Commit | Line | Data |
---|---|---|
67620987 AK |
1 | /* |
2 | * This file is based on code from OCTEON SDK by Cavium Networks. | |
80ff0fd3 | 3 | * |
166bdaa9 | 4 | * Copyright (c) 2003-2010 Cavium Networks |
80ff0fd3 DD |
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. | |
67620987 AK |
9 | */ |
10 | ||
80ff0fd3 DD |
11 | #include <linux/module.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/netdevice.h> | |
80ff0fd3 DD |
14 | #include <linux/etherdevice.h> |
15 | #include <linux/ip.h> | |
7a2eaf93 | 16 | #include <linux/ratelimit.h> |
80ff0fd3 | 17 | #include <linux/string.h> |
dc890df0 | 18 | #include <linux/interrupt.h> |
80ff0fd3 DD |
19 | #include <net/dst.h> |
20 | #ifdef CONFIG_XFRM | |
21 | #include <linux/xfrm.h> | |
22 | #include <net/xfrm.h> | |
23 | #endif /* CONFIG_XFRM */ | |
24 | ||
60063497 | 25 | #include <linux/atomic.h> |
80ff0fd3 DD |
26 | |
27 | #include <asm/octeon/octeon.h> | |
28 | ||
29 | #include "ethernet-defines.h" | |
30 | #include "octeon-ethernet.h" | |
a620c163 | 31 | #include "ethernet-tx.h" |
80ff0fd3 DD |
32 | #include "ethernet-util.h" |
33 | ||
af866496 DD |
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> | |
80ff0fd3 | 39 | |
af866496 | 40 | #include <asm/octeon/cvmx-gmxx-defs.h> |
80ff0fd3 | 41 | |
924cc268 DD |
42 | #define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb)) |
43 | ||
80ff0fd3 DD |
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 | |
215c47c9 | 48 | * example, you wanted to use the skb->priority field, define |
80ff0fd3 DD |
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 | ||
4898c560 DD |
55 | static void cvm_oct_tx_do_cleanup(unsigned long arg); |
56 | static 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) | |
6888fc87 DD |
60 | |
61 | static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau) | |
62 | { | |
63 | int32_t undo; | |
b9fc9cf2 | 64 | |
a012649d EA |
65 | undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + |
66 | MAX_SKB_TO_FREE; | |
6888fc87 DD |
67 | if (undo > 0) |
68 | cvmx_fau_atomic_add32(fau, -undo); | |
a012649d EA |
69 | skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : |
70 | -skb_to_free; | |
6888fc87 DD |
71 | return skb_to_free; |
72 | } | |
73 | ||
4898c560 DD |
74 | static void cvm_oct_kick_tx_poll_watchdog(void) |
75 | { | |
76 | union cvmx_ciu_timx ciu_timx; | |
b9fc9cf2 | 77 | |
4898c560 DD |
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 | ||
54396b6b | 84 | static void cvm_oct_free_tx_skbs(struct net_device *dev) |
6888fc87 DD |
85 | { |
86 | int32_t skb_to_free; | |
87 | int qos, queues_per_port; | |
4898c560 DD |
88 | int total_freed = 0; |
89 | int total_remaining = 0; | |
90 | unsigned long flags; | |
91 | struct octeon_ethernet *priv = netdev_priv(dev); | |
92 | ||
6888fc87 DD |
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; | |
a012649d EA |
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); | |
6888fc87 | 102 | |
4898c560 DD |
103 | |
104 | total_freed += skb_to_free; | |
105 | if (skb_to_free > 0) { | |
106 | struct sk_buff *to_free_list = NULL; | |
b9fc9cf2 | 107 | |
4898c560 DD |
108 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
109 | while (skb_to_free > 0) { | |
a012649d | 110 | struct sk_buff *t; |
b9fc9cf2 | 111 | |
a012649d | 112 | t = __skb_dequeue(&priv->tx_free_list[qos]); |
4898c560 DD |
113 | t->next = to_free_list; |
114 | to_free_list = t; | |
115 | skb_to_free--; | |
116 | } | |
a012649d EA |
