1 // SPDX-License-Identifier: GPL-2.0-only 2 /**************************************************************************** 3 * Driver for Solarflare network controllers and boards 4 * Copyright 2018 Solarflare Communications Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published 8 * by the Free Software Foundation, incorporated herein by reference. 9 */ 10 11 #include "net_driver.h" 12 #include <linux/module.h> 13 #include <linux/iommu.h> 14 #include "efx.h" 15 #include "nic.h" 16 #include "rx_common.h" 17 18 /* This is the percentage fill level below which new RX descriptors 19 * will be added to the RX descriptor ring. 20 */ 21 static unsigned int rx_refill_threshold; 22 module_param(rx_refill_threshold, uint, 0444); 23 MODULE_PARM_DESC(rx_refill_threshold, 24 "RX descriptor ring refill threshold (%)"); 25 26 /* Number of RX buffers to recycle pages for. When creating the RX page recycle 27 * ring, this number is divided by the number of buffers per page to calculate 28 * the number of pages to store in the RX page recycle ring. 29 */ 30 #define EFX_RECYCLE_RING_SIZE_IOMMU 4096 31 #define EFX_RECYCLE_RING_SIZE_NOIOMMU (2 * EFX_RX_PREFERRED_BATCH) 32 33 /* RX maximum head room required. 34 * 35 * This must be at least 1 to prevent overflow, plus one packet-worth 36 * to allow pipelined receives. 37 */ 38 #define EFX_RXD_HEAD_ROOM (1 + EFX_RX_MAX_FRAGS) 39 40 /* Check the RX page recycle ring for a page that can be reused. */ 41 static struct page *efx_reuse_page(struct efx_rx_queue *rx_queue) 42 { 43 struct efx_nic *efx = rx_queue->efx; 44 struct efx_rx_page_state *state; 45 unsigned int index; 46 struct page *page; 47 48 index = rx_queue->page_remove & rx_queue->page_ptr_mask; 49 page = rx_queue->page_ring[index]; 50 if (page == NULL) 51 return NULL; 52 53 rx_queue->page_ring[index] = NULL; 54 /* page_remove cannot exceed page_add. */ 55 if (rx_queue->page_remove != rx_queue->page_add) 56 ++rx_queue->page_remove; 57 58 /* If page_count is 1 then we hold the only reference to this page. */ 59 if (page_count(page) == 1) { 60 ++rx_queue->page_recycle_count; 61 return page; 62 } else { 63 state = page_address(page); 64 dma_unmap_page(&efx->pci_dev->dev, state->dma_addr, 65 PAGE_SIZE << efx->rx_buffer_order, 66 DMA_FROM_DEVICE); 67 put_page(page); 68 ++rx_queue->page_recycle_failed; 69 } 70 71 return NULL; 72 } 73 74 /* Attempt to recycle the page if there is an RX recycle ring; the page can 75 * only be added if this is the final RX buffer, to prevent pages being used in 76 * the descriptor ring and appearing in the recycle ring simultaneously. 77 */ 78 static void efx_recycle_rx_page(struct efx_channel *channel, 79 struct efx_rx_buffer *rx_buf) 80 { 81 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel); 82 struct efx_nic *efx = rx_queue->efx; 83 struct page *page = rx_buf->page; 84 unsigned int index; 85 86 /* Only recycle the page after processing the final buffer. */ 87 if (!(rx_buf->flags & EFX_RX_BUF_LAST_IN_PAGE)) 88 return; 89 90 index = rx_queue->page_add & rx_queue->page_ptr_mask; 91 if (rx_queue->page_ring[index] == NULL) { 92 unsigned int read_index = rx_queue->page_remove & 93 rx_queue->page_ptr_mask; 94 95 /* The next slot in the recycle ring is available, but 96 * increment page_remove if the read pointer currently 97 * points here. 98 */ 99 if (read_index == index) 100 ++rx_queue->page_remove; 101 rx_queue->page_ring[index] = page; 102 ++rx_queue->page_add; 103 return; 104 } 105 ++rx_queue->page_recycle_full; 106 efx_unmap_rx_buffer(efx, rx_buf); 107 put_page(rx_buf->page); 108 } 109 110 /* Recycle the pages that are used by buffers that have just been received. */ 111 void efx_recycle_rx_pages(struct efx_channel *channel, 112 struct efx_rx_buffer *rx_buf, 113 unsigned int n_frags) 114 { 115 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel); 116 117 do { 118 efx_recycle_rx_page(channel, rx_buf); 119 rx_buf = efx_rx_buf_next(rx_queue, rx_buf); 120 } while (--n_frags); 121 } 122 123 void efx_discard_rx_packet(struct efx_channel *channel, 124 struct efx_rx_buffer *rx_buf, 125 unsigned int n_frags) 126 { 127 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel); 128 129 efx_recycle_rx_pages(channel, rx_buf, n_frags); 