1 /*
2 * This file is based on code from OCTEON SDK by Cavium Networks.
3 *
4 * Copyright (c) 2003-2010 Cavium Networks
5 *
6 * This file is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, Version 2, as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <linux/ip.h>
16 #include <linux/ratelimit.h>
17 #include <linux/string.h>
18 #include <linux/interrupt.h>
19 #include <net/dst.h>
20 #ifdef CONFIG_XFRM
21 #include <linux/xfrm.h>
22 #include <net/xfrm.h>
23 #endif /* CONFIG_XFRM */
24
25 #include <linux/atomic.h>
26 #include <net/sch_generic.h>
27
28 #include <asm/octeon/octeon.h>
29
30 #include "ethernet-defines.h"
31 #include "octeon-ethernet.h"
32 #include "ethernet-tx.h"
33 #include "ethernet-util.h"
34
35 #include <asm/octeon/cvmx-wqe.h>
36 #include <asm/octeon/cvmx-fau.h>
37 #include <asm/octeon/cvmx-pip.h>
38 #include <asm/octeon/cvmx-pko.h>
39 #include <asm/octeon/cvmx-helper.h>
40
41 #include <asm/octeon/cvmx-gmxx-defs.h>
42
43 #define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))
44
45 /*
46 * You can define GET_SKBUFF_QOS() to override how the skbuff output
47 * function determines which output queue is used. The default
48 * implementation always uses the base queue for the port. If, for
49 * example, you wanted to use the skb->priority field, define
50 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
51 */
52 #ifndef GET_SKBUFF_QOS
53 #define GET_SKBUFF_QOS(skb) 0
54 #endif
55
56 static void cvm_oct_tx_do_cleanup(unsigned long arg);
57 static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
58
59 /* Maximum number of SKBs to try to free per xmit packet. */
60 #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
61
cvm_oct_adjust_skb_to_free(int skb_to_free,int fau)62 static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
63 {
64 int undo;
65
66 undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
67 MAX_SKB_TO_FREE;
68 if (undo > 0)
69 cvmx_fau_atomic_add32(fau, -undo);
70 skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
71 -skb_to_free;
72 return skb_to_free;
73 }
74
cvm_oct_kick_tx_poll_watchdog(void)75 static void cvm_oct_kick_tx_poll_watchdog(void)
76 {
77 union cvmx_ciu_timx ciu_timx;
78
79 ciu_timx.u64 = 0;
80 ciu_timx.s.one_shot = 1;
81 ciu_timx.s.len = cvm_oct_tx_poll_interval;
82 cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
83 }
84
cvm_oct_free_tx_skbs(struct net_device * dev)85 static void cvm_oct_free_tx_skbs(struct net_device *dev)
86 {
87 int skb_to_free;
88 int qos, queues_per_port;
89 int total_freed = 0;
90 int total_remaining = 0;
91 unsigned long flags;
92 struct octeon_ethernet *priv = netdev_priv(dev);
93
94 queues_per_port = cvmx_pko_get_num_queues(priv->port);
95 /* Drain any pending packets in the free list */
96 for (qos = 0; qos < queues_per_port; qos++) {
97 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
98 continue;
99 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
100 MAX_SKB_TO_FREE);
101 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
102 priv->fau + qos * 4);
103 total_freed += skb_to_free;
104 if (skb_to_free > 0) {
105 struct sk_buff *to_free_list = NULL;
106
107 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
108 while (skb_to_free > 0) {
109 struct sk_buff *t;
110
111 t = __skb_dequeue(&priv->tx_free_list[qos]);
112 t->next = to_free_list;
113 to_free_list = t;
114 skb_to_free--;
115 }
116 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
117 flags);
118 /* Do the actual freeing outside of the lock. */
119 while (to_free_list) {
120 struct sk_buff *t = to_free_list;
121
122 to_free_list = to_free_list->next;
123 dev_kfree_skb_any(t);
124 }
125 }
126 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
127 }
128 if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
129 netif_wake_queue(dev);
130 if (total_remaining)
131 cvm_oct_kick_tx_poll_watchdog();
132 }
133
134 /**
135 * cvm_oct_xmit - transmit a packet
136 * @skb: Packet to send
137 * @dev: Device info structure
138 *
139 * Returns Always returns NETDEV_TX_OK
140 */
cvm_oct_xmit(struct sk_buff * skb,struct net_device * dev)141 int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
142 {
143 cvmx_pko_command_word0_t pko_command;
144 union cvmx_buf_ptr hw_buffer;
145 u64 old_scratch;
146 u64 old_scratch2;
147 int qos;
148 int i;
149 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
150 struct octeon_ethernet *priv = netdev_priv(dev);
151 struct sk_buff *to_free_list;
152 int skb_to_free;
153 int buffers_to_free;
154 u32 total_to_clean;
155 unsigned long flags;
156 #if REUSE_SKBUFFS_WITHOUT_FREE
157 unsigned char *fpa_head;
158 #endif
159
160 /*
161 * Prefetch the private data structure. It is larger than the
162 * one cache line.
