ocelot_devlink.c (27189B)
1// SPDX-License-Identifier: (GPL-2.0 OR MIT) 2/* Copyright 2020-2021 NXP 3 */ 4#include <net/devlink.h> 5#include "ocelot.h" 6 7/* The queue system tracks four resource consumptions: 8 * Resource 0: Memory tracked per source port 9 * Resource 1: Frame references tracked per source port 10 * Resource 2: Memory tracked per destination port 11 * Resource 3: Frame references tracked per destination port 12 */ 13#define OCELOT_RESOURCE_SZ 256 14#define OCELOT_NUM_RESOURCES 4 15 16#define BUF_xxxx_I (0 * OCELOT_RESOURCE_SZ) 17#define REF_xxxx_I (1 * OCELOT_RESOURCE_SZ) 18#define BUF_xxxx_E (2 * OCELOT_RESOURCE_SZ) 19#define REF_xxxx_E (3 * OCELOT_RESOURCE_SZ) 20 21/* For each resource type there are 4 types of watermarks: 22 * Q_RSRV: reservation per QoS class per port 23 * PRIO_SHR: sharing watermark per QoS class across all ports 24 * P_RSRV: reservation per port 25 * COL_SHR: sharing watermark per color (drop precedence) across all ports 26 */ 27#define xxx_Q_RSRV_x 0 28#define xxx_PRIO_SHR_x 216 29#define xxx_P_RSRV_x 224 30#define xxx_COL_SHR_x 254 31 32/* Reservation Watermarks 33 * ---------------------- 34 * 35 * For setting up the reserved areas, egress watermarks exist per port and per 36 * QoS class for both ingress and egress. 37 */ 38 39/* Amount of packet buffer 40 * | per QoS class 41 * | | reserved 42 * | | | per egress port 43 * | | | | 44 * V V v v 45 * BUF_Q_RSRV_E 46 */ 47#define BUF_Q_RSRV_E(port, prio) \ 48 (BUF_xxxx_E + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio)) 49 50/* Amount of packet buffer 51 * | for all port's traffic classes 52 * | | reserved 53 * | | | per egress port 54 * | | | | 55 * V V v v 56 * BUF_P_RSRV_E 57 */ 58#define BUF_P_RSRV_E(port) \ 59 (BUF_xxxx_E + xxx_P_RSRV_x + (port)) 60 61/* Amount of packet buffer 62 * | per QoS class 63 * | | reserved 64 * | | | per ingress port 65 * | | | | 66 * V V v v 67 * BUF_Q_RSRV_I 68 */ 69#define BUF_Q_RSRV_I(port, prio) \ 70 (BUF_xxxx_I + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio)) 71 72/* Amount of packet buffer 73 * | for all port's traffic classes 74 * | | reserved 75 * | | | per ingress port 76 * | | | | 77 * V V v v 78 * BUF_P_RSRV_I 79 */ 80#define BUF_P_RSRV_I(port) \ 81 (BUF_xxxx_I + xxx_P_RSRV_x + (port)) 82 83/* Amount of frame references 84 * | per QoS class 85 * | | reserved 86 * | | | per egress port 87 * | | | | 88 * V V v v 89 * REF_Q_RSRV_E 90 */ 91#define REF_Q_RSRV_E(port, prio) \ 92 (REF_xxxx_E + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio)) 93 94/* Amount of frame references 95 * | for all port's traffic classes 96 * | | reserved 97 * | | | per egress port 98 * | | | | 99 * V V v v 100 * REF_P_RSRV_E 101 */ 102#define REF_P_RSRV_E(port) \ 103 (REF_xxxx_E + xxx_P_RSRV_x + (port)) 104 105/* Amount of frame references 106 * | per QoS class 107 * | | reserved 108 * | | | per ingress port 109 * | | | | 110 * V V v v 111 * REF_Q_RSRV_I 112 */ 113#define REF_Q_RSRV_I(port, prio) \ 114 (REF_xxxx_I + xxx_Q_RSRV_x + OCELOT_NUM_TC * (port) + (prio)) 115 116/* Amount of frame references 117 * | for all port's traffic classes 118 * | | reserved 119 * | | | per ingress port 120 * | | | | 121 * V V v v 122 * REF_P_RSRV_I 123 */ 124#define REF_P_RSRV_I(port) \ 125 (REF_xxxx_I + xxx_P_RSRV_x + (port)) 126 127/* Sharing Watermarks 128 * ------------------ 129 * 130 * The shared memory area is shared between all ports. 