117 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, |
118 | flags); | |
4898c560 DD |
119 | /* Do the actual freeing outside of the lock. */ |
120 | while (to_free_list) { | |
121 | struct sk_buff *t = to_free_list; | |
b9fc9cf2 | 122 | |
4898c560 DD |
123 | to_free_list = to_free_list->next; |
124 | dev_kfree_skb_any(t); | |
125 | } | |
6888fc87 | 126 | } |
4898c560 | 127 | total_remaining += skb_queue_len(&priv->tx_free_list[qos]); |
6888fc87 | 128 | } |
4898c560 | 129 | if (total_freed >= 0 && netif_queue_stopped(dev)) |
6888fc87 | 130 | netif_wake_queue(dev); |
4898c560 DD |
131 | if (total_remaining) |
132 | cvm_oct_kick_tx_poll_watchdog(); | |
6888fc87 DD |
133 | } |
134 | ||
80ff0fd3 | 135 | /** |
ec977c5b | 136 | * cvm_oct_xmit - transmit a packet |
80ff0fd3 DD |
137 | * @skb: Packet to send |
138 | * @dev: Device info structure | |
ec977c5b DD |
139 | * |
140 | * Returns Always returns NETDEV_TX_OK | |
80ff0fd3 DD |
141 | */ |
142 | int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) | |
143 | { | |
144 | cvmx_pko_command_word0_t pko_command; | |
145 | union cvmx_buf_ptr hw_buffer; | |
146 | uint64_t old_scratch; | |
147 | uint64_t old_scratch2; | |
80ff0fd3 | 148 | int qos; |
924cc268 | 149 | int i; |
6888fc87 | 150 | enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type; |
80ff0fd3 | 151 | struct octeon_ethernet *priv = netdev_priv(dev); |
6888fc87 | 152 | struct sk_buff *to_free_list; |
a620c163 | 153 | int32_t skb_to_free; |
80ff0fd3 | 154 | int32_t buffers_to_free; |
4898c560 | 155 | u32 total_to_clean; |
6888fc87 | 156 | unsigned long flags; |
80ff0fd3 DD |
157 | #if REUSE_SKBUFFS_WITHOUT_FREE |
158 | unsigned char *fpa_head; | |
159 | #endif | |
160 | ||
161 | /* | |
215c47c9 JM |
162 | * Prefetch the private data structure. It is larger than the |
163 | * one cache line. | |
80ff0fd3 DD |
164 | */ |
165 | prefetch(priv); | |
166 | ||
80ff0fd3 DD |
167 | /* |
168 | * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to | |
169 | * completely remove "qos" in the event neither interface | |
170 | * supports multiple queues per port. | |
171 | */ | |
172 | if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) || | |
173 | (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) { | |
174 | qos = GET_SKBUFF_QOS(skb); | |
175 | if (qos <= 0) | |
176 | qos = 0; | |
177 | else if (qos >= cvmx_pko_get_num_queues(priv->port)) | |
178 | qos = 0; | |
179 | } else | |
180 | qos = 0; | |
181 | ||
182 | if (USE_ASYNC_IOBDMA) { | |
183 | /* Save scratch in case userspace is using it */ | |
184 | CVMX_SYNCIOBDMA; | |
185 | old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH); | |
186 | old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); | |
187 | ||
188 | /* | |
a620c163 DD |
189 | * Fetch and increment the number of packets to be |
190 | * freed. | |
80ff0fd3 DD |
191 | */ |
192 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8, | |
193 | FAU_NUM_PACKET_BUFFERS_TO_FREE, | |
194 | 0); | |
195 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, | |
a620c163 DD |
196 | priv->fau + qos * 4, |
197 | MAX_SKB_TO_FREE); | |
80ff0fd3 DD |
198 | } |
199 | ||
924cc268 DD |
200 | /* |
201 | * We have space for 6 segment pointers, If there will be more | |
202 | * than that, we must linearize. | |
203 | */ | |
204 | if (unlikely(skb_shinfo(skb)->nr_frags > 5)) { | |
205 | if (unlikely(__skb_linearize(skb))) { | |
206 | queue_type = QUEUE_DROP; | |
207 | if (USE_ASYNC_IOBDMA) { | |
a012649d EA |
208 | /* |
