Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2012 Mellanox Technologies. All rights reserved. |
| 3 | * |
| 4 | * This software is available to you under a choice of one of two |
| 5 | * licenses. You may choose to be licensed under the terms of the GNU |
| 6 | * General Public License (GPL) Version 2, available from the file |
| 7 | * COPYING in the main directory of this source tree, or the |
| 8 | * OpenIB.org BSD license below: |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or |
| 11 | * without modification, are permitted provided that the following |
| 12 | * conditions are met: |
| 13 | * |
| 14 | * - Redistributions of source code must retain the above |
| 15 | * copyright notice, this list of conditions and the following |
| 16 | * disclaimer. |
| 17 | * |
| 18 | * - Redistributions in binary form must reproduce the above |
| 19 | * copyright notice, this list of conditions and the following |
| 20 | * disclaimer in the documentation and/or other materials |
| 21 | * provided with the distribution. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 30 | * SOFTWARE. |
| 31 | */ |
| 32 | |
| 33 | #include <rdma/ib_mad.h> |
| 34 | #include <rdma/ib_smi.h> |
| 35 | #include <rdma/ib_cache.h> |
| 36 | #include <rdma/ib_sa.h> |
| 37 | |
| 38 | #include <linux/mlx4/cmd.h> |
| 39 | #include <linux/rbtree.h> |
| 40 | #include <linux/delay.h> |
| 41 | |
| 42 | #include "mlx4_ib.h" |
| 43 | |
| 44 | #define MAX_VFS 80 |
| 45 | #define MAX_PEND_REQS_PER_FUNC 4 |
| 46 | #define MAD_TIMEOUT_MS 2000 |
| 47 | |
| 48 | #define mcg_warn(fmt, arg...) pr_warn("MCG WARNING: " fmt, ##arg) |
| 49 | #define mcg_error(fmt, arg...) pr_err(fmt, ##arg) |
| 50 | #define mcg_warn_group(group, format, arg...) \ |
| 51 | pr_warn("%s-%d: %16s (port %d): WARNING: " format, __func__, __LINE__,\ |
| 52 | (group)->name, group->demux->port, ## arg) |
| 53 | |
| 54 | #define mcg_error_group(group, format, arg...) \ |
| 55 | pr_err(" %16s: " format, (group)->name, ## arg) |
| 56 | |
| 57 | |
| 58 | static union ib_gid mgid0; |
| 59 | |
| 60 | static struct workqueue_struct *clean_wq; |
| 61 | |
| 62 | enum mcast_state { |
| 63 | MCAST_NOT_MEMBER = 0, |
| 64 | MCAST_MEMBER, |
| 65 | }; |
| 66 | |
| 67 | enum mcast_group_state { |
| 68 | MCAST_IDLE, |
| 69 | MCAST_JOIN_SENT, |
| 70 | MCAST_LEAVE_SENT, |
| 71 | MCAST_RESP_READY |
| 72 | }; |
| 73 | |
| 74 | struct mcast_member { |
| 75 | enum mcast_state state; |
| 76 | uint8_t join_state; |
| 77 | int num_pend_reqs; |
| 78 | struct list_head pending; |
| 79 | }; |
| 80 | |
| 81 | struct ib_sa_mcmember_data { |
| 82 | union ib_gid mgid; |
| 83 | union ib_gid port_gid; |
| 84 | __be32 qkey; |
| 85 | __be16 mlid; |
| 86 | u8 mtusel_mtu; |
| 87 | u8 tclass; |
| 88 | __be16 pkey; |
| 89 | u8 ratesel_rate; |
| 90 | u8 lifetmsel_lifetm; |
| 91 | __be32 sl_flowlabel_hoplimit; |
| 92 | u8 scope_join_state; |
| 93 | u8 proxy_join; |
| 94 | u8 reserved[2]; |
| 95 | }; |
| 96 | |
| 97 | struct mcast_group { |
| 98 | struct ib_sa_mcmember_data rec; |
| 99 | struct rb_node node; |
| 100 | struct list_head mgid0_list; |
| 101 | struct mlx4_ib_demux_ctx *demux; |
| 102 | struct mcast_member func[MAX_VFS]; |
| 103 | struct mutex lock; |
| 104 | struct work_struct work; |
| 105 | struct list_head pending_list; |
| 106 | int members[3]; |
| 107 | enum mcast_group_state state; |
| 108 | enum mcast_group_state prev_state; |
| 109 | struct ib_sa_mad response_sa_mad; |
| 110 | __be64 last_req_tid; |
| 111 | |
| 112 | char name[33]; /* MGID string */ |
Jack Morgenstein | c1e7e46 | 2012-08-03 08:40:51 +0000 | [diff] [blame] | 113 | struct device_attribute dentry; |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 114 | |
| 115 | /* refcount is the reference count for the following: |
| 116 | 1. Each queued request |
| 117 | 2. Each invocation of the worker thread |
| 118 | 3. Membership of the port at the SA |
| 119 | */ |
| 120 | atomic_t refcount; |
| 121 | |
| 122 | /* delayed work to clean pending SM request */ |
| 123 | struct delayed_work timeout_work; |
| 124 | struct list_head cleanup_list; |
| 125 | }; |
| 126 | |
| 127 | struct mcast_req { |
| 128 | int func; |
| 129 | struct ib_sa_mad sa_mad; |
| 130 | struct list_head group_list; |
| 131 | struct list_head func_list; |
| 132 | struct mcast_group *group; |
| 133 | int clean; |
| 134 | }; |
| 135 | |
| 136 | |
| 137 | #define safe_atomic_dec(ref) \ |
| 138 | do {\ |
| 139 | if (atomic_dec_and_test(ref)) \ |
| 140 | mcg_warn_group(group, "did not expect to reach zero\n"); \ |
| 141 | } while (0) |
| 142 | |
| 143 | static const char *get_state_string(enum mcast_group_state state) |
| 144 | { |
| 145 | switch (state) { |
| 146 | case MCAST_IDLE: |
| 147 | return "MCAST_IDLE"; |
| 148 | case MCAST_JOIN_SENT: |
| 149 | return "MCAST_JOIN_SENT"; |
| 150 | case MCAST_LEAVE_SENT: |
| 151 | return "MCAST_LEAVE_SENT"; |
| 152 | case MCAST_RESP_READY: |
| 153 | return "MCAST_RESP_READY"; |
| 154 | } |
| 155 | return "Invalid State"; |
| 156 | } |
| 157 | |
| 158 | static struct mcast_group *mcast_find(struct mlx4_ib_demux_ctx *ctx, |
| 159 | union ib_gid *mgid) |
| 160 | { |
| 161 | struct rb_node *node = ctx->mcg_table.rb_node; |
| 162 | struct mcast_group *group; |
| 163 | int ret; |
| 164 | |
| 165 | while (node) { |
| 166 | group = rb_entry(node, struct mcast_group, node); |
| 167 | ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid); |
| 168 | if (!ret) |
| 169 | return group; |
| 170 | |
| 171 | if (ret < 0) |
| 172 | node = node->rb_left; |
| 173 | else |
| 174 | node = node->rb_right; |
| 175 | } |
| 176 | return NULL; |
| 177 | } |
| 178 | |
| 179 | static struct mcast_group *mcast_insert(struct mlx4_ib_demux_ctx *ctx, |
| 180 | struct mcast_group *group) |
| 181 | { |
| 182 | struct rb_node **link = &ctx->mcg_table.rb_node; |
| 183 | struct rb_node *parent = NULL; |
| 184 | struct mcast_group *cur_group; |
| 185 | int ret; |
| 186 | |
| 187 | while (*link) { |
| 188 | parent = *link; |
