New upstream version 18.02
[deb_dpdk.git] / drivers / net / sfc / sfc_ef10_rx.c
1 /* SPDX-License-Identifier: BSD-3-Clause
2  *
3  * Copyright (c) 2016-2018 Solarflare Communications Inc.
4  * All rights reserved.
5  *
6  * This software was jointly developed between OKTET Labs (under contract
7  * for Solarflare) and Solarflare Communications, Inc.
8  */
9
10 /* EF10 native datapath implementation */
11
12 #include <stdbool.h>
13
14 #include <rte_byteorder.h>
15 #include <rte_mbuf_ptype.h>
16 #include <rte_mbuf.h>
17 #include <rte_io.h>
18
19 #include "efx.h"
20 #include "efx_types.h"
21 #include "efx_regs.h"
22 #include "efx_regs_ef10.h"
23
24 #include "sfc_tweak.h"
25 #include "sfc_dp_rx.h"
26 #include "sfc_kvargs.h"
27 #include "sfc_ef10.h"
28
29 #define sfc_ef10_rx_err(dpq, ...) \
30         SFC_DP_LOG(SFC_KVARG_DATAPATH_EF10, ERR, dpq, __VA_ARGS__)
31
32 /**
33  * Alignment requirement for value written to RX WPTR:
34  * the WPTR must be aligned to an 8 descriptor boundary.
35  */
36 #define SFC_EF10_RX_WPTR_ALIGN  8
37
38 /**
39  * Maximum number of descriptors/buffers in the Rx ring.
40  * It should guarantee that corresponding event queue never overfill.
41  * EF10 native datapath uses event queue of the same size as Rx queue.
42  * Maximum number of events on datapath can be estimated as number of
43  * Rx queue entries (one event per Rx buffer in the worst case) plus
44  * Rx error and flush events.
45  */
46 #define SFC_EF10_RXQ_LIMIT(_ndesc) \
47         ((_ndesc) - 1 /* head must not step on tail */ - \
48          (SFC_EF10_EV_PER_CACHE_LINE - 1) /* max unused EvQ entries */ - \
49          1 /* Rx error */ - 1 /* flush */)
50
51 struct sfc_ef10_rx_sw_desc {
52         struct rte_mbuf                 *mbuf;
53 };
54
55 struct sfc_ef10_rxq {
56         /* Used on data path */
57         unsigned int                    flags;
58 #define SFC_EF10_RXQ_STARTED            0x1
59 #define SFC_EF10_RXQ_NOT_RUNNING        0x2
60 #define SFC_EF10_RXQ_EXCEPTION          0x4
61 #define SFC_EF10_RXQ_RSS_HASH           0x8
62         unsigned int                    ptr_mask;
63         unsigned int                    prepared;
64         unsigned int                    completed;
65         unsigned int                    evq_read_ptr;
66         efx_qword_t                     *evq_hw_ring;
67         struct sfc_ef10_rx_sw_desc      *sw_ring;
68         uint64_t                        rearm_data;
69         uint16_t                        prefix_size;
70
71         /* Used on refill */
72         uint16_t                        buf_size;
73         unsigned int                    added;
74         unsigned int                    max_fill_level;
75         unsigned int                    refill_threshold;
76         struct rte_mempool              *refill_mb_pool;
77         efx_qword_t                     *rxq_hw_ring;
78         volatile void                   *doorbell;
79
80         /* Datapath receive queue anchor */
81         struct sfc_dp_rxq               dp;
82 };
83
84 static inline struct sfc_ef10_rxq *
85 sfc_ef10_rxq_by_dp_rxq(struct sfc_dp_rxq *dp_rxq)
86 {
87         return container_of(dp_rxq, struct sfc_ef10_rxq, dp);
88 }
89
90 static void
91 sfc_ef10_rx_qpush(struct sfc_ef10_rxq *rxq)
92 {
93         efx_dword_t dword;
94
95         /* Hardware has alignment restriction for WPTR */
96         RTE_BUILD_BUG_ON(SFC_RX_REFILL_BULK % SFC_EF10_RX_WPTR_ALIGN != 0);
97         SFC_ASSERT(RTE_ALIGN(rxq->added, SFC_EF10_RX_WPTR_ALIGN) == rxq->added);
98
99         EFX_POPULATE_DWORD_1(dword, ERF_DZ_RX_DESC_WPTR,
100                              rxq->added & rxq->ptr_mask);
101
102         /* DMA sync to device is not required */
103
104         /*
105          * rte_write32() has rte_io_wmb() which guarantees that the STORE
106          * operations (i.e. Rx and event descriptor updates) that precede
107          * the rte_io_wmb() call are visible to NIC before the STORE
108          * operations that follow it (i.e. doorbell write).
