Rahul Lakkireddy | d893184 | 2016-09-20 17:13:09 +0530 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the Chelsio T4 Ethernet driver for Linux. |
| 3 | * |
| 4 | * Copyright (c) 2016 Chelsio Communications, 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 | |
Rahul Lakkireddy | b20ff72 | 2016-09-20 17:13:10 +0530 | [diff] [blame] | 35 | #include <net/tc_act/tc_gact.h> |
| 36 | #include <net/tc_act/tc_mirred.h> |
| 37 | |
Rahul Lakkireddy | d893184 | 2016-09-20 17:13:09 +0530 | [diff] [blame] | 38 | #include "cxgb4.h" |
| 39 | #include "cxgb4_tc_u32_parse.h" |
| 40 | #include "cxgb4_tc_u32.h" |
| 41 | |
| 42 | /* Fill ch_filter_specification with parsed match value/mask pair. */ |
| 43 | static int fill_match_fields(struct adapter *adap, |
| 44 | struct ch_filter_specification *fs, |
| 45 | struct tc_cls_u32_offload *cls, |
| 46 | const struct cxgb4_match_field *entry, |
| 47 | bool next_header) |
| 48 | { |
| 49 | unsigned int i, j; |
| 50 | u32 val, mask; |
| 51 | int off, err; |
| 52 | bool found; |
| 53 | |
| 54 | for (i = 0; i < cls->knode.sel->nkeys; i++) { |
| 55 | off = cls->knode.sel->keys[i].off; |
| 56 | val = cls->knode.sel->keys[i].val; |
| 57 | mask = cls->knode.sel->keys[i].mask; |
| 58 | |
| 59 | if (next_header) { |
| 60 | /* For next headers, parse only keys with offmask */ |
| 61 | if (!cls->knode.sel->keys[i].offmask) |
| 62 | continue; |
| 63 | } else { |
| 64 | /* For the remaining, parse only keys without offmask */ |
| 65 | if (cls->knode.sel->keys[i].offmask) |
| 66 | continue; |
| 67 | } |
| 68 | |
| 69 | found = false; |
| 70 | |
| 71 | for (j = 0; entry[j].val; j++) { |
| 72 | if (off == entry[j].off) { |
| 73 | found = true; |
| 74 | err = entry[j].val(fs, val, mask); |
| 75 | if (err) |
| 76 | return err; |
| 77 | break; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | if (!found) |
| 82 | return -EINVAL; |
| 83 | } |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
Rahul Lakkireddy | b20ff72 | 2016-09-20 17:13:10 +0530 | [diff] [blame] | 88 | /* Fill ch_filter_specification with parsed action. */ |
| 89 | static int fill_action_fields(struct adapter *adap, |
| 90 | struct ch_filter_specification *fs, |
| 91 | struct tc_cls_u32_offload *cls) |
| 92 | { |
| 93 | unsigned int num_actions = 0; |
| 94 | const struct tc_action *a; |
| 95 | struct tcf_exts *exts; |
| 96 | LIST_HEAD(actions); |
| 97 | |
| 98 | exts = cls->knode.exts; |
| 99 | if (tc_no_actions(exts)) |
| 100 | return -EINVAL; |
| 101 | |
| 102 | tcf_exts_to_list(exts, &actions); |
| 103 | list_for_each_entry(a, &actions, list) { |
| 104 | /* Don't allow more than one action per rule. */ |
| 105 | if (num_actions) |
| 106 | return -EINVAL; |
| 107 | |
| 108 | /* Drop in hardware. */ |
| 109 | if (is_tcf_gact_shot(a)) { |
| 110 | fs->action = FILTER_DROP; |
| 111 | num_actions++; |
| 112 | continue; |
| 113 | } |
| 114 | |