| 189 | cur_group = rb_entry(parent, struct mcast_group, node); |
| 190 | |
| 191 | ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw, |
| 192 | sizeof group->rec.mgid); |
| 193 | if (ret < 0) |
| 194 | link = &(*link)->rb_left; |
| 195 | else if (ret > 0) |
| 196 | link = &(*link)->rb_right; |
| 197 | else |
| 198 | return cur_group; |
| 199 | } |
| 200 | rb_link_node(&group->node, parent, link); |
| 201 | rb_insert_color(&group->node, &ctx->mcg_table); |
| 202 | return NULL; |
| 203 | } |
| 204 | |
| 205 | static int send_mad_to_wire(struct mlx4_ib_demux_ctx *ctx, struct ib_mad *mad) |
| 206 | { |
| 207 | struct mlx4_ib_dev *dev = ctx->dev; |
| 208 | struct ib_ah_attr ah_attr; |
Jack Morgenstein | 90c1d8b | 2015-07-30 17:34:21 +0300 | [diff] [blame^] | 209 | unsigned long flags; |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 210 | |
Jack Morgenstein | 90c1d8b | 2015-07-30 17:34:21 +0300 | [diff] [blame^] | 211 | spin_lock_irqsave(&dev->sm_lock, flags); |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 212 | if (!dev->sm_ah[ctx->port - 1]) { |
| 213 | /* port is not yet Active, sm_ah not ready */ |
Jack Morgenstein | 90c1d8b | 2015-07-30 17:34:21 +0300 | [diff] [blame^] | 214 | spin_unlock_irqrestore(&dev->sm_lock, flags); |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 215 | return -EAGAIN; |
| 216 | } |
| 217 | mlx4_ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr); |
Jack Morgenstein | 90c1d8b | 2015-07-30 17:34:21 +0300 | [diff] [blame^] | 218 | spin_unlock_irqrestore(&dev->sm_lock, flags); |
Jack Morgenstein | 5ea8bbf | 2014-03-12 12:00:41 +0200 | [diff] [blame] | 219 | return mlx4_ib_send_to_wire(dev, mlx4_master_func_num(dev->dev), |
| 220 | ctx->port, IB_QPT_GSI, 0, 1, IB_QP1_QKEY, |
| 221 | &ah_attr, NULL, mad); |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | static int send_mad_to_slave(int slave, struct mlx4_ib_demux_ctx *ctx, |
| 225 | struct ib_mad *mad) |
| 226 | { |
| 227 | struct mlx4_ib_dev *dev = ctx->dev; |
| 228 | struct ib_mad_agent *agent = dev->send_agent[ctx->port - 1][1]; |
| 229 | struct ib_wc wc; |
| 230 | struct ib_ah_attr ah_attr; |
| 231 | |
| 232 | /* Our agent might not yet be registered when mads start to arrive */ |
| 233 | if (!agent) |
| 234 | return -EAGAIN; |
| 235 | |
| 236 | ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr); |
| 237 | |
Jack Morgenstein | 2c75d2c | 2012-10-17 16:42:58 +0000 | [diff] [blame] | 238 | if (ib_find_cached_pkey(&dev->ib_dev, ctx->port, IB_DEFAULT_PKEY_FULL, &wc.pkey_index)) |
| 239 | return -EINVAL; |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 240 | wc.sl = 0; |
| 241 | wc.dlid_path_bits = 0; |
| 242 | wc.port_num = ctx->port; |
| 243 | wc.slid = ah_attr.dlid; /* opensm lid */ |
| 244 | wc.src_qp = 1; |
| 245 | return mlx4_ib_send_to_slave(dev, slave, ctx->port, IB_QPT_GSI, &wc, NULL, mad); |
| 246 | } |
| 247 | |
| 248 | static int send_join_to_wire(struct mcast_group *group, struct ib_sa_mad *sa_mad) |
| 249 | { |
| 250 | struct ib_sa_mad mad; |
| 251 | struct ib_sa_mcmember_data *sa_mad_data = (struct ib_sa_mcmember_data *)&mad.data; |
| 252 | int ret; |
| 253 | |
| 254 | /* we rely on a mad request as arrived from a VF */ |
| 255 | memcpy(&mad, sa_mad, sizeof mad); |
| 256 | |
| 257 | /* fix port GID to be the real one (slave 0) */ |
| 258 | sa_mad_data->port_gid.global.interface_id = group->demux->guid_cache[0]; |
| 259 | |
| 260 | /* assign our own TID */ |
| 261 | mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux); |
| 262 | group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */ |
| 263 | |
| 264 | ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad); |
| 265 | /* set timeout handler */ |
| 266 | if (!ret) { |
| 267 | /* calls mlx4_ib_mcg_timeout_handler */ |
| 268 | queue_delayed_work(group->demux->mcg_wq, &group->timeout_work, |
| 269 | msecs_to_jiffies(MAD_TIMEOUT_MS)); |
| 270 | } |
| 271 | |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | static int send_leave_to_wire(struct mcast_group *group, u8 join_state) |
| 276 | { |
| 277 | struct ib_sa_mad mad; |
| 278 | struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data; |
| 279 | int ret; |
| 280 | |
| 281 | memset(&mad, 0, sizeof mad); |
| 282 | mad.mad_hdr.base_version = 1; |
| 283 | mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; |
| 284 | mad.mad_hdr.class_version = 2; |
| 285 | mad.mad_hdr.method = IB_SA_METHOD_DELETE; |
| 286 | mad.mad_hdr.status = cpu_to_be16(0); |
| 287 | mad.mad_hdr.class_specific = cpu_to_be16(0); |
| 288 | mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux); |
| 289 | group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */ |
| 290 | mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); |
| 291 | mad.mad_hdr.attr_mod = cpu_to_be32(0); |
| 292 | mad.sa_hdr.sm_key = 0x0; |
| 293 | mad.sa_hdr.attr_offset = cpu_to_be16(7); |
| 294 | mad.sa_hdr.comp_mask = IB_SA_MCMEMBER_REC_MGID | |
| 295 | IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE; |
| 296 | |
| 297 | *sa_data = group->rec; |
| 298 | sa_data->scope_join_state = join_state; |
| 299 | |
| 300 | ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad); |
| 301 | if (ret) |
| 302 | group->state = MCAST_IDLE; |
| 303 | |
| 304 | /* set timeout handler */ |
| 305 | if (!ret) { |
| 306 | /* calls mlx4_ib_mcg_timeout_handler */ |
| 307 | queue_delayed_work(group->demux->mcg_wq, &group->timeout_work, |
| 308 | msecs_to_jiffies(MAD_TIMEOUT_MS)); |
| 309 | } |
| 310 | |
| 311 | return ret; |
| 312 | } |
| 313 | |
| 314 | static int send_reply_to_slave(int slave, struct mcast_group *group, |
| 315 | struct ib_sa_mad *req_sa_mad, u16 status) |
| 316 | { |
| 317 | struct ib_sa_mad mad; |
| 318 | struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data; |
| 319 | struct ib_sa_mcmember_data *req_sa_data = (struct ib_sa_mcmember_data *)&req_sa_mad->data; |
| 320 | int ret; |
| 321 | |
| 322 | memset(&mad, 0, sizeof mad); |
| 323 | mad.mad_hdr.base_version = 1; |
