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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * This file is based on code from OCTEON SDK by Cavium Networks.
4 *
5 * Copyright (c) 2003-2010 Cavium Networks
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/netdevice.h>
11#include <linux/etherdevice.h>
12#include <linux/ip.h>
13#include <linux/ratelimit.h>
14#include <linux/string.h>
15#include <linux/interrupt.h>
16#include <net/dst.h>
17#ifdef CONFIG_XFRM
18#include <linux/xfrm.h>
19#include <net/xfrm.h>
20#endif /* CONFIG_XFRM */
21
22#include <linux/atomic.h>
23#include <net/sch_generic.h>
24
25#include <asm/octeon/octeon.h>
26
27#include "ethernet-defines.h"
28#include "octeon-ethernet.h"
29#include "ethernet-tx.h"
30#include "ethernet-util.h"
31
32#include <asm/octeon/cvmx-wqe.h>
33#include <asm/octeon/cvmx-fau.h>
34#include <asm/octeon/cvmx-pip.h>
35#include <asm/octeon/cvmx-pko.h>
36#include <asm/octeon/cvmx-helper.h>
37
38#include <asm/octeon/cvmx-gmxx-defs.h>
39
40#define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))
41
42/*
43 * You can define GET_SKBUFF_QOS() to override how the skbuff output
44 * function determines which output queue is used. The default
45 * implementation always uses the base queue for the port. If, for
46 * example, you wanted to use the skb->priority field, define
47 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
48 */
49#ifndef GET_SKBUFF_QOS
50#define GET_SKBUFF_QOS(skb) 0
51#endif
52
53static void cvm_oct_tx_do_cleanup(unsigned long arg);
54static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
55
56/* Maximum number of SKBs to try to free per xmit packet. */
57#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
58
59static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
60{
61 int undo;
62
63 undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
64 MAX_SKB_TO_FREE;
65 if (undo > 0)
66 cvmx_fau_atomic_add32(fau, -undo);
67 skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
68 -skb_to_free;
69 return skb_to_free;
70}
71
72static void cvm_oct_kick_tx_poll_watchdog(void)
73{
74 union cvmx_ciu_timx ciu_timx;
75
76 ciu_timx.u64 = 0;
77 ciu_timx.s.one_shot = 1;
78 ciu_timx.s.len = cvm_oct_tx_poll_interval;
79 cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
80}
81
82static void cvm_oct_free_tx_skbs(struct net_device *dev)
83{
84 int skb_to_free;
85 int qos, queues_per_port;
86 int total_freed = 0;
87 int total_remaining = 0;
88 unsigned long flags;
89 struct octeon_ethernet *priv = netdev_priv(dev);
90
91 queues_per_port = cvmx_pko_get_num_queues(priv->port);
92 /* Drain any pending packets in the free list */
93 for (qos = 0; qos < queues_per_port; qos++) {
94 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
95 continue;
96 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
97 MAX_SKB_TO_FREE);
98 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
99 priv->fau + qos * 4);
100 total_freed += skb_to_free;
101 if (skb_to_free > 0) {
102 struct sk_buff *to_free_list = NULL;
103
104 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
105 while (skb_to_free > 0) {
106 struct sk_buff *t;
107
108 t = __skb_dequeue(&priv->tx_free_list[qos]);
109 t->next = to_free_list;
110 to_free_list = t;
111 skb_to_free--;
112 }
113 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
114 flags);
115 /* Do the actual freeing outside of the lock. */
116 while (to_free_list) {
117 struct sk_buff *t = to_free_list;
118
119 to_free_list = to_free_list->next;
120 dev_kfree_skb_any(t);
121 }
122 }
123 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
124 }
125 if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
126 netif_wake_queue(dev);
127 if (total_remaining)
128 cvm_oct_kick_tx_poll_watchdog();
129}
130
131/**
132 * cvm_oct_xmit - transmit a packet
133 * @skb: Packet to send
134 * @dev: Device info structure
135 *
136 * Returns Always returns NETDEV_TX_OK
137 */
138int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
139{
140 cvmx_pko_command_word0_t pko_command;
141 union cvmx_buf_ptr hw_buffer;
142 u64 old_scratch;
143 u64 old_scratch2;
144 int qos;
145 int i;
146 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
147 struct octeon_ethernet *priv = netdev_priv(dev);
148 struct sk_buff *to_free_list;
149 int skb_to_free;
150 int buffers_to_free;
151 u32 total_to_clean;
152 unsigned long flags;
153#if REUSE_SKBUFFS_WITHOUT_FREE
154 unsigned char *fpa_head;
155#endif
156
157 /*
158 * Prefetch the private data structure. It is larger than the
159 * one cache line.
