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80ff0fd3 DD |
1 | /********************************************************************* |
2 | * Author: Cavium Networks | |
3 | * | |
4 | * Contact: support@caviumnetworks.com | |
5 | * This file is part of the OCTEON SDK | |
6 | * | |
166bdaa9 | 7 | * Copyright (c) 2003-2010 Cavium Networks |
80ff0fd3 DD |
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> | |
7a2eaf93 | 33 | #include <linux/ratelimit.h> |
80ff0fd3 | 34 | #include <linux/string.h> |
dc890df0 | 35 | #include <linux/interrupt.h> |
80ff0fd3 DD |
36 | #include <net/dst.h> |
37 | #ifdef CONFIG_XFRM | |
38 | #include <linux/xfrm.h> | |
39 | #include <net/xfrm.h> | |
40 | #endif /* CONFIG_XFRM */ | |
41 | ||
60063497 | 42 | #include <linux/atomic.h> |
80ff0fd3 DD |
43 | |
44 | #include <asm/octeon/octeon.h> | |
45 | ||
46 | #include "ethernet-defines.h" | |
47 | #include "octeon-ethernet.h" | |
a620c163 | 48 | #include "ethernet-tx.h" |
80ff0fd3 DD |
49 | #include "ethernet-util.h" |
50 | ||
af866496 DD |
51 | #include <asm/octeon/cvmx-wqe.h> |
52 | #include <asm/octeon/cvmx-fau.h> | |
53 | #include <asm/octeon/cvmx-pip.h> | |
54 | #include <asm/octeon/cvmx-pko.h> | |
55 | #include <asm/octeon/cvmx-helper.h> | |
80ff0fd3 | 56 | |
af866496 | 57 | #include <asm/octeon/cvmx-gmxx-defs.h> |
80ff0fd3 | 58 | |
924cc268 DD |
59 | #define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb)) |
60 | ||
80ff0fd3 DD |
61 | /* |
62 | * You can define GET_SKBUFF_QOS() to override how the skbuff output | |
63 | * function determines which output queue is used. The default | |
64 | * implementation always uses the base queue for the port. If, for | |
215c47c9 | 65 | * example, you wanted to use the skb->priority field, define |
80ff0fd3 DD |
66 | * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority) |
67 | */ | |
68 | #ifndef GET_SKBUFF_QOS | |
69 | #define GET_SKBUFF_QOS(skb) 0 | |
70 | #endif | |
71 | ||
4898c560 DD |
72 | static void cvm_oct_tx_do_cleanup(unsigned long arg); |
73 | static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0); | |
74 | ||
75 | /* Maximum number of SKBs to try to free per xmit packet. */ | |
76 | #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2) | |
6888fc87 DD |
77 | |
78 | static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau) | |
79 | { | |
80 | int32_t undo; | |
81 | undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE; | |
82 | if (undo > 0) | |
83 | cvmx_fau_atomic_add32(fau, -undo); | |
84 | skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : -skb_to_free; | |
85 | return skb_to_free; | |
86 | } | |
87 | ||
4898c560 DD |
88 | static void cvm_oct_kick_tx_poll_watchdog(void) |
89 | { | |
90 | union cvmx_ciu_timx ciu_timx; | |
91 | ciu_timx.u64 = 0; | |
92 | ciu_timx.s.one_shot = 1; | |
93 | ciu_timx.s.len = cvm_oct_tx_poll_interval; | |
94 | cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64); | |
95 | } | |
96 | ||
97 | void cvm_oct_free_tx_skbs(struct net_device *dev) | |
6888fc87 DD |
98 | { |
99 | int32_t skb_to_free; | |
100 | int qos, queues_per_port; | |
4898c560 DD |
101 | int total_freed = 0; |
102 | int total_remaining = 0; | |
103 | unsigned long flags; | |
104 | struct octeon_ethernet *priv = netdev_priv(dev); | |
105 | ||
6888fc87 DD |
106 | queues_per_port = cvmx_pko_get_num_queues(priv->port); |
107 | /* Drain any pending packets in the free list */ | |
108 | for (qos = 0; qos < queues_per_port; qos++) { | |
