1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * This file is based on code from OCTEON SDK by Cavium Networks.
4 *
5 * Copyright (c) 2003-2010 Cavium Networks
6 */
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <linux/ip.h>
13 #include <linux/ratelimit.h>
14 #include <linux/string.h>
15 #include <linux/interrupt.h>
16 #include <net/dst.h>
17 #ifdef CONFIG_XFRM
18 #include <linux/xfrm.h>
19 #include <net/xfrm.h>
20 #endif /* CONFIG_XFRM */
21
22 #include <linux/atomic.h>
23 #include <net/sch_generic.h>
24
25 #include "octeon-ethernet.h"
26 #include "ethernet-defines.h"
27 #include "ethernet-tx.h"
28 #include "ethernet-util.h"
29
30 #define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))
31
32 /*
33 * You can define GET_SKBUFF_QOS() to override how the skbuff output
34 * function determines which output queue is used. The default
35 * implementation always uses the base queue for the port. If, for
36 * example, you wanted to use the skb->priority field, define
37 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
38 */
39 #ifndef GET_SKBUFF_QOS
40 #define GET_SKBUFF_QOS(skb) 0
41 #endif
42
43 static void cvm_oct_tx_do_cleanup(struct tasklet_struct *clean);
44 static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup);
45
46 /* Maximum number of SKBs to try to free per xmit packet. */
47 #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
48
cvm_oct_adjust_skb_to_free(int skb_to_free,int fau)49 static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
50 {
51 int undo;
52
53 undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
54 MAX_SKB_TO_FREE;
55 if (undo > 0)
56 cvmx_fau_atomic_add32(fau, -undo);
57 skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
58 -skb_to_free;
59 return skb_to_free;
60 }
61
cvm_oct_kick_tx_poll_watchdog(void)62 static void cvm_oct_kick_tx_poll_watchdog(void)
63 {
64 union cvmx_ciu_timx ciu_timx;
65
66 ciu_timx.u64 = 0;
67 ciu_timx.s.one_shot = 1;
68 ciu_timx.s.len = cvm_oct_tx_poll_interval;
69 cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
70 }
71
cvm_oct_free_tx_skbs(struct net_device * dev)72 static void cvm_oct_free_tx_skbs(struct net_device *dev)
73 {
74 int skb_to_free;
75 int qos, queues_per_port;
76 int total_remaining = 0;
77 unsigned long flags;
78 struct octeon_ethernet *priv = netdev_priv(dev);
79
80 queues_per_port = cvmx_pko_get_num_queues(priv->port);
81 /* Drain any pending packets in the free list */
82 for (qos = 0; qos < queues_per_port; qos++) {
83 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
84 continue;
85 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
86 MAX_SKB_TO_FREE);
87 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
88 priv->fau + qos * 4);
89 if (skb_to_free > 0) {
90 struct sk_buff *to_free_list = NULL;
91
92 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
93 while (skb_to_free > 0) {
94 struct sk_buff *t;
95
96 t = __skb_dequeue(&priv->tx_free_list[qos]);
97 t->next = to_free_list;
98 to_free_list = t;
99 skb_to_free--;
100 }
101 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
102 flags);
103 /* Do the actual freeing outside of the lock. */
104 while (to_free_list) {
105 struct sk_buff *t = to_free_list;
106
107 to_free_list = to_free_list->next;
108 dev_kfree_skb_any(t);
109 }
110 }
111 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
112 }
113 if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
114 netif_wake_queue(dev);
115 if (total_remaining)
116 cvm_oct_kick_tx_poll_watchdog();
117 }
118
119 /**
120 * cvm_oct_xmit - transmit a packet
121 * @skb: Packet to send
122 * @dev: Device info structure
123 *
124 * Returns Always returns NETDEV_TX_OK
125 */
cvm_oct_xmit(struct sk_buff * skb,struct net_device * dev)126 netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
127 {
128 union cvmx_pko_command_word0 pko_command;
129 union cvmx_buf_ptr hw_buffer;
130 u64 old_scratch;
131 u64 old_scratch2;
132 int qos;
133 int i;
134 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
135 struct octeon_ethernet *priv = netdev_priv(dev);
136 struct sk_buff *to_free_list;
137 int skb_to_free;
138 int buffers_to_free;
139 u32 total_to_clean;
140 unsigned long flags;
141 #if REUSE_SKBUFFS_WITHOUT_FREE
142 unsigned char *fpa_head;
143 #endif
144
145 /*
146 * Prefetch the private data structure. It is larger than the
147 * one cache line.
