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 xdp.frame_sz = efx->rx_page_buf_step; 312 313 xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp); 314 rcu_read_unlock(); 315 316 offset = (u8 *)xdp.data - *ehp; 317 318 switch (xdp_act) { 319 case XDP_PASS: 320 /* Fix up rx prefix. */ 321 if (offset) { 322 *ehp += offset; 323 rx_buf->page_offset += offset; 324 rx_buf->len -= offset; 325 memcpy(*ehp - efx->rx_prefix_size, rx_prefix, 326 efx->rx_prefix_size); 327 } 328 break; 329 330 case XDP_TX: 331 /* Buffer ownership passes to tx on success. */ 332 xdpf = xdp_convert_buff_to_frame(&xdp); 333 err = efx_xdp_tx_buffers(efx, 1, &xdpf, true); 334 if (unlikely(err != 1)) { 335 efx_free_rx_buffers(rx_queue, rx_buf, 1); 336 if (net_ratelimit()) 337 netif_err(efx, rx_err, efx->net_dev, 338 "XDP TX failed (%d)\n", err); 339 channel->n_rx_xdp_bad_drops++; 340 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); 341 } else { 342 channel->n_rx_xdp_tx++; 343 } 344 break; 345 346 case XDP_REDIRECT: 347 err = xdp_do_redirect(efx->net_dev, &xdp, xdp_prog); 348 if (unlikely(err)) { 349 efx_free_rx_buffers(rx_queue, rx_buf, 1); 350 if (net_ratelimit()) 351 netif_err(efx, rx_err, efx->net_dev, 352 "XDP redirect failed (%d)\n", err); 353 channel->n_rx_xdp_bad_drops++; 354 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); 355 } else { 356 channel->n_rx_xdp_redirect++; 357 } 358 break; 359 360 default: 361 bpf_warn_invalid_xdp_action(xdp_act); 362 efx_free_rx_buffers(rx_queue, rx_buf, 1); 363 channel->n_rx_xdp_bad_drops++; 364 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); 365 break; 366 367 case XDP_ABORTED: 368 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act); 369 /* Fall through */ 370 case XDP_DROP: 371 efx_free_rx_buffers(rx_queue, rx_buf, 1); 372 channel->n_rx_xdp_drops++; 373 break; 374 } 375 376 return xdp_act == XDP_PASS; 377 } 378 379 /* Handle a received packet. Second half: Touches packet payload. */ 380 void __efx_rx_packet(struct efx_channel *channel) 381 { 382 struct efx_nic *efx = channel->efx; 383 struct efx_rx_buffer *rx_buf = 384 efx_rx_buffer(&channel->rx_queue, channel->rx_pkt_index); 385 u8 *eh = efx_rx_buf_va(rx_buf); 386 387 /* Read length from the prefix if necessary. This already 388 * excludes the length of the prefix itself. 389 */ 390 if (rx_buf->flags & EFX_RX_PKT_PREFIX_LEN) 391 rx_buf->len = le16_to_cpup((__le16 *) 392 (eh + efx->rx_packet_len_offset)); 393 394 /* If we're in loopback test, then pass the packet directly to the 395 * loopback layer, and free the rx_buf here 396 */ 397 if (unlikely(efx->loopback_selftest)) { 398 struct efx_rx_queue *rx_queue; 399 400 efx_loopback_rx_packet(efx, eh, rx_buf->len); 401 rx_queue = efx_channel_get_rx_queue(channel); 402 efx_free_rx_buffers(rx_queue, rx_buf, 403 channel->rx_pkt_n_frags); 404 goto out; 405 } 406 407 if (!efx_do_xdp(efx, channel, rx_buf, &eh)) 408 goto out; 409 410 if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM))) 411 rx_buf->flags &= ~EFX_RX_PKT_CSUMMED; 412 413 if ((rx_buf->flags & EFX_RX_PKT_TCP) && !channel->type->receive_skb) 414 efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh); 415 else 416 efx_rx_deliver(channel, eh, rx_buf, channel->rx_pkt_n_frags); 417 out: 418 channel->rx_pkt_n_frags = 0; 419 } 420 421 #ifdef CONFIG_RFS_ACCEL 422 423 static void efx_filter_rfs_work(struct work_struct *data) 424 { 425 struct efx_async_filter_insertion *req = container_of(data, struct efx_async_filter_insertion, 426 work); 427 struct efx_nic *efx = netdev_priv(req->net_dev); 428 struct efx_channel *channel = efx_get_channel(efx, req->rxq_index); 429 int slot_idx = req - efx->rps_slot; 430 struct efx_arfs_rule *rule; 431 u16 arfs_id = 0; 432 