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sys/dev/mlx5/mlx5_en/mlx5_en_hw_tls_rx.c
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1 /*- 2 * Copyright (c) 2021-2022 NVIDIA corporation & affiliates. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #include "opt_kern_tls.h" 29 #include "opt_rss.h" 30 #include "opt_ratelimit.h" 31 32 #include <dev/mlx5/mlx5_en/en.h> 33 34 #include <dev/mlx5/tls.h> 35 36 #include <dev/mlx5/fs.h> 37 #include <dev/mlx5/mlx5_core/fs_tcp.h> 38 39 #include <sys/ktls.h> 40 #include <opencrypto/cryptodev.h> 41 42 #ifdef KERN_TLS 43 44 static if_snd_tag_free_t mlx5e_tls_rx_snd_tag_free; 45 static if_snd_tag_modify_t mlx5e_tls_rx_snd_tag_modify; 46 47 static const struct if_snd_tag_sw mlx5e_tls_rx_snd_tag_sw = { 48 .snd_tag_modify = mlx5e_tls_rx_snd_tag_modify, 49 .snd_tag_free = mlx5e_tls_rx_snd_tag_free, 50 .type = IF_SND_TAG_TYPE_TLS_RX 51 }; 52 53 MALLOC_DEFINE(M_MLX5E_TLS_RX, "MLX5E_TLS_RX", "MLX5 ethernet HW TLS RX"); 54 55 /* software TLS RX context */ 56 struct mlx5_ifc_sw_tls_rx_cntx_bits { 57 struct mlx5_ifc_tls_static_params_bits param; 58 struct mlx5_ifc_tls_progress_params_bits progress; 59 struct { 60 uint8_t key_data[8][0x20]; 61 uint8_t key_len[0x20]; 62 } key; 63 }; 64 65 CTASSERT(MLX5_ST_SZ_BYTES(sw_tls_rx_cntx) <= sizeof(((struct mlx5e_tls_rx_tag *)NULL)->crypto_params)); 66 CTASSERT(MLX5_ST_SZ_BYTES(mkc) == sizeof(((struct mlx5e_tx_umr_wqe *)NULL)->mkc)); 67 68 static const char *mlx5e_tls_rx_stats_desc[] = { 69 MLX5E_TLS_RX_STATS(MLX5E_STATS_DESC) 70 }; 71 72 static void mlx5e_tls_rx_work(struct work_struct *); 73 static bool mlx5e_tls_rx_snd_tag_find_tcp_sn_and_tls_rcd(struct mlx5e_tls_rx_tag *, 74 uint32_t, uint32_t *, uint64_t *); 75 76 CTASSERT((MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, param) % 16) == 0); 77 78 static uint32_t 79 mlx5e_tls_rx_get_ch(struct mlx5e_priv *priv, uint32_t flowid, uint32_t flowtype) 80 { 81 u32 ch; 82 #ifdef RSS 83 u32 temp; 84 #endif 85 86 /* keep this code synced with mlx5e_select_queue() */ 87 ch = priv->params.num_channels; 88 #ifdef RSS 89 if (rss_hash2bucket(flowid, flowtype, &temp) == 0) 90 ch = temp % ch; 91 else 92 #endif 93 ch = (flowid % 128) % ch; 94 return (ch); 95 } 96 97 /* 98 * This function gets a pointer to an internal queue, IQ, based on the 99 * provided "flowid" and "flowtype". The IQ returned may in some rare 100 * cases not be activated or running, but this is all handled by the 101 * "mlx5e_iq_get_producer_index()" function. 102 * 103 * The idea behind this function is to spread the IQ traffic as much 104 * as possible and to avoid congestion on the same IQ when processing 105 * RX traffic. 106 */ 107 static struct mlx5e_iq * 108 mlx5e_tls_rx_get_iq(struct mlx5e_priv *priv, uint32_t flowid, uint32_t flowtype) 109 { 110 /* 111 * NOTE: The channels array is only freed at detach 112 * and it safe to return a pointer to the send tag 113 * inside the channels structure as long as we 114 * reference the priv. 115 */ 116 return (&priv->channel[mlx5e_tls_rx_get_ch(priv, flowid, flowtype)].iq); 117 } 118 119 static void 120 mlx5e_tls_rx_send_static_parameters_cb(void *arg) 121 { 122 struct mlx5e_tls_rx_tag *ptag; 123 124 ptag = (struct mlx5e_tls_rx_tag *)arg; 125 126 m_snd_tag_rele(&ptag->tag); 127 } 128 129 /* 130 * This function sends the so-called TLS RX static parameters to the 131 * hardware. These parameters are temporarily stored in the 132 * "crypto_params" field of the TLS RX tag. Most importantly this 133 * function sets the TCP sequence number (32-bit) and TLS record 134 * number (64-bit) where the decryption can resume. 135 * 136 * Zero is returned upon success. Else some error happend. 