1
2
3
4#include <linux/types.h>
5#include <linux/module.h>
6#include <net/ipv6.h>
7#include <net/ip.h>
8#include <net/tcp.h>
9#include <linux/if_macvlan.h>
10#include <linux/prefetch.h>
11
12#include "fm10k.h"
13
14#define DRV_VERSION "0.26.1-k"
15#define DRV_SUMMARY "Intel(R) Ethernet Switch Host Interface Driver"
16const char fm10k_driver_version[] = DRV_VERSION;
17char fm10k_driver_name[] = "fm10k";
18static const char fm10k_driver_string[] = DRV_SUMMARY;
19static const char fm10k_copyright[] =
20 "Copyright(c) 2013 - 2018 Intel Corporation.";
21
22MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
23MODULE_DESCRIPTION(DRV_SUMMARY);
24MODULE_LICENSE("GPL v2");
25MODULE_VERSION(DRV_VERSION);
26
27
28struct workqueue_struct *fm10k_workqueue;
29
30
31
32
33
34
35
36static int __init fm10k_init_module(void)
37{
38 pr_info("%s - version %s\n", fm10k_driver_string, fm10k_driver_version);
39 pr_info("%s\n", fm10k_copyright);
40
41
42 fm10k_workqueue = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0,
43 fm10k_driver_name);
44 if (!fm10k_workqueue)
45 return -ENOMEM;
46
47 fm10k_dbg_init();
48
49 return fm10k_register_pci_driver();
50}
51module_init(fm10k_init_module);
52
53
54
55
56
57
58
59static void __exit fm10k_exit_module(void)
60{
61 fm10k_unregister_pci_driver();
62
63 fm10k_dbg_exit();
64
65
66 destroy_workqueue(fm10k_workqueue);
67}
68module_exit(fm10k_exit_module);
69
70static bool fm10k_alloc_mapped_page(struct fm10k_ring *rx_ring,
71 struct fm10k_rx_buffer *bi)
72{
73 struct page *page = bi->page;
74 dma_addr_t dma;
75
76
77 if (likely(page))
78 return true;
79
80
81 page = dev_alloc_page();
82 if (unlikely(!page)) {
83 rx_ring->rx_stats.alloc_failed++;
84 return false;
85 }
86
87
88 dma = dma_map_page(rx_ring->dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
89
90
91
92
93 if (dma_mapping_error(rx_ring->dev, dma)) {
94 __free_page(page);
95
96 rx_ring->rx_stats.alloc_failed++;
97 return false;
98 }
99
100 bi->dma = dma;
101 bi->page = page;
102 bi->page_offset = 0;
103
104 return true;
105}
106
107
108
109
110
111
112void fm10k_alloc_rx_buffers(struct fm10k_ring *rx_ring, u16 cleaned_count)
113{
114 union fm10k_rx_desc *rx_desc;
115 struct fm10k_rx_buffer *bi;
116 u16 i = rx_ring->next_to_use;
117
118
119 if (!cleaned_count)
120 return;
121
122 rx_desc = FM10K_RX_DESC(rx_ring, i);
123 bi = &rx_ring->rx_buffer[i];
124 i -= rx_ring->count;
125
126 do {
127 if (!fm10k_alloc_mapped_page(rx_ring, bi))
128 break;
129
130
131
132
133 rx_desc->q.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);
134
135 rx_desc++;
136 bi++;
137 i++;
138 if (unlikely(!i)) {
139 rx_desc = FM10K_RX_DESC(rx_ring, 0);
140 bi = rx_ring->rx_buffer;
141 i -= rx_ring->count;
142 }
143
144
145 rx_desc->d.staterr = 0;
146
147 cleaned_count--;
148 } while (cleaned_count);
149
150 i += rx_ring->count;
151
152 if (rx_ring->next_to_use != i) {
153
154 rx_ring->next_to_use = i;
155
156
157 rx_ring->next_to_alloc = i;
158
159
160
161
162
163
164 wmb();
165
166
167 writel(i, rx_ring->tail);
168 }
169}
170
171
172
173
174
175
176
177
178static void fm10k_reuse_rx_page(struct fm10k_ring *rx_ring,
179 struct fm10k_rx_buffer *old_buff)
180{
181 struct fm10k_rx_buffer *new_buff;
182 u16 nta = rx_ring->next_to_alloc;
183
184 new_buff = &rx_ring->rx_buffer[nta];
185
186
187 nta++;
188 rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
189
190
191 *new_buff = *old_buff;
192
193
194 dma_sync_single_range_for_device(rx_ring->dev, old_buff->dma,
195 old_buff->page_offset,
196 FM10K_RX_BUFSZ,
197 DMA_FROM_DEVICE);
198}
199
200static inline bool fm10k_page_is_reserved(struct page *page)
201{
202 return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
203}
204
205static bool fm10k_can_reuse_rx_page(struct fm10k_rx_buffer *rx_buffer,
206 struct page *page,
207 unsigned int __maybe_unused truesize)
208{
209
210 if (unlikely(fm10k_page_is_reserved(page)))
211 return false;
212
213#if (PAGE_SIZE < 8192)
214
215 if (unlikely(page_count(page) != 1))
216 return false;
217
218
219 rx_buffer->page_offset ^= FM10K_RX_BUFSZ;
220#else
221
222 rx_buffer->page_offset += truesize;
223
224 if (rx_buffer->page_offset > (PAGE_SIZE - FM10K_RX_BUFSZ))
225 return false;
226#endif
227
228
229
230
231 page_ref_inc(page);
232
233 return true;
234}
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251static bool fm10k_add_rx_frag(struct fm10k_rx_buffer *rx_buffer,
252 unsigned int size,
253 union fm10k_rx_desc *rx_desc,
254 struct sk_buff *skb)
255{
256 struct page *page = rx_buffer->page;
257 unsigned char *va = page_address(page) + rx_buffer->page_offset;
258#if (PAGE_SIZE < 8192)
259 unsigned int truesize = FM10K_RX_BUFSZ;
260#else
261 unsigned int truesize = ALIGN(size, 512);
262#endif
263 unsigned int pull_len;
264
265 if (unlikely(skb_is_nonlinear(skb)))
266 goto add_tail_frag;
267
268 if (likely(size <= FM10K_RX_HDR_LEN)) {
269 memcpy(__skb_put(skb, size), va, ALIGN(size, sizeof(long)));
270
271
272 if (likely(!fm10k_page_is_reserved(page)))
273 return true;
274
275
276 __free_page(page);
277 return false;
278 }
279
280
281
282
283 pull_len = eth_get_headlen(skb->dev, va, FM10K_RX_HDR_LEN);
284
285
286 memcpy(__skb_put(skb, pull_len), va, ALIGN(pull_len, sizeof(long)));
287
288
289 va += pull_len;
290 size -= pull_len;
291
