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 | |
43 | static void cvm_oct_tx_do_cleanup(unsigned long arg); |
44 | static DECLARE_TASKLET_OLD(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 | |
49 | static 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(reg: fau, value: -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 | |
62 | static 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), val: ciu_timx.u64); |
70 | } |
71 | |
72 | static 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(port: 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(list_: &priv->tx_free_list[qos]) == 0) |
84 | continue; |
85 | skb_to_free = cvmx_fau_fetch_and_add32(reg: priv->fau + qos * 4, |
86 | MAX_SKB_TO_FREE); |
87 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, |
88 | fau: 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(list: &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(lock: &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(skb: t); |
109 | } |
110 | } |
111 | total_remaining += skb_queue_len(list_: &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 | */ |
126 | netdev_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(port: 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 | value: 0); |
180 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, |
181 | reg: 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(reg: 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 | fau: 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(ipd_port: priv->port); |
230 | int index = INDEX(ipd_port: 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, len: 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(frag: 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 | dst_release(skb_dst(skb)); |
350 | skb_dst_set(skb, NULL); |
351 | skb_ext_reset(skb); |
352 | nf_reset_ct(skb); |
353 | skb_reset_redirect(skb); |
354 | |
355 | #ifdef CONFIG_NET_SCHED |
356 | skb->tc_index = 0; |
357 | #endif /* CONFIG_NET_SCHED */ |
358 | #endif /* REUSE_SKBUFFS_WITHOUT_FREE */ |
359 | |
360 | dont_put_skbuff_in_hw: |
361 | |
362 | /* Check if we can use the hardware checksumming */ |
363 | if ((skb->protocol == htons(ETH_P_IP)) && |
364 | (ip_hdr(skb)->version == 4) && |
365 | (ip_hdr(skb)->ihl == 5) && |
366 | ((ip_hdr(skb)->frag_off == 0) || |
367 | (ip_hdr(skb)->frag_off == htons(1 << 14))) && |
368 | ((ip_hdr(skb)->protocol == IPPROTO_TCP) || |
369 | (ip_hdr(skb)->protocol == IPPROTO_UDP))) { |
370 | /* Use hardware checksum calc */ |
371 | pko_command.s.ipoffp1 = skb_network_offset(skb) + 1; |
372 | } |
373 | |
374 | if (USE_ASYNC_IOBDMA) { |
375 | /* Get the number of skbuffs in use by the hardware */ |
376 | CVMX_SYNCIOBDMA; |
377 | skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH); |
378 | buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); |
379 | } else { |
380 | /* Get the number of skbuffs in use by the hardware */ |
381 | skb_to_free = cvmx_fau_fetch_and_add32(reg: priv->fau + qos * 4, |
382 | MAX_SKB_TO_FREE); |
383 | buffers_to_free = |
384 | cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, value: 0); |
385 | } |
386 | |
387 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, |
388 | fau: priv->fau + qos * 4); |
389 | |
390 | /* |
391 | * If we're sending faster than the receive can free them then |
392 | * don't do the HW free. |
393 | */ |
394 | if ((buffers_to_free < -100) && !pko_command.s.dontfree) |
395 | pko_command.s.dontfree = 1; |
396 | |
397 | if (pko_command.s.dontfree) { |
398 | queue_type = QUEUE_CORE; |
399 | pko_command.s.reg0 = priv->fau + qos * 4; |
400 | } else { |
401 | queue_type = QUEUE_HW; |
402 | } |
403 | if (USE_ASYNC_IOBDMA) |