163 */
164 prefetch(priv);
165
166 /*
167 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
168 * completely remove "qos" in the event neither interface
169 * supports multiple queues per port.
170 */
171 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
172 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
173 qos = GET_SKBUFF_QOS(skb);
174 if (qos <= 0)
175 qos = 0;
176 else if (qos >= cvmx_pko_get_num_queues(priv->port))
177 qos = 0;
178 } else {
179 qos = 0;
180 }
181
182 if (USE_ASYNC_IOBDMA) {
183 /* Save scratch in case userspace is using it */
184 CVMX_SYNCIOBDMA;
185 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
186 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
187
188 /*
189 * Fetch and increment the number of packets to be
190 * freed.
191 */
192 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
193 FAU_NUM_PACKET_BUFFERS_TO_FREE,
194 0);
195 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
196 priv->fau + qos * 4,
197 MAX_SKB_TO_FREE);
198 }
199
200 /*
201 * We have space for 6 segment pointers, If there will be more
202 * than that, we must linearize.
203 */
204 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
205 if (unlikely(__skb_linearize(skb))) {
206 queue_type = QUEUE_DROP;
207 if (USE_ASYNC_IOBDMA) {
208 /*
209 * Get the number of skbuffs in use
210 * by the hardware
211 */
212 CVMX_SYNCIOBDMA;
213 skb_to_free =
214 cvmx_scratch_read64(CVMX_SCR_SCRATCH);
215 } else {
216 /*
217 * Get the number of skbuffs in use
218 * by the hardware
219 */
220 skb_to_free = cvmx_fau_fetch_and_add32(
221 priv->fau + qos * 4, MAX_SKB_TO_FREE);
222 }
223 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
224 priv->fau +
225 qos * 4);
226 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
227 goto skip_xmit;
228 }
229 }
230
231 /*
232 * The CN3XXX series of parts has an errata (GMX-401) which
233 * causes the GMX block to hang if a collision occurs towards
234 * the end of a <68 byte packet. As a workaround for this, we
235 * pad packets to be 68 bytes whenever we are in half duplex
236 * mode. We don't handle the case of having a small packet but
237 * no room to add the padding. The kernel should always give
238 * us at least a cache line
239 */
240 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
241 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
242 int interface = INTERFACE(priv->port);
243 int index = INDEX(priv->port);
244
245 if (interface < 2) {
246 /* We only need to pad packet in half duplex mode */
247 gmx_prt_cfg.u64 =
248 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
249 if (gmx_prt_cfg.s.duplex == 0) {
250 int add_bytes = 64 - skb->len;
251
252 if ((skb_tail_pointer(skb) + add_bytes) <=
253 skb_end_pointer(skb))
254 __skb_put_zero(skb, add_bytes);
255 }
256 }
257 }
258
259 /* Build the PKO command */
260 pko_command.u64 = 0;
261 #ifdef __LITTLE_ENDIAN
262 pko_command.s.le = 1;
263 #endif
264 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
265 pko_command.s.segs = 1;
266 pko_command.s.total_bytes = skb->len;
267 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
268 pko_command.s.subone0 = 1;
269
270 pko_command.s.dontfree = 1;
271
272 /* Build the PKO buffer pointer */
273 hw_buffer.u64 = 0;
274 if (skb_shinfo(skb)->nr_frags == 0) {
275 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
276 hw_buffer.s.pool = 0;
277 hw_buffer.s.size = skb->len;
278 } else {
279 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
280 hw_buffer.s.pool = 0;
281 hw_buffer.s.size = skb_headlen(skb);
282 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
283 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
284 struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i;
285
286 hw_buffer.s.addr = XKPHYS_TO_PHYS(
287 (u64)(page_address(fs->page.p) +
288 fs->page_offset));
289 hw_buffer.s.size = fs->size;
290 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
291 }
292 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
293 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
294 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
295 pko_command.s.gather = 1;
296 goto dont_put_skbuff_in_hw;
297 }
298
299 /*
300 * See if we can put this skb in the FPA pool. Any strange
301 * behavior from the Linux networking stack will most likely
302 * be caused by a bug in the following code. If some field is
303 * in use by the network stack and gets carried over when a
304 * buffer is reused, bad things may happen. If in doubt and
305 * you dont need the absolute best performance, disable the
306 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
307 * shown a 25% increase in performance under some loads.
