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8199d3a7 CL |
1 | /***************************************************************************** |
2 | * * | |
3 | * File: sge.c * | |
559fb51b SB |
4 | * $Revision: 1.26 $ * |
5 | * $Date: 2005/06/21 18:29:48 $ * | |
8199d3a7 CL |
6 | * Description: * |
7 | * DMA engine. * | |
8 | * part of the Chelsio 10Gb Ethernet Driver. * | |
9 | * * | |
10 | * This program is free software; you can redistribute it and/or modify * | |
11 | * it under the terms of the GNU General Public License, version 2, as * | |
12 | * published by the Free Software Foundation. * | |
13 | * * | |
14 | * You should have received a copy of the GNU General Public License along * | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., * | |
16 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * | |
17 | * * | |
18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * | |
19 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * | |
20 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * | |
21 | * * | |
22 | * http://www.chelsio.com * | |
23 | * * | |
24 | * Copyright (c) 2003 - 2005 Chelsio Communications, Inc. * | |
25 | * All rights reserved. * | |
26 | * * | |
27 | * Maintainers: maintainers@chelsio.com * | |
28 | * * | |
29 | * Authors: Dimitrios Michailidis <dm@chelsio.com> * | |
30 | * Tina Yang <tainay@chelsio.com> * | |
31 | * Felix Marti <felix@chelsio.com> * | |
32 | * Scott Bardone <sbardone@chelsio.com> * | |
33 | * Kurt Ottaway <kottaway@chelsio.com> * | |
34 | * Frank DiMambro <frank@chelsio.com> * | |
35 | * * | |
36 | * History: * | |
37 | * * | |
38 | ****************************************************************************/ | |
39 | ||
40 | #include "common.h" | |
41 | ||
8199d3a7 CL |
42 | #include <linux/types.h> |
43 | #include <linux/errno.h> | |
44 | #include <linux/pci.h> | |
f1d3d38a | 45 | #include <linux/ktime.h> |
8199d3a7 CL |
46 | #include <linux/netdevice.h> |
47 | #include <linux/etherdevice.h> | |
48 | #include <linux/if_vlan.h> | |
49 | #include <linux/skbuff.h> | |
50 | #include <linux/init.h> | |
51 | #include <linux/mm.h> | |
f1d3d38a | 52 | #include <linux/tcp.h> |
8199d3a7 CL |
53 | #include <linux/ip.h> |
54 | #include <linux/in.h> | |
55 | #include <linux/if_arp.h> | |
56 | ||
57 | #include "cpl5_cmd.h" | |
58 | #include "sge.h" | |
59 | #include "regs.h" | |
60 | #include "espi.h" | |
61 | ||
f1d3d38a SH |
62 | /* This belongs in if_ether.h */ |
63 | #define ETH_P_CPL5 0xf | |
8199d3a7 CL |
64 | |
65 | #define SGE_CMDQ_N 2 | |
66 | #define SGE_FREELQ_N 2 | |
559fb51b | 67 | #define SGE_CMDQ0_E_N 1024 |
8199d3a7 CL |
68 | #define SGE_CMDQ1_E_N 128 |
69 | #define SGE_FREEL_SIZE 4096 | |
70 | #define SGE_JUMBO_FREEL_SIZE 512 | |
71 | #define SGE_FREEL_REFILL_THRESH 16 | |
72 | #define SGE_RESPQ_E_N 1024 | |
559fb51b | 73 | #define SGE_INTRTIMER_NRES 1000 |
8199d3a7 | 74 | #define SGE_RX_SM_BUF_SIZE 1536 |
f1d3d38a | 75 | #define SGE_TX_DESC_MAX_PLEN 16384 |
8199d3a7 | 76 | |
559fb51b SB |
77 | #define SGE_RESPQ_REPLENISH_THRES (SGE_RESPQ_E_N / 4) |
78 | ||
79 | /* | |
80 | * Period of the TX buffer reclaim timer. This timer does not need to run | |
81 | * frequently as TX buffers are usually reclaimed by new TX packets. | |
82 | */ | |
83 | #define TX_RECLAIM_PERIOD (HZ / 4) | |
8199d3a7 | 84 | |
559fb51b SB |
85 | #define M_CMD_LEN 0x7fffffff |
86 | #define V_CMD_LEN(v) (v) | |
87 | #define G_CMD_LEN(v) ((v) & M_CMD_LEN) | |
88 | #define V_CMD_GEN1(v) ((v) << 31) | |
89 | #define V_CMD_GEN2(v) (v) | |
90 | #define F_CMD_DATAVALID (1 << 1) | |
91 | #define F_CMD_SOP (1 << 2) | |
92 | #define V_CMD_EOP(v) ((v) << 3) | |
93 | ||
8199d3a7 | 94 | /* |
559fb51b | 95 | * Command queue, receive buffer list, and response queue descriptors. |
8199d3a7 CL |
96 | */ |
97 | #if defined(__BIG_ENDIAN_BITFIELD) | |
98 | struct cmdQ_e { | |
559fb51b SB |
99 | u32 addr_lo; |
100 | u32 len_gen; | |
101 | u32 flags; | |
102 | u32 addr_hi; | |
8199d3a7 CL |
103 | }; |
104 | ||
105 | struct freelQ_e { | |
559fb51b SB |
106 | u32 addr_lo; |
107 | u32 len_gen; | |
108 | u32 gen2; | |
109 | u32 addr_hi; | |
8199d3a7 CL |
110 | }; |
111 | ||
112 | struct respQ_e { | |
113 | u32 Qsleeping : 4; | |
114 | u32 Cmdq1CreditReturn : 5; | |
115 | u32 Cmdq1DmaComplete : 5; | |
116 | u32 Cmdq0CreditReturn : 5; | |
117 | u32 Cmdq0DmaComplete : 5; | |
118 | u32 FreelistQid : 2; | |
119 | u32 CreditValid : 1; | |
120 | u32 DataValid : 1; | |
121 | u32 Offload : 1; | |
122 | u32 Eop : 1; | |
123 | u32 Sop : 1; | |
124 | u32 GenerationBit : 1; | |
125 | u32 BufferLength; | |
126 | }; | |
8199d3a7 CL |
127 | #elif defined(__LITTLE_ENDIAN_BITFIELD) |
128 | struct cmdQ_e { | |
559fb51b SB |
129 | u32 len_gen; |
130 | u32 addr_lo; | |
131 | u32 addr_hi; | |
132 | u32 flags; | |
8199d3a7 CL |
133 | }; |
134 | ||
135 | struct freelQ_e { | |
559fb51b SB |
136 | u32 len_gen; |
137 | u32 addr_lo; | |
138 | u32 addr_hi; | |
139 | u32 gen2; | |
8199d3a7 CL |
140 | }; |
141 | ||
142 | struct respQ_e { | |
143 | u32 BufferLength; | |
144 | u32 GenerationBit : 1; | |
145 | u32 Sop : 1; | |
146 | u32 Eop : 1; | |
147 | u32 Offload : 1; | |
148 | u32 DataValid : 1; | |
149 | u32 CreditValid : 1; | |
150 | u32 FreelistQid : 2; | |
151 | u32 Cmdq0DmaComplete : 5; | |
152 | u32 Cmdq0CreditReturn : 5; | |
153 | u32 Cmdq1DmaComplete : 5; | |
154 | u32 Cmdq1CreditReturn : 5; | |
155 | u32 Qsleeping : 4; | |
156 | } ; | |
157 | #endif | |
158 | ||
159 | /* | |
160 | * SW Context Command and Freelist Queue Descriptors | |
161 | */ | |
162 | struct cmdQ_ce { | |
163 | struct sk_buff *skb; | |
164 | DECLARE_PCI_UNMAP_ADDR(dma_addr); | |
165 | DECLARE_PCI_UNMAP_LEN(dma_len); | |
8199d3a7 CL |
166 | }; |
167 | ||
168 | struct freelQ_ce { | |
169 | struct sk_buff *skb; | |
170 | DECLARE_PCI_UNMAP_ADDR(dma_addr); | |
171 | DECLARE_PCI_UNMAP_LEN(dma_len); | |
172 | }; | |
173 | ||
174 | /* | |
559fb51b | 175 | * SW command, freelist and response rings |
8199d3a7 CL |
176 | */ |
177 | struct cmdQ { | |
559fb51b SB |
178 | unsigned long status; /* HW DMA fetch status */ |
179 | unsigned int in_use; /* # of in-use command descriptors */ | |
180 | unsigned int size; /* # of descriptors */ | |
f1d3d38a SH |
181 | unsigned int processed; /* total # of descs HW has processed */ |
