1 /*
2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Daniel Martensson
4 * Dmitry.Tarnyagin / dmitry.tarnyagin@lockless.no
5 * License terms: GNU General Public License (GPL) version 2.
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME fmt
9
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/device.h>
13 #include <linux/netdevice.h>
14 #include <linux/string.h>
15 #include <linux/list.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/sched.h>
19 #include <linux/if_arp.h>
20 #include <linux/timer.h>
21 #include <net/rtnetlink.h>
22 #include <linux/pkt_sched.h>
23 #include <net/caif/caif_layer.h>
24 #include <net/caif/caif_hsi.h>
25
26 MODULE_LICENSE("GPL");
27 MODULE_AUTHOR("Daniel Martensson");
28 MODULE_DESCRIPTION("CAIF HSI driver");
29
30 /* Returns the number of padding bytes for alignment. */
31 #define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\
32 (((pow)-((x)&((pow)-1)))))
33
34 static const struct cfhsi_config hsi_default_config = {
35
36 /* Inactivity timeout on HSI, ms */
37 .inactivity_timeout = HZ,
38
39 /* Aggregation timeout (ms) of zero means no aggregation is done*/
40 .aggregation_timeout = 1,
41
42 /*
43 * HSI link layer flow-control thresholds.
44 * Threshold values for the HSI packet queue. Flow-control will be
45 * asserted when the number of packets exceeds q_high_mark. It will
46 * not be de-asserted before the number of packets drops below
47 * q_low_mark.
48 * Warning: A high threshold value might increase throughput but it
49 * will at the same time prevent channel prioritization and increase
50 * the risk of flooding the modem. The high threshold should be above
51 * the low.
52 */
53 .q_high_mark = 100,
54 .q_low_mark = 50,
55
56 /*
57 * HSI padding options.
58 * Warning: must be a base of 2 (& operation used) and can not be zero !
59 */
60 .head_align = 4,
61 .tail_align = 4,
62 };
63
64 #define ON 1
65 #define OFF 0
66
67 static LIST_HEAD(cfhsi_list);
68
cfhsi_inactivity_tout(struct timer_list * t)69 static void cfhsi_inactivity_tout(struct timer_list *t)
70 {
71 struct cfhsi *cfhsi = from_timer(cfhsi, t, inactivity_timer);
72
73 netdev_dbg(cfhsi->ndev, "%s.\n",
74 __func__);
75
76 /* Schedule power down work queue. */
77 if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
78 queue_work(cfhsi->wq, &cfhsi->wake_down_work);
79 }
80
cfhsi_update_aggregation_stats(struct cfhsi * cfhsi,const struct sk_buff * skb,int direction)81 static void cfhsi_update_aggregation_stats(struct cfhsi *cfhsi,
82 const struct sk_buff *skb,
83 int direction)
84 {
85 struct caif_payload_info *info;
86 int hpad, tpad, len;
87
88 info = (struct caif_payload_info *)&skb->cb;
89 hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
90 tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
91 len = skb->len + hpad + tpad;
92
93 if (direction > 0)
94 cfhsi->aggregation_len += len;
95 else if (direction < 0)
96 cfhsi->aggregation_len -= len;
97 }
98
cfhsi_can_send_aggregate(struct cfhsi * cfhsi)99 static bool cfhsi_can_send_aggregate(struct cfhsi *cfhsi)
100 {
101 int i;
102
103 if (cfhsi->cfg.aggregation_timeout == 0)
104 return true;
105
106 for (i = 0; i < CFHSI_PRIO_BEBK; ++i) {
107 if (cfhsi->qhead[i].qlen)
108 return true;
109 }
110
111 /* TODO: Use aggregation_len instead */
112 if (cfhsi->qhead[CFHSI_PRIO_BEBK].qlen >= CFHSI_MAX_PKTS)
113 return true;
114
115 return false;
116 }
117
cfhsi_dequeue(struct cfhsi * cfhsi)118 static struct sk_buff *cfhsi_dequeue(struct cfhsi *cfhsi)
119 {
120 struct sk_buff *skb;
121 int i;
122
123 for (i = 0; i < CFHSI_PRIO_LAST; ++i) {
124 skb = skb_dequeue(&cfhsi->qhead[i]);
125 if (skb)
126 break;
127 }
128
129 return skb;
130 }
131
cfhsi_tx_queue_len(struct cfhsi * cfhsi)132 static int cfhsi_tx_queue_len(struct cfhsi *cfhsi)
133 {
134 int i, len = 0;
135 for (i = 0; i < CFHSI_PRIO_LAST; ++i)
136 len += skb_queue_len(&cfhsi->qhead[i]);
137 return len;
138 }
139
cfhsi_abort_tx(struct cfhsi * cfhsi)140 static void cfhsi_abort_tx(struct cfhsi *cfhsi)
141 {
142 struct sk_buff *skb;
143
144 for (;;) {
145 spin_lock_bh(&cfhsi->lock);
146 skb = cfhsi_dequeue(cfhsi);
147 if (!skb)
148 break;
149
150 cfhsi->ndev->stats.tx_errors++;
151 cfhsi->ndev->stats.tx_dropped++;
152 cfhsi_update_aggregation_stats(cfhsi, skb, -1);
153 spin_unlock_bh(&cfhsi->lock);
154 kfree_skb(skb);
155 }
156 cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
157 if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
158 mod_timer(&cfhsi->inactivity_timer,
159 jiffies + cfhsi->cfg.inactivity_timeout);
160 spin_unlock_bh(&cfhsi->lock);
161 }
162
cfhsi_flush_fifo(struct cfhsi * cfhsi)163 static int cfhsi_flush_fifo(struct cfhsi *cfhsi)
164 {
165 char buffer[32]; /* Any reasonable value */
166 size_t fifo_occupancy;
167 int ret;
168
169 netdev_dbg(cfhsi->ndev, "%s.\n",
170 __func__);
171
172 do {
173 ret = cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops,
174 &fifo_occupancy);
175 if (ret) {
176 netdev_warn(cfhsi->ndev,
177 "%s: can't get FIFO occupancy: %d.\n",
178 __func__, ret);
179 break;
180 } else if (!fifo_occupancy)
181 /* No more data, exitting normally */
182 break;
183
184 fifo_occupancy = min(sizeof(buffer), fifo_occupancy);