148 */
149 prefetch(priv);
150
151 /*
152 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
153 * completely remove "qos" in the event neither interface
154 * supports multiple queues per port.
155 */
156 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
157 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
158 qos = GET_SKBUFF_QOS(skb);
159 if (qos <= 0)
160 qos = 0;
161 else if (qos >= cvmx_pko_get_num_queues(priv->port))
162 qos = 0;
163 } else {
164 qos = 0;
165 }
166
167 if (USE_ASYNC_IOBDMA) {
168 /* Save scratch in case userspace is using it */
169 CVMX_SYNCIOBDMA;
170 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
171 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
172
173 /*
174 * Fetch and increment the number of packets to be
175 * freed.
176 */
177 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
178 FAU_NUM_PACKET_BUFFERS_TO_FREE,
179 0);
180 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
181 priv->fau + qos * 4,
182 MAX_SKB_TO_FREE);
183 }
184
185 /*
186 * We have space for 6 segment pointers, If there will be more
187 * than that, we must linearize.
188 */
189 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
190 if (unlikely(__skb_linearize(skb))) {
191 queue_type = QUEUE_DROP;
192 if (USE_ASYNC_IOBDMA) {
193 /*
194 * Get the number of skbuffs in use
195 * by the hardware
196 */
197 CVMX_SYNCIOBDMA;
198 skb_to_free =
199 cvmx_scratch_read64(CVMX_SCR_SCRATCH);
200 } else {
201 /*
202 * Get the number of skbuffs in use
203 * by the hardware
204 */
205 skb_to_free =
206 cvmx_fau_fetch_and_add32(priv->fau +
207 qos * 4,
208 MAX_SKB_TO_FREE);
209 }
210 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
211 priv->fau +
212 qos * 4);
213 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
214 goto skip_xmit;
215 }
216 }
217
218 /*
219 * The CN3XXX series of parts has an errata (GMX-401) which
220 * causes the GMX block to hang if a collision occurs towards
221 * the end of a <68 byte packet. As a workaround for this, we
222 * pad packets to be 68 bytes whenever we are in half duplex
223 * mode. We don't handle the case of having a small packet but
224 * no room to add the padding. The kernel should always give
225 * us at least a cache line
226 */
227 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
228 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
229 int interface = INTERFACE(priv->port);
230 int index = INDEX(priv->port);
231
232 if (interface < 2) {
233 /* We only need to pad packet in half duplex mode */
234 gmx_prt_cfg.u64 =
235 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
236 if (gmx_prt_cfg.s.duplex == 0) {
237 int add_bytes = 64 - skb->len;
238
239 if ((skb_tail_pointer(skb) + add_bytes) <=
240 skb_end_pointer(skb))
241 __skb_put_zero(skb, add_bytes);
242 }
243 }
244 }
245
246 /* Build the PKO command */
247 pko_command.u64 = 0;
248 #ifdef __LITTLE_ENDIAN
249 pko_command.s.le = 1;
250 #endif
251 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
252 pko_command.s.segs = 1;
253 pko_command.s.total_bytes = skb->len;
254 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
255 pko_command.s.subone0 = 1;
256
257 pko_command.s.dontfree = 1;
258
259 /* Build the PKO buffer pointer */
260 hw_buffer.u64 = 0;
261 if (skb_shinfo(skb)->nr_frags == 0) {
262 hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
263 hw_buffer.s.pool = 0;
264 hw_buffer.s.size = skb->len;
265 } else {
266 hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
267 hw_buffer.s.pool = 0;
268 hw_buffer.s.size = skb_headlen(skb);
269 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
270 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
271 skb_frag_t *fs = skb_shinfo(skb)->frags + i;
272
273 hw_buffer.s.addr =
274 XKPHYS_TO_PHYS((uintptr_t)skb_frag_address(fs));
275 hw_buffer.s.size = skb_frag_size(fs);
276 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
277 }
278 hw_buffer.s.addr =
279 XKPHYS_TO_PHYS((uintptr_t)CVM_OCT_SKB_CB(skb));
280 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
281 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
282 pko_command.s.gather = 1;
283 goto dont_put_skbuff_in_hw;
284 }
285
286 /*
287 * See if we can put this skb in the FPA pool. Any strange
288 * behavior from the Linux networking stack will most likely
289 * be caused by a bug in the following code. If some field is
290 * in use by the network stack and gets carried over when a
291 * buffer is reused, bad things may happen. If in doubt and
292 * you dont need the absolute best performance, disable the
293 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
294 * shown a 25% increase in performance under some loads.