209 | * Get the number of skbuffs in use | |
210 | * by the hardware | |
211 | */ | |
924cc268 | 212 | CVMX_SYNCIOBDMA; |
a012649d EA |
213 | skb_to_free = |
214 | cvmx_scratch_read64(CVMX_SCR_SCRATCH); | |
924cc268 | 215 | } else { |
a012649d EA |
216 | /* |
217 | * Get the number of skbuffs in use | |
218 | * by the hardware | |
219 | */ | |
220 | skb_to_free = cvmx_fau_fetch_and_add32( | |
221 | priv->fau + qos * 4, MAX_SKB_TO_FREE); | |
924cc268 | 222 | } |
a012649d EA |
223 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, |
224 | priv->fau + qos * 4); | |
924cc268 DD |
225 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
226 | goto skip_xmit; | |
227 | } | |
228 | } | |
229 | ||
80ff0fd3 DD |
230 | /* |
231 | * The CN3XXX series of parts has an errata (GMX-401) which | |
232 | * causes the GMX block to hang if a collision occurs towards | |
233 | * the end of a <68 byte packet. As a workaround for this, we | |
234 | * pad packets to be 68 bytes whenever we are in half duplex | |
235 | * mode. We don't handle the case of having a small packet but | |
236 | * no room to add the padding. The kernel should always give | |
237 | * us at least a cache line | |
238 | */ | |
239 | if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) { | |
240 | union cvmx_gmxx_prtx_cfg gmx_prt_cfg; | |
241 | int interface = INTERFACE(priv->port); | |
242 | int index = INDEX(priv->port); | |
243 | ||
244 | if (interface < 2) { | |
245 | /* We only need to pad packet in half duplex mode */ | |
246 | gmx_prt_cfg.u64 = | |
247 | cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface)); | |
248 | if (gmx_prt_cfg.s.duplex == 0) { | |
249 | int add_bytes = 64 - skb->len; | |
b9fc9cf2 | 250 | |
80ff0fd3 DD |
251 | if ((skb_tail_pointer(skb) + add_bytes) <= |
252 | skb_end_pointer(skb)) | |
253 | memset(__skb_put(skb, add_bytes), 0, | |
254 | add_bytes); | |
255 | } | |
256 | } | |
257 | } | |
258 | ||
80ff0fd3 DD |
259 | /* Build the PKO command */ |
260 | pko_command.u64 = 0; | |
8a5cc923 PM |
261 | #ifdef __LITTLE_ENDIAN |
262 | pko_command.s.le = 1; | |
263 | #endif | |
80ff0fd3 DD |
264 | pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */ |
265 | pko_command.s.segs = 1; | |
266 | pko_command.s.total_bytes = skb->len; | |
267 | pko_command.s.size0 = CVMX_FAU_OP_SIZE_32; | |
268 | pko_command.s.subone0 = 1; | |
269 | ||
270 | pko_command.s.dontfree = 1; | |
924cc268 DD |
271 | |
272 | /* Build the PKO buffer pointer */ | |
273 | hw_buffer.u64 = 0; | |
274 | if (skb_shinfo(skb)->nr_frags == 0) { | |
275 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); | |
276 | hw_buffer.s.pool = 0; | |
277 | hw_buffer.s.size = skb->len; | |
278 | } else { | |
279 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); | |
280 | hw_buffer.s.pool = 0; | |
281 | hw_buffer.s.size = skb_headlen(skb); | |
282 | CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64; | |
283 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
284 | struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i; | |
b9fc9cf2 | 285 | |
a012649d EA |
286 | hw_buffer.s.addr = XKPHYS_TO_PHYS( |
287 | (u64)(page_address(fs->page.p) + | |
288 | fs->page_offset)); | |
924cc268 DD |
289 | hw_buffer.s.size = fs->size; |
290 | CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64; | |
291 | } | |
292 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb)); | |
293 | hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1; | |
