1 /* 2 * Copyright (c) 2015-2023 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29 /* 30 * Copyright (C) 2012-2014 Matteo Landi, Luigi Rizzo, Giuseppe Lettieri. 31 * All rights reserved. 32 * Copyright (C) 2013-2014 Universita` di Pisa. All rights reserved. 33 * 34 * Redistribution and use in source and binary forms, with or without 35 * modification, are permitted provided that the following conditions 36 * are met: 37 * 1. Redistributions of source code must retain the above copyright 38 * notice, this list of conditions and the following disclaimer. 39 * 2. Redistributions in binary form must reproduce the above copyright 40 * notice, this list of conditions and the following disclaimer in the 41 * documentation and/or other materials provided with the distribution. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56 #ifndef _SKYWALK_OS_CHANNEL_PRIVATE_H_ 57 #define _SKYWALK_OS_CHANNEL_PRIVATE_H_ 58 59 #if defined(PRIVATE) || defined(BSD_KERNEL_PRIVATE) 60 #include <sys/time.h> 61 #include <sys/signal.h> 62 #include <sys/guarded.h> 63 #include <sys/utsname.h> 64 #include <skywalk/os_channel.h> 65 #include <skywalk/os_stats_private.h> 66 67 /* BEGIN CSTYLED */ 68 /* 69 * The userspace data structures used by Skywalk are shown below. 70 * 71 * The kernel allocates the regions for the various object types, 72 * and maps them to the userspace task in a contiguous span, one 73 * after another. 74 * 75 * Each channel file descriptor comes with its own memory map, 76 * and the layout of the rest of the objects is described in the 77 * __user_channel_schema structure associated with the channel. 78 * This schema structure is mapped read-only in the task. 79 * 80 * +=======================+ 81 * | __user_channel_schema | (1 per channel fd) 82 * +=======================+ 83 * | csm_ver | 84 * | csm_flags | 85 * |-----------------------| 86 * | csm_tx_rings | 87 * | csm_rx_rings | 88 * | csm_allocator_rings | 89 * | csm_event_rings | 90 * |-----------------------| 91 * | csm_stats_ofs | <<---+ 92 * |-----------------------| | 93 * | csm_flowadv_max | | 94 * | csm_flowadv_ofs | <<---+ relative to base of memory map 95 * |-----------------------| | 96 * | csm_md_redzone_cookie | | 97 * | csm_md_type | | 98 * | csm_md_subtype | | 99 * |-----------------------| | 100 * | csm_stats_ofs | <<---+ 101 * | csm_stats_type | | 102 * |-----------------------| | 103 * | csm_nexusadv_ofs | <<---+ 104 * |-----------------------| 105 * | csm_kern_name | 106 * | csm_kern_uuid | 107 * |-----------------------| 108 * | TX csm_ring_ofs[0] | <<---+ 109 * | TX csm_sd_ofs[0] | | 110 * : ... : | 111 * | TX csm_ring_ofs[t] | | 112 * | TX csm_sd_ofs[t] | | 113 * |-----------------------| | 114 * | RX csm_ring_ofs[0] | <<---+ these offsets are relative 115 * | RX csm_sd_ofs[0] | | to each schema structure 116 * : ... : | 117 * | RX csm_ring_ofs[t] | | 118 * | RX csm_sd_ofs[t] | | 119 * |-----------------------| | 120 * | A csm_ring_ofs[0] | | 121 * | A csm_sd_ofs[0] | | 122 * : ... : | 123 * | A csm_ring_ofs[t] | <<---+ 124 * | A csm_sd_ofs[t] | | 125 * |-----------------------| | 126 * | F csm_ring_ofs[0] | | 127 * | F csm_sd_ofs[0] | | 128 * : ... : | 129 * | F csm_ring_ofs[t] | <<---+ 130 * | F csm_sd_ofs[t] | | 131 * |-----------------------| | 132 * | EV csm_ring_ofs[0] | <<---+ 133 * | EV csm_sd_ofs[0] | 134 * +-----------------------+ 135 * (variable length) 136 * 137 * On nexus adapters that support statistics or