| 115 | /* Re-direct to specified port in hardware. */ |
| 116 | if (is_tcf_mirred_redirect(a)) { |
| 117 | struct net_device *n_dev; |
| 118 | unsigned int i, index; |
| 119 | bool found = false; |
| 120 | |
| 121 | index = tcf_mirred_ifindex(a); |
| 122 | for_each_port(adap, i) { |
| 123 | n_dev = adap->port[i]; |
| 124 | if (index == n_dev->ifindex) { |
| 125 | fs->action = FILTER_SWITCH; |
| 126 | fs->eport = i; |
| 127 | found = true; |
| 128 | break; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | /* Interface doesn't belong to any port of |
| 133 | * the underlying hardware. |
| 134 | */ |
| 135 | if (!found) |
| 136 | return -EINVAL; |
| 137 | |
| 138 | num_actions++; |
| 139 | continue; |
| 140 | } |
| 141 | |
| 142 | /* Un-supported action. */ |
| 143 | return -EINVAL; |
| 144 | } |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
Rahul Lakkireddy | d893184 | 2016-09-20 17:13:09 +0530 | [diff] [blame] | 149 | int cxgb4_config_knode(struct net_device *dev, __be16 protocol, |
| 150 | struct tc_cls_u32_offload *cls) |
| 151 | { |
| 152 | const struct cxgb4_match_field *start, *link_start = NULL; |
| 153 | struct adapter *adapter = netdev2adap(dev); |
| 154 | struct ch_filter_specification fs; |
| 155 | struct cxgb4_tc_u32_table *t; |
| 156 | struct cxgb4_link *link; |
| 157 | unsigned int filter_id; |
| 158 | u32 uhtid, link_uhtid; |
| 159 | bool is_ipv6 = false; |
| 160 | int ret; |
| 161 | |
| 162 | if (!can_tc_u32_offload(dev)) |
| 163 | return -EOPNOTSUPP; |
| 164 | |
| 165 | if (protocol != htons(ETH_P_IP) && protocol != htons(ETH_P_IPV6)) |
| 166 | return -EOPNOTSUPP; |
| 167 | |
| 168 | /* Fetch the location to insert the filter. */ |
| 169 | filter_id = cls->knode.handle & 0xFFFFF; |
| 170 | |
| 171 | if (filter_id > adapter->tids.nftids) { |
| 172 | dev_err(adapter->pdev_dev, |
| 173 | "Location %d out of range for insertion. Max: %d\n", |
| 174 | filter_id, adapter->tids.nftids); |
| 175 | return -ERANGE; |
| 176 | } |
| 177 | |
| 178 | t = adapter->tc_u32; |
| 179 | uhtid = TC_U32_USERHTID(cls->knode.handle); |
| 180 | link_uhtid = TC_U32_USERHTID(cls->knode.link_handle); |
| 181 | |
| 182 | /* Ensure that uhtid is either root u32 (i.e. 0x800) |
| 183 | * or a a valid linked bucket. |
| 184 | */ |
| 185 | if (uhtid != 0x800 && uhtid >= t->size) |
| 186 | return -EINVAL; |
| 187 | |
| 188 | /* Ensure link handle uhtid is sane, if specified. */ |
| 189 | if (link_uhtid >= t->size) |
| 190 | return -EINVAL; |
| 191 | |
| 192 | memset(&fs, 0, sizeof(fs)); |
| 193 | |
| 194 | if (protocol == htons(ETH_P_IPV6)) { |
| 195 | start = cxgb4_ipv6_fields; |
| 196 | is_ipv6 = true; |
| 197 | } else { |
| 198 | start = cxgb4_ipv4_fields; |
| 199 | is_ipv6 = false; |
| 200 | } |
| 201 | |
| 202 | if (uhtid != 0x800) { |
| 203 | /* Link must exist from root node before insertion. */ |
| 204 | if (!t->table[uhtid - 1].link_handle) |
| 205 | return -EINVAL; |
| 206 | |
