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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
55static void cvm_oct_tx_do_cleanup(unsigned long arg);
56static 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
61static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau)
62{
63 int32_t 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
74static 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
84static void cvm_oct_free_tx_skbs(struct net_device *dev)
85{
86 int32_t 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 */
140int 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 int32_t skb_to_free;
152 int32_t 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 + qos * 4);
224 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
225 goto skip_xmit;
226 }
227 }
228
229 /*
230 * The CN3XXX series of parts has an errata (GMX-401) which
231 * causes the GMX block to hang if a collision occurs towards
232 * the end of a <68 byte packet. As a workaround for this, we
233 * pad packets to be 68 bytes whenever we are in half duplex
234 * mode. We don't handle the case of having a small packet but
235 * no room to add the padding. The kernel should always give
236 * us at least a cache line
237 */
238 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
239 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
240 int interface = INTERFACE(priv->port);
241 int index = INDEX(priv->port);
242
243 if (interface < 2) {
244 /* We only need to pad packet in half duplex mode */
245 gmx_prt_cfg.u64 =
246 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
247 if (gmx_prt_cfg.s.duplex == 0) {
248 int add_bytes = 64 - skb->len;
249
250 if ((skb_tail_pointer(skb) + add_bytes) <=
251 skb_end_pointer(skb))
252 memset(__skb_put(skb, add_bytes), 0,
253 add_bytes);
254 }
255 }
256 }
257
258 /* Build the PKO command */
259 pko_command.u64 = 0;
260#ifdef __LITTLE_ENDIAN
261 pko_command.s.le = 1;
262#endif
263 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
264 pko_command.s.segs = 1;
265 pko_command.s.total_bytes = skb->len;
266 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
267 pko_command.s.subone0 = 1;
268
269 pko_command.s.dontfree = 1;
270
271 /* Build the PKO buffer pointer */
272 hw_buffer.u64 = 0;
273 if (skb_shinfo(skb)->nr_frags == 0) {
274 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
275 hw_buffer.s.pool = 0;
276 hw_buffer.s.size = skb->len;
277 } else {
278 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
279 hw_buffer.s.pool = 0;
280 hw_buffer.s.size = skb_headlen(skb);
281 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
282 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
283 struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i;
284
285 hw_buffer.s.addr = XKPHYS_TO_PHYS(
286 (u64)(page_address(fs->page.p) +
287 fs->page_offset));
288 hw_buffer.s.size = fs->size;
289 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
290 }
291 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
292 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
293 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
294 pko_command.s.gather = 1;
295 goto dont_put_skbuff_in_hw;
296 }
297
298 /*
299 * See if we can put this skb in the FPA pool. Any strange
300 * behavior from the Linux networking stack will most likely
301 * be caused by a bug in the following code. If some field is
302 * in use by the network stack and gets carried over when a
303 * buffer is reused, bad things may happen. If in doubt and
304 * you dont need the absolute best performance, disable the
305 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
306 * shown a 25% increase in performance under some loads.
307 */
308#if REUSE_SKBUFFS_WITHOUT_FREE
309 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
310 if (unlikely(skb->data < fpa_head)) {
311 /* TX buffer beginning can't meet FPA alignment constraints */
312 goto dont_put_skbuff_in_hw;
313 }
314 if (unlikely
315 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
316 /* TX buffer isn't large enough for the FPA */
317 goto dont_put_skbuff_in_hw;
318 }
319 if (unlikely(skb_shared(skb))) {
320 /* TX buffer sharing data with someone else */
321 goto dont_put_skbuff_in_hw;
322 }
323 if (unlikely(skb_cloned(skb))) {
324 /* TX buffer has been cloned */
325 goto dont_put_skbuff_in_hw;
326 }
327 if (unlikely(skb_header_cloned(skb))) {
328 /* TX buffer header has been cloned */
329 goto dont_put_skbuff_in_hw;
330 }
331 if (unlikely(skb->destructor)) {
332 /* TX buffer has a destructor */
333 goto dont_put_skbuff_in_hw;
334 }
335 if (unlikely(skb_shinfo(skb)->nr_frags)) {
336 /* TX buffer has fragments */
337 goto dont_put_skbuff_in_hw;
338 }
339 if (unlikely
340 (skb->truesize !=
341 sizeof(*skb) + skb_end_offset(skb))) {
342 /* TX buffer truesize has been changed */
343 goto dont_put_skbuff_in_hw;
344 }
345
346 /*
347 * We can use this buffer in the FPA. We don't need the FAU
348 * update anymore
349 */
350 pko_command.s.dontfree = 0;
351
352 hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
353 ((unsigned long)fpa_head >> 7);
354
355 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
356
357 /*
358 * The skbuff will be reused without ever being freed. We must
359 * cleanup a bunch of core things.