130 131 efx_free_rx_buffers(rx_queue, rx_buf, n_frags); 132 } 133 134 static void efx_init_rx_recycle_ring(struct efx_rx_queue *rx_queue) 135 { 136 unsigned int bufs_in_recycle_ring, page_ring_size; 137 struct efx_nic *efx = rx_queue->efx; 138 139 /* Set the RX recycle ring size */ 140 #ifdef CONFIG_PPC64 141 bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_IOMMU; 142 #else 143 if (iommu_present(&pci_bus_type)) 144 bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_IOMMU; 145 else 146 bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_NOIOMMU; 147 #endif /* CONFIG_PPC64 */ 148 149 page_ring_size = roundup_pow_of_two(bufs_in_recycle_ring / 150 efx->rx_bufs_per_page); 151 rx_queue->page_ring = kcalloc(page_ring_size, 152 sizeof(*rx_queue->page_ring), GFP_KERNEL); 153 rx_queue->page_ptr_mask = page_ring_size - 1; 154 } 155 156 static void efx_fini_rx_recycle_ring(struct efx_rx_queue *rx_queue) 157 { 158 struct efx_nic *efx = rx_queue->efx; 159 int i; 160 161 /* Unmap and release the pages in the recycle ring. Remove the ring. */ 162 for (i = 0; i <= rx_queue->page_ptr_mask; i++) { 163 struct page *page = rx_queue->page_ring[i]; 164 struct efx_rx_page_state *state; 165 166 if (page == NULL) 167 continue; 168 169 state = page_address(page); 170 dma_unmap_page(&efx->pci_dev->dev, state->dma_addr, 171 PAGE_SIZE << efx->rx_buffer_order, 172 DMA_FROM_DEVICE); 173 put_page(page); 174 } 175 kfree(rx_queue->page_ring); 176 rx_queue->page_ring = NULL; 177 } 178 179 static void efx_fini_rx_buffer(struct efx_rx_queue *rx_queue, 180 struct efx_rx_buffer *rx_buf) 181 { 182 /* Release the page reference we hold for the buffer. */ 183 if (rx_buf->page) 184 put_page(rx_buf->page); 185 186 /* If this is the last buffer in a page, unmap and free it. */ 187 if (rx_buf->flags & EFX_RX_BUF_LAST_IN_PAGE) { 188 efx_unmap_rx_buffer(rx_queue->efx, rx_buf); 189 efx_free_rx_buffers(rx_queue, rx_buf, 1); 190 } 191 rx_buf->page = NULL; 192 } 193 194 int efx_probe_rx_queue(struct efx_rx_queue *rx_queue) 195 { 196 struct efx_nic *efx = rx_queue->efx; 197 unsigned int entries; 198 int rc; 199 200 /* Create the smallest power-of-two aligned ring */ 201 entries = max(roundup_pow_of_two(efx->rxq_entries), EFX_MIN_DMAQ_SIZE); 202 EFX_WARN_ON_PARANOID(entries > EFX_MAX_DMAQ_SIZE); 203 rx_queue->ptr_mask = entries - 1; 204 205 netif_dbg(efx, probe, efx->net_dev, 206 "creating RX queue %d size %#x mask %#x\n", 207 efx_rx_queue_index(rx_queue), efx->rxq_entries, 208 rx_queue->ptr_mask); 209 210 /* Allocate RX buffers */ 211 rx_queue->buffer = kcalloc(entries, sizeof(*rx_queue->buffer), 212 GFP_KERNEL); 213 if (!rx_queue->buffer) 214 return -ENOMEM; 215 216 rc = efx_nic_probe_rx(rx_queue); 217 if (rc) { 218 kfree(rx_queue->buffer); 219 rx_queue->buffer = NULL; 220 } 221 222 return rc; 223 } 224 225 void efx_init_rx_queue(struct efx_rx_queue *rx_queue) 226 { 227 unsigned int max_fill, trigger, max_trigger; 228 struct efx_nic *efx = rx_queue->efx; 229 int rc = 0; 230 231 netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev, 232 "initialising RX queue %d\n", efx_rx_queue_index(rx_queue)); 233 234 /* Initialise ptr fields */ 235 rx_queue->added_count = 0; 236 rx_queue->notified_count = 0; 237 rx_queue->removed_count = 0; 238 rx_queue->min_fill = -1U; 239 efx_init_rx_recycle_ring(rx_queue); 240 241 rx_queue->page_remove = 0; 242 rx_queue->page_add = rx_queue->page_ptr_mask + 1; 243 rx_queue->page_recycle_count = 0; 244 rx_queue->page_recycle_failed = 0; 245 rx_queue->page_recycle_full = 0; 246 247 /* Initialise limit fields */ 248 max_fill = efx->rxq_entries - EFX_RXD_HEAD_ROOM; 249 max_trigger = 250 max_fill - efx->rx_pages_per_batch * efx->rx_bufs_per_page; 251 if (rx_refill_threshold != 0) { 252 trigger = max_fill * min(rx_refill_threshold, 100U) / 100U; 253 if (trigger > max_trigger) 254 trigger = max_trigger; 255 } else { 256 trigger = max_trigger; 257 } 258 259 rx_queue->max_fill = max_fill; 260 rx_queue->fast_fill_trigger = trigger; 261 rx_queue->refill_enabled = true; 262 263 /* Initialise XDP queue information */ 264 rc = xdp_rxq_info_reg(&rx_queue->xdp_rxq_info, efx->net_dev, 265 rx_queue->core_index); 266 267 if (rc) { 268 netif_err(efx, rx_err, efx->net_dev, 