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
27 #include <asm/octeon/octeon.h>
28
29 #include "ethernet-defines.h"
30 #include "octeon-ethernet.h"
31 #include "ethernet-tx.h"
32 #include "ethernet-util.h"
33
34 #include <asm/octeon/cvmx-wqe.h>
35 #include <asm/octeon/cvmx-fau.h>
36 #include <asm/octeon/cvmx-pip.h>
37 #include <asm/octeon/cvmx-pko.h>
38 #include <asm/octeon/cvmx-helper.h>
39
40 #include <asm/octeon/cvmx-gmxx-defs.h>
41
42 #define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))
43
44 /*
45 * You can define GET_SKBUFF_QOS() to override how the skbuff output
46 * function determines which output queue is used. The default
47 * implementation always uses the base queue for the port. If, for
48 * example, you wanted to use the skb->priority field, define
49 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
50 */
51 #ifndef GET_SKBUFF_QOS
52 #define GET_SKBUFF_QOS(skb) 0
53 #endif
54
55 static void cvm_oct_tx_do_cleanup(unsigned long arg);
56 static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
57
58 /* Maximum number of SKBs to try to free per xmit packet. */
59 #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
60
cvm_oct_adjust_skb_to_free(int skb_to_free,int fau)61 static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
62 {
63 int undo;
64
65 undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
66 MAX_SKB_TO_FREE;
67 if (undo > 0)
68 cvmx_fau_atomic_add32(fau, -undo);
69 skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
70 -skb_to_free;
71 return skb_to_free;
72 }
73
cvm_oct_kick_tx_poll_watchdog(void)74 static void cvm_oct_kick_tx_poll_watchdog(void)
75 {
76 union cvmx_ciu_timx ciu_timx;
77
78 ciu_timx.u64 = 0;
79 ciu_timx.s.one_shot = 1;
80 ciu_timx.s.len = cvm_oct_tx_poll_interval;
81 cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
82 }
83
cvm_oct_free_tx_skbs(struct net_device * dev)84 static void cvm_oct_free_tx_skbs(struct net_device *dev)
85 {
86 int skb_to_free;
87 int qos, queues_per_port;
88 int total_freed = 0;
89 int total_remaining = 0;
90 unsigned long flags;
91 struct octeon_ethernet *priv = netdev_priv(dev);
92
93 queues_per_port = cvmx_pko_get_num_queues(priv->port);
94 /* Drain any pending packets in the free list */
95 for (qos = 0; qos < queues_per_port; qos++) {
96 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
97 continue;
98 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
99 MAX_SKB_TO_FREE);
100 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
101 priv->fau + qos * 4);
102 total_freed += skb_to_free;
103 if (skb_to_free > 0) {
104 struct sk_buff *to_free_list = NULL;
105
106 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
107 while (skb_to_free > 0) {
108 struct sk_buff *t;
109
110 t = __skb_dequeue(&priv->tx_free_list[qos]);
111 t->next = to_free_list;
112 to_free_list = t;
113 skb_to_free--;
114 }
115 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
116 flags);
117 /* Do the actual freeing outside of the lock. */
118 while (to_free_list) {
119 struct sk_buff *t = to_free_list;
120
121 to_free_list = to_free_list->next;
122 dev_kfree_skb_any(t);
123 }
124 }
125 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
126 }
127 if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
128 netif_wake_queue(dev);
129 if (total_remaining)
130 cvm_oct_kick_tx_poll_watchdog();
131 }
132
133 /**
134 * cvm_oct_xmit - transmit a packet
135 * @skb: Packet to send
136 * @dev: Device info structure
137 *
138 * Returns Always returns NETDEV_TX_OK
139 */
cvm_oct_xmit(struct sk_buff * skb,struct net_device * dev)140 int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
141 {
142 cvmx_pko_command_word0_t pko_command;
143 union cvmx_buf_ptr hw_buffer;
144 u64 old_scratch;
145 u64 old_scratch2;
146 int qos;
147 int i;
148 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
149 struct octeon_ethernet *priv = netdev_priv(dev);
150 struct sk_buff *to_free_list;
151 int skb_to_free;
152 int buffers_to_free;
153 u32 total_to_clean;
154 unsigned long flags;
155 #if REUSE_SKBUFFS_WITHOUT_FREE
156 unsigned char *fpa_head;
157 #endif
158
159 /*
160 * Prefetch the private data structure. It is larger than the
161 * one cache line.
162 */
163 prefetch(priv);
164
165 /*
166 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
167 * completely remove "qos" in the event neither interface
168 * supports multiple queues per port.