292add_tail_frag:
293 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
294 (unsigned long)va & ~PAGE_MASK, size, truesize);
295
296 return fm10k_can_reuse_rx_page(rx_buffer, page, truesize);
297}
298
299static struct sk_buff *fm10k_fetch_rx_buffer(struct fm10k_ring *rx_ring,
300 union fm10k_rx_desc *rx_desc,
301 struct sk_buff *skb)
302{
303 unsigned int size = le16_to_cpu(rx_desc->w.length);
304 struct fm10k_rx_buffer *rx_buffer;
305 struct page *page;
306
307 rx_buffer = &rx_ring->rx_buffer[rx_ring->next_to_clean];
308 page = rx_buffer->page;
309 prefetchw(page);
310
311 if (likely(!skb)) {
312 void *page_addr = page_address(page) +
313 rx_buffer->page_offset;
314
315
316 prefetch(page_addr);
317#if L1_CACHE_BYTES < 128
318 prefetch(page_addr + L1_CACHE_BYTES);
319#endif
320
321
322 skb = napi_alloc_skb(&rx_ring->q_vector->napi,
323 FM10K_RX_HDR_LEN);
324 if (unlikely(!skb)) {
325 rx_ring->rx_stats.alloc_failed++;
326 return NULL;
327 }
328
329
330
331
332
333 prefetchw(skb->data);
334 }
335
336
337 dma_sync_single_range_for_cpu(rx_ring->dev,
338 rx_buffer->dma,
339 rx_buffer->page_offset,
340 size,
341 DMA_FROM_DEVICE);
342
343
344 if (fm10k_add_rx_frag(rx_buffer, size, rx_desc, skb)) {
345
346 fm10k_reuse_rx_page(rx_ring, rx_buffer);
347 } else {
348
349 dma_unmap_page(rx_ring->dev, rx_buffer->dma,
350 PAGE_SIZE, DMA_FROM_DEVICE);
351 }
352
353
354 rx_buffer->page = NULL;
355
356 return skb;
357}
358
359static inline void fm10k_rx_checksum(struct fm10k_ring *ring,
360 union fm10k_rx_desc *rx_desc,
361 struct sk_buff *skb)
362{
363 skb_checksum_none_assert(skb);
364
365
366 if (!(ring->netdev->features & NETIF_F_RXCSUM))
367 return;
368
369
370 if (fm10k_test_staterr(rx_desc,
371 FM10K_RXD_STATUS_L4E |
372 FM10K_RXD_STATUS_L4E2 |
373 FM10K_RXD_STATUS_IPE |
374 FM10K_RXD_STATUS_IPE2)) {
375 ring->rx_stats.csum_err++;
376 return;
377 }
378
379
380 if (fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_L4CS2))
381 skb->encapsulation = true;
382 else if (!fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_L4CS))
383 return;
384
385 skb->ip_summed = CHECKSUM_UNNECESSARY;
386
387 ring->rx_stats.csum_good++;
388}
389
390#define FM10K_RSS_L4_TYPES_MASK \
391 (BIT(FM10K_RSSTYPE_IPV4_TCP) | \
392 BIT(FM10K_RSSTYPE_IPV4_UDP) | \
393 BIT(FM10K_RSSTYPE_IPV6_TCP) | \
394 BIT(FM10K_RSSTYPE_IPV6_UDP))
395
396static inline void fm10k_rx_hash(struct fm10k_ring *ring,
397 union fm10k_rx_desc *rx_desc,
398 struct sk_buff *skb)
399{
400 u16 rss_type;
401
402 if (!(ring->netdev->features & NETIF_F_RXHASH))
403 return;
404
405 rss_type = le16_to_cpu(rx_desc->w.pkt_info) & FM10K_RXD_RSSTYPE_MASK;
406 if (!rss_type)
407 return;
408
409 skb_set_hash(skb, le32_to_cpu(rx_desc->d.rss),
410 (BIT(rss_type) & FM10K_RSS_L4_TYPES_MASK) ?
411 PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
412}
413
414static void fm10k_type_trans(struct fm10k_ring *rx_ring,
415 union fm10k_rx_desc __maybe_unused *rx_desc,
416 struct sk_buff *skb)
417{
418 struct net_device *dev = rx_ring->netdev;
419 struct fm10k_l2_accel *l2_accel = rcu_dereference_bh(rx_ring->l2_accel);
420
421
422 if (l2_accel) {
423 u16 idx = le16_to_cpu(FM10K_CB(skb)->fi.w.dglort) - 1;
424
425 idx -= l2_accel->dglort;
426 if (idx < l2_accel->size && l2_accel->macvlan[idx])
427 dev = l2_accel->macvlan[idx];
428 else
429 l2_accel = NULL;
430 }
431
432
433 if (!l2_accel)
434 skb_record_rx_queue(skb, rx_ring->queue_index);
435 else
436 macvlan_count_rx(netdev_priv(dev), skb->len + ETH_HLEN, true,
437 false);
438
439 skb->protocol = eth_type_trans(skb, dev);
440}
441
442
443
444
445
446
447
448
449
450
451
452static unsigned int fm10k_process_skb_fields(struct fm10k_ring *rx_ring,
453 union fm10k_rx_desc *rx_desc,
454 struct sk_buff *skb)
455{
456 unsigned int len = skb->len;
457
458 fm10k_rx_hash(rx_ring, rx_desc, skb);
459
460 fm10k_rx_checksum(rx_ring, rx_desc, skb);
461
462 FM10K_CB(skb)->tstamp = rx_desc->q.timestamp;
463
464 FM10K_CB(skb)->fi.w.vlan = rx_desc->w.vlan;
465
466 FM10K_CB(skb)->fi.d.glort = rx_desc->d.glort;
467
468 if (rx_desc->w.vlan) {
469 u16 vid = le16_to_cpu(rx_desc->w.vlan);
470
471 if ((vid & VLAN_VID_MASK) != rx_ring->vid)
472 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
473 else if (vid & VLAN_PRIO_MASK)
474 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
475 vid & VLAN_PRIO_MASK);
476 }
477
478 fm10k_type_trans(rx_ring, rx_desc, skb);
479
480 return len;
481}
482
483
484
485
486
487
488
489
490
491
492
493static bool fm10k_is_non_eop(struct fm10k_ring *rx_ring,
494 union fm10k_rx_desc *rx_desc)
495{
496 u32 ntc = rx_ring->next_to_clean + 1;
497
498
499 ntc = (ntc < rx_ring->count) ? ntc : 0;
500 rx_ring->next_to_clean = ntc;
501
502 prefetch(FM10K_RX_DESC(rx_ring, ntc));
503
504 if (likely(fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_EOP)))
505 return false;
506
507 return true;
508}
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524static bool fm10k_cleanup_headers(struct fm10k_ring *rx_ring,
525 union fm10k_rx_desc *rx_desc,
526 struct sk_buff *skb)
527{
528 if (unlikely((fm10k_test_staterr(rx_desc,
529 FM10K_RXD_STATUS_RXE)))) {
530#define FM10K_TEST_RXD_BIT(rxd, bit) \
531 ((rxd)->w.csum_err & cpu_to_le16(bit))
532 if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_SWITCH_ERROR))