360 */
361 dst_release(skb_dst(skb));
362 skb_dst_set(skb, NULL);
363#ifdef CONFIG_XFRM
364 secpath_put(skb->sp);
365 skb->sp = NULL;
366#endif
367 nf_reset(skb);
368
369#ifdef CONFIG_NET_SCHED
370 skb->tc_index = 0;
371#ifdef CONFIG_NET_CLS_ACT
372 skb->tc_verd = 0;
373#endif /* CONFIG_NET_CLS_ACT */
374#endif /* CONFIG_NET_SCHED */
375#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
376
377dont_put_skbuff_in_hw:
378
379 /* Check if we can use the hardware checksumming */
380 if ((skb->protocol == htons(ETH_P_IP)) &&
381 (ip_hdr(skb)->version == 4) &&
382 (ip_hdr(skb)->ihl == 5) &&
383 ((ip_hdr(skb)->frag_off == 0) ||
384 (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
385 ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
386 (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
387 /* Use hardware checksum calc */
388 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
389 }
390
391 if (USE_ASYNC_IOBDMA) {
392 /* Get the number of skbuffs in use by the hardware */
393 CVMX_SYNCIOBDMA;
394 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
395 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
396 } else {
397 /* Get the number of skbuffs in use by the hardware */
398 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
399 MAX_SKB_TO_FREE);
400 buffers_to_free =
401 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
402 }
403
404 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
405 priv->fau + qos * 4);
406
407 /*
408 * If we're sending faster than the receive can free them then
409 * don't do the HW free.
410 */
411 if ((buffers_to_free < -100) && !pko_command.s.dontfree)
412 pko_command.s.dontfree = 1;
413
414 if (pko_command.s.dontfree) {
415 queue_type = QUEUE_CORE;
416 pko_command.s.reg0 = priv->fau + qos * 4;
417 } else {
418 queue_type = QUEUE_HW;
419 }
420 if (USE_ASYNC_IOBDMA)
421 cvmx_fau_async_fetch_and_add32(
422 CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
423
424 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
425
426 /* Drop this packet if we have too many already queued to the HW */
427 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
428 MAX_OUT_QUEUE_DEPTH)) {
429 if (dev->tx_queue_len != 0) {
430 /* Drop the lock when notifying the core. */
431 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
432 flags);
433 netif_stop_queue(dev);
434 spin_lock_irqsave(&priv->tx_free_list[qos].lock,
435 flags);
436 } else {
437 /* If not using normal queueing. */
438 queue_type = QUEUE_DROP;
439 goto skip_xmit;
440 }
441 }
442
443 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
444 CVMX_PKO_LOCK_NONE);
445
446 /* Send the packet to the output queue */
447 if (unlikely(cvmx_pko_send_packet_finish(priv->port,
448 priv->queue + qos,
449 pko_command, hw_buffer,
450 CVMX_PKO_LOCK_NONE))) {
451 printk_ratelimited("%s: Failed to send the packet\n",
452 dev->name);
453 queue_type = QUEUE_DROP;
454 }
455skip_xmit:
456 to_free_list = NULL;
457
458 switch (queue_type) {
459 case QUEUE_DROP:
460 skb->next = to_free_list;
461 to_free_list = skb;
462 priv->stats.tx_dropped++;
463 break;
464 case QUEUE_HW:
465 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
466 break;
467 case QUEUE_CORE:
468 __skb_queue_tail(&priv->tx_free_list[qos], skb);
469 break;
470 default:
471 BUG();
472 }
473
474 while (skb_to_free > 0) {
475 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
476
477 t->next = to_free_list;
478 to_free_list = t;
479 skb_to_free--;
480 }
481
482 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
483
484 /* Do the actual freeing outside of the lock. */
485 while (to_free_list) {
486 struct sk_buff *t = to_free_list;
487
488 to_free_list = to_free_list->next;
489 dev_kfree_skb_any(t);
490 }
491
492 if (USE_ASYNC_IOBDMA) {
493 CVMX_SYNCIOBDMA;
494 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
495 /* Restore the scratch area */
496 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
497 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
498 } else {
499 total_to_clean = cvmx_fau_fetch_and_add32(
500 FAU_TOTAL_TX_TO_CLEAN, 1);
501 }
502
503 if (total_to_clean & 0x3ff) {
504 /*
505 * Schedule the cleanup tasklet every 1024 packets for
506 * the pathological case of high traffic on one port
507 * delaying clean up of packets on a different port
508 * that is blocked waiting for the cleanup.