182 | unsigned int cleaned; /* total # of descs SW has reclaimed */ | |
183 | unsigned int stop_thres; /* SW TX queue suspend threshold */ | |
559fb51b SB |
184 | u16 pidx; /* producer index (SW) */ |
185 | u16 cidx; /* consumer index (HW) */ | |
186 | u8 genbit; /* current generation (=valid) bit */ | |
f1d3d38a | 187 | u8 sop; /* is next entry start of packet? */ |
559fb51b SB |
188 | struct cmdQ_e *entries; /* HW command descriptor Q */ |
189 | struct cmdQ_ce *centries; /* SW command context descriptor Q */ | |
559fb51b | 190 | dma_addr_t dma_addr; /* DMA addr HW command descriptor Q */ |
356bd146 | 191 | spinlock_t lock; /* Lock to protect cmdQ enqueuing */ |
8199d3a7 CL |
192 | }; |
193 | ||
194 | struct freelQ { | |
559fb51b SB |
195 | unsigned int credits; /* # of available RX buffers */ |
196 | unsigned int size; /* free list capacity */ | |
197 | u16 pidx; /* producer index (SW) */ | |
198 | u16 cidx; /* consumer index (HW) */ | |
8199d3a7 | 199 | u16 rx_buffer_size; /* Buffer size on this free list */ |
f1d3d38a SH |
200 | u16 dma_offset; /* DMA offset to align IP headers */ |
201 | u16 recycleq_idx; /* skb recycle q to use */ | |
559fb51b SB |
202 | u8 genbit; /* current generation (=valid) bit */ |
203 | struct freelQ_e *entries; /* HW freelist descriptor Q */ | |
204 | struct freelQ_ce *centries; /* SW freelist context descriptor Q */ | |
205 | dma_addr_t dma_addr; /* DMA addr HW freelist descriptor Q */ | |
8199d3a7 CL |
206 | }; |
207 | ||
208 | struct respQ { | |
559fb51b SB |
209 | unsigned int credits; /* credits to be returned to SGE */ |
210 | unsigned int size; /* # of response Q descriptors */ | |
211 | u16 cidx; /* consumer index (SW) */ | |
212 | u8 genbit; /* current generation(=valid) bit */ | |
8199d3a7 | 213 | struct respQ_e *entries; /* HW response descriptor Q */ |
559fb51b SB |
214 | dma_addr_t dma_addr; /* DMA addr HW response descriptor Q */ |
215 | }; | |
216 | ||
217 | /* Bit flags for cmdQ.status */ | |
218 | enum { | |
219 | CMDQ_STAT_RUNNING = 1, /* fetch engine is running */ | |
220 | CMDQ_STAT_LAST_PKT_DB = 2 /* last packet rung the doorbell */ | |
8199d3a7 CL |
221 | }; |
222 | ||
f1d3d38a SH |
223 | /* T204 TX SW scheduler */ |
224 | ||
225 | /* Per T204 TX port */ | |
226 | struct sched_port { | |
227 | unsigned int avail; /* available bits - quota */ | |
228 | unsigned int drain_bits_per_1024ns; /* drain rate */ | |
229 | unsigned int speed; /* drain rate, mbps */ | |
230 | unsigned int mtu; /* mtu size */ | |
231 | struct sk_buff_head skbq; /* pending skbs */ | |
232 | }; | |
233 | ||
234 | /* Per T204 device */ | |
235 | struct sched { | |
236 | ktime_t last_updated; /* last time quotas were computed */ | |
356bd146 FR |
237 | unsigned int max_avail; /* max bits to be sent to any port */ |
238 | unsigned int port; /* port index (round robin ports) */ | |
239 | unsigned int num; /* num skbs in per port queues */ | |
f1d3d38a SH |
240 | struct sched_port p[MAX_NPORTS]; |
241 | struct tasklet_struct sched_tsk;/* tasklet used to run scheduler */ | |
242 | }; | |
243 | static void restart_sched(unsigned long); | |
244 | ||
245 | ||
8199d3a7 CL |
246 | /* |
247 | * Main SGE data structure | |
248 | * | |
249 | * Interrupts are handled by a single CPU and it is likely that on a MP system | |
250 | * the application is migrated to another CPU. In that scenario, we try to | |
251 | * seperate the RX(in irq context) and TX state in order to decrease memory | |
252 | * contention. | |
253 | */ | |
254 | struct sge { | |
356bd146 | 255 | struct adapter *adapter; /* adapter backpointer */ |
559fb51b | 256 | struct net_device *netdev; /* netdevice backpointer */ |
356bd146 FR |
257 | struct freelQ freelQ[SGE_FREELQ_N]; /* buffer free lists */ |
258 | struct respQ respQ; /* response Q */ | |
559fb51b | 259 | unsigned long stopped_tx_queues; /* bitmap of suspended Tx queues */ |
8199d3a7 CL |
260 | unsigned int rx_pkt_pad; /* RX padding for L2 packets */ |
261 | unsigned int jumbo_fl; /* jumbo freelist Q index */ | |
559fb51b | 262 | unsigned int intrtimer_nres; /* no-resource interrupt timer */ |
f1d3d38a | 263 | unsigned int fixed_intrtimer;/* non-adaptive interrupt timer */ |
559fb51b SB |
264 | struct timer_list tx_reclaim_timer; /* reclaims TX buffers */ |
265 | struct timer_list espibug_timer; | |
f1d3d38a SH |
266 | unsigned long espibug_timeout; |
267 | struct sk_buff *espibug_skb[MAX_NPORTS]; | |
559fb51b SB |
268 | u32 sge_control; /* shadow value of sge control reg */ |
269 | struct sge_intr_counts stats; | |
56f643c2 | 270 | struct sge_port_stats *port_stats[MAX_NPORTS]; |
f1d3d38a | 271 | struct sched *tx_sched; |
559fb51b | 272 | struct cmdQ cmdQ[SGE_CMDQ_N] ____cacheline_aligned_in_smp; |
8199d3a7 CL |
273 | }; |
274 | ||
f1d3d38a SH |
275 | /* |
276 | * stop tasklet and free all pending skb's | |
277 | */ | |
278 | static void tx_sched_stop(struct sge *sge) | |
279 | { | |
280 | struct sched *s = sge->tx_sched; | |
281 | int i; | |
282 | ||
283 | tasklet_kill(&s->sched_tsk); | |
284 | ||
285 | for (i = 0; i < MAX_NPORTS; i++) | |
286 | __skb_queue_purge(&s->p[s->port].skbq); | |
287 | } | |
288 | ||
289 | /* | |
290 | * t1_sched_update_parms() is called when the MTU or link speed changes. It | |
291 | * re-computes scheduler parameters to scope with the change. | |
292 | */ | |
293 | unsigned int t1_sched_update_parms(struct sge *sge, unsigned int port, | |
294 | unsigned int mtu, unsigned int speed) | |
295 | { | |
296 | struct sched *s = sge->tx_sched; | |
297 | struct sched_port *p = &s->p[port]; | |
298 | unsigned int max_avail_segs; | |
299 | ||
300 | pr_debug("t1_sched_update_params mtu=%d speed=%d\n", mtu, speed); | |
301 | if (speed) | |
302 | p->speed = speed; | |
303 | if (mtu) | |
304 | p->mtu = mtu; | |
305 | ||
306 | if (speed || mtu) { | |
307 | unsigned long long drain = 1024ULL * p->speed * (p->mtu - 40); | |
308 | do_div(drain, (p->mtu + 50) * 1000); | |
309 | p->drain_bits_per_1024ns = (unsigned int) drain; | |
310 | ||
311 | if (p->speed < 1000) | |
312 | p->drain_bits_per_1024ns = | |
313 | 90 * p->drain_bits_per_1024ns / 100; | |
314 | } | |
315 | ||
316 | if (board_info(sge->adapter)->board == CHBT_BOARD_CHT204) { | |
317 | p->drain_bits_per_1024ns -= 16; | |
318 | s->max_avail = max(4096U, p->mtu + 16 + 14 + 4); | |
319 | max_avail_segs = max(1U, 4096 / (p->mtu - 40)); | |
