1 /***********************license start*************** 2 * Author: Cavium Networks 3 * 4 * Contact: support@caviumnetworks.com 5 * This file is part of the OCTEON SDK 6 * 7 * Copyright (c) 2003-2008 Cavium Networks 8 * 9 * This file is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License, Version 2, as 11 * published by the Free Software Foundation. 12 * 13 * This file is distributed in the hope that it will be useful, but 14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty 15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or 16 * NONINFRINGEMENT. See the GNU General Public License for more 17 * details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this file; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 22 * or visit http://www.gnu.org/licenses/. 23 * 24 * This file may also be available under a different license from Cavium. 25 * Contact Cavium Networks for more information 26 ***********************license end**************************************/ 27 28 /** 29 * 30 * Interface to the hardware Packet Output unit. 31 * 32 * Starting with SDK 1.7.0, the PKO output functions now support 33 * two types of locking. CVMX_PKO_LOCK_ATOMIC_TAG continues to 34 * function similarly to previous SDKs by using POW atomic tags 35 * to preserve ordering and exclusivity. As a new option, you 36 * can now pass CVMX_PKO_LOCK_CMD_QUEUE which uses a ll/sc 37 * memory based locking instead. This locking has the advantage 38 * of not affecting the tag state but doesn't preserve packet 39 * ordering. CVMX_PKO_LOCK_CMD_QUEUE is appropriate in most 40 * generic code while CVMX_PKO_LOCK_CMD_QUEUE should be used 41 * with hand tuned fast path code. 42 * 43 * Some of other SDK differences visible to the command command 44 * queuing: 45 * - PKO indexes are no longer stored in the FAU. A large 46 * percentage of the FAU register block used to be tied up 47 * maintaining PKO queue pointers. These are now stored in a 48 * global named block. 49 * - The PKO <b>use_locking</b> parameter can now have a global 50 * effect. Since all application use the same named block, 51 * queue locking correctly applies across all operating 52 * systems when using CVMX_PKO_LOCK_CMD_QUEUE. 53 * - PKO 3 word commands are now supported. Use 54 * cvmx_pko_send_packet_finish3(). 55 * 56 */ 57 58 #ifndef __CVMX_PKO_H__ 59 #define __CVMX_PKO_H__ 60 61 #include <asm/octeon/cvmx-fpa.h> 62 #include <asm/octeon/cvmx-pow.h> 63 #include <asm/octeon/cvmx-cmd-queue.h> 64 #include <asm/octeon/cvmx-pko-defs.h> 65 66 /* Adjust the command buffer size by 1 word so that in the case of using only 67 * two word PKO commands no command words stradle buffers. The useful values 68 * for this are 0 and 1. */ 69 #define CVMX_PKO_COMMAND_BUFFER_SIZE_ADJUST (1) 70 71 #define CVMX_PKO_MAX_OUTPUT_QUEUES_STATIC 256 72 #define CVMX_PKO_MAX_OUTPUT_QUEUES ((OCTEON_IS_MODEL(OCTEON_CN31XX) || \ 73 OCTEON_IS_MODEL(OCTEON_CN3010) || OCTEON_IS_MODEL(OCTEON_CN3005) || \ 74 OCTEON_IS_MODEL(OCTEON_CN50XX)) ? 32 : \ 75 (OCTEON_IS_MODEL(OCTEON_CN58XX) || \ 76 OCTEON_IS_MODEL(OCTEON_CN56XX)) ? 