294 | pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1; | |
295 | pko_command.s.gather = 1; | |
296 | goto dont_put_skbuff_in_hw; | |
297 | } | |
298 | ||
80ff0fd3 DD |
299 | /* |
300 | * See if we can put this skb in the FPA pool. Any strange | |
301 | * behavior from the Linux networking stack will most likely | |
302 | * be caused by a bug in the following code. If some field is | |
215c47c9 JM |
303 | * in use by the network stack and gets carried over when a |
304 | * buffer is reused, bad things may happen. If in doubt and | |
80ff0fd3 DD |
305 | * you dont need the absolute best performance, disable the |
306 | * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has | |
307 | * shown a 25% increase in performance under some loads. | |
308 | */ | |
309 | #if REUSE_SKBUFFS_WITHOUT_FREE | |
166bdaa9 | 310 | fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f); |
80ff0fd3 DD |
311 | if (unlikely(skb->data < fpa_head)) { |
312 | /* | |
313 | * printk("TX buffer beginning can't meet FPA | |
314 | * alignment constraints\n"); | |
315 | */ | |
316 | goto dont_put_skbuff_in_hw; | |
317 | } | |
318 | if (unlikely | |
319 | ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) { | |
320 | /* | |
321 | printk("TX buffer isn't large enough for the FPA\n"); | |
322 | */ | |
323 | goto dont_put_skbuff_in_hw; | |
324 | } | |
325 | if (unlikely(skb_shared(skb))) { | |
326 | /* | |
327 | printk("TX buffer sharing data with someone else\n"); | |
328 | */ | |
329 | goto dont_put_skbuff_in_hw; | |
330 | } | |
331 | if (unlikely(skb_cloned(skb))) { | |
332 | /* | |
333 | printk("TX buffer has been cloned\n"); | |
334 | */ | |
335 | goto dont_put_skbuff_in_hw; | |
336 | } | |
337 | if (unlikely(skb_header_cloned(skb))) { | |
338 | /* | |
339 | printk("TX buffer header has been cloned\n"); | |
340 | */ | |
341 | goto dont_put_skbuff_in_hw; | |
342 | } | |
343 | if (unlikely(skb->destructor)) { | |
344 | /* | |
345 | printk("TX buffer has a destructor\n"); | |
346 | */ | |
347 | goto dont_put_skbuff_in_hw; | |
348 | } | |
349 | if (unlikely(skb_shinfo(skb)->nr_frags)) { | |
350 | /* | |
351 | printk("TX buffer has fragments\n"); | |
352 | */ | |
353 | goto dont_put_skbuff_in_hw; | |
354 | } | |
355 | if (unlikely | |
356 | (skb->truesize != | |
ec47ea82 | 357 | sizeof(*skb) + skb_end_offset(skb))) { |
80ff0fd3 DD |
358 | /* |
359 | printk("TX buffer truesize has been changed\n"); | |
360 | */ | |
361 | goto dont_put_skbuff_in_hw; | |
362 | } | |
363 | ||
364 | /* | |
365 | * We can use this buffer in the FPA. We don't need the FAU | |
366 | * update anymore | |
367 | */ | |
80ff0fd3 DD |
368 | pko_command.s.dontfree = 0; |
369 | ||
a012649d EA |
370 | hw_buffer.s.back = ((unsigned long)skb->data >> 7) - |
371 | ((unsigned long)fpa_head >> 7); | |
372 | ||
80ff0fd3 DD |
373 | *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb; |
374 | ||
375 | /* | |
376 | * The skbuff will be reused without ever being freed. We must | |
f696a108 | 377 | * cleanup a bunch of core things. |
80ff0fd3 | 378 | */ |
f696a108 DD |
379 | dst_release(skb_dst(skb)); |
380 | skb_dst_set(skb, NULL); | |
80ff0fd3 DD |
381 | #ifdef CONFIG_XFRM |
382 | secpath_put(skb->sp); | |
383 | skb->sp = NULL; | |
384 | #endif | |
385 | nf_reset(skb); | |
386 | ||
387 | #ifdef CONFIG_NET_SCHED | |
388 | skb->tc_index = 0; | |
389 | #ifdef CONFIG_NET_CLS_ACT | |
390 | skb->tc_verd = 0; | |
391 | #endif /* CONFIG_NET_CLS_ACT */ | |
392 | #endif /* CONFIG_NET_SCHED */ | |