flow advisory, the 138 * csm_stats_ofs or csm_flowadv_ofs would be non-zero, and their values 139 * represent the offset to the respective objects from the base of the 140 * memory map. This is because those regions are shared amongst all 141 * channels opened to the adapter associated with the nexus port. 142 * 143 * Other regions, such as rings and slot descriptors, are unique to the 144 * channel itself. They are always present, and their values indicated 145 * by csm_{ring,sd}_ofs represent the offset to the respective objects 146 * from the schema pointer (not from base of memory map.) This is done 147 * to support channels bound to any of the adapter's ring-pairs. 148 * 149 * See notes below on CSM_CURRENT_VERSION. 150 */ 151 /* END CSTYLED */ 152 #define CHANNEL_SCHEMA_KERN_NAME _SYS_NAMELEN 153 struct __user_channel_schema { 154 /* 155 * Schema properties, kernel version string and kernel 156 * executable UUID (for debugging). These 4 fields 157 * must be at the beginning of the structure. 158 */ 159 const uint32_t csm_ver; /* schema layout version */ 160 const volatile uint32_t csm_flags; /* CSM_* flags */ 161 char csm_kern_name[CHANNEL_SCHEMA_KERN_NAME]; 162 uuid_t csm_kern_uuid; 163 164 /* Number of UPP buffers in use and max */ 165 volatile uint64_t csm_upp_buf_inuse; 166 volatile uint64_t csm_upp_buf_total; 167 168 /* 169 * The rest of the fields may be rearranged as needed, with 170 * the expectation that CSM_CURRENT_VERSION be bumped up on 171 * each modification. 172 */ 173 174 /* 175 * The number of packet rings available for this channel. 176 */ 177 uint32_t csm_tx_rings; /* # of tx rings */ 178 uint32_t csm_rx_rings; /* # of rx rings */ 179 180 /* 181 * The number of allocator ring pair available for this channel. 182 * If the channel supports user packet pool then 1 pair of 183 * alloc/free ring per channel are used to manage the packet 184 * allocation from userspace. 185 * If the channel supports multi-buflet packet then an additional pair 186 * of alloc/free ring is used to manage the buffer (buflet) allocation 187 * from userspace. 188 */ 189 uint32_t csm_allocator_ring_pairs; 190 191 /* 192 * number of event rings for this channel. 193 */ 194 uint32_t csm_num_event_rings; 195 uint32_t csm_large_buf_alloc_rings; 196 197 /* 198 * Flow advisory region offset; this field will be 0 if the 199 * nexus isn't capable of flow advisory scheme. Otherwise, 200 * it points to a table of flow advisory entries, and the 201 * total number of entries is indicated by csm_flowadv_max. 202 */ 203 const uint32_t csm_flowadv_max; 204 const mach_vm_offset_t csm_flowadv_ofs 205 __attribute__((aligned(sizeof(uint64_t)))); 206 207 /* 208 * Metadata region redzone, type and sub-type. 209 */ 210 const uint64_t csm_md_redzone_cookie /* metadata redzone cookie */ 211 __attribute__((aligned(sizeof(uint64_t)))); 212 const nexus_meta_type_t csm_md_type; /* metadata type */ 213 const nexus_meta_subtype_t csm_md_subtype; /* metadata subtype */ 214 215 /* 216 * Statistics region offset; each nexus is free to use this 217 * region and break it up into multiple smaller regions if 218 * needed. The definition and interpretation of the contents 219 * is left to the nexus. The value of this field will be 0 220 * if the nexus doesn't facilitate shareable statistics. 