256 : 128) 77 #define CVMX_PKO_NUM_OUTPUT_PORTS 40 78 /* use this for queues that are not used */ 79 #define CVMX_PKO_MEM_QUEUE_PTRS_ILLEGAL_PID 63 80 #define CVMX_PKO_QUEUE_STATIC_PRIORITY 9 81 #define CVMX_PKO_ILLEGAL_QUEUE 0xFFFF 82 #define CVMX_PKO_MAX_QUEUE_DEPTH 0 83 84 typedef enum { 85 CVMX_PKO_SUCCESS, 86 CVMX_PKO_INVALID_PORT, 87 CVMX_PKO_INVALID_QUEUE, 88 CVMX_PKO_INVALID_PRIORITY, 89 CVMX_PKO_NO_MEMORY, 90 CVMX_PKO_PORT_ALREADY_SETUP, 91 CVMX_PKO_CMD_QUEUE_INIT_ERROR 92 } cvmx_pko_status_t; 93 94 /** 95 * This enumeration represents the differnet locking modes supported by PKO. 96 */ 97 typedef enum { 98 /* 99 * PKO doesn't do any locking. It is the responsibility of the 100 * application to make sure that no other core is accessing 101 * the same queue at the same time 102 */ 103 CVMX_PKO_LOCK_NONE = 0, 104 /* 105 * PKO performs an atomic tagswitch to insure exclusive access 106 * to the output queue. This will maintain packet ordering on 107 * output. 108 */ 109 CVMX_PKO_LOCK_ATOMIC_TAG = 1, 110 /* 111 * PKO uses the common command queue locks to insure exclusive 112 * access to the output queue. This is a memory based 113 * ll/sc. This is the most portable locking mechanism. 114 */ 115 CVMX_PKO_LOCK_CMD_QUEUE = 2, 116 } cvmx_pko_lock_t; 117 118 typedef struct { 119 uint32_t packets; 120 uint64_t octets; 121 uint64_t doorbell; 122 } cvmx_pko_port_status_t; 123 124 /** 125 * This structure defines the address to use on a packet enqueue 126 */ 127 typedef union { 128 uint64_t u64; 129 struct { 130 /* Must CVMX_IO_SEG */ 131 uint64_t mem_space:2; 132 /* Must be zero */ 133 uint64_t reserved:13; 134 /* Must be one */ 135 uint64_t is_io:1; 136 /* The ID of the device on the non-coherent bus */ 137 uint64_t did:8; 138 /* Must be zero */ 139 uint64_t reserved2:4; 140 /* Must be zero */ 141 uint64_t reserved3:18; 142 /* 143 * The hardware likes to have the output port in 144 * addition to the output queue, 145 */ 146 uint64_t port:6; 147 /* 148 * The output queue to send the packet to (0-127 are 149 * legal) 150 */ 151 uint64_t queue:9; 152 /* Must be zero */ 153 uint64_t reserved4:3; 154 } s; 155 } cvmx_pko_doorbell_address_t; 156 157 /** 158 * Structure of the first packet output command word. 159 */ 160 typedef union { 161 uint64_t u64; 162 struct { 163 /* 164 * The size of the reg1 operation - could be 8, 16, 165 * 32, or 64 bits. 166 */ 167 uint64_t size1:2; 168 /* 169 * The size of the reg0 operation - could be 8, 16, 170 * 32, or 64 bits. 171 */ 172 uint64_t size0:2; 173 /* 174 * If set, subtract 1, if clear, subtract packet 175 * size. 176 */ 177 uint64_t subone1:1; 178 /* 179 * The register, subtract will be done if reg1 is 180 * non-zero. 181 */ 182 uint64_t reg1:11; 183 /* If set, subtract 1, if clear, subtract packet size */ 184 uint64_t subone0:1; 185 /* The register, subtract will be done if reg0 is non-zero */ 186 uint64_t reg0:11; 187 /* 188 * When set, interpret segment pointer and segment 189 * bytes in little endian order. 190 */ 191 uint64_t le:1; 192 /* 193 * When set, packet data not allocated in L2 cache by 194 * PKO. 195 */ 196 uint64_t n2:1; 197 /* 198 * If set and rsp is set, word3 contains a pointer to 199 * a work queue entry. 200 */ 201 uint64_t wqp:1; 202 /* If set, the hardware will send a response when done */ 203 uint64_t rsp:1; 204 /* 205 * If set, the supplied pkt_ptr is really a pointer to 206 * a list of pkt_ptr's. 207 */ 208 uint64_t gather:1; 209 /* 210 * If ipoffp1 is non zero, (ipoffp1-1) is the number 211 * of bytes to IP header, and the hardware will 212 * calculate and insert the UDP/TCP checksum. 