| 324 | mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; |
| 325 | mad.mad_hdr.class_version = 2; |
| 326 | mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP; |
| 327 | mad.mad_hdr.status = cpu_to_be16(status); |
| 328 | mad.mad_hdr.class_specific = cpu_to_be16(0); |
| 329 | mad.mad_hdr.tid = req_sa_mad->mad_hdr.tid; |
| 330 | *(u8 *)&mad.mad_hdr.tid = 0; /* resetting tid to 0 */ |
| 331 | mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); |
| 332 | mad.mad_hdr.attr_mod = cpu_to_be32(0); |
| 333 | mad.sa_hdr.sm_key = req_sa_mad->sa_hdr.sm_key; |
| 334 | mad.sa_hdr.attr_offset = cpu_to_be16(7); |
| 335 | mad.sa_hdr.comp_mask = 0; /* ignored on responses, see IBTA spec */ |
| 336 | |
| 337 | *sa_data = group->rec; |
| 338 | |
| 339 | /* reconstruct VF's requested join_state and port_gid */ |
| 340 | sa_data->scope_join_state &= 0xf0; |
| 341 | sa_data->scope_join_state |= (group->func[slave].join_state & 0x0f); |
| 342 | memcpy(&sa_data->port_gid, &req_sa_data->port_gid, sizeof req_sa_data->port_gid); |
| 343 | |
| 344 | ret = send_mad_to_slave(slave, group->demux, (struct ib_mad *)&mad); |
| 345 | return ret; |
| 346 | } |
| 347 | |
| 348 | static int check_selector(ib_sa_comp_mask comp_mask, |
| 349 | ib_sa_comp_mask selector_mask, |
| 350 | ib_sa_comp_mask value_mask, |
| 351 | u8 src_value, u8 dst_value) |
| 352 | { |
| 353 | int err; |
| 354 | u8 selector = dst_value >> 6; |
| 355 | dst_value &= 0x3f; |
| 356 | src_value &= 0x3f; |
| 357 | |
| 358 | if (!(comp_mask & selector_mask) || !(comp_mask & value_mask)) |
| 359 | return 0; |
| 360 | |
| 361 | switch (selector) { |
| 362 | case IB_SA_GT: |
| 363 | err = (src_value <= dst_value); |
| 364 | break; |
| 365 | case IB_SA_LT: |
| 366 | err = (src_value >= dst_value); |
| 367 | break; |
| 368 | case IB_SA_EQ: |
| 369 | err = (src_value != dst_value); |
| 370 | break; |
| 371 | default: |
| 372 | err = 0; |
| 373 | break; |
| 374 | } |
| 375 | |
| 376 | return err; |
| 377 | } |
| 378 | |
| 379 | static u16 cmp_rec(struct ib_sa_mcmember_data *src, |
| 380 | struct ib_sa_mcmember_data *dst, ib_sa_comp_mask comp_mask) |
| 381 | { |
| 382 | /* src is group record, dst is request record */ |
| 383 | /* MGID must already match */ |
| 384 | /* Port_GID we always replace to our Port_GID, so it is a match */ |
| 385 | |
| 386 | #define MAD_STATUS_REQ_INVALID 0x0200 |
| 387 | if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey) |
| 388 | return MAD_STATUS_REQ_INVALID; |
| 389 | if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid) |
| 390 | return MAD_STATUS_REQ_INVALID; |
| 391 | if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR, |
| 392 | IB_SA_MCMEMBER_REC_MTU, |
| 393 | src->mtusel_mtu, dst->mtusel_mtu)) |
| 394 | return MAD_STATUS_REQ_INVALID; |
| 395 | if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS && |
| 396 | src->tclass != dst->tclass) |
| 397 | return MAD_STATUS_REQ_INVALID; |
| 398 | if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey) |
| 399 | return MAD_STATUS_REQ_INVALID; |
| 400 | if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR, |
| 401 | IB_SA_MCMEMBER_REC_RATE, |
| 402 | src->ratesel_rate, dst->ratesel_rate)) |
| 403 | return MAD_STATUS_REQ_INVALID; |
| 404 | if (check_selector(comp_mask, |
| 405 | IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR, |
| 406 | IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME, |
| 407 | src->lifetmsel_lifetm, dst->lifetmsel_lifetm)) |
| 408 | return MAD_STATUS_REQ_INVALID; |
| 409 | if (comp_mask & IB_SA_MCMEMBER_REC_SL && |
| 410 | (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0xf0000000) != |
| 411 | (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0xf0000000)) |
| 412 | return MAD_STATUS_REQ_INVALID; |
| 413 | if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL && |
| 414 | (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x0fffff00) != |
| 415 | (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x0fffff00)) |
| 416 | return MAD_STATUS_REQ_INVALID; |
| 417 | if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT && |
| 418 | (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x000000ff) != |
| 419 | (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x000000ff)) |
| 420 | return MAD_STATUS_REQ_INVALID; |
| 421 | if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && |
| 422 | (src->scope_join_state & 0xf0) != |
| 423 | (dst->scope_join_state & 0xf0)) |
| 424 | return MAD_STATUS_REQ_INVALID; |
| 425 | |
| 426 | /* join_state checked separately, proxy_join ignored */ |
| 427 | |
| 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | /* release group, return 1 if this was last release and group is destroyed |
| 432 | * timout work is canceled sync */ |
| 433 | static int release_group(struct mcast_group *group, int from_timeout_handler) |
| 434 | { |
| 435 | struct mlx4_ib_demux_ctx *ctx = group->demux; |
| 436 | int nzgroup; |
| 437 | |
| 438 | mutex_lock(&ctx->mcg_table_lock); |
| 439 | mutex_lock(&group->lock); |
| 440 | if (atomic_dec_and_test(&group->refcount)) { |
| 441 | if (!from_timeout_handler) { |
| 442 | if (group->state != MCAST_IDLE && |
| 443 | !cancel_delayed_work(&group->timeout_work)) { |
| 444 | atomic_inc(&group->refcount); |
| 445 | mutex_unlock(&group->lock); |
| 446 | mutex_unlock(&ctx->mcg_table_lock); |
| 447 | return 0; |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0); |
Jack Morgenstein | c1e7e46 | 2012-08-03 08:40:51 +0000 | [diff] [blame] | 452 | if (nzgroup) |
| 453 | del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 454 | if (!list_empty(&group->pending_list)) |
| 455 | mcg_warn_group(group, "releasing a group with non empty pending list\n"); |
| 456 | if (nzgroup) |
| 457 | rb_erase(&group->node, &ctx->mcg_table); |
| 458 | list_del_init(&group->mgid0_list); |
| 459 | mutex_unlock(&group->lock); |
| 460 | mutex_unlock(&ctx->mcg_table_lock); |
| 461 | kfree(group); |
| 462 | return 1; |
| 463 | } else { |