308 */
309 #if REUSE_SKBUFFS_WITHOUT_FREE
310 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
311 if (unlikely(skb->data < fpa_head)) {
312 /* TX buffer beginning can't meet FPA alignment constraints */
313 goto dont_put_skbuff_in_hw;
314 }
315 if (unlikely
316 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
317 /* TX buffer isn't large enough for the FPA */
318 goto dont_put_skbuff_in_hw;
319 }
320 if (unlikely(skb_shared(skb))) {
321 /* TX buffer sharing data with someone else */
322 goto dont_put_skbuff_in_hw;
323 }
324 if (unlikely(skb_cloned(skb))) {
325 /* TX buffer has been cloned */
326 goto dont_put_skbuff_in_hw;
327 }
328 if (unlikely(skb_header_cloned(skb))) {
329 /* TX buffer header has been cloned */
330 goto dont_put_skbuff_in_hw;
331 }
332 if (unlikely(skb->destructor)) {
333 /* TX buffer has a destructor */
334 goto dont_put_skbuff_in_hw;
335 }
336 if (unlikely(skb_shinfo(skb)->nr_frags)) {
337 /* TX buffer has fragments */
338 goto dont_put_skbuff_in_hw;
339 }
340 if (unlikely
341 (skb->truesize !=
342 sizeof(*skb) + skb_end_offset(skb))) {
343 /* TX buffer truesize has been changed */
344 goto dont_put_skbuff_in_hw;
345 }
346
347 /*
348 * We can use this buffer in the FPA. We don't need the FAU
349 * update anymore
350 */
351 pko_command.s.dontfree = 0;
352
353 hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
354 ((unsigned long)fpa_head >> 7);
355
356 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
357
358 /*
359 * The skbuff will be reused without ever being freed. We must
360 * cleanup a bunch of core things.
361 */
362 dst_release(skb_dst(skb));
363 skb_dst_set(skb, NULL);
364 #ifdef CONFIG_XFRM
365 secpath_put(skb->sp);
366 skb->sp = NULL;
367 #endif
368 nf_reset(skb);
369
370 #ifdef CONFIG_NET_SCHED
371 skb->tc_index = 0;
372 skb_reset_tc(skb);
373 #endif /* CONFIG_NET_SCHED */
374 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
375
376 dont_put_skbuff_in_hw:
377
378 /* Check if we can use the hardware checksumming */
379 if ((skb->protocol == htons(ETH_P_IP)) &&
380 (ip_hdr(skb)->version == 4) &&
381 (ip_hdr(skb)->ihl == 5) &&
382 ((ip_hdr(skb)->frag_off == 0) ||
383 (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
384 ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
385 (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
386 /* Use hardware checksum calc */
387 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
388 }
389
390 if (USE_ASYNC_IOBDMA) {
391 /* Get the number of skbuffs in use by the hardware */
392 CVMX_SYNCIOBDMA;
393 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
394 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
395 } else {
396 /* Get the number of skbuffs in use by the hardware */
397 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
398 MAX_SKB_TO_FREE);
399 buffers_to_free =
400 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
401 }
402
403 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
404 priv->fau + qos * 4);
405
406 /*
407 * If we're sending faster than the receive can free them then
408 * don't do the HW free.