109          */
110         rte_write32(dword.ed_u32[0], rxq->doorbell);
111 }
112
113 static void
114 sfc_ef10_rx_qrefill(struct sfc_ef10_rxq *rxq)
115 {
116         const unsigned int ptr_mask = rxq->ptr_mask;
117         const uint32_t buf_size = rxq->buf_size;
118         unsigned int free_space;
119         unsigned int bulks;
120         void *objs[SFC_RX_REFILL_BULK];
121         unsigned int added = rxq->added;
122
123         free_space = rxq->max_fill_level - (added - rxq->completed);
124
125         if (free_space < rxq->refill_threshold)
126                 return;
127
128         bulks = free_space / RTE_DIM(objs);
129         /* refill_threshold guarantees that bulks is positive */
130         SFC_ASSERT(bulks > 0);
131
132         do {
133                 unsigned int id;
134                 unsigned int i;
135
136                 if (unlikely(rte_mempool_get_bulk(rxq->refill_mb_pool, objs,
137                                                   RTE_DIM(objs)) < 0)) {
138                         struct rte_eth_dev_data *dev_data =
139                                 rte_eth_devices[rxq->dp.dpq.port_id].data;
140
141                         /*
142                          * It is hardly a safe way to increment counter
143                          * from different contexts, but all PMDs do it.
144                          */
145                         dev_data->rx_mbuf_alloc_failed += RTE_DIM(objs);
146                         /* Return if we have posted nothing yet */
147                         if (added == rxq->added)
148                                 return;
149                         /* Push posted */
150                         break;
151                 }
152
153                 for (i = 0, id = added & ptr_mask;
154                      i < RTE_DIM(objs);
155                      ++i, ++id) {
156                         struct rte_mbuf *m = objs[i];
157                         struct sfc_ef10_rx_sw_desc *rxd;
158                         rte_iova_t phys_addr;
159
160                         SFC_ASSERT((id & ~ptr_mask) == 0);
161                         rxd = &rxq->sw_ring[id];
162                         rxd->mbuf = m;
163
164                         /*
165                          * Avoid writing to mbuf. It is cheaper to do it
166                          * when we receive packet and fill in nearby
167                          * structure members.
168                          */
169
170                         phys_addr = rte_mbuf_data_iova_default(m);
171                         EFX_POPULATE_QWORD_2(rxq->rxq_hw_ring[id],
172                             ESF_DZ_RX_KER_BYTE_CNT, buf_size,
173                             ESF_DZ_RX_KER_BUF_ADDR, phys_addr);
174                 }
175
176                 added += RTE_DIM(objs);
177         } while (--bulks > 0);
178
179         SFC_ASSERT(rxq->added != added);
180         rxq->added = added;
181         sfc_ef10_rx_qpush(rxq);
182 }
183
184 static void
185 sfc_ef10_rx_prefetch_next(struct sfc_ef10_rxq *rxq, unsigned int next_id)
186 {
187         struct rte_mbuf *next_mbuf;
188
189         /* Prefetch next bunch of software descriptors */
190         if ((next_id % (RTE_CACHE_LINE_SIZE / sizeof(rxq->sw_ring[0]))) == 0)
191                 rte_prefetch0(&rxq->sw_ring[next_id]);
192
193         /*
194          * It looks strange to prefetch depending on previous prefetch
195          * data, but measurements show that it is really efficient and
196          * increases packet rate.
197          */
198         next_mbuf = rxq->sw_ring[next_id].mbuf;
199         if (likely(next_mbuf != NULL)) {
200                 /* Prefetch the next mbuf structure */
201                 rte_mbuf_prefetch_part1(next_mbuf);
202
203                 /* Prefetch pseudo header of the next packet */
204                 /* data_off is not filled in yet */
205                 /* Yes, data could be not ready yet, but we hope */
206                 rte_prefetch0((uint8_t *)next_mbuf->buf_addr +
207                               RTE_PKTMBUF_HEADROOM);
208         }
209 }
210
211 static uint16_t
212 sfc_ef10_rx_prepared(struct sfc_ef10_rxq *rxq, struct rte_mbuf **rx_pkts,
213                      uint16_t nb_pkts)
214 {
215         uint16_t n_rx_pkts = RTE_MIN(nb_pkts, rxq->prepared);
216         unsigned int completed = rxq->completed;
217         unsigned int i;
218
219         rxq->prepared -= n_rx_pkts;
220         rxq->completed = completed + n_rx_pkts;
221
222         for (i = 0; i < n_rx_pkts; ++i, ++completed)
223                 rx_pkts[i] = rxq->sw_ring[completed & rxq->ptr_mask].mbuf;
224
225         return n_rx_pkts;
226 }
227
228 static void
229 sfc_ef10_rx_ev_to_offloads(struct sfc_ef10_rxq *rxq, const efx_qword_t rx_ev,
230                            struct rte_mbuf *m)
231 {
232         uint32_t tun_ptype = 0;
233         /* Which event bit is mapped to PKT_RX_IP_CKSUM_* */
234         int8_t ip_csum_err_bit;
235         /* Which event bit is mapped to PKT_RX_L4_CKSUM_* */
236         int8_t l4_csum_err_bit;
237         uint32_t l2_ptype = 0;
238         uint32_t l3_ptype = 0;
239         uint32_t l4_ptype = 0;
240         uint64_t ol_flags = 0;
241
242         if (unlikely(EFX_TEST_QWORD_BIT(rx_ev, ESF_DZ_RX_PARSE_INCOMPLETE_LBN)))
243                 goto done;
244
245         switch (EFX_QWORD_FIELD(rx_ev, ESF_EZ_RX_ENCAP_HDR)) {
246         default:
247                 /* Unexpected encapsulation tag class */
248                 SFC_ASSERT(false);
249                 /* FALLTHROUGH */
250         case ESE_EZ_ENCAP_HDR_NONE:
251                 break;
252         case ESE_EZ_ENCAP_HDR_VXLAN:
253                 /*
254                  * It is definitely UDP, but we have no information
255                  * about IPv4 vs IPv6 and VLAN tagging.