185 set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
186 ret = cfhsi->ops->cfhsi_rx(buffer, fifo_occupancy,
187 cfhsi->ops);
188 if (ret) {
189 clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
190 netdev_warn(cfhsi->ndev,
191 "%s: can't read data: %d.\n",
192 __func__, ret);
193 break;
194 }
195
196 ret = 5 * HZ;
197 ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait,
198 !test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret);
199
200 if (ret < 0) {
201 netdev_warn(cfhsi->ndev,
202 "%s: can't wait for flush complete: %d.\n",
203 __func__, ret);
204 break;
205 } else if (!ret) {
206 ret = -ETIMEDOUT;
207 netdev_warn(cfhsi->ndev,
208 "%s: timeout waiting for flush complete.\n",
209 __func__);
210 break;
211 }
212 } while (1);
213
214 return ret;
215 }
216
cfhsi_tx_frm(struct cfhsi_desc * desc,struct cfhsi * cfhsi)217 static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
218 {
219 int nfrms = 0;
220 int pld_len = 0;
221 struct sk_buff *skb;
222 u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
223
224 skb = cfhsi_dequeue(cfhsi);
225 if (!skb)
226 return 0;
227
228 /* Clear offset. */
229 desc->offset = 0;
230
231 /* Check if we can embed a CAIF frame. */
232 if (skb->len < CFHSI_MAX_EMB_FRM_SZ) {
233 struct caif_payload_info *info;
234 int hpad;
235 int tpad;
236
237 /* Calculate needed head alignment and tail alignment. */
238 info = (struct caif_payload_info *)&skb->cb;
239
240 hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
241 tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
242
243 /* Check if frame still fits with added alignment. */
244 if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) {
245 u8 *pemb = desc->emb_frm;
246 desc->offset = CFHSI_DESC_SHORT_SZ;
247 *pemb = (u8)(hpad - 1);
248 pemb += hpad;
249
250 /* Update network statistics. */
251 spin_lock_bh(&cfhsi->lock);
252 cfhsi->ndev->stats.tx_packets++;
253 cfhsi->ndev->stats.tx_bytes += skb->len;
254 cfhsi_update_aggregation_stats(cfhsi, skb, -1);
255 spin_unlock_bh(&cfhsi->lock);
256
257 /* Copy in embedded CAIF frame. */
258 skb_copy_bits(skb, 0, pemb, skb->len);
259
260 /* Consume the SKB */
261 consume_skb(skb);
262 skb = NULL;
263 }
264 }
265
266 /* Create payload CAIF frames. */
267 while (nfrms < CFHSI_MAX_PKTS) {
268 struct caif_payload_info *info;
269 int hpad;
270 int tpad;
271
272 if (!skb)
273 skb = cfhsi_dequeue(cfhsi);
274
275 if (!skb)
276 break;
277
278 /* Calculate needed head alignment and tail alignment. */
279 info = (struct caif_payload_info *)&skb->cb;
280
281 hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align);
282 tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.tail_align);
283
284 /* Fill in CAIF frame length in descriptor. */
285 desc->cffrm_len[nfrms] = hpad + skb->len + tpad;
286
287 /* Fill head padding information. */
288 *pfrm = (u8)(hpad - 1);
289 pfrm += hpad;
290
291 /* Update network statistics. */
292 spin_lock_bh(&cfhsi->lock);
293 cfhsi->ndev->stats.tx_packets++;
294 cfhsi->ndev->stats.tx_bytes += skb->len;
295 cfhsi_update_aggregation_stats(cfhsi, skb, -1);
296 spin_unlock_bh(&cfhsi->lock);
297
298 /* Copy in CAIF frame. */
299 skb_copy_bits(skb, 0, pfrm, skb->len);
300
301 /* Update payload length. */
302 pld_len += desc->cffrm_len[nfrms];
303
304 /* Update frame pointer. */
305 pfrm += skb->len + tpad;
306
307 /* Consume the SKB */
308 consume_skb(skb);
309 skb = NULL;
310
311 /* Update number of frames. */
312 nfrms++;
313 }
314
315 /* Unused length fields should be zero-filled (according to SPEC). */
316 while (nfrms < CFHSI_MAX_PKTS) {
317 desc->cffrm_len[nfrms] = 0x0000;
318 nfrms++;
319 }
320
321 /* Check if we can piggy-back another descriptor. */
322 if (cfhsi_can_send_aggregate(cfhsi))
323 desc->header |= CFHSI_PIGGY_DESC;
324 else
325 desc->header &= ~CFHSI_PIGGY_DESC;
326
327 return CFHSI_DESC_SZ + pld_len;
328 }
329
cfhsi_start_tx(struct cfhsi * cfhsi)330 static void cfhsi_start_tx(struct cfhsi *cfhsi)
331 {
332 struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
333 int len, res;
334
335 netdev_dbg(cfhsi->ndev, "%s.\n", __func__);
336
337 if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
338 return;
339
340 do {
341 /* Create HSI frame. */
342 len = cfhsi_tx_frm(desc, cfhsi);
343 if (!len) {
344 spin_lock_bh(&cfhsi->lock);
345 if (unlikely(cfhsi_tx_queue_len(cfhsi))) {
346 spin_unlock_bh(&cfhsi->lock);
347 res = -EAGAIN;
348 continue;
349 }
350 cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
351 /* Start inactivity timer. */
352 mod_timer(&cfhsi->inactivity_timer,
353 jiffies + cfhsi->cfg.inactivity_timeout);
354 spin_unlock_bh(&cfhsi->lock);
355 break;
356 }
357
358 /* Set up new transfer. */
359 res = cfhsi->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops);
360 if (WARN_ON(res < 0))
361 netdev_err(cfhsi->ndev, "%s: TX error %d.\n",
362 __func__, res);
363 } while (res < 0);
364 }
365
cfhsi_tx_done(struct cfhsi * cfhsi)366 static void cfhsi_tx_done(struct cfhsi *cfhsi)
367 {
368 netdev_dbg(cfhsi->ndev, "%s.\n", __func__);
369
370 if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
371 return;
372
373 /*
374 * Send flow on if flow off has been previously signalled
375 * and number of packets is below low water mark.