409 */
410 if ((buffers_to_free < -100) && !pko_command.s.dontfree)
411 pko_command.s.dontfree = 1;
412
413 if (pko_command.s.dontfree) {
414 queue_type = QUEUE_CORE;
415 pko_command.s.reg0 = priv->fau + qos * 4;
416 } else {
417 queue_type = QUEUE_HW;
418 }
419 if (USE_ASYNC_IOBDMA)
420 cvmx_fau_async_fetch_and_add32(
421 CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
422
423 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
424
425 /* Drop this packet if we have too many already queued to the HW */
426 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
427 MAX_OUT_QUEUE_DEPTH)) {
428 if (dev->tx_queue_len != 0) {
429 /* Drop the lock when notifying the core. */
430 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
431 flags);
432 netif_stop_queue(dev);
433 spin_lock_irqsave(&priv->tx_free_list[qos].lock,
434 flags);
435 } else {
436 /* If not using normal queueing. */
437 queue_type = QUEUE_DROP;
438 goto skip_xmit;
439 }
440 }
441
442 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
443 CVMX_PKO_LOCK_NONE);
444
445 /* Send the packet to the output queue */
446 if (unlikely(cvmx_pko_send_packet_finish(priv->port,
447 priv->queue + qos,
448 pko_command, hw_buffer,
449 CVMX_PKO_LOCK_NONE))) {
450 printk_ratelimited("%s: Failed to send the packet\n",
451 dev->name);
452 queue_type = QUEUE_DROP;
453 }
454 skip_xmit:
455 to_free_list = NULL;
456
457 switch (queue_type) {
458 case QUEUE_DROP:
459 skb->next = to_free_list;
460 to_free_list = skb;
461 dev->stats.tx_dropped++;
462 break;
463 case QUEUE_HW:
464 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
465 break;
466 case QUEUE_CORE:
467 __skb_queue_tail(&priv->tx_free_list[qos], skb);
468 break;
469 default:
470 BUG();
471 }
472
473 while (skb_to_free > 0) {
474 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
475
476 t->next = to_free_list;
477 to_free_list = t;
478 skb_to_free--;
479 }
480
481 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
482
483 /* Do the actual freeing outside of the lock. */
484 while (to_free_list) {
485 struct sk_buff *t = to_free_list;
486
487 to_free_list = to_free_list->next;
488 dev_kfree_skb_any(t);
489 }
490
491 if (USE_ASYNC_IOBDMA) {
492 CVMX_SYNCIOBDMA;
493 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
494 /* Restore the scratch area */
495 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
496 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
497 } else {
498 total_to_clean = cvmx_fau_fetch_and_add32(
499 FAU_TOTAL_TX_TO_CLEAN, 1);
500 }
501
502 if (total_to_clean & 0x3ff) {
503 /*
504 * Schedule the cleanup tasklet every 1024 packets for
505 * the pathological case of high traffic on one port
506 * delaying clean up of packets on a different port
507 * that is blocked waiting for the cleanup.
508 */
509 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
510 }
511
512 cvm_oct_kick_tx_poll_watchdog();
513
514 return NETDEV_TX_OK;
515 }
516
517 /**
518 * cvm_oct_xmit_pow - transmit a packet to the POW
519 * @skb: Packet to send
520 * @dev: Device info structure
521
522 * Returns Always returns zero
523 */
cvm_oct_xmit_pow(struct sk_buff * skb,struct net_device * dev)524 int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
525 {
526 struct octeon_ethernet *priv = netdev_priv(dev);
527 void *packet_buffer;
528 void *copy_location;
529
530 /* Get a work queue entry */
531 cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
532
533 if (unlikely(!work)) {
534 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
535 dev->name);
536 dev->stats.tx_dropped++;
537 dev_kfree_skb_any(skb);
538 return 0;
539 }
540
541 /* Get a packet buffer */
542 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
543 if (unlikely(!packet_buffer)) {
544 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
545 dev->name);
546 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
547 dev->stats.tx_dropped++;
548 dev_kfree_skb_any(skb);
549 return 0;
550 }
551
552 /*
553 * Calculate where we need to copy the data to. We need to
554 * leave 8 bytes for a next pointer (unused). We also need to
555 * include any configure skip. Then we need to align the IP
556 * packet src and dest into the same 64bit word. The below
557 * calculation may add a little extra, but that doesn't
558 * hurt.
559 */
560 copy_location = packet_buffer + sizeof(u64);
561 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
562
563 /*
564 * We have to copy the packet since whoever processes this
565 * packet will free it to a hardware pool. We can't use the
566 * trick of counting outstanding packets like in
567 * cvm_oct_xmit.
568 */
569 memcpy(copy_location, skb->data, skb->len);
570
571 /*
572 * Fill in some of the work queue fields. We may need to add
573 * more if the software at the other end needs them.