160 */
161 prefetch(priv);
162
163 /*
164 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
165 * completely remove "qos" in the event neither interface
166 * supports multiple queues per port.
167 */
168 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
169 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
170 qos = GET_SKBUFF_QOS(skb);
171 if (qos <= 0)
172 qos = 0;
173 else if (qos >= cvmx_pko_get_num_queues(priv->port))
174 qos = 0;
175 } else {
176 qos = 0;
177 }
178
179 if (USE_ASYNC_IOBDMA) {
180 /* Save scratch in case userspace is using it */
181 CVMX_SYNCIOBDMA;
182 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
183 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
184
185 /*
186 * Fetch and increment the number of packets to be
187 * freed.
188 */
189 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
190 FAU_NUM_PACKET_BUFFERS_TO_FREE,
191 0);
192 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
193 priv->fau + qos * 4,
194 MAX_SKB_TO_FREE);
195 }
196
197 /*
198 * We have space for 6 segment pointers, If there will be more
199 * than that, we must linearize.
200 */
201 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
202 if (unlikely(__skb_linearize(skb))) {
203 queue_type = QUEUE_DROP;
204 if (USE_ASYNC_IOBDMA) {
205 /*
206 * Get the number of skbuffs in use
207 * by the hardware
208 */
209 CVMX_SYNCIOBDMA;
210 skb_to_free =
211 cvmx_scratch_read64(CVMX_SCR_SCRATCH);
212 } else {
213 /*
214 * Get the number of skbuffs in use
215 * by the hardware
216 */
217 skb_to_free = cvmx_fau_fetch_and_add32(
218 priv->fau + qos * 4, MAX_SKB_TO_FREE);
219 }
220 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
221 priv->fau +
222 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
249 if ((skb_tail_pointer(skb) + add_bytes) <=
250 skb_end_pointer(skb))
251 __skb_put_zero(skb, add_bytes);
252 }
253 }
254 }
255
256 /* Build the PKO command */
257 pko_command.u64 = 0;
258#ifdef __LITTLE_ENDIAN
259 pko_command.s.le = 1;
260#endif
261 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
262 pko_command.s.segs = 1;
263 pko_command.s.total_bytes = skb->len;
264 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
265 pko_command.s.subone0 = 1;
266
267 pko_command.s.dontfree = 1;
268
269 /* Build the PKO buffer pointer */
270 hw_buffer.u64 = 0;
271 if (skb_shinfo(skb)->nr_frags == 0) {
272 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
273 hw_buffer.s.pool = 0;
274 hw_buffer.s.size = skb->len;
275 } else {
276 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
277 hw_buffer.s.pool = 0;
278 hw_buffer.s.size = skb_headlen(skb);
279 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
280 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
281 struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i;
282
283 hw_buffer.s.addr = XKPHYS_TO_PHYS(
284 (u64)(page_address(fs->page.p) +
285 fs->page_offset));
286 hw_buffer.s.size = fs->size;
287 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
288 }
289 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
290 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
291 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
292 pko_command.s.gather = 1;
293 goto dont_put_skbuff_in_hw;
294 }
295
296 /*
297 * See if we can put this skb in the FPA pool. Any strange
298 * behavior from the Linux networking stack will most likely
299 * be caused by a bug in the following code. If some field is
300 * in use by the network stack and gets carried over when a
301 * buffer is reused, bad things may happen. If in doubt and
302 * you dont need the absolute best performance, disable the
303 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
304 * shown a 25% increase in performance under some loads.