| 464 | mutex_unlock(&group->lock); |
| 465 | mutex_unlock(&ctx->mcg_table_lock); |
| 466 | } |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | static void adjust_membership(struct mcast_group *group, u8 join_state, int inc) |
| 471 | { |
| 472 | int i; |
| 473 | |
| 474 | for (i = 0; i < 3; i++, join_state >>= 1) |
| 475 | if (join_state & 0x1) |
| 476 | group->members[i] += inc; |
| 477 | } |
| 478 | |
| 479 | static u8 get_leave_state(struct mcast_group *group) |
| 480 | { |
| 481 | u8 leave_state = 0; |
| 482 | int i; |
| 483 | |
| 484 | for (i = 0; i < 3; i++) |
| 485 | if (!group->members[i]) |
| 486 | leave_state |= (1 << i); |
| 487 | |
| 488 | return leave_state & (group->rec.scope_join_state & 7); |
| 489 | } |
| 490 | |
| 491 | static int join_group(struct mcast_group *group, int slave, u8 join_mask) |
| 492 | { |
| 493 | int ret = 0; |
| 494 | u8 join_state; |
| 495 | |
| 496 | /* remove bits that slave is already member of, and adjust */ |
| 497 | join_state = join_mask & (~group->func[slave].join_state); |
| 498 | adjust_membership(group, join_state, 1); |
| 499 | group->func[slave].join_state |= join_state; |
| 500 | if (group->func[slave].state != MCAST_MEMBER && join_state) { |
| 501 | group->func[slave].state = MCAST_MEMBER; |
| 502 | ret = 1; |
| 503 | } |
| 504 | return ret; |
| 505 | } |
| 506 | |
| 507 | static int leave_group(struct mcast_group *group, int slave, u8 leave_state) |
| 508 | { |
| 509 | int ret = 0; |
| 510 | |
| 511 | adjust_membership(group, leave_state, -1); |
| 512 | group->func[slave].join_state &= ~leave_state; |
| 513 | if (!group->func[slave].join_state) { |
| 514 | group->func[slave].state = MCAST_NOT_MEMBER; |
| 515 | ret = 1; |
| 516 | } |
| 517 | return ret; |
| 518 | } |
| 519 | |
| 520 | static int check_leave(struct mcast_group *group, int slave, u8 leave_mask) |
| 521 | { |
| 522 | if (group->func[slave].state != MCAST_MEMBER) |
| 523 | return MAD_STATUS_REQ_INVALID; |
| 524 | |
| 525 | /* make sure we're not deleting unset bits */ |
| 526 | if (~group->func[slave].join_state & leave_mask) |
| 527 | return MAD_STATUS_REQ_INVALID; |
| 528 | |
| 529 | if (!leave_mask) |
| 530 | return MAD_STATUS_REQ_INVALID; |
| 531 | |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | static void mlx4_ib_mcg_timeout_handler(struct work_struct *work) |
| 536 | { |
| 537 | struct delayed_work *delay = to_delayed_work(work); |
| 538 | struct mcast_group *group; |
| 539 | struct mcast_req *req = NULL; |
| 540 | |
| 541 | group = container_of(delay, typeof(*group), timeout_work); |
| 542 | |
| 543 | mutex_lock(&group->lock); |
| 544 | if (group->state == MCAST_JOIN_SENT) { |
| 545 | if (!list_empty(&group->pending_list)) { |
| 546 | req = list_first_entry(&group->pending_list, struct mcast_req, group_list); |
| 547 | list_del(&req->group_list); |
| 548 | list_del(&req->func_list); |
| 549 | --group->func[req->func].num_pend_reqs; |
| 550 | mutex_unlock(&group->lock); |
| 551 | kfree(req); |
| 552 | if (memcmp(&group->rec.mgid, &mgid0, sizeof mgid0)) { |
| 553 | if (release_group(group, 1)) |
| 554 | return; |
| 555 | } else { |
| 556 | kfree(group); |
| 557 | return; |
| 558 | } |
| 559 | mutex_lock(&group->lock); |
| 560 | } else |
| 561 | mcg_warn_group(group, "DRIVER BUG\n"); |
| 562 | } else if (group->state == MCAST_LEAVE_SENT) { |
| 563 | if (group->rec.scope_join_state & 7) |
| 564 | group->rec.scope_join_state &= 0xf8; |
| 565 | group->state = MCAST_IDLE; |
| 566 | mutex_unlock(&group->lock); |
| 567 | if (release_group(group, 1)) |
| 568 | return; |
| 569 | mutex_lock(&group->lock); |
| 570 | } else |
| 571 | mcg_warn_group(group, "invalid state %s\n", get_state_string(group->state)); |
| 572 | group->state = MCAST_IDLE; |
| 573 | atomic_inc(&group->refcount); |
| 574 | if (!queue_work(group->demux->mcg_wq, &group->work)) |
| 575 | safe_atomic_dec(&group->refcount); |
| 576 | |
| 577 | mutex_unlock(&group->lock); |
| 578 | } |
| 579 | |
| 580 | static int handle_leave_req(struct mcast_group *group, u8 leave_mask, |
| 581 | struct mcast_req *req) |
| 582 | { |
| 583 | u16 status; |
| 584 | |
| 585 | if (req->clean) |
| 586 | leave_mask = group->func[req->func].join_state; |
| 587 | |
| 588 | status = check_leave(group, req->func, leave_mask); |
| 589 | if (!status) |
| 590 | leave_group(group, req->func, leave_mask); |
| 591 | |
| 592 | if (!req->clean) |
| 593 | send_reply_to_slave(req->func, group, &req->sa_mad, status); |
| 594 | --group->func[req->func].num_pend_reqs; |
| 595 | list_del(&req->group_list); |
| 596 | list_del(&req->func_list); |
| 597 | kfree(req); |
| 598 | return 1; |
| 599 | } |
| 600 | |
| 601 | static int handle_join_req(struct mcast_group *group, u8 join_mask, |
| 602 | struct mcast_req *req) |
| 603 | { |
| 604 | u8 group_join_state = group->rec.scope_join_state & 7; |
| 605 | int ref = 0; |
| 606 | u16 status; |
| 607 | struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data; |
| 608 | |
| 609 | if (join_mask == (group_join_state & join_mask)) { |
| 610 | /* port's membership need not change */ |
| 611 | status = cmp_rec(&group->rec, sa_data, req->sa_mad.sa_hdr.comp_mask); |
| 612 | if (!status) |
| 613 | join_group(group, req->func, join_mask); |
| 614 | |
| 615 | --group->func[req->func].num_pend_reqs; |
| 616 | send_reply_to_slave(req->func, group, &req->sa_mad, status); |
| 617 | list_del(&req->group_list); |
| 618 | list_del(&req->func_list); |
| 619 | kfree(req); |
| 620 | ++ref; |
| 621 | } else { |
| 622 | /* port's membership needs to be updated */ |
| 623 | group->prev_state = group->state; |
| 624 | if (send_join_to_wire(group, &req->sa_mad)) { |
| 625 | --group->func[req->func].num_pend_reqs; |
| 626 | list_del(&req->group_list); |
| 627 | list_del(&req->func_list); |
| 628 | kfree(req); |
| 629 | ref = 1; |
| 630 | group->state = group->prev_state; |
| 631 | } else |
| 632 | group->state = MCAST_JOIN_SENT; |
| 633 | } |
| 634 | |
| 635 | return ref; |
| 636 | } |
| 637 | |