320 | } else { | |
321 | s->max_avail = 16384; | |
322 | max_avail_segs = max(1U, 9000 / (p->mtu - 40)); | |
323 | } | |
324 | ||
325 | pr_debug("t1_sched_update_parms: mtu %u speed %u max_avail %u " | |
326 | "max_avail_segs %u drain_bits_per_1024ns %u\n", p->mtu, | |
327 | p->speed, s->max_avail, max_avail_segs, | |
328 | p->drain_bits_per_1024ns); | |
329 | ||
330 | return max_avail_segs * (p->mtu - 40); | |
331 | } | |
332 | ||
333 | /* | |
334 | * t1_sched_max_avail_bytes() tells the scheduler the maximum amount of | |
335 | * data that can be pushed per port. | |
336 | */ | |
337 | void t1_sched_set_max_avail_bytes(struct sge *sge, unsigned int val) | |
338 | { | |
339 | struct sched *s = sge->tx_sched; | |
340 | unsigned int i; | |
341 | ||
342 | s->max_avail = val; | |
343 | for (i = 0; i < MAX_NPORTS; i++) | |
344 | t1_sched_update_parms(sge, i, 0, 0); | |
345 | } | |
346 | ||
347 | /* | |
348 | * t1_sched_set_drain_bits_per_us() tells the scheduler at which rate a port | |
349 | * is draining. | |
350 | */ | |
351 | void t1_sched_set_drain_bits_per_us(struct sge *sge, unsigned int port, | |
352 | unsigned int val) | |
353 | { | |
354 | struct sched *s = sge->tx_sched; | |
355 | struct sched_port *p = &s->p[port]; | |
356 | p->drain_bits_per_1024ns = val * 1024 / 1000; | |
357 | t1_sched_update_parms(sge, port, 0, 0); | |
358 | } | |
359 | ||
360 | ||
361 | /* | |
362 | * get_clock() implements a ns clock (see ktime_get) | |
363 | */ | |
364 | static inline ktime_t get_clock(void) | |
365 | { | |
366 | struct timespec ts; | |
367 | ||
368 | ktime_get_ts(&ts); | |
369 | return timespec_to_ktime(ts); | |
370 | } | |
371 | ||
372 | /* | |
373 | * tx_sched_init() allocates resources and does basic initialization. | |
374 | */ | |
375 | static int tx_sched_init(struct sge *sge) | |
376 | { | |
377 | struct sched *s; | |
378 | int i; | |
379 | ||
380 | s = kzalloc(sizeof (struct sched), GFP_KERNEL); | |
381 | if (!s) | |
382 | return -ENOMEM; | |
383 | ||
384 | pr_debug("tx_sched_init\n"); | |
385 | tasklet_init(&s->sched_tsk, restart_sched, (unsigned long) sge); | |
386 | sge->tx_sched = s; | |
387 | ||
388 | for (i = 0; i < MAX_NPORTS; i++) { | |
389 | skb_queue_head_init(&s->p[i].skbq); | |
390 | t1_sched_update_parms(sge, i, 1500, 1000); | |
391 | } | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | /* | |
397 | * sched_update_avail() computes the delta since the last time it was called | |
398 | * and updates the per port quota (number of bits that can be sent to the any | |
399 | * port). | |
400 | */ | |
401 | static inline int sched_update_avail(struct sge *sge) | |
402 | { | |
403 | struct sched *s = sge->tx_sched; | |
404 | ktime_t now = get_clock(); | |
405 | unsigned int i; | |
406 | long long delta_time_ns; | |
407 | ||
408 | delta_time_ns = ktime_to_ns(ktime_sub(now, s->last_updated)); | |
409 | ||
410 | pr_debug("sched_update_avail delta=%lld\n", delta_time_ns); | |
411 | if (delta_time_ns < 15000) | |
412 | return 0; | |
413 | ||
414 | for (i = 0; i < MAX_NPORTS; i++) { | |
415 | struct sched_port *p = &s->p[i]; | |
416 | unsigned int delta_avail; | |
417 | ||
418 | delta_avail = (p->drain_bits_per_1024ns * delta_time_ns) >> 13; | |
419 | p->avail = min(p->avail + delta_avail, s->max_avail); | |
420 | } | |
421 | ||
422 | s->last_updated = now; | |
423 | ||
424 | return 1; | |
425 | } | |
426 | ||
427 | /* | |
428 | * sched_skb() is called from two different places. In the tx path, any | |
429 | * packet generating load on an output port will call sched_skb() | |
430 | * (skb != NULL). In addition, sched_skb() is called from the irq/soft irq | |
431 | * context (skb == NULL). | |
432 | * The scheduler only returns a skb (which will then be sent) if the | |
433 | * length of the skb is <= the current quota of the output port. | |
434 | */ | |
435 | static struct sk_buff *sched_skb(struct sge *sge, struct sk_buff *skb, | |
436 | unsigned int credits) | |
437 | { | |
438 | struct sched *s = sge->tx_sched; | |
439 | struct sk_buff_head *skbq; | |
440 | unsigned int i, len, update = 1; | |
441 | ||
442 | pr_debug("sched_skb %p\n", skb); | |
443 | if (!skb) { | |
444 | if (!s->num) | |
445 | return NULL; | |
446 | } else { | |
447 | skbq = &s->p[skb->dev->if_port].skbq; | |
448 | __skb_queue_tail(skbq, skb); | |
449 | s->num++; | |
450 | skb = NULL; | |
451 | } | |
452 | ||
453 | if (credits < MAX_SKB_FRAGS + 1) | |
454 | goto out; | |
455 | ||
356bd146 | 456 | again: |
f1d3d38a SH |
457 | for (i = 0; i < MAX_NPORTS; i++) { |
458 | s->port = ++s->port & (MAX_NPORTS - 1); | |
459 | skbq = &s->p[s->port].skbq; | |
460 | ||
461 | skb = skb_peek(skbq); | |
462 | ||
463 | if (!skb) | |
464 | continue; | |
465 | ||
466 | len = skb->len; | |
467 | if (len <= s->p[s->port].avail) { | |
468 | s->p[s->port].avail -= len; | |
469 | s->num--; | |
470 | __skb_unlink(skb, skbq); | |
471 | goto out; | |
472 | } | |
473 | skb = NULL; | |
474 | } | |
475 | ||
476 | if (update-- && sched_update_avail(sge)) | |
477 | goto again; | |
478 | ||
356bd146 FR |
479 | out: |
480 | /* If there are more pending skbs, we use the hardware to schedule us | |
f1d3d38a SH |
481 | * again. |
482 | */ | |
483 | if (s->num && !skb) { | |
484 | struct cmdQ *q = &sge->cmdQ[0]; | |
485 | clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); | |
486 | if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { | |
487 | set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); | |
488 | writel(F_CMDQ0_ENABLE, sge->adapter->regs + A_SG_DOORBELL); | |
489 | } | |
490 | } | |
491 | pr_debug("sched_skb ret %p\n", skb); | |
492 | ||
493 | return skb; | |
494 | } | |
495 | ||
8199d3a7 CL |
496 | /* |
497 | * PIO to indicate that memory mapped Q contains valid descriptor(s). | |
498 | */ | |
559fb51b | 499 | static inline void doorbell_pio(struct adapter *adapter, u32 val) |
8199d3a7 CL |
500 | { |
501 | wmb(); | |
559fb51b | 502 | writel(val, adapter->regs + A_SG_DOORBELL); |
8199d3a7 CL |
503 | } |
504 | ||
505 | /* | |
506 | * Frees all RX buffers on the freelist Q. The caller must make sure that | |
507 | * the SGE is turned off before calling this function. | |
508 | */ | |
559fb51b | 509 | static void free_freelQ_buffers(struct pci_dev *pdev, struct freelQ *q) |
8199d3a7 | 510 | { |