305 */
306#if REUSE_SKBUFFS_WITHOUT_FREE
307 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
308 if (unlikely(skb->data < fpa_head)) {
309 /* TX buffer beginning can't meet FPA alignment constraints */
310 goto dont_put_skbuff_in_hw;
311 }
312 if (unlikely
313 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
314 /* TX buffer isn't large enough for the FPA */
315 goto dont_put_skbuff_in_hw;
316 }
317 if (unlikely(skb_shared(skb))) {
318 /* TX buffer sharing data with someone else */
319 goto dont_put_skbuff_in_hw;
320 }
321 if (unlikely(skb_cloned(skb))) {
322 /* TX buffer has been cloned */
323 goto dont_put_skbuff_in_hw;
324 }
325 if (unlikely(skb_header_cloned(skb))) {
326 /* TX buffer header has been cloned */
327 goto dont_put_skbuff_in_hw;
328 }
329 if (unlikely(skb->destructor)) {
330 /* TX buffer has a destructor */
331 goto dont_put_skbuff_in_hw;
332 }
333 if (unlikely(skb_shinfo(skb)->nr_frags)) {
334 /* TX buffer has fragments */
335 goto dont_put_skbuff_in_hw;
336 }
337 if (unlikely
338 (skb->truesize !=
339 sizeof(*skb) + skb_end_offset(skb))) {
340 /* TX buffer truesize has been changed */
341 goto dont_put_skbuff_in_hw;
342 }
343
344 /*
345 * We can use this buffer in the FPA. We don't need the FAU
346 * update anymore
347 */
348 pko_command.s.dontfree = 0;
349
350 hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
351 ((unsigned long)fpa_head >> 7);
352
353 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
354
355 /*
356 * The skbuff will be reused without ever being freed. We must
357 * cleanup a bunch of core things.
358 */
359 dst_release(skb_dst(skb));
360 skb_dst_set(skb, NULL);
361#ifdef CONFIG_XFRM
362 secpath_put(skb->sp);
363 skb->sp = NULL;
364#endif
365 nf_reset(skb);
366
367#ifdef CONFIG_NET_SCHED
368 skb->tc_index = 0;
369 skb_reset_tc(skb);
370#endif /* CONFIG_NET_SCHED */
371#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
372
373dont_put_skbuff_in_hw:
374
375 /* Check if we can use the hardware checksumming */
376 if ((skb->protocol == htons(ETH_P_IP)) &&
377 (ip_hdr(skb)->version == 4) &&
378 (ip_hdr(skb)->ihl == 5) &&
379 ((ip_hdr(skb)->frag_off == 0) ||
380 (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
381 ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
382 (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
383 /* Use hardware checksum calc */
384 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
385 }
386
387 if (USE_ASYNC_IOBDMA) {
388 /* Get the number of skbuffs in use by the hardware */
389 CVMX_SYNCIOBDMA;
390 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
391 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
392 } else {
393 /* Get the number of skbuffs in use by the hardware */
394 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
395 MAX_SKB_TO_FREE);
396 buffers_to_free =
397 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
398 }
399
400 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
401 priv->fau + qos * 4);
402
403 /*
404 * If we're sending faster than the receive can free them then
405 * don't do the HW free.