256                  */
257                 tun_ptype = RTE_PTYPE_TUNNEL_VXLAN | RTE_PTYPE_L4_UDP;
258                 break;
259         case ESE_EZ_ENCAP_HDR_GRE:
260                 /*
261                  * We have no information about IPv4 vs IPv6 and VLAN tagging.
262                  */
263                 tun_ptype = RTE_PTYPE_TUNNEL_NVGRE;
264                 break;
265         }
266
267         if (tun_ptype == 0) {
268                 ip_csum_err_bit = ESF_DZ_RX_IPCKSUM_ERR_LBN;
269                 l4_csum_err_bit = ESF_DZ_RX_TCPUDP_CKSUM_ERR_LBN;
270         } else {
271                 ip_csum_err_bit = ESF_EZ_RX_IP_INNER_CHKSUM_ERR_LBN;
272                 l4_csum_err_bit = ESF_EZ_RX_TCP_UDP_INNER_CHKSUM_ERR_LBN;
273                 if (unlikely(EFX_TEST_QWORD_BIT(rx_ev,
274                                                 ESF_DZ_RX_IPCKSUM_ERR_LBN)))
275                         ol_flags |= PKT_RX_EIP_CKSUM_BAD;
276         }
277
278         switch (EFX_QWORD_FIELD(rx_ev, ESF_DZ_RX_ETH_TAG_CLASS)) {
279         case ESE_DZ_ETH_TAG_CLASS_NONE:
280                 l2_ptype = (tun_ptype == 0) ? RTE_PTYPE_L2_ETHER :
281                         RTE_PTYPE_INNER_L2_ETHER;
282                 break;
283         case ESE_DZ_ETH_TAG_CLASS_VLAN1:
284                 l2_ptype = (tun_ptype == 0) ? RTE_PTYPE_L2_ETHER_VLAN :
285                         RTE_PTYPE_INNER_L2_ETHER_VLAN;
286                 break;
287         case ESE_DZ_ETH_TAG_CLASS_VLAN2:
288                 l2_ptype = (tun_ptype == 0) ? RTE_PTYPE_L2_ETHER_QINQ :
289                         RTE_PTYPE_INNER_L2_ETHER_QINQ;
290                 break;
291         default:
292                 /* Unexpected Eth tag class */
293                 SFC_ASSERT(false);
294         }
295
296         switch (EFX_QWORD_FIELD(rx_ev, ESF_DZ_RX_L3_CLASS)) {
297         case ESE_DZ_L3_CLASS_IP4_FRAG:
298                 l4_ptype = (tun_ptype == 0) ? RTE_PTYPE_L4_FRAG :
299                         RTE_PTYPE_INNER_L4_FRAG;
300                 /* FALLTHROUGH */
301         case ESE_DZ_L3_CLASS_IP4:
302                 l3_ptype = (tun_ptype == 0) ? RTE_PTYPE_L3_IPV4_EXT_UNKNOWN :
303                         RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN;
304                 ol_flags |= PKT_RX_RSS_HASH |
305                         ((EFX_TEST_QWORD_BIT(rx_ev, ip_csum_err_bit)) ?