137 */ 138 static int 139 mlx5e_tls_rx_send_static_parameters(struct mlx5e_iq *iq, struct mlx5e_tls_rx_tag *ptag) 140 { 141 const u32 ds_cnt = DIV_ROUND_UP(sizeof(struct mlx5e_tx_umr_wqe) + 142 MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, param), MLX5_SEND_WQE_DS); 143 struct mlx5e_tx_umr_wqe *wqe; 144 int pi; 145 146 mtx_lock(&iq->lock); 147 pi = mlx5e_iq_get_producer_index(iq); 148 if (pi < 0) { 149 mtx_unlock(&iq->lock); 150 return (-ENOMEM); 151 } 152 wqe = mlx5_wq_cyc_get_wqe(&iq->wq, pi); 153 154 memset(wqe, 0, sizeof(*wqe)); 155 156 wqe->ctrl.opmod_idx_opcode = cpu_to_be32((iq->pc << 8) | 157 MLX5_OPCODE_UMR | (MLX5_OPCODE_MOD_UMR_TLS_TIR_STATIC_PARAMS << 24)); 158 wqe->ctrl.qpn_ds = cpu_to_be32((iq->sqn << 8) | ds_cnt); 159 wqe->ctrl.imm = cpu_to_be32(ptag->tirn << 8); 160 wqe->ctrl.fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE | MLX5_FENCE_MODE_INITIATOR_SMALL; 161 162 /* fill out UMR control segment */ 163 wqe->umr.flags = 0x80; /* inline data */ 164 wqe->umr.bsf_octowords = 165 cpu_to_be16(MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, param) / 16); 166 167 /* copy in the static crypto parameters */ 168 memcpy(wqe + 1, MLX5_ADDR_OF(sw_tls_rx_cntx, ptag->crypto_params, param), 169 MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, param)); 170 171 /* copy data for doorbell */ 172 memcpy(iq->doorbell.d32, &wqe->ctrl, sizeof(iq->doorbell.d32)); 173 174 iq->data[pi].num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS); 175 iq->data[pi].callback = &mlx5e_tls_rx_send_static_parameters_cb; 176 iq->data[pi].arg = ptag; 177 178 m_snd_tag_ref(&ptag->tag); 179 180 iq->pc += iq->data[pi].num_wqebbs; 181 182 mlx5e_iq_notify_hw(iq); 183 184 mtx_unlock(&iq->lock); 185 186 return (0); /* success */ 187 } 188 189 static void 190 mlx5e_tls_rx_send_progress_parameters_cb(void *arg) 191 { 192 struct mlx5e_tls_rx_tag *ptag; 193 194 ptag = (struct mlx5e_tls_rx_tag *)arg; 195 196 complete(&ptag->progress_complete); 197 } 198 199 CTASSERT(MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, progress) == 200 sizeof(((struct mlx5e_tx_psv_wqe *)NULL)->psv)); 201 202 /* 203 * This function resets the state of the TIR context to start 204 * searching for a valid TLS header and is used only when allocating 205 * the TLS RX tag. 206 * 207 * Zero is returned upon success, else some error happened. 208 */ 209 static int 210 mlx5e_tls_rx_send_progress_parameters_sync(struct mlx5e_iq *iq, 211 struct mlx5e_tls_rx_tag *ptag) 212 { 213 const u32 ds_cnt = DIV_ROUND_UP(sizeof(struct mlx5e_tx_psv_wqe), 214 MLX5_SEND_WQE_DS); 215 struct mlx5e_priv *priv; 216 struct mlx5e_tx_psv_wqe *wqe; 217 int pi; 218 219 mtx_lock(&iq->lock); 220 pi = mlx5e_iq_get_producer_index(iq); 221 if (pi < 0) { 222 mtx_unlock(&iq->lock); 223 return (-ENOMEM); 224 } 225 wqe = mlx5_wq_cyc_get_wqe(&iq->wq, pi); 226 227 memset(wqe, 0, sizeof(*wqe)); 228 229 wqe->ctrl.opmod_idx_opcode = cpu_to_be32((iq->pc << 8) | 230 MLX5_OPCODE_SET_PSV | (MLX5_OPCODE_MOD_PSV_TLS_TIR_PROGRESS_PARAMS << 24)); 231 wqe->ctrl.qpn_ds = cpu_to_be32((iq->sqn << 8) | ds_cnt); 232 wqe->ctrl.fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE; 233 234 /* copy in the PSV control segment */ 235 memcpy(&wqe->psv, MLX5_ADDR_OF(sw_tls_rx_cntx, ptag->crypto_params, progress), 236 sizeof(wqe->psv)); 237 238 /* copy data for doorbell */ 239 memcpy(iq->doorbell.d32, &wqe->ctrl, sizeof(iq->doorbell.d32)); 240 241 iq->data[pi].num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS); 242 iq->data[pi].callback = &mlx5e_tls_rx_send_progress_parameters_cb; 243 iq->data[pi].arg = ptag; 244 245 iq->pc += iq->data[pi].num_wqebbs; 246 247 init_completion(&ptag->progress_complete); 248 249 mlx5e_iq_notify_hw(iq); 250 251 mtx_unlock(&iq->lock); 252 253 while (1) { 254 if (wait_for_completion_timeout(&ptag->progress_complete, hz) != 0) 255 break; 