6888fc87 | 393 | #endif /* REUSE_SKBUFFS_WITHOUT_FREE */ |
80ff0fd3 DD |
394 | |
395 | dont_put_skbuff_in_hw: | |
80ff0fd3 DD |
396 | |
397 | /* Check if we can use the hardware checksumming */ | |
6646baf7 | 398 | if ((skb->protocol == htons(ETH_P_IP)) && |
861e82d5 JK |
399 | (ip_hdr(skb)->version == 4) && |
400 | (ip_hdr(skb)->ihl == 5) && | |
401 | ((ip_hdr(skb)->frag_off == 0) || | |
402 | (ip_hdr(skb)->frag_off == htons(1 << 14))) && | |
403 | ((ip_hdr(skb)->protocol == IPPROTO_TCP) || | |
404 | (ip_hdr(skb)->protocol == IPPROTO_UDP))) { | |
80ff0fd3 DD |
405 | /* Use hardware checksum calc */ |
406 | pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1; | |
407 | } | |
408 | ||
409 | if (USE_ASYNC_IOBDMA) { | |
410 | /* Get the number of skbuffs in use by the hardware */ | |
411 | CVMX_SYNCIOBDMA; | |
a620c163 | 412 | skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH); |
80ff0fd3 DD |
413 | buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); |
414 | } else { | |
415 | /* Get the number of skbuffs in use by the hardware */ | |
a620c163 DD |
416 | skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4, |
417 | MAX_SKB_TO_FREE); | |
80ff0fd3 DD |
418 | buffers_to_free = |
419 | cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0); | |
420 | } | |
421 | ||
6888fc87 | 422 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4); |
a620c163 | 423 | |
80ff0fd3 DD |
424 | /* |
425 | * If we're sending faster than the receive can free them then | |
426 | * don't do the HW free. | |
427 | */ | |
4898c560 | 428 | if ((buffers_to_free < -100) && !pko_command.s.dontfree) |
80ff0fd3 | 429 | pko_command.s.dontfree = 1; |
80ff0fd3 | 430 | |
4898c560 | 431 | if (pko_command.s.dontfree) { |
6888fc87 | 432 | queue_type = QUEUE_CORE; |
4898c560 DD |
433 | pko_command.s.reg0 = priv->fau+qos*4; |
434 | } else { | |
6888fc87 | 435 | queue_type = QUEUE_HW; |
4898c560 DD |
436 | } |
437 | if (USE_ASYNC_IOBDMA) | |
a012649d EA |
438 | cvmx_fau_async_fetch_and_add32( |
439 | CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1); | |
6888fc87 DD |
440 | |
441 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); | |
80ff0fd3 DD |
442 | |
443 | /* Drop this packet if we have too many already queued to the HW */ | |
a012649d EA |
444 | if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= |
445 | MAX_OUT_QUEUE_DEPTH)) { | |
446 | ||
6888fc87 DD |
447 | if (dev->tx_queue_len != 0) { |
448 | /* Drop the lock when notifying the core. */ | |
a012649d EA |
449 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, |
450 | flags); | |
6888fc87 | 451 | netif_stop_queue(dev); |
a012649d EA |
452 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, |
453 | flags); | |
6888fc87 DD |
454 | } else { |
455 | /* If not using normal queueing. */ | |
456 | queue_type = QUEUE_DROP; | |
457 | goto skip_xmit; | |
458 | } | |
80ff0fd3 | 459 | } |
6888fc87 DD |
460 | |
461 | cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos, | |
462 | CVMX_PKO_LOCK_NONE); | |
463 | ||
80ff0fd3 | 464 | /* Send the packet to the output queue */ |
6888fc87 DD |
465 | if (unlikely(cvmx_pko_send_packet_finish(priv->port, |
466 | priv->queue + qos, | |
467 | pko_command, hw_buffer, | |
468 | CVMX_PKO_LOCK_NONE))) { | |
a012649d EA |
469 | printk_ratelimited("%s: Failed to send the packet\n", |
470 | dev->name); | |
6888fc87 | 471 | queue_type = QUEUE_DROP; |
80ff0fd3 | 472 | } |
6888fc87 DD |
473 | skip_xmit: |
474 | to_free_list = NULL; | |
80ff0fd3 | 475 | |