404 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, |
405 | FAU_TOTAL_TX_TO_CLEAN, value: 1); |
406 | |
407 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
408 | |
409 | /* Drop this packet if we have too many already queued to the HW */ |
410 | if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= |
411 | MAX_OUT_QUEUE_DEPTH)) { |
412 | if (dev->tx_queue_len != 0) { |
413 | /* Drop the lock when notifying the core. */ |
414 | spin_unlock_irqrestore(lock: &priv->tx_free_list[qos].lock, |
415 | flags); |
416 | netif_stop_queue(dev); |
417 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, |
418 | flags); |
419 | } else { |
420 | /* If not using normal queueing. */ |
421 | queue_type = QUEUE_DROP; |
422 | goto skip_xmit; |
423 | } |
424 | } |
425 | |
426 | cvmx_pko_send_packet_prepare(port: priv->port, queue: priv->queue + qos, |
427 | use_locking: CVMX_PKO_LOCK_NONE); |
428 | |
429 | /* Send the packet to the output queue */ |
430 | if (unlikely(cvmx_pko_send_packet_finish(priv->port, |
431 | priv->queue + qos, |
432 | pko_command, hw_buffer, |
433 | CVMX_PKO_LOCK_NONE))) { |
434 | printk_ratelimited("%s: Failed to send the packet\n" , |
435 | dev->name); |
436 | queue_type = QUEUE_DROP; |
437 | } |
438 | skip_xmit: |
439 | to_free_list = NULL; |
440 | |
441 | switch (queue_type) { |
442 | case QUEUE_DROP: |
443 | skb->next = to_free_list; |
444 | to_free_list = skb; |
445 | dev->stats.tx_dropped++; |
446 | break; |
447 | case QUEUE_HW: |
448 | cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, value: -1); |
449 | break; |
450 | case QUEUE_CORE: |
451 | __skb_queue_tail(list: &priv->tx_free_list[qos], newsk: skb); |
452 | break; |
453 | default: |
454 | BUG(); |
455 | } |
456 | |
457 | while (skb_to_free > 0) { |
458 | struct sk_buff *t = __skb_dequeue(list: &priv->tx_free_list[qos]); |
459 | |
460 | t->next = to_free_list; |
461 | to_free_list = t; |
462 | skb_to_free--; |
463 | } |
464 | |
465 | spin_unlock_irqrestore(lock: &priv->tx_free_list[qos].lock, flags); |
466 | |
467 | /* Do the actual freeing outside of the lock. */ |
468 | while (to_free_list) { |
469 | struct sk_buff *t = to_free_list; |
470 | |
471 | to_free_list = to_free_list->next; |
472 | dev_kfree_skb_any(skb: t); |
473 | } |
474 | |
475 | if (USE_ASYNC_IOBDMA) { |
476 | CVMX_SYNCIOBDMA; |
477 | total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH); |
478 | /* Restore the scratch area */ |
479 | cvmx_scratch_write64(CVMX_SCR_SCRATCH, value: old_scratch); |
480 | cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, value: old_scratch2); |
481 | } else { |
482 | total_to_clean = |
483 | cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, value: 1); |
484 | } |
485 | |
486 | if (total_to_clean & 0x3ff) { |
487 | /* |
488 | * Schedule the cleanup tasklet every 1024 packets for |
489 | * the pathological case of high traffic on one port |
490 | * delaying clean up of packets on a different port |
491 | * that is blocked waiting for the cleanup. |
492 | */ |
493 | tasklet_schedule(t: &cvm_oct_tx_cleanup_tasklet); |
494 | } |
495 | |
496 | cvm_oct_kick_tx_poll_watchdog(); |
497 | |
498 | return NETDEV_TX_OK; |
499 | } |
500 | |
501 | /** |
502 | * cvm_oct_xmit_pow - transmit a packet to the POW |
503 | * @skb: Packet to send |
504 | * @dev: Device info structure |
505 | * Returns Always returns zero |
506 | */ |
507 | netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev) |
508 | { |
509 | struct octeon_ethernet *priv = netdev_priv(dev); |
510 | void *packet_buffer; |
511 | void *copy_location; |
512 | |
513 | /* Get a work queue entry */ |
514 | struct cvmx_wqe *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL); |
