1 /*********************************************************************
2 * Author: Cavium Networks
3 *
4 * Contact: support@caviumnetworks.com
5 * This file is part of the OCTEON SDK
6 *
7 * Copyright (c) 2003-2010 Cavium Networks
8 *
9 * This file is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License, Version 2, as
11 * published by the Free Software Foundation.
12 *
13 * This file is distributed in the hope that it will be useful, but
14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
16 * NONINFRINGEMENT. See the GNU General Public License for more
17 * details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this file; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 * or visit http://www.gnu.org/licenses/.
23 *
24 * This file may also be available under a different license from Cavium.
25 * Contact Cavium Networks for more information
26 *********************************************************************/
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/netdevice.h>
30 #include <linux/etherdevice.h>
31 #include <linux/ip.h>
32 #include <linux/ratelimit.h>
33 #include <linux/string.h>
34 #include <linux/interrupt.h>
35 #include <net/dst.h>
36 #ifdef CONFIG_XFRM
37 #include <linux/xfrm.h>
38 #include <net/xfrm.h>
39 #endif /* CONFIG_XFRM */
40
41 #include <linux/atomic.h>
42
43 #include <asm/octeon/octeon.h>
44
45 #include "ethernet-defines.h"
46 #include "octeon-ethernet.h"
47 #include "ethernet-tx.h"
48 #include "ethernet-util.h"
49
50 #include <asm/octeon/cvmx-wqe.h>
51 #include <asm/octeon/cvmx-fau.h>
52 #include <asm/octeon/cvmx-pip.h>
53 #include <asm/octeon/cvmx-pko.h>
54 #include <asm/octeon/cvmx-helper.h>
55
56 #include <asm/octeon/cvmx-gmxx-defs.h>
57
58 #define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))
59
60 /*
61 * You can define GET_SKBUFF_QOS() to override how the skbuff output
62 * function determines which output queue is used. The default
63 * implementation always uses the base queue for the port. If, for
64 * example, you wanted to use the skb->priority field, define
65 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
66 */
67 #ifndef GET_SKBUFF_QOS
68 #define GET_SKBUFF_QOS(skb) 0
69 #endif
70
71 static void cvm_oct_tx_do_cleanup(unsigned long arg);
72 static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
73
74 /* Maximum number of SKBs to try to free per xmit packet. */
75 #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
76
cvm_oct_adjust_skb_to_free(int32_t skb_to_free,int fau)77 static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau)
78 {
79 int32_t undo;
80
81 undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
82 MAX_SKB_TO_FREE;
83 if (undo > 0)
84 cvmx_fau_atomic_add32(fau, -undo);
85 skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
86 -skb_to_free;
87 return skb_to_free;
88 }
89
cvm_oct_kick_tx_poll_watchdog(void)90 static void cvm_oct_kick_tx_poll_watchdog(void)
91 {
92 union cvmx_ciu_timx ciu_timx;
93
94 ciu_timx.u64 = 0;
95 ciu_timx.s.one_shot = 1;
96 ciu_timx.s.len = cvm_oct_tx_poll_interval;
97 cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
98 }
99
cvm_oct_free_tx_skbs(struct net_device * dev)100 static void cvm_oct_free_tx_skbs(struct net_device *dev)
101 {
102 int32_t skb_to_free;
103 int qos, queues_per_port;
104 int total_freed = 0;
105 int total_remaining = 0;
106 unsigned long flags;
107 struct octeon_ethernet *priv = netdev_priv(dev);
108
109 queues_per_port = cvmx_pko_get_num_queues(priv->port);
110 /* Drain any pending packets in the free list */
111 for (qos = 0; qos < queues_per_port; qos++) {
112 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
113 continue;
114 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4,
115 MAX_SKB_TO_FREE);
116 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
117 priv->fau+qos*4);
118
119
120 total_freed += skb_to_free;
121 if (skb_to_free > 0) {
122 struct sk_buff *to_free_list = NULL;
123
124 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