6888fc87 DD |
476 | switch (queue_type) { |
477 | case QUEUE_DROP: | |
478 | skb->next = to_free_list; | |
479 | to_free_list = skb; | |
480 | priv->stats.tx_dropped++; | |
481 | break; | |
482 | case QUEUE_HW: | |
483 | cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1); | |
484 | break; | |
485 | case QUEUE_CORE: | |
486 | __skb_queue_tail(&priv->tx_free_list[qos], skb); | |
487 | break; | |
488 | default: | |
489 | BUG(); | |
80ff0fd3 DD |
490 | } |
491 | ||
6888fc87 DD |
492 | while (skb_to_free > 0) { |
493 | struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]); | |
b9fc9cf2 | 494 | |
6888fc87 DD |
495 | t->next = to_free_list; |
496 | to_free_list = t; | |
497 | skb_to_free--; | |
80ff0fd3 DD |
498 | } |
499 | ||
6888fc87 DD |
500 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); |
501 | ||
502 | /* Do the actual freeing outside of the lock. */ | |
503 | while (to_free_list) { | |
504 | struct sk_buff *t = to_free_list; | |
b9fc9cf2 | 505 | |
6888fc87 DD |
506 | to_free_list = to_free_list->next; |
507 | dev_kfree_skb_any(t); | |
508 | } | |
509 | ||
510 | if (USE_ASYNC_IOBDMA) { | |
4898c560 DD |
511 | CVMX_SYNCIOBDMA; |
512 | total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH); | |
6888fc87 DD |
513 | /* Restore the scratch area */ |
514 | cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch); | |
515 | cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2); | |
4898c560 | 516 | } else { |
a012649d EA |
517 | total_to_clean = cvmx_fau_fetch_and_add32( |
518 | FAU_TOTAL_TX_TO_CLEAN, 1); | |
80ff0fd3 DD |
519 | } |
520 | ||
4898c560 DD |
521 | if (total_to_clean & 0x3ff) { |
522 | /* | |
523 | * Schedule the cleanup tasklet every 1024 packets for | |
524 | * the pathological case of high traffic on one port | |
525 | * delaying clean up of packets on a different port | |
526 | * that is blocked waiting for the cleanup. | |
527 | */ | |
528 | tasklet_schedule(&cvm_oct_tx_cleanup_tasklet); | |
529 | } | |
530 | ||
531 | cvm_oct_kick_tx_poll_watchdog(); | |
532 | ||
6888fc87 | 533 | return NETDEV_TX_OK; |
80ff0fd3 DD |
534 | } |
535 | ||
536 | /** | |
ec977c5b | 537 | * cvm_oct_xmit_pow - transmit a packet to the POW |
80ff0fd3 DD |
538 | * @skb: Packet to send |
539 | * @dev: Device info structure | |
ec977c5b | 540 | |
80ff0fd3 DD |
541 | * Returns Always returns zero |
542 | */ | |
543 | int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev) | |
544 | { | |
545 | struct octeon_ethernet *priv = netdev_priv(dev); | |
546 | void *packet_buffer; | |
547 | void *copy_location; | |
548 | ||
549 | /* Get a work queue entry */ | |
550 | cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL); | |
b9fc9cf2 | 551 | |
80ff0fd3 | 552 | if (unlikely(work == NULL)) { |
6b478c2c EA |
553 | printk_ratelimited("%s: Failed to allocate a work queue entry\n", |
554 | dev->name); | |
80ff0fd3 | 555 | priv->stats.tx_dropped++; |
8b6da5fb | 556 | dev_kfree_skb_any(skb); |
80ff0fd3 DD |
557 | return 0; |
558 | } | |
559 | ||
560 | /* Get a packet buffer */ | |
561 | packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL); | |
562 | if (unlikely(packet_buffer == NULL)) { | |
7a2eaf93 CD |
563 | printk_ratelimited("%s: Failed to allocate a packet buffer\n", |
564 | dev->name); | |
c93b0e75 | 565 | cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1); |
80ff0fd3 | 566 | priv->stats.tx_dropped++; |
8b6da5fb | 567 | dev_kfree_skb_any(skb); |
80ff0fd3 DD |
568 | return 0; |
569 | } | |
570 | ||
