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35#include <linux/skbuff.h>
36#include <linux/netdevice.h>
37#include <linux/if.h>
38#include <linux/if_vlan.h>
39#include <linux/jhash.h>
40#include <linux/module.h>
41#include <linux/debugfs.h>
42#include <linux/seq_file.h>
43#include <net/neighbour.h>
44#include "cxgb4.h"
45#include "l2t.h"
46#include "t4_msg.h"
47#include "t4fw_api.h"
48#include "t4_regs.h"
49
50#define VLAN_NONE 0xfff
51
52
53#define F_SYNC_WR (1 << 12)
54
55enum {
56 L2T_STATE_VALID,
57 L2T_STATE_STALE,
58 L2T_STATE_RESOLVING,
59 L2T_STATE_SYNC_WRITE,
60
61
62 L2T_STATE_SWITCHING,
63 L2T_STATE_UNUSED
64};
65
66struct l2t_data {
67 rwlock_t lock;
68 atomic_t nfree;
69 struct l2t_entry *rover;
70 struct l2t_entry l2tab[L2T_SIZE];
71};
72
73static inline unsigned int vlan_prio(const struct l2t_entry *e)
74{
75 return e->vlan >> 13;
76}
77
78static inline void l2t_hold(struct l2t_data *d, struct l2t_entry *e)
79{
80 if (atomic_add_return(1, &e->refcnt) == 1)
81 atomic_dec(&d->nfree);
82}
83
84
85
86
87
88
89enum {
90 L2T_SZ_HALF = L2T_SIZE / 2,
91 L2T_HASH_MASK = L2T_SZ_HALF - 1
92};
93
94static inline unsigned int arp_hash(const u32 *key, int ifindex)
95{
96 return jhash_2words(*key, ifindex, 0) & L2T_HASH_MASK;
97}
98
99static inline unsigned int ipv6_hash(const u32 *key, int ifindex)
100{
101 u32 xor = key[0] ^ key[1] ^ key[2] ^ key[3];
102
103 return L2T_SZ_HALF + (jhash_2words(xor, ifindex, 0) & L2T_HASH_MASK);
104}
105
106static unsigned int addr_hash(const u32 *addr, int addr_len, int ifindex)
107{
108 return addr_len == 4 ? arp_hash(addr, ifindex) :
109 ipv6_hash(addr, ifindex);
110}
111
112
113
114
115
116
117
118
119static int addreq(const struct l2t_entry *e, const u32 *addr)
120{
121 if (e->v6)
122 return (e->addr[0] ^ addr[0]) | (e->addr[1] ^ addr[1]) |
123 (e->addr[2] ^ addr[2]) | (e->addr[3] ^ addr[3]);
124 return e->addr[0] ^ addr[0];
125}
126
127static void neigh_replace(struct l2t_entry *e, struct neighbour *n)
128{
129 neigh_hold(n);
130 if (e->neigh)
131 neigh_release(e->neigh);
132 e->neigh = n;
133}
134
135
136
137
138
139static int write_l2e(struct adapter *adap, struct l2t_entry *e, int sync)
140{
141 struct sk_buff *skb;
142 struct cpl_l2t_write_req *req;
143
144 skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
145 if (!skb)
146 return -ENOMEM;
147
148 req = (struct cpl_l2t_write_req *)__skb_put(skb, sizeof(*req));
149 INIT_TP_WR(req, 0);
150
151 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_L2T_WRITE_REQ,
152 e->idx | (sync ? F_SYNC_WR : 0) |
153 TID_QID(adap->sge.fw_evtq.abs_id)));
154 req->params = htons(L2T_W_PORT(e->lport) | L2T_W_NOREPLY(!sync));
155 req->l2t_idx = htons(e->idx);
156 req->vlan = htons(e->vlan);
157 if (e->neigh && !(e->neigh->dev->flags & IFF_LOOPBACK))