213 */ 214 uint64_t ipoffp1:7; 215 /* 216 * If set, ignore the I bit (force to zero) from all 217 * pointer structures. 218 */ 219 uint64_t ignore_i:1; 220 /* 221 * If clear, the hardware will attempt to free the 222 * buffers containing the packet. 223 */ 224 uint64_t dontfree:1; 225 /* 226 * The total number of segs in the packet, if gather 227 * set, also gather list length. 228 */ 229 uint64_t segs:6; 230 /* Including L2, but no trailing CRC */ 231 uint64_t total_bytes:16; 232 } s; 233 } cvmx_pko_command_word0_t; 234 235 /* CSR typedefs have been moved to cvmx-csr-*.h */ 236 237 /** 238 * Definition of internal state for Packet output processing 239 */ 240 typedef struct { 241 /* ptr to start of buffer, offset kept in FAU reg */ 242 uint64_t *start_ptr; 243 } cvmx_pko_state_elem_t; 244 245 /** 246 * Call before any other calls to initialize the packet 247 * output system. 248 */ 249 extern void cvmx_pko_initialize_global(void); 250 extern int cvmx_pko_initialize_local(void); 251 252 /** 253 * Enables the packet output hardware. It must already be 254 * configured. 255 */ 256 extern void cvmx_pko_enable(void); 257 258 /** 259 * Disables the packet output. Does not affect any configuration. 260 */ 261 extern void cvmx_pko_disable(void); 262 263 /** 264 * Shutdown and free resources required by packet output. 265 */ 266 267 extern void cvmx_pko_shutdown(void); 268 269 /** 270 * Configure a output port and the associated queues for use. 271 * 272 * @port: Port to configure. 273 * @base_queue: First queue number to associate with this port. 274 * @num_queues: Number of queues t oassociate with this port 275 * @priority: Array of priority levels for each queue. Values are 276 * allowed to be 1-8. A value of 8 get 8 times the traffic 277 * of a value of 1. There must be num_queues elements in the 278 * array. 279 */ 280 extern cvmx_pko_status_t cvmx_pko_config_port(uint64_t port, 281 uint64_t base_queue, 282 uint64_t num_queues, 283 const uint64_t priority[]); 284 285 /** 286 * Ring the packet output doorbell. This tells the packet 287 * output hardware that "len" command words have been added 288 * to its pending list. This command includes the required 289 * CVMX_SYNCWS before the doorbell ring. 290 * 291 * @port: Port the packet is for 292 * @queue: Queue the packet is for 293 * @len: Length of the command in 64 bit words 294 */ 295 static inline void cvmx_pko_doorbell(uint64_t port, uint64_t queue, 296 uint64_t len) 297 { 298 cvmx_pko_doorbell_address_t ptr; 299 300 ptr.u64 = 0; 301 ptr.s.mem_space = CVMX_IO_SEG; 302 ptr.s.did = CVMX_OCT_DID_PKT_SEND; 303 ptr.s.is_io = 1; 304 ptr.s.port = port; 305 ptr.s.queue = queue; 306 /* 307 * Need to make sure output queue data is in DRAM before 308 * doorbell write. 309 */ 310 CVMX_SYNCWS; 311 cvmx_write_io(ptr.u64, len); 312 } 313 314 /** 315 * Prepare to send a packet. This may initiate a tag switch to 316 * get exclusive access to the output queue structure, and 317 * performs other prep work for the packet send operation. 318 * 319 * cvmx_pko_send_packet_finish() MUST be called after this function is called, 320 * and must be called with the same port/queue/use_locking arguments. 321 * 322 * The use_locking parameter allows the caller to use three 323 * possible locking modes. 