221 */ 222 const mach_vm_offset_t csm_stats_ofs 223 __attribute__((aligned(sizeof(uint64_t)))); 224 const nexus_stats_type_t csm_stats_type; 225 226 /* 227 * Nexus advisory region offset; this field will be 0 if the 228 * nexus isn't providing any nexus-wide advisories. Otherwise, 229 * it points to the nexus advisory structure. 230 */ 231 const mach_vm_offset_t csm_nexusadv_ofs 232 __attribute__((aligned(sizeof(uint64_t)))); 233 234 /* 235 * The following array contains the offset of each channel ring 236 * from the beginning of this structure, as well as the ring's 237 * slot descriptor, in the following order: 238 * 239 * tx rings (csm_tx_rings-csm_htx_rings) 240 * rx rings (csm_rx_rings-csm_hrx_rings) 241 * allocator rings (either 2 or 4 or none) (optional) 242 * event rings (optional) 243 * 244 * The area is filled up by the kernel, and then only read 245 * by userspace code. 246 */ 247 struct { 248 const mach_vm_offset_t ring_off; /* __user_channel_ring */ 249 const mach_vm_offset_t sd_off; /* __slot_desc */ 250 } csm_ring_ofs[__counted_by(csm_tx_rings + csm_rx_rings + 251 csm_allocator_ring_pairs + csm_num_event_rings + csm_large_buf_alloc_rings)] 252 __attribute__((aligned(sizeof(uint64_t)))); 253 }; 254 255 /* 256 * Schema layout version. Make sure to bump this up each time 257 * struct __user_channel_schema layout is modified. This helps 258 * to ensure that both kernel and libsystem_kernel are in sync, 259 * as otherwise we'd assert due to version mismatch. 260 */ 261 #define CSM_CURRENT_VERSION 19 262 263 /* valid values for csm_flags */ 264 #define CSM_PRIV_MEM 0x1 /* private memory region */ 265 #define CSM_ACTIVE (1U << 31) /* channel is active */ 266 267 #define CSM_BITS "\020\01PRIV_MEM\040ACTIVE" 268 269 /* the size of __user_channel_schema structure for n total rings */ 270 #define CHANNEL_SCHEMA_SIZE(n) \ 271 __builtin_offsetof(struct __user_channel_schema, csm_ring_ofs[(n)]) 272 273 /* 274 * Some fields should be cache-aligned to reduce contention. 275 * The alignment is architecture and OS dependent; we use an 276 * estimate that should cover most architectures. 277 */ 278 #define CHANNEL_CACHE_ALIGN_MAX 128 /* max cache line size */ 279 280 /* 281 * Ring kind. 282 */ 283 #define CR_KIND_RX 0 /* same as NR_RX */ 284 #define CR_KIND_TX 1 /* same as NR_TX */ 285 #define CR_KIND_ALLOC 2 /* same as NR_A */ 286 #define CR_KIND_FREE 3 /* same as NR_F */ 287 #define CR_KIND_EVENT 4 /* same as NR_EV */ 288 #define CR_KIND_LARGE_BUF_ALLOC 5 /* same as NR_LBA */ 289 290 typedef uint32_t slot_idx_t; 291 292 typedef uint32_t obj_idx_t; 293 #define OBJ_IDX_NONE ((obj_idx_t)-1) 294 295 /* 296 * This structure contains per-slot properties for userspace. If the flag 297 * SD_IDX_VALID is set, the descriptor contains the index of the metadata 298 * attached to the slot. 299 * 300 * TODO: [email protected] -- this will be made read-write for user pool. 301 * TODO: [email protected] -- Should we make use of RX/TX 302 * preparation/writeback descriptors (in a union) for sd_len? 303 */ 304 struct __user_slot_desc { 305 obj_idx_t sd_md_idx; /* metadata index */ 306 uint16_t sd_flags; /* slot flags */ 307 /* 308 * XXX: sd_len is currently used only for the purpose of acoounting 309 * for the number of bytes pending to be read by the user channel. 