269 "Failure to initialise XDP queue information rc=%d\n", 270 rc); 271 efx->xdp_rxq_info_failed = true; 272 } else { 273 rx_queue->xdp_rxq_info_valid = true; 274 } 275 276 /* Set up RX descriptor ring */ 277 efx_nic_init_rx(rx_queue); 278 } 279 280 void efx_fini_rx_queue(struct efx_rx_queue *rx_queue) 281 { 282 struct efx_rx_buffer *rx_buf; 283 int i; 284 285 netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev, 286 "shutting down RX queue %d\n", efx_rx_queue_index(rx_queue)); 287 288 del_timer_sync(&rx_queue->slow_fill); 289 290 /* Release RX buffers from the current read ptr to the write ptr */ 291 if (rx_queue->buffer) { 292 for (i = rx_queue->removed_count; i < rx_queue->added_count; 293 i++) { 294 unsigned int index = i & rx_queue->ptr_mask; 295 296 rx_buf = efx_rx_buffer(rx_queue, index); 297 efx_fini_rx_buffer(rx_queue, rx_buf); 298 } 299 } 300 301 efx_fini_rx_recycle_ring(rx_queue); 302 303 if (rx_queue->xdp_rxq_info_valid) 304 xdp_rxq_info_unreg(&rx_queue->xdp_rxq_info); 305 306 rx_queue->xdp_rxq_info_valid = false; 307 } 308 309 void efx_remove_rx_queue(struct efx_rx_queue *rx_queue) 310 { 311 netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev, 312 "destroying RX queue %d\n", efx_rx_queue_index(rx_queue)); 313 314 efx_nic_remove_rx(rx_queue); 315 316 kfree(rx_queue->buffer); 317 rx_queue->buffer = NULL; 318 } 319 320 /* Unmap a DMA-mapped page. This function is only called for the final RX 321 * buffer in a page. 322 */ 323 void efx_unmap_rx_buffer(struct efx_nic *efx, 324 struct efx_rx_buffer *rx_buf) 325 { 326 struct page *page = rx_buf->page; 327 328 if (page) { 329 struct efx_rx_page_state *state = page_address(page); 330 331 dma_unmap_page(&efx->pci_dev->dev, 332 state->dma_addr, 333 PAGE_SIZE << efx->rx_buffer_order, 334 DMA_FROM_DEVICE); 335 } 336 } 337 338 void efx_free_rx_buffers(struct efx_rx_queue *rx_queue, 339 struct efx_rx_buffer *rx_buf, 340 unsigned int num_bufs) 341 { 342 do { 343 if (rx_buf->page) { 344 put_page(rx_buf->page); 345 rx_buf->page = NULL; 346 } 347 rx_buf = efx_rx_buf_next(rx_queue, rx_buf); 348 } while (--num_bufs); 349 } 350 351 void efx_rx_slow_fill(struct timer_list *t) 352 { 353 struct efx_rx_queue *rx_queue = from_timer(rx_queue, t, slow_fill); 354 355 /* Post an event to cause NAPI to run and refill the queue */ 356 efx_nic_generate_fill_event(rx_queue); 357 ++rx_queue->slow_fill_count; 358 } 359 360 void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue) 361 { 362 mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(10)); 363 } 364 365 /* efx_init_rx_buffers - create EFX_RX_BATCH page-based RX buffers 366 * 367 * @rx_queue: Efx RX queue 368 * 369 * This allocates a batch of pages, maps them for DMA, and populates 370 * struct efx_rx_buffers for each one. Return a negative error code or 371 * 0 on success. If a single page can be used for multiple buffers, 372 * then the page will either be inserted fully, or not at all. 373 */ 374 static int efx_init_rx_buffers(struct efx_rx_queue *rx_queue, bool atomic) 375 { 376 unsigned int page_offset, index, count; 377 struct efx_nic *efx = rx_queue->efx; 378 struct efx_rx_page_state *state; 379 struct efx_rx_buffer *rx_buf; 380 dma_addr_t dma_addr; 381 struct page *page; 382 383 count = 0; 384 do { 385 page = efx_reuse_page(rx_queue); 386 if (page == NULL) { 387 page = alloc_pages(__GFP_COMP | 388 (atomic ? GFP_ATOMIC : GFP_KERNEL), 389 efx->rx_buffer_order); 390 if (unlikely(page == NULL)) 391 return -ENOMEM; 392 dma_addr = 393 dma_map_page(&efx->pci_dev->dev, page, 0, 394 PAGE_SIZE << efx->rx_buffer_order, 395 DMA_FROM_DEVICE); 396 if (unlikely(dma_mapping_error(&efx->pci_dev->dev, 397 dma_addr))) { 398 __free_pages(page, efx->rx_buffer_order); 399 return -EIO; 400 } 401 state = page_address(page); 402 state->dma_addr = dma_addr; 403 } else { 404 state = page_address(page); 405 dma_addr = state->dma_addr; 406 } 407 408 dma_addr += sizeof(struct efx_rx_page_state); 409 page_offset = sizeof(struct efx_rx_page_state); 410 411 do { 412 index = rx_queue->added_count & rx_queue->ptr_mask; 413 rx_buf = efx_rx_buffer(rx_queue, index); 414 rx_buf->dma_addr = dma_addr + efx->rx_ip_align + 415 EFX_XDP_HEADROOM; 416 rx_buf->page = page; 417 