ethernet-tx.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * This file is based on code from OCTEON SDK by Cavium Networks.
  4 *
  5 * Copyright (c) 2003-2010 Cavium Networks
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/kernel.h>
 10#include <linux/netdevice.h>
 11#include <linux/etherdevice.h>
 12#include <linux/ip.h>
 13#include <linux/ratelimit.h>
 14#include <linux/string.h>
 15#include <linux/interrupt.h>
 16#include <net/dst.h>
 17#ifdef CONFIG_XFRM
 18#include <linux/xfrm.h>
 19#include <net/xfrm.h>
 20#endif /* CONFIG_XFRM */
 21
 22#include <linux/atomic.h>
 23#include <net/sch_generic.h>
 24
 25#include "octeon-ethernet.h"
 26#include "ethernet-defines.h"
 27#include "ethernet-tx.h"
 28#include "ethernet-util.h"
 29
 30#define CVM_OCT_SKB_CB(skb)	((u64 *)((skb)->cb))
 31
 32/*
 33 * You can define GET_SKBUFF_QOS() to override how the skbuff output
 34 * function determines which output queue is used. The default
 35 * implementation always uses the base queue for the port. If, for
 36 * example, you wanted to use the skb->priority field, define
 37 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
 38 */
 39#ifndef GET_SKBUFF_QOS
 40#define GET_SKBUFF_QOS(skb) 0
 41#endif
 42
 43static void cvm_oct_tx_do_cleanup(struct tasklet_struct *clean);
 44static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup);
 45
 46/* Maximum number of SKBs to try to free per xmit packet. */
 47#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
 48
 49static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
 50{
 51	int undo;
 52
 53	undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
 54						   MAX_SKB_TO_FREE;
 55	if (undo > 0)
 56		cvmx_fau_atomic_add32(fau, -undo);
 57	skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
 58						       -skb_to_free;
 59	return skb_to_free;
 60}
 61
 62static void cvm_oct_kick_tx_poll_watchdog(void)
 63{
 64	union cvmx_ciu_timx ciu_timx;
 65
 66	ciu_timx.u64 = 0;
 67	ciu_timx.s.one_shot = 1;
 68	ciu_timx.s.len = cvm_oct_tx_poll_interval;
 69	cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
 70}
 71
 72static void cvm_oct_free_tx_skbs(struct net_device *dev)
 73{
 74	int skb_to_free;
 75	int qos, queues_per_port;
 76	int total_remaining = 0;
 77	unsigned long flags;
 78	struct octeon_ethernet *priv = netdev_priv(dev);
 79
 80	queues_per_port = cvmx_pko_get_num_queues(priv->port);
 81	/* Drain any pending packets in the free list */
 82	for (qos = 0; qos < queues_per_port; qos++) {
 83		if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
 84			continue;
 85		skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
 86						       MAX_SKB_TO_FREE);
 87		skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
 88							 priv->fau + qos * 4);
 89		if (skb_to_free > 0) {
 90			struct sk_buff *to_free_list = NULL;
 91
 92			spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
 93			while (skb_to_free > 0) {
 94				struct sk_buff *t;
 95
 96				t = __skb_dequeue(&priv->tx_free_list[qos]);
 97				t->next = to_free_list;
 98				to_free_list = t;
 99				skb_to_free--;
100			}
101			spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
102					       flags);
103			/* Do the actual freeing outside of the lock. */
104			while (to_free_list) {
105				struct sk_buff *t = to_free_list;
106
107				to_free_list = to_free_list->next;
108				dev_kfree_skb_any(t);
109			}
110		}
111		total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
112	}
113	if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
114		netif_wake_queue(dev);
115	if (total_remaining)
116		cvm_oct_kick_tx_poll_watchdog();
117}
118
119/**
120 * cvm_oct_xmit - transmit a packet
121 * @skb:    Packet to send
122 * @dev:    Device info structure
123 *
124 * Returns Always returns NETDEV_TX_OK
125 */
126netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
127{
128	union cvmx_pko_command_word0 pko_command;
129	union cvmx_buf_ptr hw_buffer;
130	u64 old_scratch;
131	u64 old_scratch2;
132	int qos;
133	int i;
134	enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
135	struct octeon_ethernet *priv = netdev_priv(dev);
136	struct sk_buff *to_free_list;
137	int skb_to_free;
138	int buffers_to_free;
139	u32 total_to_clean;
140	unsigned long flags;
141#if REUSE_SKBUFFS_WITHOUT_FREE
142	unsigned char *fpa_head;
143#endif
144
145	/*
146	 * Prefetch the private data structure.  It is larger than the
147	 * one cache line.