295 */
296 #if REUSE_SKBUFFS_WITHOUT_FREE
297 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
298 if (unlikely(skb->data < fpa_head)) {
299 /* TX buffer beginning can't meet FPA alignment constraints */
300 goto dont_put_skbuff_in_hw;
301 }
302 if (unlikely
303 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
304 /* TX buffer isn't large enough for the FPA */
305 goto dont_put_skbuff_in_hw;
306 }
307 if (unlikely(skb_shared(skb))) {
308 /* TX buffer sharing data with someone else */
309 goto dont_put_skbuff_in_hw;
310 }
311 if (unlikely(skb_cloned(skb))) {
312 /* TX buffer has been cloned */
313 goto dont_put_skbuff_in_hw;
314 }
315 if (unlikely(skb_header_cloned(skb))) {
316 /* TX buffer header has been cloned */
317 goto dont_put_skbuff_in_hw;
318 }
319 if (unlikely(skb->destructor)) {
320 /* TX buffer has a destructor */
321 goto dont_put_skbuff_in_hw;
322 }
323 if (unlikely(skb_shinfo(skb)->nr_frags)) {
324 /* TX buffer has fragments */
325 goto dont_put_skbuff_in_hw;
326 }
327 if (unlikely
328 (skb->truesize !=
329 sizeof(*skb) + skb_end_offset(skb))) {
330 /* TX buffer truesize has been changed */
331 goto dont_put_skbuff_in_hw;
332 }
333
334 /*
335 * We can use this buffer in the FPA. We don't need the FAU
336 * update anymore
337 */
338 pko_command.s.dontfree = 0;
339
340 hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
341 ((unsigned long)fpa_head >> 7);
342
343 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
344
345 /*
346 * The skbuff will be reused without ever being freed. We must
347 * cleanup a bunch of core things.
348 */
349 skb_dst_drop(skb);
350 skb_ext_reset(skb);
351 nf_reset_ct(skb);
352 skb_reset_redirect(skb);
353
354 #ifdef CONFIG_NET_SCHED
355 skb->tc_index = 0;
356 #endif /* CONFIG_NET_SCHED */
357 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
358
359 dont_put_skbuff_in_hw:
360
361 /* Check if we can use the hardware checksumming */
362 if ((skb->protocol == htons(ETH_P_IP)) &&
363 (ip_hdr(skb)->version == 4) &&
364 (ip_hdr(skb)->ihl == 5) &&
365 ((ip_hdr(skb)->frag_off == 0) ||
366 (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
367 ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
368 (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
369 /* Use hardware checksum calc */
370 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
371 }
372
373 if (USE_ASYNC_IOBDMA) {
374 /* Get the number of skbuffs in use by the hardware */
375 CVMX_SYNCIOBDMA;
376 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
377 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
378 } else {
379 /* Get the number of skbuffs in use by the hardware */
380 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
381 MAX_SKB_TO_FREE);
382 buffers_to_free =
383 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
384 }
385
386 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
387 priv->fau + qos * 4);
388
389 /*
390 * If we're sending faster than the receive can free them then
391 * don't do the HW free.