int rc; 433 434 rc = efx->type->filter_insert(efx, &req->spec, true); 435 if (rc >= 0) 436 /* Discard 'priority' part of EF10+ filter ID (mcdi_filters) */ 437 rc %= efx->type->max_rx_ip_filters; 438 if (efx->rps_hash_table) { 439 spin_lock_bh(&efx->rps_hash_lock); 440 rule = efx_rps_hash_find(efx, &req->spec); 441 /* The rule might have already gone, if someone else's request 442 * for the same spec was already worked and then expired before 443 * we got around to our work. In that case we have nothing 444 * tying us to an arfs_id, meaning that as soon as the filter 445 * is considered for expiry it will be removed. 446 */ 447 if (rule) { 448 if (rc < 0) 449 rule->filter_id = EFX_ARFS_FILTER_ID_ERROR; 450 else 451 rule->filter_id = rc; 452 arfs_id = rule->arfs_id; 453 } 454 spin_unlock_bh(&efx->rps_hash_lock); 455 } 456 if (rc >= 0) { 457 /* Remember this so we can check whether to expire the filter 458 * later. 459 */ 460 mutex_lock(&efx->rps_mutex); 461 if (channel->rps_flow_id[rc] == RPS_FLOW_ID_INVALID) 462 channel->rfs_filter_count++; 463 channel->rps_flow_id[rc] = req->flow_id; 464 mutex_unlock(&efx->rps_mutex); 465 466 if (req->spec.ether_type == htons(ETH_P_IP)) 467 netif_info(efx, rx_status, efx->net_dev, 468 "steering %s %pI4:%u:%pI4:%u to queue %u [flow %u filter %d id %u]\n", 469 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 470 req->spec.rem_host, ntohs(req->spec.rem_port), 471 req->spec.loc_host, ntohs(req->spec.loc_port), 472 req->rxq_index, req->flow_id, rc, arfs_id); 473 else 474 netif_info(efx, rx_status, efx->net_dev, 475 "steering %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u filter %d id %u]\n", 476 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 477 req->spec.rem_host, ntohs(req->spec.rem_port), 478 req->spec.loc_host, ntohs(req->spec.loc_port), 479 req->rxq_index, req->flow_id, rc, arfs_id); 480 channel->n_rfs_succeeded++; 481 } else { 482 if (req->spec.ether_type == htons(ETH_P_IP)) 483 netif_dbg(efx, rx_status, efx->net_dev, 484 "failed to steer %s %pI4:%u:%pI4:%u to queue %u [flow %u rc %d id %u]\n", 485 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 486 req->spec.rem_host, ntohs(req->spec.rem_port), 487 req->spec.loc_host, ntohs(req->spec.loc_port), 488 req->rxq_index, req->flow_id, rc, arfs_id); 489 else 490 netif_dbg(efx, rx_status, efx->net_dev, 491 "failed to steer %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u rc %d id %u]\n", 492 (req->spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP", 493 req->spec.rem_host, ntohs(req->spec.rem_port), 494 req->spec.loc_host, ntohs(req->spec.loc_port), 495 req->rxq_index, req->flow_id, rc, arfs_id); 496 channel->n_rfs_failed++; 497 /* We're overloading the NIC's filter tables, so let's do a 498 * chunk of extra expiry work. 499 */ 500 __efx_filter_rfs_expire(channel, min(channel->rfs_filter_count, 501 100u)); 502 } 503 504 /* Release references */ 505 clear_bit(slot_idx, &efx->rps_slot_map); 506 dev_put(req->net_dev); 507 } 508 509 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb, 510 u16 rxq_index, u32 flow_id) 511 { 512 struct efx_nic *efx = netdev_priv(net_dev); 513 struct efx_async_filter_insertion *req; 514 struct efx_arfs_rule *rule; 515 struct flow_keys fk; 516 int slot_idx; 517 bool new; 518 int rc; 519 520 /* find a free slot */ 521 for (slot_idx = 0; slot_idx < EFX_RPS_MAX_IN_FLIGHT; slot_idx++) 522 if (!test_and_set_bit(slot_idx, &efx->rps_slot_map)) 523 break; 524 if (slot_idx >= EFX_RPS_MAX_IN_FLIGHT) 525 return -EBUSY; 526 527 if (flow_id == RPS_FLOW_ID_INVALID) { 528 rc = -EINVAL; 529 goto out_clear; 530 } 531 532 if (!skb_flow_dissect_flow_keys(skb, &fk, 0)) { 533 rc = -EPROTONOSUPPORT; 534 goto out_clear; 535 } 536 537 if (fk.basic.n_proto != htons(ETH_P_IP) && fk.basic.n_proto != htons(ETH_P_IPV6)) { 538 rc = -EPROTONOSUPPORT; 539 goto out_clear; 540 } 541 if (fk.control.flags & FLOW_DIS_IS_FRAGMENT) { 542 rc = -EPROTONOSUPPORT; 543 goto out_clear; 544 } 545 546 req = efx->rps_slot + slot_idx; 547 efx_filter_init_rx(&req->spec, EFX_FILTER_PRI_HINT, 548 efx->rx_scatter ? EFX_FILTER_FLAG_RX_SCATTER : 0, 549 rxq_index); 550 req->spec.match_flags = 551 EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_IP_PROTO | 552 EFX_FILTER_MATCH_LOC_HOST | EFX_FILTER_MATCH_LOC_PORT | 553 EFX_FILTER_MATCH_REM_HOST | EFX_FILTER_MATCH_REM_PORT; 554 req->spec.ether_type = fk.basic.n_proto; 555 req->spec.ip_proto = fk.basic.ip_proto; 556 557 if (fk.basic.n_proto == htons(ETH_P_IP)) { 558 req->spec.rem_host[0] = fk.addrs.v4addrs.src; 559 req->spec.loc_host[0] = fk.addrs.v4addrs.dst; 560 } else { 561 memcpy(req->spec.rem_host, &fk.addrs.v6addrs.src, 562 sizeof(struct in6_addr)); 563 memcpy(req->spec.loc_host, &fk.addrs.v6addrs.dst, 564 sizeof(struct in6_addr)); 565 } 566 567 req->spec.rem_port = fk.ports.src; 568 req->spec.loc_port = fk.ports.dst; 569 570 if (efx->rps_hash_table) { 571 /* Add it to ARFS hash table */ 572 spin_lock(&efx->rps_hash_lock); 573 rule = efx_rps_hash_add(efx, &req->spec, &new); 574 if (!rule) { 575 rc = -ENOMEM; 576 goto out_unlock; 577 } 578 if (new) 579 rule->arfs_id = efx->rps_next_id++ % RPS_NO_FILTER; 580 rc = rule->arfs_id; 581 /* Skip if existing or pending filter already does the right thing */ 582 if (!new && rule->rxq_index == rxq_index && 583 rule->filter_id >= EFX_ARFS_FILTER_ID_PENDING) 584 goto out_unlock; 585 rule->rxq_index = rxq_index; 586 rule->filter_id = EFX_ARFS_FILTER_ID_PENDING; 587 spin_unlock(&efx->rps_hash_lock); 588 } else { 589 /* Without an ARFS hash table, we just use arfs_id 0 for all 590 * filters. This means if multiple flows hash to the same 591 * flow_id, all but the most recently touched will be eligible 592 * for expiry. 593 */ 594 rc = 0; 595 } 596 597 /* Queue the request */ 598 dev_hold(req->net_dev = net_dev); 599 INIT_WORK(&req->work, efx_filter_rfs_work); 600 req->rxq_index = rxq_index; 601 req->flow_id = flow_id; 602 schedule_work(&req->work); 603 return rc; 604 out_unlock: 605 spin_unlock(&efx->rps_hash_lock); 606 out_clear: 607 clear_bit(slot_idx, &efx->rps_slot_map); 608 return rc; 609 } 610 611 bool __efx_filter_rfs_expire(struct efx_channel *channel, unsigned int quota) 612 { 613 bool (*expire_one)(struct efx_nic *efx, u32 flow_id, unsigned int index); 614 struct efx_nic *efx = channel->efx; 615 unsigned int index, size, start; 616 u32 flow_id; 617 618 if (!mutex_trylock(&efx->rps_mutex)) 619 return false; 620 expire_one = efx->type->filter_rfs_expire_one; 621 index = channel->rfs_expire_index; 622 start = index; 623 size = efx->type->max_rx_ip_filters; 624 while (quota) { 625 flow_id = channel->rps_flow_id[index]; 626 627 if (flow_id != RPS_FLOW_ID_INVALID) { 628 quota--; 629 if (expire_one(efx, flow_id, index)) { 630 netif_info(efx, rx_status, efx->net_dev, 631 "expired filter %d [channel %u flow %u]\n", 632 index, channel->channel, flow_id); 633 channel->rps_flow_id[index] = RPS_FLOW_ID_INVALID; 634 channel->rfs_filter_count--; 635 } 636 } 637 if (++index == size) 638 index = 0; 639 /* If we were called with a quota that exceeds the total number 640 * of filters in the table (which shouldn't happen, but could 641 * if two callers race), ensure that we don't loop forever - 642 * stop when we've examined every row of the table. 643 */ 644 if (index == start) 645 break; 646 } 647 648 channel->rfs_expire_index = index; 649 mutex_unlock(&efx->rps_mutex); 650 return true; 651 } 652 653 #endif /* CONFIG_RFS_ACCEL */ 654