148	 */
149	prefetch(priv);
150
151	/*
152	 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
153	 * completely remove "qos" in the event neither interface
154	 * supports multiple queues per port.
155	 */
156	if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
157	    (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
158		qos = GET_SKBUFF_QOS(skb);
159		if (qos <= 0)
160			qos = 0;
161		else if (qos >= cvmx_pko_get_num_queues(priv->port))
162			qos = 0;
163	} else {
164		qos = 0;
165	}
166
167	if (USE_ASYNC_IOBDMA) {
168		/* Save scratch in case userspace is using it */
169		CVMX_SYNCIOBDMA;
170		old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
171		old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
172
173		/*
174		 * Fetch and increment the number of packets to be
175		 * freed.
176		 */
177		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
178					       FAU_NUM_PACKET_BUFFERS_TO_FREE,
179					       0);
180		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
181					       priv->fau + qos * 4,
182					       MAX_SKB_TO_FREE);
183	}
184
185	/*
186	 * We have space for 6 segment pointers, If there will be more
187	 * than that, we must linearize.
188	 */
189	if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
190		if (unlikely(__skb_linearize(skb))) {
191			queue_type = QUEUE_DROP;
192			if (USE_ASYNC_IOBDMA) {
193				/*
194				 * Get the number of skbuffs in use
195				 * by the hardware
196				 */
197				CVMX_SYNCIOBDMA;
198				skb_to_free =
199					cvmx_scratch_read64(CVMX_SCR_SCRATCH);
200			} else {
201				/*
202				 * Get the number of skbuffs in use
203				 * by the hardware
204				 */
205				skb_to_free =
206				     cvmx_fau_fetch_and_add32(priv->fau +
207							      qos * 4,
208							      MAX_SKB_TO_FREE);
209			}
210			skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
211								 priv->fau +
212								 qos * 4);
213			spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
214			goto skip_xmit;
215		}
216	}
217
218	/*
219	 * The CN3XXX series of parts has an errata (GMX-401) which
220	 * causes the GMX block to hang if a collision occurs towards
221	 * the end of a <68 byte packet. As a workaround for this, we
222	 * pad packets to be 68 bytes whenever we are in half duplex
223	 * mode. We don't handle the case of having a small packet but
224	 * no room to add the padding.  The kernel should always give
225	 * us at least a cache line
226	 */
227	if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
228		union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
229		int interface = INTERFACE(priv->port);
230		int index = INDEX(priv->port);
231
232		if (interface < 2) {
233			/* We only need to pad packet in half duplex mode */
234			gmx_prt_cfg.u64 =
235			    cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
236			if (gmx_prt_cfg.s.duplex == 0) {
237				int add_bytes = 64 - skb->len;
238
239				if ((skb_tail_pointer(skb) + add_bytes) <=
240				    skb_end_pointer(skb))
241					__skb_put_zero(skb, add_bytes);
242			}
243		}
244	}
245
246	/* Build the PKO command */
247	pko_command.u64 = 0;
248#ifdef __LITTLE_ENDIAN
249	pko_command.s.le = 1;
250#endif
251	pko_command.s.n2 = 1;	/* Don't pollute L2 with the outgoing packet */
252	pko_command.s.segs = 1;
253	pko_command.s.total_bytes = skb->len;
254	pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
255	pko_command.s.subone0 = 1;
256
257	pko_command.s.dontfree = 1;
258
259	/* Build the PKO buffer pointer */
260	hw_buffer.u64 = 0;
261	if (skb_shinfo(skb)->nr_frags == 0) {
262		hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
263		hw_buffer.s.pool = 0;
264		hw_buffer.s.size = skb->len;
265	} else {
266		hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
267		hw_buffer.s.pool = 0;
268		hw_buffer.s.size = skb_headlen(skb);
269		CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
270		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
271			skb_frag_t *fs = skb_shinfo(skb)->frags + i;
272
273			hw_buffer.s.addr =
274				XKPHYS_TO_PHYS((uintptr_t)skb_frag_address(fs));
275			hw_buffer.s.size = skb_frag_size(fs);
276			CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
277		}
278		hw_buffer.s.addr =
279			XKPHYS_TO_PHYS((uintptr_t)CVM_OCT_SKB_CB(skb));
280		hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
281		pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
282		pko_command.s.gather = 1;
283		goto dont_put_skbuff_in_hw;
284	}
285
286	/*
287	 * See if we can put this skb in the FPA pool. Any strange
288	 * behavior from the Linux networking stack will most likely
289	 * be caused by a bug in the following code. If some field is
290	 * in use by the network stack and gets carried over when a
291	 * buffer is reused, bad things may happen.  If in doubt and
292	 * you dont need the absolute best performance, disable the
293	 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
294	 * shown a 25% increase in performance under some loads.