509 */
510 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
511 }
512
513 cvm_oct_kick_tx_poll_watchdog();
514
515 return NETDEV_TX_OK;
516}
517
518/**
519 * cvm_oct_xmit_pow - transmit a packet to the POW
520 * @skb: Packet to send
521 * @dev: Device info structure
522
523 * Returns Always returns zero
524 */
525int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
526{
527 struct octeon_ethernet *priv = netdev_priv(dev);
528 void *packet_buffer;
529 void *copy_location;
530
531 /* Get a work queue entry */
532 cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
533
534 if (unlikely(!work)) {
535 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
536 dev->name);
537 priv->stats.tx_dropped++;
538 dev_kfree_skb_any(skb);
539 return 0;
540 }
541
542 /* Get a packet buffer */
543 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
544 if (unlikely(!packet_buffer)) {
545 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
546 dev->name);
547 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
548 priv->stats.tx_dropped++;
549 dev_kfree_skb_any(skb);
550 return 0;
551 }
552
553 /*
554 * Calculate where we need to copy the data to. We need to
555 * leave 8 bytes for a next pointer (unused). We also need to
556 * include any configure skip. Then we need to align the IP
557 * packet src and dest into the same 64bit word. The below
558 * calculation may add a little extra, but that doesn't
559 * hurt.
560 */
561 copy_location = packet_buffer + sizeof(u64);
562 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
563
564 /*
565 * We have to copy the packet since whoever processes this
566 * packet will free it to a hardware pool. We can't use the
567 * trick of counting outstanding packets like in
568 * cvm_oct_xmit.
569 */
570 memcpy(copy_location, skb->data, skb->len);
571
572 /*
573 * Fill in some of the work queue fields. We may need to add
574 * more if the software at the other end needs them.
575 */
576 if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
577 work->word0.pip.cn38xx.hw_chksum = skb->csum;
578 work->word1.len = skb->len;
579 cvmx_wqe_set_port(work, priv->port);
580 cvmx_wqe_set_qos(work, priv->port & 0x7);
581 cvmx_wqe_set_grp(work, pow_send_group);
582 work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
583 work->word1.tag = pow_send_group; /* FIXME */
584 /* Default to zero. Sets of zero later are commented out */
585 work->word2.u64 = 0;
586 work->word2.s.bufs = 1;
587 work->packet_ptr.u64 = 0;
588 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
589 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
590 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
591 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
592
593 if (skb->protocol == htons(ETH_P_IP)) {
594 work->word2.s.ip_offset = 14;
595#if 0
596 work->word2.s.vlan_valid = 0; /* FIXME */
597 work->word2.s.vlan_cfi = 0; /* FIXME */
598 work->word2.s.vlan_id = 0; /* FIXME */
599 work->word2.s.dec_ipcomp = 0; /* FIXME */
600#endif
601 work->word2.s.tcp_or_udp =
602 (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
603 (ip_hdr(skb)->protocol == IPPROTO_UDP);
604#if 0
605 /* FIXME */
606 work->word2.s.dec_ipsec = 0;
607 /* We only support IPv4 right now */
608 work->word2.s.is_v6 = 0;
609 /* Hardware would set to zero */
610 work->word2.s.software = 0;
611 /* No error, packet is internal */
612 work->word2.s.L4_error = 0;
613#endif
614 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
615 (ip_hdr(skb)->frag_off ==
616 1 << 14));
617#if 0
618 /* Assume Linux is sending a good packet */
619 work->word2.s.IP_exc = 0;
620#endif
621 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
622 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
623#if 0
624 /* This is an IP packet */
625 work->word2.s.not_IP = 0;
626 /* No error, packet is internal */
627 work->word2.s.rcv_error = 0;
628 /* No error, packet is internal */
629 work->word2.s.err_code = 0;
630#endif
631
632 /*
633 * When copying the data, include 4 bytes of the
634 * ethernet header to align the same way hardware
635 * does.