| 638 | static void mlx4_ib_mcg_work_handler(struct work_struct *work) |
| 639 | { |
| 640 | struct mcast_group *group; |
| 641 | struct mcast_req *req = NULL; |
| 642 | struct ib_sa_mcmember_data *sa_data; |
| 643 | u8 req_join_state; |
| 644 | int rc = 1; /* release_count - this is for the scheduled work */ |
| 645 | u16 status; |
| 646 | u8 method; |
| 647 | |
| 648 | group = container_of(work, typeof(*group), work); |
| 649 | |
| 650 | mutex_lock(&group->lock); |
| 651 | |
| 652 | /* First, let's see if a response from SM is waiting regarding this group. |
| 653 | * If so, we need to update the group's REC. If this is a bad response, we |
| 654 | * may need to send a bad response to a VF waiting for it. If VF is waiting |
| 655 | * and this is a good response, the VF will be answered later in this func. */ |
| 656 | if (group->state == MCAST_RESP_READY) { |
| 657 | /* cancels mlx4_ib_mcg_timeout_handler */ |
| 658 | cancel_delayed_work(&group->timeout_work); |
| 659 | status = be16_to_cpu(group->response_sa_mad.mad_hdr.status); |
| 660 | method = group->response_sa_mad.mad_hdr.method; |
| 661 | if (group->last_req_tid != group->response_sa_mad.mad_hdr.tid) { |
| 662 | mcg_warn_group(group, "Got MAD response to existing MGID but wrong TID, dropping. Resp TID=%llx, group TID=%llx\n", |
| 663 | be64_to_cpu(group->response_sa_mad.mad_hdr.tid), |
| 664 | be64_to_cpu(group->last_req_tid)); |
| 665 | group->state = group->prev_state; |
| 666 | goto process_requests; |
| 667 | } |
| 668 | if (status) { |
| 669 | if (!list_empty(&group->pending_list)) |
| 670 | req = list_first_entry(&group->pending_list, |
| 671 | struct mcast_req, group_list); |
| 672 | if ((method == IB_MGMT_METHOD_GET_RESP)) { |
| 673 | if (req) { |
| 674 | send_reply_to_slave(req->func, group, &req->sa_mad, status); |
| 675 | --group->func[req->func].num_pend_reqs; |
| 676 | list_del(&req->group_list); |
| 677 | list_del(&req->func_list); |
| 678 | kfree(req); |
| 679 | ++rc; |
| 680 | } else |
| 681 | mcg_warn_group(group, "no request for failed join\n"); |
| 682 | } else if (method == IB_SA_METHOD_DELETE_RESP && group->demux->flushing) |
| 683 | ++rc; |
| 684 | } else { |
| 685 | u8 resp_join_state; |
| 686 | u8 cur_join_state; |
| 687 | |
| 688 | resp_join_state = ((struct ib_sa_mcmember_data *) |
| 689 | group->response_sa_mad.data)->scope_join_state & 7; |
| 690 | cur_join_state = group->rec.scope_join_state & 7; |
| 691 | |
| 692 | if (method == IB_MGMT_METHOD_GET_RESP) { |
| 693 | /* successfull join */ |
| 694 | if (!cur_join_state && resp_join_state) |
| 695 | --rc; |
| 696 | } else if (!resp_join_state) |
| 697 | ++rc; |
| 698 | memcpy(&group->rec, group->response_sa_mad.data, sizeof group->rec); |
| 699 | } |
| 700 | group->state = MCAST_IDLE; |
| 701 | } |
| 702 | |
| 703 | process_requests: |
| 704 | /* We should now go over pending join/leave requests, as long as we are idle. */ |
| 705 | while (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) { |
| 706 | req = list_first_entry(&group->pending_list, struct mcast_req, |
| 707 | group_list); |
| 708 | sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data; |
| 709 | req_join_state = sa_data->scope_join_state & 0x7; |
| 710 | |
| 711 | /* For a leave request, we will immediately answer the VF, and |
| 712 | * update our internal counters. The actual leave will be sent |
| 713 | * to SM later, if at all needed. We dequeue the request now. */ |
| 714 | if (req->sa_mad.mad_hdr.method == IB_SA_METHOD_DELETE) |
| 715 | rc += handle_leave_req(group, req_join_state, req); |
| 716 | else |
| 717 | rc += handle_join_req(group, req_join_state, req); |
| 718 | } |
| 719 | |
| 720 | /* Handle leaves */ |
| 721 | if (group->state == MCAST_IDLE) { |
| 722 | req_join_state = get_leave_state(group); |
| 723 | if (req_join_state) { |
| 724 | group->rec.scope_join_state &= ~req_join_state; |
| 725 | group->prev_state = group->state; |
| 726 | if (send_leave_to_wire(group, req_join_state)) { |
| 727 | group->state = group->prev_state; |
| 728 | ++rc; |
| 729 | } else |
| 730 | group->state = MCAST_LEAVE_SENT; |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | if (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) |
| 735 | goto process_requests; |
| 736 | mutex_unlock(&group->lock); |
| 737 | |
| 738 | while (rc--) |
| 739 | release_group(group, 0); |
| 740 | } |
| 741 | |
| 742 | static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx *ctx, |
| 743 | __be64 tid, |
| 744 | union ib_gid *new_mgid) |
| 745 | { |
| 746 | struct mcast_group *group = NULL, *cur_group; |
| 747 | struct mcast_req *req; |
| 748 | struct list_head *pos; |
| 749 | struct list_head *n; |
| 750 | |
| 751 | mutex_lock(&ctx->mcg_table_lock); |
| 752 | list_for_each_safe(pos, n, &ctx->mcg_mgid0_list) { |
| 753 | group = list_entry(pos, struct mcast_group, mgid0_list); |
| 754 | mutex_lock(&group->lock); |
| 755 | if (group->last_req_tid == tid) { |
| 756 | if (memcmp(new_mgid, &mgid0, sizeof mgid0)) { |
| 757 | group->rec.mgid = *new_mgid; |
| 758 | sprintf(group->name, "%016llx%016llx", |
| 759 | be64_to_cpu(group->rec.mgid.global.subnet_prefix), |
| 760 | be64_to_cpu(group->rec.mgid.global.interface_id)); |
| 761 | list_del_init(&group->mgid0_list); |
| 762 | cur_group = mcast_insert(ctx, group); |
| 763 | if (cur_group) { |
| 764 | /* A race between our code and SM. Silently cleaning the new one */ |
| 765 | req = list_first_entry(&group->pending_list, |
| 766 | struct mcast_req, group_list); |
| 767 | --group->func[req->func].num_pend_reqs; |
| 768 | list_del(&req->group_list); |
| 769 | list_del(&req->func_list); |
| 770 | kfree(req); |
| 771 | mutex_unlock(&group->lock); |
| 772 | mutex_unlock(&ctx->mcg_table_lock); |
| 773 | release_group(group, 0); |
| 774 | return NULL; |
| 775 | } |
| 776 | |
| 777 | atomic_inc(&group->refcount); |
Jack Morgenstein | c1e7e46 | 2012-08-03 08:40:51 +0000 | [diff] [blame] | 778 | add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 779 | mutex_unlock(&group->lock); |