376 */
377 spin_lock_bh(&cfhsi->lock);
378 if (cfhsi->flow_off_sent &&
379 cfhsi_tx_queue_len(cfhsi) <= cfhsi->cfg.q_low_mark &&
380 cfhsi->cfdev.flowctrl) {
381
382 cfhsi->flow_off_sent = 0;
383 cfhsi->cfdev.flowctrl(cfhsi->ndev, ON);
384 }
385
386 if (cfhsi_can_send_aggregate(cfhsi)) {
387 spin_unlock_bh(&cfhsi->lock);
388 cfhsi_start_tx(cfhsi);
389 } else {
390 mod_timer(&cfhsi->aggregation_timer,
391 jiffies + cfhsi->cfg.aggregation_timeout);
392 spin_unlock_bh(&cfhsi->lock);
393 }
394
395 return;
396 }
397
cfhsi_tx_done_cb(struct cfhsi_cb_ops * cb_ops)398 static void cfhsi_tx_done_cb(struct cfhsi_cb_ops *cb_ops)
399 {
400 struct cfhsi *cfhsi;
401
402 cfhsi = container_of(cb_ops, struct cfhsi, cb_ops);
403 netdev_dbg(cfhsi->ndev, "%s.\n",
404 __func__);
405
406 if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
407 return;
408 cfhsi_tx_done(cfhsi);
409 }
410
cfhsi_rx_desc(struct cfhsi_desc * desc,struct cfhsi * cfhsi)411 static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
412 {
413 int xfer_sz = 0;
414 int nfrms = 0;
415 u16 *plen = NULL;
416 u8 *pfrm = NULL;
417
418 if ((desc->header & ~CFHSI_PIGGY_DESC) ||
419 (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
420 netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n",
421 __func__);
422 return -EPROTO;
423 }
424
425 /* Check for embedded CAIF frame. */
426 if (desc->offset) {
427 struct sk_buff *skb;
428 int len = 0;
429 pfrm = ((u8 *)desc) + desc->offset;
430
431 /* Remove offset padding. */
432 pfrm += *pfrm + 1;
433
434 /* Read length of CAIF frame (little endian). */
435 len = *pfrm;
436 len |= ((*(pfrm+1)) << 8) & 0xFF00;
437 len += 2; /* Add FCS fields. */
438
439 /* Sanity check length of CAIF frame. */
440 if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
441 netdev_err(cfhsi->ndev, "%s: Invalid length.\n",
442 __func__);
443 return -EPROTO;
444 }
445
446 /* Allocate SKB (OK even in IRQ context). */
447 skb = alloc_skb(len + 1, GFP_ATOMIC);
448 if (!skb) {
449 netdev_err(cfhsi->ndev, "%s: Out of memory !\n",
450 __func__);
451 return -ENOMEM;
452 }
453 caif_assert(skb != NULL);
454
455 skb_put_data(skb, pfrm, len);
456
457 skb->protocol = htons(ETH_P_CAIF);
458 skb_reset_mac_header(skb);
459 skb->dev = cfhsi->ndev;
460
461 /*
462 * We are in a callback handler and
463 * unfortunately we don't know what context we're
464 * running in.
465 */
466 if (in_interrupt())
467 netif_rx(skb);
468 else
469 netif_rx_ni(skb);
470
471 /* Update network statistics. */
472 cfhsi->ndev->stats.rx_packets++;
473 cfhsi->ndev->stats.rx_bytes += len;
474 }
475
476 /* Calculate transfer length. */
477 plen = desc->cffrm_len;
478 while (nfrms < CFHSI_MAX_PKTS && *plen) {
479 xfer_sz += *plen;
480 plen++;
481 nfrms++;
482 }
483
484 /* Check for piggy-backed descriptor. */
485 if (desc->header & CFHSI_PIGGY_DESC)
486 xfer_sz += CFHSI_DESC_SZ;
487
488 if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) {
489 netdev_err(cfhsi->ndev,
490 "%s: Invalid payload len: %d, ignored.\n",
491 __func__, xfer_sz);
492 return -EPROTO;
493 }
494 return xfer_sz;
495 }
496
cfhsi_rx_desc_len(struct cfhsi_desc * desc)497 static int cfhsi_rx_desc_len(struct cfhsi_desc *desc)
498 {
499 int xfer_sz = 0;
500 int nfrms = 0;
501 u16 *plen;
502
503 if ((desc->header & ~CFHSI_PIGGY_DESC) ||
504 (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
505
506 pr_err("Invalid descriptor. %x %x\n", desc->header,
507 desc->offset);
508 return -EPROTO;
509 }
510
511 /* Calculate transfer length. */
512 plen = desc->cffrm_len;
513 while (nfrms < CFHSI_MAX_PKTS && *plen) {
514 xfer_sz += *plen;
515 plen++;
516 nfrms++;
517 }
518
519 if (xfer_sz % 4) {
520 pr_err("Invalid payload len: %d, ignored.\n", xfer_sz);
521 return -EPROTO;
522 }
523 return xfer_sz;
524 }
525
cfhsi_rx_pld(struct cfhsi_desc * desc,struct cfhsi * cfhsi)526 static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
527 {
528 int rx_sz = 0;
529 int nfrms = 0;
530 u16 *plen = NULL;
531 u8 *pfrm = NULL;
532
533 /* Sanity check header and offset. */
534 if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) ||
535 (desc->offset > CFHSI_MAX_EMB_FRM_SZ))) {
536 netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n",
537 __func__);
538 return -EPROTO;
539 }
540
541 /* Set frame pointer to start of payload. */
542 pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
543 plen = desc->cffrm_len;
544
545 /* Skip already processed frames. */
546 while (nfrms < cfhsi->rx_state.nfrms) {
547 pfrm += *plen;
548 rx_sz += *plen;
549 plen++;
550 nfrms++;
551 }
552
553 /* Parse payload. */
554 while (nfrms < CFHSI_MAX_PKTS && *plen) {
555 struct sk_buff *skb;
556 u8 *pcffrm = NULL;
557 int len;
558
559 /* CAIF frame starts after head padding. */
560 pcffrm = pfrm + *pfrm + 1;
561
562 /* Read length of CAIF frame (little endian). */
563 len = *pcffrm;
564 len |= ((*(pcffrm + 1)) << 8) & 0xFF00;
565 len += 2; /* Add FCS fields. */
566
567 /* Sanity check length of CAIF frames. */
568 if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
569 netdev_err(cfhsi->ndev, "%s: Invalid length.\n",
570 __func__);
571 return -EPROTO;
572 }
573
574 /* Allocate SKB (OK even in IRQ context). */
575 skb = alloc_skb(len + 1, GFP_ATOMIC);
576 if (!skb) {
577 netdev_err(cfhsi->ndev, "%s: Out of memory !\n",
578 __func__);
579 cfhsi->rx_state.nfrms = nfrms;
580 return -ENOMEM;
581 }
582 caif_assert(skb != NULL);
583
584 skb_put_data(skb, pcffrm, len);
585
586 skb->protocol = htons(ETH_P_CAIF);
587 skb_reset_mac_header(skb);
588 skb->dev = cfhsi->ndev;
589
590 /*
591 * We're called in callback from HSI
592 * and don't know the context we're running in.