295	 */
296#if REUSE_SKBUFFS_WITHOUT_FREE
297	fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
298	if (unlikely(skb->data < fpa_head)) {
299		/* TX buffer beginning can't meet FPA alignment constraints */
300		goto dont_put_skbuff_in_hw;
301	}
302	if (unlikely
303	    ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
304		/* TX buffer isn't large enough for the FPA */
305		goto dont_put_skbuff_in_hw;
306	}
307	if (unlikely(skb_shared(skb))) {
308		/* TX buffer sharing data with someone else */
309		goto dont_put_skbuff_in_hw;
310	}
311	if (unlikely(skb_cloned(skb))) {
312		/* TX buffer has been cloned */
313		goto dont_put_skbuff_in_hw;
314	}
315	if (unlikely(skb_header_cloned(skb))) {
316		/* TX buffer header has been cloned */
317		goto dont_put_skbuff_in_hw;
318	}
319	if (unlikely(skb->destructor)) {
320		/* TX buffer has a destructor */
321		goto dont_put_skbuff_in_hw;
322	}
323	if (unlikely(skb_shinfo(skb)->nr_frags)) {
324		/* TX buffer has fragments */
325		goto dont_put_skbuff_in_hw;
326	}
327	if (unlikely
328	    (skb->truesize !=
329	     sizeof(*skb) + skb_end_offset(skb))) {
330		/* TX buffer truesize has been changed */
331		goto dont_put_skbuff_in_hw;
332	}
333
334	/*
335	 * We can use this buffer in the FPA.  We don't need the FAU
336	 * update anymore
337	 */
338	pko_command.s.dontfree = 0;
339
340	hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
341			   ((unsigned long)fpa_head >> 7);
342
343	*(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
344
345	/*
346	 * The skbuff will be reused without ever being freed. We must
347	 * cleanup a bunch of core things.
348	 */
349	skb_dst_drop(skb);
350	skb_ext_reset(skb);
351	nf_reset_ct(skb);
352	skb_reset_redirect(skb);
353
354#ifdef CONFIG_NET_SCHED
355	skb->tc_index = 0;
356#endif /* CONFIG_NET_SCHED */
357#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
358
359dont_put_skbuff_in_hw:
360
361	/* Check if we can use the hardware checksumming */
362	if ((skb->protocol == htons(ETH_P_IP)) &&
363	    (ip_hdr(skb)->version == 4) &&
364	    (ip_hdr(skb)->ihl == 5) &&
365	    ((ip_hdr(skb)->frag_off == 0) ||
366	     (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
367	    ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
368	     (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
369		/* Use hardware checksum calc */
370		pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
371	}
372
373	if (USE_ASYNC_IOBDMA) {
374		/* Get the number of skbuffs in use by the hardware */
375		CVMX_SYNCIOBDMA;
376		skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
377		buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
378	} else {
379		/* Get the number of skbuffs in use by the hardware */
380		skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
381						       MAX_SKB_TO_FREE);
382		buffers_to_free =
383		    cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
384	}
385
386	skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
387						 priv->fau + qos * 4);
388
389	/*
390	 * If we're sending faster than the receive can free them then
391	 * don't do the HW free.
