PageRenderTime 34ms CodeModel.GetById 12ms app.highlight 18ms RepoModel.GetById 0ms app.codeStats 0ms

/drivers/staging/octeon/ethernet-tx.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 724 lines | 465 code | 67 blank | 192 comment | 91 complexity | e092ad9e41900ee310296b93e31807aa MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  1/*********************************************************************
  2 * Author: Cavium Networks
  3 *
  4 * Contact: support@caviumnetworks.com
  5 * This file is part of the OCTEON SDK
  6 *
  7 * Copyright (c) 2003-2010 Cavium Networks
  8 *
  9 * This file is free software; you can redistribute it and/or modify
 10 * it under the terms of the GNU General Public License, Version 2, as
 11 * published by the Free Software Foundation.
 12 *
 13 * This file is distributed in the hope that it will be useful, but
 14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
 15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 16 * NONINFRINGEMENT.  See the GNU General Public License for more
 17 * details.
 18 *
 19 * You should have received a copy of the GNU General Public License
 20 * along with this file; if not, write to the Free Software
 21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 22 * or visit http://www.gnu.org/licenses/.
 23 *
 24 * This file may also be available under a different license from Cavium.
 25 * Contact Cavium Networks for more information
 26*********************************************************************/
 27#include <linux/module.h>
 28#include <linux/kernel.h>
 29#include <linux/netdevice.h>
 30#include <linux/init.h>
 31#include <linux/etherdevice.h>
 32#include <linux/ip.h>
 33#include <linux/ratelimit.h>
 34#include <linux/string.h>
 35#include <net/dst.h>
 36#ifdef CONFIG_XFRM
 37#include <linux/xfrm.h>
 38#include <net/xfrm.h>
 39#endif /* CONFIG_XFRM */
 40
 41#include <linux/atomic.h>
 42
 43#include <asm/octeon/octeon.h>
 44
 45#include "ethernet-defines.h"
 46#include "octeon-ethernet.h"
 47#include "ethernet-tx.h"
 48#include "ethernet-util.h"
 49
 50#include "cvmx-wqe.h"
 51#include "cvmx-fau.h"
 52#include "cvmx-pip.h"
 53#include "cvmx-pko.h"
 54#include "cvmx-helper.h"
 55
 56#include "cvmx-gmxx-defs.h"
 57
 58#define CVM_OCT_SKB_CB(skb)	((u64 *)((skb)->cb))
 59
 60/*
 61 * You can define GET_SKBUFF_QOS() to override how the skbuff output
 62 * function determines which output queue is used. The default
 63 * implementation always uses the base queue for the port. If, for
 64 * example, you wanted to use the skb->priority fieid, define
 65 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
 66 */
 67#ifndef GET_SKBUFF_QOS
 68#define GET_SKBUFF_QOS(skb) 0
 69#endif
 70
 71static void cvm_oct_tx_do_cleanup(unsigned long arg);
 72static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
 73
 74/* Maximum number of SKBs to try to free per xmit packet. */
 75#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
 76
 77static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau)
 78{
 79	int32_t undo;
 80	undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE;
 81	if (undo > 0)
 82		cvmx_fau_atomic_add32(fau, -undo);
 83	skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : -skb_to_free;
 84	return skb_to_free;
 85}
 86
 87static void cvm_oct_kick_tx_poll_watchdog(void)
 88{
 89	union cvmx_ciu_timx ciu_timx;
 90	ciu_timx.u64 = 0;
 91	ciu_timx.s.one_shot = 1;
 92	ciu_timx.s.len = cvm_oct_tx_poll_interval;
 93	cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