256 priv = container_of(iq, struct mlx5e_channel, iq)->priv; 257 if (priv->mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR || 258 pci_channel_offline(priv->mdev->pdev) != 0) 259 return (-EWOULDBLOCK); 260 } 261 262 return (0); /* success */ 263 } 264 265 CTASSERT(MLX5E_TLS_RX_PROGRESS_BUFFER_SIZE >= MLX5_ST_SZ_BYTES(tls_progress_params)); 266 CTASSERT(MLX5E_TLS_RX_PROGRESS_BUFFER_SIZE <= PAGE_SIZE); 267 268 struct mlx5e_get_tls_progress_params_wqe { 269 struct mlx5_wqe_ctrl_seg ctrl; 270 struct mlx5_seg_get_psv psv; 271 }; 272 273 static void 274 mlx5e_tls_rx_receive_progress_parameters_cb(void *arg) 275 { 276 struct mlx5e_tls_rx_tag *ptag; 277 struct mlx5e_iq *iq; 278 uint32_t tcp_curr_sn_he; 279 uint32_t tcp_next_sn_he; 280 uint64_t tls_rcd_num; 281 void *buffer; 282 283 ptag = (struct mlx5e_tls_rx_tag *)arg; 284 buffer = mlx5e_tls_rx_get_progress_buffer(ptag); 285 286 MLX5E_TLS_RX_TAG_LOCK(ptag); 287 288 ptag->tcp_resync_pending = 0; 289 290 switch (MLX5_GET(tls_progress_params, buffer, record_tracker_state)) { 291 case MLX5E_TLS_RX_PROGRESS_PARAMS_RECORD_TRACKER_STATE_TRACKING: 292 break; 293 default: 294 goto done; 295 } 296 297 switch (MLX5_GET(tls_progress_params, buffer, auth_state)) { 298 case MLX5E_TLS_RX_PROGRESS_PARAMS_AUTH_STATE_NO_OFFLOAD: 299 break; 300 default: 301 goto done; 302 } 303 304 tcp_curr_sn_he = MLX5_GET(tls_progress_params, buffer, hw_resync_tcp_sn); 305 306 if (mlx5e_tls_rx_snd_tag_find_tcp_sn_and_tls_rcd(ptag, tcp_curr_sn_he, 307 &tcp_next_sn_he, &tls_rcd_num)) { 308 309 MLX5_SET64(sw_tls_rx_cntx, ptag->crypto_params, 310 param.initial_record_number, tls_rcd_num); 311 MLX5_SET(sw_tls_rx_cntx, ptag->crypto_params, 312 param.resync_tcp_sn, tcp_curr_sn_he); 313 314 iq = mlx5e_tls_rx_get_iq( 315 container_of(ptag->tls_rx, struct mlx5e_priv, tls_rx), 316 ptag->flowid, ptag->flowtype); 317 318 if (mlx5e_tls_rx_send_static_parameters(iq, ptag) != 0) 319 MLX5E_TLS_RX_STAT_INC(ptag, rx_error, 1); 320 } 321 done: 322 MLX5E_TLS_RX_TAG_UNLOCK(ptag); 323 324 m_snd_tag_rele(&ptag->tag); 325 } 326 327 /* 328 * This function queries the hardware for the current state of the TIR 329 * in question. It is typically called when encrypted data is received 330 * to re-establish hardware decryption of received TLS data. 331 * 332 * Zero is returned upon success, else some error happened. 333 */ 334 static int 335 mlx5e_tls_rx_receive_progress_parameters(struct mlx5e_iq *iq, struct mlx5e_tls_rx_tag *ptag) 336 { 337 struct mlx5e_get_tls_progress_params_wqe *wqe; 338 const u32 ds_cnt = DIV_ROUND_UP(sizeof(*wqe), MLX5_SEND_WQE_DS); 339 u64 dma_address; 340 int pi; 341 342 mtx_lock(&iq->lock); 343 pi = mlx5e_iq_get_producer_index(iq); 344 if (pi < 0) { 345 mtx_unlock(&iq->lock); 346 return (-ENOMEM); 347 } 348 349 mlx5e_iq_load_memory_single(iq, pi, 350 mlx5e_tls_rx_get_progress_buffer(ptag), 351 MLX5E_TLS_RX_PROGRESS_BUFFER_SIZE, 352 &dma_address, BUS_DMASYNC_PREREAD); 353 354 wqe = mlx5_wq_cyc_get_wqe(&iq->wq, pi); 355 356 memset(wqe, 0, sizeof(*wqe)); 357 358 wqe->ctrl.opmod_idx_opcode = cpu_to_be32((iq->pc << 8) | 359 MLX5_OPCODE_GET_PSV | (MLX5_OPCODE_MOD_PSV_TLS_TIR_PROGRESS_PARAMS << 24)); 360 wqe->ctrl.qpn_ds = cpu_to_be32((iq->sqn << 8) | ds_cnt); 361 wqe->ctrl.fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE; 362 wqe->psv.num_psv = 1 << 4; 363 wqe->psv.l_key = iq->mkey_be; 364 wqe->psv.psv_index[0] = cpu_to_be32(ptag->tirn); 365 wqe->psv.va = cpu_to_be64(dma_address); 366 367 /* copy data for doorbell */ 368 memcpy(iq->doorbell.d32, &wqe->ctrl, sizeof(iq->doorbell.d32)); 369 370 iq->data[pi].num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS); 371 iq->data[pi].callback = &mlx5e_tls_rx_receive_progress_parameters_cb; 372 iq->data[pi].arg = ptag; 373 374 m_snd_tag_ref(&ptag->tag); 