131 */ 132 133/* Amount of buffer 134 * | per QoS class 135 * | | from the shared memory area 136 * | | | for egress traffic 137 * | | | | 138 * V V v v 139 * BUF_PRIO_SHR_E 140 */ 141#define BUF_PRIO_SHR_E(prio) \ 142 (BUF_xxxx_E + xxx_PRIO_SHR_x + (prio)) 143 144/* Amount of buffer 145 * | per color (drop precedence level) 146 * | | from the shared memory area 147 * | | | for egress traffic 148 * | | | | 149 * V V v v 150 * BUF_COL_SHR_E 151 */ 152#define BUF_COL_SHR_E(dp) \ 153 (BUF_xxxx_E + xxx_COL_SHR_x + (1 - (dp))) 154 155/* Amount of buffer 156 * | per QoS class 157 * | | from the shared memory area 158 * | | | for ingress traffic 159 * | | | | 160 * V V v v 161 * BUF_PRIO_SHR_I 162 */ 163#define BUF_PRIO_SHR_I(prio) \ 164 (BUF_xxxx_I + xxx_PRIO_SHR_x + (prio)) 165 166/* Amount of buffer 167 * | per color (drop precedence level) 168 * | | from the shared memory area 169 * | | | for ingress traffic 170 * | | | | 171 * V V v v 172 * BUF_COL_SHR_I 173 */ 174#define BUF_COL_SHR_I(dp) \ 175 (BUF_xxxx_I + xxx_COL_SHR_x + (1 - (dp))) 176 177/* Amount of frame references 178 * | per QoS class 179 * | | from the shared area 180 * | | | for egress traffic 181 * | | | | 182 * V V v v 183 * REF_PRIO_SHR_E 184 */ 185#define REF_PRIO_SHR_E(prio) \ 186 (REF_xxxx_E + xxx_PRIO_SHR_x + (prio)) 187 188/* Amount of frame references 189 * | per color (drop precedence level) 190 * | | from the shared area 191 * | | | for egress traffic 192 * | | | | 193 * V V v v 194 * REF_COL_SHR_E 195 */ 196#define REF_COL_SHR_E(dp) \ 197 (REF_xxxx_E + xxx_COL_SHR_x + (1 - (dp))) 198 199/* Amount of frame references 200 * | per QoS class 201 * | | from the shared area 202 * | | | for ingress traffic 203 * | | | | 204 * V V v v 205 * REF_PRIO_SHR_I 206 */ 207#define REF_PRIO_SHR_I(prio) \ 208 (REF_xxxx_I + xxx_PRIO_SHR_x + (prio)) 209 210/* Amount of frame references 211 * | per color (drop precedence level) 212 * | | from the shared area 213 * | | | for ingress traffic 214 * | | | | 215 * V V v v 216 * REF_COL_SHR_I 217 */ 218#define REF_COL_SHR_I(dp) \ 219 (REF_xxxx_I + xxx_COL_SHR_x + (1 - (dp))) 220 221static u32 ocelot_wm_read(struct ocelot *ocelot, int index) 222{ 223 int wm = ocelot_read_gix(ocelot, QSYS_RES_CFG, index); 224 225 return ocelot->ops->wm_dec(wm); 226} 227 228static void ocelot_wm_write(struct ocelot *ocelot, int index, u32 val) 229{ 230 u32 wm = ocelot->ops->wm_enc(val); 231 232 ocelot_write_gix(ocelot, wm, QSYS_RES_CFG, index); 233} 234 235static void ocelot_wm_status(struct ocelot *ocelot, int index, u32 *inuse, 236 u32 *maxuse) 237{ 238 int res_stat = ocelot_read_gix(ocelot, QSYS_RES_STAT, index); 239 240 return ocelot->ops->wm_stat(res_stat, inuse, maxuse); 241} 242 243/* The hardware comes out of reset with strange defaults: the sum of all 244 * reservations for frame memory is larger than the total buffer size. 245 * One has to wonder how can the reservation watermarks still guarantee 246 * anything under congestion. 