109 | if (skb_queue_len(&priv->tx_free_list[qos]) == 0) | |
110 | continue; | |
111 | skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4, MAX_SKB_TO_FREE); | |
112 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4); | |
113 | ||
4898c560 DD |
114 | |
115 | total_freed += skb_to_free; | |
116 | if (skb_to_free > 0) { | |
117 | struct sk_buff *to_free_list = NULL; | |
118 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); | |
119 | while (skb_to_free > 0) { | |
120 | struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]); | |
121 | t->next = to_free_list; | |
122 | to_free_list = t; | |
123 | skb_to_free--; | |
124 | } | |
125 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); | |
126 | /* Do the actual freeing outside of the lock. */ | |
127 | while (to_free_list) { | |
128 | struct sk_buff *t = to_free_list; | |
129 | to_free_list = to_free_list->next; | |
130 | dev_kfree_skb_any(t); | |
131 | } | |
6888fc87 | 132 | } |
4898c560 | 133 | total_remaining += skb_queue_len(&priv->tx_free_list[qos]); |
6888fc87 | 134 | } |
4898c560 | 135 | if (total_freed >= 0 && netif_queue_stopped(dev)) |
6888fc87 | 136 | netif_wake_queue(dev); |
4898c560 DD |
137 | if (total_remaining) |
138 | cvm_oct_kick_tx_poll_watchdog(); | |
6888fc87 DD |
139 | } |
140 | ||
80ff0fd3 | 141 | /** |
ec977c5b | 142 | * cvm_oct_xmit - transmit a packet |
80ff0fd3 DD |
143 | * @skb: Packet to send |
144 | * @dev: Device info structure | |
ec977c5b DD |
145 | * |
146 | * Returns Always returns NETDEV_TX_OK | |
80ff0fd3 DD |
147 | */ |
148 | int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) | |
149 | { | |
150 | cvmx_pko_command_word0_t pko_command; | |
151 | union cvmx_buf_ptr hw_buffer; | |
152 | uint64_t old_scratch; | |
153 | uint64_t old_scratch2; | |
80ff0fd3 | 154 | int qos; |
924cc268 | 155 | int i; |
6888fc87 | 156 | enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type; |
80ff0fd3 | 157 | struct octeon_ethernet *priv = netdev_priv(dev); |
6888fc87 | 158 | struct sk_buff *to_free_list; |
a620c163 | 159 | int32_t skb_to_free; |
80ff0fd3 | 160 | int32_t buffers_to_free; |
4898c560 | 161 | u32 total_to_clean; |
6888fc87 | 162 | unsigned long flags; |
80ff0fd3 DD |
163 | #if REUSE_SKBUFFS_WITHOUT_FREE |
164 | unsigned char *fpa_head; | |
165 | #endif | |
166 | ||
167 | /* | |
215c47c9 JM |
168 | * Prefetch the private data structure. It is larger than the |
169 | * one cache line. | |
80ff0fd3 DD |
170 | */ |
171 | prefetch(priv); | |
172 | ||
80ff0fd3 DD |
173 | /* |
174 | * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to | |
175 | * completely remove "qos" in the event neither interface | |
176 | * supports multiple queues per port. | |
177 | */ | |
178 | if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) || | |
179 | (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) { | |
180 | qos = GET_SKBUFF_QOS(skb); | |
181 | if (qos <= 0) | |
182 | qos = 0; | |
183 | else if (qos >= cvmx_pko_get_num_queues(priv->port)) | |
184 | qos = 0; | |
185 | } else | |
186 | qos = 0; | |
187 | ||
188 | if (USE_ASYNC_IOBDMA) { | |
189 | /* Save scratch in case userspace is using it */ | |
190 | CVMX_SYNCIOBDMA; | |
191 | old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH); | |
192 | old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); | |
193 | ||
194 | /* | |
a620c163 DD |
195 | * Fetch and increment the number of packets to be |
196 | * freed. | |
80ff0fd3 DD |
197 | */ |