571 | /* | |
572 | * Calculate where we need to copy the data to. We need to | |
573 | * leave 8 bytes for a next pointer (unused). We also need to | |
574 | * include any configure skip. Then we need to align the IP | |
575 | * packet src and dest into the same 64bit word. The below | |
576 | * calculation may add a little extra, but that doesn't | |
577 | * hurt. | |
578 | */ | |
579 | copy_location = packet_buffer + sizeof(uint64_t); | |
580 | copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6; | |
581 | ||
582 | /* | |
583 | * We have to copy the packet since whoever processes this | |
584 | * packet will free it to a hardware pool. We can't use the | |
585 | * trick of counting outstanding packets like in | |
586 | * cvm_oct_xmit. | |
587 | */ | |
588 | memcpy(copy_location, skb->data, skb->len); | |
589 | ||
590 | /* | |
591 | * Fill in some of the work queue fields. We may need to add | |
592 | * more if the software at the other end needs them. | |
593 | */ | |
594 | work->hw_chksum = skb->csum; | |
595 | work->len = skb->len; | |
596 | work->ipprt = priv->port; | |
597 | work->qos = priv->port & 0x7; | |
598 | work->grp = pow_send_group; | |
599 | work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE; | |
600 | work->tag = pow_send_group; /* FIXME */ | |
601 | /* Default to zero. Sets of zero later are commented out */ | |
602 | work->word2.u64 = 0; | |
603 | work->word2.s.bufs = 1; | |
604 | work->packet_ptr.u64 = 0; | |
605 | work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location); | |
606 | work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL; | |
607 | work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE; | |
608 | work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7; | |
609 | ||
610 | if (skb->protocol == htons(ETH_P_IP)) { | |
611 | work->word2.s.ip_offset = 14; | |
612 | #if 0 | |
613 | work->word2.s.vlan_valid = 0; /* FIXME */ | |
614 | work->word2.s.vlan_cfi = 0; /* FIXME */ | |
615 | work->word2.s.vlan_id = 0; /* FIXME */ | |
616 | work->word2.s.dec_ipcomp = 0; /* FIXME */ | |
617 | #endif | |
618 | work->word2.s.tcp_or_udp = | |
081f6749 DD |
619 | (ip_hdr(skb)->protocol == IPPROTO_TCP) |
620 | || (ip_hdr(skb)->protocol == IPPROTO_UDP); | |
80ff0fd3 DD |
621 | #if 0 |
622 | /* FIXME */ | |
623 | work->word2.s.dec_ipsec = 0; | |
624 | /* We only support IPv4 right now */ | |
625 | work->word2.s.is_v6 = 0; | |
626 | /* Hardware would set to zero */ | |
627 | work->word2.s.software = 0; | |
628 | /* No error, packet is internal */ | |
629 | work->word2.s.L4_error = 0; | |
630 | #endif | |
631 | work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) | |
632 | || (ip_hdr(skb)->frag_off == | |
633 | 1 << 14)); | |
634 | #if 0 | |
635 | /* Assume Linux is sending a good packet */ | |
636 | work->word2.s.IP_exc = 0; | |
637 | #endif | |
638 | work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST); | |
639 | work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST); | |
640 | #if 0 | |
641 | /* This is an IP packet */ | |
642 | work->word2.s.not_IP = 0; | |
643 | /* No error, packet is internal */ | |
644 | work->word2.s.rcv_error = 0; | |
645 | /* No error, packet is internal */ | |
646 | work->word2.s.err_code = 0; | |
647 | #endif | |
648 | ||
649 | /* | |
650 | * When copying the data, include 4 bytes of the | |
651 | * ethernet header to align the same way hardware | |
652 | * does. | |
653 | */ | |
654 | memcpy(work->packet_data, skb->data + 10, | |