375 376 iq->pc += iq->data[pi].num_wqebbs; 377 378 mlx5e_iq_notify_hw(iq); 379 380 mtx_unlock(&iq->lock); 381 382 return (0); /* success */ 383 } 384 385 /* 386 * This is the import function for TLS RX tags. 387 */ 388 static int 389 mlx5e_tls_rx_tag_import(void *arg, void **store, int cnt, int domain, int flags) 390 { 391 struct mlx5e_tls_rx_tag *ptag; 392 int i; 393 394 for (i = 0; i != cnt; i++) { 395 ptag = malloc_domainset(sizeof(*ptag), M_MLX5E_TLS_RX, 396 mlx5_dev_domainset(arg), flags | M_ZERO); 397 mtx_init(&ptag->mtx, "mlx5-tls-rx-tag-mtx", NULL, MTX_DEF); 398 INIT_WORK(&ptag->work, mlx5e_tls_rx_work); 399 store[i] = ptag; 400 } 401 return (i); 402 } 403 404 /* 405 * This is the release function for TLS RX tags. 406 */ 407 static void 408 mlx5e_tls_rx_tag_release(void *arg, void **store, int cnt) 409 { 410 struct mlx5e_tls_rx_tag *ptag; 411 int i; 412 413 for (i = 0; i != cnt; i++) { 414 ptag = store[i]; 415 416 flush_work(&ptag->work); 417 mtx_destroy(&ptag->mtx); 418 free(ptag, M_MLX5E_TLS_RX); 419 } 420 } 421 422 /* 423 * This is a convenience function to free TLS RX tags. It resets some 424 * selected fields, updates the number of resources and returns the 425 * TLS RX tag to the UMA pool of free tags. 426 */ 427 static void 428 mlx5e_tls_rx_tag_zfree(struct mlx5e_tls_rx_tag *ptag) 429 { 430 /* make sure any unhandled taskqueue events are ignored */ 431 ptag->state = MLX5E_TLS_RX_ST_FREED; 432 433 /* reset some variables */ 434 ptag->dek_index = 0; 435 ptag->dek_index_ok = 0; 436 ptag->tirn = 0; 437 ptag->flow_rule = NULL; 438 ptag->tcp_resync_active = 0; 439 ptag->tcp_resync_pending = 0; 440 441 /* avoid leaking keys */ 442 memset(ptag->crypto_params, 0, sizeof(ptag->crypto_params)); 443 444 /* update number of resources in use */ 445 atomic_add_32(&ptag->tls_rx->num_resources, -1U); 446 447 /* return tag to UMA */ 448 uma_zfree(ptag->tls_rx->zone, ptag); 449 } 450 451 /* 452 * This function enables TLS RX support for the given NIC, if all 453 * needed firmware capabilites are present. 454 */ 455 int 456 mlx5e_tls_rx_init(struct mlx5e_priv *priv) 457 { 458 struct mlx5e_tls_rx *ptls = &priv->tls_rx; 459 struct sysctl_oid *node; 460 uint32_t x; 461 462 if (MLX5_CAP_GEN(priv->mdev, tls_rx) == 0 || 463 MLX5_CAP_GEN(priv->mdev, log_max_dek) == 0 || 464 MLX5_CAP_FLOWTABLE_NIC_RX(priv->mdev, ft_field_support.outer_ip_version) == 0) 465 return (0); 466 467 ptls->wq = create_singlethread_workqueue("mlx5-tls-rx-wq"); 468 if (ptls->wq == NULL) 469 return (ENOMEM); 470 471 sysctl_ctx_init(&ptls->ctx); 472 473 snprintf(ptls->zname, sizeof(ptls->zname), 474 "mlx5_%u_tls_rx", device_get_unit(priv->mdev->pdev->dev.bsddev)); 475 476 ptls->zone = uma_zcache_create(ptls->zname, 477 sizeof(struct mlx5e_tls_rx_tag), NULL, NULL, NULL, NULL, 478 mlx5e_tls_rx_tag_import, mlx5e_tls_rx_tag_release, priv->mdev, 479 UMA_ZONE_UNMANAGED); 480 481 /* shared between RX and TX TLS */ 482 ptls->max_resources = 1U << (MLX5_CAP_GEN(priv->mdev, log_max_dek) - 1); 483 484 for (x = 0; x != MLX5E_TLS_RX_STATS_NUM; x++) 485 ptls->stats.arg[x] = counter_u64_alloc(M_WAITOK); 486 487 ptls->init = 1; 488 489 node = SYSCTL_ADD_NODE(&priv->sysctl_ctx, 490 SYSCTL_CHILDREN(priv->sysctl_ifnet), OID_AUTO, 491 "tls_rx", CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, "Hardware TLS receive offload"); 492 if (node == NULL) 493 return (0); 494 495 mlx5e_create_counter_stats(&ptls->ctx, 496 SYSCTL_CHILDREN(node), "stats", 497 mlx5e_tls_rx_stats_desc, MLX5E_TLS_RX_STATS_NUM, 498 ptls->stats.arg); 499 500 return (0); 501 } 502 503 /* 504 * This function disables TLS RX support for the given NIC. 505 */ 506 void 507 mlx5e_tls_rx_cleanup(struct mlx5e_priv *priv) 508 { 509 struct mlx5e_tls_rx *ptls = &priv->tls_rx; 510 uint32_t x; 511 