636 */
637 memcpy(work->packet_data, skb->data + 10,
638 sizeof(work->packet_data));
639 } else {
640#if 0
641 work->word2.snoip.vlan_valid = 0; /* FIXME */
642 work->word2.snoip.vlan_cfi = 0; /* FIXME */
643 work->word2.snoip.vlan_id = 0; /* FIXME */
644 work->word2.snoip.software = 0; /* Hardware would set to zero */
645#endif
646 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
647 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
648 work->word2.snoip.is_bcast =
649 (skb->pkt_type == PACKET_BROADCAST);
650 work->word2.snoip.is_mcast =
651 (skb->pkt_type == PACKET_MULTICAST);
652 work->word2.snoip.not_IP = 1; /* IP was done up above */
653#if 0
654 /* No error, packet is internal */
655 work->word2.snoip.rcv_error = 0;
656 /* No error, packet is internal */
657 work->word2.snoip.err_code = 0;
658#endif
659 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
660 }
661
662 /* Submit the packet to the POW */
663 cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
664 cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
665 priv->stats.tx_packets++;
666 priv->stats.tx_bytes += skb->len;
667 dev_consume_skb_any(skb);
668 return 0;
669}
670
671/**
672 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
673 * @dev: Device being shutdown
674 *
675 */
676void cvm_oct_tx_shutdown_dev(struct net_device *dev)
677{
678 struct octeon_ethernet *priv = netdev_priv(dev);
679 unsigned long flags;
680 int qos;
681
682 for (qos = 0; qos < 16; qos++) {
683 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
684 while (skb_queue_len(&priv->tx_free_list[qos]))
685 dev_kfree_skb_any(__skb_dequeue
686 (&priv->tx_free_list[qos]));
687 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
688 }
689}
690
691static void cvm_oct_tx_do_cleanup(unsigned long arg)
692{
693 int port;
694
695 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
696 if (cvm_oct_device[port]) {
697 struct net_device *dev = cvm_oct_device[port];
698
699 cvm_oct_free_tx_skbs(dev);
700 }
701 }
702}
703
704static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
705{
706 /* Disable the interrupt. */
707 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
708 /* Do the work in the tasklet. */
709 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
710 return IRQ_HANDLED;
711}
712
713void cvm_oct_tx_initialize(void)
714{
715 int i;
716
717 /* Disable the interrupt. */
718 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
719 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
720 i = request_irq(OCTEON_IRQ_TIMER1,
721 cvm_oct_tx_cleanup_watchdog, 0,
722 "Ethernet", cvm_oct_device);
723
724 if (i)
725 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
726}
727
728void cvm_oct_tx_shutdown(void)
729{
730 /* Free the interrupt handler */
731 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
732}
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 <linux/interrupt.h>
36#include <net/dst.h>
37#ifdef CONFIG_XFRM
38#include <linux/xfrm.h>
39#include <net/xfrm.h>
40#endif /* CONFIG_XFRM */
41
42#include <linux/atomic.h>
43
44#include <asm/octeon/octeon.h>
45
46#include "ethernet-defines.h"
47#include "octeon-ethernet.h"
48#include "ethernet-tx.h"
49#include "ethernet-util.h"
50
51#include <asm/octeon/cvmx-wqe.h>
52#include <asm/octeon/cvmx-fau.h>
53#include <asm/octeon/cvmx-pip.h>
54#include <asm/octeon/cvmx-pko.h>
55#include <asm/octeon/cvmx-helper.h>
56
57#include <asm/octeon/cvmx-gmxx-defs.h>
58
59#define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))
60
61/*
62 * You can define GET_SKBUFF_QOS() to override how the skbuff output
63 * function determines which output queue is used. The default
64 * implementation always uses the base queue for the port. If, for
65 * example, you wanted to use the skb->priority field, define
66 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
67 */
68#ifndef GET_SKBUFF_QOS
69#define GET_SKBUFF_QOS(skb) 0
70#endif
71
72static void cvm_oct_tx_do_cleanup(unsigned long arg);
73static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
74
75/* Maximum number of SKBs to try to free per xmit packet. */
76#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
77
78static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau)
79{
80 int32_t undo;
81 undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE;
82 if (undo > 0)
83 cvmx_fau_atomic_add32(fau, -undo);
84 skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : -skb_to_free;
85 return skb_to_free;
86}
87
88static void cvm_oct_kick_tx_poll_watchdog(void)
89{
90 union cvmx_ciu_timx ciu_timx;
91 ciu_timx.u64 = 0;
92 ciu_timx.s.one_shot = 1;
93 ciu_timx.s.len = cvm_oct_tx_poll_interval;
94 cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
95}
96
97void cvm_oct_free_tx_skbs(struct net_device *dev)
98{
99 int32_t skb_to_free;
100 int qos, queues_per_port;
101 int total_freed = 0;
102 int total_remaining = 0;
103 unsigned long flags;
104 struct octeon_ethernet *priv = netdev_priv(dev);
105
106 queues_per_port = cvmx_pko_get_num_queues(priv->port);
107 /* Drain any pending packets in the free list */
108 for (qos = 0; qos < queues_per_port; qos++) {
109 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
110 continue;
111 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4, MAX_SKB_TO_FREE);
112 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
113
114
115 total_freed += skb_to_free;
116 if (skb_to_free > 0) {
117 struct sk_buff *to_free_list = NULL;
118 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
119 while (skb_to_free > 0) {
120 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
121 t->next = to_free_list;
122 to_free_list = t;
123 skb_to_free--;
124 }
125 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
126 /* Do the actual freeing outside of the lock. */