392 */
393 if ((buffers_to_free < -100) && !pko_command.s.dontfree)
394 pko_command.s.dontfree = 1;
395
396 if (pko_command.s.dontfree) {
397 queue_type = QUEUE_CORE;
398 pko_command.s.reg0 = priv->fau + qos * 4;
399 } else {
400 queue_type = QUEUE_HW;
401 }
402 if (USE_ASYNC_IOBDMA)
403 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
404 FAU_TOTAL_TX_TO_CLEAN, 1);
405
406 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
407
408 /* Drop this packet if we have too many already queued to the HW */
409 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
410 MAX_OUT_QUEUE_DEPTH)) {
411 if (dev->tx_queue_len != 0) {
412 /* Drop the lock when notifying the core. */
413 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
414 flags);
415 netif_stop_queue(dev);
416 spin_lock_irqsave(&priv->tx_free_list[qos].lock,
417 flags);
418 } else {
419 /* If not using normal queueing. */
420 queue_type = QUEUE_DROP;
421 goto skip_xmit;
422 }
423 }
424
425 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
426 CVMX_PKO_LOCK_NONE);
427
428 /* Send the packet to the output queue */
429 if (unlikely(cvmx_pko_send_packet_finish(priv->port,
430 priv->queue + qos,
431 pko_command, hw_buffer,
432 CVMX_PKO_LOCK_NONE))) {
433 printk_ratelimited("%s: Failed to send the packet\n",
434 dev->name);
435 queue_type = QUEUE_DROP;
436 }
437 skip_xmit:
438 to_free_list = NULL;
439
440 switch (queue_type) {
441 case QUEUE_DROP:
442 skb->next = to_free_list;
443 to_free_list = skb;
444 dev->stats.tx_dropped++;
445 break;
446 case QUEUE_HW:
447 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
448 break;
449 case QUEUE_CORE:
450 __skb_queue_tail(&priv->tx_free_list[qos], skb);
451 break;
452 default:
453 BUG();
454 }
455
456 while (skb_to_free > 0) {
457 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
458
459 t->next = to_free_list;
460 to_free_list = t;
461 skb_to_free--;
462 }
463
464 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
465
466 /* Do the actual freeing outside of the lock. */
467 while (to_free_list) {
468 struct sk_buff *t = to_free_list;
469
470 to_free_list = to_free_list->next;
471 dev_kfree_skb_any(t);
472 }
473
474 if (USE_ASYNC_IOBDMA) {
475 CVMX_SYNCIOBDMA;
476 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
477 /* Restore the scratch area */
478 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
479 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
480 } else {
481 total_to_clean =
482 cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
483 }
484
485 if (total_to_clean & 0x3ff) {
486 /*
487 * Schedule the cleanup tasklet every 1024 packets for
488 * the pathological case of high traffic on one port
489 * delaying clean up of packets on a different port
490 * that is blocked waiting for the cleanup.
491 */
492 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
493 }
494
495 cvm_oct_kick_tx_poll_watchdog();
496
497 return NETDEV_TX_OK;
498 }
499
500 /**
501 * cvm_oct_xmit_pow - transmit a packet to the POW
502 * @skb: Packet to send
503 * @dev: Device info structure
504 * Returns Always returns zero
505 */
cvm_oct_xmit_pow(struct sk_buff * skb,struct net_device * dev)506 netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
507 {
508 struct octeon_ethernet *priv = netdev_priv(dev);
509 void *packet_buffer;
510 void *copy_location;
511
512 /* Get a work queue entry */
513 struct cvmx_wqe *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
514
515 if (unlikely(!work)) {
516 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
517 dev->name);
518 dev->stats.tx_dropped++;
519 dev_kfree_skb_any(skb);
520 return 0;
521 }
522
523 /* Get a packet buffer */
524 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
525 if (unlikely(!packet_buffer)) {
526 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
527 dev->name);
528 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
529 dev->stats.tx_dropped++;
530 dev_kfree_skb_any(skb);
531 return 0;
532 }
533
534 /*
535 * Calculate where we need to copy the data to. We need to
536 * leave 8 bytes for a next pointer (unused). We also need to
537 * include any configure skip. Then we need to align the IP
538 * packet src and dest into the same 64bit word. The below
539 * calculation may add a little extra, but that doesn't
540 * hurt.