512 if (ptls->init == 0) 513 return; 514 515 ptls->init = 0; 516 flush_workqueue(ptls->wq); 517 sysctl_ctx_free(&ptls->ctx); 518 uma_zdestroy(ptls->zone); 519 destroy_workqueue(ptls->wq); 520 521 /* check if all resources are freed */ 522 MPASS(priv->tls_rx.num_resources == 0); 523 524 for (x = 0; x != MLX5E_TLS_RX_STATS_NUM; x++) 525 counter_u64_free(ptls->stats.arg[x]); 526 } 527 528 /* 529 * This function is used to serialize sleeping firmware operations 530 * needed in order to establish and destroy a TLS RX tag. 531 */ 532 static void 533 mlx5e_tls_rx_work(struct work_struct *work) 534 { 535 struct mlx5e_tls_rx_tag *ptag; 536 struct mlx5e_priv *priv; 537 int err; 538 539 ptag = container_of(work, struct mlx5e_tls_rx_tag, work); 540 priv = container_of(ptag->tls_rx, struct mlx5e_priv, tls_rx); 541 542 switch (ptag->state) { 543 case MLX5E_TLS_RX_ST_INIT: 544 /* try to allocate new TIR context */ 545 err = mlx5_tls_open_tir(priv->mdev, priv->tdn, 546 priv->channel[mlx5e_tls_rx_get_ch(priv, ptag->flowid, ptag->flowtype)].rqtn, 547 &ptag->tirn); 548 if (err) { 549 MLX5E_TLS_RX_STAT_INC(ptag, rx_error, 1); 550 break; 551 } 552 MLX5_SET(sw_tls_rx_cntx, ptag->crypto_params, progress.pd, ptag->tirn); 553 554 /* try to allocate a DEK context ID */ 555 err = mlx5_encryption_key_create(priv->mdev, priv->pdn, 556 MLX5_ADDR_OF(sw_tls_rx_cntx, ptag->crypto_params, key.key_data), 557 MLX5_GET(sw_tls_rx_cntx, ptag->crypto_params, key.key_len), 558 &ptag->dek_index); 559 if (err) { 560 MLX5E_TLS_RX_STAT_INC(ptag, rx_error, 1); 561 break; 562 } 563 564 MLX5_SET(sw_tls_rx_cntx, ptag->crypto_params, param.dek_index, ptag->dek_index); 565 566 ptag->dek_index_ok = 1; 567 568 MLX5E_TLS_RX_TAG_LOCK(ptag); 569 if (ptag->state == MLX5E_TLS_RX_ST_INIT) 570 ptag->state = MLX5E_TLS_RX_ST_SETUP; 571 MLX5E_TLS_RX_TAG_UNLOCK(ptag); 572 break; 573 574 case MLX5E_TLS_RX_ST_RELEASE: 575 /* remove flow rule for incoming traffic, if any */ 576 if (ptag->flow_rule != NULL) 577 mlx5e_accel_fs_del_inpcb(ptag->flow_rule); 578 579 /* try to destroy DEK context by ID */ 580 if (ptag->dek_index_ok) 581 mlx5_encryption_key_destroy(priv->mdev, ptag->dek_index); 582 583 /* try to destroy TIR context by ID */ 584 if (ptag->tirn != 0) 585 mlx5_tls_close_tir(priv->mdev, ptag->tirn); 586 587 /* free tag */ 588 mlx5e_tls_rx_tag_zfree(ptag); 589 break; 590 591 default: 592 break; 593 } 594 } 595 596 /* 597 * This function translates the crypto parameters into the format used 598 * by the firmware and hardware. Currently only AES-128 and AES-256 is 599 * supported for TLS v1.2 and TLS v1.3. 600 * 601 * Returns zero on success, else an error happened. 602 */ 603 static int 604 mlx5e_tls_rx_set_params(void *ctx, struct inpcb *inp, const struct tls_session_params *en) 605 { 606 uint32_t tcp_sn_he; 607 uint64_t tls_sn_he; 608 609 MLX5_SET(sw_tls_rx_cntx, ctx, param.const_2, 2); 610 if (en->tls_vminor == TLS_MINOR_VER_TWO) 611 MLX5_SET(sw_tls_rx_cntx, ctx, param.tls_version, 2); /* v1.2 */ 612 else 613 MLX5_SET(sw_tls_rx_cntx, ctx, param.tls_version, 3); /* v1.3 */ 614 MLX5_SET(sw_tls_rx_cntx, ctx, param.const_1, 1); 615 MLX5_SET(sw_tls_rx_cntx, ctx, param.encryption_standard, 1); /* TLS */ 616 617 /* copy the initial vector in place */ 618 switch (en->iv_len) { 619 case MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, param.gcm_iv): 620 case MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, param.gcm_iv) + 621 MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, param.implicit_iv): 622 memcpy(MLX5_ADDR_OF(sw_tls_rx_cntx, ctx, param.gcm_iv), 623 en->iv, en->iv_len); 624 break; 625 default: 626 return (EINVAL); 627 } 628 629 if (en->cipher_key_len <= MLX5_FLD_SZ_BYTES(sw_tls_rx_cntx, key.key_data)) { 630 memcpy(MLX5_ADDR_OF(sw_tls_rx_cntx, ctx, key.key_data), 