515 | |
516 | if (unlikely(!work)) { |
517 | printk_ratelimited("%s: Failed to allocate a work queue entry\n" , |
518 | dev->name); |
519 | dev->stats.tx_dropped++; |
520 | dev_kfree_skb_any(skb); |
521 | return 0; |
522 | } |
523 | |
524 | /* Get a packet buffer */ |
525 | packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL); |
526 | if (unlikely(!packet_buffer)) { |
527 | printk_ratelimited("%s: Failed to allocate a packet buffer\n" , |
528 | dev->name); |
529 | cvmx_fpa_free(ptr: work, CVMX_FPA_WQE_POOL, num_cache_lines: 1); |
530 | dev->stats.tx_dropped++; |
531 | dev_kfree_skb_any(skb); |
532 | return 0; |
533 | } |
534 | |
535 | /* |
536 | * Calculate where we need to copy the data to. We need to |
537 | * leave 8 bytes for a next pointer (unused). We also need to |
538 | * include any configure skip. Then we need to align the IP |
539 | * packet src and dest into the same 64bit word. The below |
540 | * calculation may add a little extra, but that doesn't |
541 | * hurt. |
542 | */ |
543 | copy_location = packet_buffer + sizeof(u64); |
544 | copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6; |
545 | |
546 | /* |
547 | * We have to copy the packet since whoever processes this |
548 | * packet will free it to a hardware pool. We can't use the |
549 | * trick of counting outstanding packets like in |
550 | * cvm_oct_xmit. |
551 | */ |
552 | memcpy(copy_location, skb->data, skb->len); |
553 | |
554 | /* |
555 | * Fill in some of the work queue fields. We may need to add |
556 | * more if the software at the other end needs them. |
557 | */ |
558 | if (!OCTEON_IS_MODEL(OCTEON_CN68XX)) |
559 | work->word0.pip.cn38xx.hw_chksum = skb->csum; |
560 | work->word1.len = skb->len; |
561 | cvmx_wqe_set_port(work, port: priv->port); |
562 | cvmx_wqe_set_qos(work, qos: priv->port & 0x7); |
563 | cvmx_wqe_set_grp(work, grp: pow_send_group); |
564 | work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE; |
565 | work->word1.tag = pow_send_group; /* FIXME */ |
566 | /* Default to zero. Sets of zero later are commented out */ |
567 | work->word2.u64 = 0; |
568 | work->word2.s.bufs = 1; |
569 | work->packet_ptr.u64 = 0; |
570 | work->packet_ptr.s.addr = cvmx_ptr_to_phys(ptr: copy_location); |
571 | work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL; |
572 | work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE; |
573 | work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7; |
574 | |
575 | if (skb->protocol == htons(ETH_P_IP)) { |
576 | work->word2.s.ip_offset = 14; |
577 | #if 0 |
578 | work->word2.s.vlan_valid = 0; /* FIXME */ |
579 | work->word2.s.vlan_cfi = 0; /* FIXME */ |
580 | work->word2.s.vlan_id = 0; /* FIXME */ |
581 | work->word2.s.dec_ipcomp = 0; /* FIXME */ |
582 | #endif |
583 | work->word2.s.tcp_or_udp = |
584 | (ip_hdr(skb)->protocol == IPPROTO_TCP) || |
585 | (ip_hdr(skb)->protocol == IPPROTO_UDP); |
586 | #if 0 |
587 | /* FIXME */ |
588 | work->word2.s.dec_ipsec = 0; |
589 | /* We only support IPv4 right now */ |
590 | work->word2.s.is_v6 = 0; |
591 | /* Hardware would set to zero */ |
592 | work->word2.s.software = 0; |
593 | /* No error, packet is internal */ |
594 | work->word2.s.L4_error = 0; |
595 | #endif |
596 | work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) || |
597 | (ip_hdr(skb)->frag_off == |
598 | cpu_to_be16(1 << 14))); |
599 | #if 0 |
600 | /* Assume Linux is sending a good packet */ |
601 | work->word2.s.IP_exc = 0; |
602 | #endif |
603 | work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST); |
604 | work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST); |
605 | #if 0 |
606 | /* This is an IP packet */ |
607 | work->word2.s.not_IP = 0; |