593 */
594 if (in_interrupt())
595 netif_rx(skb);
596 else
597 netif_rx_ni(skb);
598
599 /* Update network statistics. */
600 cfhsi->ndev->stats.rx_packets++;
601 cfhsi->ndev->stats.rx_bytes += len;
602
603 pfrm += *plen;
604 rx_sz += *plen;
605 plen++;
606 nfrms++;
607 }
608
609 return rx_sz;
610 }
611
cfhsi_rx_done(struct cfhsi * cfhsi)612 static void cfhsi_rx_done(struct cfhsi *cfhsi)
613 {
614 int res;
615 int desc_pld_len = 0, rx_len, rx_state;
616 struct cfhsi_desc *desc = NULL;
617 u8 *rx_ptr, *rx_buf;
618 struct cfhsi_desc *piggy_desc = NULL;
619
620 desc = (struct cfhsi_desc *)cfhsi->rx_buf;
621
622 netdev_dbg(cfhsi->ndev, "%s\n", __func__);
623
624 if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
625 return;
626
627 /* Update inactivity timer if pending. */
628 spin_lock_bh(&cfhsi->lock);
629 mod_timer_pending(&cfhsi->inactivity_timer,
630 jiffies + cfhsi->cfg.inactivity_timeout);
631 spin_unlock_bh(&cfhsi->lock);
632
633 if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
634 desc_pld_len = cfhsi_rx_desc_len(desc);
635
636 if (desc_pld_len < 0)
637 goto out_of_sync;
638
639 rx_buf = cfhsi->rx_buf;
640 rx_len = desc_pld_len;
641 if (desc_pld_len > 0 && (desc->header & CFHSI_PIGGY_DESC))
642 rx_len += CFHSI_DESC_SZ;
643 if (desc_pld_len == 0)
644 rx_buf = cfhsi->rx_flip_buf;
645 } else {
646 rx_buf = cfhsi->rx_flip_buf;
647
648 rx_len = CFHSI_DESC_SZ;
649 if (cfhsi->rx_state.pld_len > 0 &&
650 (desc->header & CFHSI_PIGGY_DESC)) {
651
652 piggy_desc = (struct cfhsi_desc *)
653 (desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ +
654 cfhsi->rx_state.pld_len);
655
656 cfhsi->rx_state.piggy_desc = true;
657
658 /* Extract payload len from piggy-backed descriptor. */
659 desc_pld_len = cfhsi_rx_desc_len(piggy_desc);
660 if (desc_pld_len < 0)
661 goto out_of_sync;
662
663 if (desc_pld_len > 0) {
664 rx_len = desc_pld_len;
665 if (piggy_desc->header & CFHSI_PIGGY_DESC)
666 rx_len += CFHSI_DESC_SZ;
667 }
668
669 /*
670 * Copy needed information from the piggy-backed
671 * descriptor to the descriptor in the start.
672 */
673 memcpy(rx_buf, (u8 *)piggy_desc,
674 CFHSI_DESC_SHORT_SZ);
675 }
676 }
677
678 if (desc_pld_len) {
679 rx_state = CFHSI_RX_STATE_PAYLOAD;
680 rx_ptr = rx_buf + CFHSI_DESC_SZ;
681 } else {
682 rx_state = CFHSI_RX_STATE_DESC;
683 rx_ptr = rx_buf;
684 rx_len = CFHSI_DESC_SZ;
685 }
686
687 /* Initiate next read */
688 if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) {
689 /* Set up new transfer. */
690 netdev_dbg(cfhsi->ndev, "%s: Start RX.\n",
691 __func__);
692
693 res = cfhsi->ops->cfhsi_rx(rx_ptr, rx_len,
694 cfhsi->ops);
695 if (WARN_ON(res < 0)) {
696 netdev_err(cfhsi->ndev, "%s: RX error %d.\n",
697 __func__, res);
698 cfhsi->ndev->stats.rx_errors++;
699 cfhsi->ndev->stats.rx_dropped++;
700 }
701 }
702
703 if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
704 /* Extract payload from descriptor */
705 if (cfhsi_rx_desc(desc, cfhsi) < 0)
706 goto out_of_sync;
707 } else {
708 /* Extract payload */
709 if (cfhsi_rx_pld(desc, cfhsi) < 0)
710 goto out_of_sync;
711 if (piggy_desc) {
712 /* Extract any payload in piggyback descriptor. */
713 if (cfhsi_rx_desc(piggy_desc, cfhsi) < 0)
714 goto out_of_sync;
715 /* Mark no embedded frame after extracting it */
716 piggy_desc->offset = 0;
717 }
718 }
719
720 /* Update state info */
721 memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state));
722 cfhsi->rx_state.state = rx_state;
723 cfhsi->rx_ptr = rx_ptr;
724 cfhsi->rx_len = rx_len;
725 cfhsi->rx_state.pld_len = desc_pld_len;
726 cfhsi->rx_state.piggy_desc = desc->header & CFHSI_PIGGY_DESC;
727
728 if (rx_buf != cfhsi->rx_buf)
729 swap(cfhsi->rx_buf, cfhsi->rx_flip_buf);
730 return;
731
732 out_of_sync:
733 netdev_err(cfhsi->ndev, "%s: Out of sync.\n", __func__);
734 print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE,
735 cfhsi->rx_buf, CFHSI_DESC_SZ);
736 schedule_work(&cfhsi->out_of_sync_work);
737 }
738
cfhsi_rx_slowpath(struct timer_list * t)739 static void cfhsi_rx_slowpath(struct timer_list *t)
740 {
741 struct cfhsi *cfhsi = from_timer(cfhsi, t, rx_slowpath_timer);
742
743 netdev_dbg(cfhsi->ndev, "%s.\n",
744 __func__);
745
746 cfhsi_rx_done(cfhsi);
747 }
748
cfhsi_rx_done_cb(struct cfhsi_cb_ops * cb_ops)749 static void cfhsi_rx_done_cb(struct cfhsi_cb_ops *cb_ops)
750 {
751 struct cfhsi *cfhsi;
752
753 cfhsi = container_of(cb_ops, struct cfhsi, cb_ops);
754 netdev_dbg(cfhsi->ndev, "%s.\n",
755 __func__);
756
757 if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
758 return;
759
760 if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits))
761 wake_up_interruptible(&cfhsi->flush_fifo_wait);
762 else
763 cfhsi_rx_done(cfhsi);
764 }
765
cfhsi_wake_up(struct work_struct * work)766 static void cfhsi_wake_up(struct work_struct *work)
767 {
768 struct cfhsi *cfhsi = NULL;
769 int res;
770 int len;
771 long ret;
772
773 cfhsi = container_of(work, struct cfhsi, wake_up_work);
774
775 if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
776 return;
777
778 if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) {
779 /* It happenes when wakeup is requested by
780 * both ends at the same time. */
781 clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
782 clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
783 return;
784 }
785
786 /* Activate wake line. */
787 cfhsi->ops->cfhsi_wake_up(cfhsi->ops);
788