533 rx_ring->rx_stats.switch_errors++;
534 if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_NO_DESCRIPTOR))
535 rx_ring->rx_stats.drops++;
536 if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_PP_ERROR))
537 rx_ring->rx_stats.pp_errors++;
538 if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_SWITCH_READY))
539 rx_ring->rx_stats.link_errors++;
540 if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_TOO_BIG))
541 rx_ring->rx_stats.length_errors++;
542 dev_kfree_skb_any(skb);
543 rx_ring->rx_stats.errors++;
544 return true;
545 }
546
547
548 if (eth_skb_pad(skb))
549 return true;
550
551 return false;
552}
553
554
555
556
557
558
559static void fm10k_receive_skb(struct fm10k_q_vector *q_vector,
560 struct sk_buff *skb)
561{
562 napi_gro_receive(&q_vector->napi, skb);
563}
564
565static int fm10k_clean_rx_irq(struct fm10k_q_vector *q_vector,
566 struct fm10k_ring *rx_ring,
567 int budget)
568{
569 struct sk_buff *skb = rx_ring->skb;
570 unsigned int total_bytes = 0, total_packets = 0;
571 u16 cleaned_count = fm10k_desc_unused(rx_ring);
572
573 while (likely(total_packets < budget)) {
574 union fm10k_rx_desc *rx_desc;
575
576
577 if (cleaned_count >= FM10K_RX_BUFFER_WRITE) {
578 fm10k_alloc_rx_buffers(rx_ring, cleaned_count);
579 cleaned_count = 0;
580 }
581
582 rx_desc = FM10K_RX_DESC(rx_ring, rx_ring->next_to_clean);
583
584 if (!rx_desc->d.staterr)
585 break;
586
587
588
589
590
591 dma_rmb();
592
593
594 skb = fm10k_fetch_rx_buffer(rx_ring, rx_desc, skb);
595
596
597 if (!skb)
598 break;
599
600 cleaned_count++;
601
602
603 if (fm10k_is_non_eop(rx_ring, rx_desc))
604 continue;
605
606
607 if (fm10k_cleanup_headers(rx_ring, rx_desc, skb)) {
608 skb = NULL;
609 continue;
610 }
611
612
613 total_bytes += fm10k_process_skb_fields(rx_ring, rx_desc, skb);
614
615 fm10k_receive_skb(q_vector, skb);
616
617
618 skb = NULL;
619
620
621 total_packets++;
622 }
623
624
625 rx_ring->skb = skb;
626
627 u64_stats_update_begin(&rx_ring->syncp);
628 rx_ring->stats.packets += total_packets;
629 rx_ring->stats.bytes += total_bytes;
630 u64_stats_update_end(&rx_ring->syncp);
631 q_vector->rx.total_packets += total_packets;
632 q_vector->rx.total_bytes += total_bytes;
633
634 return total_packets;
635}
636
637#define VXLAN_HLEN (sizeof(struct udphdr) + 8)
638static struct ethhdr *fm10k_port_is_vxlan(struct sk_buff *skb)
639{
640 struct fm10k_intfc *interface = netdev_priv(skb->dev);
641 struct fm10k_udp_port *vxlan_port;
642
643
644 vxlan_port = list_first_entry_or_null(&interface->vxlan_port,
645 struct fm10k_udp_port, list);
646
647 if (!vxlan_port)
648 return NULL;
649 if (vxlan_port->port != udp_hdr(skb)->dest)
650 return NULL;
651
652
653 return (struct ethhdr *)(skb_transport_header(skb) + VXLAN_HLEN);
654}
655
656#define FM10K_NVGRE_RESERVED0_FLAGS htons(0x9FFF)
657#define NVGRE_TNI htons(0x2000)
658struct fm10k_nvgre_hdr {
659 __be16 flags;
660 __be16 proto;
661 __be32 tni;
662};
663
664static struct ethhdr *fm10k_gre_is_nvgre(struct sk_buff *skb)
665{
666 struct fm10k_nvgre_hdr *nvgre_hdr;
667 int hlen = ip_hdrlen(skb);
668
669
670 if (vlan_get_protocol(skb) != htons(ETH_P_IP))
671 return NULL;
672
673
674 nvgre_hdr = (struct fm10k_nvgre_hdr *)(skb_network_header(skb) + hlen);
675
676
677 if (nvgre_hdr->flags & FM10K_NVGRE_RESERVED0_FLAGS)
678 return NULL;
679
680
681 if (nvgre_hdr->flags & NVGRE_TNI)
682 return (struct ethhdr *)(nvgre_hdr + 1);
683
684 return (struct ethhdr *)(&nvgre_hdr->tni);
685}
686
687__be16 fm10k_tx_encap_offload(struct sk_buff *skb)
688{
689 u8 l4_hdr = 0, inner_l4_hdr = 0, inner_l4_hlen;
690 struct ethhdr *eth_hdr;
691
692 if (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
693 skb->inner_protocol != htons(ETH_P_TEB))
694 return 0;
695
696 switch (vlan_get_protocol(skb)) {
697 case htons(ETH_P_IP):
698 l4_hdr = ip_hdr(skb)->protocol;
699 break;
700 case htons(ETH_P_IPV6):
701 l4_hdr = ipv6_hdr(skb)->nexthdr;
702 break;
703 default:
704 return 0;
705 }
706
707 switch (l4_hdr) {
708 case IPPROTO_UDP:
709 eth_hdr = fm10k_port_is_vxlan(skb);
710 break;
711 case IPPROTO_GRE:
712 eth_hdr = fm10k_gre_is_nvgre(skb);
713 break;
714 default:
715 return 0;
716 }
717
718 if (!eth_hdr)
719 return 0;
720
721 switch (eth_hdr->h_proto) {
722 case htons(ETH_P_IP):
723 inner_l4_hdr = inner_ip_hdr(skb)->protocol;
724 break;
725 case htons(ETH_P_IPV6):
726 inner_l4_hdr = inner_ipv6_hdr(skb)->nexthdr;
727 break;
728 default:
729 return 0;
730 }
731
732 switch (inner_l4_hdr) {
733 case IPPROTO_TCP:
734 inner_l4_hlen = inner_tcp_hdrlen(skb);
735 break;
736 case IPPROTO_UDP:
737 inner_l4_hlen = 8;
738 break;
739 default:
740 return 0;
741 }
742
743
744
745
746 if (skb_inner_transport_header(skb) + inner_l4_hlen -
747 skb_mac_header(skb) > FM10K_TUNNEL_HEADER_LENGTH)
748 return 0;
749
750 return eth_hdr->h_proto;
751}
752
753static int fm10k_tso(struct fm10k_ring *tx_ring,
754 struct fm10k_tx_buffer *first)
755{
756 struct sk_buff *skb = first->skb;
757 struct fm10k_tx_desc *tx_desc;
758 unsigned char *th;
759 u8 hdrlen;
760
761 if (skb->ip_summed != CHECKSUM_PARTIAL)
762 return 0;
763
764 if (!skb_is_gso(skb))
765 return 0;
766
767
768 if (skb->encapsulation) {
769 if (!fm10k_tx_encap_offload(skb))
770 goto err_vxlan;
771 th = skb_inner_transport_header(skb);
772 } else {
