {118 struct ib_port_info *pinfo =119 (struct ib_port_info *) ((struct ib_smp *) mad)->data;120 u16 lid = be16_to_cpu(pinfo->lid);121 122 mthca_update_rate(to_mdev(ibdev), port_num);123 update_sm_ah(to_mdev(ibdev), port_num,124 be16_to_cpu(pinfo->sm_lid),125 pinfo->neighbormtu_mastersmsl & 0xf);126 127 event.device = ibdev;128 event.element.port_num = port_num;129 130 if (pinfo->clientrereg_resv_subnetto & 0x80) {131 event.event = IB_EVENT_CLIENT_REREGISTER;132 ib_dispatch_event(&event);133 }134 135 if (prev_lid != lid) {136 event.event = IB_EVENT_LID_CHANGE;137 ib_dispatch_event(&event);138 }139 }140 141 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {142 event.device = ibdev;143 event.event = IB_EVENT_PKEY_CHANGE;144 event.element.port_num = port_num;145 ib_dispatch_event(&event);146 }147 }148}149 150static void node_desc_override(struct ib_device *dev,151 struct ib_mad *mad)152{153 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||154 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&155 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&156 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {157 mutex_lock(&to_mdev(dev)->cap_mask_mutex);158 memcpy(((struct ib_smp *) mad)->data, dev->node_desc,159 IB_DEVICE_NODE_DESC_MAX);160 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);161 }162}163 164static void forward_trap(struct mthca_dev *dev,165 u32 port_num,166 const struct ib_mad *mad)167{168 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;169 struct ib_mad_send_buf *send_buf;170 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];171 int ret;172 unsigned long flags;173 174 if (agent) {175 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,176 IB_MGMT_MAD_DATA, GFP_ATOMIC,177 IB_MGMT_BASE_VERSION);178 if (IS_ERR(send_buf))179 return;180 /*181 * We rely here on the fact that MLX QPs don't use the182 * address handle after the send is posted (this is183 * wrong following the IB spec strictly, but we know184 * it's OK for our devices).185 */186 spin_lock_irqsave(&dev->sm_lock, flags);187 memcpy(send_buf->mad, mad, sizeof *mad);188 if ((send_buf->ah = dev->sm_ah[port_num - 1]))189 ret = ib_post_send_mad(send_buf, NULL);190 else191 ret = -EINVAL;192 spin_unlock_irqrestore(&dev->sm_lock, flags);193 194 if (ret)195 ib_free_send_mad(send_buf);196 }197}198 199int mthca_process_mad(struct ib_device *ibdev, int mad_flags, u32 port_num,200 const struct ib_wc *in_wc, const struct ib_grh *in_grh,201 const struct ib_mad *in, struct ib_mad *out,202 size_t *out_mad_size, u16 *out_mad_pkey_index)203{204 int err;205 u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);206 u16 prev_lid = 0;207 struct ib_port_attr pattr;208 209 /* Forward locally generated traps to the SM */210 if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP && !slid) {211 forward_trap(to_mdev(ibdev), port_num, in);212 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;213 }214 215 /*216 * Only handle SM gets, sets and trap represses for SM class217 *218 * Only handle PMA and Mellanox vendor-specific class gets and219 * sets for other classes.220 */221 if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||222 in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {223 if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&224 in->mad_hdr.method != IB_MGMT_METHOD_SET &&225 in->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)226 return IB_MAD_RESULT_SUCCESS;227 228 /*229 * Don't process SMInfo queries or vendor-specific230 * MADs -- the SMA can't handle them.231 */232 if (in->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||233 ((in->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==234 IB_SMP_ATTR_VENDOR_MASK))235 return IB_MAD_RESULT_SUCCESS;236 } else if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||237 in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 ||238 in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {239 if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&240 in->mad_hdr.method != IB_MGMT_METHOD_SET)241 return IB_MAD_RESULT_SUCCESS;242 } else243 return IB_MAD_RESULT_SUCCESS;244 if ((in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||245 in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&246 in->mad_hdr.method == IB_MGMT_METHOD_SET &&247 in->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&248 !ib_query_port(ibdev, port_num, &pattr))249 prev_lid = ib_lid_cpu16(pattr.lid);250 251 err = mthca_MAD_IFC(to_mdev(ibdev), mad_flags & IB_MAD_IGNORE_MKEY,252 mad_flags & IB_MAD_IGNORE_BKEY, port_num, in_wc,253 in_grh, in, out);254 if (err == -EBADMSG)255 return IB_MAD_RESULT_SUCCESS;256 else if (err) {257 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);258 return IB_MAD_RESULT_FAILURE;259 }260 261 if (!out->mad_hdr.status) {262 smp_snoop(ibdev, port_num, in, prev_lid);263 node_desc_override(ibdev, out);264 }265 266 /* set return bit in status of directed route responses */267 if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)268 out->mad_hdr.status |= cpu_to_be16(1 << 15);269 270 if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)271 /* no response for trap repress */272 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;273 274 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;275}276 277static void send_handler(struct ib_mad_agent *agent,278 struct ib_mad_send_wc *mad_send_wc)279{280 ib_free_send_mad(mad_send_wc->send_buf);281}282 283int mthca_create_agents(struct mthca_dev *dev)284{285 struct ib_mad_agent *agent;286 int p, q;287 int ret;288 289 spin_lock_init(&dev->sm_lock);290 291 for (p = 0; p < dev->limits.num_ports; ++p)292 for (q = 0; q <= 1; ++q) {293 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,294 q ? IB_QPT_GSI : IB_QPT_SMI,295 NULL, 0, send_handler,296 NULL, NULL, 0);297 if (IS_ERR(agent)) {298 ret = PTR_ERR(agent);299 goto err;300 }301 dev->send_agent[p][q] = agent;302 }303 304 305 for (p = 1; p <= dev->limits.num_ports; ++p) {306 ret = mthca_update_rate(dev, p);307 if (ret) {308 mthca_err(dev, "Failed to obtain port %d rate."309 " aborting.\n", p);310 goto err;311 }312 }313 314 return 0;315 316err:317 for (p = 0; p < dev->limits.num_ports; ++p)318 for (q = 0; q <= 1; ++q)319 if (dev->send_agent[p][q])320 ib_unregister_mad_agent(dev->send_agent[p][q]);321 322 return ret;323}324 325void mthca_free_agents(struct mthca_dev *dev)326{327 struct ib_mad_agent *agent;328 int p, q;329 330 for (p = 0; p < dev->limits.num_ports; ++p) {331 for (q = 0; q <= 1; ++q) {332 agent = dev->send_agent[p][q];333 dev->send_agent[p][q] = NULL;334 ib_unregister_mad_agent(agent);335 }336 337 if (dev->sm_ah[p])338 rdma_destroy_ah(dev->sm_ah[p],339 RDMA_DESTROY_AH_SLEEPABLE);340 }341}342