392	 */
393	if ((buffers_to_free < -100) && !pko_command.s.dontfree)
394		pko_command.s.dontfree = 1;
395
396	if (pko_command.s.dontfree) {
397		queue_type = QUEUE_CORE;
398		pko_command.s.reg0 = priv->fau + qos * 4;
399	} else {
400		queue_type = QUEUE_HW;
401	}
402	if (USE_ASYNC_IOBDMA)
403		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
404					       FAU_TOTAL_TX_TO_CLEAN, 1);
405
406	spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
407
408	/* Drop this packet if we have too many already queued to the HW */
409	if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
410		     MAX_OUT_QUEUE_DEPTH)) {
411		if (dev->tx_queue_len != 0) {
412			/* Drop the lock when notifying the core.  */
413			spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
414					       flags);
415			netif_stop_queue(dev);
416			spin_lock_irqsave(&priv->tx_free_list[qos].lock,
417					  flags);
418		} else {
419			/* If not using normal queueing.  */
420			queue_type = QUEUE_DROP;
421			goto skip_xmit;
422		}
423	}
424
425	cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
426				     CVMX_PKO_LOCK_NONE);
427
428	/* Send the packet to the output queue */
429	if (unlikely(cvmx_pko_send_packet_finish(priv->port,
430						 priv->queue + qos,
431						 pko_command, hw_buffer,
432						 CVMX_PKO_LOCK_NONE))) {
433		printk_ratelimited("%s: Failed to send the packet\n",
434				   dev->name);
435		queue_type = QUEUE_DROP;
436	}
437skip_xmit:
438	to_free_list = NULL;
439
440	switch (queue_type) {
441	case QUEUE_DROP:
442		skb->next = to_free_list;
443		to_free_list = skb;
444		dev->stats.tx_dropped++;
445		break;
446	case QUEUE_HW:
447		cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
448		break;
449	case QUEUE_CORE:
450		__skb_queue_tail(&priv->tx_free_list[qos], skb);
451		break;
452	default:
453		BUG();
454	}
455
456	while (skb_to_free > 0) {
457		struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
458
459		t->next = to_free_list;
460		to_free_list = t;
461		skb_to_free--;
462	}
463
464	spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
465
466	/* Do the actual freeing outside of the lock. */
467	while (to_free_list) {
468		struct sk_buff *t = to_free_list;
469
470		to_free_list = to_free_list->next;
471		dev_kfree_skb_any(t);
472	}
473
474	if (USE_ASYNC_IOBDMA) {
475		CVMX_SYNCIOBDMA;
476		total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
477		/* Restore the scratch area */
478		cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
479		cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
480	} else {
481		total_to_clean =
482			cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
483	}
484
485	if (total_to_clean & 0x3ff) {
486		/*
487		 * Schedule the cleanup tasklet every 1024 packets for
488		 * the pathological case of high traffic on one port
489		 * delaying clean up of packets on a different port
490		 * that is blocked waiting for the cleanup.
491		 */
492		tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
493	}
494
495	cvm_oct_kick_tx_poll_watchdog();
496
497	return NETDEV_TX_OK;
498}
499
500/**
501 * cvm_oct_xmit_pow - transmit a packet to the POW
502 * @skb:    Packet to send
503 * @dev:    Device info structure
504 * Returns Always returns zero
505 */
506netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
507{
508	struct octeon_ethernet *priv = netdev_priv(dev);
509	void *packet_buffer;
510	void *copy_location;
511
512	/* Get a work queue entry */
513	struct cvmx_wqe *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
514
515	if (unlikely(!work)) {
516		printk_ratelimited("%s: Failed to allocate a work queue entry\n",
517				   dev->name);
518		dev->stats.tx_dropped++;
519		dev_kfree_skb_any(skb);
520		return 0;
521	}
522
523	/* Get a packet buffer */
524	packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
525	if (unlikely(!packet_buffer)) {
526		printk_ratelimited("%s: Failed to allocate a packet buffer\n",
527				   dev->name);
528		cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
529		dev->stats.tx_dropped++;
530		dev_kfree_skb_any(skb);
531		return 0;
532	}
533
534	/*
535	 * Calculate where we need to copy the data to. We need to
536	 * leave 8 bytes for a next pointer (unused). We also need to
537	 * include any configure skip. Then we need to align the IP
538	 * packet src and dest into the same 64bit word. The below
539	 * calculation may add a little extra, but that doesn't
540	 * hurt.