773 th = skb_transport_header(skb);
774 }
775
776
777 hdrlen = (th - skb->data) + (((struct tcphdr *)th)->doff << 2);
778
779 first->tx_flags |= FM10K_TX_FLAGS_CSUM;
780
781
782 first->gso_segs = skb_shinfo(skb)->gso_segs;
783 first->bytecount += (first->gso_segs - 1) * hdrlen;
784
785
786 tx_desc = FM10K_TX_DESC(tx_ring, tx_ring->next_to_use);
787 tx_desc->hdrlen = hdrlen;
788 tx_desc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
789
790 return 1;
791
792err_vxlan:
793 tx_ring->netdev->features &= ~NETIF_F_GSO_UDP_TUNNEL;
794 if (net_ratelimit())
795 netdev_err(tx_ring->netdev,
796 "TSO requested for unsupported tunnel, disabling offload\n");
797 return -1;
798}
799
800static void fm10k_tx_csum(struct fm10k_ring *tx_ring,
801 struct fm10k_tx_buffer *first)
802{
803 struct sk_buff *skb = first->skb;
804 struct fm10k_tx_desc *tx_desc;
805 union {
806 struct iphdr *ipv4;
807 struct ipv6hdr *ipv6;
808 u8 *raw;
809 } network_hdr;
810 u8 *transport_hdr;
811 __be16 frag_off;
812 __be16 protocol;
813 u8 l4_hdr = 0;
814
815 if (skb->ip_summed != CHECKSUM_PARTIAL)
816 goto no_csum;
817
818 if (skb->encapsulation) {
819 protocol = fm10k_tx_encap_offload(skb);
820 if (!protocol) {
821 if (skb_checksum_help(skb)) {
822 dev_warn(tx_ring->dev,
823 "failed to offload encap csum!\n");
824 tx_ring->tx_stats.csum_err++;
825 }
826 goto no_csum;
827 }
828 network_hdr.raw = skb_inner_network_header(skb);
829 transport_hdr = skb_inner_transport_header(skb);
830 } else {
831 protocol = vlan_get_protocol(skb);
832 network_hdr.raw = skb_network_header(skb);
833 transport_hdr = skb_transport_header(skb);
834 }
835
836 switch (protocol) {
837 case htons(ETH_P_IP):
838 l4_hdr = network_hdr.ipv4->protocol;
839 break;
840 case htons(ETH_P_IPV6):
841 l4_hdr = network_hdr.ipv6->nexthdr;
842 if (likely((transport_hdr - network_hdr.raw) ==
843 sizeof(struct ipv6hdr)))
844 break;
845 ipv6_skip_exthdr(skb, network_hdr.raw - skb->data +
846 sizeof(struct ipv6hdr),
847 &l4_hdr, &frag_off);
848 if (unlikely(frag_off))
849 l4_hdr = NEXTHDR_FRAGMENT;
850 break;
851 default:
852 break;
853 }
854
855 switch (l4_hdr) {
856 case IPPROTO_TCP:
857 case IPPROTO_UDP:
858 break;
859 case IPPROTO_GRE:
860 if (skb->encapsulation)
861 break;
862
863 default:
864 if (unlikely(net_ratelimit())) {
865 dev_warn(tx_ring->dev,
866 "partial checksum, version=%d l4 proto=%x\n",
867 protocol, l4_hdr);
868 }
869 skb_checksum_help(skb);
870 tx_ring->tx_stats.csum_err++;
871 goto no_csum;
872 }
873
874
875 first->tx_flags |= FM10K_TX_FLAGS_CSUM;
876 tx_ring->tx_stats.csum_good++;
877
878no_csum:
879
880 tx_desc = FM10K_TX_DESC(tx_ring, tx_ring->next_to_use);
881 tx_desc->hdrlen = 0;
882 tx_desc->mss = 0;
883}
884
885#define FM10K_SET_FLAG(_input, _flag, _result) \
886 ((_flag <= _result) ? \
887 ((u32)(_input & _flag) * (_result / _flag)) : \
888 ((u32)(_input & _flag) / (_flag / _result)))
889
890static u8 fm10k_tx_desc_flags(struct sk_buff *skb, u32 tx_flags)
891{
892
893 u32 desc_flags = 0;
894
895
896 desc_flags |= FM10K_SET_FLAG(tx_flags, FM10K_TX_FLAGS_CSUM,
897 FM10K_TXD_FLAG_CSUM);
898
899 return desc_flags;
900}
901
902static bool fm10k_tx_desc_push(struct fm10k_ring *tx_ring,
903 struct fm10k_tx_desc *tx_desc, u16 i,
904 dma_addr_t dma, unsigned int size, u8 desc_flags)
905{
906
907 if ((++i & (FM10K_TXD_WB_FIFO_SIZE - 1)) == 0)
908 desc_flags |= FM10K_TXD_FLAG_RS | FM10K_TXD_FLAG_INT;
909
910
911 tx_desc->buffer_addr = cpu_to_le64(dma);
912 tx_desc->flags = desc_flags;
913 tx_desc->buflen = cpu_to_le16(size);
914
915
916 return i == tx_ring->count;
917}
918
919static int __fm10k_maybe_stop_tx(struct fm10k_ring *tx_ring, u16 size)
920{
921 netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
922
923
924 smp_mb();
925
926
927 if (likely(fm10k_desc_unused(tx_ring) < size))
928 return -EBUSY;
929
930
931 netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index);
932 ++tx_ring->tx_stats.restart_queue;
933 return 0;
934}
935
936static inline int fm10k_maybe_stop_tx(struct fm10k_ring *tx_ring, u16 size)
937{
938 if (likely(fm10k_desc_unused(tx_ring) >= size))
939 return 0;
940 return __fm10k_maybe_stop_tx(tx_ring, size);
941}
942
943static void fm10k_tx_map(struct fm10k_ring *tx_ring,
944 struct fm10k_tx_buffer *first)
945{
946 struct sk_buff *skb = first->skb;
947 struct fm10k_tx_buffer *tx_buffer;
948 struct fm10k_tx_desc *tx_desc;
949 struct skb_frag_struct *frag;
950 unsigned char *data;
951 dma_addr_t dma;
952 unsigned int data_len, size;
953 u32 tx_flags = first->tx_flags;
954 u16 i = tx_ring->next_to_use;
955 u8 flags = fm10k_tx_desc_flags(skb, tx_flags);
956
957 tx_desc = FM10K_TX_DESC(tx_ring, i);
958
959
960 if (skb_vlan_tag_present(skb))
961 tx_desc->vlan = cpu_to_le16(skb_vlan_tag_get(skb));
962 else
963 tx_desc->vlan = 0;
964
965 size = skb_headlen(skb);
966 data = skb->data;
967
968 dma = dma_map_single(tx_ring->dev, data, size, DMA_TO_DEVICE);
969
970 data_len = skb->data_len;
971 tx_buffer = first;
972
973 for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
974 if (dma_mapping_error(tx_ring->dev, dma))
975 goto dma_error;
976
977
978 dma_unmap_len_set(tx_buffer, len, size);
979 dma_unmap_addr_set(tx_buffer, dma, dma);
980
981 while (unlikely(size > FM10K_MAX_DATA_PER_TXD)) {
982 if (fm10k_tx_desc_push(tx_ring, tx_desc++, i++, dma,