125 while (skb_to_free > 0) {
126 struct sk_buff *t;
127
128 t = __skb_dequeue(&priv->tx_free_list[qos]);
129 t->next = to_free_list;
130 to_free_list = t;
131 skb_to_free--;
132 }
133 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
134 flags);
135 /* Do the actual freeing outside of the lock. */
136 while (to_free_list) {
137 struct sk_buff *t = to_free_list;
138
139 to_free_list = to_free_list->next;
140 dev_kfree_skb_any(t);
141 }
142 }
143 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
144 }
145 if (total_freed >= 0 && netif_queue_stopped(dev))
146 netif_wake_queue(dev);
147 if (total_remaining)
148 cvm_oct_kick_tx_poll_watchdog();
149 }
150
151 /**
152 * cvm_oct_xmit - transmit a packet
153 * @skb: Packet to send
154 * @dev: Device info structure
155 *
156 * Returns Always returns NETDEV_TX_OK
157 */
cvm_oct_xmit(struct sk_buff * skb,struct net_device * dev)158 int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
159 {
160 cvmx_pko_command_word0_t pko_command;
161 union cvmx_buf_ptr hw_buffer;
162 uint64_t old_scratch;
163 uint64_t old_scratch2;
164 int qos;
165 int i;
166 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
167 struct octeon_ethernet *priv = netdev_priv(dev);
168 struct sk_buff *to_free_list;
169 int32_t skb_to_free;
170 int32_t buffers_to_free;
171 u32 total_to_clean;
172 unsigned long flags;
173 #if REUSE_SKBUFFS_WITHOUT_FREE
174 unsigned char *fpa_head;
175 #endif
176
177 /*
178 * Prefetch the private data structure. It is larger than the
179 * one cache line.
180 */
181 prefetch(priv);
182
183 /*
184 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
185 * completely remove "qos" in the event neither interface
186 * supports multiple queues per port.
187 */
188 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
189 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
190 qos = GET_SKBUFF_QOS(skb);
191 if (qos <= 0)
192 qos = 0;
193 else if (qos >= cvmx_pko_get_num_queues(priv->port))
194 qos = 0;
195 } else
196 qos = 0;
197
198 if (USE_ASYNC_IOBDMA) {
199 /* Save scratch in case userspace is using it */
200 CVMX_SYNCIOBDMA;
201 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
202 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
203
204 /*
205 * Fetch and increment the number of packets to be
206 * freed.
207 */
208 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
209 FAU_NUM_PACKET_BUFFERS_TO_FREE,
210 0);
211 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
212 priv->fau + qos * 4,
213 MAX_SKB_TO_FREE);
214 }
215
216 /*
217 * We have space for 6 segment pointers, If there will be more
218 * than that, we must linearize.
219 */
220 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
221 if (unlikely(__skb_linearize(skb))) {
222 queue_type = QUEUE_DROP;
223 if (USE_ASYNC_IOBDMA) {
224 /*
225 * Get the number of skbuffs in use
226 * by the hardware
227 */
228 CVMX_SYNCIOBDMA;
229 skb_to_free =
230 cvmx_scratch_read64(CVMX_SCR_SCRATCH);
231 } else {
232 /*
233 * Get the number of skbuffs in use
234 * by the hardware
235 */
236 skb_to_free = cvmx_fau_fetch_and_add32(
237 priv->fau + qos * 4, MAX_SKB_TO_FREE);
238 }
239 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
240 priv->fau + qos * 4);
241 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
242 goto skip_xmit;
243 }
244 }
245
246 /*
247 * The CN3XXX series of parts has an errata (GMX-401) which
248 * causes the GMX block to hang if a collision occurs towards
249 * the end of a <68 byte packet. As a workaround for this, we
250 * pad packets to be 68 bytes whenever we are in half duplex
251 * mode. We don't handle the case of having a small packet but
252 * no room to add the padding. The kernel should always give
253 * us at least a cache line
254 */
255 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
256 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
257 int interface = INTERFACE(priv->port);
258 int index = INDEX(priv->port);
259
260 if (interface < 2) {
