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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / net / ethernet / sfc / rx.c
blob260352d97d9d14f56b259ad033343dd08921fe39
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 */
Linux with added FPC-III support