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(unsigned long arg);
44 static DECLARE_TASKLET_OLD(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_freed = 0;
77 int total_remaining = 0;
78 unsigned long flags;
79 struct octeon_ethernet *priv = netdev_priv(dev);
80
81 queues_per_port = cvmx_pko_get_num_queues(priv->port);
82 /* Drain any pending packets in the free list */
83 for (qos = 0; qos < queues_per_port; qos++) {
84 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
85 continue;
86 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
87 MAX_SKB_TO_FREE);
88 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
89 priv->fau + qos * 4);
90 total_freed += skb_to_free;
91 if (skb_to_free > 0) {
92 struct sk_buff *to_free_list = NULL;
93
94 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
95 while (skb_to_free > 0) {
96 struct sk_buff *t;
97
98 t = __skb_dequeue(&priv->tx_free_list[qos]);
99 t->next = to_free_list;
100 to_free_list = t;
101 skb_to_free--;
102 }
103 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
104 flags);
105 /* Do the actual freeing outside of the lock. */
106 while (to_free_list) {
107 struct sk_buff *t = to_free_list;
108
109 to_free_list = to_free_list->next;
110 dev_kfree_skb_any(t);
111 }
112 }
113 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
114 }
115 if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
116 netif_wake_queue(dev);
117 if (total_remaining)
118 cvm_oct_kick_tx_poll_watchdog();
119 }
120
121 /**
122 * cvm_oct_xmit - transmit a packet
123 * @skb: Packet to send
124 * @dev: Device info structure
125 *
126 * Returns Always returns NETDEV_TX_OK
127 */
cvm_oct_xmit(struct sk_buff * skb,struct net_device * dev)128 netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
129 {
130 union cvmx_pko_command_word0 pko_command;
131 union cvmx_buf_ptr hw_buffer;
132 u64 old_scratch;
133 u64 old_scratch2;
134 int qos;
135 int i;
136 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
137 struct octeon_ethernet *priv = netdev_priv(dev);
138 struct sk_buff *to_free_list;
139 int skb_to_free;
140 int buffers_to_free;
141 u32 total_to_clean;
142 unsigned long flags;
143 #if REUSE_SKBUFFS_WITHOUT_FREE
144 unsigned char *fpa_head;
145 #endif
146
147 /*
148 * Prefetch the private data structure. It is larger than the
149 * one cache line.
150 */
151 prefetch(priv);
152
153 /*
154 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
155 * completely remove "qos" in the event neither interface
156 * supports multiple queues per port.
157 */
158 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
159 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
160 qos = GET_SKBUFF_QOS(skb);
161 if (qos <= 0)
162 qos = 0;
163 else if (qos >= cvmx_pko_get_num_queues(priv->port))
164 qos = 0;
165 } else {
166 qos = 0;
167 }
168
169 if (USE_ASYNC_IOBDMA) {
170 /* Save scratch in case userspace is using it */
171 CVMX_SYNCIOBDMA;
172 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
173 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
174
175 /*
176 * Fetch and increment the number of packets to be
177 * freed.
178 */
179 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
180 FAU_NUM_PACKET_BUFFERS_TO_FREE,
181 0);
182 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
183 priv->fau + qos * 4,
184 MAX_SKB_TO_FREE);
185 }
186
187 /*
188 * We have space for 6 segment pointers, If there will be more
189 * than that, we must linearize.