261 /* We only need to pad packet in half duplex mode */
262 gmx_prt_cfg.u64 =
263 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
264 if (gmx_prt_cfg.s.duplex == 0) {
265 int add_bytes = 64 - skb->len;
266
267 if ((skb_tail_pointer(skb) + add_bytes) <=
268 skb_end_pointer(skb))
269 memset(__skb_put(skb, add_bytes), 0,
270 add_bytes);
271 }
272 }
273 }
274
275 /* Build the PKO command */
276 pko_command.u64 = 0;
277 #ifdef __LITTLE_ENDIAN
278 pko_command.s.le = 1;
279 #endif
280 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
281 pko_command.s.segs = 1;
282 pko_command.s.total_bytes = skb->len;
283 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
284 pko_command.s.subone0 = 1;
285
286 pko_command.s.dontfree = 1;
287
288 /* Build the PKO buffer pointer */
289 hw_buffer.u64 = 0;
290 if (skb_shinfo(skb)->nr_frags == 0) {
291 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
292 hw_buffer.s.pool = 0;
293 hw_buffer.s.size = skb->len;
294 } else {
295 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
296 hw_buffer.s.pool = 0;
297 hw_buffer.s.size = skb_headlen(skb);
298 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
299 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
300 struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i;
301
302 hw_buffer.s.addr = XKPHYS_TO_PHYS(
303 (u64)(page_address(fs->page.p) +
304 fs->page_offset));
305 hw_buffer.s.size = fs->size;
306 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
307 }
308 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
309 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
310 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
311 pko_command.s.gather = 1;
312 goto dont_put_skbuff_in_hw;
313 }
314
315 /*
316 * See if we can put this skb in the FPA pool. Any strange
317 * behavior from the Linux networking stack will most likely
318 * be caused by a bug in the following code. If some field is
319 * in use by the network stack and gets carried over when a
320 * buffer is reused, bad things may happen. If in doubt and
321 * you dont need the absolute best performance, disable the
322 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
323 * shown a 25% increase in performance under some loads.
324 */
325 #if REUSE_SKBUFFS_WITHOUT_FREE
326 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
327 if (unlikely(skb->data < fpa_head)) {
328 /*
329 * printk("TX buffer beginning can't meet FPA
330 * alignment constraints\n");
331 */
332 goto dont_put_skbuff_in_hw;
333 }
334 if (unlikely
335 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
336 /*
337 printk("TX buffer isn't large enough for the FPA\n");
338 */
339 goto dont_put_skbuff_in_hw;
340 }
341 if (unlikely(skb_shared(skb))) {
342 /*
343 printk("TX buffer sharing data with someone else\n");
344 */
345 goto dont_put_skbuff_in_hw;
346 }
347 if (unlikely(skb_cloned(skb))) {
348 /*
349 printk("TX buffer has been cloned\n");
350 */
351 goto dont_put_skbuff_in_hw;
352 }
353 if (unlikely(skb_header_cloned(skb))) {
354 /*
355 printk("TX buffer header has been cloned\n");
356 */
357 goto dont_put_skbuff_in_hw;
358 }
359 if (unlikely(skb->destructor)) {
360 /*
361 printk("TX buffer has a destructor\n");
362 */
363 goto dont_put_skbuff_in_hw;
364 }
365 if (unlikely(skb_shinfo(skb)->nr_frags)) {
366 /*
367 printk("TX buffer has fragments\n");
368 */
369 goto dont_put_skbuff_in_hw;
370 }
371 if (unlikely
372 (skb->truesize !=
373 sizeof(*skb) + skb_end_offset(skb))) {
374 /*
375 printk("TX buffer truesize has been changed\n");
376 */
377 goto dont_put_skbuff_in_hw;
378 }
379
380 /*
381 * We can use this buffer in the FPA. We don't need the FAU
382 * update anymore
383 */
384 pko_command.s.dontfree = 0;
385
386 hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
387 ((unsigned long)fpa_head >> 7);
388
389 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
390
391 /*
392 * The skbuff will be reused without ever being freed. We must
393 * cleanup a bunch of core things.