| 780 | mutex_unlock(&ctx->mcg_table_lock); |
| 781 | return group; |
| 782 | } else { |
| 783 | struct mcast_req *tmp1, *tmp2; |
| 784 | |
| 785 | list_del(&group->mgid0_list); |
| 786 | if (!list_empty(&group->pending_list) && group->state != MCAST_IDLE) |
| 787 | cancel_delayed_work_sync(&group->timeout_work); |
| 788 | |
| 789 | list_for_each_entry_safe(tmp1, tmp2, &group->pending_list, group_list) { |
| 790 | list_del(&tmp1->group_list); |
| 791 | kfree(tmp1); |
| 792 | } |
| 793 | mutex_unlock(&group->lock); |
| 794 | mutex_unlock(&ctx->mcg_table_lock); |
| 795 | kfree(group); |
| 796 | return NULL; |
| 797 | } |
| 798 | } |
| 799 | mutex_unlock(&group->lock); |
| 800 | } |
| 801 | mutex_unlock(&ctx->mcg_table_lock); |
| 802 | |
| 803 | return NULL; |
| 804 | } |
| 805 | |
Jack Morgenstein | c1e7e46 | 2012-08-03 08:40:51 +0000 | [diff] [blame] | 806 | static ssize_t sysfs_show_group(struct device *dev, |
| 807 | struct device_attribute *attr, char *buf); |
| 808 | |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 809 | static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx, |
| 810 | union ib_gid *mgid, int create, |
| 811 | gfp_t gfp_mask) |
| 812 | { |
| 813 | struct mcast_group *group, *cur_group; |
| 814 | int is_mgid0; |
| 815 | int i; |
| 816 | |
| 817 | is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0); |
| 818 | if (!is_mgid0) { |
| 819 | group = mcast_find(ctx, mgid); |
| 820 | if (group) |
| 821 | goto found; |
| 822 | } |
| 823 | |
| 824 | if (!create) |
| 825 | return ERR_PTR(-ENOENT); |
| 826 | |
| 827 | group = kzalloc(sizeof *group, gfp_mask); |
| 828 | if (!group) |
| 829 | return ERR_PTR(-ENOMEM); |
| 830 | |
| 831 | group->demux = ctx; |
| 832 | group->rec.mgid = *mgid; |
| 833 | INIT_LIST_HEAD(&group->pending_list); |
| 834 | INIT_LIST_HEAD(&group->mgid0_list); |
| 835 | for (i = 0; i < MAX_VFS; ++i) |
| 836 | INIT_LIST_HEAD(&group->func[i].pending); |
| 837 | INIT_WORK(&group->work, mlx4_ib_mcg_work_handler); |
| 838 | INIT_DELAYED_WORK(&group->timeout_work, mlx4_ib_mcg_timeout_handler); |
| 839 | mutex_init(&group->lock); |
| 840 | sprintf(group->name, "%016llx%016llx", |
| 841 | be64_to_cpu(group->rec.mgid.global.subnet_prefix), |
| 842 | be64_to_cpu(group->rec.mgid.global.interface_id)); |
Jack Morgenstein | c1e7e46 | 2012-08-03 08:40:51 +0000 | [diff] [blame] | 843 | sysfs_attr_init(&group->dentry.attr); |
| 844 | group->dentry.show = sysfs_show_group; |
| 845 | group->dentry.store = NULL; |
| 846 | group->dentry.attr.name = group->name; |
| 847 | group->dentry.attr.mode = 0400; |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 848 | group->state = MCAST_IDLE; |
| 849 | |
| 850 | if (is_mgid0) { |
| 851 | list_add(&group->mgid0_list, &ctx->mcg_mgid0_list); |
| 852 | goto found; |
| 853 | } |
| 854 | |
| 855 | cur_group = mcast_insert(ctx, group); |
| 856 | if (cur_group) { |
| 857 | mcg_warn("group just showed up %s - confused\n", cur_group->name); |
| 858 | kfree(group); |
| 859 | return ERR_PTR(-EINVAL); |
| 860 | } |
| 861 | |
Jack Morgenstein | c1e7e46 | 2012-08-03 08:40:51 +0000 | [diff] [blame] | 862 | add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); |
| 863 | |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 864 | found: |
| 865 | atomic_inc(&group->refcount); |
| 866 | return group; |
| 867 | } |
| 868 | |
| 869 | static void queue_req(struct mcast_req *req) |
| 870 | { |
| 871 | struct mcast_group *group = req->group; |
| 872 | |
| 873 | atomic_inc(&group->refcount); /* for the request */ |
| 874 | atomic_inc(&group->refcount); /* for scheduling the work */ |
| 875 | list_add_tail(&req->group_list, &group->pending_list); |
| 876 | list_add_tail(&req->func_list, &group->func[req->func].pending); |
| 877 | /* calls mlx4_ib_mcg_work_handler */ |
| 878 | if (!queue_work(group->demux->mcg_wq, &group->work)) |
| 879 | safe_atomic_dec(&group->refcount); |
| 880 | } |
| 881 | |
| 882 | int mlx4_ib_mcg_demux_handler(struct ib_device *ibdev, int port, int slave, |
| 883 | struct ib_sa_mad *mad) |
| 884 | { |
| 885 | struct mlx4_ib_dev *dev = to_mdev(ibdev); |
| 886 | struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)mad->data; |
| 887 | struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1]; |
| 888 | struct mcast_group *group; |
| 889 | |
| 890 | switch (mad->mad_hdr.method) { |
| 891 | case IB_MGMT_METHOD_GET_RESP: |
| 892 | case IB_SA_METHOD_DELETE_RESP: |
| 893 | mutex_lock(&ctx->mcg_table_lock); |
| 894 | group = acquire_group(ctx, &rec->mgid, 0, GFP_KERNEL); |
| 895 | mutex_unlock(&ctx->mcg_table_lock); |
| 896 | if (IS_ERR(group)) { |
| 897 | if (mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP) { |
| 898 | __be64 tid = mad->mad_hdr.tid; |
| 899 | *(u8 *)(&tid) = (u8)slave; /* in group we kept the modified TID */ |
| 900 | group = search_relocate_mgid0_group(ctx, tid, &rec->mgid); |
| 901 | } else |
| 902 | group = NULL; |
| 903 | } |
| 904 | |
| 905 | if (!group) |
| 906 | return 1; |
| 907 | |
| 908 | mutex_lock(&group->lock); |
| 909 | group->response_sa_mad = *mad; |
| 910 | group->prev_state = group->state; |
| 911 | group->state = MCAST_RESP_READY; |
| 912 | /* calls mlx4_ib_mcg_work_handler */ |
| 913 | atomic_inc(&group->refcount); |
| 914 | if (!queue_work(ctx->mcg_wq, &group->work)) |
| 915 | safe_atomic_dec(&group->refcount); |
| 916 | mutex_unlock(&group->lock); |
| 917 | release_group(group, 0); |
| 918 | return 1; /* consumed */ |
| 919 | case IB_MGMT_METHOD_SET: |
| 920 | case IB_SA_METHOD_GET_TABLE: |
| 921 | case IB_SA_METHOD_GET_TABLE_RESP: |
| 922 | case IB_SA_METHOD_DELETE: |
| 923 | return 0; /* not consumed, pass-through to guest over tunnel */ |
| 924 | default: |
| 925 | mcg_warn("In demux, port %d: unexpected MCMember method: 0x%x, dropping\n", |
| 926 | port, mad->mad_hdr.method); |
| 927 | return 1; /* consumed */ |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port, |