127 while (to_free_list) {
128 struct sk_buff *t = to_free_list;
129 to_free_list = to_free_list->next;
130 dev_kfree_skb_any(t);
131 }
132 }
133 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
134 }
135 if (total_freed >= 0 && netif_queue_stopped(dev))
136 netif_wake_queue(dev);
137 if (total_remaining)
138 cvm_oct_kick_tx_poll_watchdog();
139}
140
141/**
142 * cvm_oct_xmit - transmit a packet
143 * @skb: Packet to send
144 * @dev: Device info structure
145 *
146 * Returns Always returns NETDEV_TX_OK
147 */
148int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
149{
150 cvmx_pko_command_word0_t pko_command;
151 union cvmx_buf_ptr hw_buffer;
152 uint64_t old_scratch;
153 uint64_t old_scratch2;
154 int qos;
155 int i;
156 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
157 struct octeon_ethernet *priv = netdev_priv(dev);
158 struct sk_buff *to_free_list;
159 int32_t skb_to_free;
160 int32_t buffers_to_free;
161 u32 total_to_clean;
162 unsigned long flags;
163#if REUSE_SKBUFFS_WITHOUT_FREE
164 unsigned char *fpa_head;
165#endif
166
167 /*
168 * Prefetch the private data structure. It is larger than the
169 * one cache line.
170 */
171 prefetch(priv);
172
173 /*
174 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
175 * completely remove "qos" in the event neither interface
176 * supports multiple queues per port.
177 */
178 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
179 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
180 qos = GET_SKBUFF_QOS(skb);
181 if (qos <= 0)
182 qos = 0;
183 else if (qos >= cvmx_pko_get_num_queues(priv->port))
184 qos = 0;
185 } else
186 qos = 0;
187
188 if (USE_ASYNC_IOBDMA) {
189 /* Save scratch in case userspace is using it */
190 CVMX_SYNCIOBDMA;
191 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
192 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
193
194 /*
195 * Fetch and increment the number of packets to be
196 * freed.
197 */
198 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
199 FAU_NUM_PACKET_BUFFERS_TO_FREE,
200 0);
201 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
202 priv->fau + qos * 4,
203 MAX_SKB_TO_FREE);
204 }
205
206 /*
207 * We have space for 6 segment pointers, If there will be more
208 * than that, we must linearize.
209 */
210 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
211 if (unlikely(__skb_linearize(skb))) {
212 queue_type = QUEUE_DROP;
213 if (USE_ASYNC_IOBDMA) {
214 /* Get the number of skbuffs in use by the hardware */
215 CVMX_SYNCIOBDMA;
216 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
217 } else {
218 /* Get the number of skbuffs in use by the hardware */
219 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
220 MAX_SKB_TO_FREE);
221 }
222 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau + qos * 4);
223 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
224 goto skip_xmit;
225 }
226 }
227
228 /*
229 * The CN3XXX series of parts has an errata (GMX-401) which
230 * causes the GMX block to hang if a collision occurs towards
231 * the end of a <68 byte packet. As a workaround for this, we
232 * pad packets to be 68 bytes whenever we are in half duplex
233 * mode. We don't handle the case of having a small packet but
234 * no room to add the padding. The kernel should always give
235 * us at least a cache line
236 */
237 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
238 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
239 int interface = INTERFACE(priv->port);
240 int index = INDEX(priv->port);
241
242 if (interface < 2) {
243 /* We only need to pad packet in half duplex mode */
244 gmx_prt_cfg.u64 =
245 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
246 if (gmx_prt_cfg.s.duplex == 0) {
247 int add_bytes = 64 - skb->len;
248 if ((skb_tail_pointer(skb) + add_bytes) <=
249 skb_end_pointer(skb))
250 memset(__skb_put(skb, add_bytes), 0,
251 add_bytes);
252 }
253 }
254 }
255
256 /* Build the PKO command */
257 pko_command.u64 = 0;
258 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
259 pko_command.s.segs = 1;
260 pko_command.s.total_bytes = skb->len;
261 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
262 pko_command.s.subone0 = 1;
263
264 pko_command.s.dontfree = 1;
265
266 /* Build the PKO buffer pointer */
267 hw_buffer.u64 = 0;
268 if (skb_shinfo(skb)->nr_frags == 0) {
269 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
270 hw_buffer.s.pool = 0;
271 hw_buffer.s.size = skb->len;
272 } else {
273 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
274 hw_buffer.s.pool = 0;
275 hw_buffer.s.size = skb_headlen(skb);
276 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
277 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
278 struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i;
279 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)(page_address(fs->page.p) + fs->page_offset));
280 hw_buffer.s.size = fs->size;
281 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
282 }
283 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
284 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
285 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
286 pko_command.s.gather = 1;
287 goto dont_put_skbuff_in_hw;
288 }
289
290 /*
291 * See if we can put this skb in the FPA pool. Any strange
292 * behavior from the Linux networking stack will most likely
293 * be caused by a bug in the following code. If some field is
294 * in use by the network stack and gets carried over when a
295 * buffer is reused, bad things may happen. If in doubt and
296 * you dont need the absolute best performance, disable the
297 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
298 * shown a 25% increase in performance under some loads.