 94}
 95
 96void cvm_oct_free_tx_skbs(struct net_device *dev)
 97{
 98	int32_t skb_to_free;
 99	int qos, queues_per_port;
100	int total_freed = 0;
101	int total_remaining = 0;
102	unsigned long flags;
103	struct octeon_ethernet *priv = netdev_priv(dev);
104
105	queues_per_port = cvmx_pko_get_num_queues(priv->port);
106	/* Drain any pending packets in the free list */
107	for (qos = 0; qos < queues_per_port; qos++) {
108		if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
109			continue;
110		skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4, MAX_SKB_TO_FREE);
111		skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
112
113
114		total_freed += skb_to_free;
115		if (skb_to_free > 0) {
116			struct sk_buff *to_free_list = NULL;
117			spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
118			while (skb_to_free > 0) {
119				struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
120				t->next = to_free_list;
121				to_free_list = t;
122				skb_to_free--;
123			}
124			spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
125			/* Do the actual freeing outside of the lock. */
126			while (to_free_list) {
127				struct sk_buff *t = to_free_list;
128				to_free_list = to_free_list->next;
129				dev_kfree_skb_any(t);
130			}
131		}
132		total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
133	}
134	if (total_freed >= 0 && netif_queue_stopped(dev))
135		netif_wake_queue(dev);
136	if (total_remaining)
137		cvm_oct_kick_tx_poll_watchdog();
138}
139
140/**
141 * cvm_oct_xmit - transmit a packet
142 * @skb:    Packet to send
143 * @dev:    Device info structure
144 *
145 * Returns Always returns NETDEV_TX_OK
146 */
147int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
148{
149	cvmx_pko_command_word0_t pko_command;
150	union cvmx_buf_ptr hw_buffer;
151	uint64_t old_scratch;
152	uint64_t old_scratch2;
153	int qos;
154	int i;
155	enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
156	struct octeon_ethernet *priv = netdev_priv(dev);
157	struct sk_buff *to_free_list;
158	int32_t skb_to_free;
159	int32_t buffers_to_free;
160	u32 total_to_clean;
161	unsigned long flags;
162#if REUSE_SKBUFFS_WITHOUT_FREE
163	unsigned char *fpa_head;
164#endif
165
166	/*
167	 * Prefetch the private data structure.  It is larger that one
168	 * cache line.
169	 */
170	prefetch(priv);
171
172	/*
173	 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
174	 * completely remove "qos" in the event neither interface
175	 * supports multiple queues per port.
176	 */
177	if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
178	    (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
179		qos = GET_SKBUFF_QOS(skb);
180		if (qos <= 0)
181			qos = 0;
182		else if (qos >= cvmx_pko_get_num_queues(priv->port))
183			qos = 0;
184	} else
185		qos = 0;
186
187	if (USE_ASYNC_IOBDMA) {
188		/* Save scratch in case userspace is using it */
189		CVMX_SYNCIOBDMA;
190		old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
191		old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
192
193		/*
194		 * Fetch and increment the number of packets to be
195		 * freed.
196		 */
197		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
198					       FAU_NUM_PACKET_BUFFERS_TO_FREE,
199					       0);
200		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
201					       priv->fau + qos * 4,
202					       MAX_SKB_TO_FREE);
203	}
204
205	/*
206	 * We have space for 6 segment pointers, If there will be more
207	 * than that, we must linearize.