158 memcpy(e->dmac, e->neigh->ha, sizeof(e->dmac));
159 memcpy(req->dst_mac, e->dmac, sizeof(req->dst_mac));
160
161 set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
162 t4_ofld_send(adap, skb);
163
164 if (sync && e->state != L2T_STATE_SWITCHING)
165 e->state = L2T_STATE_SYNC_WRITE;
166 return 0;
167}
168
169
170
171
172
173static void send_pending(struct adapter *adap, struct l2t_entry *e)
174{
175 while (e->arpq_head) {
176 struct sk_buff *skb = e->arpq_head;
177
178 e->arpq_head = skb->next;
179 skb->next = NULL;
180 t4_ofld_send(adap, skb);
181 }
182 e->arpq_tail = NULL;
183}
184
185
186
187
188
189
190void do_l2t_write_rpl(struct adapter *adap, const struct cpl_l2t_write_rpl *rpl)
191{
192 unsigned int tid = GET_TID(rpl);
193 unsigned int idx = tid & (L2T_SIZE - 1);
194
195 if (unlikely(rpl->status != CPL_ERR_NONE)) {
196 dev_err(adap->pdev_dev,
197 "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
198 rpl->status, idx);
199 return;
200 }
201
202 if (tid & F_SYNC_WR) {
203 struct l2t_entry *e = &adap->l2t->l2tab[idx];
204
205 spin_lock(&e->lock);
206 if (e->state != L2T_STATE_SWITCHING) {
207 send_pending(adap, e);
208 e->state = (e->neigh->nud_state & NUD_STALE) ?
209 L2T_STATE_STALE : L2T_STATE_VALID;
210 }
211 spin_unlock(&e->lock);
212 }
213}
214
215
216
217
218
219static inline void arpq_enqueue(struct l2t_entry *e, struct sk_buff *skb)
220{
221 skb->next = NULL;
222 if (e->arpq_head)
223 e->arpq_tail->next = skb;
224 else
225 e->arpq_head = skb;
226 e->arpq_tail = skb;
227}
228
229int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb,
230 struct l2t_entry *e)
231{
232 struct adapter *adap = netdev2adap(dev);
233
234again:
235 switch (e->state) {
236 case L2T_STATE_STALE:
237 neigh_event_send(e->neigh, NULL);
238 spin_lock_bh(&e->lock);
239 if (e->state == L2T_STATE_STALE)
240 e->state = L2T_STATE_VALID;
241 spin_unlock_bh(&e->lock);
242 case L2T_STATE_VALID:
243 return t4_ofld_send(adap, skb);
244 case L2T_STATE_RESOLVING:
245 case L2T_STATE_SYNC_WRITE:
246 spin_lock_bh(&e->lock);
247 if (e->state != L2T_STATE_SYNC_WRITE &&
248 e->state != L2T_STATE_RESOLVING) {
249 spin_unlock_bh(&e->lock);
250 goto again;
251 }
252 arpq_enqueue(e, skb);
253 spin_unlock_bh(&e->lock);
254
255 if (e->state == L2T_STATE_RESOLVING &&
256 !neigh_event_send(e->neigh, NULL)) {
257 spin_lock_bh(&e->lock);
258 if (e->state == L2T_STATE_RESOLVING && e->arpq_head)
259 write_l2e(adap, e, 1);
260 spin_unlock_bh(&e->lock);
261 }
262 }
263 return 0;
264}
265EXPORT_SYMBOL(cxgb4_l2t_send);
266
267
268
269
270static struct l2t_entry *alloc_l2e(struct l2t_data *d)
271{
272 struct l2t_entry *end, *e, **p;
273
274 if (!atomic_read(&d->nfree))
275 return NULL;
276
277
278 for (e = d->rover, end = &d->l2tab[L2T_SIZE]; e != end; ++e)