198 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8, | |
199 | FAU_NUM_PACKET_BUFFERS_TO_FREE, | |
200 | 0); | |
201 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, | |
a620c163 DD |
202 | priv->fau + qos * 4, |
203 | MAX_SKB_TO_FREE); | |
80ff0fd3 DD |
204 | } |
205 | ||
924cc268 DD |
206 | /* |
207 | * We have space for 6 segment pointers, If there will be more | |
208 | * than that, we must linearize. | |
209 | */ | |
210 | if (unlikely(skb_shinfo(skb)->nr_frags > 5)) { | |
211 | if (unlikely(__skb_linearize(skb))) { | |
212 | queue_type = QUEUE_DROP; | |
213 | if (USE_ASYNC_IOBDMA) { | |
214 | /* Get the number of skbuffs in use by the hardware */ | |
215 | CVMX_SYNCIOBDMA; | |
216 | skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH); | |
217 | } else { | |
218 | /* Get the number of skbuffs in use by the hardware */ | |
219 | skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4, | |
220 | MAX_SKB_TO_FREE); | |
221 | } | |
222 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau + qos * 4); | |
223 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); | |
224 | goto skip_xmit; | |
225 | } | |
226 | } | |
227 | ||
80ff0fd3 DD |
228 | /* |
229 | * The CN3XXX series of parts has an errata (GMX-401) which | |
230 | * causes the GMX block to hang if a collision occurs towards | |
231 | * the end of a <68 byte packet. As a workaround for this, we | |
232 | * pad packets to be 68 bytes whenever we are in half duplex | |
233 | * mode. We don't handle the case of having a small packet but | |
234 | * no room to add the padding. The kernel should always give | |
235 | * us at least a cache line | |
236 | */ | |
237 | if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) { | |
238 | union cvmx_gmxx_prtx_cfg gmx_prt_cfg; | |
239 | int interface = INTERFACE(priv->port); | |
240 | int index = INDEX(priv->port); | |
241 | ||
242 | if (interface < 2) { | |
243 | /* We only need to pad packet in half duplex mode */ | |
244 | gmx_prt_cfg.u64 = | |
245 | cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface)); | |
246 | if (gmx_prt_cfg.s.duplex == 0) { | |
247 | int add_bytes = 64 - skb->len; | |
248 | if ((skb_tail_pointer(skb) + add_bytes) <= | |
249 | skb_end_pointer(skb)) | |
250 | memset(__skb_put(skb, add_bytes), 0, | |
251 | add_bytes); | |
252 | } | |
253 | } | |
254 | } | |
255 | ||
80ff0fd3 DD |
256 | /* Build the PKO command */ |
257 | pko_command.u64 = 0; | |
258 | pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */ | |
259 | pko_command.s.segs = 1; | |
260 | pko_command.s.total_bytes = skb->len; | |
261 | pko_command.s.size0 = CVMX_FAU_OP_SIZE_32; | |
262 | pko_command.s.subone0 = 1; | |
263 | ||
264 | pko_command.s.dontfree = 1; | |
924cc268 DD |
265 | |
266 | /* Build the PKO buffer pointer */ | |
267 | hw_buffer.u64 = 0; | |
268 | if (skb_shinfo(skb)->nr_frags == 0) { | |
269 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); | |
270 | hw_buffer.s.pool = 0; | |
271 | hw_buffer.s.size = skb->len; | |
272 | } else { | |
273 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); | |
274 | hw_buffer.s.pool = 0; | |
275 | hw_buffer.s.size = skb_headlen(skb); | |
276 | CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64; | |
277 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
278 | struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i; | |
8d804d4f | 279 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)(page_address(fs->page.p) + fs->page_offset)); |