559fb51b | 511 | unsigned int cidx = q->cidx; |
8199d3a7 | 512 | |
559fb51b SB |
513 | while (q->credits--) { |
514 | struct freelQ_ce *ce = &q->centries[cidx]; | |
8199d3a7 CL |
515 | |
516 | pci_unmap_single(pdev, pci_unmap_addr(ce, dma_addr), | |
517 | pci_unmap_len(ce, dma_len), | |
518 | PCI_DMA_FROMDEVICE); | |
519 | dev_kfree_skb(ce->skb); | |
520 | ce->skb = NULL; | |
559fb51b | 521 | if (++cidx == q->size) |
8199d3a7 CL |
522 | cidx = 0; |
523 | } | |
524 | } | |
525 | ||
526 | /* | |
527 | * Free RX free list and response queue resources. | |
528 | */ | |
529 | static void free_rx_resources(struct sge *sge) | |
530 | { | |
531 | struct pci_dev *pdev = sge->adapter->pdev; | |
532 | unsigned int size, i; | |
533 | ||
534 | if (sge->respQ.entries) { | |
559fb51b | 535 | size = sizeof(struct respQ_e) * sge->respQ.size; |
8199d3a7 CL |
536 | pci_free_consistent(pdev, size, sge->respQ.entries, |
537 | sge->respQ.dma_addr); | |
538 | } | |
539 | ||
540 | for (i = 0; i < SGE_FREELQ_N; i++) { | |
559fb51b | 541 | struct freelQ *q = &sge->freelQ[i]; |
8199d3a7 | 542 | |
559fb51b SB |
543 | if (q->centries) { |
544 | free_freelQ_buffers(pdev, q); | |
545 | kfree(q->centries); | |
8199d3a7 | 546 | } |
559fb51b SB |
547 | if (q->entries) { |
548 | size = sizeof(struct freelQ_e) * q->size; | |
549 | pci_free_consistent(pdev, size, q->entries, | |
550 | q->dma_addr); | |
8199d3a7 CL |
551 | } |
552 | } | |
553 | } | |
554 | ||
555 | /* | |
556 | * Allocates basic RX resources, consisting of memory mapped freelist Qs and a | |
559fb51b | 557 | * response queue. |
8199d3a7 CL |
558 | */ |
559 | static int alloc_rx_resources(struct sge *sge, struct sge_params *p) | |
560 | { | |
561 | struct pci_dev *pdev = sge->adapter->pdev; | |
562 | unsigned int size, i; | |
563 | ||
564 | for (i = 0; i < SGE_FREELQ_N; i++) { | |
559fb51b SB |
565 | struct freelQ *q = &sge->freelQ[i]; |
566 | ||
567 | q->genbit = 1; | |
568 | q->size = p->freelQ_size[i]; | |
569 | q->dma_offset = sge->rx_pkt_pad ? 0 : NET_IP_ALIGN; | |
570 | size = sizeof(struct freelQ_e) * q->size; | |
3e0f75be | 571 | q->entries = pci_alloc_consistent(pdev, size, &q->dma_addr); |
559fb51b | 572 | if (!q->entries) |
8199d3a7 | 573 | goto err_no_mem; |
3e0f75be | 574 | |
559fb51b | 575 | size = sizeof(struct freelQ_ce) * q->size; |
cbee9f91 | 576 | q->centries = kzalloc(size, GFP_KERNEL); |
559fb51b | 577 | if (!q->centries) |
8199d3a7 CL |
578 | goto err_no_mem; |
579 | } | |
580 | ||
581 | /* | |
582 | * Calculate the buffer sizes for the two free lists. FL0 accommodates | |
583 | * regular sized Ethernet frames, FL1 is sized not to exceed 16K, | |
584 | * including all the sk_buff overhead. | |
585 | * | |
586 | * Note: For T2 FL0 and FL1 are reversed. | |
587 | */ | |
588 | sge->freelQ[!sge->jumbo_fl].rx_buffer_size = SGE_RX_SM_BUF_SIZE + | |
589 | sizeof(struct cpl_rx_data) + | |
590 | sge->freelQ[!sge->jumbo_fl].dma_offset; | |
f1d3d38a SH |
591 | |
592 | size = (16 * 1024) - | |
593 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
594 | ||
595 | sge->freelQ[sge->jumbo_fl].rx_buffer_size = size; | |
8199d3a7 | 596 | |
559fb51b SB |
597 | /* |
598 | * Setup which skb recycle Q should be used when recycling buffers from | |
599 | * each free list. | |
600 | */ | |
601 | sge->freelQ[!sge->jumbo_fl].recycleq_idx = 0; | |
602 | sge->freelQ[sge->jumbo_fl].recycleq_idx = 1; | |
603 | ||
8199d3a7 | 604 | sge->respQ.genbit = 1; |
559fb51b SB |
605 | sge->respQ.size = SGE_RESPQ_E_N; |
606 | sge->respQ.credits = 0; | |
607 | size = sizeof(struct respQ_e) * sge->respQ.size; | |
3e0f75be | 608 | sge->respQ.entries = |
8199d3a7 CL |
609 | pci_alloc_consistent(pdev, size, &sge->respQ.dma_addr); |
610 | if (!sge->respQ.entries) | |
611 | goto err_no_mem; | |
8199d3a7 CL |
612 | return 0; |
613 | ||
614 | err_no_mem: | |
615 | free_rx_resources(sge); | |
616 | return -ENOMEM; | |
617 | } | |
618 | ||
619 | /* | |
559fb51b | 620 | * Reclaims n TX descriptors and frees the buffers associated with them. |
8199d3a7 | 621 | */ |
559fb51b | 622 | static void free_cmdQ_buffers(struct sge *sge, struct cmdQ *q, unsigned int n) |
8199d3a7 | 623 | { |
559fb51b | 624 | struct cmdQ_ce *ce; |
8199d3a7 | 625 | struct pci_dev *pdev = sge->adapter->pdev; |
559fb51b | 626 | unsigned int cidx = q->cidx; |
8199d3a7 | 627 | |
559fb51b SB |
628 | q->in_use -= n; |
629 | ce = &q->centries[cidx]; | |
630 | while (n--) { | |
3e0f75be FR |
631 | if (likely(pci_unmap_len(ce, dma_len))) { |
632 | pci_unmap_single(pdev, pci_unmap_addr(ce, dma_addr), | |
633 | pci_unmap_len(ce, dma_len), | |
634 | PCI_DMA_TODEVICE); | |
635 | if (q->sop) | |
f1d3d38a | 636 | q->sop = 0; |
f1d3d38a | 637 | } |
559fb51b | 638 | if (ce->skb) { |
f1d3d38a | 639 | dev_kfree_skb_any(ce->skb); |
559fb51b SB |
640 | q->sop = 1; |
641 | } | |
8199d3a7 | 642 | ce++; |
559fb51b | 643 | if (++cidx == q->size) { |
8199d3a7 | 644 | cidx = 0; |
559fb51b | 645 | ce = q->centries; |
8199d3a7 CL |
646 | } |
647 | } | |
559fb51b | 648 | q->cidx = cidx; |
8199d3a7 CL |
649 | } |
650 | ||
651 | /* | |
652 | * Free TX resources. | |
653 | * | |
654 | * Assumes that SGE is stopped and all interrupts are disabled. | |
655 | */ | |
656 | static void free_tx_resources(struct sge *sge) | |
657 | { | |
658 | struct pci_dev *pdev = sge->adapter->pdev; | |
659 | unsigned int size, i; | |
660 | ||
661 | for (i = 0; i < SGE_CMDQ_N; i++) { | |
559fb51b | 662 | struct cmdQ *q = &sge->cmdQ[i]; |
8199d3a7 | 663 | |
559fb51b SB |
664 | if (q->centries) { |
665 | if (q->in_use) | |
666 | free_cmdQ_buffers(sge, q, q->in_use); | |
667 | kfree(q->centries); | |
8199d3a7 | 668 | } |
559fb51b SB |
669 | if (q->entries) { |
670 | size = sizeof(struct cmdQ_e) * q->size; | |
671 | pci_free_consistent(pdev, size, q->entries, | |
672 | q->dma_addr); | |
8199d3a7 CL |
673 | } |
674 | } | |
675 | } | |
676 | ||
677 | /* | |
678 | * Allocates basic TX resources, consisting of memory mapped command Qs. | |
679 | */ | |
680 | static int alloc_tx_resources(struct sge *sge, struct sge_params *p) | |
681 | { | |
682 | struct pci_dev *pdev = sge->adapter->pdev; | |
683 | unsigned int size, i; | |
684 | ||
685 | for (i = 0; i < SGE_CMDQ_N; i++) { | |
559fb51b SB |
686 | struct cmdQ *q = &sge->cmdQ[i]; |
687 | ||
688 | q->genbit = 1; | |
689 | q->sop = 1; | |