190 */
191 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
192 if (unlikely(__skb_linearize(skb))) {
193 queue_type = QUEUE_DROP;
194 if (USE_ASYNC_IOBDMA) {
195 /*
196 * Get the number of skbuffs in use
197 * by the hardware
198 */
199 CVMX_SYNCIOBDMA;
200 skb_to_free =
201 cvmx_scratch_read64(CVMX_SCR_SCRATCH);
202 } else {
203 /*
204 * Get the number of skbuffs in use
205 * by the hardware
206 */
207 skb_to_free =
208 cvmx_fau_fetch_and_add32(priv->fau +
209 qos * 4,
210 MAX_SKB_TO_FREE);
211 }
212 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
213 priv->fau +
214 qos * 4);
215 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
216 goto skip_xmit;
217 }
218 }
219
220 /*
221 * The CN3XXX series of parts has an errata (GMX-401) which
222 * causes the GMX block to hang if a collision occurs towards
223 * the end of a <68 byte packet. As a workaround for this, we
224 * pad packets to be 68 bytes whenever we are in half duplex
225 * mode. We don't handle the case of having a small packet but
226 * no room to add the padding. The kernel should always give
227 * us at least a cache line
228 */
229 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
230 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
231 int interface = INTERFACE(priv->port);
232 int index = INDEX(priv->port);
233
234 if (interface < 2) {
235 /* We only need to pad packet in half duplex mode */
236 gmx_prt_cfg.u64 =
237 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
238 if (gmx_prt_cfg.s.duplex == 0) {
239 int add_bytes = 64 - skb->len;
240
241 if ((skb_tail_pointer(skb) + add_bytes) <=
242 skb_end_pointer(skb))
243 __skb_put_zero(skb, add_bytes);
244 }
245 }
246 }
247
248 /* Build the PKO command */
249 pko_command.u64 = 0;
250 #ifdef __LITTLE_ENDIAN
251 pko_command.s.le = 1;
252 #endif
253 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
254 pko_command.s.segs = 1;
255 pko_command.s.total_bytes = skb->len;
256 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
257 pko_command.s.subone0 = 1;
258
259 pko_command.s.dontfree = 1;
260
261 /* Build the PKO buffer pointer */
262 hw_buffer.u64 = 0;
263 if (skb_shinfo(skb)->nr_frags == 0) {
264 hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
265 hw_buffer.s.pool = 0;
266 hw_buffer.s.size = skb->len;
267 } else {
268 hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
269 hw_buffer.s.pool = 0;
270 hw_buffer.s.size = skb_headlen(skb);
271 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
272 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
273 skb_frag_t *fs = skb_shinfo(skb)->frags + i;
274
275 hw_buffer.s.addr =
276 XKPHYS_TO_PHYS((uintptr_t)skb_frag_address(fs));
277 hw_buffer.s.size = skb_frag_size(fs);
278 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
279 }
280 hw_buffer.s.addr =
281 XKPHYS_TO_PHYS((uintptr_t)CVM_OCT_SKB_CB(skb));
282 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
283 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
284 pko_command.s.gather = 1;
285 goto dont_put_skbuff_in_hw;
286 }
287
288 /*
289 * See if we can put this skb in the FPA pool. Any strange
290 * behavior from the Linux networking stack will most likely
291 * be caused by a bug in the following code. If some field is
292 * in use by the network stack and gets carried over when a
293 * buffer is reused, bad things may happen. If in doubt and
294 * you dont need the absolute best performance, disable the
295 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
296 * shown a 25% increase in performance under some loads.
297 */
298 #if REUSE_SKBUFFS_WITHOUT_FREE
299 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
300 if (unlikely(skb->data < fpa_head)) {
301 /* TX buffer beginning can't meet FPA alignment constraints */
302 goto dont_put_skbuff_in_hw;
303 }
304 if (unlikely
305 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
306 /* TX buffer isn't large enough for the FPA */
307 goto dont_put_skbuff_in_hw;
308 }
309 if (unlikely(skb_shared(skb))) {
310 /* TX buffer sharing data with someone else */
311 goto dont_put_skbuff_in_hw;
312 }
313 if (unlikely(skb_cloned(skb))) {
314 /* TX buffer has been cloned */
315 goto dont_put_skbuff_in_hw;
316 }
317 if (unlikely(skb_header_cloned(skb))) {
318 /* TX buffer header has been cloned */
319 goto dont_put_skbuff_in_hw;
320 }
321 if (unlikely(skb->destructor)) {
322 /* TX buffer has a destructor */
323 goto dont_put_skbuff_in_hw;
324 }
325 if (unlikely(skb_shinfo(skb)->nr_frags)) {
326 /* TX buffer has fragments */
327 goto dont_put_skbuff_in_hw;
328 }
329 if (unlikely
330 (skb->truesize !=
331 sizeof(*skb) + skb_end_offset(skb))) {
332 /* TX buffer truesize has been changed */
333 goto dont_put_skbuff_in_hw;
334 }
335
336 /*
337 * We can use this buffer in the FPA. We don't need the FAU
338 * update anymore
339 */
340 pko_command.s.dontfree = 0;
341
342 hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
343 ((unsigned long)fpa_head >> 7);
344
345 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
346
347 /*
348 * The skbuff will be reused without ever being freed. We must
349 * cleanup a bunch of core things.