208	 */
209	if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
210		if (unlikely(__skb_linearize(skb))) {
211			queue_type = QUEUE_DROP;
212			if (USE_ASYNC_IOBDMA) {
213				/* Get the number of skbuffs in use by the hardware */
214				CVMX_SYNCIOBDMA;
215				skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
216			} else {
217				/* Get the number of skbuffs in use by the hardware */
218				skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
219								       MAX_SKB_TO_FREE);
220			}
221			skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau + qos * 4);
222			spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
223			goto skip_xmit;
224		}
225	}
226
227	/*
228	 * The CN3XXX series of parts has an errata (GMX-401) which
229	 * causes the GMX block to hang if a collision occurs towards
230	 * the end of a <68 byte packet. As a workaround for this, we
231	 * pad packets to be 68 bytes whenever we are in half duplex
232	 * mode. We don't handle the case of having a small packet but
233	 * no room to add the padding.  The kernel should always give
234	 * us at least a cache line
235	 */
236	if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
237		union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
238		int interface = INTERFACE(priv->port);
239		int index = INDEX(priv->port);
240
241		if (interface < 2) {
242			/* We only need to pad packet in half duplex mode */
243			gmx_prt_cfg.u64 =
244			    cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
245			if (gmx_prt_cfg.s.duplex == 0) {
246				int add_bytes = 64 - skb->len;
247				if ((skb_tail_pointer(skb) + add_bytes) <=
248				    skb_end_pointer(skb))
249					memset(__skb_put(skb, add_bytes), 0,
250					       add_bytes);
251			}
252		}
253	}
254
255	/* Build the PKO command */
256	pko_command.u64 = 0;
257	pko_command.s.n2 = 1;	/* Don't pollute L2 with the outgoing packet */
258	pko_command.s.segs = 1;
259	pko_command.s.total_bytes = skb->len;
260	pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
261	pko_command.s.subone0 = 1;
262
263	pko_command.s.dontfree = 1;
264
265	/* Build the PKO buffer pointer */
266	hw_buffer.u64 = 0;
267	if (skb_shinfo(skb)->nr_frags == 0) {
268		hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
269		hw_buffer.s.pool = 0;
270		hw_buffer.s.size = skb->len;
271	} else {
272		hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
273		hw_buffer.s.pool = 0;
274		hw_buffer.s.size = skb_headlen(skb);
275		CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
276		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
277			struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i;
278			hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)(page_address(fs->page) + fs->page_offset));
279			hw_buffer.s.size = fs->size;
280			CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
281		}
282		hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
283		hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
284		pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
285		pko_command.s.gather = 1;
286		goto dont_put_skbuff_in_hw;
287	}
288
289	/*
290	 * See if we can put this skb in the FPA pool. Any strange
291	 * behavior from the Linux networking stack will most likely
292	 * be caused by a bug in the following code. If some field is
293	 * in use by the network stack and get carried over when a
294	 * buffer is reused, bad thing may happen.  If in doubt and
295	 * you dont need the absolute best performance, disable the
296	 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
297	 * shown a 25% increase in performance under some loads.
298	 */
299#if REUSE_SKBUFFS_WITHOUT_FREE
300	fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
301	if (unlikely(skb->data < fpa_head)) {
302		/*
303		 * printk("TX buffer beginning can't meet FPA
304		 * alignment constraints\n");
305		 */
306		goto dont_put_skbuff_in_hw;
307	}
308	if (unlikely
309	    ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
310		/*
311		   printk("TX buffer isn't large enough for the FPA\n");
312		 */
313		goto dont_put_skbuff_in_hw;
314	}
315	if (unlikely(skb_shared(skb))) {
316		/*
317		   printk("TX buffer sharing data with someone else\n");
318		 */
319		goto dont_put_skbuff_in_hw;
320	}
321	if (unlikely(skb_cloned(skb))) {
322		/*
323		   printk("TX buffer has been cloned\n");
324		 */
325		goto dont_put_skbuff_in_hw;
326	}
327	if (unlikely(skb_header_cloned(skb))) {
328		/*
329		   printk("TX buffer header has been cloned\n");
330		 */
331		goto dont_put_skbuff_in_hw;
332	}
333	if (unlikely(skb->destructor)) {
334		/*
335		   printk("TX buffer has a destructor\n");
336		 */
337		goto dont_put_skbuff_in_hw;
338	}
339	if (unlikely(skb_shinfo(skb)->nr_frags)) {
340		/*
341		   printk("TX buffer has fragments\n");
342		 */
343		goto dont_put_skbuff_in_hw;
344	}
345	if (unlikely
346	    (skb->truesize !=
347	     sizeof(*skb) + skb_end_pointer(skb) - skb->head)) {
348		/*
349		   printk("TX buffer truesize has been changed\n");
350		 */
351		goto dont_put_skbuff_in_hw;
352	}
353
354	/*
355	 * We can use this buffer in the FPA.  We don't need the FAU
356	 * update anymore
357	 */
358	pko_command.s.dontfree = 0;
359
360	hw_buffer.s.back = ((unsigned long)skb->data >> 7) - ((unsigned long)fpa_head >> 7);
361	*(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
362
363	/*
364	 * The skbuff will be reused without ever being freed. We must
365	 * cleanup a bunch of core things.