| 207 | /* Link must have a valid supported next header. */ |
| 208 | link_start = t->table[uhtid - 1].match_field; |
| 209 | if (!link_start) |
| 210 | return -EINVAL; |
| 211 | } |
| 212 | |
| 213 | /* Parse links and record them for subsequent jumps to valid |
| 214 | * next headers. |
| 215 | */ |
| 216 | if (link_uhtid) { |
| 217 | const struct cxgb4_next_header *next; |
| 218 | bool found = false; |
| 219 | unsigned int i, j; |
| 220 | u32 val, mask; |
| 221 | int off; |
| 222 | |
| 223 | if (t->table[link_uhtid - 1].link_handle) { |
| 224 | dev_err(adapter->pdev_dev, |
| 225 | "Link handle exists for: 0x%x\n", |
| 226 | link_uhtid); |
| 227 | return -EINVAL; |
| 228 | } |
| 229 | |
| 230 | next = is_ipv6 ? cxgb4_ipv6_jumps : cxgb4_ipv4_jumps; |
| 231 | |
| 232 | /* Try to find matches that allow jumps to next header. */ |
| 233 | for (i = 0; next[i].jump; i++) { |
| 234 | if (next[i].offoff != cls->knode.sel->offoff || |
| 235 | next[i].shift != cls->knode.sel->offshift || |
| 236 | next[i].mask != cls->knode.sel->offmask || |
| 237 | next[i].offset != cls->knode.sel->off) |
| 238 | continue; |
| 239 | |
| 240 | /* Found a possible candidate. Find a key that |
| 241 | * matches the corresponding offset, value, and |
| 242 | * mask to jump to next header. |
| 243 | */ |
| 244 | for (j = 0; j < cls->knode.sel->nkeys; j++) { |
| 245 | off = cls->knode.sel->keys[j].off; |
| 246 | val = cls->knode.sel->keys[j].val; |
| 247 | mask = cls->knode.sel->keys[j].mask; |
| 248 | |
| 249 | if (next[i].match_off == off && |
| 250 | next[i].match_val == val && |
| 251 | next[i].match_mask == mask) { |
| 252 | found = true; |
| 253 | break; |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | if (!found) |
| 258 | continue; /* Try next candidate. */ |
| 259 | |
| 260 | /* Candidate to jump to next header found. |
| 261 | * Translate all keys to internal specification |
| 262 | * and store them in jump table. This spec is copied |
| 263 | * later to set the actual filters. |
| 264 | */ |
| 265 | ret = fill_match_fields(adapter, &fs, cls, |
| 266 | start, false); |
| 267 | if (ret) |
| 268 | goto out; |
| 269 | |
| 270 | link = &t->table[link_uhtid - 1]; |
| 271 | link->match_field = next[i].jump; |
| 272 | link->link_handle = cls->knode.handle; |
| 273 | memcpy(&link->fs, &fs, sizeof(fs)); |
| 274 | break; |
| 275 | } |
| 276 | |
| 277 | /* No candidate found to jump to next header. */ |
| 278 | if (!found) |
| 279 | return -EINVAL; |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | /* Fill ch_filter_specification match fields to be shipped to hardware. |
| 285 | * Copy the linked spec (if any) first. And then update the spec as |
| 286 | * needed. |
| 287 | */ |
| 288 | if (uhtid != 0x800 && t->table[uhtid - 1].link_handle) { |
| 289 | /* Copy linked ch_filter_specification */ |
| 290 | memcpy(&fs, &t->table[uhtid - 1].fs, sizeof(fs)); |