| 932 | int slave, struct ib_sa_mad *sa_mad) |
| 933 | { |
| 934 | struct mlx4_ib_dev *dev = to_mdev(ibdev); |
| 935 | struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)sa_mad->data; |
| 936 | struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1]; |
| 937 | struct mcast_group *group; |
| 938 | struct mcast_req *req; |
| 939 | int may_create = 0; |
| 940 | |
| 941 | if (ctx->flushing) |
| 942 | return -EAGAIN; |
| 943 | |
| 944 | switch (sa_mad->mad_hdr.method) { |
| 945 | case IB_MGMT_METHOD_SET: |
| 946 | may_create = 1; |
| 947 | case IB_SA_METHOD_DELETE: |
| 948 | req = kzalloc(sizeof *req, GFP_KERNEL); |
| 949 | if (!req) |
| 950 | return -ENOMEM; |
| 951 | |
| 952 | req->func = slave; |
| 953 | req->sa_mad = *sa_mad; |
| 954 | |
| 955 | mutex_lock(&ctx->mcg_table_lock); |
| 956 | group = acquire_group(ctx, &rec->mgid, may_create, GFP_KERNEL); |
| 957 | mutex_unlock(&ctx->mcg_table_lock); |
| 958 | if (IS_ERR(group)) { |
| 959 | kfree(req); |
| 960 | return PTR_ERR(group); |
| 961 | } |
| 962 | mutex_lock(&group->lock); |
| 963 | if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) { |
| 964 | mutex_unlock(&group->lock); |
| 965 | mcg_warn_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n", |
| 966 | port, slave, MAX_PEND_REQS_PER_FUNC); |
| 967 | release_group(group, 0); |
| 968 | kfree(req); |
| 969 | return -ENOMEM; |
| 970 | } |
| 971 | ++group->func[slave].num_pend_reqs; |
| 972 | req->group = group; |
| 973 | queue_req(req); |
| 974 | mutex_unlock(&group->lock); |
| 975 | release_group(group, 0); |
| 976 | return 1; /* consumed */ |
| 977 | case IB_SA_METHOD_GET_TABLE: |
| 978 | case IB_MGMT_METHOD_GET_RESP: |
| 979 | case IB_SA_METHOD_GET_TABLE_RESP: |
| 980 | case IB_SA_METHOD_DELETE_RESP: |
| 981 | return 0; /* not consumed, pass-through */ |
| 982 | default: |
| 983 | mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n", |
| 984 | port, slave, sa_mad->mad_hdr.method); |
| 985 | return 1; /* consumed */ |
| 986 | } |
| 987 | } |
| 988 | |
Jack Morgenstein | c1e7e46 | 2012-08-03 08:40:51 +0000 | [diff] [blame] | 989 | static ssize_t sysfs_show_group(struct device *dev, |
| 990 | struct device_attribute *attr, char *buf) |
| 991 | { |
| 992 | struct mcast_group *group = |
| 993 | container_of(attr, struct mcast_group, dentry); |
| 994 | struct mcast_req *req = NULL; |
| 995 | char pending_str[40]; |
| 996 | char state_str[40]; |
| 997 | ssize_t len = 0; |
| 998 | int f; |
| 999 | |
| 1000 | if (group->state == MCAST_IDLE) |
| 1001 | sprintf(state_str, "%s", get_state_string(group->state)); |
| 1002 | else |
| 1003 | sprintf(state_str, "%s(TID=0x%llx)", |
| 1004 | get_state_string(group->state), |
| 1005 | be64_to_cpu(group->last_req_tid)); |
| 1006 | if (list_empty(&group->pending_list)) { |
| 1007 | sprintf(pending_str, "No"); |
| 1008 | } else { |
| 1009 | req = list_first_entry(&group->pending_list, struct mcast_req, group_list); |
| 1010 | sprintf(pending_str, "Yes(TID=0x%llx)", |
| 1011 | be64_to_cpu(req->sa_mad.mad_hdr.tid)); |
| 1012 | } |
| 1013 | len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s ", |
| 1014 | group->rec.scope_join_state & 0xf, |
| 1015 | group->members[2], group->members[1], group->members[0], |
| 1016 | atomic_read(&group->refcount), |
| 1017 | pending_str, |
| 1018 | state_str); |
| 1019 | for (f = 0; f < MAX_VFS; ++f) |
| 1020 | if (group->func[f].state == MCAST_MEMBER) |
| 1021 | len += sprintf(buf + len, "%d[%1x] ", |
| 1022 | f, group->func[f].join_state); |
| 1023 | |
| 1024 | len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x " |
| 1025 | "%4x %4x %2x %2x)\n", |
| 1026 | be16_to_cpu(group->rec.pkey), |
| 1027 | be32_to_cpu(group->rec.qkey), |
| 1028 | (group->rec.mtusel_mtu & 0xc0) >> 6, |
| 1029 | group->rec.mtusel_mtu & 0x3f, |
| 1030 | group->rec.tclass, |
| 1031 | (group->rec.ratesel_rate & 0xc0) >> 6, |
| 1032 | group->rec.ratesel_rate & 0x3f, |
| 1033 | (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28, |
| 1034 | (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8, |
| 1035 | be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff, |
| 1036 | group->rec.proxy_join); |
| 1037 | |
| 1038 | return len; |
| 1039 | } |
| 1040 | |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1041 | int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx) |
| 1042 | { |
| 1043 | char name[20]; |
| 1044 | |
| 1045 | atomic_set(&ctx->tid, 0); |
| 1046 | sprintf(name, "mlx4_ib_mcg%d", ctx->port); |
| 1047 | ctx->mcg_wq = create_singlethread_workqueue(name); |
| 1048 | if (!ctx->mcg_wq) |
| 1049 | return -ENOMEM; |
| 1050 | |
| 1051 | mutex_init(&ctx->mcg_table_lock); |
| 1052 | ctx->mcg_table = RB_ROOT; |
| 1053 | INIT_LIST_HEAD(&ctx->mcg_mgid0_list); |
| 1054 | ctx->flushing = 0; |
| 1055 | |
| 1056 | return 0; |
| 1057 | } |
| 1058 | |
| 1059 | static void force_clean_group(struct mcast_group *group) |
| 1060 | { |
| 1061 | struct mcast_req *req, *tmp |
| 1062 | ; |
| 1063 | list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) { |
| 1064 | list_del(&req->group_list); |
| 1065 | kfree(req); |
| 1066 | } |
Jack Morgenstein | c1e7e46 | 2012-08-03 08:40:51 +0000 | [diff] [blame] | 1067 | del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr); |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1068 | rb_erase(&group->node, &group->demux->mcg_table); |
| 1069 | kfree(group); |
| 1070 | } |
| 1071 | |
| 1072 | static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) |
| 1073 | { |
| 1074 | int i; |
| 1075 | struct rb_node *p; |
| 1076 | struct mcast_group *group; |
| 1077 | unsigned long end; |
| 1078 | int count; |
| 1079 | |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1080 | for (i = 0; i < MAX_VFS; ++i) |
| 1081 | clean_vf_mcast(ctx, i); |
| 1082 | |
| 1083 | end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000); |
| 1084 | do { |
| 1085 | count = 0; |
| 1086 | mutex_lock(&ctx->mcg_table_lock); |
| 1087 | for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) |