541 */
542 copy_location = packet_buffer + sizeof(u64);
543 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
544
545 /*
546 * We have to copy the packet since whoever processes this
547 * packet will free it to a hardware pool. We can't use the
548 * trick of counting outstanding packets like in
549 * cvm_oct_xmit.
550 */
551 memcpy(copy_location, skb->data, skb->len);
552
553 /*
554 * Fill in some of the work queue fields. We may need to add
555 * more if the software at the other end needs them.
556 */
557 if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
558 work->word0.pip.cn38xx.hw_chksum = skb->csum;
559 work->word1.len = skb->len;
560 cvmx_wqe_set_port(work, priv->port);
561 cvmx_wqe_set_qos(work, priv->port & 0x7);
562 cvmx_wqe_set_grp(work, pow_send_group);
563 work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
564 work->word1.tag = pow_send_group; /* FIXME */
565 /* Default to zero. Sets of zero later are commented out */
566 work->word2.u64 = 0;
567 work->word2.s.bufs = 1;
568 work->packet_ptr.u64 = 0;
569 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
570 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
571 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
572 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
573
574 if (skb->protocol == htons(ETH_P_IP)) {
575 work->word2.s.ip_offset = 14;
576 work->word2.s.tcp_or_udp =
577 (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
578 (ip_hdr(skb)->protocol == IPPROTO_UDP);
579 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
580 (ip_hdr(skb)->frag_off ==
581 cpu_to_be16(1 << 14)));
582 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
583 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
584
585 /*
586 * When copying the data, include 4 bytes of the
587 * ethernet header to align the same way hardware
588 * does.
589 */
590 memcpy(work->packet_data, skb->data + 10,
591 sizeof(work->packet_data));
592 } else {
593 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
594 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
595 work->word2.snoip.is_bcast =
596 (skb->pkt_type == PACKET_BROADCAST);
597 work->word2.snoip.is_mcast =
598 (skb->pkt_type == PACKET_MULTICAST);
599 work->word2.snoip.not_IP = 1; /* IP was done up above */
600 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
601 }
602
603 /* Submit the packet to the POW */
604 cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
605 cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
606 dev->stats.tx_packets++;
607 dev->stats.tx_bytes += skb->len;
608 dev_consume_skb_any(skb);
609 return 0;
610 }
611
612 /**
613 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
614 * @dev: Device being shutdown
615 *
616 */
cvm_oct_tx_shutdown_dev(struct net_device * dev)617 void cvm_oct_tx_shutdown_dev(struct net_device *dev)
618 {
619 struct octeon_ethernet *priv = netdev_priv(dev);
620 unsigned long flags;
621 int qos;
622
623 for (qos = 0; qos < 16; qos++) {
624 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
625 while (skb_queue_len(&priv->tx_free_list[qos]))
626 dev_kfree_skb_any(__skb_dequeue
627 (&priv->tx_free_list[qos]));
628 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
629 }
630 }
631
cvm_oct_tx_do_cleanup(struct tasklet_struct * clean)632 static void cvm_oct_tx_do_cleanup(struct tasklet_struct *clean)
633 {
634 int port;
635
636 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
637 if (cvm_oct_device[port]) {
638 struct net_device *dev = cvm_oct_device[port];
639
640 cvm_oct_free_tx_skbs(dev);
641 }
642 }
643 }
644
cvm_oct_tx_cleanup_watchdog(int cpl,void * dev_id)645 static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
646 {
647 /* Disable the interrupt. */
648 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
649 /* Do the work in the tasklet. */
650 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
651 return IRQ_HANDLED;
652 }
653
cvm_oct_tx_initialize(void)654 void cvm_oct_tx_initialize(void)
655 {
656 int i;
657
658 /* Disable the interrupt. */
659 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
660 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
661 i = request_irq(OCTEON_IRQ_TIMER1,
662 cvm_oct_tx_cleanup_watchdog, 0,
663 "Ethernet", cvm_oct_device);
664
665 if (i)
666 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
667 }
668
cvm_oct_tx_shutdown(void)669 void cvm_oct_tx_shutdown(void)
670 {
671 /* Free the interrupt handler */
672 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
673 }
674