1 // SPDX-License-Identifier: GPL-2.0-only 2 /**************************************************************************** 3 * Driver for Solarflare network controllers and boards 4 * Copyright 2005-2006 Fen Systems Ltd. 5 * Copyright 2005-2013 Solarflare Communications Inc. 6 */ 7 8 #include <linux/socket.h> 9 #include <linux/in.h> 10 #include <linux/slab.h> 11 #include <linux/ip.h> 12 #include <linux/ipv6.h> 13 #include <linux/tcp.h> 14 #include <linux/udp.h> 15 #include <linux/prefetch.h> 16 #include <linux/moduleparam.h> 17 #include <linux/iommu.h> 18 #include <net/ip.h> 19 #include <net/checksum.h> 20 #include <net/xdp.h> 21 #include <linux/bpf_trace.h> 22 #include "net_driver.h" 23 #include "efx.h" 24 #include "rx_common.h" 25 #include "filter.h" 26 #include "nic.h" 27 #include "selftest.h" 28 #include "workarounds.h" 29 30 /* Preferred number of descriptors to fill at once */ 31 #define EFX_RX_PREFERRED_BATCH 8U 32 33 /* Maximum rx prefix used by any architecture. */ 34 #define EFX_MAX_RX_PREFIX_SIZE 16 35 36 /* Size of buffer allocated for skb header area. */ 37 #define EFX_SKB_HEADERS 128u 38 39 /* Each packet can consume up to ceil(max_frame_len / buffer_size) buffers */ 40 #define EFX_RX_MAX_FRAGS DIV_ROUND_UP(EFX_MAX_FRAME_LEN(EFX_MAX_MTU), \ 41 EFX_RX_USR_BUF_SIZE) 42 43 static inline void efx_sync_rx_buffer(struct efx_nic *efx, 44 struct efx_rx_buffer *rx_buf, 45 unsigned int len) 46 { 47 dma_sync_single_for_cpu(&efx->pci_dev->dev, rx_buf->dma_addr, len, 48 DMA_FROM_DEVICE); 49 } 50 51 static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue, 52 struct efx_rx_buffer *rx_buf, 53 int len) 54 { 55 struct efx_nic *efx = rx_queue->efx; 56 unsigned max_len = rx_buf->len - efx->type->rx_buffer_padding; 57 58 if (likely(len <= max_len)) 59 return; 60 61 /* The packet must be discarded, but this is only a fatal error 62 * if the caller indicated it was 63 */ 64 rx_buf->flags |= EFX_RX_PKT_DISCARD; 65 66 if (net_ratelimit()) 67 netif_err(efx, rx_err, efx->net_dev, 68 "RX queue %d overlength RX event (%#x > %#x)\n", 69 efx_rx_queue_index(rx_queue), len, max_len); 70 71 efx_rx_queue_channel(rx_queue)->n_rx_overlength++; 72 } 73 74 /* Allocate and construct an SKB around page fragments */ 75 static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel, 76 struct efx_rx_buffer *rx_buf, 77 unsigned int n_frags, 78 u8 *eh, int hdr_len) 79 { 80 struct efx_nic *efx = channel->efx; 81 struct sk_buff *skb; 82 83 /* Allocate an SKB to store the headers */ 84 skb = netdev_alloc_skb(efx->net_dev, 85 efx->rx_ip_align + efx->rx_prefix_size + 86 hdr_len); 87 if (unlikely(skb == NULL)) { 88 atomic_inc(&efx->n_rx_noskb_drops); 89 return NULL; 90 } 91 92 EFX_WARN_ON_ONCE_PARANOID(rx_buf->len < hdr_len); 93 94 memcpy(skb->data + efx->rx_ip_align, eh - efx->rx_prefix_size, 95 efx->rx_prefix_size + hdr_len); 96 skb_reserve(skb, efx->rx_ip_align + efx->rx_prefix_size); 97 __skb_put(skb, hdr_len); 98 99 /* Append the remaining page(s) onto the frag list */ 100 if (rx_buf->len > hdr_len) { 101 rx_buf->page_offset += hdr_len; 102 rx_buf->len -= hdr_len; 103 104 for (;;) { 105 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, 106 rx_buf->page, rx_buf->page_offset, 107 rx_buf->len); 108 rx_buf->page = NULL; 109 skb->len += rx_buf->len; 110 skb->data_len += rx_buf->len; 111 if (skb_shinfo(skb)->nr_frags == n_frags) 112 break; 113 114 rx_buf = efx_rx_buf_next(&channel->rx_queue, rx_buf); 