299 */
300#if REUSE_SKBUFFS_WITHOUT_FREE
301 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
302 if (unlikely(skb->data < fpa_head)) {
303 /*
304 * printk("TX buffer beginning can't meet FPA
305 * alignment constraints\n");
306 */
307 goto dont_put_skbuff_in_hw;
308 }
309 if (unlikely
310 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
311 /*
312 printk("TX buffer isn't large enough for the FPA\n");
313 */
314 goto dont_put_skbuff_in_hw;
315 }
316 if (unlikely(skb_shared(skb))) {
317 /*
318 printk("TX buffer sharing data with someone else\n");
319 */
320 goto dont_put_skbuff_in_hw;
321 }
322 if (unlikely(skb_cloned(skb))) {
323 /*
324 printk("TX buffer has been cloned\n");
325 */
326 goto dont_put_skbuff_in_hw;
327 }
328 if (unlikely(skb_header_cloned(skb))) {
329 /*
330 printk("TX buffer header has been cloned\n");
331 */
332 goto dont_put_skbuff_in_hw;
333 }
334 if (unlikely(skb->destructor)) {
335 /*
336 printk("TX buffer has a destructor\n");
337 */
338 goto dont_put_skbuff_in_hw;
339 }
340 if (unlikely(skb_shinfo(skb)->nr_frags)) {
341 /*
342 printk("TX buffer has fragments\n");
343 */
344 goto dont_put_skbuff_in_hw;
345 }
346 if (unlikely
347 (skb->truesize !=
348 sizeof(*skb) + skb_end_offset(skb))) {
349 /*
350 printk("TX buffer truesize has been changed\n");
351 */
352 goto dont_put_skbuff_in_hw;
353 }
354
355 /*
356 * We can use this buffer in the FPA. We don't need the FAU
357 * update anymore
358 */
359 pko_command.s.dontfree = 0;
360
361 hw_buffer.s.back = ((unsigned long)skb->data >> 7) - ((unsigned long)fpa_head >> 7);
362 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
363
364 /*
365 * The skbuff will be reused without ever being freed. We must
366 * cleanup a bunch of core things.
367 */
368 dst_release(skb_dst(skb));
369 skb_dst_set(skb, NULL);
370#ifdef CONFIG_XFRM
371 secpath_put(skb->sp);
372 skb->sp = NULL;
373#endif
374 nf_reset(skb);
375
376#ifdef CONFIG_NET_SCHED
377 skb->tc_index = 0;
378#ifdef CONFIG_NET_CLS_ACT
379 skb->tc_verd = 0;
380#endif /* CONFIG_NET_CLS_ACT */
381#endif /* CONFIG_NET_SCHED */
382#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
383
384dont_put_skbuff_in_hw:
385
386 /* Check if we can use the hardware checksumming */
387 if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) &&
388 (ip_hdr(skb)->version == 4) && (ip_hdr(skb)->ihl == 5) &&
389 ((ip_hdr(skb)->frag_off == 0) || (ip_hdr(skb)->frag_off == 1 << 14))
390 && ((ip_hdr(skb)->protocol == IPPROTO_TCP)
391 || (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
392 /* Use hardware checksum calc */
393 pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1;
394 }
395
396 if (USE_ASYNC_IOBDMA) {
397 /* Get the number of skbuffs in use by the hardware */
398 CVMX_SYNCIOBDMA;
399 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
400 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
401 } else {
402 /* Get the number of skbuffs in use by the hardware */
403 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
404 MAX_SKB_TO_FREE);
405 buffers_to_free =
406 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
407 }
408
409 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
410
411 /*
412 * If we're sending faster than the receive can free them then
413 * don't do the HW free.