394 */
395 dst_release(skb_dst(skb));
396 skb_dst_set(skb, NULL);
397 #ifdef CONFIG_XFRM
398 secpath_put(skb->sp);
399 skb->sp = NULL;
400 #endif
401 nf_reset(skb);
402
403 #ifdef CONFIG_NET_SCHED
404 skb->tc_index = 0;
405 #ifdef CONFIG_NET_CLS_ACT
406 skb->tc_verd = 0;
407 #endif /* CONFIG_NET_CLS_ACT */
408 #endif /* CONFIG_NET_SCHED */
409 #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
410
411 dont_put_skbuff_in_hw:
412
413 /* Check if we can use the hardware checksumming */
414 if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) &&
415 (ip_hdr(skb)->version == 4) && (ip_hdr(skb)->ihl == 5) &&
416 ((ip_hdr(skb)->frag_off == 0) || (ip_hdr(skb)->frag_off == htons(1 << 14)))
417 && ((ip_hdr(skb)->protocol == IPPROTO_TCP)
418 || (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
419 /* Use hardware checksum calc */
420 pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1;
421 }
422
423 if (USE_ASYNC_IOBDMA) {
424 /* Get the number of skbuffs in use by the hardware */
425 CVMX_SYNCIOBDMA;
426 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
427 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
428 } else {
429 /* Get the number of skbuffs in use by the hardware */
430 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
431 MAX_SKB_TO_FREE);
432 buffers_to_free =
433 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
434 }
435
436 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
437
438 /*
439 * If we're sending faster than the receive can free them then
440 * don't do the HW free.
441 */
442 if ((buffers_to_free < -100) && !pko_command.s.dontfree)
443 pko_command.s.dontfree = 1;
444
445 if (pko_command.s.dontfree) {
446 queue_type = QUEUE_CORE;
447 pko_command.s.reg0 = priv->fau+qos*4;
448 } else {
449 queue_type = QUEUE_HW;
450 }
451 if (USE_ASYNC_IOBDMA)
452 cvmx_fau_async_fetch_and_add32(
453 CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
454
455 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
456
457 /* Drop this packet if we have too many already queued to the HW */
458 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
459 MAX_OUT_QUEUE_DEPTH)) {
460
461 if (dev->tx_queue_len != 0) {
462 /* Drop the lock when notifying the core. */
463 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
464 flags);
465 netif_stop_queue(dev);
466 spin_lock_irqsave(&priv->tx_free_list[qos].lock,
467 flags);
468 } else {
469 /* If not using normal queueing. */
470 queue_type = QUEUE_DROP;
471 goto skip_xmit;
472 }
473 }
474
475 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
476 CVMX_PKO_LOCK_NONE);
477
478 /* Send the packet to the output queue */
479 if (unlikely(cvmx_pko_send_packet_finish(priv->port,
480 priv->queue + qos,
481 pko_command, hw_buffer,
482 CVMX_PKO_LOCK_NONE))) {
483 printk_ratelimited("%s: Failed to send the packet\n",
484 dev->name);
485 queue_type = QUEUE_DROP;
486 }
487 skip_xmit:
488 to_free_list = NULL;
489
490 switch (queue_type) {
491 case QUEUE_DROP:
492 skb->next = to_free_list;
493 to_free_list = skb;
494 priv->stats.tx_dropped++;
495 break;
496 case QUEUE_HW:
497 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
498 break;
499 case QUEUE_CORE:
500 __skb_queue_tail(&priv->tx_free_list[qos], skb);
501 break;
502 default:
503 BUG();
504 }
505
506 while (skb_to_free > 0) {
507 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
508
509 t->next = to_free_list;
510 to_free_list = t;
511 skb_to_free--;
512 }
513
514 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
515
516 /* Do the actual freeing outside of the lock. */
517 while (to_free_list) {
518 struct sk_buff *t = to_free_list;
519
520 to_free_list = to_free_list->next;
521 dev_kfree_skb_any(t);
522 }
523
524 if (USE_ASYNC_IOBDMA) {
525 CVMX_SYNCIOBDMA;
526 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
527 /* Restore the scratch area */
528 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
529 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
530 } else {
531 total_to_clean = cvmx_fau_fetch_and_add32(
532 FAU_TOTAL_TX_TO_CLEAN, 1);
533 }
534
535 if (total_to_clean & 0x3ff) {
536 /*
537 * Schedule the cleanup tasklet every 1024 packets for
538 * the pathological case of high traffic on one port
539 * delaying clean up of packets on a different port
540 * that is blocked waiting for the cleanup.