115 } 116 } else { 117 __free_pages(rx_buf->page, efx->rx_buffer_order); 118 rx_buf->page = NULL; 119 n_frags = 0; 120 } 121 122 skb->truesize += n_frags * efx->rx_buffer_truesize; 123 124 /* Move past the ethernet header */ 125 skb->protocol = eth_type_trans(skb, efx->net_dev); 126 127 skb_mark_napi_id(skb, &channel->napi_str); 128 129 return skb; 130 } 131 132 void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index, 133 unsigned int n_frags, unsigned int len, u16 flags) 134 { 135 struct efx_nic *efx = rx_queue->efx; 136 struct efx_channel *channel = efx_rx_queue_channel(rx_queue); 137 struct efx_rx_buffer *rx_buf; 138 139 rx_queue->rx_packets++; 140 141 rx_buf = efx_rx_buffer(rx_queue, index); 142 rx_buf->flags |= flags; 143 144 /* Validate the number of fragments and completed length */ 145 if (n_frags == 1) { 146 if (!(flags & EFX_RX_PKT_PREFIX_LEN)) 147 efx_rx_packet__check_len(rx_queue, rx_buf, len); 148 } else if (unlikely(n_frags > EFX_RX_MAX_FRAGS) || 149 unlikely(len <= (n_frags - 1) * efx->rx_dma_len) || 150 unlikely(len > n_frags * efx->rx_dma_len) || 151 unlikely(!efx->rx_scatter)) { 152 /* If this isn't an explicit discard request, either 153 * the hardware or the driver is broken. 154 */ 155 WARN_ON(!(len == 0 && rx_buf->flags & EFX_RX_PKT_DISCARD)); 156 rx_buf->flags |= EFX_RX_PKT_DISCARD; 157 } 158 159 netif_vdbg(efx, rx_status, efx->net_dev, 160 "RX queue %d received ids %x-%x len %d %s%s\n", 161 efx_rx_queue_index(rx_queue), index, 162 (index + n_frags - 1) & rx_queue->ptr_mask, len, 163 (rx_buf->flags & EFX_RX_PKT_CSUMMED) ? " [SUMMED]" : "", 164 (rx_buf->flags & EFX_RX_PKT_DISCARD) ? " [DISCARD]" : ""); 165 166 /* Discard packet, if instructed to do so. Process the 167 * previous receive first. 168 */ 169 if (unlikely(rx_buf->flags & EFX_RX_PKT_DISCARD)) { 170 efx_rx_flush_packet(channel); 171 efx_discard_rx_packet(channel, rx_buf, n_frags); 172 return; 173 } 174 175 if (n_frags == 1 && !(flags & EFX_RX_PKT_PREFIX_LEN)) 176 rx_buf->len = len; 177 178 /* Release and/or sync the DMA mapping - assumes all RX buffers 179 * consumed in-order per RX queue. 180 */ 181 efx_sync_rx_buffer(efx, rx_buf, rx_buf->len); 182 183 /* Prefetch nice and early so data will (hopefully) be in cache by 184 * the time we look at it. 185 */ 186 prefetch(efx_rx_buf_va(rx_buf)); 187 188 rx_buf->page_offset += efx->rx_prefix_size; 189 rx_buf->len -= efx->rx_prefix_size; 190 191 if (n_frags > 1) { 192 /* Release/sync DMA mapping for additional fragments. 193 * Fix length for last fragment. 194 */ 195 unsigned int tail_frags = n_frags - 1; 196 197 for (;;) { 198 rx_buf = efx_rx_buf_next(rx_queue, rx_buf); 199 if (--tail_frags == 0) 200 break; 201 efx_sync_rx_buffer(efx, rx_buf, efx->rx_dma_len); 202 } 203 rx_buf->len = len - (n_frags - 1) * efx->rx_dma_len; 204 efx_sync_rx_buffer(efx, rx_buf, rx_buf->len); 205 } 206 207 /* All fragments have been DMA-synced, so recycle pages. */ 208 rx_buf = efx_rx_buffer(rx_queue, index); 209 efx_recycle_rx_pages(channel, rx_buf, n_frags); 210 211 /* Pipeline receives so that we give time for packet headers to be 212 * prefetched into cache. 