310 * Currently the maximum size of a packet being transported on user 311 * channel is <= UINT16_MAX, so sd_len being uint16_t is fine, but 312 * this needs to be changed if we want to go beyond UINT16_MAX. 313 */ 314 uint16_t sd_len; /* slot len */ 315 }; 316 317 /* valid values for sd_flags */ 318 #define SD_IDX_VALID 0x1 /* slot has metadata attached */ 319 #ifdef KERNEL 320 #define SD_LEN_VALID 0x2 /* slot has packet length recorded */ 321 #define SD_KERNEL_ONLY (1 << 15) /* kernel only; no user counterpart */ 322 323 #define SD_FLAGS_USER (SD_IDX_VALID) 324 /* invariant flags we want to keep */ 325 #define SD_SAVE_MASK (SD_KERNEL_ONLY) 326 #endif /* KERNEL */ 327 /* 328 * SD_VALID_METADATA() returns TRUE if the slot has an attached metadata 329 */ 330 #define SD_VALID_METADATA(_sd) \ 331 (!!((_sd)->sd_flags & SD_IDX_VALID)) 332 333 /* 334 * Slot descriptor. 335 */ 336 struct __slot_desc { 337 union { 338 struct __user_slot_desc _sd_user; 339 uint64_t _sd_private[1]; 340 }; 341 }; 342 343 #define SLOT_DESC_SZ (sizeof (struct __slot_desc)) 344 #define SLOT_DESC_USD(_sdp) (&(_sdp)->_sd_user) 345 346 /* 347 * Ring. 348 * 349 * Channel representation of a TX or RX ring (also known as "queue"). 350 * This is a queue implemented as a fixed-size circular array. 351 * At the software level the important fields are: head, cur, tail. 352 * 353 * The __user_channel_ring, and all slots and buffers in the range 354 * [head .. tail-1] are owned by the user program; the kernel only 355 * accesses them during a channel system call and in the user thread 356 * context. 357 */ 358 struct __user_channel_ring { 359 /* 360 * In TX rings: 361 * 362 * head first slot available for transmission; 363 * tail (readonly) first slot reserved to the kernel 364 * khead (readonly) kernel's view of next slot to send 365 * since last sync. 366 * 367 * [head .. tail-1] can be used for new packets to send; 368 * 369 * 'head' must be incremented as slots are filled with new packets to 370 * be sent; 371 * 372 * In RX rings: 373 * 374 * head first valid received packet; 375 * tail (readonly) first slot reserved to the kernel 376 * khead (readonly) kernel's view of next slot to reclaim 377 * since last sync. 378 * 379 * [head .. tail-1] contain received packets; 380 * 381 * 'head' must be incremented as slots are consumed and can be returned 382 * to the kernel; 383 * 384 */ 385 volatile slot_idx_t ring_head; /* (u) first user slot */ 386 const volatile slot_idx_t ring_tail; /* (k) first kernel slot */ 387 const volatile slot_idx_t ring_khead; /* (k) next to send/reclaim */ 388 389 const uint32_t ring_num_slots; /* # of slots in the ring */ 390 const uint32_t ring_def_buf_size; /* size of each default buffer */ 391 const uint32_t ring_large_buf_size; /* size of each large buffer */ 392 const uint16_t ring_md_size; /* size of each metadata */ 393 const uint16_t ring_bft_size; /* size of each buflet metadata */ 394 const uint16_t ring_id; /* unused */ 395 const uint16_t ring_kind; /* kind of ring (tx or rx) */ 396 397 /* 398 * Base addresses of {buf, metadata, slot descriptor} regions 399 * from this ring descriptor. This facilitates computing the 400 * addresses of those regions in the task's mapped memory. 401 */ 402 /* base address of default buffer region */ 403 const mach_vm_offset_t ring_def_buf_base 404 __attribute((aligned(sizeof(uint64_t)))); 405 /* base address of large buffer region */ 406 const mach_vm_offset_t ring_large_buf_base 407 __attribute((aligned(sizeof(uint64_t)))); 408 const mach_vm_offset_t ring_md_base /* base of metadata region */ 409 __attribute((aligned(sizeof(uint64_t)))); 410 const mach_vm_offset_t ring_sd_base /* base of slot desc region */ 411 __attribute((aligned(sizeof(uint64_t)))); 412 /* 413 * base of buflet metadata region 414 * value of 0 means that external buflet metadata is not present. 