247 * Bring some sense into the hardware by changing the defaults to disable all 248 * reservations and rely only on the sharing watermark for frames with drop 249 * precedence 0. The user can still explicitly request reservations per port 250 * and per port-tc through devlink-sb. 251 */ 252static void ocelot_disable_reservation_watermarks(struct ocelot *ocelot, 253 int port) 254{ 255 int prio; 256 257 for (prio = 0; prio < OCELOT_NUM_TC; prio++) { 258 ocelot_wm_write(ocelot, BUF_Q_RSRV_I(port, prio), 0); 259 ocelot_wm_write(ocelot, BUF_Q_RSRV_E(port, prio), 0); 260 ocelot_wm_write(ocelot, REF_Q_RSRV_I(port, prio), 0); 261 ocelot_wm_write(ocelot, REF_Q_RSRV_E(port, prio), 0); 262 } 263 264 ocelot_wm_write(ocelot, BUF_P_RSRV_I(port), 0); 265 ocelot_wm_write(ocelot, BUF_P_RSRV_E(port), 0); 266 ocelot_wm_write(ocelot, REF_P_RSRV_I(port), 0); 267 ocelot_wm_write(ocelot, REF_P_RSRV_E(port), 0); 268} 269 270/* We want the sharing watermarks to consume all nonreserved resources, for 271 * efficient resource utilization (a single traffic flow should be able to use 272 * up the entire buffer space and frame resources as long as there's no 273 * interference). 274 * The switch has 10 sharing watermarks per lookup: 8 per traffic class and 2 275 * per color (drop precedence). 276 * The trouble with configuring these sharing watermarks is that: 277 * (1) There's a risk that we overcommit the resources if we configure 278 * (a) all 8 per-TC sharing watermarks to the max 279 * (b) all 2 per-color sharing watermarks to the max 280 * (2) There's a risk that we undercommit the resources if we configure 281 * (a) all 8 per-TC sharing watermarks to "max / 8" 282 * (b) all 2 per-color sharing watermarks to "max / 2" 283 * So for Linux, let's just disable the sharing watermarks per traffic class 284 * (setting them to 0 will make them always exceeded), and rely only on the 285 * sharing watermark for drop priority 0. So frames with drop priority set to 1 286 * by QoS classification or policing will still be allowed, but only as long as 287 * the port and port-TC reservations are not exceeded. 288 */ 289static void ocelot_disable_tc_sharing_watermarks(struct ocelot *ocelot) 290{ 291 int prio; 292 293 for (prio = 0; prio < OCELOT_NUM_TC; prio++) { 294 ocelot_wm_write(ocelot, BUF_PRIO_SHR_I(prio), 0); 295 ocelot_wm_write(ocelot, BUF_PRIO_SHR_E(prio), 0); 296 ocelot_wm_write(ocelot, REF_PRIO_SHR_I(prio), 0); 297 ocelot_wm_write(ocelot, REF_PRIO_SHR_E(prio), 0); 298 } 299} 300 301static void ocelot_get_buf_rsrv(struct ocelot *ocelot, u32 *buf_rsrv_i, 302 u32 *buf_rsrv_e) 303{ 304 int port, prio; 305 306 *buf_rsrv_i = 0; 307 *buf_rsrv_e = 0; 308 309 for (port = 0; port <= ocelot->num_phys_ports; port++) { 310 for (prio = 0; prio < OCELOT_NUM_TC; prio++) { 311 *buf_rsrv_i += ocelot_wm_read(ocelot, 312 BUF_Q_RSRV_I(port, prio)); 313 *buf_rsrv_e += ocelot_wm_read(ocelot, 314 BUF_Q_RSRV_E(port, prio)); 315 } 316 317 *buf_rsrv_i += ocelot_wm_read(ocelot, BUF_P_RSRV_I(port)); 318 *buf_rsrv_e += ocelot_wm_read(ocelot, BUF_P_RSRV_E(port)); 319 } 320 321 *buf_rsrv_i *= OCELOT_BUFFER_CELL_SZ; 322 *buf_rsrv_e *= OCELOT_BUFFER_CELL_SZ; 323} 324 325static void ocelot_get_ref_rsrv(struct ocelot *ocelot, u32 *ref_rsrv_i, 326 u32 *ref_rsrv_e) 327{ 328 int port, prio; 329 330 *ref_rsrv_i = 0; 331 *ref_rsrv_e = 0; 332 333 for (port = 0; port <= ocelot->num_phys_ports; port++) { 334 for (prio = 0; prio < OCELOT_NUM_TC; prio++) { 335 *ref_rsrv_i += ocelot_wm_read(ocelot, 336 REF_Q_RSRV_I(port, prio)); 337 *ref_rsrv_e += ocelot_wm_read(ocelot, 338 REF_Q_RSRV_E(port, prio)); 339 } 340 341 *ref_rsrv_i += ocelot_wm_read(ocelot, REF_P_RSRV_I(port)); 342 *ref_rsrv_e += ocelot_wm_read(ocelot, REF_P_RSRV_E(port)); 343 } 344} 345 346/* Calculate all reservations, then set up the sharing