279 if (atomic_read(&e->refcnt) == 0)
280 goto found;
281
282 for (e = d->l2tab; atomic_read(&e->refcnt); ++e)
283 ;
284found:
285 d->rover = e + 1;
286 atomic_dec(&d->nfree);
287
288
289
290
291
292 if (e->state < L2T_STATE_SWITCHING)
293 for (p = &d->l2tab[e->hash].first; *p; p = &(*p)->next)
294 if (*p == e) {
295 *p = e->next;
296 e->next = NULL;
297 break;
298 }
299
300 e->state = L2T_STATE_UNUSED;
301 return e;
302}
303
304
305
306
307static void t4_l2e_free(struct l2t_entry *e)
308{
309 struct l2t_data *d;
310
311 spin_lock_bh(&e->lock);
312 if (atomic_read(&e->refcnt) == 0) {
313 if (e->neigh) {
314 neigh_release(e->neigh);
315 e->neigh = NULL;
316 }
317 while (e->arpq_head) {
318 struct sk_buff *skb = e->arpq_head;
319
320 e->arpq_head = skb->next;
321 kfree_skb(skb);
322 }
323 e->arpq_tail = NULL;
324 }
325 spin_unlock_bh(&e->lock);
326
327 d = container_of(e, struct l2t_data, l2tab[e->idx]);
328 atomic_inc(&d->nfree);
329}
330
331void cxgb4_l2t_release(struct l2t_entry *e)
332{
333 if (atomic_dec_and_test(&e->refcnt))
334 t4_l2e_free(e);
335}
336EXPORT_SYMBOL(cxgb4_l2t_release);
337
338
339
340
341
342static void reuse_entry(struct l2t_entry *e, struct neighbour *neigh)
343{
344 unsigned int nud_state;
345
346 spin_lock(&e->lock);
347 if (neigh != e->neigh)
348 neigh_replace(e, neigh);
349 nud_state = neigh->nud_state;
350 if (memcmp(e->dmac, neigh->ha, sizeof(e->dmac)) ||
351 !(nud_state & NUD_VALID))
352 e->state = L2T_STATE_RESOLVING;
353 else if (nud_state & NUD_CONNECTED)
354 e->state = L2T_STATE_VALID;
355 else
356 e->state = L2T_STATE_STALE;
357 spin_unlock(&e->lock);
358}
359
360struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
361 const struct net_device *physdev,
362 unsigned int priority)
363{
364 u8 lport;
365 u16 vlan;
366 struct l2t_entry *e;
367 int addr_len = neigh->tbl->key_len;
368 u32 *addr = (u32 *)neigh->primary_key;
369 int ifidx = neigh->dev->ifindex;
370 int hash = addr_hash(addr, addr_len, ifidx);
371
372 if (neigh->dev->flags & IFF_LOOPBACK)
373 lport = netdev2pinfo(physdev)->tx_chan + 4;
374 else
375 lport = netdev2pinfo(physdev)->lport;
376
377 if (neigh->dev->priv_flags & IFF_802_1Q_VLAN)
378 vlan = vlan_dev_vlan_id(neigh->dev);
379 else
380 vlan = VLAN_NONE;
381
382 write_lock_bh(&d->lock);
383 for (e = d->l2tab[hash].first; e; e = e->next)
384 if (!addreq(e, addr) && e->ifindex == ifidx &&
385 e->vlan == vlan && e->lport == lport) {
386 l2t_hold(d, e);
387 if (atomic_read(&e->refcnt) == 1)
388 reuse_entry(e, neigh);
389 goto done;
390 }
391
392
393 e = alloc_l2e(d);
394 if (e) {
395 spin_lock(&e->lock);
396 e->state = L2T_STATE_RESOLVING;
397 if (neigh->dev->flags & IFF_LOOPBACK)
398 memcpy(e->dmac, physdev->dev_addr, sizeof(e->dmac));