924cc268 DD |
280 | hw_buffer.s.size = fs->size; |
281 | CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64; | |
282 | } | |
283 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb)); | |
284 | hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1; | |
285 | pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1; | |
286 | pko_command.s.gather = 1; | |
287 | goto dont_put_skbuff_in_hw; | |
288 | } | |
289 | ||
80ff0fd3 DD |
290 | /* |
291 | * See if we can put this skb in the FPA pool. Any strange | |
292 | * behavior from the Linux networking stack will most likely | |
293 | * be caused by a bug in the following code. If some field is | |
215c47c9 JM |
294 | * in use by the network stack and gets carried over when a |
295 | * buffer is reused, bad things may happen. If in doubt and | |
80ff0fd3 DD |
296 | * you dont need the absolute best performance, disable the |
297 | * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has | |
298 | * shown a 25% increase in performance under some loads. | |
299 | */ | |
300 | #if REUSE_SKBUFFS_WITHOUT_FREE | |
166bdaa9 | 301 | fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f); |
80ff0fd3 DD |
302 | if (unlikely(skb->data < fpa_head)) { |
303 | /* | |
304 | * printk("TX buffer beginning can't meet FPA | |
305 | * alignment constraints\n"); | |
306 | */ | |
307 | goto dont_put_skbuff_in_hw; | |
308 | } | |
309 | if (unlikely | |
310 | ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) { | |
311 | /* | |
312 | printk("TX buffer isn't large enough for the FPA\n"); | |
313 | */ | |
314 | goto dont_put_skbuff_in_hw; | |
315 | } | |
316 | if (unlikely(skb_shared(skb))) { | |
317 | /* | |
318 | printk("TX buffer sharing data with someone else\n"); | |
319 | */ | |
320 | goto dont_put_skbuff_in_hw; | |
321 | } | |
322 | if (unlikely(skb_cloned(skb))) { | |
323 | /* | |
324 | printk("TX buffer has been cloned\n"); | |
325 | */ | |
326 | goto dont_put_skbuff_in_hw; | |
327 | } | |
328 | if (unlikely(skb_header_cloned(skb))) { | |
329 | /* | |
330 | printk("TX buffer header has been cloned\n"); | |
331 | */ | |
332 | goto dont_put_skbuff_in_hw; | |
333 | } | |
334 | if (unlikely(skb->destructor)) { | |
335 | /* | |
336 | printk("TX buffer has a destructor\n"); | |
337 | */ | |
338 | goto dont_put_skbuff_in_hw; | |
339 | } | |
340 | if (unlikely(skb_shinfo(skb)->nr_frags)) { | |
341 | /* | |
342 | printk("TX buffer has fragments\n"); | |
343 | */ | |
344 | goto dont_put_skbuff_in_hw; | |
345 | } | |
346 | if (unlikely | |
347 | (skb->truesize != | |
ec47ea82 | 348 | sizeof(*skb) + skb_end_offset(skb))) { |
80ff0fd3 DD |
349 | /* |
350 | printk("TX buffer truesize has been changed\n"); | |
351 | */ | |
352 | goto dont_put_skbuff_in_hw; | |
353 | } | |
354 | ||
355 | /* | |
356 | * We can use this buffer in the FPA. We don't need the FAU | |
357 | * update anymore | |
358 | */ | |
80ff0fd3 DD |
359 | pko_command.s.dontfree = 0; |
360 | ||
166bdaa9 | 361 | hw_buffer.s.back = ((unsigned long)skb->data >> 7) - ((unsigned long)fpa_head >> 7); |
80ff0fd3 DD |
362 | *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb; |
363 | ||
364 | /* | |
365 | * The skbuff will be reused without ever being freed. We must | |
f696a108 | 366 | * cleanup a bunch of core things. |
80ff0fd3 | 367 | */ |
f696a108 DD |
368 | dst_release(skb_dst(skb)); |
369 | skb_dst_set(skb, NULL); | |
80ff0fd3 DD |
370 | #ifdef CONFIG_XFRM |
371 | secpath_put(skb->sp); | |