rx_buf->page_offset = page_offset + efx->rx_ip_align + 418 EFX_XDP_HEADROOM; 419 rx_buf->len = efx->rx_dma_len; 420 rx_buf->flags = 0; 421 ++rx_queue->added_count; 422 get_page(page); 423 dma_addr += efx->rx_page_buf_step; 424 page_offset += efx->rx_page_buf_step; 425 } while (page_offset + efx->rx_page_buf_step <= PAGE_SIZE); 426 427 rx_buf->flags = EFX_RX_BUF_LAST_IN_PAGE; 428 } while (++count < efx->rx_pages_per_batch); 429 430 return 0; 431 } 432 433 void efx_rx_config_page_split(struct efx_nic *efx) 434 { 435 efx->rx_page_buf_step = ALIGN(efx->rx_dma_len + efx->rx_ip_align + 436 EFX_XDP_HEADROOM + EFX_XDP_TAILROOM, 437 EFX_RX_BUF_ALIGNMENT); 438 efx->rx_bufs_per_page = efx->rx_buffer_order ? 1 : 439 ((PAGE_SIZE - sizeof(struct efx_rx_page_state)) / 440 efx->rx_page_buf_step); 441 efx->rx_buffer_truesize = (PAGE_SIZE << efx->rx_buffer_order) / 442 efx->rx_bufs_per_page; 443 efx->rx_pages_per_batch = DIV_ROUND_UP(EFX_RX_PREFERRED_BATCH, 444 efx->rx_bufs_per_page); 445 } 446 447 /* efx_fast_push_rx_descriptors - push new RX descriptors quickly 448 * @rx_queue: RX descriptor queue 449 * 450 * This will aim to fill the RX descriptor queue up to 451 * @rx_queue->@max_fill. If there is insufficient atomic 452 * memory to do so, a slow fill will be scheduled. 453 * 454 * The caller must provide serialisation (none is used here). In practise, 455 * this means this function must run from the NAPI handler, or be called 456 * when NAPI is disabled. 457 */ 458 void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic) 459 { 460 struct efx_nic *efx = rx_queue->efx; 461 unsigned int fill_level, batch_size; 462 int space, rc = 0; 463 464 if (!rx_queue->refill_enabled) 465 return; 466 467 /* Calculate current fill level, and exit if we don't need to fill */ 468 fill_level = (rx_queue->added_count - rx_queue->removed_count); 469 EFX_WARN_ON_ONCE_PARANOID(fill_level > rx_queue->efx->rxq_entries); 470 if (fill_level >= rx_queue->fast_fill_trigger) 471 goto out; 472 473 /* Record minimum fill level */ 474 if (unlikely(fill_level < rx_queue->min_fill)) { 475 if (fill_level) 476 rx_queue->min_fill = fill_level; 477 } 478 479 batch_size = efx->rx_pages_per_batch * efx->rx_bufs_per_page; 480 space = rx_queue->max_fill - fill_level; 481 EFX_WARN_ON_ONCE_PARANOID(space < batch_size); 482 483 netif_vdbg(rx_queue->efx, rx_status, rx_queue->efx->net_dev, 484 "RX queue %d fast-filling descriptor ring from" 485 " level %d to level %d\n", 486 efx_rx_queue_index(rx_queue), fill_level, 487 rx_queue->max_fill); 488 489 do { 490 rc = efx_init_rx_buffers(rx_queue, atomic); 491 if (unlikely(rc)) { 492 /* Ensure that we don't leave the rx queue empty */ 493 efx_schedule_slow_fill(rx_queue); 494 goto out; 495 } 496 } while ((space -= batch_size) >= batch_size); 497 498 netif_vdbg(rx_queue->efx, rx_status, rx_queue->efx->net_dev, 499 "RX queue %d fast-filled descriptor ring " 500 "to level %d\n", efx_rx_queue_index(rx_queue), 501 rx_queue->added_count - rx_queue->removed_count); 502 503 out: 504 if (rx_queue->notified_count != rx_queue->added_count) 505 efx_nic_notify_rx_desc(rx_queue); 506 } 507 508 /* Pass a received packet up through GRO. GRO can handle pages 509 * regardless of checksum state and skbs with a good checksum. 510 */ 511 void 512 efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf, 513 unsigned int n_frags, u8 *eh, __wsum csum) 514 { 515 struct napi_struct *napi = &channel->napi_str; 516 struct efx_nic *efx = channel->efx; 517 struct sk_buff *skb; 518 519 skb = napi_get_frags(napi); 520 if (unlikely(!skb)) { 521 struct efx_rx_queue *rx_queue; 522 523 rx_queue = efx_channel_get_rx_queue(channel); 524 efx_free_rx_buffers(rx_queue, rx_buf, n_frags); 525 return; 526 } 527 528 if (efx->net_dev->features & NETIF_F_RXHASH) 529 skb_set_hash(skb, efx_rx_buf_hash(efx, eh), 530 PKT_HASH_TYPE_L3); 531 if (csum) { 532 skb->csum = csum; 533 skb->ip_summed = CHECKSUM_COMPLETE; 534 } else { 535 skb->ip_summed = ((rx_buf->flags & EFX_RX_PKT_CSUMMED) ? 536 CHECKSUM_UNNECESSARY : CHECKSUM_NONE); 537 } 538 skb->csum_level = !!