399 memcpy(e->addr, addr, addr_len);
400 e->ifindex = ifidx;
401 e->hash = hash;
402 e->lport = lport;
403 e->v6 = addr_len == 16;
404 atomic_set(&e->refcnt, 1);
405 neigh_replace(e, neigh);
406 e->vlan = vlan;
407 e->next = d->l2tab[hash].first;
408 d->l2tab[hash].first = e;
409 spin_unlock(&e->lock);
410 }
411done:
412 write_unlock_bh(&d->lock);
413 return e;
414}
415EXPORT_SYMBOL(cxgb4_l2t_get);
416
417u64 cxgb4_select_ntuple(struct net_device *dev,
418 const struct l2t_entry *l2t)
419{
420 struct adapter *adap = netdev2adap(dev);
421 struct tp_params *tp = &adap->params.tp;
422 u64 ntuple = 0;
423
424
425
426
427 if (tp->vlan_shift >= 0 && l2t->vlan != VLAN_NONE)
428 ntuple |= (u64)(F_FT_VLAN_VLD | l2t->vlan) << tp->vlan_shift;
429
430 if (tp->port_shift >= 0)
431 ntuple |= (u64)l2t->lport << tp->port_shift;
432
433 if (tp->protocol_shift >= 0)
434 ntuple |= (u64)IPPROTO_TCP << tp->protocol_shift;
435
436 if (tp->vnic_shift >= 0) {
437 u32 viid = cxgb4_port_viid(dev);
438 u32 vf = FW_VIID_VIN_GET(viid);
439 u32 pf = FW_VIID_PFN_GET(viid);
440 u32 vld = FW_VIID_VIVLD_GET(viid);
441
442 ntuple |= (u64)(V_FT_VNID_ID_VF(vf) |
443 V_FT_VNID_ID_PF(pf) |
444 V_FT_VNID_ID_VLD(vld)) << tp->vnic_shift;
445 }
446
447 return ntuple;
448}
449EXPORT_SYMBOL(cxgb4_select_ntuple);
450
451
452
453
454
455
456static void handle_failed_resolution(struct adapter *adap, struct sk_buff *arpq)
457{
458 while (arpq) {
459 struct sk_buff *skb = arpq;
460 const struct l2t_skb_cb *cb = L2T_SKB_CB(skb);
461
462 arpq = skb->next;
463 skb->next = NULL;
464 if (cb->arp_err_handler)
465 cb->arp_err_handler(cb->handle, skb);
466 else
467 t4_ofld_send(adap, skb);
468 }
469}
470
471
472
473
474
475void t4_l2t_update(struct adapter *adap, struct neighbour *neigh)
476{
477 struct l2t_entry *e;
478 struct sk_buff *arpq = NULL;
479 struct l2t_data *d = adap->l2t;
480 int addr_len = neigh->tbl->key_len;
481 u32 *addr = (u32 *) neigh->primary_key;
482 int ifidx = neigh->dev->ifindex;
483 int hash = addr_hash(addr, addr_len, ifidx);
484
485 read_lock_bh(&d->lock);
486 for (e = d->l2tab[hash].first; e; e = e->next)
487 if (!addreq(e, addr) && e->ifindex == ifidx) {
488 spin_lock(&e->lock);
489 if (atomic_read(&e->refcnt))
490 goto found;
491 spin_unlock(&e->lock);
492 break;
493 }
494 read_unlock_bh(&d->lock);
495 return;
496
497 found:
498 read_unlock(&d->lock);
499
500 if (neigh != e->neigh)
501 neigh_replace(e, neigh);
502
503 if (e->state == L2T_STATE_RESOLVING) {
504 if (neigh->nud_state & NUD_FAILED) {
505 arpq = e->arpq_head;
506 e->arpq_head = e->arpq_tail = NULL;
507 } else if ((neigh->nud_state & (NUD_CONNECTED | NUD_STALE)) &&
508 e->arpq_head) {
509 write_l2e(adap, e, 1);
510 }
511 } else {
512 e->state = neigh->nud_state & NUD_CONNECTED ?