| 291 | ret = fill_match_fields(adapter, &fs, cls, |
| 292 | link_start, true); |
| 293 | if (ret) |
| 294 | goto out; |
| 295 | } |
| 296 | |
| 297 | ret = fill_match_fields(adapter, &fs, cls, start, false); |
| 298 | if (ret) |
| 299 | goto out; |
| 300 | |
Rahul Lakkireddy | b20ff72 | 2016-09-20 17:13:10 +0530 | [diff] [blame] | 301 | /* Fill ch_filter_specification action fields to be shipped to |
| 302 | * hardware. |
| 303 | */ |
| 304 | ret = fill_action_fields(adapter, &fs, cls); |
| 305 | if (ret) |
| 306 | goto out; |
| 307 | |
Rahul Lakkireddy | d893184 | 2016-09-20 17:13:09 +0530 | [diff] [blame] | 308 | /* The filter spec has been completely built from the info |
| 309 | * provided from u32. We now set some default fields in the |
| 310 | * spec for sanity. |
| 311 | */ |
| 312 | |
| 313 | /* Match only packets coming from the ingress port where this |
| 314 | * filter will be created. |
| 315 | */ |
| 316 | fs.val.iport = netdev2pinfo(dev)->port_id; |
| 317 | fs.mask.iport = ~0; |
| 318 | |
| 319 | /* Enable filter hit counts. */ |
| 320 | fs.hitcnts = 1; |
| 321 | |
| 322 | /* Set type of filter - IPv6 or IPv4 */ |
| 323 | fs.type = is_ipv6 ? 1 : 0; |
| 324 | |
| 325 | /* Set the filter */ |
| 326 | ret = cxgb4_set_filter(dev, filter_id, &fs); |
| 327 | if (ret) |
| 328 | goto out; |
| 329 | |
| 330 | /* If this is a linked bucket, then set the corresponding |
| 331 | * entry in the bitmap to mark it as belonging to this linked |
| 332 | * bucket. |
| 333 | */ |
| 334 | if (uhtid != 0x800 && t->table[uhtid - 1].link_handle) |
| 335 | set_bit(filter_id, t->table[uhtid - 1].tid_map); |
| 336 | |
| 337 | out: |
| 338 | return ret; |
| 339 | } |
| 340 | |
| 341 | int cxgb4_delete_knode(struct net_device *dev, __be16 protocol, |
| 342 | struct tc_cls_u32_offload *cls) |
| 343 | { |
| 344 | struct adapter *adapter = netdev2adap(dev); |
| 345 | unsigned int filter_id, max_tids, i, j; |
| 346 | struct cxgb4_link *link = NULL; |
| 347 | struct cxgb4_tc_u32_table *t; |
| 348 | u32 handle, uhtid; |
| 349 | int ret; |
| 350 | |
| 351 | if (!can_tc_u32_offload(dev)) |
| 352 | return -EOPNOTSUPP; |
| 353 | |
| 354 | /* Fetch the location to delete the filter. */ |
| 355 | filter_id = cls->knode.handle & 0xFFFFF; |
| 356 | |
| 357 | if (filter_id > adapter->tids.nftids) { |
| 358 | dev_err(adapter->pdev_dev, |
| 359 | "Location %d out of range for deletion. Max: %d\n", |
| 360 | filter_id, adapter->tids.nftids); |
| 361 | return -ERANGE; |
| 362 | } |
| 363 | |
| 364 | t = adapter->tc_u32; |
| 365 | handle = cls->knode.handle; |
| 366 | uhtid = TC_U32_USERHTID(cls->knode.handle); |
| 367 | |
| 368 | /* Ensure that uhtid is either root u32 (i.e. 0x800) |
| 369 | * or a a valid linked bucket. |
| 370 | */ |
| 371 | if (uhtid != 0x800 && uhtid >= t->size) |
| 372 | return -EINVAL; |
| 373 | |
| 374 | /* Delete the specified filter */ |
| 375 | if (uhtid != 0x800) { |