213 */ 214 efx_rx_flush_packet(channel); 215 channel->rx_pkt_n_frags = n_frags; 216 channel->rx_pkt_index = index; 217 } 218 219 static void efx_rx_deliver(struct efx_channel *channel, u8 *eh, 220 struct efx_rx_buffer *rx_buf, 221 unsigned int n_frags) 222 { 223 struct sk_buff *skb; 224 u16 hdr_len = min_t(u16, rx_buf->len, EFX_SKB_HEADERS); 225 226 skb = efx_rx_mk_skb(channel, rx_buf, n_frags, eh, hdr_len); 227 if (unlikely(skb == NULL)) { 228 struct efx_rx_queue *rx_queue; 229 230 rx_queue = efx_channel_get_rx_queue(channel); 231 efx_free_rx_buffers(rx_queue, rx_buf, n_frags); 232 return; 233 } 234 skb_record_rx_queue(skb, channel->rx_queue.core_index); 235 236 /* Set the SKB flags */ 237 skb_checksum_none_assert(skb); 238 if (likely(rx_buf->flags & EFX_RX_PKT_CSUMMED)) { 239 skb->ip_summed = CHECKSUM_UNNECESSARY; 240 skb->csum_level = !!(rx_buf->flags & EFX_RX_PKT_CSUM_LEVEL); 241 } 242 243 efx_rx_skb_attach_timestamp(channel, skb); 244 245 if (channel->type->receive_skb) 246 if (channel->type->receive_skb(channel, skb)) 247 return; 248 249 /* Pass the packet up */ 250 if (channel->rx_list != NULL) 251 /* Add to list, will pass up later */ 252 list_add_tail(&skb->list, channel->rx_list); 253 else 254 /* No list, so pass it up now */ 255 netif_receive_skb(skb); 256 } 257 258 /** efx_do_xdp: perform XDP processing on a received packet 259 * 260 * Returns true if packet should still be delivered. 261 */ 262 static bool efx_do_xdp(struct efx_nic *efx, struct efx_channel *channel, 263 struct efx_rx_buffer *rx_buf, u8 **ehp) 264 { 265 u8 rx_prefix[EFX_MAX_RX_PREFIX_SIZE]; 266 struct efx_rx_queue *rx_queue; 267 struct bpf_prog *xdp_prog; 268 struct xdp_frame *xdpf; 269 struct xdp_buff xdp; 270 u32 xdp_act; 271 s16 offset; 272 int err; 273 274 rcu_read_lock(); 275 xdp_prog = rcu_dereference(efx->xdp_prog); 276 if (!xdp_prog) { 277 rcu_read_unlock(); 278 return true; 279 } 280 281 rx_queue = efx_channel_get_rx_queue(channel); 282 283 if (unlikely(channel->rx_pkt_n_frags > 1)) { 284 /* We can't do XDP on fragmented packets - drop. */ 285 rcu_read_unlock(); 286 efx_free_rx_buffers(rx_queue, rx_buf, 287 channel->rx_pkt_n_frags); 288 if (net_ratelimit()) 289 netif_err(efx, rx_err, efx->net_dev, 290 "XDP is not possible with multiple receive fragments (%d)\n", 291 channel->rx_pkt_n_frags); 292 channel->n_rx_xdp_bad_drops++; 293 return false; 294 } 295 296 dma_sync_single_for_cpu(&efx->pci_dev->dev, rx_buf->dma_addr, 297 rx_buf->len, DMA_FROM_DEVICE); 298 299 /* Save the rx prefix. */ 300 EFX_WARN_ON_PARANOID(efx->rx_prefix_size > EFX_MAX_RX_PREFIX_SIZE); 301 memcpy(rx_prefix, *ehp - efx->rx_prefix_size, 302 efx->rx_prefix_size); 303 304 xdp.data = *ehp; 305 xdp.data_hard_start = xdp.data - EFX_XDP_HEADROOM; 306 307 /* No support yet for XDP metadata */ 308 xdp_set_data_meta_invalid(&xdp); 309 xdp.data_end = xdp.data + rx_buf->len; 310 xdp.rxq = &rx_queue->xdp_rxq_info; 311 312 xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp); 313 rcu_read_unlock(); 314 315 offset = (u8 *)xdp.data - *ehp; 316 317 switch (xdp_act) { 318 case XDP_PASS: 319 /* Fix up rx prefix. */ 320 if (offset) { 321 *ehp += offset; 322 rx_buf->page_offset += offset; 323 rx_buf->len -= offset; 324 memcpy(*ehp - efx->rx_prefix_size, rx_prefix, 325 efx->rx_prefix_size); 326 } 327 break; 328 329 case XDP_TX: 330 /* Buffer ownership passes to tx on success. */ 331 xdpf = convert_to_xdp_frame(&xdp); 332 err = efx_xdp_tx_buffers(efx, 1, &xdpf, true); 333 if (unlikely(err != 1)) { 334 efx_free_rx_buffers(rx_queue, rx_buf, 1); 335 if (net_ratelimit()) 336 netif_err(efx, rx_err, efx->net_dev, 337 "XDP TX failed (%d)\n", err); 338 channel->n_rx_xdp_bad_drops++; 339 