366	 */
367	dst_release(skb_dst(skb));
368	skb_dst_set(skb, NULL);
369#ifdef CONFIG_XFRM
370	secpath_put(skb->sp);
371	skb->sp = NULL;
372#endif
373	nf_reset(skb);
374
375#ifdef CONFIG_NET_SCHED
376	skb->tc_index = 0;
377#ifdef CONFIG_NET_CLS_ACT
378	skb->tc_verd = 0;
379#endif /* CONFIG_NET_CLS_ACT */
380#endif /* CONFIG_NET_SCHED */
381#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
382
383dont_put_skbuff_in_hw:
384
385	/* Check if we can use the hardware checksumming */
386	if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) &&
387	    (ip_hdr(skb)->version == 4) && (ip_hdr(skb)->ihl == 5) &&
388	    ((ip_hdr(skb)->frag_off == 0) || (ip_hdr(skb)->frag_off == 1 << 14))
389	    && ((ip_hdr(skb)->protocol == IPPROTO_TCP)
390		|| (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
391		/* Use hardware checksum calc */
392		pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1;
393	}
394
395	if (USE_ASYNC_IOBDMA) {
396		/* Get the number of skbuffs in use by the hardware */
397		CVMX_SYNCIOBDMA;
398		skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
399		buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
400	} else {
401		/* Get the number of skbuffs in use by the hardware */
402		skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
403						       MAX_SKB_TO_FREE);
404		buffers_to_free =
405		    cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
406	}
407
408	skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
409
410	/*
411	 * If we're sending faster than the receive can free them then
412	 * don't do the HW free.
413	 */
414	if ((buffers_to_free < -100) && !pko_command.s.dontfree)
415		pko_command.s.dontfree = 1;
416
417	if (pko_command.s.dontfree) {
418		queue_type = QUEUE_CORE;
419		pko_command.s.reg0 = priv->fau+qos*4;
420	} else {
421		queue_type = QUEUE_HW;
422	}
423	if (USE_ASYNC_IOBDMA)
424		cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
425
426	spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
427
428	/* Drop this packet if we have too many already queued to the HW */
429	if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= MAX_OUT_QUEUE_DEPTH)) {
430		if (dev->tx_queue_len != 0) {
431			/* Drop the lock when notifying the core.  */
432			spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
433			netif_stop_queue(dev);
434			spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
435		} else {
436			/* If not using normal queueing.  */
437			queue_type = QUEUE_DROP;
438			goto skip_xmit;
439		}
440	}
441
442	cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
443				     CVMX_PKO_LOCK_NONE);
444
445	/* Send the packet to the output queue */
446	if (unlikely(cvmx_pko_send_packet_finish(priv->port,
447						 priv->queue + qos,
448						 pko_command, hw_buffer,
449						 CVMX_PKO_LOCK_NONE))) {
450		printk_ratelimited("%s: Failed to send the packet\n", dev->name);
451		queue_type = QUEUE_DROP;
452	}
453skip_xmit:
454	to_free_list = NULL;
455
456	switch (queue_type) {
457	case QUEUE_DROP:
458		skb->next = to_free_list;
459		to_free_list = skb;
460		priv->stats.tx_dropped++;
461		break;
462	case QUEUE_HW:
463		cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
464		break;
465	case QUEUE_CORE:
466		__skb_queue_tail(&priv->tx_free_list[qos], skb);
467		break;
468	default:
469		BUG();
470	}
471
472	while (skb_to_free > 0) {
473		struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
474		t->next = to_free_list;
475		to_free_list = t;
476		skb_to_free--;
477	}
478
479	spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
480
481	/* Do the actual freeing outside of the lock. */
482	while (to_free_list) {
483		struct sk_buff *t = to_free_list;
484		to_free_list = to_free_list->next;
485		dev_kfree_skb_any(t);
486	}
487
488	if (USE_ASYNC_IOBDMA) {
489		CVMX_SYNCIOBDMA;
490		total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
491		/* Restore the scratch area */
492		cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
493		cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
494	} else {
495		total_to_clean = cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
496	}
497
498	if (total_to_clean & 0x3ff) {
499		/*
500		 * Schedule the cleanup tasklet every 1024 packets for
501		 * the pathological case of high traffic on one port
502		 * delaying clean up of packets on a different port
503		 * that is blocked waiting for the cleanup.