631 en->cipher_key, en->cipher_key_len); 632 MLX5_SET(sw_tls_rx_cntx, ctx, key.key_len, en->cipher_key_len); 633 } else { 634 return (EINVAL); 635 } 636 637 if (__predict_false(inp == NULL || 638 ktls_get_rx_sequence(inp, &tcp_sn_he, &tls_sn_he) != 0)) 639 return (EINVAL); 640 641 MLX5_SET64(sw_tls_rx_cntx, ctx, param.initial_record_number, tls_sn_he); 642 MLX5_SET(sw_tls_rx_cntx, ctx, param.resync_tcp_sn, tcp_sn_he); 643 644 return (0); 645 } 646 647 /* Verify zero default */ 648 CTASSERT(MLX5E_TLS_RX_ST_INIT == 0); 649 650 /* 651 * This function is responsible for allocating a TLS RX tag. It is a 652 * callback function invoked by the network stack. 653 * 654 * Returns zero on success else an error happened. 655 */ 656 int 657 mlx5e_tls_rx_snd_tag_alloc(struct ifnet *ifp, 658 union if_snd_tag_alloc_params *params, 659 struct m_snd_tag **ppmt) 660 { 661 struct mlx5e_iq *iq; 662 struct mlx5e_priv *priv; 663 struct mlx5e_tls_rx_tag *ptag; 664 struct mlx5_flow_rule *flow_rule; 665 const struct tls_session_params *en; 666 uint32_t value; 667 int error; 668 669 priv = ifp->if_softc; 670 671 if (unlikely(priv->gone != 0 || priv->tls_rx.init == 0 || 672 params->hdr.flowtype == M_HASHTYPE_NONE)) 673 return (EOPNOTSUPP); 674 675 /* allocate new tag from zone, if any */ 676 ptag = uma_zalloc(priv->tls_rx.zone, M_NOWAIT); 677 if (ptag == NULL) 678 return (ENOMEM); 679 680 /* sanity check default values */ 681 MPASS(ptag->dek_index == 0); 682 MPASS(ptag->dek_index_ok == 0); 683 684 /* setup TLS RX tag */ 685 ptag->tls_rx = &priv->tls_rx; 686 ptag->flowtype = params->hdr.flowtype; 687 ptag->flowid = params->hdr.flowid; 688 689 value = atomic_fetchadd_32(&priv->tls_rx.num_resources, 1U); 690 691 /* check resource limits */ 692 if (value >= priv->tls_rx.max_resources) { 693 error = ENOMEM; 694 goto failure; 695 } 696 697 en = ¶ms->tls_rx.tls->params; 698 699 /* only TLS v1.2 and v1.3 is currently supported */ 700 if (en->tls_vmajor != TLS_MAJOR_VER_ONE || 701 (en->tls_vminor != TLS_MINOR_VER_TWO 702 #ifdef TLS_MINOR_VER_THREE 703 && en->tls_vminor != TLS_MINOR_VER_THREE 704 #endif 705 )) { 706 error = EPROTONOSUPPORT; 707 goto failure; 708 } 709 710 switch (en->cipher_algorithm) { 711 case CRYPTO_AES_NIST_GCM_16: 712 switch (en->cipher_key_len) { 713 case 128 / 8: 714 if (en->tls_vminor == TLS_MINOR_VER_TWO) { 715 if (MLX5_CAP_TLS(priv->mdev, tls_1_2_aes_gcm_128) == 0) { 716 error = EPROTONOSUPPORT; 717 goto failure; 718 } 719 } else { 720 if (MLX5_CAP_TLS(priv->mdev, tls_1_3_aes_gcm_128) == 0) { 721 error = EPROTONOSUPPORT; 722 goto failure; 723 } 724 } 725 error = mlx5e_tls_rx_set_params( 726 ptag->crypto_params, params->tls_rx.inp, en); 727 if (error) 728 goto failure; 729 break; 730 731 case 256 / 8: 732 if (en->tls_vminor == TLS_MINOR_VER_TWO) { 733 if (MLX5_CAP_TLS(priv->mdev, tls_1_2_aes_gcm_256) == 0) { 734 error = EPROTONOSUPPORT; 735 goto failure; 736 } 737 } else { 738 if (MLX5_CAP_TLS(priv->mdev, tls_1_3_aes_gcm_256) == 0) { 739 error = EPROTONOSUPPORT; 740 goto failure; 741 } 742 } 743 error = mlx5e_tls_rx_set_params( 744 ptag->crypto_params, params->tls_rx.inp, en); 745 if (error) 746 goto failure; 747 break; 748 749 default: 750 error = EINVAL; 751 goto failure; 752 } 753 break; 754 default: 755 error = EPROTONOSUPPORT; 756 goto failure; 757 } 758 759 /* store pointer to mbuf tag */ 760 MPASS(ptag->tag.refcount == 0); 761 m_snd_tag_init(&ptag->tag, ifp, &mlx5e_tls_rx_snd_tag_sw); 762 *ppmt = &ptag->tag; 763 764 /* reset state */ 765 ptag->state = MLX5E_TLS_RX_ST_INIT; 766 767 queue_work(priv->tls_rx.wq, &ptag->work); 768 flush_work(&ptag->work); 769 770 /* check that worker task completed successfully */ 771 MLX5E_TLS_RX_TAG_LOCK(ptag); 772 if (ptag->state == MLX5E_TLS_RX_ST_SETUP) { 773 