| 376 | link = &t->table[uhtid - 1]; |
| 377 | if (!link->link_handle) |
| 378 | return -EINVAL; |
| 379 | |
| 380 | if (!test_bit(filter_id, link->tid_map)) |
| 381 | return -EINVAL; |
| 382 | } |
| 383 | |
| 384 | ret = cxgb4_del_filter(dev, filter_id); |
| 385 | if (ret) |
| 386 | goto out; |
| 387 | |
| 388 | if (link) |
| 389 | clear_bit(filter_id, link->tid_map); |
| 390 | |
| 391 | /* If a link is being deleted, then delete all filters |
| 392 | * associated with the link. |
| 393 | */ |
| 394 | max_tids = adapter->tids.nftids; |
| 395 | for (i = 0; i < t->size; i++) { |
| 396 | link = &t->table[i]; |
| 397 | |
| 398 | if (link->link_handle == handle) { |
| 399 | for (j = 0; j < max_tids; j++) { |
| 400 | if (!test_bit(j, link->tid_map)) |
| 401 | continue; |
| 402 | |
| 403 | ret = __cxgb4_del_filter(dev, j, NULL); |
| 404 | if (ret) |
| 405 | goto out; |
| 406 | |
| 407 | clear_bit(j, link->tid_map); |
| 408 | } |
| 409 | |
| 410 | /* Clear the link state */ |
| 411 | link->match_field = NULL; |
| 412 | link->link_handle = 0; |
| 413 | memset(&link->fs, 0, sizeof(link->fs)); |
| 414 | break; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | out: |
| 419 | return ret; |
| 420 | } |
| 421 | |
| 422 | void cxgb4_cleanup_tc_u32(struct adapter *adap) |
| 423 | { |
| 424 | struct cxgb4_tc_u32_table *t; |
| 425 | unsigned int i; |
| 426 | |
| 427 | if (!adap->tc_u32) |
| 428 | return; |
| 429 | |
| 430 | /* Free up all allocated memory. */ |
| 431 | t = adap->tc_u32; |
| 432 | for (i = 0; i < t->size; i++) { |
| 433 | struct cxgb4_link *link = &t->table[i]; |
| 434 | |
| 435 | t4_free_mem(link->tid_map); |
| 436 | } |
| 437 | t4_free_mem(adap->tc_u32); |
| 438 | } |
| 439 | |
| 440 | struct cxgb4_tc_u32_table *cxgb4_init_tc_u32(struct adapter *adap, |
| 441 | unsigned int size) |
| 442 | { |
| 443 | struct cxgb4_tc_u32_table *t; |
| 444 | unsigned int i; |
| 445 | |
| 446 | if (!size) |
| 447 | return NULL; |
| 448 | |
| 449 | t = t4_alloc_mem(sizeof(*t) + |
| 450 | (size * sizeof(struct cxgb4_link))); |
| 451 | if (!t) |
| 452 | return NULL; |
| 453 | |
| 454 | t->size = size; |
| 455 | |
| 456 | for (i = 0; i < t->size; i++) { |
| 457 | struct cxgb4_link *link = &t->table[i]; |
| 458 | unsigned int bmap_size; |
| 459 | unsigned int max_tids; |
| 460 | |
| 461 | max_tids = adap->tids.nftids; |
| 462 | bmap_size = BITS_TO_LONGS(max_tids); |
| 463 | link->tid_map = t4_alloc_mem(sizeof(unsigned long) * bmap_size); |
| 464 | if (!link->tid_map) |
| 465 | goto out_no_mem; |
| 466 | bitmap_zero(link->tid_map, max_tids); |
| 467 | } |
| 468 | |
| 469 | return t; |
| 470 | |
| 471 | out_no_mem: |
| 472 | for (i = 0; i < t->size; i++) { |
| 473 | struct cxgb4_link *link = &t->table[i]; |
| 474 | |
| 475 | if (link->tid_map) |
| 476 | t4_free_mem(link->tid_map); |
| 477 | } |
| 478 | |
| 479 | if (t) |
| 480 | t4_free_mem(t); |
| 481 | |
| 482 | return NULL; |
| 483 | } |