306                          PKT_RX_IP_CKSUM_BAD : PKT_RX_IP_CKSUM_GOOD);
307                 break;
308         case ESE_DZ_L3_CLASS_IP6_FRAG:
309                 l4_ptype = (tun_ptype == 0) ? RTE_PTYPE_L4_FRAG :
310                         RTE_PTYPE_INNER_L4_FRAG;
311                 /* FALLTHROUGH */
312         case ESE_DZ_L3_CLASS_IP6:
313                 l3_ptype = (tun_ptype == 0) ? RTE_PTYPE_L3_IPV6_EXT_UNKNOWN :
314                         RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN;
315                 ol_flags |= PKT_RX_RSS_HASH;
316                 break;
317         case ESE_DZ_L3_CLASS_ARP:
318                 /* Override Layer 2 packet type */
319                 /* There is no ARP classification for inner packets */
320                 if (tun_ptype == 0)
321                         l2_ptype = RTE_PTYPE_L2_ETHER_ARP;
322                 break;
323         default:
324                 /* Unexpected Layer 3 class */
325                 SFC_ASSERT(false);
326         }
327
328         switch (EFX_QWORD_FIELD(rx_ev, ESF_DZ_RX_L4_CLASS)) {
329         case ESE_DZ_L4_CLASS_TCP:
330                 l4_ptype = (tun_ptype == 0) ? RTE_PTYPE_L4_TCP :
331                         RTE_PTYPE_INNER_L4_TCP;
332                 ol_flags |=
333                         (EFX_TEST_QWORD_BIT(rx_ev, l4_csum_err_bit)) ?
334                         PKT_RX_L4_CKSUM_BAD : PKT_RX_L4_CKSUM_GOOD;
335                 break;
336         case ESE_DZ_L4_CLASS_UDP:
337                 l4_ptype = (tun_ptype == 0) ? RTE_PTYPE_L4_UDP :
338                         RTE_PTYPE_INNER_L4_UDP;
339                 ol_flags |=
340                         (EFX_TEST_QWORD_BIT(rx_ev, l4_csum_err_bit)) ?
341                         PKT_RX_L4_CKSUM_BAD : PKT_RX_L4_CKSUM_GOOD;
342                 break;
343         case ESE_DZ_L4_CLASS_UNKNOWN:
344                 break;
345         default:
346                 /* Unexpected Layer 4 class */
347                 SFC_ASSERT(false);
348         }
349
350         /* Remove RSS hash offload flag if RSS is not enabled */
351         if (~rxq->flags & SFC_EF10_RXQ_RSS_HASH)
352                 ol_flags &= ~PKT_RX_RSS_HASH;
353
354 done:
355         m->ol_flags = ol_flags;
356         m->packet_type = tun_ptype | l2_ptype | l3_ptype | l4_ptype;
357 }
358
359 static uint16_t
360 sfc_ef10_rx_pseudo_hdr_get_len(const uint8_t *pseudo_hdr)
361 {
362         return rte_le_to_cpu_16(*(const uint16_t *)&pseudo_hdr[8]);
363 }
364
365 static uint32_t
366 sfc_ef10_rx_pseudo_hdr_get_hash(const uint8_t *pseudo_hdr)
367 {
368         return rte_le_to_cpu_32(*(const uint32_t *)pseudo_hdr);
369 }
370
371 static uint16_t
372 sfc_ef10_rx_process_event(struct sfc_ef10_rxq *rxq, efx_qword_t rx_ev,
373                           struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
374 {
375         const unsigned int ptr_mask = rxq->ptr_mask;
376         unsigned int completed = rxq->completed;
377         unsigned int ready;
378         struct sfc_ef10_rx_sw_desc *rxd;
379         struct rte_mbuf *m;
380         struct rte_mbuf *m0;
381         uint16_t n_rx_pkts;
382         const uint8_t *pseudo_hdr;
383         uint16_t pkt_len;
384
385         ready = (EFX_QWORD_FIELD(rx_ev, ESF_DZ_RX_DSC_PTR_LBITS) - completed) &
386                 EFX_MASK32(ESF_DZ_RX_DSC_PTR_LBITS);
387         SFC_ASSERT(ready > 0);
388
389         if (rx_ev.eq_u64[0] &
390             rte_cpu_to_le_64((1ull << ESF_DZ_RX_ECC_ERR_LBN) |
391                              (1ull << ESF_DZ_RX_ECRC_ERR_LBN))) {
392                 SFC_ASSERT(rxq->prepared == 0);
393                 rxq->completed += ready;
394                 while (ready-- > 0) {
395                         rxd = &rxq->sw_ring[completed++ & ptr_mask];
396                         rte_mempool_put(rxq->refill_mb_pool, rxd->mbuf);
397                 }
398                 return 0;
399         }
400
401         n_rx_pkts = RTE_MIN(ready, nb_pkts);
402         rxq->prepared = ready - n_rx_pkts;
403         rxq->completed += n_rx_pkts;
404
405         rxd = &rxq->sw_ring[completed++ & ptr_mask];
406
407         sfc_ef10_rx_prefetch_next(rxq, completed & ptr_mask);
408
409         m = rxd->mbuf;
410
411         *rx_pkts++ = m;
412
413         RTE_BUILD_BUG_ON(sizeof(m->rearm_data[0]) != sizeof(rxq->rearm_data));
414         m->rearm_data[0] = rxq->rearm_data;
415
416         /* Classify packet based on Rx event */
417         sfc_ef10_rx_ev_to_offloads(rxq, rx_ev, m);
418
419         /* data_off already moved past pseudo header */
420         pseudo_hdr = (uint8_t *)m->buf_addr + RTE_PKTMBUF_HEADROOM;
421
422         /*
423          * Always get RSS hash from pseudo header to avoid
424          * condition/branching. If it is valid or not depends on
425          * PKT_RX_RSS_HASH in m->ol_flags.