415 */ 416 const mach_vm_offset_t ring_bft_base 417 __attribute((aligned(sizeof(uint64_t)))); 418 419 const volatile uint64_t ring_sync_time /* (k) time of last sync */ 420 __attribute((aligned(sizeof(uint64_t)))); 421 const volatile uint64_t ring_notify_time /* (k) time of last notify */ 422 __attribute((aligned(sizeof(uint64_t)))); 423 /* current working set for the packet allocator ring */ 424 const volatile uint32_t ring_alloc_ws; 425 /* current working set for the buflet allocator ring */ 426 const volatile uint32_t ring_alloc_buf_ws; 427 }; 428 429 /* check if space is available in the ring */ 430 #define CHANNEL_RING_EMPTY(_ring) ((_ring)->ring_head == (_ring)->ring_tail) 431 432 /* 433 * Flow advisory. 434 * 435 * Each flow that is registered with the nexus capable of supporting 436 * flow advisory is given an entry. Each entry resides in the flow 437 * advisory table that is mapped to the task. 438 * fae_id: is the flow identifier used by libnetcore to identify a flow. 439 * This identifier is passed as a metadata on all packets 440 * generated by the user space stack. This is the flow_id parameter 441 * which should be used while checking if a flow is 442 * admissible using the API os_channel_flow_admissible(). 443 * fae_flowid: is a globally unique flow identifier generated by the 444 * flowswitch for each flow. Flowswitch stamps every TX packet 445 * with this identifier. This is the flow identifier which would 446 * be visible to the AQM logic and the driver. The flow advisory 447 * mechanism in kernel uses this fae_id to identify the flow entry 448 * in the flow advisory table. 449 */ 450 struct __flowadv_entry { 451 union { 452 uint64_t fae_id_64[2]; 453 uint32_t fae_id_32[4]; 454 uuid_t fae_id; /* flow ID from userspace stack */ 455 }; 456 volatile uint32_t fae_congestion_cnt; 457 volatile uint32_t fae_pkt_cnt; 458 volatile uint32_t fae_flags; /* flags FLOWADVF_* */ 459 /* flow ID generated by flowswitch */ 460 uint32_t fae_flowid; 461 #ifdef KERNEL 462 #define fae_token fae_flowid 463 #endif /* KERNEL */ 464 } __attribute__((aligned(sizeof(uint64_t)))); 465 466 #define FLOWADVF_VALID 0x1 /* flow is valid */ 467 #define FLOWADVF_SUSPENDED 0x2 /* flow is suspended */ 468 469 /* channel event threshold */ 470 struct ch_ev_thresh { 471 channel_threshold_unit_t cet_unit; 472 uint32_t cet_value; 473 }; 474 475 /* 476 * Channel information. 477 */ 478 struct ch_info { 479 union { 480 uint64_t cinfo_ch_id_64[2]; 481 uint32_t cinfo_ch_id_32[4]; 482 uuid_t cinfo_ch_id; /* Channel UUID */ 483 }; 484 #ifdef KERNEL 485 #define cinfo_ch_token cinfo_ch_id_32[0] 486 #endif /* KERNEL */ 487 uint32_t cinfo_ch_mode; /* CHMODE_* flags */ 488 ring_id_t cinfo_ch_ring_id; /* Channel ring (or any) */ 489 struct nxprov_params cinfo_nxprov_params; /* Nexus provider params */ 490 uuid_t cinfo_nx_uuid; /* Nexus instance UUID */ 491 nexus_port_t cinfo_nx_port; /* Nexus instance port */ 492 uint32_t cinfo_num_bufs; /* # buffers in user pool */ 493 mach_vm_size_t cinfo_mem_map_size; /* size of VM map */ 494 mach_vm_address_t cinfo_mem_base; /* VM mapping for task */ 495 mach_vm_offset_t cinfo_schema_offset; /* offset in VM map */ 496 ring_id_t cinfo_first_tx_ring; /* first TX ring ID */ 497 ring_id_t cinfo_last_tx_ring; /* last TX ring ID */ 498 ring_id_t cinfo_first_rx_ring; /* first RX ring ID */ 499 ring_id_t cinfo_last_rx_ring; /* last RX ring ID */ 500 struct ch_ev_thresh cinfo_tx_lowat; /* TX low-watermark */ 501 struct ch_ev_thresh cinfo_rx_lowat; /* RX low-watermark */ 502 } __attribute__((aligned(sizeof(uint64_t)))); 503 504 #include <skywalk/os_nexus_private.h> 505 506 #define CHANNEL_INIT_VERSION_1 1 507 #define CHANNEL_INIT_CURRENT_VERSION CHANNEL_INIT_VERSION_1 508 509 /* 510 * Channel init parameters. 