983 FM10K_MAX_DATA_PER_TXD, flags)) {
984 tx_desc = FM10K_TX_DESC(tx_ring, 0);
985 i = 0;
986 }
987
988 dma += FM10K_MAX_DATA_PER_TXD;
989 size -= FM10K_MAX_DATA_PER_TXD;
990 }
991
992 if (likely(!data_len))
993 break;
994
995 if (fm10k_tx_desc_push(tx_ring, tx_desc++, i++,
996 dma, size, flags)) {
997 tx_desc = FM10K_TX_DESC(tx_ring, 0);
998 i = 0;
999 }
1000
1001 size = skb_frag_size(frag);
1002 data_len -= size;
1003
1004 dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
1005 DMA_TO_DEVICE);
1006
1007 tx_buffer = &tx_ring->tx_buffer[i];
1008 }
1009
1010
1011 flags |= FM10K_TXD_FLAG_LAST;
1012
1013 if (fm10k_tx_desc_push(tx_ring, tx_desc, i++, dma, size, flags))
1014 i = 0;
1015
1016
1017 netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount);
1018
1019
1020 skb_tx_timestamp(first->skb);
1021
1022
1023
1024
1025
1026
1027
1028
1029 wmb();
1030
1031
1032 first->next_to_watch = tx_desc;
1033
1034 tx_ring->next_to_use = i;
1035
1036
1037 fm10k_maybe_stop_tx(tx_ring, DESC_NEEDED);
1038
1039
1040 if (netif_xmit_stopped(txring_txq(tx_ring)) || !netdev_xmit_more()) {
1041 writel(i, tx_ring->tail);
1042 }
1043
1044 return;
1045dma_error:
1046 dev_err(tx_ring->dev, "TX DMA map failed\n");
1047
1048
1049 for (;;) {
1050 tx_buffer = &tx_ring->tx_buffer[i];
1051 fm10k_unmap_and_free_tx_resource(tx_ring, tx_buffer);
1052 if (tx_buffer == first)
1053 break;
1054 if (i == 0)
1055 i = tx_ring->count;
1056 i--;
1057 }
1058
1059 tx_ring->next_to_use = i;
1060}
1061
1062netdev_tx_t fm10k_xmit_frame_ring(struct sk_buff *skb,
1063 struct fm10k_ring *tx_ring)
1064{
1065 u16 count = TXD_USE_COUNT(skb_headlen(skb));
1066 struct fm10k_tx_buffer *first;
1067 unsigned short f;
1068 u32 tx_flags = 0;
1069 int tso;
1070
1071
1072
1073
1074
1075
1076 for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
1077 count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
1078
1079 if (fm10k_maybe_stop_tx(tx_ring, count + 3)) {
1080 tx_ring->tx_stats.tx_busy++;
1081 return NETDEV_TX_BUSY;
1082 }
1083
1084
1085 first = &tx_ring->tx_buffer[tx_ring->next_to_use];
1086 first->skb = skb;
1087 first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN);
1088 first->gso_segs = 1;
1089
1090
1091 first->tx_flags = tx_flags;
1092
1093 tso = fm10k_tso(tx_ring, first);
1094 if (tso < 0)
1095 goto out_drop;
1096 else if (!tso)
1097 fm10k_tx_csum(tx_ring, first);
1098
1099 fm10k_tx_map(tx_ring, first);
1100
1101 return NETDEV_TX_OK;
1102
1103out_drop:
1104 dev_kfree_skb_any(first->skb);
1105 first->skb = NULL;
1106
1107 return NETDEV_TX_OK;
1108}
1109
1110static u64 fm10k_get_tx_completed(struct fm10k_ring *ring)
1111{
1112 return ring->stats.packets;
1113}
1114
1115
1116
1117
1118
1119
1120u64 fm10k_get_tx_pending(struct fm10k_ring *ring, bool in_sw)
1121{
1122 struct fm10k_intfc *interface = ring->q_vector->interface;
1123 struct fm10k_hw *hw = &interface->hw;
1124 u32 head, tail;
1125
1126 if (likely(in_sw)) {
1127 head = ring->next_to_clean;
1128 tail = ring->next_to_use;
1129 } else {
1130 head = fm10k_read_reg(hw, FM10K_TDH(ring->reg_idx));
1131 tail = fm10k_read_reg(hw, FM10K_TDT(ring->reg_idx));
1132 }
1133
1134 return ((head <= tail) ? tail : tail + ring->count) - head;
1135}
1136
1137bool fm10k_check_tx_hang(struct fm10k_ring *tx_ring)
1138{
1139 u32 tx_done = fm10k_get_tx_completed(tx_ring);
1140 u32 tx_done_old = tx_ring->tx_stats.tx_done_old;
1141 u32 tx_pending = fm10k_get_tx_pending(tx_ring, true);
1142
1143 clear_check_for_tx_hang(tx_ring);
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153 if (!tx_pending || (tx_done_old != tx_done)) {
1154
1155 tx_ring->tx_stats.tx_done_old = tx_done;
1156
1157 clear_bit(__FM10K_HANG_CHECK_ARMED, tx_ring->state);
1158
1159 return false;
1160 }
1161
1162
1163 return test_and_set_bit(__FM10K_HANG_CHECK_ARMED, tx_ring->state);
1164}
1165
1166
1167
1168
1169
1170void fm10k_tx_timeout_reset(struct fm10k_intfc *interface)
1171{
1172
1173 if (!test_bit(__FM10K_DOWN, interface->state)) {
1174 interface->tx_timeout_count++;
1175 set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
1176 fm10k_service_event_schedule(interface);
1177 }
1178}
1179
1180
1181
1182
1183
1184
1185
1186static bool fm10k_clean_tx_irq(struct fm10k_q_vector *q_vector,
1187 struct fm10k_ring *tx_ring, int napi_budget)
1188{
1189 struct fm10k_intfc *interface = q_vector->interface;
1190 struct fm10k_tx_buffer *tx_buffer;
1191 struct fm10k_tx_desc *tx_desc;
1192 unsigned int total_bytes = 0, total_packets = 0;
1193 unsigned int budget = q_vector->tx.work_limit;
1194 unsigned int i = tx_ring->next_to_clean;
1195
1196 if (test_bit(__FM10K_DOWN, interface->state))
1197 return true;
1198
1199 tx_buffer = &tx_ring->tx_buffer[i];
1200 tx_desc = FM10K_TX_DESC(tx_ring, i);
1201 i -= tx_ring->count;
1202
1203 do {
1204 struct fm10k_tx_desc *eop_desc = tx_buffer->next_to_watch;
1205
1206
1207 if (!eop_desc)
1208 break;
1209
1210
1211 smp_rmb();
1212
1213
1214 if (!(eop_desc->flags & FM10K_TXD_FLAG_DONE))
1215 break;
1216
1217
1218 tx_buffer->next_to_watch = NULL;
1219
1220
1221 total_bytes += tx_buffer->bytecount;
1222 total_packets += tx_buffer->gso_segs;
1223
1224
1225 napi_consume_skb(tx_buffer->skb, napi_budget);
1226
1227
1228 dma_unmap_single(tx_ring->dev,
1229 dma_unmap_addr(tx_buffer, dma),
1230 dma_unmap_len(tx_buffer, len),