(rx_buf->flags & EFX_RX_PKT_CSUM_LEVEL); 539 540 for (;;) { 541 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, 542 rx_buf->page, rx_buf->page_offset, 543 rx_buf->len); 544 rx_buf->page = NULL; 545 skb->len += rx_buf->len; 546 if (skb_shinfo(skb)->nr_frags == n_frags) 547 break; 548 549 rx_buf = efx_rx_buf_next(&channel->rx_queue, rx_buf); 550 } 551 552 skb->data_len = skb->len; 553 skb->truesize += n_frags * efx->rx_buffer_truesize; 554 555 skb_record_rx_queue(skb, channel->rx_queue.core_index); 556 557 napi_gro_frags(napi); 558 } 559 560 /* RSS contexts. We're using linked lists and crappy O(n) algorithms, because 561 * (a) this is an infrequent control-plane operation and (b) n is small (max 64) 562 */ 563 struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx) 564 { 565 struct list_head *head = &efx->rss_context.list; 566 struct efx_rss_context *ctx, *new; 567 u32 id = 1; /* Don't use zero, that refers to the master RSS context */ 568 569 WARN_ON(!mutex_is_locked(&efx->rss_lock)); 570 571 /* Search for first gap in the numbering */ 572 list_for_each_entry(ctx, head, list) { 573 if (ctx->user_id != id) 574 break; 575 id++; 576 /* Check for wrap. If this happens, we have nearly 2^32 577 * allocated RSS contexts, which seems unlikely. 578 */ 579 if (WARN_ON_ONCE(!id)) 580 return NULL; 581 } 582 583 /* Create the new entry */ 584 new = kmalloc(sizeof(*new), GFP_KERNEL); 585 if (!new) 586 return NULL; 587 new->context_id = EFX_MCDI_RSS_CONTEXT_INVALID; 588 new->rx_hash_udp_4tuple = false; 589 590 /* Insert the new entry into the gap */ 591 new->user_id = id; 592 list_add_tail(&new->list, &ctx->list); 593 return new; 594 } 595 596 struct efx_rss_context *efx_find_rss_context_entry(struct efx_nic *efx, u32 id) 597 { 598 struct list_head *head = &efx->rss_context.list; 599 struct efx_rss_context *ctx; 600 601 WARN_ON(!mutex_is_locked(&efx->rss_lock)); 602 603 list_for_each_entry(ctx, head, list) 604 if (ctx->user_id == id) 605 return ctx; 606 return NULL; 607 } 608 609 void efx_free_rss_context_entry(struct efx_rss_context *ctx) 610 { 611 list_del(&ctx->list); 612 kfree(ctx); 613 } 614 615 void efx_set_default_rx_indir_table(struct efx_nic *efx, 616 struct efx_rss_context *ctx) 617 { 618 size_t i; 619 620 for (i = 0; i < ARRAY_SIZE(ctx->rx_indir_table); i++) 621 ctx->rx_indir_table[i] = 622 ethtool_rxfh_indir_default(i, efx->rss_spread); 623 } 624 625 /** 626 * efx_filter_is_mc_recipient - test whether spec is a multicast recipient 627 * @spec: Specification to test 628 * 629 * Return: %true if the specification is a non-drop RX filter that 630 * matches a local MAC address I/G bit value of 1 or matches a local 631 * IPv4 or IPv6 address value in the respective multicast address 632 * range. Otherwise %false. 633 */ 634 bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec) 635 { 636 if (!(spec->flags & EFX_FILTER_FLAG_RX) || 637 spec->dmaq_id == EFX_FILTER_RX_DMAQ_ID_DROP) 638 return false; 639 640 if (spec->match_flags & 641 (EFX_FILTER_MATCH_LOC_MAC | EFX_FILTER_MATCH_LOC_MAC_IG) && 642 is_multicast_ether_addr(spec->loc_mac)) 643 return true; 644 645 if ((spec->match_flags & 646 (EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_LOC_HOST)) == 647 (EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_LOC_HOST)) { 648 if (spec->ether_type == htons(ETH_P_IP) && 649 ipv4_is_multicast(spec->loc_host[0])) 650 return true; 651 if (spec->ether_type == htons(ETH_P_IPV6) && 652 ((const u8 *)spec->loc_host)[0] == 0xff) 653 return true; 654 } 655 656 return false; 657 } 658 659 bool efx_filter_spec_equal(const struct efx_filter_spec *left, 660 const struct efx_filter_spec *right) 661 { 662 if ((left->match_flags ^ right->match_flags) | 663 ((left->flags ^ right->flags) & 664 (EFX_FILTER_FLAG_RX | EFX_FILTER_FLAG_TX))) 665 return false; 666 667 return memcmp(&left->outer_vid, &right->outer_vid, 668 sizeof(struct efx_filter_spec) - 669 offsetof(struct efx_filter_spec, outer_vid)) == 0; 670 } 671 672 u32 efx_filter_spec_hash(const struct efx_filter_spec *spec) 673 { 674 BUILD_BUG_ON(offsetof(struct efx_filter_spec, outer_vid) & 3); 675 return jhash2((const u32 *)&spec->outer_vid, 676 (sizeof(struct efx_filter_spec) - 677 offsetof(struct efx_filter_spec, outer_vid)) / 4, 678 0); 679 } 680 681 #ifdef CONFIG_RFS_ACCEL 682 bool efx_rps_check_rule(struct efx_arfs_rule *rule, unsigned int filter_idx, 683 bool *force) 684 { 685 if (rule->filter_id == EFX_ARFS_FILTER_ID_PENDING) { 686 /* ARFS is currently updating this entry, leave it */ 687 return false; 688 } 689 if (rule->filter_id == EFX_ARFS_FILTER_ID_ERROR) { 690 /* ARFS tried and failed to update this, so it's probably out 691 * of date. Remove the filter and the ARFS rule entry. 