541 */
542 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
543 }
544
545 cvm_oct_kick_tx_poll_watchdog();
546
547 return NETDEV_TX_OK;
548 }
549
550 /**
551 * cvm_oct_xmit_pow - transmit a packet to the POW
552 * @skb: Packet to send
553 * @dev: Device info structure
554
555 * Returns Always returns zero
556 */
cvm_oct_xmit_pow(struct sk_buff * skb,struct net_device * dev)557 int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
558 {
559 struct octeon_ethernet *priv = netdev_priv(dev);
560 void *packet_buffer;
561 void *copy_location;
562
563 /* Get a work queue entry */
564 cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
565
566 if (unlikely(work == NULL)) {
567 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
568 dev->name);
569 priv->stats.tx_dropped++;
570 dev_kfree_skb_any(skb);
571 return 0;
572 }
573
574 /* Get a packet buffer */
575 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
576 if (unlikely(packet_buffer == NULL)) {
577 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
578 dev->name);
579 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1));
580 priv->stats.tx_dropped++;
581 dev_kfree_skb_any(skb);
582 return 0;
583 }
584
585 /*
586 * Calculate where we need to copy the data to. We need to
587 * leave 8 bytes for a next pointer (unused). We also need to
588 * include any configure skip. Then we need to align the IP
589 * packet src and dest into the same 64bit word. The below
590 * calculation may add a little extra, but that doesn't
591 * hurt.
592 */
593 copy_location = packet_buffer + sizeof(uint64_t);
594 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
595
596 /*
597 * We have to copy the packet since whoever processes this
598 * packet will free it to a hardware pool. We can't use the
599 * trick of counting outstanding packets like in
600 * cvm_oct_xmit.
601 */
602 memcpy(copy_location, skb->data, skb->len);
603
604 /*
605 * Fill in some of the work queue fields. We may need to add
606 * more if the software at the other end needs them.
607 */
608 work->hw_chksum = skb->csum;
609 work->len = skb->len;
610 work->ipprt = priv->port;
611 work->qos = priv->port & 0x7;
612 work->grp = pow_send_group;
613 work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
614 work->tag = pow_send_group; /* FIXME */
615 /* Default to zero. Sets of zero later are commented out */
616 work->word2.u64 = 0;
617 work->word2.s.bufs = 1;
618 work->packet_ptr.u64 = 0;
619 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
620 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
621 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
622 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
623
624 if (skb->protocol == htons(ETH_P_IP)) {
625 work->word2.s.ip_offset = 14;
626 #if 0
627 work->word2.s.vlan_valid = 0; /* FIXME */
628 work->word2.s.vlan_cfi = 0; /* FIXME */
629 work->word2.s.vlan_id = 0; /* FIXME */
630 work->word2.s.dec_ipcomp = 0; /* FIXME */
631 #endif
632 work->word2.s.tcp_or_udp =
633 (ip_hdr(skb)->protocol == IPPROTO_TCP)
634 || (ip_hdr(skb)->protocol == IPPROTO_UDP);
635 #if 0
636 /* FIXME */
637 work->word2.s.dec_ipsec = 0;
638 /* We only support IPv4 right now */
639 work->word2.s.is_v6 = 0;
640 /* Hardware would set to zero */
641 work->word2.s.software = 0;
642 /* No error, packet is internal */
643 work->word2.s.L4_error = 0;
644 #endif
645 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0)
646 || (ip_hdr(skb)->frag_off ==
647 1 << 14));
648 #if 0
649 /* Assume Linux is sending a good packet */
650 work->word2.s.IP_exc = 0;
651 #endif
652 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
653 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
654 #if 0
655 /* This is an IP packet */
656 work->word2.s.not_IP = 0;
657 /* No error, packet is internal */
658 work->word2.s.rcv_error = 0;
659 /* No error, packet is internal */
660 work->word2.s.err_code = 0;
661 #endif
662
663 /*
664 * When copying the data, include 4 bytes of the
665 * ethernet header to align the same way hardware
666 * does.