372 | skb->sp = NULL; | |
373 | #endif | |
374 | nf_reset(skb); | |
375 | ||
376 | #ifdef CONFIG_NET_SCHED | |
377 | skb->tc_index = 0; | |
378 | #ifdef CONFIG_NET_CLS_ACT | |
379 | skb->tc_verd = 0; | |
380 | #endif /* CONFIG_NET_CLS_ACT */ | |
381 | #endif /* CONFIG_NET_SCHED */ | |
6888fc87 | 382 | #endif /* REUSE_SKBUFFS_WITHOUT_FREE */ |
80ff0fd3 DD |
383 | |
384 | dont_put_skbuff_in_hw: | |
80ff0fd3 DD |
385 | |
386 | /* Check if we can use the hardware checksumming */ | |
387 | if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) && | |
388 | (ip_hdr(skb)->version == 4) && (ip_hdr(skb)->ihl == 5) && | |
389 | ((ip_hdr(skb)->frag_off == 0) || (ip_hdr(skb)->frag_off == 1 << 14)) | |
081f6749 DD |
390 | && ((ip_hdr(skb)->protocol == IPPROTO_TCP) |
391 | || (ip_hdr(skb)->protocol == IPPROTO_UDP))) { | |
80ff0fd3 DD |
392 | /* Use hardware checksum calc */ |
393 | pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1; | |
394 | } | |
395 | ||
396 | if (USE_ASYNC_IOBDMA) { | |
397 | /* Get the number of skbuffs in use by the hardware */ | |
398 | CVMX_SYNCIOBDMA; | |
a620c163 | 399 | skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH); |
80ff0fd3 DD |
400 | buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); |
401 | } else { | |
402 | /* Get the number of skbuffs in use by the hardware */ | |
a620c163 DD |
403 | skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4, |
404 | MAX_SKB_TO_FREE); | |
80ff0fd3 DD |
405 | buffers_to_free = |
406 | cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0); | |
407 | } | |
408 | ||
6888fc87 | 409 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4); |
a620c163 | 410 | |
80ff0fd3 DD |
411 | /* |
412 | * If we're sending faster than the receive can free them then | |
413 | * don't do the HW free. | |
414 | */ | |
4898c560 | 415 | if ((buffers_to_free < -100) && !pko_command.s.dontfree) |
80ff0fd3 | 416 | pko_command.s.dontfree = 1; |
80ff0fd3 | 417 | |
4898c560 | 418 | if (pko_command.s.dontfree) { |
6888fc87 | 419 | queue_type = QUEUE_CORE; |
4898c560 DD |
420 | pko_command.s.reg0 = priv->fau+qos*4; |
421 | } else { | |
6888fc87 | 422 | queue_type = QUEUE_HW; |
4898c560 DD |
423 | } |
424 | if (USE_ASYNC_IOBDMA) | |
425 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1); | |
6888fc87 DD |
426 | |
427 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); | |
80ff0fd3 DD |
428 | |
429 | /* Drop this packet if we have too many already queued to the HW */ | |
6888fc87 DD |
430 | if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= MAX_OUT_QUEUE_DEPTH)) { |
431 | if (dev->tx_queue_len != 0) { | |
432 | /* Drop the lock when notifying the core. */ | |
433 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); | |
434 | netif_stop_queue(dev); | |
6888fc87 | 435 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
6888fc87 DD |
436 | } else { |
437 | /* If not using normal queueing. */ | |
438 | queue_type = QUEUE_DROP; | |
439 | goto skip_xmit; | |
440 | } | |
80ff0fd3 | 441 | } |
6888fc87 DD |
442 | |
443 | cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos, | |
444 | CVMX_PKO_LOCK_NONE); | |
445 | ||
80ff0fd3 | 446 | /* Send the packet to the output queue */ |
6888fc87 DD |
447 | if (unlikely(cvmx_pko_send_packet_finish(priv->port, |
448 | priv->queue + qos, | |
449 | pko_command, hw_buffer, | |
450 | CVMX_PKO_LOCK_NONE))) { | |
7a2eaf93 | 451 | printk_ratelimited("%s: Failed to send the packet\n", dev->name); |