169 */
170 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
171 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
172 qos = GET_SKBUFF_QOS(skb);
173 if (qos <= 0)
174 qos = 0;
175 else if (qos >= cvmx_pko_get_num_queues(priv->port))
176 qos = 0;
177 } else {
178 qos = 0;
179 }
180
181 if (USE_ASYNC_IOBDMA) {
182 /* Save scratch in case userspace is using it */
183 CVMX_SYNCIOBDMA;
184 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
185 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
186
187 /*
188 * Fetch and increment the number of packets to be
189 * freed.
190 */
191 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
192 FAU_NUM_PACKET_BUFFERS_TO_FREE,
193 0);
194 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
195 priv->fau + qos * 4,
196 MAX_SKB_TO_FREE);
197 }
198
199 /*
200 * We have space for 6 segment pointers, If there will be more
201 * than that, we must linearize.
202 */
203 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
204 if (unlikely(__skb_linearize(skb))) {
205 queue_type = QUEUE_DROP;
206 if (USE_ASYNC_IOBDMA) {
207 /*
208 * Get the number of skbuffs in use
209 * by the hardware
210 */
211 CVMX_SYNCIOBDMA;
212 skb_to_free =
213 cvmx_scratch_read64(CVMX_SCR_SCRATCH);
214 } else {
215 /*
216 * Get the number of skbuffs in use
217 * by the hardware
218 */
219 skb_to_free = cvmx_fau_fetch_and_add32(
220 priv->fau + qos * 4, MAX_SKB_TO_FREE);
221 }
222 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
223 priv->fau +
224 qos * 4);
225 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
226 goto skip_xmit;
227 }
228 }
229
230 /*
231 * The CN3XXX series of parts has an errata (GMX-401) which
232 * causes the GMX block to hang if a collision occurs towards
233 * the end of a <68 byte packet. As a workaround for this, we
234 * pad packets to be 68 bytes whenever we are in half duplex
235 * mode. We don't handle the case of having a small packet but
236 * no room to add the padding. The kernel should always give
237 * us at least a cache line
238 */
239 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
240 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
241 int interface = INTERFACE(priv->port);
242 int index = INDEX(priv->port);
243
244 if (interface < 2) {
245 /* We only need to pad packet in half duplex mode */
246 gmx_prt_cfg.u64 =
247 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
248 if (gmx_prt_cfg.s.duplex == 0) {
249 int add_bytes = 64 - skb->len;
250
251 if ((skb_tail_pointer(skb) + add_bytes) <=
252 skb_end_pointer(skb))
253 memset(__skb_put(skb, add_bytes), 0,
254 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 #ifdef CONFIG_NET_CLS_ACT
373 skb->tc_verd = 0;
374 #endif /* CONFIG_NET_CLS_ACT */
375 #endif /* CONFIG_NET_SCHED */
376 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
377
378 dont_put_skbuff_in_hw:
379
380 /* Check if we can use the hardware checksumming */
381 if ((skb->protocol == htons(ETH_P_IP)) &&
382 (ip_hdr(skb)->version == 4) &&
383 (ip_hdr(skb)->ihl == 5) &&
384 ((ip_hdr(skb)->frag_off == 0) ||
385 (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
386 ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
387 (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
388 /* Use hardware checksum calc */
389 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
390 }
391
392 if (USE_ASYNC_IOBDMA) {
393 /* Get the number of skbuffs in use by the hardware */
394 CVMX_SYNCIOBDMA;
395 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
396 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
397 } else {
398 /* Get the number of skbuffs in use by the hardware */
399 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
400 MAX_SKB_TO_FREE);
401 buffers_to_free =
402 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
403 }
404
405 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
406 priv->fau + qos * 4);
407
408 /*
409 * If we're sending faster than the receive can free them then
410 * don't do the HW free.