414 */
415 if ((buffers_to_free < -100) && !pko_command.s.dontfree)
416 pko_command.s.dontfree = 1;
417
418 if (pko_command.s.dontfree) {
419 queue_type = QUEUE_CORE;
420 pko_command.s.reg0 = priv->fau+qos*4;
421 } else {
422 queue_type = QUEUE_HW;
423 }
424 if (USE_ASYNC_IOBDMA)
425 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
426
427 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
428
429 /* Drop this packet if we have too many already queued to the HW */
430 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= MAX_OUT_QUEUE_DEPTH)) {
431 if (dev->tx_queue_len != 0) {
432 /* Drop the lock when notifying the core. */
433 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
434 netif_stop_queue(dev);
435 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
436 } else {
437 /* If not using normal queueing. */
438 queue_type = QUEUE_DROP;
439 goto skip_xmit;
440 }
441 }
442
443 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
444 CVMX_PKO_LOCK_NONE);
445
446 /* Send the packet to the output queue */
447 if (unlikely(cvmx_pko_send_packet_finish(priv->port,
448 priv->queue + qos,
449 pko_command, hw_buffer,
450 CVMX_PKO_LOCK_NONE))) {
451 printk_ratelimited("%s: Failed to send the packet\n", dev->name);
452 queue_type = QUEUE_DROP;
453 }
454skip_xmit:
455 to_free_list = NULL;
456
457 switch (queue_type) {
458 case QUEUE_DROP:
459 skb->next = to_free_list;
460 to_free_list = skb;
461 priv->stats.tx_dropped++;
462 break;
463 case QUEUE_HW:
464 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
465 break;
466 case QUEUE_CORE:
467 __skb_queue_tail(&priv->tx_free_list[qos], skb);
468 break;
469 default:
470 BUG();
471 }
472
473 while (skb_to_free > 0) {
474 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
475 t->next = to_free_list;
476 to_free_list = t;
477 skb_to_free--;
478 }
479
480 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
481
482 /* Do the actual freeing outside of the lock. */
483 while (to_free_list) {
484 struct sk_buff *t = to_free_list;
485 to_free_list = to_free_list->next;
486 dev_kfree_skb_any(t);
487 }
488
489 if (USE_ASYNC_IOBDMA) {
490 CVMX_SYNCIOBDMA;
491 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
492 /* Restore the scratch area */
493 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
494 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
495 } else {
496 total_to_clean = cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
497 }
498
499 if (total_to_clean & 0x3ff) {
500 /*
501 * Schedule the cleanup tasklet every 1024 packets for
502 * the pathological case of high traffic on one port
503 * delaying clean up of packets on a different port
504 * that is blocked waiting for the cleanup.
505 */
506 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
507 }
508
509 cvm_oct_kick_tx_poll_watchdog();
510
511 return NETDEV_TX_OK;
512}
513
514/**
515 * cvm_oct_xmit_pow - transmit a packet to the POW
516 * @skb: Packet to send
517 * @dev: Device info structure
518
519 * Returns Always returns zero
520 */
521int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
522{
523 struct octeon_ethernet *priv = netdev_priv(dev);
524 void *packet_buffer;
525 void *copy_location;
526
527 /* Get a work queue entry */
528 cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
529 if (unlikely(work == NULL)) {
530 printk_ratelimited("%s: Failed to allocate a work "
531 "queue entry\n", dev->name);
532 priv->stats.tx_dropped++;
533 dev_kfree_skb(skb);
534 return 0;
535 }
536
537 /* Get a packet buffer */
538 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
539 if (unlikely(packet_buffer == NULL)) {
540 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
541 dev->name);
542 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1));
543 priv->stats.tx_dropped++;
544 dev_kfree_skb(skb);
545 return 0;
546 }
547
548 /*
549 * Calculate where we need to copy the data to. We need to
550 * leave 8 bytes for a next pointer (unused). We also need to
551 * include any configure skip. Then we need to align the IP
552 * packet src and dest into the same 64bit word. The below
553 * calculation may add a little extra, but that doesn't
554 * hurt.
555 */
556 copy_location = packet_buffer + sizeof(uint64_t);
557 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
558
559 /*
560 * We have to copy the packet since whoever processes this
561 * packet will free it to a hardware pool. We can't use the
562 * trick of counting outstanding packets like in
563 * cvm_oct_xmit.
564 */
565 memcpy(copy_location, skb->data, skb->len);
566
567 /*
568 * Fill in some of the work queue fields. We may need to add
569 * more if the software at the other end needs them.