426          */
427         m->hash.rss = sfc_ef10_rx_pseudo_hdr_get_hash(pseudo_hdr);
428
429         if (ready == 1)
430                 pkt_len = EFX_QWORD_FIELD(rx_ev, ESF_DZ_RX_BYTES) -
431                         rxq->prefix_size;
432         else
433                 pkt_len = sfc_ef10_rx_pseudo_hdr_get_len(pseudo_hdr);
434         SFC_ASSERT(pkt_len > 0);
435         rte_pktmbuf_data_len(m) = pkt_len;
436         rte_pktmbuf_pkt_len(m) = pkt_len;
437
438         SFC_ASSERT(m->next == NULL);
439
440         /* Remember mbuf to copy offload flags and packet type from */
441         m0 = m;
442         for (--ready; ready > 0; --ready) {
443                 rxd = &rxq->sw_ring[completed++ & ptr_mask];
444
445                 sfc_ef10_rx_prefetch_next(rxq, completed & ptr_mask);
446
447                 m = rxd->mbuf;
448
449                 if (ready > rxq->prepared)
450                         *rx_pkts++ = m;
451
452                 RTE_BUILD_BUG_ON(sizeof(m->rearm_data[0]) !=
453                                  sizeof(rxq->rearm_data));
454                 m->rearm_data[0] = rxq->rearm_data;
455
456                 /* Event-dependent information is the same */
457                 m->ol_flags = m0->ol_flags;
458                 m->packet_type = m0->packet_type;
459
460                 /* data_off already moved past pseudo header */
461                 pseudo_hdr = (uint8_t *)m->buf_addr + RTE_PKTMBUF_HEADROOM;
462
463                 /*
464                  * Always get RSS hash from pseudo header to avoid
465                  * condition/branching. If it is valid or not depends on
466                  * PKT_RX_RSS_HASH in m->ol_flags.
467                  */
468                 m->hash.rss = sfc_ef10_rx_pseudo_hdr_get_hash(pseudo_hdr);
469
470                 pkt_len = sfc_ef10_rx_pseudo_hdr_get_len(pseudo_hdr);
471                 SFC_ASSERT(pkt_len > 0);
472                 rte_pktmbuf_data_len(m) = pkt_len;
473                 rte_pktmbuf_pkt_len(m) = pkt_len;
474
475                 SFC_ASSERT(m->next == NULL);
476         }
477
478         return n_rx_pkts;
479 }
480
481 static bool
482 sfc_ef10_rx_get_event(struct sfc_ef10_rxq *rxq, efx_qword_t *rx_ev)
483 {
484         *rx_ev = rxq->evq_hw_ring[rxq->evq_read_ptr & rxq->ptr_mask];
485
486         if (!sfc_ef10_ev_present(*rx_ev))
487                 return false;
488
489         if (unlikely(EFX_QWORD_FIELD(*rx_ev, FSF_AZ_EV_CODE) !=
490                      FSE_AZ_EV_CODE_RX_EV)) {
491                 /*
492                  * Do not move read_ptr to keep the event for exception
493                  * handling by the control path.
494                  */
495                 rxq->flags |= SFC_EF10_RXQ_EXCEPTION;
496                 sfc_ef10_rx_err(&rxq->dp.dpq,
497                                 "RxQ exception at EvQ read ptr %#x",
498                                 rxq->evq_read_ptr);
499                 return false;
500         }
501
502         rxq->evq_read_ptr++;
503         return true;
504 }
505
506 static uint16_t
507 sfc_ef10_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
508 {
509         struct sfc_ef10_rxq *rxq = sfc_ef10_rxq_by_dp_rxq(rx_queue);
510         unsigned int evq_old_read_ptr;
511         uint16_t n_rx_pkts;
512         efx_qword_t rx_ev;
513
514         if (unlikely(rxq->flags &
515                      (SFC_EF10_RXQ_NOT_RUNNING | SFC_EF10_RXQ_EXCEPTION)))
516                 return 0;
517
518         n_rx_pkts = sfc_ef10_rx_prepared(rxq, rx_pkts, nb_pkts);
519
520         evq_old_read_ptr = rxq->evq_read_ptr;
521         while (n_rx_pkts != nb_pkts && sfc_ef10_rx_get_event(rxq, &rx_ev)) {
522                 /*
523                  * DROP_EVENT is an internal to the NIC, software should
524                  * never see it and, therefore, may ignore it.