324 * - CVMX_PKO_LOCK_NONE 325 * - PKO doesn't do any locking. It is the responsibility 326 * of the application to make sure that no other core 327 * is accessing the same queue at the same time. 328 * - CVMX_PKO_LOCK_ATOMIC_TAG 329 * - PKO performs an atomic tagswitch to insure exclusive 330 * access to the output queue. This will maintain 331 * packet ordering on output. 332 * - CVMX_PKO_LOCK_CMD_QUEUE 333 * - PKO uses the common command queue locks to insure 334 * exclusive access to the output queue. This is a 335 * memory based ll/sc. This is the most portable 336 * locking mechanism. 337 * 338 * NOTE: If atomic locking is used, the POW entry CANNOT be 339 * descheduled, as it does not contain a valid WQE pointer. 340 * 341 * @port: Port to send it on 342 * @queue: Queue to use 343 * @use_locking: CVMX_PKO_LOCK_NONE, CVMX_PKO_LOCK_ATOMIC_TAG, or 344 * CVMX_PKO_LOCK_CMD_QUEUE 345 */ 346 347 static inline void cvmx_pko_send_packet_prepare(uint64_t port, uint64_t queue, 348 cvmx_pko_lock_t use_locking) 349 { 350 if (use_locking == CVMX_PKO_LOCK_ATOMIC_TAG) { 351 /* 352 * Must do a full switch here to handle all cases. We 353 * use a fake WQE pointer, as the POW does not access 354 * this memory. The WQE pointer and group are only 355 * used if this work is descheduled, which is not 356 * supported by the 357 * cvmx_pko_send_packet_prepare/cvmx_pko_send_packet_finish 358 * combination. Note that this is a special case in 359 * which these fake values can be used - this is not a 360 * general technique. 361 */ 362 uint32_t tag = 363 CVMX_TAG_SW_BITS_INTERNAL << CVMX_TAG_SW_SHIFT | 364 CVMX_TAG_SUBGROUP_PKO << CVMX_TAG_SUBGROUP_SHIFT | 365 (CVMX_TAG_SUBGROUP_MASK & queue); 366 cvmx_pow_tag_sw_full((cvmx_wqe_t *) cvmx_phys_to_ptr(0x80), tag, 367 CVMX_POW_TAG_TYPE_ATOMIC, 0); 368 } 369 } 370 371 /** 372 * Complete packet output. cvmx_pko_send_packet_prepare() must be 373 * called exactly once before this, and the same parameters must be 374 * passed to both cvmx_pko_send_packet_prepare() and 375 * cvmx_pko_send_packet_finish(). 376 * 377 * @port: Port to send it on 378 * @queue: Queue to use 379 * @pko_command: 380 * PKO HW command word 381 * @packet: Packet to send 382 * @use_locking: CVMX_PKO_LOCK_NONE, CVMX_PKO_LOCK_ATOMIC_TAG, or 383 * CVMX_PKO_LOCK_CMD_QUEUE 384 * 385 * Returns returns CVMX_PKO_SUCCESS on success, or error code on 386 * failure of output 387 */ 388 static inline cvmx_pko_status_t cvmx_pko_send_packet_finish( 389 uint64_t port, 390 uint64_t queue, 391 cvmx_pko_command_word0_t pko_command, 392 union cvmx_buf_ptr packet, 393 cvmx_pko_lock_t use_locking) 394 { 395 cvmx_cmd_queue_result_t result; 396 if (use_locking == CVMX_PKO_LOCK_ATOMIC_TAG) 397 cvmx_pow_tag_sw_wait(); 398 result = cvmx_cmd_queue_write2(CVMX_CMD_QUEUE_PKO(queue), 399 (use_locking == CVMX_PKO_LOCK_CMD_QUEUE), 400 pko_command.u64, packet.u64); 401 if (likely(result == CVMX_CMD_QUEUE_SUCCESS)) { 402 cvmx_pko_doorbell(port, queue, 2); 403 return CVMX_PKO_SUCCESS; 404 } else if ((result == CVMX_CMD_QUEUE_NO_MEMORY) 405 || (result == CVMX_CMD_QUEUE_FULL)) { 406 return CVMX_PKO_NO_MEMORY; 407 } else { 408 return CVMX_PKO_INVALID_QUEUE; 409 } 410 } 411 412 /** 413 * Complete packet output. cvmx_pko_send_packet_prepare() must be 414 * called exactly once before this, and the same parameters must be 415 * passed to both cvmx_pko_send_packet_prepare() and 416 * cvmx_pko_send_packet_finish(). 