667 */
668 memcpy(work->packet_data, skb->data + 10,
669 sizeof(work->packet_data));
670 } else {
671 #if 0
672 work->word2.snoip.vlan_valid = 0; /* FIXME */
673 work->word2.snoip.vlan_cfi = 0; /* FIXME */
674 work->word2.snoip.vlan_id = 0; /* FIXME */
675 work->word2.snoip.software = 0; /* Hardware would set to zero */
676 #endif
677 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
678 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
679 work->word2.snoip.is_bcast =
680 (skb->pkt_type == PACKET_BROADCAST);
681 work->word2.snoip.is_mcast =
682 (skb->pkt_type == PACKET_MULTICAST);
683 work->word2.snoip.not_IP = 1; /* IP was done up above */
684 #if 0
685 /* No error, packet is internal */
686 work->word2.snoip.rcv_error = 0;
687 /* No error, packet is internal */
688 work->word2.snoip.err_code = 0;
689 #endif
690 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
691 }
692
693 /* Submit the packet to the POW */
694 cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos,
695 work->grp);
696 priv->stats.tx_packets++;
697 priv->stats.tx_bytes += skb->len;
698 dev_consume_skb_any(skb);
699 return 0;
700 }
701
702 /**
703 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
704 * @dev: Device being shutdown
705 *
706 */
cvm_oct_tx_shutdown_dev(struct net_device * dev)707 void cvm_oct_tx_shutdown_dev(struct net_device *dev)
708 {
709 struct octeon_ethernet *priv = netdev_priv(dev);
710 unsigned long flags;
711 int qos;
712
713 for (qos = 0; qos < 16; qos++) {
714 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
715 while (skb_queue_len(&priv->tx_free_list[qos]))
716 dev_kfree_skb_any(__skb_dequeue
717 (&priv->tx_free_list[qos]));
718 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
719 }
720 }
721
cvm_oct_tx_do_cleanup(unsigned long arg)722 static void cvm_oct_tx_do_cleanup(unsigned long arg)
723 {
724 int port;
725
726 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
727 if (cvm_oct_device[port]) {
728 struct net_device *dev = cvm_oct_device[port];
729
730 cvm_oct_free_tx_skbs(dev);
731 }
732 }
733 }
734
cvm_oct_tx_cleanup_watchdog(int cpl,void * dev_id)735 static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
736 {
737 /* Disable the interrupt. */
738 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
739 /* Do the work in the tasklet. */
740 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
741 return IRQ_HANDLED;
742 }
743
cvm_oct_tx_initialize(void)744 void cvm_oct_tx_initialize(void)
745 {
746 int i;
747
748 /* Disable the interrupt. */
749 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
750 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
751 i = request_irq(OCTEON_IRQ_TIMER1,
752 cvm_oct_tx_cleanup_watchdog, 0,
753 "Ethernet", cvm_oct_device);
754
755 if (i)
756 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
757 }
758
cvm_oct_tx_shutdown(void)759 void cvm_oct_tx_shutdown(void)
760 {
761 /* Free the interrupt handler */
762 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
763 }
764