1231 DMA_TO_DEVICE);
1232
1233
1234 tx_buffer->skb = NULL;
1235 dma_unmap_len_set(tx_buffer, len, 0);
1236
1237
1238 while (tx_desc != eop_desc) {
1239 tx_buffer++;
1240 tx_desc++;
1241 i++;
1242 if (unlikely(!i)) {
1243 i -= tx_ring->count;
1244 tx_buffer = tx_ring->tx_buffer;
1245 tx_desc = FM10K_TX_DESC(tx_ring, 0);
1246 }
1247
1248
1249 if (dma_unmap_len(tx_buffer, len)) {
1250 dma_unmap_page(tx_ring->dev,
1251 dma_unmap_addr(tx_buffer, dma),
1252 dma_unmap_len(tx_buffer, len),
1253 DMA_TO_DEVICE);
1254 dma_unmap_len_set(tx_buffer, len, 0);
1255 }
1256 }
1257
1258
1259 tx_buffer++;
1260 tx_desc++;
1261 i++;
1262 if (unlikely(!i)) {
1263 i -= tx_ring->count;
1264 tx_buffer = tx_ring->tx_buffer;
1265 tx_desc = FM10K_TX_DESC(tx_ring, 0);
1266 }
1267
1268
1269 prefetch(tx_desc);
1270
1271
1272 budget--;
1273 } while (likely(budget));
1274
1275 i += tx_ring->count;
1276 tx_ring->next_to_clean = i;
1277 u64_stats_update_begin(&tx_ring->syncp);
1278 tx_ring->stats.bytes += total_bytes;
1279 tx_ring->stats.packets += total_packets;
1280 u64_stats_update_end(&tx_ring->syncp);
1281 q_vector->tx.total_bytes += total_bytes;
1282 q_vector->tx.total_packets += total_packets;
1283
1284 if (check_for_tx_hang(tx_ring) && fm10k_check_tx_hang(tx_ring)) {
1285
1286 struct fm10k_hw *hw = &interface->hw;
1287
1288 netif_err(interface, drv, tx_ring->netdev,
1289 "Detected Tx Unit Hang\n"
1290 " Tx Queue <%d>\n"
1291 " TDH, TDT <%x>, <%x>\n"
1292 " next_to_use <%x>\n"
1293 " next_to_clean <%x>\n",
1294 tx_ring->queue_index,
1295 fm10k_read_reg(hw, FM10K_TDH(tx_ring->reg_idx)),
1296 fm10k_read_reg(hw, FM10K_TDT(tx_ring->reg_idx)),
1297 tx_ring->next_to_use, i);
1298
1299 netif_stop_subqueue(tx_ring->netdev,
1300 tx_ring->queue_index);
1301
1302 netif_info(interface, probe, tx_ring->netdev,
1303 "tx hang %d detected on queue %d, resetting interface\n",
1304 interface->tx_timeout_count + 1,
1305 tx_ring->queue_index);
1306
1307 fm10k_tx_timeout_reset(interface);
1308
1309
1310 return true;
1311 }
1312
1313
1314 netdev_tx_completed_queue(txring_txq(tx_ring),
1315 total_packets, total_bytes);
1316
1317#define TX_WAKE_THRESHOLD min_t(u16, FM10K_MIN_TXD - 1, DESC_NEEDED * 2)
1318 if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) &&
1319 (fm10k_desc_unused(tx_ring) >= TX_WAKE_THRESHOLD))) {
1320
1321
1322
1323 smp_mb();
1324 if (__netif_subqueue_stopped(tx_ring->netdev,
1325 tx_ring->queue_index) &&
1326 !test_bit(__FM10K_DOWN, interface->state)) {
1327 netif_wake_subqueue(tx_ring->netdev,
1328 tx_ring->queue_index);
1329 ++tx_ring->tx_stats.restart_queue;
1330 }
1331 }
1332
1333 return !!budget;
1334}
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346static void fm10k_update_itr(struct fm10k_ring_container *ring_container)
1347{
1348 unsigned int avg_wire_size, packets, itr_round;
1349
1350
1351 if (!ITR_IS_ADAPTIVE(ring_container->itr))
1352 goto clear_counts;
1353
1354 packets = ring_container->total_packets;
1355 if (!packets)
1356 goto clear_counts;
1357
1358 avg_wire_size = ring_container->total_bytes / packets;
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375 if (avg_wire_size <= 360) {
1376
1377 avg_wire_size *= 8;
1378 avg_wire_size += 376;
1379 } else if (avg_wire_size <= 1152) {
1380
1381 avg_wire_size *= 3;
1382 avg_wire_size += 2176;
1383 } else if (avg_wire_size <= 1920) {
1384
1385 avg_wire_size += 4480;
1386 } else {
1387
1388 avg_wire_size = 6656;
1389 }
1390
1391
1392
1393
1394
1395 itr_round = READ_ONCE(ring_container->itr_scale) + 8;
1396 avg_wire_size += BIT(itr_round) - 1;
1397 avg_wire_size >>= itr_round;
1398
1399
1400 ring_container->itr = avg_wire_size | FM10K_ITR_ADAPTIVE;
1401
1402clear_counts:
1403 ring_container->total_bytes = 0;
1404 ring_container->total_packets = 0;
1405}
1406
1407static void fm10k_qv_enable(struct fm10k_q_vector *q_vector)
1408{
1409
1410 u32 itr = FM10K_ITR_ENABLE;
1411
1412
1413 fm10k_update_itr(&q_vector->tx);
1414
1415
1416 fm10k_update_itr(&q_vector->rx);
1417
1418
1419 itr |= (q_vector->tx.itr & FM10K_ITR_MAX);
1420
1421
1422 itr |= (q_vector->rx.itr & FM10K_ITR_MAX) << FM10K_ITR_INTERVAL1_SHIFT;
1423
1424
1425 writel(itr, q_vector->itr);
1426}
1427
1428static int fm10k_poll(struct napi_struct *napi, int budget)
1429{
1430 struct fm10k_q_vector *q_vector =
1431 container_of(napi, struct fm10k_q_vector, napi);
1432 struct fm10k_ring *ring;
1433 int per_ring_budget, work_done = 0;
1434 bool clean_complete = true;
1435
1436 fm10k_for_each_ring(ring, q_vector->tx) {
1437 if (!fm10k_clean_tx_irq(q_vector, ring, budget))
1438 clean_complete = false;
1439 }
1440
1441
1442 if (budget <= 0)
1443 return budget;
1444
1445
1446
1447
1448 if (q_vector->rx.count > 1)
1449 per_ring_budget = max(budget / q_vector->rx.count, 1);
1450 else
1451 per_ring_budget = budget;
1452
1453 fm10k_for_each_ring(ring, q_vector->rx) {
1454 int work = fm10k_clean_rx_irq(q_vector, ring, per_ring_budget);
1455
1456 work_done += work;
1457 if (work >= per_ring_budget)
1458 clean_complete = false;
1459 }
1460
1461
1462 if (!clean_complete)
1463 return budget;
1464
1465
1466
1467
1468 if (likely(napi_complete_done(napi, work_done)))
1469 fm10k_qv_enable(q_vector);
1470
1471 return min(work_done, budget - 1);
1472}