watermark for DP=0 to 347 * consume the remaining resources up to the pool's configured size. 348 */ 349static void ocelot_setup_sharing_watermarks(struct ocelot *ocelot) 350{ 351 u32 buf_rsrv_i, buf_rsrv_e; 352 u32 ref_rsrv_i, ref_rsrv_e; 353 u32 buf_shr_i, buf_shr_e; 354 u32 ref_shr_i, ref_shr_e; 355 356 ocelot_get_buf_rsrv(ocelot, &buf_rsrv_i, &buf_rsrv_e); 357 ocelot_get_ref_rsrv(ocelot, &ref_rsrv_i, &ref_rsrv_e); 358 359 buf_shr_i = ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING] - 360 buf_rsrv_i; 361 buf_shr_e = ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR] - 362 buf_rsrv_e; 363 ref_shr_i = ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING] - 364 ref_rsrv_i; 365 ref_shr_e = ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR] - 366 ref_rsrv_e; 367 368 buf_shr_i /= OCELOT_BUFFER_CELL_SZ; 369 buf_shr_e /= OCELOT_BUFFER_CELL_SZ; 370 371 ocelot_wm_write(ocelot, BUF_COL_SHR_I(0), buf_shr_i); 372 ocelot_wm_write(ocelot, BUF_COL_SHR_E(0), buf_shr_e); 373 ocelot_wm_write(ocelot, REF_COL_SHR_E(0), ref_shr_e); 374 ocelot_wm_write(ocelot, REF_COL_SHR_I(0), ref_shr_i); 375 ocelot_wm_write(ocelot, BUF_COL_SHR_I(1), 0); 376 ocelot_wm_write(ocelot, BUF_COL_SHR_E(1), 0); 377 ocelot_wm_write(ocelot, REF_COL_SHR_E(1), 0); 378 ocelot_wm_write(ocelot, REF_COL_SHR_I(1), 0); 379} 380 381/* Ensure that all reservations can be enforced */ 382static int ocelot_watermark_validate(struct ocelot *ocelot, 383 struct netlink_ext_ack *extack) 384{ 385 u32 buf_rsrv_i, buf_rsrv_e; 386 u32 ref_rsrv_i, ref_rsrv_e; 387 388 ocelot_get_buf_rsrv(ocelot, &buf_rsrv_i, &buf_rsrv_e); 389 ocelot_get_ref_rsrv(ocelot, &ref_rsrv_i, &ref_rsrv_e); 390 391 if (buf_rsrv_i > ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING]) { 392 NL_SET_ERR_MSG_MOD(extack, 393 "Ingress frame reservations exceed pool size"); 394 return -ERANGE; 395 } 396 if (buf_rsrv_e > ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR]) { 397 NL_SET_ERR_MSG_MOD(extack, 398 "Egress frame reservations exceed pool size"); 399 return -ERANGE; 400 } 401 if (ref_rsrv_i > ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING]) { 402 NL_SET_ERR_MSG_MOD(extack, 403 "Ingress reference reservations exceed pool size"); 404 return -ERANGE; 405 } 406 if (ref_rsrv_e > ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR]) { 407 NL_SET_ERR_MSG_MOD(extack, 408 "Egress reference reservations exceed pool size"); 409 return -ERANGE; 410 } 411 412 return 0; 413} 414 415/* The hardware works like this: 416 * 417 * Frame forwarding decision taken 418 * | 419 * v 420 * +--------------------+--------------------+--------------------+ 421 * | | | | 422 * v v v v 423 * Ingress memory Egress memory Ingress frame Egress frame 424 * check check reference check reference check 425 * | | | | 426 * v v v v 427 * BUF_Q_RSRV_I ok BUF_Q_RSRV_E ok REF_Q_RSRV_I ok REF_Q_RSRV_E ok 428 *(src port, prio) -+ (dst port, prio) -+ (src port, prio) -+ (dst port, prio) -+ 429 * | | | | | | | | 430 * |exceeded | |exceeded | |exceeded | |exceeded | 431 * v | v | v | v | 432 * BUF_P_RSRV_I ok| BUF_P_RSRV_E ok| REF_P_RSRV_I ok| REF_P_RSRV_E ok| 433 * (src port) ----+ (dst port) ----+ (src port) ----+ (dst port) -----+ 434 * | | | | | | | | 435 * |exceeded | |exceeded | |exceeded | |exceeded | 436 * v | v | v | v | 437 * BUF_PRIO_SHR_I ok| BUF_PRIO_SHR_E ok| REF_PRIO_SHR_I ok| REF_PRIO_SHR_E ok| 438 * (prio) ------+ (prio) ------+ (prio) ------+ (prio) -------+ 439 * | | | | | | | | 440 * |exceeded | |exceeded | |exceeded | |exceeded | 441 * v | v | v | v | 442 * BUF_COL_SHR_I ok| BUF_COL_SHR_E ok| REF_COL_SHR_I ok| REF_COL_SHR_E ok| 443 * (dp) -------+ (dp) -------+ (dp) -------+ (dp) --------+ 444 * | | | | | | | | 445 * |exceeded | |exceeded | |exceeded | |exceeded | 446 * v v v v v v v v 447 * fail success fail success fail success fail success 448 * | | | | | | | | 449 * v v v v v v v v 450 * +-----+----+ +-----+----+ +-----+----+ +-----+-----+ 451 * | | | | 452 * +-------> OR <-------+ +-------> OR <-------+ 453 * | | 454 * v v 455 * +----------------> AND <-----------------+ 456 * | 457 * v 458 * FIFO drop / accept 459 * 460 * We are modeling each of the 4 parallel lookups as a devlink-sb pool. 461 * At least one (ingress or egress) memory pool and one (ingress or egress) 462 * frame reference pool need to have resources for frame acceptance to succeed. 463 * 464 * The following watermarks are controlled explicitly through devlink-sb: 465 * BUF_Q_RSRV_I, BUF_Q_RSRV_E, REF_Q_RSRV_I, REF_Q_RSRV_E 466 * BUF_P_RSRV_I, BUF_P_RSRV_E, REF_P_RSRV_I, REF_P_RSRV_E 467 * The following watermarks are controlled implicitly through devlink-sb: 468 * BUF_COL_SHR_I, BUF_COL_SHR_E, REF_COL_SHR_I, REF_COL_SHR_E 469 * The following watermarks are unused and disabled: 470 * BUF_PRIO_SHR_I, BUF_PRIO_SHR_E, REF_PRIO_SHR_I, REF_PRIO_SHR_E 471 * 472 * This function overrides the hardware defaults with more sane ones (no 473 * reservations by default, let sharing use all resources) and disables the 474 * unused watermarks. 475 */ 476static void ocelot_watermark_init(struct ocelot *ocelot) 477{ 478 int all_tcs = GENMASK(OCELOT_NUM_TC - 1, 0); 479 int port; 480 481 ocelot_write(ocelot, all_tcs, QSYS_RES_QOS_MODE); 482 483 for (port = 0; port <= ocelot->num_phys_ports; port++) 484 ocelot_disable_reservation_watermarks(ocelot, port); 485 486 ocelot_disable_tc_sharing_watermarks(ocelot); 487 ocelot_setup_sharing_watermarks(ocelot); 488} 489 490/* Pool size and type are fixed up at runtime. Keeping this structure to 491 * look up the cell size multipliers. 492 */ 493static const struct devlink_sb_pool_info ocelot_sb_pool[] = { 494 [OCELOT_SB_BUF] = { 495 .cell_size = OCELOT_BUFFER_CELL_SZ, 496 .threshold_type = DEVLINK_SB_THRESHOLD_TYPE_STATIC, 497 }, 498 [OCELOT_SB_REF] = { 499 .cell_size = 1, 500 .threshold_type = DEVLINK_SB_THRESHOLD_TYPE_STATIC, 501 }, 502}; 503 504/* Returns the pool size configured through ocelot_sb_pool_set */ 505int ocelot_sb_pool_get(struct ocelot *ocelot, unsigned int sb_index, 506 u16 pool_index, 507 struct devlink_sb_pool_info *pool_info) 508{ 509 if (sb_index >= OCELOT_SB_NUM) 510 return -ENODEV; 511 if (pool_index >= OCELOT_SB_POOL_NUM) 512 return -ENODEV; 513 514 *pool_info = ocelot_sb_pool[sb_index]; 515 pool_info->size = ocelot->pool_size[sb_index][pool_index]; 516 if (pool_index) 517 pool_info->pool_type = DEVLINK_SB_POOL_TYPE_INGRESS; 518 else 519 pool_info->pool_type = DEVLINK_SB_POOL_TYPE_EGRESS; 520 521 return 0; 522} 523EXPORT_SYMBOL(ocelot_sb_pool_get); 524 525/* The pool size received here configures the total amount of resources used on 526 * ingress (or on egress, depending upon the pool index). The pool size, minus 527 * the values for the port and port-tc reservations, is written into the 528 * COL_SHR(dp=0) sharing watermark. 