406 */
407 if ((buffers_to_free < -100) && !pko_command.s.dontfree)
408 pko_command.s.dontfree = 1;
409
410 if (pko_command.s.dontfree) {
411 queue_type = QUEUE_CORE;
412 pko_command.s.reg0 = priv->fau + qos * 4;
413 } else {
414 queue_type = QUEUE_HW;
415 }
416 if (USE_ASYNC_IOBDMA)
417 cvmx_fau_async_fetch_and_add32(
418 CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
419
420 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
421
422 /* Drop this packet if we have too many already queued to the HW */
423 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
424 MAX_OUT_QUEUE_DEPTH)) {
425 if (dev->tx_queue_len != 0) {
426 /* Drop the lock when notifying the core. */
427 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
428 flags);
429 netif_stop_queue(dev);
430 spin_lock_irqsave(&priv->tx_free_list[qos].lock,
431 flags);
432 } else {
433 /* If not using normal queueing. */
434 queue_type = QUEUE_DROP;
435 goto skip_xmit;
436 }
437 }
438
439 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
440 CVMX_PKO_LOCK_NONE);
441
442 /* Send the packet to the output queue */
443 if (unlikely(cvmx_pko_send_packet_finish(priv->port,
444 priv->queue + qos,
445 pko_command, hw_buffer,
446 CVMX_PKO_LOCK_NONE))) {
447 printk_ratelimited("%s: Failed to send the packet\n",
448 dev->name);
449 queue_type = QUEUE_DROP;
450 }
451skip_xmit:
452 to_free_list = NULL;
453
454 switch (queue_type) {
455 case QUEUE_DROP:
456 skb->next = to_free_list;
457 to_free_list = skb;
458 dev->stats.tx_dropped++;
459 break;
460 case QUEUE_HW:
461 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
462 break;
463 case QUEUE_CORE:
464 __skb_queue_tail(&priv->tx_free_list[qos], skb);
465 break;
466 default:
467 BUG();
468 }
469
470 while (skb_to_free > 0) {
471 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
472
473 t->next = to_free_list;
474 to_free_list = t;
475 skb_to_free--;
476 }
477
478 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
479
480 /* Do the actual freeing outside of the lock. */
481 while (to_free_list) {
482 struct sk_buff *t = to_free_list;
483
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(
496 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
530 if (unlikely(!work)) {
531 printk_ratelimited("%s: Failed to allocate a work queue entry\n",
532 dev->name);
533 dev->stats.tx_dropped++;
534 dev_kfree_skb_any(skb);
535 return 0;
536 }
537
538 /* Get a packet buffer */
539 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
540 if (unlikely(!packet_buffer)) {
541 printk_ratelimited("%s: Failed to allocate a packet buffer\n",
542 dev->name);
543 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
544 dev->stats.tx_dropped++;
545 dev_kfree_skb_any(skb);
546 return 0;
547 }
548
549 /*
550 * Calculate where we need to copy the data to. We need to
551 * leave 8 bytes for a next pointer (unused). We also need to
552 * include any configure skip. Then we need to align the IP
553 * packet src and dest into the same 64bit word. The below
554 * calculation may add a little extra, but that doesn't
555 * hurt.
556 */
557 copy_location = packet_buffer + sizeof(u64);
558 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
559
560 /*
561 * We have to copy the packet since whoever processes this
562 * packet will free it to a hardware pool. We can't use the
563 * trick of counting outstanding packets like in
564 * cvm_oct_xmit.
565 */
566 memcpy(copy_location, skb->data, skb->len);
567
568 /*
569 * Fill in some of the work queue fields. We may need to add
570 * more if the software at the other end needs them.