| 1088 | ++count; |
| 1089 | mutex_unlock(&ctx->mcg_table_lock); |
| 1090 | if (!count) |
| 1091 | break; |
| 1092 | |
| 1093 | msleep(1); |
| 1094 | } while (time_after(end, jiffies)); |
| 1095 | |
| 1096 | flush_workqueue(ctx->mcg_wq); |
| 1097 | if (destroy_wq) |
| 1098 | destroy_workqueue(ctx->mcg_wq); |
| 1099 | |
| 1100 | mutex_lock(&ctx->mcg_table_lock); |
| 1101 | while ((p = rb_first(&ctx->mcg_table)) != NULL) { |
| 1102 | group = rb_entry(p, struct mcast_group, node); |
| 1103 | if (atomic_read(&group->refcount)) |
| 1104 | mcg_warn_group(group, "group refcount %d!!! (pointer %p)\n", atomic_read(&group->refcount), group); |
| 1105 | |
| 1106 | force_clean_group(group); |
| 1107 | } |
| 1108 | mutex_unlock(&ctx->mcg_table_lock); |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1109 | } |
| 1110 | |
| 1111 | struct clean_work { |
| 1112 | struct work_struct work; |
| 1113 | struct mlx4_ib_demux_ctx *ctx; |
| 1114 | int destroy_wq; |
| 1115 | }; |
| 1116 | |
| 1117 | static void mcg_clean_task(struct work_struct *work) |
| 1118 | { |
| 1119 | struct clean_work *cw = container_of(work, struct clean_work, work); |
| 1120 | |
| 1121 | _mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq); |
Eli Cohen | bef83ed | 2012-10-17 16:42:59 +0000 | [diff] [blame] | 1122 | cw->ctx->flushing = 0; |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1123 | kfree(cw); |
| 1124 | } |
| 1125 | |
| 1126 | void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) |
| 1127 | { |
| 1128 | struct clean_work *work; |
| 1129 | |
Eli Cohen | bef83ed | 2012-10-17 16:42:59 +0000 | [diff] [blame] | 1130 | if (ctx->flushing) |
| 1131 | return; |
| 1132 | |
| 1133 | ctx->flushing = 1; |
| 1134 | |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1135 | if (destroy_wq) { |
| 1136 | _mlx4_ib_mcg_port_cleanup(ctx, destroy_wq); |
Eli Cohen | bef83ed | 2012-10-17 16:42:59 +0000 | [diff] [blame] | 1137 | ctx->flushing = 0; |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1138 | return; |
| 1139 | } |
| 1140 | |
| 1141 | work = kmalloc(sizeof *work, GFP_KERNEL); |
| 1142 | if (!work) { |
Eli Cohen | bef83ed | 2012-10-17 16:42:59 +0000 | [diff] [blame] | 1143 | ctx->flushing = 0; |
Oren Duer | b9c5d6a | 2012-08-03 08:40:46 +0000 | [diff] [blame] | 1144 | mcg_warn("failed allocating work for cleanup\n"); |
| 1145 | return; |
| 1146 | } |
| 1147 | |
| 1148 | work->ctx = ctx; |
| 1149 | work->destroy_wq = destroy_wq; |
| 1150 | INIT_WORK(&work->work, mcg_clean_task); |
| 1151 | queue_work(clean_wq, &work->work); |
| 1152 | } |
| 1153 | |
| 1154 | static void build_leave_mad(struct mcast_req *req) |
| 1155 | { |
| 1156 | struct ib_sa_mad *mad = &req->sa_mad; |
| 1157 | |
| 1158 | mad->mad_hdr.method = IB_SA_METHOD_DELETE; |
| 1159 | } |
| 1160 | |
| 1161 | |
| 1162 | static void clear_pending_reqs(struct mcast_group *group, int vf) |
| 1163 | { |
| 1164 | struct mcast_req *req, *tmp, *group_first = NULL; |
| 1165 | int clear; |
| 1166 | int pend = 0; |
| 1167 | |
| 1168 | if (!list_empty(&group->pending_list)) |
| 1169 | group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list); |
| 1170 | |
| 1171 | list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) { |
| 1172 | clear = 1; |
| 1173 | if (group_first == req && |
| 1174 | (group->state == MCAST_JOIN_SENT || |
| 1175 | group->state == MCAST_LEAVE_SENT)) { |
| 1176 | clear = cancel_delayed_work(&group->timeout_work); |
| 1177 | pend = !clear; |
| 1178 | group->state = MCAST_IDLE; |
| 1179 | } |
| 1180 | if (clear) { |
| 1181 | --group->func[vf].num_pend_reqs; |
| 1182 | list_del(&req->group_list); |
| 1183 | list_del(&req->func_list); |
| 1184 | kfree(req); |
| 1185 | atomic_dec(&group->refcount); |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) { |
| 1190 | mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n", |
| 1191 | list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs); |
| 1192 | } |
| 1193 | } |
| 1194 | |
| 1195 | static int push_deleteing_req(struct mcast_group *group, int slave) |
| 1196 | { |
| 1197 | struct mcast_req *req; |
| 1198 | struct mcast_req *pend_req; |
| 1199 | |
| 1200 | if (!group->func[slave].join_state) |
| 1201 | return 0; |
| 1202 | |
| 1203 | req = kzalloc(sizeof *req, GFP_KERNEL); |
| 1204 | if (!req) { |
| 1205 | mcg_warn_group(group, "failed allocation - may leave stall groups\n"); |
| 1206 | return -ENOMEM; |
| 1207 | } |
| 1208 | |
| 1209 | if (!list_empty(&group->func[slave].pending)) { |
| 1210 | pend_req = list_entry(group->func[slave].pending.prev, struct mcast_req, group_list); |
| 1211 | if (pend_req->clean) { |
| 1212 | kfree(req); |
| 1213 | return 0; |
| 1214 | } |
| 1215 | } |
| 1216 | |
| 1217 | req->clean = 1; |
| 1218 | req->func = slave; |
| 1219 | req->group = group; |
| 1220 | ++group->func[slave].num_pend_reqs; |
| 1221 | build_leave_mad(req); |
| 1222 | queue_req(req); |
| 1223 | return 0; |
| 1224 | } |
| 1225 | |
| 1226 | void clean_vf_mcast(struct mlx4_ib_demux_ctx *ctx, int slave) |
| 1227 | { |
| 1228 | struct mcast_group *group; |
| 1229 | struct rb_node *p; |
| 1230 | |
| 1231 | mutex_lock(&ctx->mcg_table_lock); |
| 1232 | for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) { |
| 1233 | group = rb_entry(p, struct mcast_group, node); |
| 1234 | mutex_lock(&group->lock); |
| 1235 | if (atomic_read(&group->refcount)) { |
| 1236 | /* clear pending requests of this VF */ |
| 1237 | clear_pending_reqs(group, slave); |
| 1238 | push_deleteing_req(group, slave); |
| 1239 | } |
| 1240 | mutex_unlock(&group->lock); |
| 1241 | } |
| 1242 | mutex_unlock(&ctx->mcg_table_lock); |
| 1243 | } |
| 1244 | |
| 1245 | |
| 1246 | int mlx4_ib_mcg_init(void) |
| 1247 | { |
| 1248 | clean_wq = create_singlethread_workqueue("mlx4_ib_mcg"); |
| 1249 | if (!clean_wq) |
| 1250 | return -ENOMEM; |
| 1251 | |
| 1252 | return 0; |
| 1253 | } |
| 1254 | |
| 1255 | void mlx4_ib_mcg_destroy(void) |
| 1256 | { |
| 1257 | destroy_workqueue(clean_wq); |
| 1258 | } |