692 */ 693 rule->filter_id = EFX_ARFS_FILTER_ID_REMOVING; 694 *force = true; 695 return true; 696 } else if (WARN_ON(rule->filter_id != filter_idx)) { /* can't happen */ 697 /* ARFS has moved on, so old filter is not needed. Since we did 698 * not mark the rule with EFX_ARFS_FILTER_ID_REMOVING, it will 699 * not be removed by efx_rps_hash_del() subsequently. 700 */ 701 *force = true; 702 return true; 703 } 704 /* Remove it iff ARFS wants to. */ 705 return true; 706 } 707 708 static 709 struct hlist_head *efx_rps_hash_bucket(struct efx_nic *efx, 710 const struct efx_filter_spec *spec) 711 { 712 u32 hash = efx_filter_spec_hash(spec); 713 714 lockdep_assert_held(&efx->rps_hash_lock); 715 if (!efx->rps_hash_table) 716 return NULL; 717 return &efx->rps_hash_table[hash % EFX_ARFS_HASH_TABLE_SIZE]; 718 } 719 720 struct efx_arfs_rule *efx_rps_hash_find(struct efx_nic *efx, 721 const struct efx_filter_spec *spec) 722 { 723 struct efx_arfs_rule *rule; 724 struct hlist_head *head; 725 struct hlist_node *node; 726 727 head = efx_rps_hash_bucket(efx, spec); 728 if (!head) 729 return NULL; 730 hlist_for_each(node, head) { 731 rule = container_of(node, struct efx_arfs_rule, node); 732 if (efx_filter_spec_equal(spec, &rule->spec)) 733 return rule; 734 } 735 return NULL; 736 } 737 738 struct efx_arfs_rule *efx_rps_hash_add(struct efx_nic *efx, 739 const struct efx_filter_spec *spec, 740 bool *new) 741 { 742 struct efx_arfs_rule *rule; 743 struct hlist_head *head; 744 struct hlist_node *node; 745 746 head = efx_rps_hash_bucket(efx, spec); 747 if (!head) 748 return NULL; 749 hlist_for_each(node, head) { 750 rule = container_of(node, struct efx_arfs_rule, node); 751 if (efx_filter_spec_equal(spec, &rule->spec)) { 752 *new = false; 753 return rule; 754 } 755 } 756 rule = kmalloc(sizeof(*rule), GFP_ATOMIC); 757 *new = true; 758 if (rule) { 759 memcpy(&rule->spec, spec, sizeof(rule->spec)); 760 hlist_add_head(&rule->node, head); 761 } 762 return rule; 763 } 764 765 void efx_rps_hash_del(struct efx_nic *efx, const struct efx_filter_spec *spec) 766 { 767 struct efx_arfs_rule *rule; 768 struct hlist_head *head; 769 struct hlist_node *node; 770 771 head = efx_rps_hash_bucket(efx, spec); 772 if (WARN_ON(!head)) 773 return; 774 hlist_for_each(node, head) { 775 rule = container_of(node, struct efx_arfs_rule, node); 776 if (efx_filter_spec_equal(spec, &rule->spec)) { 777 /* Someone already reused the entry. We know that if 778 * this check doesn't fire (i.e. filter_id == REMOVING) 779 * then the REMOVING mark was put there by our caller, 780 * because caller is holding a lock on filter table and 781 * only holders of that lock set REMOVING. 782 */ 783 if (rule->filter_id != EFX_ARFS_FILTER_ID_REMOVING) 784 return; 785 hlist_del(node); 786 kfree(rule); 787 return; 788 } 789 } 790 /* We didn't find it. */ 791 WARN_ON(1); 792 } 793 #endif 794 795 int efx_probe_filters(struct efx_nic *efx) 796 { 797 int rc; 798 799 init_rwsem(&efx->filter_sem); 800 mutex_lock(&efx->mac_lock); 801 down_write(&efx->filter_sem); 802 rc = efx->type->filter_table_probe(efx); 803 if (rc) 804 goto out_unlock; 805 806 #ifdef CONFIG_RFS_ACCEL 807 if (efx->type->offload_features & NETIF_F_NTUPLE) { 808 struct efx_channel *channel; 809 int i, success = 1; 810 811 efx_for_each_channel(channel, efx) { 812 channel->rps_flow_id = 813 kcalloc(efx->type->max_rx_ip_filters, 814 sizeof(*channel->rps_flow_id), 815 GFP_KERNEL); 816 if (!channel->rps_flow_id) 817 success = 0; 818 else 819 for (i = 0; 820 i < efx->type->max_rx_ip_filters; 821 ++i) 822 channel->rps_flow_id[i] = 823 RPS_FLOW_ID_INVALID; 824 channel->rfs_expire_index = 0; 825 channel->rfs_filter_count = 0; 826 } 827 828 if (!success) { 829 efx_for_each_channel(channel, efx) 830 kfree(channel->rps_flow_id); 831 efx->type->filter_table_remove(efx); 832 rc = -ENOMEM; 833 goto out_unlock; 834 } 835 } 836 #endif 837 