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485static bool fm10k_set_qos_queues(struct fm10k_intfc *interface)
1486{
1487 struct net_device *dev = interface->netdev;
1488 struct fm10k_ring_feature *f;
1489 int rss_i, i;
1490 int pcs;
1491
1492
1493 pcs = netdev_get_num_tc(dev);
1494
1495 if (pcs <= 1)
1496 return false;
1497
1498
1499 f = &interface->ring_feature[RING_F_QOS];
1500 f->indices = pcs;
1501 f->mask = BIT(fls(pcs - 1)) - 1;
1502
1503
1504 rss_i = interface->hw.mac.max_queues / pcs;
1505 rss_i = BIT(fls(rss_i) - 1);
1506
1507
1508 f = &interface->ring_feature[RING_F_RSS];
1509 rss_i = min_t(u16, rss_i, f->limit);
1510 f->indices = rss_i;
1511 f->mask = BIT(fls(rss_i - 1)) - 1;
1512
1513
1514 for (i = 0; i < pcs; i++)
1515 netdev_set_tc_queue(dev, i, rss_i, rss_i * i);
1516
1517 interface->num_rx_queues = rss_i * pcs;
1518 interface->num_tx_queues = rss_i * pcs;
1519
1520 return true;
1521}
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531static bool fm10k_set_rss_queues(struct fm10k_intfc *interface)
1532{
1533 struct fm10k_ring_feature *f;
1534 u16 rss_i;
1535
1536 f = &interface->ring_feature[RING_F_RSS];
1537 rss_i = min_t(u16, interface->hw.mac.max_queues, f->limit);
1538
1539
1540 f->indices = rss_i;
1541 f->mask = BIT(fls(rss_i - 1)) - 1;
1542
1543 interface->num_rx_queues = rss_i;
1544 interface->num_tx_queues = rss_i;
1545
1546 return true;
1547}
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560static void fm10k_set_num_queues(struct fm10k_intfc *interface)
1561{
1562
1563 if (fm10k_set_qos_queues(interface))
1564 return;
1565
1566
1567 fm10k_set_rss_queues(interface);
1568}
1569
1570
1571
1572
1573
1574
1575
1576
1577static void fm10k_reset_num_queues(struct fm10k_intfc *interface)
1578{
1579 interface->num_tx_queues = 0;
1580 interface->num_rx_queues = 0;
1581 interface->num_q_vectors = 0;
1582}
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596static int fm10k_alloc_q_vector(struct fm10k_intfc *interface,
1597 unsigned int v_count, unsigned int v_idx,
1598 unsigned int txr_count, unsigned int txr_idx,
1599 unsigned int rxr_count, unsigned int rxr_idx)
1600{
1601 struct fm10k_q_vector *q_vector;
1602 struct fm10k_ring *ring;
1603 int ring_count;
1604
1605 ring_count = txr_count + rxr_count;
1606
1607
1608 q_vector = kzalloc(struct_size(q_vector, ring, ring_count), GFP_KERNEL);
1609 if (!q_vector)
1610 return -ENOMEM;
1611
1612
1613 netif_napi_add(interface->netdev, &q_vector->napi,
1614 fm10k_poll, NAPI_POLL_WEIGHT);
1615
1616
1617 interface->q_vector[v_idx] = q_vector;
1618 q_vector->interface = interface;
1619 q_vector->v_idx = v_idx;
1620
1621
1622 ring = q_vector->ring;
1623
1624
1625 q_vector->tx.ring = ring;
1626 q_vector->tx.work_limit = FM10K_DEFAULT_TX_WORK;
1627 q_vector->tx.itr = interface->tx_itr;
1628 q_vector->tx.itr_scale = interface->hw.mac.itr_scale;
1629 q_vector->tx.count = txr_count;
1630
1631 while (txr_count) {
1632
1633 ring->dev = &interface->pdev->dev;
1634 ring->netdev = interface->netdev;
1635
1636
1637 ring->q_vector = q_vector;
1638
1639
1640 ring->count = interface->tx_ring_count;
1641 ring->queue_index = txr_idx;
1642
1643
1644 interface->tx_ring[txr_idx] = ring;
1645
1646
1647 txr_count--;
1648 txr_idx += v_count;
1649
1650
1651 ring++;
1652 }
1653
1654
1655 q_vector->rx.ring = ring;
1656 q_vector->rx.itr = interface->rx_itr;
1657 q_vector->rx.itr_scale = interface->hw.mac.itr_scale;
1658 q_vector->rx.count = rxr_count;
1659
1660 while (rxr_count) {
1661
1662 ring->dev = &interface->pdev->dev;
1663 ring->netdev = interface->netdev;
1664 rcu_assign_pointer(ring->l2_accel, interface->l2_accel);
1665
1666
1667 ring->q_vector = q_vector;
1668
1669
1670 ring->count = interface->rx_ring_count;
1671 ring->queue_index = rxr_idx;
1672
1673
1674 interface->rx_ring[rxr_idx] = ring;
1675
1676
1677 rxr_count--;
1678 rxr_idx += v_count;
1679
1680
1681 ring++;
1682 }
1683
1684 fm10k_dbg_q_vector_init(q_vector);
1685
1686 return 0;
1687}
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698static void fm10k_free_q_vector(struct fm10k_intfc *interface, int v_idx)
1699{
1700 struct fm10k_q_vector *q_vector = interface->q_vector[v_idx];
1701 struct fm10k_ring *ring;
1702
1703 fm10k_dbg_q_vector_exit(q_vector);
1704
1705 fm10k_for_each_ring(ring, q_vector->tx)
1706 interface->tx_ring[ring->queue_index] = NULL;
1707
1708 fm10k_for_each_ring(ring, q_vector->rx)
1709 interface->rx_ring[ring->queue_index] = NULL;
1710
1711 interface->q_vector[v_idx] = NULL;
1712 netif_napi_del(&q_vector->napi);
1713 kfree_rcu(q_vector, rcu);
1714}
1715
1716
1717
1718
1719
1720
1721
1722
1723static int fm10k_alloc_q_vectors(struct fm10k_intfc *interface)
1724{
1725 unsigned int q_vectors = interface->num_q_vectors;
1726 unsigned int rxr_remaining = interface->num_rx_queues;
1727 unsigned int txr_remaining = interface->num_tx_queues;
1728 unsigned int rxr_idx = 0, txr_idx = 0, v_idx = 0;
1729 int err;
1730
1731 if (q_vectors >= (rxr_remaining + txr_remaining)) {
1732 for (; rxr_remaining; v_idx++) {
1733 err = fm10k_alloc_q_vector(interface, q_vectors, v_idx,
1734 0, 0, 1, rxr_idx);
1735 if (err)
1736 goto err_out;
1737
1738
1739 rxr_remaining--;
1740 rxr_idx++;
1741 }
1742 }
1743
1744 for (; v_idx < q_vectors; v_idx++) {
1745 int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - v_idx);