690 | q->size = p->cmdQ_size[i]; | |
691 | q->in_use = 0; | |
692 | q->status = 0; | |
693 | q->processed = q->cleaned = 0; | |
694 | q->stop_thres = 0; | |
695 | spin_lock_init(&q->lock); | |
696 | size = sizeof(struct cmdQ_e) * q->size; | |
3e0f75be | 697 | q->entries = pci_alloc_consistent(pdev, size, &q->dma_addr); |
559fb51b | 698 | if (!q->entries) |
8199d3a7 | 699 | goto err_no_mem; |
3e0f75be | 700 | |
559fb51b | 701 | size = sizeof(struct cmdQ_ce) * q->size; |
cbee9f91 | 702 | q->centries = kzalloc(size, GFP_KERNEL); |
559fb51b | 703 | if (!q->centries) |
8199d3a7 CL |
704 | goto err_no_mem; |
705 | } | |
706 | ||
559fb51b SB |
707 | /* |
708 | * CommandQ 0 handles Ethernet and TOE packets, while queue 1 is TOE | |
709 | * only. For queue 0 set the stop threshold so we can handle one more | |
710 | * packet from each port, plus reserve an additional 24 entries for | |
711 | * Ethernet packets only. Queue 1 never suspends nor do we reserve | |
712 | * space for Ethernet packets. | |
713 | */ | |
714 | sge->cmdQ[0].stop_thres = sge->adapter->params.nports * | |
715 | (MAX_SKB_FRAGS + 1); | |
8199d3a7 CL |
716 | return 0; |
717 | ||
718 | err_no_mem: | |
719 | free_tx_resources(sge); | |
720 | return -ENOMEM; | |
721 | } | |
722 | ||
723 | static inline void setup_ring_params(struct adapter *adapter, u64 addr, | |
724 | u32 size, int base_reg_lo, | |
725 | int base_reg_hi, int size_reg) | |
726 | { | |
559fb51b SB |
727 | writel((u32)addr, adapter->regs + base_reg_lo); |
728 | writel(addr >> 32, adapter->regs + base_reg_hi); | |
729 | writel(size, adapter->regs + size_reg); | |
8199d3a7 CL |
730 | } |
731 | ||
732 | /* | |
733 | * Enable/disable VLAN acceleration. | |
734 | */ | |
735 | void t1_set_vlan_accel(struct adapter *adapter, int on_off) | |
736 | { | |
737 | struct sge *sge = adapter->sge; | |
738 | ||
739 | sge->sge_control &= ~F_VLAN_XTRACT; | |
740 | if (on_off) | |
741 | sge->sge_control |= F_VLAN_XTRACT; | |
742 | if (adapter->open_device_map) { | |
559fb51b | 743 | writel(sge->sge_control, adapter->regs + A_SG_CONTROL); |
f1d3d38a | 744 | readl(adapter->regs + A_SG_CONTROL); /* flush */ |
8199d3a7 CL |
745 | } |
746 | } | |
747 | ||
8199d3a7 CL |
748 | /* |
749 | * Programs the various SGE registers. However, the engine is not yet enabled, | |
750 | * but sge->sge_control is setup and ready to go. | |
751 | */ | |
752 | static void configure_sge(struct sge *sge, struct sge_params *p) | |
753 | { | |
754 | struct adapter *ap = sge->adapter; | |
356bd146 | 755 | |
559fb51b SB |
756 | writel(0, ap->regs + A_SG_CONTROL); |
757 | setup_ring_params(ap, sge->cmdQ[0].dma_addr, sge->cmdQ[0].size, | |
8199d3a7 | 758 | A_SG_CMD0BASELWR, A_SG_CMD0BASEUPR, A_SG_CMD0SIZE); |
559fb51b | 759 | setup_ring_params(ap, sge->cmdQ[1].dma_addr, sge->cmdQ[1].size, |
8199d3a7 CL |
760 | A_SG_CMD1BASELWR, A_SG_CMD1BASEUPR, A_SG_CMD1SIZE); |
761 | setup_ring_params(ap, sge->freelQ[0].dma_addr, | |
559fb51b | 762 | sge->freelQ[0].size, A_SG_FL0BASELWR, |
8199d3a7 CL |
763 | A_SG_FL0BASEUPR, A_SG_FL0SIZE); |
764 | setup_ring_params(ap, sge->freelQ[1].dma_addr, | |
559fb51b | 765 | sge->freelQ[1].size, A_SG_FL1BASELWR, |
8199d3a7 CL |
766 | A_SG_FL1BASEUPR, A_SG_FL1SIZE); |
767 | ||
768 | /* The threshold comparison uses <. */ | |
559fb51b | 769 | writel(SGE_RX_SM_BUF_SIZE + 1, ap->regs + A_SG_FLTHRESHOLD); |
8199d3a7 | 770 | |
559fb51b SB |
771 | setup_ring_params(ap, sge->respQ.dma_addr, sge->respQ.size, |
772 | A_SG_RSPBASELWR, A_SG_RSPBASEUPR, A_SG_RSPSIZE); | |
773 | writel((u32)sge->respQ.size - 1, ap->regs + A_SG_RSPQUEUECREDIT); | |
8199d3a7 CL |
774 | |
775 | sge->sge_control = F_CMDQ0_ENABLE | F_CMDQ1_ENABLE | F_FL0_ENABLE | | |
776 | F_FL1_ENABLE | F_CPL_ENABLE | F_RESPONSE_QUEUE_ENABLE | | |
777 | V_CMDQ_PRIORITY(2) | F_DISABLE_CMDQ1_GTS | F_ISCSI_COALESCE | | |
778 | V_RX_PKT_OFFSET(sge->rx_pkt_pad); | |
779 | ||
780 | #if defined(__BIG_ENDIAN_BITFIELD) | |
781 | sge->sge_control |= F_ENABLE_BIG_ENDIAN; | |
782 | #endif | |
783 | ||
559fb51b SB |
784 | /* Initialize no-resource timer */ |
785 | sge->intrtimer_nres = SGE_INTRTIMER_NRES * core_ticks_per_usec(ap); | |
786 | ||
787 | t1_sge_set_coalesce_params(sge, p); | |
8199d3a7 CL |
788 | } |
789 | ||
790 | /* | |
791 | * Return the payload capacity of the jumbo free-list buffers. | |
792 | */ | |
793 | static inline unsigned int jumbo_payload_capacity(const struct sge *sge) | |
794 | { | |
795 | return sge->freelQ[sge->jumbo_fl].rx_buffer_size - | |
559fb51b SB |
796 | sge->freelQ[sge->jumbo_fl].dma_offset - |
797 | sizeof(struct cpl_rx_data); | |
8199d3a7 CL |
798 | } |
799 | ||
800 | /* | |
801 | * Frees all SGE related resources and the sge structure itself | |
802 | */ | |
803 | void t1_sge_destroy(struct sge *sge) | |
804 | { | |
56f643c2 SH |
805 | int i; |
806 | ||
807 | for_each_port(sge->adapter, i) | |
808 | free_percpu(sge->port_stats[i]); | |
809 | ||
f1d3d38a | 810 | kfree(sge->tx_sched); |
8199d3a7 CL |
811 | free_tx_resources(sge); |
812 | free_rx_resources(sge); | |
813 | kfree(sge); | |
814 | } | |
815 | ||
816 | /* | |
817 | * Allocates new RX buffers on the freelist Q (and tracks them on the freelist | |
818 | * context Q) until the Q is full or alloc_skb fails. | |
819 | * | |
820 | * It is possible that the generation bits already match, indicating that the | |
821 | * buffer is already valid and nothing needs to be done. This happens when we | |
822 | * copied a received buffer into a new sk_buff during the interrupt processing. | |
823 | * | |
824 | * If the SGE doesn't automatically align packets properly (!sge->rx_pkt_pad), | |
825 | * we specify a RX_OFFSET in order to make sure that the IP header is 4B | |
826 | * aligned. | |
827 | */ | |
559fb51b | 828 | static void refill_free_list(struct sge *sge, struct freelQ *q) |
8199d3a7 CL |
829 | { |
830 | struct pci_dev *pdev = sge->adapter->pdev; | |
559fb51b SB |
831 | struct freelQ_ce *ce = &q->centries[q->pidx]; |
832 | struct freelQ_e *e = &q->entries[q->pidx]; | |
833 | unsigned int dma_len = q->rx_buffer_size - q->dma_offset; | |
8199d3a7 | 834 | |
559fb51b SB |
835 | while (q->credits < q->size) { |
836 | struct sk_buff *skb; | |
837 | dma_addr_t mapping; | |
8199d3a7 | 838 | |
559fb51b SB |
839 | skb = alloc_skb(q->rx_buffer_size, GFP_ATOMIC); |
840 | if (!skb) | |
841 | break; | |