529 */ 530int ocelot_sb_pool_set(struct ocelot *ocelot, unsigned int sb_index, 531 u16 pool_index, u32 size, 532 enum devlink_sb_threshold_type threshold_type, 533 struct netlink_ext_ack *extack) 534{ 535 u32 old_pool_size; 536 int err; 537 538 if (sb_index >= OCELOT_SB_NUM) { 539 NL_SET_ERR_MSG_MOD(extack, 540 "Invalid sb, use 0 for buffers and 1 for frame references"); 541 return -ENODEV; 542 } 543 if (pool_index >= OCELOT_SB_POOL_NUM) { 544 NL_SET_ERR_MSG_MOD(extack, 545 "Invalid pool, use 0 for ingress and 1 for egress"); 546 return -ENODEV; 547 } 548 if (threshold_type != DEVLINK_SB_THRESHOLD_TYPE_STATIC) { 549 NL_SET_ERR_MSG_MOD(extack, 550 "Only static threshold supported"); 551 return -EOPNOTSUPP; 552 } 553 554 old_pool_size = ocelot->pool_size[sb_index][pool_index]; 555 ocelot->pool_size[sb_index][pool_index] = size; 556 557 err = ocelot_watermark_validate(ocelot, extack); 558 if (err) { 559 ocelot->pool_size[sb_index][pool_index] = old_pool_size; 560 return err; 561 } 562 563 ocelot_setup_sharing_watermarks(ocelot); 564 565 return 0; 566} 567EXPORT_SYMBOL(ocelot_sb_pool_set); 568 569/* This retrieves the configuration made with ocelot_sb_port_pool_set */ 570int ocelot_sb_port_pool_get(struct ocelot *ocelot, int port, 571 unsigned int sb_index, u16 pool_index, 572 u32 *p_threshold) 573{ 574 int wm_index; 575 576 switch (sb_index) { 577 case OCELOT_SB_BUF: 578 if (pool_index == OCELOT_SB_POOL_ING) 579 wm_index = BUF_P_RSRV_I(port); 580 else 581 wm_index = BUF_P_RSRV_E(port); 582 break; 583 case OCELOT_SB_REF: 584 if (pool_index == OCELOT_SB_POOL_ING) 585 wm_index = REF_P_RSRV_I(port); 586 else 587 wm_index = REF_P_RSRV_E(port); 588 break; 589 default: 590 return -ENODEV; 591 } 592 593 *p_threshold = ocelot_wm_read(ocelot, wm_index); 594 *p_threshold *= ocelot_sb_pool[sb_index].cell_size; 595 596 return 0; 597} 598EXPORT_SYMBOL(ocelot_sb_port_pool_get); 599 600/* This configures the P_RSRV per-port reserved resource watermark */ 601int ocelot_sb_port_pool_set(struct ocelot *ocelot, int port, 602 unsigned int sb_index, u16 pool_index, 603 u32 threshold, struct netlink_ext_ack *extack) 604{ 605 int wm_index, err; 606 u32 old_thr; 607 608 switch (sb_index) { 609 case OCELOT_SB_BUF: 610 if (pool_index == OCELOT_SB_POOL_ING) 611 wm_index = BUF_P_RSRV_I(port); 612 else 613 wm_index = BUF_P_RSRV_E(port); 614 break; 615 case OCELOT_SB_REF: 616 if (pool_index == OCELOT_SB_POOL_ING) 617 wm_index = REF_P_RSRV_I(port); 618 else 619 wm_index = REF_P_RSRV_E(port); 620 break; 621 default: 622 NL_SET_ERR_MSG_MOD(extack, "Invalid shared buffer"); 623 return -ENODEV; 624 } 625 626 threshold /= ocelot_sb_pool[sb_index].cell_size; 627 628 old_thr = ocelot_wm_read(ocelot, wm_index); 629 ocelot_wm_write(ocelot, wm_index, threshold); 630 631 err = ocelot_watermark_validate(ocelot, extack); 632 if (err) { 633 ocelot_wm_write(ocelot, wm_index, old_thr); 634 return err; 635 } 636 637 ocelot_setup_sharing_watermarks(ocelot); 638 639 return 0; 640} 641EXPORT_SYMBOL(ocelot_sb_port_pool_set); 642 643/* This retrieves the configuration done by ocelot_sb_tc_pool_bind_set */ 644int ocelot_sb_tc_pool_bind_get(struct ocelot *ocelot, int port, 645 unsigned int sb_index, u16 tc_index, 646 enum devlink_sb_pool_type pool_type, 647 u16 *p_pool_index, u32 *p_threshold) 648{ 649 int wm_index; 650 651 switch (sb_index) { 652 case OCELOT_SB_BUF: 653 