608 | /* No error, packet is internal */ |
609 | work->word2.s.rcv_error = 0; |
610 | /* No error, packet is internal */ |
611 | work->word2.s.err_code = 0; |
612 | #endif |
613 | |
614 | /* |
615 | * When copying the data, include 4 bytes of the |
616 | * ethernet header to align the same way hardware |
617 | * does. |
618 | */ |
619 | memcpy(work->packet_data, skb->data + 10, |
620 | sizeof(work->packet_data)); |
621 | } else { |
622 | #if 0 |
623 | work->word2.snoip.vlan_valid = 0; /* FIXME */ |
624 | work->word2.snoip.vlan_cfi = 0; /* FIXME */ |
625 | work->word2.snoip.vlan_id = 0; /* FIXME */ |
626 | work->word2.snoip.software = 0; /* Hardware would set to zero */ |
627 | #endif |
628 | work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP); |
629 | work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP); |
630 | work->word2.snoip.is_bcast = |
631 | (skb->pkt_type == PACKET_BROADCAST); |
632 | work->word2.snoip.is_mcast = |
633 | (skb->pkt_type == PACKET_MULTICAST); |
634 | work->word2.snoip.not_IP = 1; /* IP was done up above */ |
635 | #if 0 |
636 | /* No error, packet is internal */ |
637 | work->word2.snoip.rcv_error = 0; |
638 | /* No error, packet is internal */ |
639 | work->word2.snoip.err_code = 0; |
640 | #endif |
641 | memcpy(work->packet_data, skb->data, sizeof(work->packet_data)); |
642 | } |
643 | |
644 | /* Submit the packet to the POW */ |
645 | cvmx_pow_work_submit(wqp: work, tag: work->word1.tag, tag_type: work->word1.tag_type, |
646 | qos: cvmx_wqe_get_qos(work), grp: cvmx_wqe_get_grp(work)); |
647 | dev->stats.tx_packets++; |
648 | dev->stats.tx_bytes += skb->len; |
649 | dev_consume_skb_any(skb); |
650 | return 0; |
651 | } |
652 | |
653 | /** |
654 | * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX. |
655 | * @dev: Device being shutdown |
656 | * |
657 | */ |
658 | void cvm_oct_tx_shutdown_dev(struct net_device *dev) |
659 | { |
660 | struct octeon_ethernet *priv = netdev_priv(dev); |
661 | unsigned long flags; |
662 | int qos; |
663 | |
664 | for (qos = 0; qos < 16; qos++) { |
665 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
666 | while (skb_queue_len(list_: &priv->tx_free_list[qos])) |
667 | dev_kfree_skb_any(skb: __skb_dequeue |
668 | (list: &priv->tx_free_list[qos])); |
669 | spin_unlock_irqrestore(lock: &priv->tx_free_list[qos].lock, flags); |
670 | } |
671 | } |
672 | |
673 | static void cvm_oct_tx_do_cleanup(unsigned long arg) |
674 | { |
675 | int port; |
676 | |
677 | for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) { |
678 | if (cvm_oct_device[port]) { |
679 | struct net_device *dev = cvm_oct_device[port]; |
680 | |
681 | cvm_oct_free_tx_skbs(dev); |
682 | } |
683 | } |
684 | } |
685 | |
686 | static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id) |
687 | { |
688 | /* Disable the interrupt. */ |
689 | cvmx_write_csr(CVMX_CIU_TIMX(1), val: 0); |
690 | /* Do the work in the tasklet. */ |
691 | tasklet_schedule(t: &cvm_oct_tx_cleanup_tasklet); |
692 | return IRQ_HANDLED; |
693 | } |
694 | |
695 | void cvm_oct_tx_initialize(void) |
696 | { |
697 | int i; |
698 | |
699 | /* Disable the interrupt. */ |
700 | cvmx_write_csr(CVMX_CIU_TIMX(1), val: 0); |
701 | /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */ |
702 | i = request_irq(OCTEON_IRQ_TIMER1, |
703 | handler: cvm_oct_tx_cleanup_watchdog, flags: 0, |
704 | name: "Ethernet" , dev: cvm_oct_device); |
705 | |
706 | if (i) |
707 | panic(fmt: "Could not acquire Ethernet IRQ %d\n" , OCTEON_IRQ_TIMER1); |
708 | } |
709 | |
710 | void cvm_oct_tx_shutdown(void) |
711 | { |
712 | /* Free the interrupt handler */ |
713 | free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device); |
714 | } |
715 | |