504		 */
505		tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
506	}
507
508	cvm_oct_kick_tx_poll_watchdog();
509
510	return NETDEV_TX_OK;
511}
512
513/**
514 * cvm_oct_xmit_pow - transmit a packet to the POW
515 * @skb:    Packet to send
516 * @dev:    Device info structure
517
518 * Returns Always returns zero
519 */
520int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
521{
522	struct octeon_ethernet *priv = netdev_priv(dev);
523	void *packet_buffer;
524	void *copy_location;
525
526	/* Get a work queue entry */
527	cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
528	if (unlikely(work == NULL)) {
529		printk_ratelimited("%s: Failed to allocate a work "
530				   "queue entry\n", dev->name);
531		priv->stats.tx_dropped++;
532		dev_kfree_skb(skb);
533		return 0;
534	}
535
536	/* Get a packet buffer */
537	packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
538	if (unlikely(packet_buffer == NULL)) {
539		printk_ratelimited("%s: Failed to allocate a packet buffer\n",
540				   dev->name);
541		cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1));
542		priv->stats.tx_dropped++;
543		dev_kfree_skb(skb);
544		return 0;
545	}
546
547	/*
548	 * Calculate where we need to copy the data to. We need to
549	 * leave 8 bytes for a next pointer (unused). We also need to
550	 * include any configure skip. Then we need to align the IP
551	 * packet src and dest into the same 64bit word. The below
552	 * calculation may add a little extra, but that doesn't
553	 * hurt.
554	 */
555	copy_location = packet_buffer + sizeof(uint64_t);
556	copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
557
558	/*
559	 * We have to copy the packet since whoever processes this
560	 * packet will free it to a hardware pool. We can't use the
561	 * trick of counting outstanding packets like in
562	 * cvm_oct_xmit.
563	 */
564	memcpy(copy_location, skb->data, skb->len);
565
566	/*
567	 * Fill in some of the work queue fields. We may need to add
568	 * more if the software at the other end needs them.
569	 */
570	work->hw_chksum = skb->csum;
571	work->len = skb->len;
572	work->ipprt = priv->port;
573	work->qos = priv->port & 0x7;
574	work->grp = pow_send_group;
575	work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
576	work->tag = pow_send_group;	/* FIXME */
577	/* Default to zero. Sets of zero later are commented out */
578	work->word2.u64 = 0;
579	work->word2.s.bufs = 1;
580	work->packet_ptr.u64 = 0;
581	work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
582	work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
583	work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
584	work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
585
586	if (skb->protocol == htons(ETH_P_IP)) {
587		work->word2.s.ip_offset = 14;
588#if 0
589		work->word2.s.vlan_valid = 0;	/* FIXME */
590		work->word2.s.vlan_cfi = 0;	/* FIXME */
591		work->word2.s.vlan_id = 0;	/* FIXME */
592		work->word2.s.dec_ipcomp = 0;	/* FIXME */
593#endif
594		work->word2.s.tcp_or_udp =
595		    (ip_hdr(skb)->protocol == IPPROTO_TCP)
596		    || (ip_hdr(skb)->protocol == IPPROTO_UDP);
597#if 0
598		/* FIXME */
599		work->word2.s.dec_ipsec = 0;
600		/* We only support IPv4 right now */
601		work->word2.s.is_v6 = 0;
602		/* Hardware would set to zero */
603		work->word2.s.software = 0;
604		/* No error, packet is internal */
605		work->word2.s.L4_error = 0;
606#endif
607		work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0)
608					  || (ip_hdr(skb)->frag_off ==
609					      1 << 14));
610#if 0
611		/* Assume Linux is sending a good packet */
612		work->word2.s.IP_exc = 0;
613#endif
614		work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
615		work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
616#if 0
617		/* This is an IP packet */
618		work->word2.s.not_IP = 0;
619		/* No error, packet is internal */
620		work->word2.s.rcv_error = 0;
621		/* No error, packet is internal */
622		work->word2.s.err_code = 0;
623#endif
624
625		/*
626		 * When copying the data, include 4 bytes of the
627		 * ethernet header to align the same way hardware
628		 * does.