out_unlock: 838 up_write(&efx->filter_sem); 839 mutex_unlock(&efx->mac_lock); 840 return rc; 841 } 842 843 void efx_remove_filters(struct efx_nic *efx) 844 { 845 #ifdef CONFIG_RFS_ACCEL 846 struct efx_channel *channel; 847 848 efx_for_each_channel(channel, efx) { 849 cancel_delayed_work_sync(&channel->filter_work); 850 kfree(channel->rps_flow_id); 851 } 852 #endif 853 down_write(&efx->filter_sem); 854 efx->type->filter_table_remove(efx); 855 up_write(&efx->filter_sem); 856 } 857 858 #ifdef CONFIG_RFS_ACCEL 859 860 static void efx_filter_rfs_work(struct work_struct *data) 861 { 862 struct efx_async_filter_insertion *req = container_of(data, struct efx_async_filter_insertion, 863 work); 864 struct efx_nic *efx = netdev_priv(req->net_dev); 865 struct efx_channel *channel = efx_get_channel(efx, req->rxq_index); 866 int slot_idx = req - efx->rps_slot; 867 struct efx_arfs_rule *rule; 868 u16 arfs_id = 0; 869 int rc; 870 871 rc = efx->type->filter_insert(efx, &req->spec, true); 872 if (rc >= 0) 873 /* Discard 'priority' part of EF10+ filter ID (mcdi_filters) */ 874 rc %= efx->type->max_rx_ip_filters; 875 if (efx->rps_hash_table) { 876 spin_lock_bh(&efx->rps_hash_lock); 877 rule = efx_rps_hash_find(efx, &req->spec); 878 /* The rule might have already gone, if someone else's request 879 * for the same spec was already worked and then expired before 880 * we got around to our work. In that case we have nothing 881 * tying us to an arfs_id, meaning that as soon as the filter 882 * is considered for expiry it will be removed. 883 */ 884 if (rule) { 885 if (rc < 0) 886 rule->filter_id = EFX_ARFS_FILTER_ID_ERROR; 887 else 888 rule->filter_id = rc; 889 arfs_id = rule->arfs_id; 890 } 891 spin_unlock_bh(&efx->rps_hash_lock); 892 } 893 if (rc >= 0) { 894 /* Remember this so we can check whether to expire the filter 895 * later. 896 */ 897 mutex_lock(&efx->rps_mutex); 898 if (channel->rps_flow_id[rc] == RPS_FLOW_ID_INVALID) 899 channel->rfs_filter_count++; 900 channel->rps_flow_id[rc] = req->flow_id; 901 mutex_unlock(&efx->rps_mutex); 902 903 if (req->spec.ether_type == htons(ETH_P_IP)) 904 netif_info(efx, rx_status, efx->net_dev, 905 "steering %s %pI4:%u:%pI4:%u to queue %u [flow %u filter %d id %u]\n", 906 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 907 req->spec.rem_host, ntohs(req->spec.rem_port), 908 req->spec.loc_host, ntohs(req->spec.loc_port), 909 req->rxq_index, req->flow_id, rc, arfs_id); 910 else 911 netif_info(efx, rx_status, efx->net_dev, 912 "steering %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u filter %d id %u]\n", 913 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 914 req->spec.rem_host, ntohs(req->spec.rem_port), 915 req->spec.loc_host, ntohs(req->spec.loc_port), 916 req->rxq_index, req->flow_id, rc, arfs_id); 917 channel->n_rfs_succeeded++; 918 } else { 919 if (req->spec.ether_type == htons(ETH_P_IP)) 920 netif_dbg(efx, rx_status, efx->net_dev, 921 "failed to steer %s %pI4:%u:%pI4:%u to queue %u [flow %u rc %d id %u]\n", 922 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 923 req->spec.rem_host, ntohs(req->spec.rem_port), 924 req->spec.loc_host, ntohs(req->spec.loc_port), 925 req->rxq_index, req->flow_id, rc, arfs_id); 926 else 927 netif_dbg(efx, rx_status, efx->net_dev, 928 "failed to steer %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u rc %d id %u]\n", 929 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 930 req->spec.rem_host, ntohs(req->spec.rem_port), 931 req->spec.loc_host, ntohs(req->spec.loc_port), 932 req->rxq_index, req->flow_id, rc, arfs_id); 933 channel->n_rfs_failed++; 934 /* We're overloading the NIC's filter tables, so let's do a 935 * chunk of extra expiry work. 936 */ 937 __efx_filter_rfs_expire(channel, min(channel->rfs_filter_count, 938 100u)); 939 } 940 941 /* Release references */ 942 clear_bit(slot_idx, &efx->rps_slot_map); 943 dev_put(req->net_dev); 944 } 945 946 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb, 947 u16 rxq_index, u32 flow_id) 948 { 949 struct efx_nic *efx = netdev_priv(net_dev); 950 struct efx_async_filter_insertion *req; 951 struct efx_arfs_rule *rule; 952 struct flow_keys fk; 953 int slot_idx; 954 bool new; 955 int rc; 956 957 /* find a free slot */ 