417 * 418 * @port: Port to send it on 419 * @queue: Queue to use 420 * @pko_command: 421 * PKO HW command word 422 * @packet: Packet to send 423 * @addr: Plysical address of a work queue entry or physical address 424 * to zero on complete. 425 * @use_locking: CVMX_PKO_LOCK_NONE, CVMX_PKO_LOCK_ATOMIC_TAG, or 426 * CVMX_PKO_LOCK_CMD_QUEUE 427 * 428 * Returns returns CVMX_PKO_SUCCESS on success, or error code on 429 * failure of output 430 */ 431 static inline cvmx_pko_status_t cvmx_pko_send_packet_finish3( 432 uint64_t port, 433 uint64_t queue, 434 cvmx_pko_command_word0_t pko_command, 435 union cvmx_buf_ptr packet, 436 uint64_t addr, 437 cvmx_pko_lock_t use_locking) 438 { 439 cvmx_cmd_queue_result_t result; 440 if (use_locking == CVMX_PKO_LOCK_ATOMIC_TAG) 441 cvmx_pow_tag_sw_wait(); 442 result = cvmx_cmd_queue_write3(CVMX_CMD_QUEUE_PKO(queue), 443 (use_locking == CVMX_PKO_LOCK_CMD_QUEUE), 444 pko_command.u64, packet.u64, addr); 445 if (likely(result == CVMX_CMD_QUEUE_SUCCESS)) { 446 cvmx_pko_doorbell(port, queue, 3); 447 return CVMX_PKO_SUCCESS; 448 } else if ((result == CVMX_CMD_QUEUE_NO_MEMORY) 449 || (result == CVMX_CMD_QUEUE_FULL)) { 450 return CVMX_PKO_NO_MEMORY; 451 } else { 452 return CVMX_PKO_INVALID_QUEUE; 453 } 454 } 455 456 /** 457 * Return the pko output queue associated with a port and a specific core. 458 * In normal mode (PKO lockless operation is disabled), the value returned 459 * is the base queue. 460 * 461 * @port: Port number 462 * @core: Core to get queue for 463 * 464 * Returns Core-specific output queue 465 */ 466 static inline int cvmx_pko_get_base_queue_per_core(int port, int core) 467 { 468 #ifndef CVMX_HELPER_PKO_MAX_PORTS_INTERFACE0 469 #define CVMX_HELPER_PKO_MAX_PORTS_INTERFACE0 16 470 #endif 471 #ifndef CVMX_HELPER_PKO_MAX_PORTS_INTERFACE1 472 #define CVMX_HELPER_PKO_MAX_PORTS_INTERFACE1 16 473 #endif 474 475 if (port < CVMX_PKO_MAX_PORTS_INTERFACE0) 476 return port * CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 + core; 477 else if (port >= 16 && port < 16 + CVMX_PKO_MAX_PORTS_INTERFACE1) 478 return CVMX_PKO_MAX_PORTS_INTERFACE0 * 479 CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 + (port - 480 16) * 481 CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 + core; 482 else if ((port >= 32) && (port < 36)) 483 return CVMX_PKO_MAX_PORTS_INTERFACE0 * 484 CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 + 485 CVMX_PKO_MAX_PORTS_INTERFACE1 * 486 CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 + (port - 487 32) * 488 CVMX_PKO_QUEUES_PER_PORT_PCI; 489 else if ((port >= 36) && (port < 40)) 490 return CVMX_PKO_MAX_PORTS_INTERFACE0 * 491 CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 + 492 CVMX_PKO_MAX_PORTS_INTERFACE1 * 493 CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 + 494 4 * CVMX_PKO_QUEUES_PER_PORT_PCI + (port - 495 36) * 496 CVMX_PKO_QUEUES_PER_PORT_LOOP; 497 else 498 /* Given the limit on the number of ports we can map to 499 * CVMX_MAX_OUTPUT_QUEUES_STATIC queues (currently 256, 500 * divided among all cores), the remaining unmapped ports 501 * are assigned an illegal queue number */ 502 return CVMX_PKO_ILLEGAL_QUEUE; 503 } 504 505 /** 506 * For a given port number, return the base pko output queue 507 * for the port. 508 * 509 * @port: Port number 510 * Returns Base output queue 511 */ 512 static inline int cvmx_pko_get_base_queue(int port) 513 { 514 return cvmx_pko_get_base_queue_per_core(port, 0); 515 } 516 517 /** 518 * For a given port number, return the number of pko output queues. 