655 | sizeof(work->packet_data)); | |
656 | } else { | |
657 | #if 0 | |
658 | work->word2.snoip.vlan_valid = 0; /* FIXME */ | |
659 | work->word2.snoip.vlan_cfi = 0; /* FIXME */ | |
660 | work->word2.snoip.vlan_id = 0; /* FIXME */ | |
661 | work->word2.snoip.software = 0; /* Hardware would set to zero */ | |
662 | #endif | |
663 | work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP); | |
664 | work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP); | |
665 | work->word2.snoip.is_bcast = | |
666 | (skb->pkt_type == PACKET_BROADCAST); | |
667 | work->word2.snoip.is_mcast = | |
668 | (skb->pkt_type == PACKET_MULTICAST); | |
669 | work->word2.snoip.not_IP = 1; /* IP was done up above */ | |
670 | #if 0 | |
671 | /* No error, packet is internal */ | |
672 | work->word2.snoip.rcv_error = 0; | |
673 | /* No error, packet is internal */ | |
674 | work->word2.snoip.err_code = 0; | |
675 | #endif | |
676 | memcpy(work->packet_data, skb->data, sizeof(work->packet_data)); | |
677 | } | |
678 | ||
679 | /* Submit the packet to the POW */ | |
680 | cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos, | |
681 | work->grp); | |
682 | priv->stats.tx_packets++; | |
683 | priv->stats.tx_bytes += skb->len; | |
8b6da5fb | 684 | dev_consume_skb_any(skb); |
80ff0fd3 DD |
685 | return 0; |
686 | } | |
687 | ||
80ff0fd3 | 688 | /** |
ec977c5b | 689 | * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX. |
80ff0fd3 | 690 | * @dev: Device being shutdown |
ec977c5b | 691 | * |
80ff0fd3 | 692 | */ |
4898c560 | 693 | void cvm_oct_tx_shutdown_dev(struct net_device *dev) |
80ff0fd3 DD |
694 | { |
695 | struct octeon_ethernet *priv = netdev_priv(dev); | |
696 | unsigned long flags; | |
697 | int qos; | |
698 | ||
699 | for (qos = 0; qos < 16; qos++) { | |
700 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); | |
701 | while (skb_queue_len(&priv->tx_free_list[qos])) | |
702 | dev_kfree_skb_any(__skb_dequeue | |
703 | (&priv->tx_free_list[qos])); | |
704 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); | |
705 | } | |
706 | } | |
4898c560 DD |
707 | |
708 | static void cvm_oct_tx_do_cleanup(unsigned long arg) | |
709 | { | |
710 | int port; | |
711 | ||
712 | for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) { | |
713 | if (cvm_oct_device[port]) { | |
714 | struct net_device *dev = cvm_oct_device[port]; | |
b9fc9cf2 | 715 | |
4898c560 DD |
716 | cvm_oct_free_tx_skbs(dev); |
717 | } | |
718 | } | |
719 | } | |
720 | ||
721 | static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id) | |
722 | { | |
723 | /* Disable the interrupt. */ | |
724 | cvmx_write_csr(CVMX_CIU_TIMX(1), 0); | |
725 | /* Do the work in the tasklet. */ | |
726 | tasklet_schedule(&cvm_oct_tx_cleanup_tasklet); | |
727 | return IRQ_HANDLED; | |
728 | } | |
729 | ||
730 | void cvm_oct_tx_initialize(void) | |
731 | { | |
732 | int i; | |
733 | ||
734 | /* Disable the interrupt. */ | |
735 | cvmx_write_csr(CVMX_CIU_TIMX(1), 0); | |
811a7519 | 736 | /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */ |
4898c560 DD |
737 | i = request_irq(OCTEON_IRQ_TIMER1, |
738 | cvm_oct_tx_cleanup_watchdog, 0, | |
739 | "Ethernet", cvm_oct_device); | |
740 | ||
741 | if (i) | |
742 | panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1); | |
743 | } | |
744 | ||
745 | void cvm_oct_tx_shutdown(void) | |
746 | { | |
747 | /* Free the interrupt handler */ | |
748 | free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device); | |
749 | } |