511 */ 512 struct ch_init { 513 uint32_t ci_version; /* in: CHANNEL_INIT_CURRENT_VERSION */ 514 uint32_t ci_ch_mode; /* in: CHMODE_* flags */ 515 ring_id_t ci_ch_ring_id; /* in: Channel ring */ 516 nexus_port_t ci_nx_port; /* in: Nexus instance port */ 517 uuid_t ci_nx_uuid; /* in: Nexus instance UUID */ 518 user_addr_t ci_key; /* in: key blob */ 519 uint32_t ci_key_len; /* in: key length */ 520 uint32_t __ci_align; /* reserved */ 521 struct ch_ev_thresh ci_tx_lowat; /* in: TX low-watermark */ 522 struct ch_ev_thresh ci_rx_lowat; /* in: RX low-watermark */ 523 guardid_t ci_guard; /* out: guard ID */ 524 }; 525 526 #define CHMODE_UNUSED_1 0x00000001 527 #define CHMODE_UNUSED_2 0x00000002 528 #define CHMODE_UNUSED_3 0x00000004 529 #define CHMODE_USER_PACKET_POOL 0x00000008 530 #define CHMODE_DEFUNCT_OK 0x00000010 531 #define CHMODE_FILTER 0x00000020 /* packet filter channel */ 532 #define CHMODE_EVENT_RING 0x00000040 533 #define CHMODE_LOW_LATENCY 0x00000080 534 #define CHMODE_EXCLUSIVE 0x00000200 535 #ifdef KERNEL 536 /* mask off userland-settable bits */ 537 #define CHMODE_MASK \ 538 (CHMODE_USER_PACKET_POOL | CHMODE_FILTER | \ 539 CHMODE_DEFUNCT_OK | CHMODE_EVENT_RING | CHMODE_EXCLUSIVE | \ 540 CHMODE_LOW_LATENCY) 541 #define CHMODE_KERNEL 0x00001000 /* special, in-kernel */ 542 #define CHMODE_NO_NXREF 0x00002000 /* does not hold nx refcnt */ 543 #define CHMODE_CONFIG 0x00004000 /* provider config mode */ 544 #define CHMODE_HOST 0x00008000 /* to host (kernel) stack */ 545 546 #define CHMODE_BITS \ 547 "\020\01MON_TX\02MON_RX\03NO_COPY\04USER_PKT_POOL" \ 548 "\05DEFUNCT_OK\06FILTER\07EVENT_RING\010LOW_LATENCY\012EXCLUSIVE" \ 549 "\015KERNEL\016NO_NXREF\017CONFIG\020HOST" 550 #endif /* KERNEL */ 551 552 /* 553 * Channel options. 554 */ 555 #define CHOPT_TX_LOWAT_THRESH 1 /* (get/set) ch_ev_thresh */ 556 #define CHOPT_RX_LOWAT_THRESH 2 /* (get/set) ch_ev_thresh */ 557 #define CHOPT_IF_ADV_CONF 3 /* (set) enable/disable interface advisory events on the channel */ 558 559 #ifndef KERNEL 560 /* 561 * Channel ring descriptor. 562 */ 563 struct channel_ring_desc { 564 const struct channel *chrd_channel; 565 const volatile uint32_t *chrd_csm_flags; 566 const struct __user_channel_ring *chrd_ring; 567 568 /* 569 * Array of __slot_desc each representing slot-specific data. 570 * There is exactly one descriptor for each slot in the ring. 571 */ 572 struct __slot_desc *chrd_slot_desc; 573 574 /* local per-ring copies for easy access */ 575 const nexus_meta_type_t chrd_md_type; 576 const nexus_meta_subtype_t chrd_md_subtype; 577 const mach_vm_address_t chrd_shmem_base_addr; 578 const mach_vm_address_t chrd_def_buf_base_addr; 579 const mach_vm_address_t chrd_large_buf_base_addr; 580 const mach_vm_address_t chrd_md_base_addr; 581 const mach_vm_address_t chrd_sd_base_addr; 582 const mach_vm_address_t chrd_bft_base_addr; 583 const uint32_t chrd_max_bufs; /* max length of buflet chain */ 584 } __attribute__((aligned(sizeof(uint64_t)))); 585 586 /* 587 * Channel descriptor. 