350 */
351 dst_release(skb_dst(skb));
352 skb_dst_set(skb, NULL);
353 skb_ext_reset(skb);
354 nf_reset_ct(skb);
355 skb_reset_redirect(skb);
356
357 #ifdef CONFIG_NET_SCHED
358 skb->tc_index = 0;
359 #endif /* CONFIG_NET_SCHED */
360 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
361
362 dont_put_skbuff_in_hw:
363
364 /* Check if we can use the hardware checksumming */
365 if ((skb->protocol == htons(ETH_P_IP)) &&
366 (ip_hdr(skb)->version == 4) &&
367 (ip_hdr(skb)->ihl == 5) &&
368 ((ip_hdr(skb)->frag_off == 0) ||
369 (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
370 ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
371 (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
372 /* Use hardware checksum calc */
373 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
374 }
375
376 if (USE_ASYNC_IOBDMA) {
377 /* Get the number of skbuffs in use by the hardware */
378 CVMX_SYNCIOBDMA;
379 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
380 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
381 } else {
382 /* Get the number of skbuffs in use by the hardware */
383 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
384 MAX_SKB_TO_FREE);
385 buffers_to_free =
386 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
387 }
388
389 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
390 priv->fau + qos * 4);
391
392 /*
393 * If we're sending faster than the receive can free them then
394 * don't do the HW free.
395 */
396 if ((buffers_to_free < -100) && !pko_command.s.dontfree)
397 pko_command.s.dontfree = 1;
398
399 if (pko_command.s.dontfree) {
400 queue_type = QUEUE_CORE;
401 pko_command.s.reg0 = priv->fau + qos * 4;
402 } else {
403 queue_type = QUEUE_HW;
404 }
405 if (USE_ASYNC_IOBDMA)
406 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
407 FAU_TOTAL_TX_TO_CLEAN, 1);
408
409 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
410
411 /* Drop this packet if we have too many already queued to the HW */
412 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
413 MAX_OUT_QUEUE_DEPTH)) {
414 if (dev->tx_queue_len != 0) {
415 /* Drop the lock when notifying the core. */
416 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
417 flags);
418 netif_stop_queue(dev);
419 spin_lock_irqsave(&priv->tx_free_list[qos].lock,
420 flags);
421 } else {
422 /* If not using normal queueing. */
423 queue_type = QUEUE_DROP;
424 goto skip_xmit;
425 }
426 }
427
428 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
429 CVMX_PKO_LOCK_NONE);
430
431 /* Send the packet to the output queue */
432 if (unlikely(cvmx_pko_send_packet_finish(priv->port,
433 priv->queue + qos,
434 pko_command, hw_buffer,
435 CVMX_PKO_LOCK_NONE))) {
436 printk_ratelimited("%s: Failed to send the packet\n",
437 dev->name);
438 queue_type = QUEUE_DROP;
439 }
440 skip_xmit:
441 to_free_list = NULL;
442
443 switch (queue_type) {
444 case QUEUE_DROP:
445 skb->next = to_free_list;
446 to_free_list = skb;
447 dev->stats.tx_dropped++;
448 break;
449 case QUEUE_HW:
450 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
451 break;
452 case QUEUE_CORE:
453 __skb_queue_tail(&priv->tx_free_list[qos], skb);
454 break;
455 default:
456 BUG();
457 }
458
459 while (skb_to_free > 0) {
460 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
461
462 t->next = to_free_list;
463 to_free_list = t;
464 skb_to_free--;
465 }
466
467 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
468
469 /* Do the actual freeing outside of the lock. */
470 while (to_free_list) {
471 struct sk_buff *t = to_free_list;
472
473 to_free_list = to_free_list->next;
474 dev_kfree_skb_any(t);
475 }
476
477 if (USE_ASYNC_IOBDMA) {
478 CVMX_SYNCIOBDMA;
479 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
480 /* Restore the scratch area */
481 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
482 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
483 } else {
484 total_to_clean =
485 cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
486 }
487
488 if (total_to_clean & 0x3ff) {
489 /*
490 * Schedule the cleanup tasklet every 1024 packets for
491 * the pathological case of high traffic on one port
492 * delaying clean up of packets on a different port
493 * that is blocked waiting for the cleanup.