411 */
412 if ((buffers_to_free < -100) && !pko_command.s.dontfree)
413 pko_command.s.dontfree = 1;
414
415 if (pko_command.s.dontfree) {
416 queue_type = QUEUE_CORE;
417 pko_command.s.reg0 = priv->fau + qos * 4;
418 } else {
419 queue_type = QUEUE_HW;
420 }
421 if (USE_ASYNC_IOBDMA)
422 cvmx_fau_async_fetch_and_add32(
423 CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
424
425 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
426
427 /* Drop this packet if we have too many already queued to the HW */
428 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
429 MAX_OUT_QUEUE_DEPTH)) {
430 if (dev->tx_queue_len != 0) {
431 /* Drop the lock when notifying the core. */
432 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
433 flags);
434 netif_stop_queue(dev);
435 spin_lock_irqsave(&priv->tx_free_list[qos].lock,
436 flags);
437 } else {
438 /* If not using normal queueing. */
439 queue_type = QUEUE_DROP;
440 goto skip_xmit;
441 }
442 }
443
444 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
445 CVMX_PKO_LOCK_NONE);
446
447 /* Send the packet to the output queue */
448 if (unlikely(cvmx_pko_send_packet_finish(priv->port,
449 priv->queue + qos,
450 pko_command, hw_buffer,
451 CVMX_PKO_LOCK_NONE))) {
452 printk_ratelimited("%s: Failed to send the packet\n",
453 dev->name);
454 queue_type = QUEUE_DROP;
455 }
456 skip_xmit:
457 to_free_list = NULL;
458
459 switch (queue_type) {
460 case QUEUE_DROP:
461 skb->next = to_free_list;
462 to_free_list = skb;
463 priv->stats.tx_dropped++;
464 break;
465 case QUEUE_HW:
466 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
467 break;
468 case QUEUE_CORE:
469 __skb_queue_tail(&priv->tx_free_list[qos], skb);
470 break;
471 default:
472 BUG();
473 }
474
475 while (skb_to_free > 0) {
476 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
477
478 t->next = to_free_list;
479 to_free_list = t;
480 skb_to_free--;
481 }
482
483 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
484
485 /* Do the actual freeing outside of the lock. */
486 while (to_free_list) {
487 struct sk_buff *t = to_free_list;
488
489 to_free_list = to_free_list->next;
490 dev_kfree_skb_any(t);
491 }
492
493 if (USE_ASYNC_IOBDMA) {
494 CVMX_SYNCIOBDMA;
495 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
496 /* Restore the scratch area */
497 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
498 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
499 } else {
500 total_to_clean = cvmx_fau_fetch_and_add32(
501 FAU_TOTAL_TX_TO_CLEAN, 1);
502 }
503
504 if (total_to_clean & 0x3ff) {
505 /*
506 * Schedule the cleanup tasklet every 1024 packets for
507 * the pathological case of high traffic on one port
508 * delaying clean up of packets on a different port
509 * that is blocked waiting for the cleanup.
510 */
511 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
512 }
513
514 cvm_oct_kick_tx_poll_watchdog();
515
516 return NETDEV_TX_OK;
517 }
518
519 /**
520 * cvm_oct_xmit_pow - transmit a packet to the POW
521 * @skb: Packet to send
522 * @dev: Device info structure
523
524 * Returns Always returns zero
525 */
cvm_oct_xmit_pow(struct sk_buff * skb,struct net_device * dev)526 int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
527 {
528 struct octeon_ethernet *priv = netdev_priv(dev);
529 void *packet_buffer;
530 void *copy_location;
531
532 /* Get a work queue entry */
533 cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
534
535 if (unlikely(!work)) {
536 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
537 dev->name);
538 priv->stats.tx_dropped++;
539 dev_kfree_skb_any(skb);
540 return 0;
541 }
542
543 /* Get a packet buffer */
544 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
545 if (unlikely(!packet_buffer)) {
546 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
547 dev->name);
548 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
549 priv->stats.tx_dropped++;
550 dev_kfree_skb_any(skb);
551 return 0;
552 }
553
554 /*
555 * Calculate where we need to copy the data to. We need to
556 * leave 8 bytes for a next pointer (unused). We also need to
557 * include any configure skip. Then we need to align the IP
558 * packet src and dest into the same 64bit word. The below
559 * calculation may add a little extra, but that doesn't
560 * hurt.
561 */
562 copy_location = packet_buffer + sizeof(u64);
563 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
564
565 /*
566 * We have to copy the packet since whoever processes this
567 * packet will free it to a hardware pool. We can't use the
568 * trick of counting outstanding packets like in
569 * cvm_oct_xmit.
570 */
571 memcpy(copy_location, skb->data, skb->len);
572
573 /*
574 * Fill in some of the work queue fields. We may need to add
575 * more if the software at the other end needs them.