588 */ 589 struct channel { 590 int chd_fd; 591 sync_flags_t chd_sync_flags; 592 guardid_t chd_guard; 593 struct ch_info *chd_info; 594 595 const volatile struct __user_channel_schema *chd_schema; 596 const volatile void *chd_nx_stats; 597 const volatile struct __flowadv_entry *chd_nx_flowadv; 598 const volatile struct __kern_nexus_adv_metadata *chd_nx_adv; 599 600 const nexus_meta_type_t chd_md_type; 601 const nexus_meta_subtype_t chd_md_subtype; 602 const uint8_t chd_alloc_ring_idx; 603 const uint8_t chd_free_ring_idx; 604 const uint8_t chd_buf_alloc_ring_idx; 605 const uint8_t chd_buf_free_ring_idx; 606 const uint8_t chd_large_buf_alloc_ring_idx; 607 #if defined(LIBSYSCALL_INTERFACE) 608 #define CHD_RING_IDX_NONE (uint8_t)-1 609 #endif /* LIBSYSCALL_INTERFACE */ 610 611 /* 612 * Per-ring descriptor, aligned at max cache line boundary 613 */ 614 struct channel_ring_desc chd_rings[0] 615 __attribute__((aligned(sizeof(uint64_t)))); 616 }; 617 618 #define CHD_SIZE(n) \ 619 ((size_t)(&((struct channel *)0)->chd_rings[n])) 620 621 #define CHD_INFO_SIZE (sizeof (struct ch_info)) 622 #define CHD_INFO(_chd) ((_chd)->chd_info) 623 #define CHD_PARAMS(_chd) (&CHD_INFO(_chd)->cinfo_nxprov_params) 624 #define CHD_SCHEMA(_chd) \ 625 (__DECONST(struct __user_channel_schema *, (_chd)->chd_schema)) 626 #define CHD_NX_STATS(_chd) \ 627 (__DECONST(void *, (_chd)->chd_nx_stats)) 628 #define CHD_NX_FLOWADV(_chd) \ 629 (__DECONST(struct __flowadv_entry *, (_chd)->chd_nx_flowadv)) 630 #define CHD_NX_ADV_MD(_chd) __DECONST(struct __kern_nexus_adv_metadata *, \ 631 ((_chd)->chd_nx_adv)) 632 #define CHD_NX_ADV_NETIF(_adv_md) \ 633 (struct netif_nexus_advisory *)(void *)(_adv_md + 1) 634 #define CHD_NX_ADV_FSW(_adv_md) (struct sk_nexusadv *)(void *)(_adv_md + 1) 635 636 /* 637 * Channel attributes. 638 */ 639 struct channel_attr { 640 uint32_t cha_tx_rings; 641 uint32_t cha_rx_rings; 642 uint32_t cha_tx_slots; 643 uint32_t cha_rx_slots; 644 uint32_t cha_buf_size; 645 uint32_t cha_meta_size; 646 uint32_t cha_stats_size; 647 uint32_t cha_exclusive; 648 uint32_t cha_key_len; 649 void *cha_key; 650 struct ch_ev_thresh cha_tx_lowat; 651 struct ch_ev_thresh cha_rx_lowat; 652 uint32_t cha_nexus_type; 653 uint32_t cha_nexus_extensions; 654 uint32_t cha_nexus_mhints; 655 uint32_t cha_nexus_ifindex; 656 uint32_t cha_flowadv_max; 657 nexus_meta_type_t cha_nexus_meta_type; 658 nexus_meta_subtype_t cha_nexus_meta_subtype; 659 uint32_t cha_nexus_checksum_offload; 660 uint32_t cha_user_packet_pool; 661 uint32_t cha_nexusadv_size; 662 uint32_t cha_nexus_defunct_ok; 663 uint32_t cha_filter; 664 uint32_t cha_enable_event_ring; 665 uint32_t cha_max_frags; 666 uint32_t cha_num_buffers; 667 uint32_t cha_low_latency; 668 uint32_t cha_large_buf_size; 669 }; 670 671 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) 672 __BEGIN_DECLS 673 extern int __channel_open(struct ch_init *init, const uint32_t init_len); 674 extern int __channel_get_info(int c, struct ch_info *cinfo, 675 const uint32_t cinfolen); 676 extern int __channel_sync(int c, const int mode, const sync_flags_t flags); 677 extern int __channel_get_opt(int c, const uint32_t opt, void *aoptval, 678 uint32_t *aoptlen); 679 extern int __channel_set_opt(int c, const uint32_t opt, const void *aoptval, 680 const uint32_t optlen); 681 __END_DECLS 682 #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ 683 #endif /* !KERNEL */ 684 #endif /* PRIVATE || BSD_KERNEL_PRIVATE */ 685 #endif /* !_SKYWALK_OS_CHANNEL_PRIVATE_H_ */ 686