6888fc87 | 452 | queue_type = QUEUE_DROP; |
80ff0fd3 | 453 | } |
6888fc87 DD |
454 | skip_xmit: |
455 | to_free_list = NULL; | |
80ff0fd3 | 456 | |
6888fc87 DD |
457 | switch (queue_type) { |
458 | case QUEUE_DROP: | |
459 | skb->next = to_free_list; | |
460 | to_free_list = skb; | |
461 | priv->stats.tx_dropped++; | |
462 | break; | |
463 | case QUEUE_HW: | |
464 | cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1); | |
465 | break; | |
466 | case QUEUE_CORE: | |
467 | __skb_queue_tail(&priv->tx_free_list[qos], skb); | |
468 | break; | |
469 | default: | |
470 | BUG(); | |
80ff0fd3 DD |
471 | } |
472 | ||
6888fc87 DD |
473 | while (skb_to_free > 0) { |
474 | struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]); | |
475 | t->next = to_free_list; | |
476 | to_free_list = t; | |
477 | skb_to_free--; | |
80ff0fd3 DD |
478 | } |
479 | ||
6888fc87 DD |
480 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); |
481 | ||
482 | /* Do the actual freeing outside of the lock. */ | |
483 | while (to_free_list) { | |
484 | struct sk_buff *t = to_free_list; | |
485 | to_free_list = to_free_list->next; | |
486 | dev_kfree_skb_any(t); | |
487 | } | |
488 | ||
489 | if (USE_ASYNC_IOBDMA) { | |
4898c560 DD |
490 | CVMX_SYNCIOBDMA; |
491 | total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH); | |
6888fc87 DD |
492 | /* Restore the scratch area */ |
493 | cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch); | |
494 | cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2); | |
4898c560 DD |
495 | } else { |
496 | total_to_clean = cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1); | |
80ff0fd3 DD |
497 | } |
498 | ||
4898c560 DD |
499 | if (total_to_clean & 0x3ff) { |
500 | /* | |
501 | * Schedule the cleanup tasklet every 1024 packets for | |
502 | * the pathological case of high traffic on one port | |
503 | * delaying clean up of packets on a different port | |
504 | * that is blocked waiting for the cleanup. | |
505 | */ | |
506 | tasklet_schedule(&cvm_oct_tx_cleanup_tasklet); | |
507 | } | |
508 | ||
509 | cvm_oct_kick_tx_poll_watchdog(); | |
510 | ||
6888fc87 | 511 | return NETDEV_TX_OK; |
80ff0fd3 DD |
512 | } |
513 | ||
514 | /** | |
ec977c5b | 515 | * cvm_oct_xmit_pow - transmit a packet to the POW |
80ff0fd3 DD |
516 | * @skb: Packet to send |
517 | * @dev: Device info structure | |
ec977c5b | 518 | |
80ff0fd3 DD |
519 | * Returns Always returns zero |
520 | */ | |
521 | int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev) | |
522 | { | |
523 | struct octeon_ethernet *priv = netdev_priv(dev); | |
524 | void *packet_buffer; | |
525 | void *copy_location; | |
526 | ||
527 | /* Get a work queue entry */ | |
528 | cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL); | |
529 | if (unlikely(work == NULL)) { | |
7a2eaf93 CD |
530 | printk_ratelimited("%s: Failed to allocate a work " |
531 | "queue entry\n", dev->name); | |
80ff0fd3 DD |
532 | priv->stats.tx_dropped++; |
533 | dev_kfree_skb(skb); | |
534 | return 0; | |
535 | } | |
536 | ||
537 | /* Get a packet buffer */ | |
538 | packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL); | |
539 | if (unlikely(packet_buffer == NULL)) { | |
7a2eaf93 CD |
540 | printk_ratelimited("%s: Failed to allocate a packet buffer\n", |
541 | dev->name); | |
80ff0fd3 DD |
542 | cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1)); |
543 | priv->stats.tx_dropped++; | |
544 | dev_kfree_skb(skb); | |