789 netdev_dbg(cfhsi->ndev, "%s: Start waiting.\n",
790 __func__);
791
792 /* Wait for acknowledge. */
793 ret = CFHSI_WAKE_TOUT;
794 ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait,
795 test_and_clear_bit(CFHSI_WAKE_UP_ACK,
796 &cfhsi->bits), ret);
797 if (unlikely(ret < 0)) {
798 /* Interrupted by signal. */
799 netdev_err(cfhsi->ndev, "%s: Signalled: %ld.\n",
800 __func__, ret);
801
802 clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
803 cfhsi->ops->cfhsi_wake_down(cfhsi->ops);
804 return;
805 } else if (!ret) {
806 bool ca_wake = false;
807 size_t fifo_occupancy = 0;
808
809 /* Wakeup timeout */
810 netdev_dbg(cfhsi->ndev, "%s: Timeout.\n",
811 __func__);
812
813 /* Check FIFO to check if modem has sent something. */
814 WARN_ON(cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops,
815 &fifo_occupancy));
816
817 netdev_dbg(cfhsi->ndev, "%s: Bytes in FIFO: %u.\n",
818 __func__, (unsigned) fifo_occupancy);
819
820 /* Check if we misssed the interrupt. */
821 WARN_ON(cfhsi->ops->cfhsi_get_peer_wake(cfhsi->ops,
822 &ca_wake));
823
824 if (ca_wake) {
825 netdev_err(cfhsi->ndev, "%s: CA Wake missed !.\n",
826 __func__);
827
828 /* Clear the CFHSI_WAKE_UP_ACK bit to prevent race. */
829 clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
830
831 /* Continue execution. */
832 goto wake_ack;
833 }
834
835 clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
836 cfhsi->ops->cfhsi_wake_down(cfhsi->ops);
837 return;
838 }
839 wake_ack:
840 netdev_dbg(cfhsi->ndev, "%s: Woken.\n",
841 __func__);
842
843 /* Clear power up bit. */
844 set_bit(CFHSI_AWAKE, &cfhsi->bits);
845 clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
846
847 /* Resume read operation. */
848 netdev_dbg(cfhsi->ndev, "%s: Start RX.\n", __func__);
849 res = cfhsi->ops->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->ops);
850
851 if (WARN_ON(res < 0))
852 netdev_err(cfhsi->ndev, "%s: RX err %d.\n", __func__, res);
853
854 /* Clear power up acknowledment. */
855 clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
856
857 spin_lock_bh(&cfhsi->lock);
858
859 /* Resume transmit if queues are not empty. */
860 if (!cfhsi_tx_queue_len(cfhsi)) {
861 netdev_dbg(cfhsi->ndev, "%s: Peer wake, start timer.\n",
862 __func__);
863 /* Start inactivity timer. */
864 mod_timer(&cfhsi->inactivity_timer,
865 jiffies + cfhsi->cfg.inactivity_timeout);
866 spin_unlock_bh(&cfhsi->lock);
867 return;
868 }
869
870 netdev_dbg(cfhsi->ndev, "%s: Host wake.\n",
871 __func__);
872
873 spin_unlock_bh(&cfhsi->lock);
874
875 /* Create HSI frame. */
876 len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi);
877
878 if (likely(len > 0)) {
879 /* Set up new transfer. */
880 res = cfhsi->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops);
881 if (WARN_ON(res < 0)) {
882 netdev_err(cfhsi->ndev, "%s: TX error %d.\n",
883 __func__, res);
884 cfhsi_abort_tx(cfhsi);
885 }
886 } else {
887 netdev_err(cfhsi->ndev,
888 "%s: Failed to create HSI frame: %d.\n",
889 __func__, len);
890 }
891 }
892
cfhsi_wake_down(struct work_struct * work)893 static void cfhsi_wake_down(struct work_struct *work)
894 {
895 long ret;
896 struct cfhsi *cfhsi = NULL;
897 size_t fifo_occupancy = 0;
898 int retry = CFHSI_WAKE_TOUT;
899
900 cfhsi = container_of(work, struct cfhsi, wake_down_work);
901 netdev_dbg(cfhsi->ndev, "%s.\n", __func__);
902
903 if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
904 return;
905
906 /* Deactivate wake line. */
907 cfhsi->ops->cfhsi_wake_down(cfhsi->ops);
908
909 /* Wait for acknowledge. */
910 ret = CFHSI_WAKE_TOUT;
911 ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait,
912 test_and_clear_bit(CFHSI_WAKE_DOWN_ACK,
913 &cfhsi->bits), ret);
914 if (ret < 0) {
915 /* Interrupted by signal. */
916 netdev_err(cfhsi->ndev, "%s: Signalled: %ld.\n",
917 __func__, ret);
918 return;
919 } else if (!ret) {
920 bool ca_wake = true;
921
922 /* Timeout */
923 netdev_err(cfhsi->ndev, "%s: Timeout.\n", __func__);
924
925 /* Check if we misssed the interrupt. */
926 WARN_ON(cfhsi->ops->cfhsi_get_peer_wake(cfhsi->ops,
927 &ca_wake));
928 if (!ca_wake)
929 netdev_err(cfhsi->ndev, "%s: CA Wake missed !.\n",
930 __func__);
931 }
932
933 /* Check FIFO occupancy. */
934 while (retry) {
935 WARN_ON(cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops,
936 &fifo_occupancy));
937
938 if (!fifo_occupancy)
939 break;
940
941 set_current_state(TASK_INTERRUPTIBLE);
942 schedule_timeout(1);
943 retry--;
944 }
945
946 if (!retry)
947 netdev_err(cfhsi->ndev, "%s: FIFO Timeout.\n", __func__);
948
949 /* Clear AWAKE condition. */
950 clear_bit(CFHSI_AWAKE, &cfhsi->bits);
951
952 /* Cancel pending RX requests. */
953 cfhsi->ops->cfhsi_rx_cancel(cfhsi->ops);
954 }
955
cfhsi_out_of_sync(struct work_struct * work)956 static void cfhsi_out_of_sync(struct work_struct *work)
957 {
958 struct cfhsi *cfhsi = NULL;
959
960 cfhsi = container_of(work, struct cfhsi, out_of_sync_work);
961
962 rtnl_lock();
963 dev_close(cfhsi->ndev);
964 rtnl_unlock();
965 }
966
cfhsi_wake_up_cb(struct cfhsi_cb_ops * cb_ops)967 static void cfhsi_wake_up_cb(struct cfhsi_cb_ops *cb_ops)
968 {
969 struct cfhsi *cfhsi = NULL;
970
971 cfhsi = container_of(cb_ops, struct cfhsi, cb_ops);
972 netdev_dbg(cfhsi->ndev, "%s.\n",
973 __func__);
974
975 set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
976 wake_up_interruptible(&cfhsi->wake_up_wait);
977