ptag->state = MLX5E_TLS_RX_ST_READY; 774 error = 0; 775 } else { 776 error = ENOMEM; 777 } 778 MLX5E_TLS_RX_TAG_UNLOCK(ptag); 779 780 if (unlikely(error)) 781 goto cleanup; 782 783 iq = mlx5e_tls_rx_get_iq(priv, ptag->flowid, ptag->flowtype); 784 785 /* establish connection between DEK and TIR */ 786 if (mlx5e_tls_rx_send_static_parameters(iq, ptag) != 0) { 787 MLX5E_TLS_RX_STAT_INC(ptag, rx_error, 1); 788 error = ENOMEM; 789 goto cleanup; 790 } 791 792 MLX5_SET(sw_tls_rx_cntx, ptag->crypto_params, progress.auth_state, 793 MLX5E_TLS_RX_PROGRESS_PARAMS_AUTH_STATE_NO_OFFLOAD); 794 MLX5_SET(sw_tls_rx_cntx, ptag->crypto_params, progress.record_tracker_state, 795 MLX5E_TLS_RX_PROGRESS_PARAMS_RECORD_TRACKER_STATE_START); 796 797 /* reset state to all zeros */ 798 if (mlx5e_tls_rx_send_progress_parameters_sync(iq, ptag) != 0) { 799 MLX5E_TLS_RX_STAT_INC(ptag, rx_error, 1); 800 error = ENOMEM; 801 goto cleanup; 802 } 803 804 if (ifp->if_pcp != IFNET_PCP_NONE || params->tls_rx.vlan_id != 0) { 805 /* create flow rule for TLS RX traffic (tagged) */ 806 flow_rule = mlx5e_accel_fs_add_inpcb(priv, params->tls_rx.inp, 807 ptag->tirn, MLX5_FS_DEFAULT_FLOW_TAG, params->tls_rx.vlan_id); 808 } else { 809 /* create flow rule for TLS RX traffic (untagged) */ 810 flow_rule = mlx5e_accel_fs_add_inpcb(priv, params->tls_rx.inp, 811 ptag->tirn, MLX5_FS_DEFAULT_FLOW_TAG, MLX5E_ACCEL_FS_ADD_INPCB_NO_VLAN); 812 } 813 814 if (IS_ERR_OR_NULL(flow_rule)) { 815 MLX5E_TLS_RX_STAT_INC(ptag, rx_error, 1); 816 error = ENOMEM; 817 goto cleanup; 818 } 819 820 ptag->flow_rule = flow_rule; 821 822 return (0); 823 824 cleanup: 825 m_snd_tag_rele(&ptag->tag); 826 return (error); 827 828 failure: 829 mlx5e_tls_rx_tag_zfree(ptag); 830 return (error); 831 } 832 833 834 /* 835 * This function adds the TCP sequence number and TLS record number in 836 * host endian format to a small database. When TLS records have the 837 * same length, they are simply accumulated by counting instead of 838 * separated entries in the TLS database. The dimension of the 839 * database is such that it cannot store more than 1GByte of 840 * continuous TCP data to avoid issues with TCP sequence number wrap 841 * around. A record length of zero bytes has special meaning and means 842 * that resync completed and all data in the database can be 843 * discarded. This function is called after the TCP stack has 844 * re-assembled all TCP fragments due to out of order packet reception 845 * and all TCP sequence numbers should be sequential. 846 * 847 * This function returns true if a so-called TLS RX resync operation 848 * is in progress. Else no such operation is in progress. 849 */ 850 static bool 851 mlx5e_tls_rx_snd_tag_add_tcp_sequence(struct mlx5e_tls_rx_tag *ptag, 852 uint32_t tcp_sn_he, uint32_t len, uint64_t tls_rcd) 853 { 854 uint16_t i, j, n; 855 856 if (ptag->tcp_resync_active == 0 || 857 ptag->tcp_resync_next != tcp_sn_he || 858 len == 0) { 859 /* start over again or terminate */ 860 ptag->tcp_resync_active = (len != 0); 861 ptag->tcp_resync_len[0] = len; 862 ptag->tcp_resync_num[0] = 1; 863 ptag->tcp_resync_pc = (len != 0); 864 ptag->tcp_resync_cc = 0; 865 ptag->tcp_resync_start = tcp_sn_he; 866 ptag->rcd_resync_start = tls_rcd; 867 } else { 868 i = (ptag->tcp_resync_pc - 1) & (MLX5E_TLS_RX_RESYNC_MAX - 1); 869 n = ptag->tcp_resync_pc - ptag->tcp_resync_cc; 870 871 /* check if same length like last time */ 872 if (ptag->tcp_resync_len[i] == len && 873 ptag->tcp_resync_num[i] != MLX5E_TLS_RX_NUM_MAX) { 874 /* use existing entry */ 875 ptag->tcp_resync_num[i]++; 876 } else if (n == MLX5E_TLS_RX_RESYNC_MAX) { 877 j = ptag->tcp_resync_cc++ & (MLX5E_TLS_RX_RESYNC_MAX - 1); 878 /* adjust starting TCP sequence number */ 879 ptag->rcd_resync_start += ptag->tcp_resync_num[j]; 