574 */
575 if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
576 work->word0.pip.cn38xx.hw_chksum = skb->csum;
577 work->word1.len = skb->len;
578 cvmx_wqe_set_port(work, priv->port);
579 cvmx_wqe_set_qos(work, priv->port & 0x7);
580 cvmx_wqe_set_grp(work, pow_send_group);
581 work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
582 work->word1.tag = pow_send_group; /* FIXME */
583 /* Default to zero. Sets of zero later are commented out */
584 work->word2.u64 = 0;
585 work->word2.s.bufs = 1;
586 work->packet_ptr.u64 = 0;
587 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
588 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
589 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
590 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
591
592 if (skb->protocol == htons(ETH_P_IP)) {
593 work->word2.s.ip_offset = 14;
594 #if 0
595 work->word2.s.vlan_valid = 0; /* FIXME */
596 work->word2.s.vlan_cfi = 0; /* FIXME */
597 work->word2.s.vlan_id = 0; /* FIXME */
598 work->word2.s.dec_ipcomp = 0; /* FIXME */
599 #endif
600 work->word2.s.tcp_or_udp =
601 (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
602 (ip_hdr(skb)->protocol == IPPROTO_UDP);
603 #if 0
604 /* FIXME */
605 work->word2.s.dec_ipsec = 0;
606 /* We only support IPv4 right now */
607 work->word2.s.is_v6 = 0;
608 /* Hardware would set to zero */
609 work->word2.s.software = 0;
610 /* No error, packet is internal */
611 work->word2.s.L4_error = 0;
612 #endif
613 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
614 (ip_hdr(skb)->frag_off ==
615 1 << 14));
616 #if 0
617 /* Assume Linux is sending a good packet */
618 work->word2.s.IP_exc = 0;
619 #endif
620 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
621 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
622 #if 0
623 /* This is an IP packet */
624 work->word2.s.not_IP = 0;
625 /* No error, packet is internal */
626 work->word2.s.rcv_error = 0;
627 /* No error, packet is internal */
628 work->word2.s.err_code = 0;
629 #endif
630
631 /*
632 * When copying the data, include 4 bytes of the
633 * ethernet header to align the same way hardware
634 * does.
635 */
636 memcpy(work->packet_data, skb->data + 10,
637 sizeof(work->packet_data));
638 } else {
639 #if 0
640 work->word2.snoip.vlan_valid = 0; /* FIXME */
641 work->word2.snoip.vlan_cfi = 0; /* FIXME */
642 work->word2.snoip.vlan_id = 0; /* FIXME */
643 work->word2.snoip.software = 0; /* Hardware would set to zero */
644 #endif
645 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
646 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
647 work->word2.snoip.is_bcast =
648 (skb->pkt_type == PACKET_BROADCAST);
649 work->word2.snoip.is_mcast =
650 (skb->pkt_type == PACKET_MULTICAST);
651 work->word2.snoip.not_IP = 1; /* IP was done up above */
652 #if 0
653 /* No error, packet is internal */
654 work->word2.snoip.rcv_error = 0;
655 /* No error, packet is internal */
656 work->word2.snoip.err_code = 0;
657 #endif
658 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
659 }
660
661 /* Submit the packet to the POW */
662 cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
663 cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
664 dev->stats.tx_packets++;
665 dev->stats.tx_bytes += skb->len;
666 dev_consume_skb_any(skb);
667 return 0;
668 }
669
670 /**
671 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
672 * @dev: Device being shutdown
673 *
674 */
cvm_oct_tx_shutdown_dev(struct net_device * dev)675 void cvm_oct_tx_shutdown_dev(struct net_device *dev)
676 {
677 struct octeon_ethernet *priv = netdev_priv(dev);
678 unsigned long flags;
679 int qos;
680
681 for (qos = 0; qos < 16; qos++) {
682 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
683 while (skb_queue_len(&priv->tx_free_list[qos]))
684 dev_kfree_skb_any(__skb_dequeue
685 (&priv->tx_free_list[qos]));
686 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
687 }
688 }
689
cvm_oct_tx_do_cleanup(unsigned long arg)690 static void cvm_oct_tx_do_cleanup(unsigned long arg)
691 {
692 int port;
693
694 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
695 if (cvm_oct_device[port]) {
696 struct net_device *dev = cvm_oct_device[port];
697
698 cvm_oct_free_tx_skbs(dev);
699 }
700 }
701 }
702
cvm_oct_tx_cleanup_watchdog(int cpl,void * dev_id)703 static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
704 {
705 /* Disable the interrupt. */
706 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
707 /* Do the work in the tasklet. */
708 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
709 return IRQ_HANDLED;
710 }
711
cvm_oct_tx_initialize(void)712 void cvm_oct_tx_initialize(void)
713 {
714 int i;
715
716 /* Disable the interrupt. */
717 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
718 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
719 i = request_irq(OCTEON_IRQ_TIMER1,
720 cvm_oct_tx_cleanup_watchdog, 0,
721 "Ethernet", cvm_oct_device);
722
723 if (i)
724 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
725 }
726
cvm_oct_tx_shutdown(void)727 void cvm_oct_tx_shutdown(void)
728 {
729 /* Free the interrupt handler */
730 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
731 }
732