570 */
571 work->hw_chksum = skb->csum;
572 work->len = skb->len;
573 work->ipprt = priv->port;
574 work->qos = priv->port & 0x7;
575 work->grp = pow_send_group;
576 work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
577 work->tag = pow_send_group; /* FIXME */
578 /* Default to zero. Sets of zero later are commented out */
579 work->word2.u64 = 0;
580 work->word2.s.bufs = 1;
581 work->packet_ptr.u64 = 0;
582 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
583 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
584 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
585 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
586
587 if (skb->protocol == htons(ETH_P_IP)) {
588 work->word2.s.ip_offset = 14;
589#if 0
590 work->word2.s.vlan_valid = 0; /* FIXME */
591 work->word2.s.vlan_cfi = 0; /* FIXME */
592 work->word2.s.vlan_id = 0; /* FIXME */
593 work->word2.s.dec_ipcomp = 0; /* FIXME */
594#endif
595 work->word2.s.tcp_or_udp =
596 (ip_hdr(skb)->protocol == IPPROTO_TCP)
597 || (ip_hdr(skb)->protocol == IPPROTO_UDP);
598#if 0
599 /* FIXME */
600 work->word2.s.dec_ipsec = 0;
601 /* We only support IPv4 right now */
602 work->word2.s.is_v6 = 0;
603 /* Hardware would set to zero */
604 work->word2.s.software = 0;
605 /* No error, packet is internal */
606 work->word2.s.L4_error = 0;
607#endif
608 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0)
609 || (ip_hdr(skb)->frag_off ==
610 1 << 14));
611#if 0
612 /* Assume Linux is sending a good packet */
613 work->word2.s.IP_exc = 0;
614#endif
615 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
616 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
617#if 0
618 /* This is an IP packet */
619 work->word2.s.not_IP = 0;
620 /* No error, packet is internal */
621 work->word2.s.rcv_error = 0;
622 /* No error, packet is internal */
623 work->word2.s.err_code = 0;
624#endif
625
626 /*
627 * When copying the data, include 4 bytes of the
628 * ethernet header to align the same way hardware
629 * does.
630 */
631 memcpy(work->packet_data, skb->data + 10,
632 sizeof(work->packet_data));
633 } else {
634#if 0
635 work->word2.snoip.vlan_valid = 0; /* FIXME */
636 work->word2.snoip.vlan_cfi = 0; /* FIXME */
637 work->word2.snoip.vlan_id = 0; /* FIXME */
638 work->word2.snoip.software = 0; /* Hardware would set to zero */
639#endif
640 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
641 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
642 work->word2.snoip.is_bcast =
643 (skb->pkt_type == PACKET_BROADCAST);
644 work->word2.snoip.is_mcast =
645 (skb->pkt_type == PACKET_MULTICAST);
646 work->word2.snoip.not_IP = 1; /* IP was done up above */
647#if 0
648 /* No error, packet is internal */
649 work->word2.snoip.rcv_error = 0;
650 /* No error, packet is internal */
651 work->word2.snoip.err_code = 0;
652#endif
653 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
654 }
655
656 /* Submit the packet to the POW */
657 cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos,
658 work->grp);
659 priv->stats.tx_packets++;
660 priv->stats.tx_bytes += skb->len;
661 dev_kfree_skb(skb);
662 return 0;
663}
664
665/**
666 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
667 * @dev: Device being shutdown
668 *
669 */
670void cvm_oct_tx_shutdown_dev(struct net_device *dev)
671{
672 struct octeon_ethernet *priv = netdev_priv(dev);
673 unsigned long flags;
674 int qos;
675
676 for (qos = 0; qos < 16; qos++) {
677 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
678 while (skb_queue_len(&priv->tx_free_list[qos]))
679 dev_kfree_skb_any(__skb_dequeue
680 (&priv->tx_free_list[qos]));
681 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
682 }
683}
684
685static void cvm_oct_tx_do_cleanup(unsigned long arg)
686{
687 int port;
688
689 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
690 if (cvm_oct_device[port]) {
691 struct net_device *dev = cvm_oct_device[port];
692 cvm_oct_free_tx_skbs(dev);
693 }
694 }
695}
696
697static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
698{
699 /* Disable the interrupt. */
700 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
701 /* Do the work in the tasklet. */
702 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
703 return IRQ_HANDLED;
704}
705
706void cvm_oct_tx_initialize(void)
707{
708 int i;
709
710 /* Disable the interrupt. */
711 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
712 /* Register an IRQ hander for to receive CIU_TIMX(1) interrupts */
713 i = request_irq(OCTEON_IRQ_TIMER1,
714 cvm_oct_tx_cleanup_watchdog, 0,
715 "Ethernet", cvm_oct_device);
716
717 if (i)
718 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
719}
720
721void cvm_oct_tx_shutdown(void)
722{
723 /* Free the interrupt handler */
724 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
725}