519 * 520 * @port: Port number 521 * Returns Number of output queues 522 */ 523 static inline int cvmx_pko_get_num_queues(int port) 524 { 525 if (port < 16) 526 return CVMX_PKO_QUEUES_PER_PORT_INTERFACE0; 527 else if (port < 32) 528 return CVMX_PKO_QUEUES_PER_PORT_INTERFACE1; 529 else if (port < 36) 530 return CVMX_PKO_QUEUES_PER_PORT_PCI; 531 else if (port < 40) 532 return CVMX_PKO_QUEUES_PER_PORT_LOOP; 533 else 534 return 0; 535 } 536 537 /** 538 * Get the status counters for a port. 539 * 540 * @port_num: Port number to get statistics for. 541 * @clear: Set to 1 to clear the counters after they are read 542 * @status: Where to put the results. 543 */ 544 static inline void cvmx_pko_get_port_status(uint64_t port_num, uint64_t clear, 545 cvmx_pko_port_status_t *status) 546 { 547 union cvmx_pko_reg_read_idx pko_reg_read_idx; 548 union cvmx_pko_mem_count0 pko_mem_count0; 549 union cvmx_pko_mem_count1 pko_mem_count1; 550 551 pko_reg_read_idx.u64 = 0; 552 pko_reg_read_idx.s.index = port_num; 553 cvmx_write_csr(CVMX_PKO_REG_READ_IDX, pko_reg_read_idx.u64); 554 555 pko_mem_count0.u64 = cvmx_read_csr(CVMX_PKO_MEM_COUNT0); 556 status->packets = pko_mem_count0.s.count; 557 if (clear) { 558 pko_mem_count0.s.count = port_num; 559 cvmx_write_csr(CVMX_PKO_MEM_COUNT0, pko_mem_count0.u64); 560 } 561 562 pko_mem_count1.u64 = cvmx_read_csr(CVMX_PKO_MEM_COUNT1); 563 status->octets = pko_mem_count1.s.count; 564 if (clear) { 565 pko_mem_count1.s.count = port_num; 566 cvmx_write_csr(CVMX_PKO_MEM_COUNT1, pko_mem_count1.u64); 567 } 568 569 if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) { 570 union cvmx_pko_mem_debug9 debug9; 571 pko_reg_read_idx.s.index = cvmx_pko_get_base_queue(port_num); 572 cvmx_write_csr(CVMX_PKO_REG_READ_IDX, pko_reg_read_idx.u64); 573 debug9.u64 = cvmx_read_csr(CVMX_PKO_MEM_DEBUG9); 574 status->doorbell = debug9.cn38xx.doorbell; 575 } else { 576 union cvmx_pko_mem_debug8 debug8; 577 pko_reg_read_idx.s.index = cvmx_pko_get_base_queue(port_num); 578 cvmx_write_csr(CVMX_PKO_REG_READ_IDX, pko_reg_read_idx.u64); 579 debug8.u64 = cvmx_read_csr(CVMX_PKO_MEM_DEBUG8); 580 status->doorbell = debug8.cn58xx.doorbell; 581 } 582 } 583 584 /** 585 * Rate limit a PKO port to a max packets/sec. This function is only 586 * supported on CN57XX, CN56XX, CN55XX, and CN54XX. 587 * 588 * @port: Port to rate limit 589 * @packets_s: Maximum packet/sec 590 * @burst: Maximum number of packets to burst in a row before rate 591 * limiting cuts in. 592 * 593 * Returns Zero on success, negative on failure 594 */ 595 extern int cvmx_pko_rate_limit_packets(int port, int packets_s, int burst); 596 597 /** 598 * Rate limit a PKO port to a max bits/sec. This function is only 599 * supported on CN57XX, CN56XX, CN55XX, and CN54XX. 600 * 601 * @port: Port to rate limit 602 * @bits_s: PKO rate limit in bits/sec 603 * @burst: Maximum number of bits to burst before rate 604 * limiting cuts in. 605 * 606 * Returns Zero on success, negative on failure 607 */ 608 extern int cvmx_pko_rate_limit_bits(int port, uint64_t bits_s, int burst); 609 610 #endif /* __CVMX_PKO_H__ */ 611