978 if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
979 return;
980
981 /* Schedule wake up work queue if the peer initiates. */
982 if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits))
983 queue_work(cfhsi->wq, &cfhsi->wake_up_work);
984 }
985
cfhsi_wake_down_cb(struct cfhsi_cb_ops * cb_ops)986 static void cfhsi_wake_down_cb(struct cfhsi_cb_ops *cb_ops)
987 {
988 struct cfhsi *cfhsi = NULL;
989
990 cfhsi = container_of(cb_ops, struct cfhsi, cb_ops);
991 netdev_dbg(cfhsi->ndev, "%s.\n",
992 __func__);
993
994 /* Initiating low power is only permitted by the host (us). */
995 set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits);
996 wake_up_interruptible(&cfhsi->wake_down_wait);
997 }
998
cfhsi_aggregation_tout(struct timer_list * t)999 static void cfhsi_aggregation_tout(struct timer_list *t)
1000 {
1001 struct cfhsi *cfhsi = from_timer(cfhsi, t, aggregation_timer);
1002
1003 netdev_dbg(cfhsi->ndev, "%s.\n",
1004 __func__);
1005
1006 cfhsi_start_tx(cfhsi);
1007 }
1008
cfhsi_xmit(struct sk_buff * skb,struct net_device * dev)1009 static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev)
1010 {
1011 struct cfhsi *cfhsi = NULL;
1012 int start_xfer = 0;
1013 int timer_active;
1014 int prio;
1015
1016 if (!dev)
1017 return -EINVAL;
1018
1019 cfhsi = netdev_priv(dev);
1020
1021 switch (skb->priority) {
1022 case TC_PRIO_BESTEFFORT:
1023 case TC_PRIO_FILLER:
1024 case TC_PRIO_BULK:
1025 prio = CFHSI_PRIO_BEBK;
1026 break;
1027 case TC_PRIO_INTERACTIVE_BULK:
1028 prio = CFHSI_PRIO_VI;
1029 break;
1030 case TC_PRIO_INTERACTIVE:
1031 prio = CFHSI_PRIO_VO;
1032 break;
1033 case TC_PRIO_CONTROL:
1034 default:
1035 prio = CFHSI_PRIO_CTL;
1036 break;
1037 }
1038
1039 spin_lock_bh(&cfhsi->lock);
1040
1041 /* Update aggregation statistics */
1042 cfhsi_update_aggregation_stats(cfhsi, skb, 1);
1043
1044 /* Queue the SKB */
1045 skb_queue_tail(&cfhsi->qhead[prio], skb);
1046
1047 /* Sanity check; xmit should not be called after unregister_netdev */
1048 if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) {
1049 spin_unlock_bh(&cfhsi->lock);
1050 cfhsi_abort_tx(cfhsi);
1051 return -EINVAL;
1052 }
1053
1054 /* Send flow off if number of packets is above high water mark. */
1055 if (!cfhsi->flow_off_sent &&
1056 cfhsi_tx_queue_len(cfhsi) > cfhsi->cfg.q_high_mark &&
1057 cfhsi->cfdev.flowctrl) {
1058 cfhsi->flow_off_sent = 1;
1059 cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF);
1060 }
1061
1062 if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) {
1063 cfhsi->tx_state = CFHSI_TX_STATE_XFER;
1064 start_xfer = 1;
1065 }
1066
1067 if (!start_xfer) {
1068 /* Send aggregate if it is possible */
1069 bool aggregate_ready =
1070 cfhsi_can_send_aggregate(cfhsi) &&
1071 del_timer(&cfhsi->aggregation_timer) > 0;
1072 spin_unlock_bh(&cfhsi->lock);
1073 if (aggregate_ready)
1074 cfhsi_start_tx(cfhsi);
1075 return 0;
1076 }
1077
1078 /* Delete inactivity timer if started. */
1079 timer_active = del_timer_sync(&cfhsi->inactivity_timer);
1080
1081 spin_unlock_bh(&cfhsi->lock);
1082
1083 if (timer_active) {
1084 struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
1085 int len;
1086 int res;
1087
1088 /* Create HSI frame. */
1089 len = cfhsi_tx_frm(desc, cfhsi);
1090 WARN_ON(!len);
1091
1092 /* Set up new transfer. */
1093 res = cfhsi->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops);
1094 if (WARN_ON(res < 0)) {
1095 netdev_err(cfhsi->ndev, "%s: TX error %d.\n",
1096 __func__, res);
1097 cfhsi_abort_tx(cfhsi);
1098 }
1099 } else {
1100 /* Schedule wake up work queue if the we initiate. */
1101 if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits))
1102 queue_work(cfhsi->wq, &cfhsi->wake_up_work);
1103 }
1104
1105 return 0;
1106 }
1107
1108 static const struct net_device_ops cfhsi_netdevops;
1109
cfhsi_setup(struct net_device * dev)1110 static void cfhsi_setup(struct net_device *dev)
1111 {
1112 int i;
1113 struct cfhsi *cfhsi = netdev_priv(dev);
1114 dev->features = 0;
1115 dev->type = ARPHRD_CAIF;
1116 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1117 dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ;
1118 dev->priv_flags |= IFF_NO_QUEUE;
1119 dev->needs_free_netdev = true;
1120 dev->netdev_ops = &cfhsi_netdevops;
1121 for (i = 0; i < CFHSI_PRIO_LAST; ++i)
1122 skb_queue_head_init(&cfhsi->qhead[i]);
1123 cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW;
1124 cfhsi->cfdev.use_frag = false;
1125 cfhsi->cfdev.use_stx = false;
1126 cfhsi->cfdev.use_fcs = false;
1127 cfhsi->ndev = dev;
1128 cfhsi->cfg = hsi_default_config;
1129 }
1130
cfhsi_open(struct net_device * ndev)1131 static int cfhsi_open(struct net_device *ndev)
1132 {
1133 struct cfhsi *cfhsi = netdev_priv(ndev);
1134 int res;
1135
1136 clear_bit(CFHSI_SHUTDOWN, &cfhsi->bits);
1137
1138 /* Initialize state vaiables. */
1139 cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
1140 cfhsi->rx_state.state = CFHSI_RX_STATE_DESC;
1141
1142 /* Set flow info */
1143 cfhsi->flow_off_sent = 0;
1144
1145 /*
1146 * Allocate a TX buffer with the size of a HSI packet descriptors
1147 * and the necessary room for CAIF payload frames.
1148 */
1149 cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL);
1150 if (!cfhsi->tx_buf) {
1151 res = -ENODEV;
1152 goto err_alloc_tx;
1153 }
1154
1155 /*
1156 * Allocate a RX buffer with the size of two HSI packet descriptors and
1157 * the necessary room for CAIF payload frames.