842 | ||
843 | skb_reserve(skb, q->dma_offset); | |
844 | mapping = pci_map_single(pdev, skb->data, dma_len, | |
845 | PCI_DMA_FROMDEVICE); | |
24a427cf SH |
846 | skb_reserve(skb, sge->rx_pkt_pad); |
847 | ||
559fb51b SB |
848 | ce->skb = skb; |
849 | pci_unmap_addr_set(ce, dma_addr, mapping); | |
850 | pci_unmap_len_set(ce, dma_len, dma_len); | |
851 | e->addr_lo = (u32)mapping; | |
852 | e->addr_hi = (u64)mapping >> 32; | |
853 | e->len_gen = V_CMD_LEN(dma_len) | V_CMD_GEN1(q->genbit); | |
854 | wmb(); | |
855 | e->gen2 = V_CMD_GEN2(q->genbit); | |
8199d3a7 CL |
856 | |
857 | e++; | |
858 | ce++; | |
559fb51b SB |
859 | if (++q->pidx == q->size) { |
860 | q->pidx = 0; | |
861 | q->genbit ^= 1; | |
862 | ce = q->centries; | |
863 | e = q->entries; | |
8199d3a7 | 864 | } |
559fb51b | 865 | q->credits++; |
8199d3a7 | 866 | } |
8199d3a7 CL |
867 | } |
868 | ||
869 | /* | |
559fb51b SB |
870 | * Calls refill_free_list for both free lists. If we cannot fill at least 1/4 |
871 | * of both rings, we go into 'few interrupt mode' in order to give the system | |
872 | * time to free up resources. | |
8199d3a7 CL |
873 | */ |
874 | static void freelQs_empty(struct sge *sge) | |
875 | { | |
559fb51b SB |
876 | struct adapter *adapter = sge->adapter; |
877 | u32 irq_reg = readl(adapter->regs + A_SG_INT_ENABLE); | |
8199d3a7 CL |
878 | u32 irqholdoff_reg; |
879 | ||
880 | refill_free_list(sge, &sge->freelQ[0]); | |
881 | refill_free_list(sge, &sge->freelQ[1]); | |
882 | ||
559fb51b SB |
883 | if (sge->freelQ[0].credits > (sge->freelQ[0].size >> 2) && |
884 | sge->freelQ[1].credits > (sge->freelQ[1].size >> 2)) { | |
8199d3a7 | 885 | irq_reg |= F_FL_EXHAUSTED; |
559fb51b | 886 | irqholdoff_reg = sge->fixed_intrtimer; |
8199d3a7 CL |
887 | } else { |
888 | /* Clear the F_FL_EXHAUSTED interrupts for now */ | |
889 | irq_reg &= ~F_FL_EXHAUSTED; | |
890 | irqholdoff_reg = sge->intrtimer_nres; | |
891 | } | |
559fb51b SB |
892 | writel(irqholdoff_reg, adapter->regs + A_SG_INTRTIMER); |
893 | writel(irq_reg, adapter->regs + A_SG_INT_ENABLE); | |
8199d3a7 CL |
894 | |
895 | /* We reenable the Qs to force a freelist GTS interrupt later */ | |
559fb51b | 896 | doorbell_pio(adapter, F_FL0_ENABLE | F_FL1_ENABLE); |
8199d3a7 CL |
897 | } |
898 | ||
899 | #define SGE_PL_INTR_MASK (F_PL_INTR_SGE_ERR | F_PL_INTR_SGE_DATA) | |
900 | #define SGE_INT_FATAL (F_RESPQ_OVERFLOW | F_PACKET_TOO_BIG | F_PACKET_MISMATCH) | |
901 | #define SGE_INT_ENABLE (F_RESPQ_EXHAUSTED | F_RESPQ_OVERFLOW | \ | |
902 | F_FL_EXHAUSTED | F_PACKET_TOO_BIG | F_PACKET_MISMATCH) | |
903 | ||
904 | /* | |
905 | * Disable SGE Interrupts | |
906 | */ | |
907 | void t1_sge_intr_disable(struct sge *sge) | |
908 | { | |
559fb51b | 909 | u32 val = readl(sge->adapter->regs + A_PL_ENABLE); |
8199d3a7 | 910 | |
559fb51b SB |
911 | writel(val & ~SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_ENABLE); |
912 | writel(0, sge->adapter->regs + A_SG_INT_ENABLE); | |
8199d3a7 CL |
913 | } |
914 | ||
915 | /* | |
916 | * Enable SGE interrupts. | |
917 | */ | |
918 | void t1_sge_intr_enable(struct sge *sge) | |
919 | { | |
920 | u32 en = SGE_INT_ENABLE; | |
559fb51b | 921 | u32 val = readl(sge->adapter->regs + A_PL_ENABLE); |
8199d3a7 CL |
922 | |
923 | if (sge->adapter->flags & TSO_CAPABLE) | |
924 | en &= ~F_PACKET_TOO_BIG; | |
559fb51b SB |
925 | writel(en, sge->adapter->regs + A_SG_INT_ENABLE); |
926 | writel(val | SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_ENABLE); | |
8199d3a7 CL |
927 | } |
928 | ||
929 | /* | |
930 | * Clear SGE interrupts. | |
931 | */ | |
932 | void t1_sge_intr_clear(struct sge *sge) | |
933 | { | |
559fb51b SB |
934 | writel(SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_CAUSE); |
935 | writel(0xffffffff, sge->adapter->regs + A_SG_INT_CAUSE); | |
8199d3a7 CL |
936 | } |
937 | ||
938 | /* | |
939 | * SGE 'Error' interrupt handler | |
940 | */ | |
941 | int t1_sge_intr_error_handler(struct sge *sge) | |
942 | { | |
943 | struct adapter *adapter = sge->adapter; | |
559fb51b | 944 | u32 cause = readl(adapter->regs + A_SG_INT_CAUSE); |
8199d3a7 CL |
945 | |
946 | if (adapter->flags & TSO_CAPABLE) | |
947 | cause &= ~F_PACKET_TOO_BIG; | |
948 | if (cause & F_RESPQ_EXHAUSTED) | |
559fb51b | 949 | sge->stats.respQ_empty++; |
8199d3a7 | 950 | if (cause & F_RESPQ_OVERFLOW) { |
559fb51b | 951 | sge->stats.respQ_overflow++; |
8199d3a7 CL |
952 | CH_ALERT("%s: SGE response queue overflow\n", |
953 | adapter->name); | |
954 | } | |
955 | if (cause & F_FL_EXHAUSTED) { | |
559fb51b | 956 | sge->stats.freelistQ_empty++; |
8199d3a7 CL |
957 | freelQs_empty(sge); |
958 | } | |
959 | if (cause & F_PACKET_TOO_BIG) { | |
559fb51b | 960 | sge->stats.pkt_too_big++; |
8199d3a7 CL |
961 | CH_ALERT("%s: SGE max packet size exceeded\n", |
962 | adapter->name); | |
963 | } | |
964 | if (cause & F_PACKET_MISMATCH) { | |
559fb51b | 965 | sge->stats.pkt_mismatch++; |
8199d3a7 CL |
966 | CH_ALERT("%s: SGE packet mismatch\n", adapter->name); |
967 | } | |
968 | if (cause & SGE_INT_FATAL) | |
969 | t1_fatal_err(adapter); | |
970 | ||
559fb51b | 971 | writel(cause, adapter->regs + A_SG_INT_CAUSE); |
8199d3a7 CL |
972 | return 0; |
973 | } | |
974 | ||
56f643c2 | 975 | const struct sge_intr_counts *t1_sge_get_intr_counts(const struct sge *sge) |
559fb51b SB |
976 | { |
977 | return &sge->stats; | |
978 | } | |
979 | ||
56f643c2 SH |
980 | void t1_sge_get_port_stats(const struct sge *sge, int port, |
981 | struct sge_port_stats *ss) | |
559fb51b | 982 | { |
56f643c2 SH |
983 | int cpu; |
984 | ||
985 | memset(ss, 0, sizeof(*ss)); | |
986 | for_each_possible_cpu(cpu) { | |
987 | struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[port], cpu); | |
988 | ||
56f643c2 | 989 | ss->rx_cso_good += st->rx_cso_good; |
56f643c2 SH |
990 | ss->tx_cso += st->tx_cso; |
991 | ss->tx_tso += st->tx_tso; | |
7832ee03 | 992 | ss->tx_need_hdrroom += st->tx_need_hdrroom; |
56f643c2 SH |
993 | ss->vlan_xtract += st->vlan_xtract; |
994 | ss->vlan_insert += st->vlan_insert; | |
995 | } | |
559fb51b SB |
996 | } |
997 | ||
998 | /** | |
999 | * recycle_fl_buf - recycle a free list buffer | |
1000 | * @fl: the free list | |
1001 | * @idx: index of buffer to recycle | |
8199d3a7 | 1002 | * |
559fb51b SB |
1003 | * Recycles the specified buffer on the given free list by adding it at |