880 ptag->tcp_resync_start += ptag->tcp_resync_len[j] * ptag->tcp_resync_num[j]; 881 i = ptag->tcp_resync_pc++ & (MLX5E_TLS_RX_RESYNC_MAX - 1); 882 /* store new entry */ 883 ptag->tcp_resync_len[i] = len; 884 ptag->tcp_resync_num[i] = 1; 885 } else { 886 i = ptag->tcp_resync_pc++ & (MLX5E_TLS_RX_RESYNC_MAX - 1); 887 /* add new entry */ 888 ptag->tcp_resync_len[i] = len; 889 ptag->tcp_resync_num[i] = 1; 890 } 891 } 892 893 /* store next TCP SN in host endian format */ 894 ptag->tcp_resync_next = tcp_sn_he + len; 895 896 return (ptag->tcp_resync_active); 897 } 898 899 /* 900 * This function checks if the given TCP sequence number points to the 901 * beginning of a valid TLS header. 902 * 903 * Returns true if a match is found. Else false. 904 */ 905 static bool 906 mlx5e_tls_rx_snd_tag_find_tcp_sn_and_tls_rcd(struct mlx5e_tls_rx_tag *ptag, 907 uint32_t tcp_sn_he, uint32_t *p_next_tcp_sn_he, uint64_t *p_tls_rcd) 908 { 909 uint16_t i, j; 910 uint32_t off = 0; 911 uint32_t rcd = 0; 912 uint32_t delta; 913 uint32_t leap; 914 915 for (i = ptag->tcp_resync_cc; i != ptag->tcp_resync_pc; i++) { 916 delta = tcp_sn_he - off - ptag->tcp_resync_start; 917 918 /* check if subtraction went negative */ 919 if ((int32_t)delta < 0) 920 break; 921 922 j = i & (MLX5E_TLS_RX_RESYNC_MAX - 1); 923 leap = ptag->tcp_resync_len[j] * ptag->tcp_resync_num[j]; 924 if (delta < leap) { 925 if ((delta % ptag->tcp_resync_len[j]) == 0) { 926 *p_next_tcp_sn_he = tcp_sn_he + 927 ptag->tcp_resync_len[j]; 928 *p_tls_rcd = ptag->rcd_resync_start + 929 (uint64_t)rcd + 930 (uint64_t)(delta / ptag->tcp_resync_len[j]); 931 return (true); /* success */ 932 } 933 break; /* invalid offset */ 934 } 935 rcd += ptag->tcp_resync_num[j]; 936 off += leap; 937 } 938 return (false); /* not found */ 939 } 940 941 /* 942 * This is a callback function from the network stack to keep track of 943 * TLS RX TCP sequence numbers. 944 * 945 * Returns zero on success else an error happened. 946 */ 947 static int 948 mlx5e_tls_rx_snd_tag_modify(struct m_snd_tag *pmt, union if_snd_tag_modify_params *params) 949 { 950 struct mlx5e_tls_rx_tag *ptag; 951 struct mlx5e_priv *priv; 952 struct mlx5e_iq *iq; 953 int err; 954 955 ptag = container_of(pmt, struct mlx5e_tls_rx_tag, tag); 956 priv = container_of(ptag->tls_rx, struct mlx5e_priv, tls_rx); 957 958 if (unlikely(priv->gone != 0)) 959 return (ENXIO); 960 961 iq = mlx5e_tls_rx_get_iq(priv, ptag->flowid, ptag->flowtype); 962 963 MLX5E_TLS_RX_TAG_LOCK(ptag); 964 965 if (mlx5e_tls_rx_snd_tag_add_tcp_sequence(ptag, 966 params->tls_rx.tls_hdr_tcp_sn, 967 params->tls_rx.tls_rec_length, 968 params->tls_rx.tls_seq_number) && 969 ptag->tcp_resync_pending == 0) { 970 err = mlx5e_tls_rx_receive_progress_parameters(iq, ptag); 971 if (err != 0) { 972 MLX5E_TLS_RX_STAT_INC(ptag, rx_resync_err, 1); 973 } else { 974 ptag->tcp_resync_pending = 1; 975 MLX5E_TLS_RX_STAT_INC(ptag, rx_resync_ok, 1); 976 } 977 } else { 978 err = 0; 979 } 980 MLX5E_TLS_RX_TAG_UNLOCK(ptag); 981 982 return (-err); 983 } 984 985 /* 986 * This function frees a TLS RX tag in a non-blocking way. 987 */ 988 static void 989 mlx5e_tls_rx_snd_tag_free(struct m_snd_tag *pmt) 990 { 991 struct mlx5e_tls_rx_tag *ptag = 992 container_of(pmt, struct mlx5e_tls_rx_tag, tag); 993 struct mlx5e_priv *priv; 994 995 MLX5E_TLS_RX_TAG_LOCK(ptag); 996 ptag->state = MLX5E_TLS_RX_ST_RELEASE; 997 MLX5E_TLS_RX_TAG_UNLOCK(ptag); 998 999 priv = ptag->tag.ifp->if_softc; 1000 queue_work(priv->tls_rx.wq, &ptag->work); 1001 } 1002 1003 #else 1004 1005 int 1006 mlx5e_tls_rx_init(struct mlx5e_priv *priv) 1007 { 1008 1009 return (0); 1010 } 1011 1012 void 1013 mlx5e_tls_rx_cleanup(struct mlx5e_priv *priv) 1014 { 1015 /* NOP */ 1016 } 1017 1018 #endif
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