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); 340 } else { 341 channel->n_rx_xdp_tx++; 342 } 343 break; 344 345 case XDP_REDIRECT: 346 err = xdp_do_redirect(efx->net_dev, &xdp, xdp_prog); 347 if (unlikely(err)) { 348 efx_free_rx_buffers(rx_queue, rx_buf, 1); 349 if (net_ratelimit()) 350 netif_err(efx, rx_err, efx->net_dev, 351 "XDP redirect failed (%d)\n", err); 352 channel->n_rx_xdp_bad_drops++; 353 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); 354 } else { 355 channel->n_rx_xdp_redirect++; 356 } 357 break; 358 359 default: 360 bpf_warn_invalid_xdp_action(xdp_act); 361 efx_free_rx_buffers(rx_queue, rx_buf, 1); 362 channel->n_rx_xdp_bad_drops++; 363 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); 364 break; 365 366 case XDP_ABORTED: 367 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); 368 /* Fall through */ 369 case XDP_DROP: 370 efx_free_rx_buffers(rx_queue, rx_buf, 1); 371 channel->n_rx_xdp_drops++; 372 break; 373 } 374 375 return xdp_act == XDP_PASS; 376 } 377 378 /* Handle a received packet. Second half: Touches packet payload. */ 379 void __efx_rx_packet(struct efx_channel *channel) 380 { 381 struct efx_nic *efx = channel->efx; 382 struct efx_rx_buffer *rx_buf = 383 efx_rx_buffer(&channel->rx_queue, channel->rx_pkt_index); 384 u8 *eh = efx_rx_buf_va(rx_buf); 385 386 /* Read length from the prefix if necessary. This already 387 * excludes the length of the prefix itself. 388 */ 389 if (rx_buf->flags & EFX_RX_PKT_PREFIX_LEN) 390 rx_buf->len = le16_to_cpup((__le16 *) 391 (eh + efx->rx_packet_len_offset)); 392 393 /* If we're in loopback test, then pass the packet directly to the 394 * loopback layer, and free the rx_buf here 395 */ 396 if (unlikely(efx->loopback_selftest)) { 397 struct efx_rx_queue *rx_queue; 398 399 efx_loopback_rx_packet(efx, eh, rx_buf->len); 400 rx_queue = efx_channel_get_rx_queue(channel); 401 efx_free_rx_buffers(rx_queue, rx_buf, 402 channel->rx_pkt_n_frags); 403 goto out; 404 } 405 406 if (!efx_do_xdp(efx, channel, rx_buf, &eh)) 407 goto out; 408 409 if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM))) 410 rx_buf->flags &= ~EFX_RX_PKT_CSUMMED; 411 412 if ((rx_buf->flags & EFX_RX_PKT_TCP) && !channel->type->receive_skb) 413 efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh); 414 else 415 efx_rx_deliver(channel, eh, rx_buf, channel->rx_pkt_n_frags); 416 out: 417 channel->rx_pkt_n_frags = 0; 418 } 419 420 #ifdef CONFIG_RFS_ACCEL 421 422 static void efx_filter_rfs_work(struct work_struct *data) 423 { 424 struct efx_async_filter_insertion *req = container_of(data, struct efx_async_filter_insertion, 425 work); 426 struct efx_nic *efx = netdev_priv(req->net_dev); 427 struct efx_channel *channel = efx_get_channel(efx, req->rxq_index); 428 int slot_idx = req - efx->rps_slot; 429 struct efx_arfs_rule *rule; 430 u16 arfs_id = 0; 431 int rc; 432 433 rc = efx->type->filter_insert(efx, &req->spec, true); 434 if (rc >= 0) 435 /* Discard 'priority' part of EF10+ filter ID (mcdi_filters) */ 436 rc %= efx->type->max_rx_ip_filters; 437 if (efx->rps_hash_table) { 438 spin_lock_bh(&efx->rps_hash_lock); 439 rule = efx_rps_hash_find(efx, &req->spec); 440 /* The rule might have already gone, if someone else's request 441 * for the same spec was already worked and then expired before 442 * we got around to our work. In that case we have nothing 443 * tying us to an arfs_id, meaning that as soon as the filter 444 * is considered for expiry it will be removed. 