1004 | * the next available slot on the list. | |
8199d3a7 | 1005 | */ |
559fb51b | 1006 | static void recycle_fl_buf(struct freelQ *fl, int idx) |
8199d3a7 | 1007 | { |
559fb51b SB |
1008 | struct freelQ_e *from = &fl->entries[idx]; |
1009 | struct freelQ_e *to = &fl->entries[fl->pidx]; | |
8199d3a7 | 1010 | |
559fb51b SB |
1011 | fl->centries[fl->pidx] = fl->centries[idx]; |
1012 | to->addr_lo = from->addr_lo; | |
1013 | to->addr_hi = from->addr_hi; | |
1014 | to->len_gen = G_CMD_LEN(from->len_gen) | V_CMD_GEN1(fl->genbit); | |
1015 | wmb(); | |
1016 | to->gen2 = V_CMD_GEN2(fl->genbit); | |
1017 | fl->credits++; | |
8199d3a7 | 1018 | |
559fb51b SB |
1019 | if (++fl->pidx == fl->size) { |
1020 | fl->pidx = 0; | |
1021 | fl->genbit ^= 1; | |
8199d3a7 | 1022 | } |
559fb51b | 1023 | } |
8199d3a7 | 1024 | |
24a427cf SH |
1025 | static int copybreak __read_mostly = 256; |
1026 | module_param(copybreak, int, 0); | |
1027 | MODULE_PARM_DESC(copybreak, "Receive copy threshold"); | |
1028 | ||
559fb51b SB |
1029 | /** |
1030 | * get_packet - return the next ingress packet buffer | |
1031 | * @pdev: the PCI device that received the packet | |
1032 | * @fl: the SGE free list holding the packet | |
1033 | * @len: the actual packet length, excluding any SGE padding | |
1034 | * @dma_pad: padding at beginning of buffer left by SGE DMA | |
1035 | * @skb_pad: padding to be used if the packet is copied | |
1036 | * @copy_thres: length threshold under which a packet should be copied | |
1037 | * @drop_thres: # of remaining buffers before we start dropping packets | |
1038 | * | |
1039 | * Get the next packet from a free list and complete setup of the | |
1040 | * sk_buff. If the packet is small we make a copy and recycle the | |
1041 | * original buffer, otherwise we use the original buffer itself. If a | |
1042 | * positive drop threshold is supplied packets are dropped and their | |
1043 | * buffers recycled if (a) the number of remaining buffers is under the | |
1044 | * threshold and the packet is too big to copy, or (b) the packet should | |
1045 | * be copied but there is no memory for the copy. | |
1046 | */ | |
1047 | static inline struct sk_buff *get_packet(struct pci_dev *pdev, | |
24a427cf | 1048 | struct freelQ *fl, unsigned int len) |
559fb51b SB |
1049 | { |
1050 | struct sk_buff *skb; | |
24a427cf | 1051 | const struct freelQ_ce *ce = &fl->centries[fl->cidx]; |
559fb51b | 1052 | |
24a427cf SH |
1053 | if (len < copybreak) { |
1054 | skb = alloc_skb(len + 2, GFP_ATOMIC); | |
1055 | if (!skb) | |
1056 | goto use_orig_buf; | |
1057 | ||
1058 | skb_reserve(skb, 2); /* align IP header */ | |
1059 | skb_put(skb, len); | |
1060 | pci_dma_sync_single_for_cpu(pdev, | |
559fb51b | 1061 | pci_unmap_addr(ce, dma_addr), |
356bd146 | 1062 | pci_unmap_len(ce, dma_len), |
559fb51b | 1063 | PCI_DMA_FROMDEVICE); |
d626f62b | 1064 | skb_copy_from_linear_data(ce->skb, skb->data, len); |
24a427cf SH |
1065 | pci_dma_sync_single_for_device(pdev, |
1066 | pci_unmap_addr(ce, dma_addr), | |
1067 | pci_unmap_len(ce, dma_len), | |
1068 | PCI_DMA_FROMDEVICE); | |
559fb51b SB |
1069 | recycle_fl_buf(fl, fl->cidx); |
1070 | return skb; | |
8199d3a7 CL |
1071 | } |
1072 | ||
24a427cf SH |
1073 | use_orig_buf: |
1074 | if (fl->credits < 2) { | |
559fb51b SB |
1075 | recycle_fl_buf(fl, fl->cidx); |
1076 | return NULL; | |
1077 | } | |
8199d3a7 | 1078 | |
559fb51b SB |
1079 | pci_unmap_single(pdev, pci_unmap_addr(ce, dma_addr), |
1080 | pci_unmap_len(ce, dma_len), PCI_DMA_FROMDEVICE); | |
1081 | skb = ce->skb; | |
24a427cf SH |
1082 | prefetch(skb->data); |
1083 | ||
559fb51b SB |
1084 | skb_put(skb, len); |
1085 | return skb; | |
1086 | } | |
8199d3a7 | 1087 | |
559fb51b SB |
1088 | /** |
1089 | * unexpected_offload - handle an unexpected offload packet | |
1090 | * @adapter: the adapter | |
1091 | * @fl: the free list that received the packet | |
1092 | * | |
1093 | * Called when we receive an unexpected offload packet (e.g., the TOE | |
1094 | * function is disabled or the card is a NIC). Prints a message and | |
1095 | * recycles the buffer. | |
1096 | */ | |
1097 | static void unexpected_offload(struct adapter *adapter, struct freelQ *fl) | |
1098 | { | |
1099 | struct freelQ_ce *ce = &fl->centries[fl->cidx]; | |
1100 | struct sk_buff *skb = ce->skb; | |
1101 | ||
1102 | pci_dma_sync_single_for_cpu(adapter->pdev, pci_unmap_addr(ce, dma_addr), | |
1103 | pci_unmap_len(ce, dma_len), PCI_DMA_FROMDEVICE); | |
1104 | CH_ERR("%s: unexpected offload packet, cmd %u\n", | |
1105 | adapter->name, *skb->data); | |
1106 | recycle_fl_buf(fl, fl->cidx); | |
8199d3a7 CL |
1107 | } |
1108 | ||
f1d3d38a SH |
1109 | /* |
1110 | * T1/T2 SGE limits the maximum DMA size per TX descriptor to | |
1111 | * SGE_TX_DESC_MAX_PLEN (16KB). If the PAGE_SIZE is larger than 16KB, the | |
1112 | * stack might send more than SGE_TX_DESC_MAX_PLEN in a contiguous manner. | |
1113 | * Note that the *_large_page_tx_descs stuff will be optimized out when | |
1114 | * PAGE_SIZE <= SGE_TX_DESC_MAX_PLEN. | |
1115 | * | |
1116 | * compute_large_page_descs() computes how many additional descriptors are | |
1117 | * required to break down the stack's request. | |
1118 | */ | |
1119 | static inline unsigned int compute_large_page_tx_descs(struct sk_buff *skb) | |
1120 | { | |
1121 | unsigned int count = 0; | |
356bd146 | 1122 | |
f1d3d38a SH |
1123 | if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN) { |
1124 | unsigned int nfrags = skb_shinfo(skb)->nr_frags; | |
1125 | unsigned int i, len = skb->len - skb->data_len; | |
1126 | while (len > SGE_TX_DESC_MAX_PLEN) { | |
1127 | count++; | |
1128 | len -= SGE_TX_DESC_MAX_PLEN; | |
1129 | } | |
1130 | for (i = 0; nfrags--; i++) { | |
1131 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
1132 | len = frag->size; | |
1133 | while (len > SGE_TX_DESC_MAX_PLEN) { | |
1134 | count++; | |
1135 | len -= SGE_TX_DESC_MAX_PLEN; | |
1136 | } | |
1137 | } | |
1138 | } | |
1139 | return count; | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Write a cmdQ entry. | |
1144 | * | |
1145 | * Since this function writes the 'flags' field, it must not be used to | |
1146 | * write the first cmdQ entry. | |
1147 | */ | |
1148 | static inline void write_tx_desc(struct cmdQ_e *e, dma_addr_t mapping, | |
1149 | unsigned int len, unsigned int gen, | |