494 */
495 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
496 }
497
498 cvm_oct_kick_tx_poll_watchdog();
499
500 return NETDEV_TX_OK;
501 }
502
503 /**
504 * cvm_oct_xmit_pow - transmit a packet to the POW
505 * @skb: Packet to send
506 * @dev: Device info structure
507 * Returns Always returns zero
508 */
cvm_oct_xmit_pow(struct sk_buff * skb,struct net_device * dev)509 netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
510 {
511 struct octeon_ethernet *priv = netdev_priv(dev);
512 void *packet_buffer;
513 void *copy_location;
514
515 /* Get a work queue entry */
516 struct cvmx_wqe *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
517
518 if (unlikely(!work)) {
519 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
520 dev->name);
521 dev->stats.tx_dropped++;
522 dev_kfree_skb_any(skb);
523 return 0;
524 }
525
526 /* Get a packet buffer */
527 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
528 if (unlikely(!packet_buffer)) {
529 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
530 dev->name);
531 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
532 dev->stats.tx_dropped++;
533 dev_kfree_skb_any(skb);
534 return 0;
535 }
536
537 /*
538 * Calculate where we need to copy the data to. We need to
539 * leave 8 bytes for a next pointer (unused). We also need to
540 * include any configure skip. Then we need to align the IP
541 * packet src and dest into the same 64bit word. The below
542 * calculation may add a little extra, but that doesn't
543 * hurt.
544 */
545 copy_location = packet_buffer + sizeof(u64);
546 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
547
548 /*
549 * We have to copy the packet since whoever processes this
550 * packet will free it to a hardware pool. We can't use the
551 * trick of counting outstanding packets like in
552 * cvm_oct_xmit.
553 */
554 memcpy(copy_location, skb->data, skb->len);
555
556 /*
557 * Fill in some of the work queue fields. We may need to add
558 * more if the software at the other end needs them.
559 */
560 if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
561 work->word0.pip.cn38xx.hw_chksum = skb->csum;
562 work->word1.len = skb->len;
563 cvmx_wqe_set_port(work, priv->port);
564 cvmx_wqe_set_qos(work, priv->port & 0x7);
565 cvmx_wqe_set_grp(work, pow_send_group);
566 work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
567 work->word1.tag = pow_send_group; /* FIXME */
568 /* Default to zero. Sets of zero later are commented out */
569 work->word2.u64 = 0;
570 work->word2.s.bufs = 1;
571 work->packet_ptr.u64 = 0;
572 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
573 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
574 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
575 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
576
577 if (skb->protocol == htons(ETH_P_IP)) {
578 work->word2.s.ip_offset = 14;
579 #if 0
580 work->word2.s.vlan_valid = 0; /* FIXME */
581 work->word2.s.vlan_cfi = 0; /* FIXME */
582 work->word2.s.vlan_id = 0; /* FIXME */
583 work->word2.s.dec_ipcomp = 0; /* FIXME */
584 #endif
585 work->word2.s.tcp_or_udp =
586 (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
587 (ip_hdr(skb)->protocol == IPPROTO_UDP);
588 #if 0
589 /* FIXME */
590 work->word2.s.dec_ipsec = 0;
591 /* We only support IPv4 right now */
592 work->word2.s.is_v6 = 0;
593 /* Hardware would set to zero */
594 work->word2.s.software = 0;
595 /* No error, packet is internal */
596 work->word2.s.L4_error = 0;
597 #endif
598 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
599 (ip_hdr(skb)->frag_off ==
600 cpu_to_be16(1 << 14)));
601 #if 0
602 /* Assume Linux is sending a good packet */
603 work->word2.s.IP_exc = 0;
604 #endif
605 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
606 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
607 #if 0
608 /* This is an IP packet */
609 work->word2.s.not_IP = 0;
610 /* No error, packet is internal */
611 work->word2.s.rcv_error = 0;
612 /* No error, packet is internal */
613 work->word2.s.err_code = 0;
614 #endif
615
616 /*
617 * When copying the data, include 4 bytes of the
618 * ethernet header to align the same way hardware
619 * does.