571 */
572 if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
573 work->word0.pip.cn38xx.hw_chksum = skb->csum;
574 work->word1.len = skb->len;
575 cvmx_wqe_set_port(work, priv->port);
576 cvmx_wqe_set_qos(work, priv->port & 0x7);
577 cvmx_wqe_set_grp(work, pow_send_group);
578 work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
579 work->word1.tag = pow_send_group; /* FIXME */
580 /* Default to zero. Sets of zero later are commented out */
581 work->word2.u64 = 0;
582 work->word2.s.bufs = 1;
583 work->packet_ptr.u64 = 0;
584 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
585 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
586 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
587 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
588
589 if (skb->protocol == htons(ETH_P_IP)) {
590 work->word2.s.ip_offset = 14;
591#if 0
592 work->word2.s.vlan_valid = 0; /* FIXME */
593 work->word2.s.vlan_cfi = 0; /* FIXME */
594 work->word2.s.vlan_id = 0; /* FIXME */
595 work->word2.s.dec_ipcomp = 0; /* FIXME */
596#endif
597 work->word2.s.tcp_or_udp =
598 (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
599 (ip_hdr(skb)->protocol == IPPROTO_UDP);
600#if 0
601 /* FIXME */
602 work->word2.s.dec_ipsec = 0;
603 /* We only support IPv4 right now */
604 work->word2.s.is_v6 = 0;
605 /* Hardware would set to zero */
606 work->word2.s.software = 0;
607 /* No error, packet is internal */
608 work->word2.s.L4_error = 0;
609#endif
610 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
611 (ip_hdr(skb)->frag_off ==
612 1 << 14));
613#if 0
614 /* Assume Linux is sending a good packet */
615 work->word2.s.IP_exc = 0;
616#endif
617 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
618 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
619#if 0
620 /* This is an IP packet */
621 work->word2.s.not_IP = 0;
622 /* No error, packet is internal */
623 work->word2.s.rcv_error = 0;
624 /* No error, packet is internal */
625 work->word2.s.err_code = 0;
626#endif
627
628 /*
629 * When copying the data, include 4 bytes of the
630 * ethernet header to align the same way hardware
631 * does.
632 */
633 memcpy(work->packet_data, skb->data + 10,
634 sizeof(work->packet_data));
635 } else {
636#if 0
637 work->word2.snoip.vlan_valid = 0; /* FIXME */
638 work->word2.snoip.vlan_cfi = 0; /* FIXME */
639 work->word2.snoip.vlan_id = 0; /* FIXME */
640 work->word2.snoip.software = 0; /* Hardware would set to zero */
641#endif
642 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
643 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
644 work->word2.snoip.is_bcast =
645 (skb->pkt_type == PACKET_BROADCAST);
646 work->word2.snoip.is_mcast =
647 (skb->pkt_type == PACKET_MULTICAST);
648 work->word2.snoip.not_IP = 1; /* IP was done up above */
649#if 0
650 /* No error, packet is internal */
651 work->word2.snoip.rcv_error = 0;
652 /* No error, packet is internal */
653 work->word2.snoip.err_code = 0;
654#endif
655 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
656 }
657
658 /* Submit the packet to the POW */
659 cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
660 cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
661 dev->stats.tx_packets++;
662 dev->stats.tx_bytes += skb->len;
663 dev_consume_skb_any(skb);
664 return 0;
665}
666
667/**
668 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
669 * @dev: Device being shutdown
670 *
671 */
672void cvm_oct_tx_shutdown_dev(struct net_device *dev)
673{
674 struct octeon_ethernet *priv = netdev_priv(dev);
675 unsigned long flags;
676 int qos;
677
678 for (qos = 0; qos < 16; qos++) {
679 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
680 while (skb_queue_len(&priv->tx_free_list[qos]))
681 dev_kfree_skb_any(__skb_dequeue
682 (&priv->tx_free_list[qos]));
683 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
684 }
685}
686
687static void cvm_oct_tx_do_cleanup(unsigned long arg)
688{
689 int port;
690
691 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
692 if (cvm_oct_device[port]) {
693 struct net_device *dev = cvm_oct_device[port];
694
695 cvm_oct_free_tx_skbs(dev);
696 }
697 }
698}
699
700static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
701{
702 /* Disable the interrupt. */
703 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
704 /* Do the work in the tasklet. */
705 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
706 return IRQ_HANDLED;
707}
708
709void cvm_oct_tx_initialize(void)
710{
711 int i;
712
713 /* Disable the interrupt. */
714 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
715 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
716 i = request_irq(OCTEON_IRQ_TIMER1,
717 cvm_oct_tx_cleanup_watchdog, 0,
718 "Ethernet", cvm_oct_device);
719
720 if (i)
721 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
722}
723
724void cvm_oct_tx_shutdown(void)
725{
726 /* Free the interrupt handler */
727 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
728}