629		 */
630		memcpy(work->packet_data, skb->data + 10,
631		       sizeof(work->packet_data));
632	} else {
633#if 0
634		work->word2.snoip.vlan_valid = 0;	/* FIXME */
635		work->word2.snoip.vlan_cfi = 0;	/* FIXME */
636		work->word2.snoip.vlan_id = 0;	/* FIXME */
637		work->word2.snoip.software = 0;	/* Hardware would set to zero */
638#endif
639		work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
640		work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
641		work->word2.snoip.is_bcast =
642		    (skb->pkt_type == PACKET_BROADCAST);
643		work->word2.snoip.is_mcast =
644		    (skb->pkt_type == PACKET_MULTICAST);
645		work->word2.snoip.not_IP = 1;	/* IP was done up above */
646#if 0
647		/* No error, packet is internal */
648		work->word2.snoip.rcv_error = 0;
649		/* No error, packet is internal */
650		work->word2.snoip.err_code = 0;
651#endif
652		memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
653	}
654
655	/* Submit the packet to the POW */
656	cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos,
657			     work->grp);
658	priv->stats.tx_packets++;
659	priv->stats.tx_bytes += skb->len;
660	dev_kfree_skb(skb);
661	return 0;
662}
663
664/**
665 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
666 * @dev:    Device being shutdown
667 *
668 */
669void cvm_oct_tx_shutdown_dev(struct net_device *dev)
670{
671	struct octeon_ethernet *priv = netdev_priv(dev);
672	unsigned long flags;
673	int qos;
674
675	for (qos = 0; qos < 16; qos++) {
676		spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
677		while (skb_queue_len(&priv->tx_free_list[qos]))
678			dev_kfree_skb_any(__skb_dequeue
679					  (&priv->tx_free_list[qos]));
680		spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
681	}
682}
683
684static void cvm_oct_tx_do_cleanup(unsigned long arg)
685{
686	int port;
687
688	for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
689		if (cvm_oct_device[port]) {
690			struct net_device *dev = cvm_oct_device[port];
691			cvm_oct_free_tx_skbs(dev);
692		}
693	}
694}
695
696static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
697{
698	/* Disable the interrupt.  */
699	cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
700	/* Do the work in the tasklet.  */
701	tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
702	return IRQ_HANDLED;
703}
704
705void cvm_oct_tx_initialize(void)
706{
707	int i;
708
709	/* Disable the interrupt.  */
710	cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
711	/* Register an IRQ hander for to receive CIU_TIMX(1) interrupts */
712	i = request_irq(OCTEON_IRQ_TIMER1,
713			cvm_oct_tx_cleanup_watchdog, 0,
714			"Ethernet", cvm_oct_device);
715
716	if (i)
717		panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
718}
719
720void cvm_oct_tx_shutdown(void)
721{
722	/* Free the interrupt handler */
723	free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
724}