if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) 654 wm_index = BUF_Q_RSRV_I(port, tc_index); 655 else 656 wm_index = BUF_Q_RSRV_E(port, tc_index); 657 break; 658 case OCELOT_SB_REF: 659 if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) 660 wm_index = REF_Q_RSRV_I(port, tc_index); 661 else 662 wm_index = REF_Q_RSRV_E(port, tc_index); 663 break; 664 default: 665 return -ENODEV; 666 } 667 668 *p_threshold = ocelot_wm_read(ocelot, wm_index); 669 *p_threshold *= ocelot_sb_pool[sb_index].cell_size; 670 671 if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) 672 *p_pool_index = 0; 673 else 674 *p_pool_index = 1; 675 676 return 0; 677} 678EXPORT_SYMBOL(ocelot_sb_tc_pool_bind_get); 679 680/* This configures the Q_RSRV per-port-tc reserved resource watermark */ 681int ocelot_sb_tc_pool_bind_set(struct ocelot *ocelot, int port, 682 unsigned int sb_index, u16 tc_index, 683 enum devlink_sb_pool_type pool_type, 684 u16 pool_index, u32 threshold, 685 struct netlink_ext_ack *extack) 686{ 687 int wm_index, err; 688 u32 old_thr; 689 690 /* Paranoid check? */ 691 if (pool_index == OCELOT_SB_POOL_ING && 692 pool_type != DEVLINK_SB_POOL_TYPE_INGRESS) 693 return -EINVAL; 694 if (pool_index == OCELOT_SB_POOL_EGR && 695 pool_type != DEVLINK_SB_POOL_TYPE_EGRESS) 696 return -EINVAL; 697 698 switch (sb_index) { 699 case OCELOT_SB_BUF: 700 if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) 701 wm_index = BUF_Q_RSRV_I(port, tc_index); 702 else 703 wm_index = BUF_Q_RSRV_E(port, tc_index); 704 break; 705 case OCELOT_SB_REF: 706 if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) 707 wm_index = REF_Q_RSRV_I(port, tc_index); 708 else 709 wm_index = REF_Q_RSRV_E(port, tc_index); 710 break; 711 default: 712 NL_SET_ERR_MSG_MOD(extack, "Invalid shared buffer"); 713 return -ENODEV; 714 } 715 716 threshold /= ocelot_sb_pool[sb_index].cell_size; 717 718 old_thr = ocelot_wm_read(ocelot, wm_index); 719 ocelot_wm_write(ocelot, wm_index, threshold); 720 err = ocelot_watermark_validate(ocelot, extack); 721 if (err) { 722 ocelot_wm_write(ocelot, wm_index, old_thr); 723 return err; 724 } 725 726 ocelot_setup_sharing_watermarks(ocelot); 727 728 return 0; 729} 730EXPORT_SYMBOL(ocelot_sb_tc_pool_bind_set); 731 732/* The hardware does not support atomic snapshots, we'll read out the 733 * occupancy registers individually and have this as just a stub. 734 */ 735int ocelot_sb_occ_snapshot(struct ocelot *ocelot, unsigned int sb_index) 736{ 737 return 0; 738} 739EXPORT_SYMBOL(ocelot_sb_occ_snapshot); 740 741/* The watermark occupancy registers are cleared upon read, 742 * so let's read them. 743 */ 744int ocelot_sb_occ_max_clear(struct ocelot *ocelot, unsigned int sb_index) 745{ 746 u32 inuse, maxuse; 747 int port, prio; 748 749 switch (sb_index) { 750 case OCELOT_SB_BUF: 751 for (port = 0; port <= ocelot->num_phys_ports; port++) { 752 for (prio = 0; prio < OCELOT_NUM_TC; prio++) { 753 ocelot_wm_status(ocelot, BUF_Q_RSRV_I(port, prio), 754 &inuse, &maxuse); 755 ocelot_wm_status(ocelot, BUF_Q_RSRV_E(port, prio), 756 &inuse, &maxuse); 757 } 758 ocelot_wm_status(ocelot, BUF_P_RSRV_I(port), 759 &inuse, &maxuse); 760 ocelot_wm_status(ocelot, BUF_P_RSRV_E(port), 761 &inuse, &maxuse); 762 } 763 break; 764 case OCELOT_SB_REF: 765 for (port = 0; port <= ocelot->num_phys_ports; port++) { 766 for (prio = 0; prio < OCELOT_NUM_TC; prio++) { 767 ocelot_wm_status(ocelot, REF_Q_RSRV_I(port, prio), 