545 | return 0; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Calculate where we need to copy the data to. We need to | |
550 | * leave 8 bytes for a next pointer (unused). We also need to | |
551 | * include any configure skip. Then we need to align the IP | |
552 | * packet src and dest into the same 64bit word. The below | |
553 | * calculation may add a little extra, but that doesn't | |
554 | * hurt. | |
555 | */ | |
556 | copy_location = packet_buffer + sizeof(uint64_t); | |
557 | copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6; | |
558 | ||
559 | /* | |
560 | * We have to copy the packet since whoever processes this | |
561 | * packet will free it to a hardware pool. We can't use the | |
562 | * trick of counting outstanding packets like in | |
563 | * cvm_oct_xmit. | |
564 | */ | |
565 | memcpy(copy_location, skb->data, skb->len); | |
566 | ||
567 | /* | |
568 | * Fill in some of the work queue fields. We may need to add | |
569 | * more if the software at the other end needs them. | |
570 | */ | |
571 | work->hw_chksum = skb->csum; | |
572 | work->len = skb->len; | |
573 | work->ipprt = priv->port; | |
574 | work->qos = priv->port & 0x7; | |
575 | work->grp = pow_send_group; | |
576 | work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE; | |
577 | work->tag = pow_send_group; /* FIXME */ | |
578 | /* Default to zero. Sets of zero later are commented out */ | |
579 | work->word2.u64 = 0; | |
580 | work->word2.s.bufs = 1; | |
581 | work->packet_ptr.u64 = 0; | |
582 | work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location); | |
583 | work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL; | |
584 | work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE; | |
585 | work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7; | |
586 | ||
587 | if (skb->protocol == htons(ETH_P_IP)) { | |
588 | work->word2.s.ip_offset = 14; | |
589 | #if 0 | |
590 | work->word2.s.vlan_valid = 0; /* FIXME */ | |
591 | work->word2.s.vlan_cfi = 0; /* FIXME */ | |
592 | work->word2.s.vlan_id = 0; /* FIXME */ | |
593 | work->word2.s.dec_ipcomp = 0; /* FIXME */ | |
594 | #endif | |
595 | work->word2.s.tcp_or_udp = | |
081f6749 DD |
596 | (ip_hdr(skb)->protocol == IPPROTO_TCP) |
597 | || (ip_hdr(skb)->protocol == IPPROTO_UDP); | |
80ff0fd3 DD |
598 | #if 0 |
599 | /* FIXME */ | |
600 | work->word2.s.dec_ipsec = 0; | |
601 | /* We only support IPv4 right now */ | |
602 | work->word2.s.is_v6 = 0; | |
603 | /* Hardware would set to zero */ | |
604 | work->word2.s.software = 0; | |
605 | /* No error, packet is internal */ | |
606 | work->word2.s.L4_error = 0; | |
607 | #endif | |
608 | work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) | |
609 | || (ip_hdr(skb)->frag_off == | |
610 | 1 << 14)); | |
611 | #if 0 | |
612 | /* Assume Linux is sending a good packet */ | |
613 | work->word2.s.IP_exc = 0; | |
614 | #endif | |
615 | work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST); | |
616 | work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST); | |
617 | #if 0 | |
618 | /* This is an IP packet */ | |
619 | work->word2.s.not_IP = 0; | |
620 | /* No error, packet is internal */ | |
621 | work->word2.s.rcv_error = 0; | |
622 | /* No error, packet is internal */ | |
623 | work->word2.s.err_code = 0; | |
624 | #endif | |
625 | ||
626 | /* | |
627 | * When copying the data, include 4 bytes of the | |
628 | * ethernet header to align the same way hardware | |
629 | * does. | |
630 | */ | |