541	 */
542	copy_location = packet_buffer + sizeof(u64);
543	copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
544
545	/*
546	 * We have to copy the packet since whoever processes this
547	 * packet will free it to a hardware pool. We can't use the
548	 * trick of counting outstanding packets like in
549	 * cvm_oct_xmit.
550	 */
551	memcpy(copy_location, skb->data, skb->len);
552
553	/*
554	 * Fill in some of the work queue fields. We may need to add
555	 * more if the software at the other end needs them.
556	 */
557	if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
558		work->word0.pip.cn38xx.hw_chksum = skb->csum;
559	work->word1.len = skb->len;
560	cvmx_wqe_set_port(work, priv->port);
561	cvmx_wqe_set_qos(work, priv->port & 0x7);
562	cvmx_wqe_set_grp(work, pow_send_group);
563	work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
564	work->word1.tag = pow_send_group;	/* FIXME */
565	/* Default to zero. Sets of zero later are commented out */
566	work->word2.u64 = 0;
567	work->word2.s.bufs = 1;
568	work->packet_ptr.u64 = 0;
569	work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
570	work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
571	work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
572	work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
573
574	if (skb->protocol == htons(ETH_P_IP)) {
575		work->word2.s.ip_offset = 14;
576		work->word2.s.tcp_or_udp =
577		    (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
578		    (ip_hdr(skb)->protocol == IPPROTO_UDP);
579		work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
580					  (ip_hdr(skb)->frag_off ==
581					      cpu_to_be16(1 << 14)));
582		work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
583		work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
584
585		/*
586		 * When copying the data, include 4 bytes of the
587		 * ethernet header to align the same way hardware
588		 * does.
589		 */
590		memcpy(work->packet_data, skb->data + 10,
591		       sizeof(work->packet_data));
592	} else {
593		work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
594		work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
595		work->word2.snoip.is_bcast =
596		    (skb->pkt_type == PACKET_BROADCAST);
597		work->word2.snoip.is_mcast =
598		    (skb->pkt_type == PACKET_MULTICAST);
599		work->word2.snoip.not_IP = 1;	/* IP was done up above */
600		memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
601	}
602
603	/* Submit the packet to the POW */
604	cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
605			     cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
606	dev->stats.tx_packets++;
607	dev->stats.tx_bytes += skb->len;
608	dev_consume_skb_any(skb);
609	return 0;
610}
611
612/**
613 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
614 * @dev:    Device being shutdown
615 *
616 */
617void cvm_oct_tx_shutdown_dev(struct net_device *dev)
618{
619	struct octeon_ethernet *priv = netdev_priv(dev);
620	unsigned long flags;
621	int qos;
622
623	for (qos = 0; qos < 16; qos++) {
624		spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
625		while (skb_queue_len(&priv->tx_free_list[qos]))
626			dev_kfree_skb_any(__skb_dequeue
627					  (&priv->tx_free_list[qos]));
628		spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
629	}
630}
631
632static void cvm_oct_tx_do_cleanup(struct tasklet_struct *clean)
633{
634	int port;
635
636	for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
637		if (cvm_oct_device[port]) {
638			struct net_device *dev = cvm_oct_device[port];
639
640			cvm_oct_free_tx_skbs(dev);
641		}
642	}
643}
644
645static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
646{
647	/* Disable the interrupt.  */
648	cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
649	/* Do the work in the tasklet.  */
650	tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
651	return IRQ_HANDLED;
652}
653
654void cvm_oct_tx_initialize(void)
655{
656	int i;
657
658	/* Disable the interrupt.  */
659	cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
660	/* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
661	i = request_irq(OCTEON_IRQ_TIMER1,
662			cvm_oct_tx_cleanup_watchdog, 0,
663			"Ethernet", cvm_oct_device);
664
665	if (i)
666		panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
667}
668
669void cvm_oct_tx_shutdown(void)
670{
671	/* Free the interrupt handler */
672	free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
673}