768 &inuse, &maxuse); 769 ocelot_wm_status(ocelot, REF_Q_RSRV_E(port, prio), 770 &inuse, &maxuse); 771 } 772 ocelot_wm_status(ocelot, REF_P_RSRV_I(port), 773 &inuse, &maxuse); 774 ocelot_wm_status(ocelot, REF_P_RSRV_E(port), 775 &inuse, &maxuse); 776 } 777 break; 778 default: 779 return -ENODEV; 780 } 781 782 return 0; 783} 784EXPORT_SYMBOL(ocelot_sb_occ_max_clear); 785 786/* This retrieves the watermark occupancy for per-port P_RSRV watermarks */ 787int ocelot_sb_occ_port_pool_get(struct ocelot *ocelot, int port, 788 unsigned int sb_index, u16 pool_index, 789 u32 *p_cur, u32 *p_max) 790{ 791 int wm_index; 792 793 switch (sb_index) { 794 case OCELOT_SB_BUF: 795 if (pool_index == OCELOT_SB_POOL_ING) 796 wm_index = BUF_P_RSRV_I(port); 797 else 798 wm_index = BUF_P_RSRV_E(port); 799 break; 800 case OCELOT_SB_REF: 801 if (pool_index == OCELOT_SB_POOL_ING) 802 wm_index = REF_P_RSRV_I(port); 803 else 804 wm_index = REF_P_RSRV_E(port); 805 break; 806 default: 807 return -ENODEV; 808 } 809 810 ocelot_wm_status(ocelot, wm_index, p_cur, p_max); 811 *p_cur *= ocelot_sb_pool[sb_index].cell_size; 812 *p_max *= ocelot_sb_pool[sb_index].cell_size; 813 814 return 0; 815} 816EXPORT_SYMBOL(ocelot_sb_occ_port_pool_get); 817 818/* This retrieves the watermark occupancy for per-port-tc Q_RSRV watermarks */ 819int ocelot_sb_occ_tc_port_bind_get(struct ocelot *ocelot, int port, 820 unsigned int sb_index, u16 tc_index, 821 enum devlink_sb_pool_type pool_type, 822 u32 *p_cur, u32 *p_max) 823{ 824 int wm_index; 825 826 switch (sb_index) { 827 case OCELOT_SB_BUF: 828 if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) 829 wm_index = BUF_Q_RSRV_I(port, tc_index); 830 else 831 wm_index = BUF_Q_RSRV_E(port, tc_index); 832 break; 833 case OCELOT_SB_REF: 834 if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS) 835 wm_index = REF_Q_RSRV_I(port, tc_index); 836 else 837 wm_index = REF_Q_RSRV_E(port, tc_index); 838 break; 839 default: 840 return -ENODEV; 841 } 842 843 ocelot_wm_status(ocelot, wm_index, p_cur, p_max); 844 *p_cur *= ocelot_sb_pool[sb_index].cell_size; 845 *p_max *= ocelot_sb_pool[sb_index].cell_size; 846 847 return 0; 848} 849EXPORT_SYMBOL(ocelot_sb_occ_tc_port_bind_get); 850 851int ocelot_devlink_sb_register(struct ocelot *ocelot) 852{ 853 int err; 854 855 err = devlink_sb_register(ocelot->devlink, OCELOT_SB_BUF, 856 ocelot->packet_buffer_size, 1, 1, 857 OCELOT_NUM_TC, OCELOT_NUM_TC); 858 if (err) 859 return err; 860 861 err = devlink_sb_register(ocelot->devlink, OCELOT_SB_REF, 862 ocelot->num_frame_refs, 1, 1, 863 OCELOT_NUM_TC, OCELOT_NUM_TC); 864 if (err) { 865 devlink_sb_unregister(ocelot->devlink, OCELOT_SB_BUF); 866 return err; 867 } 868 869 ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_ING] = ocelot->packet_buffer_size; 870 ocelot->pool_size[OCELOT_SB_BUF][OCELOT_SB_POOL_EGR] = ocelot->packet_buffer_size; 871 ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_ING] = ocelot->num_frame_refs; 872 ocelot->pool_size[OCELOT_SB_REF][OCELOT_SB_POOL_EGR] = ocelot->num_frame_refs; 873 874 ocelot_watermark_init(ocelot); 875 876 return 0; 877} 878EXPORT_SYMBOL(ocelot_devlink_sb_register); 879 880void ocelot_devlink_sb_unregister(struct ocelot *ocelot) 881{ 882 devlink_sb_unregister(ocelot->devlink, OCELOT_SB_BUF); 883 devlink_sb_unregister(ocelot->devlink, OCELOT_SB_REF); 884} 885EXPORT_SYMBOL(ocelot_devlink_sb_unregister);