525                  */
526
527                 n_rx_pkts += sfc_ef10_rx_process_event(rxq, rx_ev,
528                                                        rx_pkts + n_rx_pkts,
529                                                        nb_pkts - n_rx_pkts);
530         }
531
532         sfc_ef10_ev_qclear(rxq->evq_hw_ring, rxq->ptr_mask, evq_old_read_ptr,
533                            rxq->evq_read_ptr);
534
535         /* It is not a problem if we refill in the case of exception */
536         sfc_ef10_rx_qrefill(rxq);
537
538         return n_rx_pkts;
539 }
540
541 static const uint32_t *
542 sfc_ef10_supported_ptypes_get(uint32_t tunnel_encaps)
543 {
544         static const uint32_t ef10_native_ptypes[] = {
545                 RTE_PTYPE_L2_ETHER,
546                 RTE_PTYPE_L2_ETHER_ARP,
547                 RTE_PTYPE_L2_ETHER_VLAN,
548                 RTE_PTYPE_L2_ETHER_QINQ,
549                 RTE_PTYPE_L3_IPV4_EXT_UNKNOWN,
550                 RTE_PTYPE_L3_IPV6_EXT_UNKNOWN,
551                 RTE_PTYPE_L4_FRAG,
552                 RTE_PTYPE_L4_TCP,
553                 RTE_PTYPE_L4_UDP,
554                 RTE_PTYPE_UNKNOWN
555         };
556         static const uint32_t ef10_overlay_ptypes[] = {
557                 RTE_PTYPE_L2_ETHER,
558                 RTE_PTYPE_L2_ETHER_ARP,
559                 RTE_PTYPE_L2_ETHER_VLAN,
560                 RTE_PTYPE_L2_ETHER_QINQ,
561                 RTE_PTYPE_L3_IPV4_EXT_UNKNOWN,
562                 RTE_PTYPE_L3_IPV6_EXT_UNKNOWN,
563                 RTE_PTYPE_L4_FRAG,
564                 RTE_PTYPE_L4_TCP,
565                 RTE_PTYPE_L4_UDP,
566                 RTE_PTYPE_TUNNEL_VXLAN,
567                 RTE_PTYPE_TUNNEL_NVGRE,
568                 RTE_PTYPE_INNER_L2_ETHER,
569                 RTE_PTYPE_INNER_L2_ETHER_VLAN,
570                 RTE_PTYPE_INNER_L2_ETHER_QINQ,
571                 RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN,
572                 RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN,
573                 RTE_PTYPE_INNER_L4_FRAG,
574                 RTE_PTYPE_INNER_L4_TCP,
575                 RTE_PTYPE_INNER_L4_UDP,
576                 RTE_PTYPE_UNKNOWN
577         };
578
579         /*
580          * The function returns static set of supported packet types,
581          * so we can't build it dynamically based on supported tunnel
582          * encapsulations and should limit to known sets.
583          */
584         switch (tunnel_encaps) {
585         case (1u << EFX_TUNNEL_PROTOCOL_VXLAN |
586               1u << EFX_TUNNEL_PROTOCOL_GENEVE |
587               1u << EFX_TUNNEL_PROTOCOL_NVGRE):
588                 return ef10_overlay_ptypes;
589         default:
590                 RTE_LOG(ERR, PMD,
591                         "Unexpected set of supported tunnel encapsulations: %#x\n",
592                         tunnel_encaps);
593                 /* FALLTHROUGH */
594         case 0:
595                 return ef10_native_ptypes;
596         }
597 }
598
599 static sfc_dp_rx_qdesc_npending_t sfc_ef10_rx_qdesc_npending;
600 static unsigned int
601 sfc_ef10_rx_qdesc_npending(__rte_unused struct sfc_dp_rxq *dp_rxq)
602 {
603         /*
604          * Correct implementation requires EvQ polling and events
605          * processing (keeping all ready mbufs in prepared).
606          */
607         return -ENOTSUP;
608 }
609
610 static sfc_dp_rx_qdesc_status_t sfc_ef10_rx_qdesc_status;
611 static int
612 sfc_ef10_rx_qdesc_status(__rte_unused struct sfc_dp_rxq *dp_rxq,
613                          __rte_unused uint16_t offset)
614 {
615         return -ENOTSUP;
616 }
617
618
619 static sfc_dp_rx_get_dev_info_t sfc_ef10_rx_get_dev_info;
620 static void
621 sfc_ef10_rx_get_dev_info(struct rte_eth_dev_info *dev_info)
622 {
623         /*
624          * Number of descriptors just defines maximum number of pushed
625          * descriptors (fill level).