958 for (slot_idx = 0; slot_idx < EFX_RPS_MAX_IN_FLIGHT; slot_idx++) 959 if (!test_and_set_bit(slot_idx, &efx->rps_slot_map)) 960 break; 961 if (slot_idx >= EFX_RPS_MAX_IN_FLIGHT) 962 return -EBUSY; 963 964 if (flow_id == RPS_FLOW_ID_INVALID) { 965 rc = -EINVAL; 966 goto out_clear; 967 } 968 969 if (!skb_flow_dissect_flow_keys(skb, &fk, 0)) { 970 rc = -EPROTONOSUPPORT; 971 goto out_clear; 972 } 973 974 if (fk.basic.n_proto != htons(ETH_P_IP) && fk.basic.n_proto != htons(ETH_P_IPV6)) { 975 rc = -EPROTONOSUPPORT; 976 goto out_clear; 977 } 978 if (fk.control.flags & FLOW_DIS_IS_FRAGMENT) { 979 rc = -EPROTONOSUPPORT; 980 goto out_clear; 981 } 982 983 req = efx->rps_slot + slot_idx; 984 efx_filter_init_rx(&req->spec, EFX_FILTER_PRI_HINT, 985 efx->rx_scatter ? EFX_FILTER_FLAG_RX_SCATTER : 0, 986 rxq_index); 987 req->spec.match_flags = 988 EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_IP_PROTO | 989 EFX_FILTER_MATCH_LOC_HOST | EFX_FILTER_MATCH_LOC_PORT | 990 EFX_FILTER_MATCH_REM_HOST | EFX_FILTER_MATCH_REM_PORT; 991 req->spec.ether_type = fk.basic.n_proto; 992 req->spec.ip_proto = fk.basic.ip_proto; 993 994 if (fk.basic.n_proto == htons(ETH_P_IP)) { 995 req->spec.rem_host[0] = fk.addrs.v4addrs.src; 996 req->spec.loc_host[0] = fk.addrs.v4addrs.dst; 997 } else { 998 memcpy(req->spec.rem_host, &fk.addrs.v6addrs.src, 999 sizeof(struct in6_addr)); 1000 memcpy(req->spec.loc_host, &fk.addrs.v6addrs.dst, 1001 sizeof(struct in6_addr)); 1002 } 1003 1004 req->spec.rem_port = fk.ports.src; 1005 req->spec.loc_port = fk.ports.dst; 1006 1007 if (efx->rps_hash_table) { 1008 /* Add it to ARFS hash table */ 1009 spin_lock(&efx->rps_hash_lock); 1010 rule = efx_rps_hash_add(efx, &req->spec, &new); 1011 if (!rule) { 1012 rc = -ENOMEM; 1013 goto out_unlock; 1014 } 1015 if (new) 1016 rule->arfs_id = efx->rps_next_id++ % RPS_NO_FILTER; 1017 rc = rule->arfs_id; 1018 /* Skip if existing or pending filter already does the right thing */ 1019 if (!new && rule->rxq_index == rxq_index && 1020 rule->filter_id >= EFX_ARFS_FILTER_ID_PENDING) 1021 goto out_unlock; 1022 rule->rxq_index = rxq_index; 1023 rule->filter_id = EFX_ARFS_FILTER_ID_PENDING; 1024 spin_unlock(&efx->rps_hash_lock); 1025 } else { 1026 /* Without an ARFS hash table, we just use arfs_id 0 for all 1027 * filters. This means if multiple flows hash to the same 1028 * flow_id, all but the most recently touched will be eligible 1029 * for expiry. 1030 */ 1031 rc = 0; 1032 } 1033 1034 /* Queue the request */ 1035 dev_hold(req->net_dev = net_dev); 1036 INIT_WORK(&req->work, efx_filter_rfs_work); 1037 req->rxq_index = rxq_index; 1038 req->flow_id = flow_id; 1039 schedule_work(&req->work); 1040 return rc; 1041 out_unlock: 1042 spin_unlock(&efx->rps_hash_lock); 1043 out_clear: 1044 clear_bit(slot_idx, &efx->rps_slot_map); 1045 return rc; 1046 } 1047 1048 bool __efx_filter_rfs_expire(struct efx_channel *channel, unsigned int quota) 1049 { 1050 bool (*expire_one)(struct efx_nic *efx, u32 flow_id, unsigned int index); 1051 struct efx_nic *efx = channel->efx; 1052 unsigned int index, size, start; 1053 u32 flow_id; 1054 1055 if (!mutex_trylock(&efx->rps_mutex)) 1056 return false; 1057 expire_one = efx->type->filter_rfs_expire_one; 1058 index = channel->rfs_expire_index; 1059 start = index; 1060 size = efx->type->max_rx_ip_filters; 1061 while (quota) { 1062 flow_id = channel->rps_flow_id[index]; 1063 1064 if (flow_id != RPS_FLOW_ID_INVALID) { 1065 quota--; 1066 if (expire_one(efx, flow_id, index)) { 1067 netif_info(efx, rx_status, efx->net_dev, 1068 "expired filter %d [channel %u flow %u]\n", 1069 index, channel->channel, flow_id); 1070 channel->rps_flow_id[index] = RPS_FLOW_ID_INVALID; 1071 channel->rfs_filter_count--; 1072 } 1073 } 1074 if (++index == size) 1075 index = 0; 1076 /* If we were called with a quota that exceeds the total number 1077 * of filters in the table (which shouldn't happen, but could 1078 * if two callers race), ensure that we don't loop forever - 1079 * stop when we've examined every row of the table. 1080 */ 1081 if (index == start) 1082 break; 1083 } 1084 1085 channel->rfs_expire_index = index; 1086 mutex_unlock(&efx->rps_mutex); 1087 return true; 1088 } 1089 1090 #endif /* CONFIG_RFS_ACCEL */ 1091