445 */ 446 if (rule) { 447 if (rc < 0) 448 rule->filter_id = EFX_ARFS_FILTER_ID_ERROR; 449 else 450 rule->filter_id = rc; 451 arfs_id = rule->arfs_id; 452 } 453 spin_unlock_bh(&efx->rps_hash_lock); 454 } 455 if (rc >= 0) { 456 /* Remember this so we can check whether to expire the filter 457 * later. 458 */ 459 mutex_lock(&efx->rps_mutex); 460 if (channel->rps_flow_id[rc] == RPS_FLOW_ID_INVALID) 461 channel->rfs_filter_count++; 462 channel->rps_flow_id[rc] = req->flow_id; 463 mutex_unlock(&efx->rps_mutex); 464 465 if (req->spec.ether_type == htons(ETH_P_IP)) 466 netif_info(efx, rx_status, efx->net_dev, 467 "steering %s %pI4:%u:%pI4:%u to queue %u [flow %u filter %d id %u]\n", 468 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 469 req->spec.rem_host, ntohs(req->spec.rem_port), 470 req->spec.loc_host, ntohs(req->spec.loc_port), 471 req->rxq_index, req->flow_id, rc, arfs_id); 472 else 473 netif_info(efx, rx_status, efx->net_dev, 474 "steering %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u filter %d id %u]\n", 475 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 476 req->spec.rem_host, ntohs(req->spec.rem_port), 477 req->spec.loc_host, ntohs(req->spec.loc_port), 478 req->rxq_index, req->flow_id, rc, arfs_id); 479 channel->n_rfs_succeeded++; 480 } else { 481 if (req->spec.ether_type == htons(ETH_P_IP)) 482 netif_dbg(efx, rx_status, efx->net_dev, 483 "failed to steer %s %pI4:%u:%pI4:%u to queue %u [flow %u rc %d id %u]\n", 484 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 485 req->spec.rem_host, ntohs(req->spec.rem_port), 486 req->spec.loc_host, ntohs(req->spec.loc_port), 487 req->rxq_index, req->flow_id, rc, arfs_id); 488 else 489 netif_dbg(efx, rx_status, efx->net_dev, 490 "failed to steer %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u rc %d id %u]\n", 491 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 492 req->spec.rem_host, ntohs(req->spec.rem_port), 493 req->spec.loc_host, ntohs(req->spec.loc_port), 494 req->rxq_index, req->flow_id, rc, arfs_id); 495 channel->n_rfs_failed++; 496 /* We're overloading the NIC's filter tables, so let's do a 497 * chunk of extra expiry work. 498 */ 499 __efx_filter_rfs_expire(channel, min(channel->rfs_filter_count, 500 100u)); 501 } 502 503 /* Release references */ 504 clear_bit(slot_idx, &efx->rps_slot_map); 505 dev_put(req->net_dev); 506 } 507 508 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb, 509 u16 rxq_index, u32 flow_id) 510 { 511 struct efx_nic *efx = netdev_priv(net_dev); 512 struct efx_async_filter_insertion *req; 513 struct efx_arfs_rule *rule; 514 struct flow_keys fk; 515 int slot_idx; 516 bool new; 517 int rc; 518 519 /* find a free slot */ 520 for (slot_idx = 0; slot_idx < EFX_RPS_MAX_IN_FLIGHT; slot_idx++) 521 if (!test_and_set_bit(slot_idx, &efx->rps_slot_map)) 522 break; 523 if (slot_idx >= EFX_RPS_MAX_IN_FLIGHT) 524 return -EBUSY; 525 526 if (flow_id == RPS_FLOW_ID_INVALID) { 527 rc = -EINVAL; 528 goto out_clear; 529 } 530 531 if (!skb_flow_dissect_flow_keys(skb, &fk, 0)) { 532 rc = -EPROTONOSUPPORT; 533 goto out_clear; 534 } 535 536 if (fk.basic.n_proto != htons(ETH_P_IP) && fk.basic.n_proto != htons(ETH_P_IPV6)) { 537 rc = -EPROTONOSUPPORT; 538 goto out_clear; 539 } 540 if (fk.control.flags & FLOW_DIS_IS_FRAGMENT) { 541 rc = -EPROTONOSUPPORT; 542 goto out_clear; 543 } 544 545 req = efx->rps_slot + slot_idx; 546 