626          */
627         dev_info->rx_desc_lim.nb_min = SFC_RX_REFILL_BULK;
628         dev_info->rx_desc_lim.nb_align = SFC_RX_REFILL_BULK;
629 }
630
631
632 static sfc_dp_rx_qsize_up_rings_t sfc_ef10_rx_qsize_up_rings;
633 static int
634 sfc_ef10_rx_qsize_up_rings(uint16_t nb_rx_desc,
635                            unsigned int *rxq_entries,
636                            unsigned int *evq_entries,
637                            unsigned int *rxq_max_fill_level)
638 {
639         /*
640          * rte_ethdev API guarantees that the number meets min, max and
641          * alignment requirements.
642          */
643         if (nb_rx_desc <= EFX_RXQ_MINNDESCS)
644                 *rxq_entries = EFX_RXQ_MINNDESCS;
645         else
646                 *rxq_entries = rte_align32pow2(nb_rx_desc);
647
648         *evq_entries = *rxq_entries;
649
650         *rxq_max_fill_level = RTE_MIN(nb_rx_desc,
651                                       SFC_EF10_RXQ_LIMIT(*evq_entries));
652         return 0;
653 }
654
655
656 static uint64_t
657 sfc_ef10_mk_mbuf_rearm_data(uint16_t port_id, uint16_t prefix_size)
658 {
659         struct rte_mbuf m;
660
661         memset(&m, 0, sizeof(m));
662
663         rte_mbuf_refcnt_set(&m, 1);
664         m.data_off = RTE_PKTMBUF_HEADROOM + prefix_size;
665         m.nb_segs = 1;
666         m.port = port_id;
667
668         /* rearm_data covers structure members filled in above */
669         rte_compiler_barrier();
670         RTE_BUILD_BUG_ON(sizeof(m.rearm_data[0]) != sizeof(uint64_t));
671         return m.rearm_data[0];
672 }
673
674 static sfc_dp_rx_qcreate_t sfc_ef10_rx_qcreate;
675 static int
676 sfc_ef10_rx_qcreate(uint16_t port_id, uint16_t queue_id,
677                     const struct rte_pci_addr *pci_addr, int socket_id,
678                     const struct sfc_dp_rx_qcreate_info *info,
679                     struct sfc_dp_rxq **dp_rxqp)
680 {
681         struct sfc_ef10_rxq *rxq;
682         int rc;
683
684         rc = EINVAL;
685         if (info->rxq_entries != info->evq_entries)
686                 goto fail_rxq_args;
687
688         rc = ENOMEM;
689         rxq = rte_zmalloc_socket("sfc-ef10-rxq", sizeof(*rxq),
690                                  RTE_CACHE_LINE_SIZE, socket_id);
691         if (rxq == NULL)
692                 goto fail_rxq_alloc;
693
694         sfc_dp_queue_init(&rxq->dp.dpq, port_id, queue_id, pci_addr);
695
696         rc = ENOMEM;
697         rxq->sw_ring = rte_calloc_socket("sfc-ef10-rxq-sw_ring",
698                                          info->rxq_entries,
699                                          sizeof(*rxq->sw_ring),
700                                          RTE_CACHE_LINE_SIZE, socket_id);
701         if (rxq->sw_ring == NULL)
702                 goto fail_desc_alloc;
703
704         rxq->flags |= SFC_EF10_RXQ_NOT_RUNNING;
705         if (info->flags & SFC_RXQ_FLAG_RSS_HASH)
706                 rxq->flags |= SFC_EF10_RXQ_RSS_HASH;
707         rxq->ptr_mask = info->rxq_entries - 1;
708         rxq->evq_hw_ring = info->evq_hw_ring;
709         rxq->max_fill_level = info->max_fill_level;
710         rxq->refill_threshold = info->refill_threshold;
711         rxq->rearm_data =
712                 sfc_ef10_mk_mbuf_rearm_data(port_id, info->prefix_size);
713         rxq->prefix_size = info->prefix_size;
714         rxq->buf_size = info->buf_size;
715         rxq->refill_mb_pool = info->refill_mb_pool;
716         rxq->rxq_hw_ring = info->rxq_hw_ring;
717         rxq->doorbell = (volatile uint8_t *)info->mem_bar +
718                         ER_DZ_RX_DESC_UPD_REG_OFST +