620 */
621 memcpy(work->packet_data, skb->data + 10,
622 sizeof(work->packet_data));
623 } else {
624 #if 0
625 work->word2.snoip.vlan_valid = 0; /* FIXME */
626 work->word2.snoip.vlan_cfi = 0; /* FIXME */
627 work->word2.snoip.vlan_id = 0; /* FIXME */
628 work->word2.snoip.software = 0; /* Hardware would set to zero */
629 #endif
630 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
631 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
632 work->word2.snoip.is_bcast =
633 (skb->pkt_type == PACKET_BROADCAST);
634 work->word2.snoip.is_mcast =
635 (skb->pkt_type == PACKET_MULTICAST);
636 work->word2.snoip.not_IP = 1; /* IP was done up above */
637 #if 0
638 /* No error, packet is internal */
639 work->word2.snoip.rcv_error = 0;
640 /* No error, packet is internal */
641 work->word2.snoip.err_code = 0;
642 #endif
643 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
644 }
645
646 /* Submit the packet to the POW */
647 cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
648 cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
649 dev->stats.tx_packets++;
650 dev->stats.tx_bytes += skb->len;
651 dev_consume_skb_any(skb);
652 return 0;
653 }
654
655 /**
656 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
657 * @dev: Device being shutdown
658 *
659 */
cvm_oct_tx_shutdown_dev(struct net_device * dev)660 void cvm_oct_tx_shutdown_dev(struct net_device *dev)
661 {
662 struct octeon_ethernet *priv = netdev_priv(dev);
663 unsigned long flags;
664 int qos;
665
666 for (qos = 0; qos < 16; qos++) {
667 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
668 while (skb_queue_len(&priv->tx_free_list[qos]))
669 dev_kfree_skb_any(__skb_dequeue
670 (&priv->tx_free_list[qos]));
671 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
672 }
673 }
674
cvm_oct_tx_do_cleanup(unsigned long arg)675 static void cvm_oct_tx_do_cleanup(unsigned long arg)
676 {
677 int port;
678
679 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
680 if (cvm_oct_device[port]) {
681 struct net_device *dev = cvm_oct_device[port];
682
683 cvm_oct_free_tx_skbs(dev);
684 }
685 }
686 }
687
cvm_oct_tx_cleanup_watchdog(int cpl,void * dev_id)688 static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
689 {
690 /* Disable the interrupt. */
691 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
692 /* Do the work in the tasklet. */
693 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
694 return IRQ_HANDLED;
695 }
696
cvm_oct_tx_initialize(void)697 void cvm_oct_tx_initialize(void)
698 {
699 int i;
700
701 /* Disable the interrupt. */
702 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
703 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
704 i = request_irq(OCTEON_IRQ_TIMER1,
705 cvm_oct_tx_cleanup_watchdog, 0,
706 "Ethernet", cvm_oct_device);
707
708 if (i)
709 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
710 }
711
cvm_oct_tx_shutdown(void)712 void cvm_oct_tx_shutdown(void)
713 {
714 /* Free the interrupt handler */
715 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
716 }
717