1158 */
1159 cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
1160 if (!cfhsi->rx_buf) {
1161 res = -ENODEV;
1162 goto err_alloc_rx;
1163 }
1164
1165 cfhsi->rx_flip_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
1166 if (!cfhsi->rx_flip_buf) {
1167 res = -ENODEV;
1168 goto err_alloc_rx_flip;
1169 }
1170
1171 /* Initialize aggregation timeout */
1172 cfhsi->cfg.aggregation_timeout = hsi_default_config.aggregation_timeout;
1173
1174 /* Initialize recieve vaiables. */
1175 cfhsi->rx_ptr = cfhsi->rx_buf;
1176 cfhsi->rx_len = CFHSI_DESC_SZ;
1177
1178 /* Initialize spin locks. */
1179 spin_lock_init(&cfhsi->lock);
1180
1181 /* Set up the driver. */
1182 cfhsi->cb_ops.tx_done_cb = cfhsi_tx_done_cb;
1183 cfhsi->cb_ops.rx_done_cb = cfhsi_rx_done_cb;
1184 cfhsi->cb_ops.wake_up_cb = cfhsi_wake_up_cb;
1185 cfhsi->cb_ops.wake_down_cb = cfhsi_wake_down_cb;
1186
1187 /* Initialize the work queues. */
1188 INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up);
1189 INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down);
1190 INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync);
1191
1192 /* Clear all bit fields. */
1193 clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
1194 clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits);
1195 clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
1196 clear_bit(CFHSI_AWAKE, &cfhsi->bits);
1197
1198 /* Create work thread. */
1199 cfhsi->wq = alloc_ordered_workqueue(cfhsi->ndev->name, WQ_MEM_RECLAIM);
1200 if (!cfhsi->wq) {
1201 netdev_err(cfhsi->ndev, "%s: Failed to create work queue.\n",
1202 __func__);
1203 res = -ENODEV;
1204 goto err_create_wq;
1205 }
1206
1207 /* Initialize wait queues. */
1208 init_waitqueue_head(&cfhsi->wake_up_wait);
1209 init_waitqueue_head(&cfhsi->wake_down_wait);
1210 init_waitqueue_head(&cfhsi->flush_fifo_wait);
1211
1212 /* Setup the inactivity timer. */
1213 timer_setup(&cfhsi->inactivity_timer, cfhsi_inactivity_tout, 0);
1214 /* Setup the slowpath RX timer. */
1215 timer_setup(&cfhsi->rx_slowpath_timer, cfhsi_rx_slowpath, 0);
1216 /* Setup the aggregation timer. */
1217 timer_setup(&cfhsi->aggregation_timer, cfhsi_aggregation_tout, 0);
1218
1219 /* Activate HSI interface. */
1220 res = cfhsi->ops->cfhsi_up(cfhsi->ops);
1221 if (res) {
1222 netdev_err(cfhsi->ndev,
1223 "%s: can't activate HSI interface: %d.\n",
1224 __func__, res);
1225 goto err_activate;
1226 }
1227
1228 /* Flush FIFO */
1229 res = cfhsi_flush_fifo(cfhsi);
1230 if (res) {
1231 netdev_err(cfhsi->ndev, "%s: Can't flush FIFO: %d.\n",
1232 __func__, res);
1233 goto err_net_reg;
1234 }
1235 return res;
1236
1237 err_net_reg:
1238 cfhsi->ops->cfhsi_down(cfhsi->ops);
1239 err_activate:
1240 destroy_workqueue(cfhsi->wq);
1241 err_create_wq:
1242 kfree(cfhsi->rx_flip_buf);
1243 err_alloc_rx_flip:
1244 kfree(cfhsi->rx_buf);
1245 err_alloc_rx:
1246 kfree(cfhsi->tx_buf);
1247 err_alloc_tx:
1248 return res;
1249 }
1250
cfhsi_close(struct net_device * ndev)1251 static int cfhsi_close(struct net_device *ndev)
1252 {
1253 struct cfhsi *cfhsi = netdev_priv(ndev);
1254 u8 *tx_buf, *rx_buf, *flip_buf;
1255
1256 /* going to shutdown driver */
1257 set_bit(CFHSI_SHUTDOWN, &cfhsi->bits);
1258
1259 /* Delete timers if pending */
1260 del_timer_sync(&cfhsi->inactivity_timer);
1261 del_timer_sync(&cfhsi->rx_slowpath_timer);
1262 del_timer_sync(&cfhsi->aggregation_timer);
1263
1264 /* Cancel pending RX request (if any) */
1265 cfhsi->ops->cfhsi_rx_cancel(cfhsi->ops);
1266
1267 /* Destroy workqueue */
1268 destroy_workqueue(cfhsi->wq);
1269
1270 /* Store bufferes: will be freed later. */
1271 tx_buf = cfhsi->tx_buf;
1272 rx_buf = cfhsi->rx_buf;
1273 flip_buf = cfhsi->rx_flip_buf;
1274 /* Flush transmit queues. */
1275 cfhsi_abort_tx(cfhsi);
1276
1277 /* Deactivate interface */
1278 cfhsi->ops->cfhsi_down(cfhsi->ops);
1279
1280 /* Free buffers. */
1281 kfree(tx_buf);
1282 kfree(rx_buf);
1283 kfree(flip_buf);
1284 return 0;
1285 }
1286
cfhsi_uninit(struct net_device * dev)1287 static void cfhsi_uninit(struct net_device *dev)
1288 {
1289 struct cfhsi *cfhsi = netdev_priv(dev);
1290 ASSERT_RTNL();
1291 symbol_put(cfhsi_get_device);
1292 list_del(&cfhsi->list);
1293 }
1294
1295 static const struct net_device_ops cfhsi_netdevops = {
1296 .ndo_uninit = cfhsi_uninit,
1297 .ndo_open = cfhsi_open,
1298 .ndo_stop = cfhsi_close,
1299 .ndo_start_xmit = cfhsi_xmit
1300 };
1301
cfhsi_netlink_parms(struct nlattr * data[],struct cfhsi * cfhsi)1302 static void cfhsi_netlink_parms(struct nlattr *data[], struct cfhsi *cfhsi)
1303 {
1304 int i;
1305
1306 if (!data) {
1307 pr_debug("no params data found\n");
1308 return;
1309 }
1310
1311 i = __IFLA_CAIF_HSI_INACTIVITY_TOUT;
1312 /*
1313 * Inactivity timeout in millisecs. Lowest possible value is 1,
1314 * and highest possible is NEXT_TIMER_MAX_DELTA.