efx_filter_init_rx(&req->spec, EFX_FILTER_PRI_HINT, 547 efx->rx_scatter ? EFX_FILTER_FLAG_RX_SCATTER : 0, 548 rxq_index); 549 req->spec.match_flags = 550 EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_IP_PROTO | 551 EFX_FILTER_MATCH_LOC_HOST | EFX_FILTER_MATCH_LOC_PORT | 552 EFX_FILTER_MATCH_REM_HOST | EFX_FILTER_MATCH_REM_PORT; 553 req->spec.ether_type = fk.basic.n_proto; 554 req->spec.ip_proto = fk.basic.ip_proto; 555 556 if (fk.basic.n_proto == htons(ETH_P_IP)) { 557 req->spec.rem_host[0] = fk.addrs.v4addrs.src; 558 req->spec.loc_host[0] = fk.addrs.v4addrs.dst; 559 } else { 560 memcpy(req->spec.rem_host, &fk.addrs.v6addrs.src, 561 sizeof(struct in6_addr)); 562 memcpy(req->spec.loc_host, &fk.addrs.v6addrs.dst, 563 sizeof(struct in6_addr)); 564 } 565 566 req->spec.rem_port = fk.ports.src; 567 req->spec.loc_port = fk.ports.dst; 568 569 if (efx->rps_hash_table) { 570 /* Add it to ARFS hash table */ 571 spin_lock(&efx->rps_hash_lock); 572 rule = efx_rps_hash_add(efx, &req->spec, &new); 573 if (!rule) { 574 rc = -ENOMEM; 575 goto out_unlock; 576 } 577 if (new) 578 rule->arfs_id = efx->rps_next_id++ % RPS_NO_FILTER; 579 rc = rule->arfs_id; 580 /* Skip if existing or pending filter already does the right thing */ 581 if (!new && rule->rxq_index == rxq_index && 582 rule->filter_id >= EFX_ARFS_FILTER_ID_PENDING) 583 goto out_unlock; 584 rule->rxq_index = rxq_index; 585 rule->filter_id = EFX_ARFS_FILTER_ID_PENDING; 586 spin_unlock(&efx->rps_hash_lock); 587 } else { 588 /* Without an ARFS hash table, we just use arfs_id 0 for all 589 * filters. This means if multiple flows hash to the same 590 * flow_id, all but the most recently touched will be eligible 591 * for expiry. 592 */ 593 rc = 0; 594 } 595 596 /* Queue the request */ 597 dev_hold(req->net_dev = net_dev); 598 INIT_WORK(&req->work, efx_filter_rfs_work); 599 req->rxq_index = rxq_index; 600 req->flow_id = flow_id; 601 schedule_work(&req->work); 602 return rc; 603 out_unlock: 604 spin_unlock(&efx->rps_hash_lock); 605 out_clear: 606 clear_bit(slot_idx, &efx->rps_slot_map); 607 return rc; 608 } 609 610 bool __efx_filter_rfs_expire(struct efx_channel *channel, unsigned int quota) 611 { 612 bool (*expire_one)(struct efx_nic *efx, u32 flow_id, unsigned int index); 613 struct efx_nic *efx = channel->efx; 614 unsigned int index, size, start; 615 u32 flow_id; 616 617 if (!mutex_trylock(&efx->rps_mutex)) 618 return false; 619 expire_one = efx->type->filter_rfs_expire_one; 620 index = channel->rfs_expire_index; 621 start = index; 622 size = efx->type->max_rx_ip_filters; 623 while (quota) { 624 flow_id = channel->rps_flow_id[index]; 625 626 if (flow_id != RPS_FLOW_ID_INVALID) { 627 quota--; 628 if (expire_one(efx, flow_id, index)) { 629 netif_info(efx, rx_status, efx->net_dev, 630 "expired filter %d [channel %u flow %u]\n", 631 index, channel->channel, flow_id); 632 channel->rps_flow_id[index] = RPS_FLOW_ID_INVALID; 633 channel->rfs_filter_count--; 634 } 635 } 636 if (++index == size) 637 index = 0; 638 /* If we were called with a quota that exceeds the total number 639 * of filters in the table (which shouldn't happen, but could 640 * if two callers race), ensure that we don't loop forever - 641 * stop when we've examined every row of the table. 642 */ 643 if (index == start) 644 break; 645 } 646 647 channel->rfs_expire_index = index; 648 mutex_unlock(&efx->rps_mutex); 649 return true; 650 } 651 652 #endif /* CONFIG_RFS_ACCEL */ 653