576 */
577 if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
578 work->word0.pip.cn38xx.hw_chksum = skb->csum;
579 work->word1.len = skb->len;
580 cvmx_wqe_set_port(work, priv->port);
581 cvmx_wqe_set_qos(work, priv->port & 0x7);
582 cvmx_wqe_set_grp(work, pow_send_group);
583 work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
584 work->word1.tag = pow_send_group; /* FIXME */
585 /* Default to zero. Sets of zero later are commented out */
586 work->word2.u64 = 0;
587 work->word2.s.bufs = 1;
588 work->packet_ptr.u64 = 0;
589 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
590 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
591 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
592 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
593
594 if (skb->protocol == htons(ETH_P_IP)) {
595 work->word2.s.ip_offset = 14;
596 #if 0
597 work->word2.s.vlan_valid = 0; /* FIXME */
598 work->word2.s.vlan_cfi = 0; /* FIXME */
599 work->word2.s.vlan_id = 0; /* FIXME */
600 work->word2.s.dec_ipcomp = 0; /* FIXME */
601 #endif
602 work->word2.s.tcp_or_udp =
603 (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
604 (ip_hdr(skb)->protocol == IPPROTO_UDP);
605 #if 0
606 /* FIXME */
607 work->word2.s.dec_ipsec = 0;
608 /* We only support IPv4 right now */
609 work->word2.s.is_v6 = 0;
610 /* Hardware would set to zero */
611 work->word2.s.software = 0;
612 /* No error, packet is internal */
613 work->word2.s.L4_error = 0;
614 #endif
615 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
616 (ip_hdr(skb)->frag_off ==
617 1 << 14));
618 #if 0
619 /* Assume Linux is sending a good packet */
620 work->word2.s.IP_exc = 0;
621 #endif
622 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
623 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
624 #if 0
625 /* This is an IP packet */
626 work->word2.s.not_IP = 0;
627 /* No error, packet is internal */
628 work->word2.s.rcv_error = 0;
629 /* No error, packet is internal */
630 work->word2.s.err_code = 0;
631 #endif
632
633 /*
634 * When copying the data, include 4 bytes of the
635 * ethernet header to align the same way hardware
636 * does.
637 */
638 memcpy(work->packet_data, skb->data + 10,
639 sizeof(work->packet_data));
640 } else {
641 #if 0
642 work->word2.snoip.vlan_valid = 0; /* FIXME */
643 work->word2.snoip.vlan_cfi = 0; /* FIXME */
644 work->word2.snoip.vlan_id = 0; /* FIXME */
645 work->word2.snoip.software = 0; /* Hardware would set to zero */
646 #endif
647 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
648 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
649 work->word2.snoip.is_bcast =
650 (skb->pkt_type == PACKET_BROADCAST);
651 work->word2.snoip.is_mcast =
652 (skb->pkt_type == PACKET_MULTICAST);
653 work->word2.snoip.not_IP = 1; /* IP was done up above */
654 #if 0
655 /* No error, packet is internal */
656 work->word2.snoip.rcv_error = 0;
657 /* No error, packet is internal */
658 work->word2.snoip.err_code = 0;
659 #endif
660 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
661 }
662
663 /* Submit the packet to the POW */
664 cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
665 cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
666 priv->stats.tx_packets++;
667 priv->stats.tx_bytes += skb->len;
668 dev_consume_skb_any(skb);
669 return 0;
670 }
671
672 /**
673 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
674 * @dev: Device being shutdown
675 *
676 */
cvm_oct_tx_shutdown_dev(struct net_device * dev)677 void cvm_oct_tx_shutdown_dev(struct net_device *dev)
678 {
679 struct octeon_ethernet *priv = netdev_priv(dev);
680 unsigned long flags;
681 int qos;
682
683 for (qos = 0; qos < 16; qos++) {
684 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
685 while (skb_queue_len(&priv->tx_free_list[qos]))
686 dev_kfree_skb_any(__skb_dequeue
687 (&priv->tx_free_list[qos]));
688 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
689 }
690 }
691
cvm_oct_tx_do_cleanup(unsigned long arg)692 static void cvm_oct_tx_do_cleanup(unsigned long arg)
693 {
694 int port;
695
696 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
697 if (cvm_oct_device[port]) {
698 struct net_device *dev = cvm_oct_device[port];
699
700 cvm_oct_free_tx_skbs(dev);
701 }
702 }
703 }
704
cvm_oct_tx_cleanup_watchdog(int cpl,void * dev_id)705 static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
706 {
707 /* Disable the interrupt. */
708 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
709 /* Do the work in the tasklet. */
710 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
711 return IRQ_HANDLED;
712 }
713
cvm_oct_tx_initialize(void)714 void cvm_oct_tx_initialize(void)
715 {
716 int i;
717
718 /* Disable the interrupt. */
719 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
720 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
721 i = request_irq(OCTEON_IRQ_TIMER1,
722 cvm_oct_tx_cleanup_watchdog, 0,
723 "Ethernet", cvm_oct_device);
724
725 if (i)
726 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
727 }
728
cvm_oct_tx_shutdown(void)729 void cvm_oct_tx_shutdown(void)
730 {
731 /* Free the interrupt handler */
732 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
733 }
734