1315 */
1316 if (data[i]) {
1317 u32 inactivity_timeout = nla_get_u32(data[i]);
1318 /* Pre-calculate inactivity timeout. */
1319 cfhsi->cfg.inactivity_timeout = inactivity_timeout * HZ / 1000;
1320 if (cfhsi->cfg.inactivity_timeout == 0)
1321 cfhsi->cfg.inactivity_timeout = 1;
1322 else if (cfhsi->cfg.inactivity_timeout > NEXT_TIMER_MAX_DELTA)
1323 cfhsi->cfg.inactivity_timeout = NEXT_TIMER_MAX_DELTA;
1324 }
1325
1326 i = __IFLA_CAIF_HSI_AGGREGATION_TOUT;
1327 if (data[i])
1328 cfhsi->cfg.aggregation_timeout = nla_get_u32(data[i]);
1329
1330 i = __IFLA_CAIF_HSI_HEAD_ALIGN;
1331 if (data[i])
1332 cfhsi->cfg.head_align = nla_get_u32(data[i]);
1333
1334 i = __IFLA_CAIF_HSI_TAIL_ALIGN;
1335 if (data[i])
1336 cfhsi->cfg.tail_align = nla_get_u32(data[i]);
1337
1338 i = __IFLA_CAIF_HSI_QHIGH_WATERMARK;
1339 if (data[i])
1340 cfhsi->cfg.q_high_mark = nla_get_u32(data[i]);
1341
1342 i = __IFLA_CAIF_HSI_QLOW_WATERMARK;
1343 if (data[i])
1344 cfhsi->cfg.q_low_mark = nla_get_u32(data[i]);
1345 }
1346
caif_hsi_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1347 static int caif_hsi_changelink(struct net_device *dev, struct nlattr *tb[],
1348 struct nlattr *data[],
1349 struct netlink_ext_ack *extack)
1350 {
1351 cfhsi_netlink_parms(data, netdev_priv(dev));
1352 netdev_state_change(dev);
1353 return 0;
1354 }
1355
1356 static const struct nla_policy caif_hsi_policy[__IFLA_CAIF_HSI_MAX + 1] = {
1357 [__IFLA_CAIF_HSI_INACTIVITY_TOUT] = { .type = NLA_U32, .len = 4 },
1358 [__IFLA_CAIF_HSI_AGGREGATION_TOUT] = { .type = NLA_U32, .len = 4 },
1359 [__IFLA_CAIF_HSI_HEAD_ALIGN] = { .type = NLA_U32, .len = 4 },
1360 [__IFLA_CAIF_HSI_TAIL_ALIGN] = { .type = NLA_U32, .len = 4 },
1361 [__IFLA_CAIF_HSI_QHIGH_WATERMARK] = { .type = NLA_U32, .len = 4 },
1362 [__IFLA_CAIF_HSI_QLOW_WATERMARK] = { .type = NLA_U32, .len = 4 },
1363 };
1364
caif_hsi_get_size(const struct net_device * dev)1365 static size_t caif_hsi_get_size(const struct net_device *dev)
1366 {
1367 int i;
1368 size_t s = 0;
1369 for (i = __IFLA_CAIF_HSI_UNSPEC + 1; i < __IFLA_CAIF_HSI_MAX; i++)
1370 s += nla_total_size(caif_hsi_policy[i].len);
1371 return s;
1372 }
1373
caif_hsi_fill_info(struct sk_buff * skb,const struct net_device * dev)1374 static int caif_hsi_fill_info(struct sk_buff *skb, const struct net_device *dev)
1375 {
1376 struct cfhsi *cfhsi = netdev_priv(dev);
1377
1378 if (nla_put_u32(skb, __IFLA_CAIF_HSI_INACTIVITY_TOUT,
1379 cfhsi->cfg.inactivity_timeout) ||
1380 nla_put_u32(skb, __IFLA_CAIF_HSI_AGGREGATION_TOUT,
1381 cfhsi->cfg.aggregation_timeout) ||
1382 nla_put_u32(skb, __IFLA_CAIF_HSI_HEAD_ALIGN,
1383 cfhsi->cfg.head_align) ||
1384 nla_put_u32(skb, __IFLA_CAIF_HSI_TAIL_ALIGN,
1385 cfhsi->cfg.tail_align) ||
1386 nla_put_u32(skb, __IFLA_CAIF_HSI_QHIGH_WATERMARK,
1387 cfhsi->cfg.q_high_mark) ||
1388 nla_put_u32(skb, __IFLA_CAIF_HSI_QLOW_WATERMARK,
1389 cfhsi->cfg.q_low_mark))
1390 return -EMSGSIZE;
1391
1392 return 0;
1393 }
1394
caif_hsi_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1395 static int caif_hsi_newlink(struct net *src_net, struct net_device *dev,
1396 struct nlattr *tb[], struct nlattr *data[],
1397 struct netlink_ext_ack *extack)
1398 {
1399 struct cfhsi *cfhsi = NULL;
1400 struct cfhsi_ops *(*get_ops)(void);
1401
1402 ASSERT_RTNL();
1403
1404 cfhsi = netdev_priv(dev);
1405 cfhsi_netlink_parms(data, cfhsi);
1406
1407 get_ops = symbol_get(cfhsi_get_ops);
1408 if (!get_ops) {
1409 pr_err("%s: failed to get the cfhsi_ops\n", __func__);
1410 return -ENODEV;
1411 }
1412
1413 /* Assign the HSI device. */
1414 cfhsi->ops = (*get_ops)();
1415 if (!cfhsi->ops) {
1416 pr_err("%s: failed to get the cfhsi_ops\n", __func__);
1417 goto err;
1418 }
1419
1420 /* Assign the driver to this HSI device. */
1421 cfhsi->ops->cb_ops = &cfhsi->cb_ops;
1422 if (register_netdevice(dev)) {
1423 pr_warn("%s: caif_hsi device registration failed\n", __func__);
1424 goto err;
1425 }
1426 /* Add CAIF HSI device to list. */
1427 list_add_tail(&cfhsi->list, &cfhsi_list);
1428
1429 return 0;
1430 err:
1431 symbol_put(cfhsi_get_ops);
1432 return -ENODEV;
1433 }
1434
1435 static struct rtnl_link_ops caif_hsi_link_ops __read_mostly = {
1436 .kind = "cfhsi",
1437 .priv_size = sizeof(struct cfhsi),
1438 .setup = cfhsi_setup,
1439 .maxtype = __IFLA_CAIF_HSI_MAX,
1440 .policy = caif_hsi_policy,
1441 .newlink = caif_hsi_newlink,
1442 .changelink = caif_hsi_changelink,
1443 .get_size = caif_hsi_get_size,
1444 .fill_info = caif_hsi_fill_info,
1445 };
1446
cfhsi_exit_module(void)1447 static void __exit cfhsi_exit_module(void)
1448 {
1449 struct list_head *list_node;
1450 struct list_head *n;
1451 struct cfhsi *cfhsi;
1452
1453 rtnl_link_unregister(&caif_hsi_link_ops);
1454
1455 rtnl_lock();
1456 list_for_each_safe(list_node, n, &cfhsi_list) {
1457 cfhsi = list_entry(list_node, struct cfhsi, list);
1458 unregister_netdev(cfhsi->ndev);
1459 }
1460 rtnl_unlock();
1461 }
1462
cfhsi_init_module(void)1463 static int __init cfhsi_init_module(void)
1464 {
1465 return rtnl_link_register(&caif_hsi_link_ops);
1466 }
1467
1468 module_init(cfhsi_init_module);
1469 module_exit(cfhsi_exit_module);
1470