719                         info->hw_index * ER_DZ_RX_DESC_UPD_REG_STEP;
720
721         *dp_rxqp = &rxq->dp;
722         return 0;
723
724 fail_desc_alloc:
725         rte_free(rxq);
726
727 fail_rxq_alloc:
728 fail_rxq_args:
729         return rc;
730 }
731
732 static sfc_dp_rx_qdestroy_t sfc_ef10_rx_qdestroy;
733 static void
734 sfc_ef10_rx_qdestroy(struct sfc_dp_rxq *dp_rxq)
735 {
736         struct sfc_ef10_rxq *rxq = sfc_ef10_rxq_by_dp_rxq(dp_rxq);
737
738         rte_free(rxq->sw_ring);
739         rte_free(rxq);
740 }
741
742 static sfc_dp_rx_qstart_t sfc_ef10_rx_qstart;
743 static int
744 sfc_ef10_rx_qstart(struct sfc_dp_rxq *dp_rxq, unsigned int evq_read_ptr)
745 {
746         struct sfc_ef10_rxq *rxq = sfc_ef10_rxq_by_dp_rxq(dp_rxq);
747
748         rxq->prepared = 0;
749         rxq->completed = rxq->added = 0;
750
751         sfc_ef10_rx_qrefill(rxq);
752
753         rxq->evq_read_ptr = evq_read_ptr;
754
755         rxq->flags |= SFC_EF10_RXQ_STARTED;
756         rxq->flags &= ~(SFC_EF10_RXQ_NOT_RUNNING | SFC_EF10_RXQ_EXCEPTION);
757
758         return 0;
759 }
760
761 static sfc_dp_rx_qstop_t sfc_ef10_rx_qstop;
762 static void
763 sfc_ef10_rx_qstop(struct sfc_dp_rxq *dp_rxq, unsigned int *evq_read_ptr)
764 {
765         struct sfc_ef10_rxq *rxq = sfc_ef10_rxq_by_dp_rxq(dp_rxq);
766
767         rxq->flags |= SFC_EF10_RXQ_NOT_RUNNING;
768
769         *evq_read_ptr = rxq->evq_read_ptr;
770 }
771
772 static sfc_dp_rx_qrx_ev_t sfc_ef10_rx_qrx_ev;
773 static bool
774 sfc_ef10_rx_qrx_ev(struct sfc_dp_rxq *dp_rxq, __rte_unused unsigned int id)
775 {
776         __rte_unused struct sfc_ef10_rxq *rxq = sfc_ef10_rxq_by_dp_rxq(dp_rxq);
777
778         SFC_ASSERT(rxq->flags & SFC_EF10_RXQ_NOT_RUNNING);
779
780         /*
781          * It is safe to ignore Rx event since we free all mbufs on
782          * queue purge anyway.
783          */
784
785         return false;
786 }
787
788 static sfc_dp_rx_qpurge_t sfc_ef10_rx_qpurge;
789 static void
790 sfc_ef10_rx_qpurge(struct sfc_dp_rxq *dp_rxq)
791 {
792         struct sfc_ef10_rxq *rxq = sfc_ef10_rxq_by_dp_rxq(dp_rxq);
793         unsigned int i;
794         struct sfc_ef10_rx_sw_desc *rxd;
795
796         for (i = rxq->completed; i != rxq->added; ++i) {
797                 rxd = &rxq->sw_ring[i & rxq->ptr_mask];
798                 rte_mempool_put(rxq->refill_mb_pool, rxd->mbuf);
799                 rxd->mbuf = NULL;
800         }
801
802         rxq->flags &= ~SFC_EF10_RXQ_STARTED;
803 }
804
805 struct sfc_dp_rx sfc_ef10_rx = {
806         .dp = {
807                 .name           = SFC_KVARG_DATAPATH_EF10,
808                 .type           = SFC_DP_RX,
809                 .hw_fw_caps     = SFC_DP_HW_FW_CAP_EF10,
810         },
811         .features               = SFC_DP_RX_FEAT_MULTI_PROCESS |
812                                   SFC_DP_RX_FEAT_TUNNELS,
813         .get_dev_info           = sfc_ef10_rx_get_dev_info,
814         .qsize_up_rings         = sfc_ef10_rx_qsize_up_rings,
815         .qcreate                = sfc_ef10_rx_qcreate,
816         .qdestroy               = sfc_ef10_rx_qdestroy,
817         .qstart                 = sfc_ef10_rx_qstart,
818         .qstop                  = sfc_ef10_rx_qstop,
819         .qrx_ev                 = sfc_ef10_rx_qrx_ev,
820         .qpurge                 = sfc_ef10_rx_qpurge,
821         .supported_ptypes_get   = sfc_ef10_supported_ptypes_get,
822         .qdesc_npending         = sfc_ef10_rx_qdesc_npending,
823         .qdesc_status           = sfc_ef10_rx_qdesc_status,
824         .pkt_burst              = sfc_ef10_recv_pkts,
825 };