631 | memcpy(work->packet_data, skb->data + 10, | |
632 | sizeof(work->packet_data)); | |
633 | } else { | |
634 | #if 0 | |
635 | work->word2.snoip.vlan_valid = 0; /* FIXME */ | |
636 | work->word2.snoip.vlan_cfi = 0; /* FIXME */ | |
637 | work->word2.snoip.vlan_id = 0; /* FIXME */ | |
638 | work->word2.snoip.software = 0; /* Hardware would set to zero */ | |
639 | #endif | |
640 | work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP); | |
641 | work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP); | |
642 | work->word2.snoip.is_bcast = | |
643 | (skb->pkt_type == PACKET_BROADCAST); | |
644 | work->word2.snoip.is_mcast = | |
645 | (skb->pkt_type == PACKET_MULTICAST); | |
646 | work->word2.snoip.not_IP = 1; /* IP was done up above */ | |
647 | #if 0 | |
648 | /* No error, packet is internal */ | |
649 | work->word2.snoip.rcv_error = 0; | |
650 | /* No error, packet is internal */ | |
651 | work->word2.snoip.err_code = 0; | |
652 | #endif | |
653 | memcpy(work->packet_data, skb->data, sizeof(work->packet_data)); | |
654 | } | |
655 | ||
656 | /* Submit the packet to the POW */ | |
657 | cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos, | |
658 | work->grp); | |
659 | priv->stats.tx_packets++; | |
660 | priv->stats.tx_bytes += skb->len; | |
661 | dev_kfree_skb(skb); | |
662 | return 0; | |
663 | } | |
664 | ||
80ff0fd3 | 665 | /** |
ec977c5b | 666 | * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX. |
80ff0fd3 | 667 | * @dev: Device being shutdown |
ec977c5b | 668 | * |
80ff0fd3 | 669 | */ |
4898c560 | 670 | void cvm_oct_tx_shutdown_dev(struct net_device *dev) |
80ff0fd3 DD |
671 | { |
672 | struct octeon_ethernet *priv = netdev_priv(dev); | |
673 | unsigned long flags; | |
674 | int qos; | |
675 | ||
676 | for (qos = 0; qos < 16; qos++) { | |
677 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); | |
678 | while (skb_queue_len(&priv->tx_free_list[qos])) | |
679 | dev_kfree_skb_any(__skb_dequeue | |
680 | (&priv->tx_free_list[qos])); | |
681 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); | |
682 | } | |
683 | } | |
4898c560 DD |
684 | |
685 | static void cvm_oct_tx_do_cleanup(unsigned long arg) | |
686 | { | |
687 | int port; | |
688 | ||
689 | for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) { | |
690 | if (cvm_oct_device[port]) { | |
691 | struct net_device *dev = cvm_oct_device[port]; | |
692 | cvm_oct_free_tx_skbs(dev); | |
693 | } | |
694 | } | |
695 | } | |
696 | ||
697 | static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id) | |
698 | { | |
699 | /* Disable the interrupt. */ | |
700 | cvmx_write_csr(CVMX_CIU_TIMX(1), 0); | |
701 | /* Do the work in the tasklet. */ | |
702 | tasklet_schedule(&cvm_oct_tx_cleanup_tasklet); | |
703 | return IRQ_HANDLED; | |
704 | } | |
705 | ||
706 | void cvm_oct_tx_initialize(void) | |
707 | { | |
708 | int i; | |
709 | ||
710 | /* Disable the interrupt. */ | |
711 | cvmx_write_csr(CVMX_CIU_TIMX(1), 0); | |
712 | /* Register an IRQ hander for to receive CIU_TIMX(1) interrupts */ | |
713 | i = request_irq(OCTEON_IRQ_TIMER1, | |
714 | cvm_oct_tx_cleanup_watchdog, 0, | |
715 | "Ethernet", cvm_oct_device); | |
716 | ||
717 | if (i) | |
718 | panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1); | |
719 | } | |
720 | ||
721 | void cvm_oct_tx_shutdown(void) | |
722 | { | |
723 | /* Free the interrupt handler */ | |
724 | free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device); | |
725 | } |