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