1746 int tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - v_idx);
1747
1748 err = fm10k_alloc_q_vector(interface, q_vectors, v_idx,
1749 tqpv, txr_idx,
1750 rqpv, rxr_idx);
1751
1752 if (err)
1753 goto err_out;
1754
1755
1756 rxr_remaining -= rqpv;
1757 txr_remaining -= tqpv;
1758 rxr_idx++;
1759 txr_idx++;
1760 }
1761
1762 return 0;
1763
1764err_out:
1765 fm10k_reset_num_queues(interface);
1766
1767 while (v_idx--)
1768 fm10k_free_q_vector(interface, v_idx);
1769
1770 return -ENOMEM;
1771}
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781static void fm10k_free_q_vectors(struct fm10k_intfc *interface)
1782{
1783 int v_idx = interface->num_q_vectors;
1784
1785 fm10k_reset_num_queues(interface);
1786
1787 while (v_idx--)
1788 fm10k_free_q_vector(interface, v_idx);
1789}
1790
1791
1792
1793
1794
1795
1796
1797static void fm10k_reset_msix_capability(struct fm10k_intfc *interface)
1798{
1799 pci_disable_msix(interface->pdev);
1800 kfree(interface->msix_entries);
1801 interface->msix_entries = NULL;
1802}
1803
1804
1805
1806
1807
1808
1809
1810
1811static int fm10k_init_msix_capability(struct fm10k_intfc *interface)
1812{
1813 struct fm10k_hw *hw = &interface->hw;
1814 int v_budget, vector;
1815
1816
1817
1818
1819
1820
1821
1822 v_budget = max(interface->num_rx_queues, interface->num_tx_queues);
1823 v_budget = min_t(u16, v_budget, num_online_cpus());
1824
1825
1826 v_budget += NON_Q_VECTORS(hw);
1827
1828
1829
1830
1831
1832
1833
1834 v_budget = min_t(int, v_budget, hw->mac.max_msix_vectors);
1835
1836
1837 interface->msix_entries = kcalloc(v_budget, sizeof(struct msix_entry),
1838 GFP_KERNEL);
1839 if (!interface->msix_entries)
1840 return -ENOMEM;
1841
1842
1843 for (vector = 0; vector < v_budget; vector++)
1844 interface->msix_entries[vector].entry = vector;
1845
1846
1847 v_budget = pci_enable_msix_range(interface->pdev,
1848 interface->msix_entries,
1849 MIN_MSIX_COUNT(hw),
1850 v_budget);
1851 if (v_budget < 0) {
1852 kfree(interface->msix_entries);
1853 interface->msix_entries = NULL;
1854 return v_budget;
1855 }
1856
1857
1858 interface->num_q_vectors = v_budget - NON_Q_VECTORS(hw);
1859
1860 return 0;
1861}
1862
1863
1864
1865
1866
1867
1868
1869static bool fm10k_cache_ring_qos(struct fm10k_intfc *interface)
1870{
1871 struct net_device *dev = interface->netdev;
1872 int pc, offset, rss_i, i, q_idx;
1873 u16 pc_stride = interface->ring_feature[RING_F_QOS].mask + 1;
1874 u8 num_pcs = netdev_get_num_tc(dev);
1875
1876 if (num_pcs <= 1)
1877 return false;
1878
1879 rss_i = interface->ring_feature[RING_F_RSS].indices;
1880
1881 for (pc = 0, offset = 0; pc < num_pcs; pc++, offset += rss_i) {
1882 q_idx = pc;
1883 for (i = 0; i < rss_i; i++) {
1884 interface->tx_ring[offset + i]->reg_idx = q_idx;
1885 interface->tx_ring[offset + i]->qos_pc = pc;
1886 interface->rx_ring[offset + i]->reg_idx = q_idx;
1887 interface->rx_ring[offset + i]->qos_pc = pc;
1888 q_idx += pc_stride;
1889 }
1890 }
1891
1892 return true;
1893}
1894
1895
1896
1897
1898
1899
1900
1901static void fm10k_cache_ring_rss(struct fm10k_intfc *interface)
1902{
1903 int i;
1904
1905 for (i = 0; i < interface->num_rx_queues; i++)
1906 interface->rx_ring[i]->reg_idx = i;
1907
1908 for (i = 0; i < interface->num_tx_queues; i++)
1909 interface->tx_ring[i]->reg_idx = i;
1910}
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920static void fm10k_assign_rings(struct fm10k_intfc *interface)
1921{
1922 if (fm10k_cache_ring_qos(interface))
1923 return;
1924
1925 fm10k_cache_ring_rss(interface);
1926}
1927
1928static void fm10k_init_reta(struct fm10k_intfc *interface)
1929{
1930 u16 i, rss_i = interface->ring_feature[RING_F_RSS].indices;
1931 u32 reta;
1932
1933
1934
1935
1936 if (netif_is_rxfh_configured(interface->netdev)) {
1937 for (i = FM10K_RETA_SIZE; i--;) {
1938 reta = interface->reta[i];
1939 if ((((reta << 24) >> 24) < rss_i) &&
1940 (((reta << 16) >> 24) < rss_i) &&
1941 (((reta << 8) >> 24) < rss_i) &&
1942 (((reta) >> 24) < rss_i))
1943 continue;
1944
1945
1946 dev_err(&interface->pdev->dev,
1947 "RSS indirection table assigned flows out of queue bounds. Reconfiguring.\n");
1948 goto repopulate_reta;
1949 }
1950
1951
1952 return;
1953 }
1954
1955repopulate_reta:
1956 fm10k_write_reta(interface, NULL);
1957}
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967int fm10k_init_queueing_scheme(struct fm10k_intfc *interface)
1968{
1969 int err;
1970
1971
1972 fm10k_set_num_queues(interface);
1973
1974
1975 err = fm10k_init_msix_capability(interface);
1976 if (err) {
1977 dev_err(&interface->pdev->dev,
1978 "Unable to initialize MSI-X capability\n");
1979 goto err_init_msix;
1980 }
1981
1982
1983 err = fm10k_alloc_q_vectors(interface);
1984 if (err) {
1985 dev_err(&interface->pdev->dev,
1986 "Unable to allocate queue vectors\n");
1987 goto err_alloc_q_vectors;
1988 }
1989
1990
1991 fm10k_assign_rings(interface);
1992
1993
1994 fm10k_init_reta(interface);
1995
1996 return 0;
1997
1998err_alloc_q_vectors:
1999 fm10k_reset_msix_capability(interface);
2000err_init_msix:
2001 fm10k_reset_num_queues(interface);
2002 return err;
2003}
2004
2005
2006
2007
2008
2009
2010
2011
2012void fm10k_clear_queueing_scheme(struct fm10k_intfc *interface)
2013{
2014 fm10k_free_q_vectors(interface);
2015 fm10k_reset_msix_capability(interface);
2016}
2017