513 L2T_STATE_VALID : L2T_STATE_STALE;
514 if (memcmp(e->dmac, neigh->ha, sizeof(e->dmac)))
515 write_l2e(adap, e, 0);
516 }
517
518 spin_unlock_bh(&e->lock);
519
520 if (arpq)
521 handle_failed_resolution(adap, arpq);
522}
523
524
525
526
527
528struct l2t_entry *t4_l2t_alloc_switching(struct l2t_data *d)
529{
530 struct l2t_entry *e;
531
532 write_lock_bh(&d->lock);
533 e = alloc_l2e(d);
534 if (e) {
535 spin_lock(&e->lock);
536 e->state = L2T_STATE_SWITCHING;
537 atomic_set(&e->refcnt, 1);
538 spin_unlock(&e->lock);
539 }
540 write_unlock_bh(&d->lock);
541 return e;
542}
543
544
545
546
547int t4_l2t_set_switching(struct adapter *adap, struct l2t_entry *e, u16 vlan,
548 u8 port, u8 *eth_addr)
549{
550 e->vlan = vlan;
551 e->lport = port;
552 memcpy(e->dmac, eth_addr, ETH_ALEN);
553 return write_l2e(adap, e, 0);
554}
555
556struct l2t_data *t4_init_l2t(void)
557{
558 int i;
559 struct l2t_data *d;
560
561 d = t4_alloc_mem(sizeof(*d));
562 if (!d)
563 return NULL;
564
565 d->rover = d->l2tab;
566 atomic_set(&d->nfree, L2T_SIZE);
567 rwlock_init(&d->lock);
568
569 for (i = 0; i < L2T_SIZE; ++i) {
570 d->l2tab[i].idx = i;
571 d->l2tab[i].state = L2T_STATE_UNUSED;
572 spin_lock_init(&d->l2tab[i].lock);
573 atomic_set(&d->l2tab[i].refcnt, 0);
574 }
575 return d;
576}
577
578static inline void *l2t_get_idx(struct seq_file *seq, loff_t pos)
579{
580 struct l2t_entry *l2tab = seq->private;
581
582 return pos >= L2T_SIZE ? NULL : &l2tab[pos];
583}
584
585static void *l2t_seq_start(struct seq_file *seq, loff_t *pos)
586{
587 return *pos ? l2t_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
588}
589
590static void *l2t_seq_next(struct seq_file *seq, void *v, loff_t *pos)
591{
592 v = l2t_get_idx(seq, *pos);
593 if (v)
594 ++*pos;
595 return v;
596}
597
598static void l2t_seq_stop(struct seq_file *seq, void *v)
599{
600}
601
602static char l2e_state(const struct l2t_entry *e)
603{
604 switch (e->state) {
605 case L2T_STATE_VALID: return 'V';
606 case L2T_STATE_STALE: return 'S';
607 case L2T_STATE_SYNC_WRITE: return 'W';
608 case L2T_STATE_RESOLVING: return e->arpq_head ? 'A' : 'R';
609 case L2T_STATE_SWITCHING: return 'X';
610 default:
611 return 'U';
612 }
613}
614
615static int l2t_seq_show(struct seq_file *seq, void *v)
616{
617 if (v == SEQ_START_TOKEN)
618 seq_puts(seq, " Idx IP address "
619 "Ethernet address VLAN/P LP State Users Port\n");
620 else {
621 char ip[60];
622 struct l2t_entry *e = v;
623
624 spin_lock_bh(&e->lock);
625 if (e->state == L2T_STATE_SWITCHING)
626 ip[0] = '\0';
627 else
628 sprintf(ip, e->v6 ? "%pI6c" : "%pI4", e->addr);
629 seq_printf(seq, "%4u %-25s %17pM %4d %u %2u %c %5u %s\n",
630 e->idx, ip, e->dmac,
631 e->vlan & VLAN_VID_MASK, vlan_prio(e), e->lport,
632 l2e_state(e), atomic_read(&e->refcnt),
633 e->neigh ? e->neigh->dev->name : "");
634 spin_unlock_bh(&e->lock);
635 }
636 return 0;
637}
638
639static const struct seq_operations l2t_seq_ops = {
640 .start = l2t_seq_start,
641 .next = l2t_seq_next,
642 .stop = l2t_seq_stop,
643 .show = l2t_seq_show
644};
645
646static int l2t_seq_open(struct inode *inode, struct file *file)
647{
648 int rc = seq_open(file, &l2t_seq_ops);
649
650 if (!rc) {
651 struct adapter *adap = inode->i_private;
652 struct seq_file *seq = file->private_data;
653
654 seq->private = adap->l2t->l2tab;
655 }
656 return rc;
657}
658
659const struct file_operations t4_l2t_fops = {
660 .owner = THIS_MODULE,
661 .open = l2t_seq_open,
662 .read = seq_read,
663 .llseek = seq_lseek,
664 .release = seq_release,
665};
666