1150 | unsigned int eop) | |
1151 | { | |
1152 | if (unlikely(len > SGE_TX_DESC_MAX_PLEN)) | |
1153 | BUG(); | |
1154 | e->addr_lo = (u32)mapping; | |
1155 | e->addr_hi = (u64)mapping >> 32; | |
1156 | e->len_gen = V_CMD_LEN(len) | V_CMD_GEN1(gen); | |
1157 | e->flags = F_CMD_DATAVALID | V_CMD_EOP(eop) | V_CMD_GEN2(gen); | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * See comment for previous function. | |
1162 | * | |
1163 | * write_tx_descs_large_page() writes additional SGE tx descriptors if | |
1164 | * *desc_len exceeds HW's capability. | |
1165 | */ | |
1166 | static inline unsigned int write_large_page_tx_descs(unsigned int pidx, | |
1167 | struct cmdQ_e **e, | |
1168 | struct cmdQ_ce **ce, | |
1169 | unsigned int *gen, | |
1170 | dma_addr_t *desc_mapping, | |
1171 | unsigned int *desc_len, | |
1172 | unsigned int nfrags, | |
1173 | struct cmdQ *q) | |
1174 | { | |
1175 | if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN) { | |
1176 | struct cmdQ_e *e1 = *e; | |
1177 | struct cmdQ_ce *ce1 = *ce; | |
1178 | ||
1179 | while (*desc_len > SGE_TX_DESC_MAX_PLEN) { | |
1180 | *desc_len -= SGE_TX_DESC_MAX_PLEN; | |
1181 | write_tx_desc(e1, *desc_mapping, SGE_TX_DESC_MAX_PLEN, | |
1182 | *gen, nfrags == 0 && *desc_len == 0); | |
1183 | ce1->skb = NULL; | |
1184 | pci_unmap_len_set(ce1, dma_len, 0); | |
1185 | *desc_mapping += SGE_TX_DESC_MAX_PLEN; | |
1186 | if (*desc_len) { | |
1187 | ce1++; | |
1188 | e1++; | |
1189 | if (++pidx == q->size) { | |
1190 | pidx = 0; | |
1191 | *gen ^= 1; | |
1192 | ce1 = q->centries; | |
1193 | e1 = q->entries; | |
1194 | } | |
1195 | } | |
1196 | } | |
1197 | *e = e1; | |
1198 | *ce = ce1; | |
1199 | } | |
1200 | return pidx; | |
1201 | } | |
1202 | ||
8199d3a7 | 1203 | /* |
559fb51b SB |
1204 | * Write the command descriptors to transmit the given skb starting at |
1205 | * descriptor pidx with the given generation. | |
8199d3a7 | 1206 | */ |
559fb51b SB |
1207 | static inline void write_tx_descs(struct adapter *adapter, struct sk_buff *skb, |
1208 | unsigned int pidx, unsigned int gen, | |
1209 | struct cmdQ *q) | |
8199d3a7 | 1210 | { |
f1d3d38a | 1211 | dma_addr_t mapping, desc_mapping; |
559fb51b SB |
1212 | struct cmdQ_e *e, *e1; |
1213 | struct cmdQ_ce *ce; | |
f1d3d38a SH |
1214 | unsigned int i, flags, first_desc_len, desc_len, |
1215 | nfrags = skb_shinfo(skb)->nr_frags; | |
559fb51b | 1216 | |
f1d3d38a | 1217 | e = e1 = &q->entries[pidx]; |
559fb51b | 1218 | ce = &q->centries[pidx]; |
f1d3d38a SH |
1219 | |
1220 | mapping = pci_map_single(adapter->pdev, skb->data, | |
1221 | skb->len - skb->data_len, PCI_DMA_TODEVICE); | |
1222 | ||
1223 | desc_mapping = mapping; | |
1224 | desc_len = skb->len - skb->data_len; | |
1225 | ||
1226 | flags = F_CMD_DATAVALID | F_CMD_SOP | | |
1227 | V_CMD_EOP(nfrags == 0 && desc_len <= SGE_TX_DESC_MAX_PLEN) | | |
1228 | V_CMD_GEN2(gen); | |
1229 | first_desc_len = (desc_len <= SGE_TX_DESC_MAX_PLEN) ? | |
1230 | desc_len : SGE_TX_DESC_MAX_PLEN; | |
1231 | e->addr_lo = (u32)desc_mapping; | |
1232 | e->addr_hi = (u64)desc_mapping >> 32; | |
1233 | e->len_gen = V_CMD_LEN(first_desc_len) | V_CMD_GEN1(gen); | |
1234 | ce->skb = NULL; | |
1235 | pci_unmap_len_set(ce, dma_len, 0); | |
1236 | ||
1237 | if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN && | |
1238 | desc_len > SGE_TX_DESC_MAX_PLEN) { | |
1239 | desc_mapping += first_desc_len; | |
1240 | desc_len -= first_desc_len; | |
1241 | e1++; | |
1242 | ce++; | |
1243 | if (++pidx == q->size) { | |
1244 | pidx = 0; | |
1245 | gen ^= 1; | |
1246 | e1 = q->entries; | |
1247 | ce = q->centries; | |
1248 | } | |
1249 | pidx = write_large_page_tx_descs(pidx, &e1, &ce, &gen, | |
1250 | &desc_mapping, &desc_len, | |
1251 | nfrags, q); | |
1252 | ||
1253 | if (likely(desc_len)) | |
1254 | write_tx_desc(e1, desc_mapping, desc_len, gen, | |
1255 | nfrags == 0); | |
1256 | } | |
1257 | ||
559fb51b SB |
1258 | ce->skb = NULL; |
1259 | pci_unmap_addr_set(ce, dma_addr, mapping); | |
1260 | pci_unmap_len_set(ce, dma_len, skb->len - skb->data_len); | |
8199d3a7 | 1261 | |
f1d3d38a | 1262 | for (i = 0; nfrags--; i++) { |
559fb51b | 1263 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
559fb51b | 1264 | e1++; |
f1d3d38a | 1265 | ce++; |
559fb51b SB |
1266 | if (++pidx == q->size) { |
1267 | pidx = 0; | |
1268 | gen ^= 1; | |
559fb51b | 1269 | e1 = q->entries; |
f1d3d38a | 1270 | ce = q->centries; |
8199d3a7 | 1271 | } |
8199d3a7 | 1272 | |
559fb51b SB |
1273 | mapping = pci_map_page(adapter->pdev, frag->page, |
1274 | frag->page_offset, frag->size, | |
1275 | PCI_DMA_TODEVICE); | |
f1d3d38a SH |
1276 | desc_mapping = mapping; |
1277 | desc_len = frag->size; | |
1278 | ||
1279 | pidx = write_large_page_tx_descs(pidx, &e1, &ce, &gen, | |
1280 | &desc_mapping, &desc_len, | |
1281 | nfrags, q); | |
1282 | if (likely(desc_len)) | |
1283 | write_tx_desc(e1, desc_mapping, desc_len, gen, | |
1284 | nfrags == 0); | |
559fb51b SB |
1285 | ce->skb = NULL; |
1286 | pci_unmap_addr_set(ce, dma_addr, mapping); | |
1287 | pci_unmap_len_set(ce, dma_len, frag->size); | |
8199d3a7 | 1288 | } |
559fb51b SB |
1289 | ce->skb = skb; |
1290 | wmb(); | |
1291 | e->flags = flags; | |
1292 | } | |
8199d3a7 | 1293 | |
559fb51b SB |
1294 | /* |
1295 | * Clean up completed Tx buffers. | |
1296 | */ | |
1297 | static inline void reclaim_completed_tx(struct sge *sge, struct cmdQ *q) | |
1298 | { | |
1299 | unsigned int reclaim = q->processed - q->cleaned; | |
8199d3a7 | 1300 | |
559fb51b | 1301 | if (reclaim) { |
f1d3d38a SH |
1302 | pr_debug("reclaim_completed_tx processed:%d cleaned:%d\n", |
1303 | q->processed, q->cleaned); | |
559fb51b SB |
1304 | free_cmdQ_buffers(sge, q, reclaim); |
1305 | q->cleaned += reclaim; | |
8199d3a7 | 1306 | } |
559fb51b | 1307 | } |
8199d3a7 | 1308 | |
f1d3d38a SH |
1309 | /* |
1310 | * Called from tasklet. Checks the scheduler for any | |
1311 | * pending skbs that can be sent. | |
1312 | */ | |
1313 | static void restart_sched(unsigned long arg) | |
1314 | { | |
1315 | struct sge *sge = (struct sge *) arg; | |
1316 | struct adapter *adapter = sge->adapter; | |
1317 | struct cmdQ *q = &sge->cmdQ[0]; | |
1318 | struct sk_buff *skb; | |
1319 | unsigned int credits, queued_skb = 0; | |
1320 | ||
1321 | spin_lock(&q->lock); | |
1322 | reclaim_completed_tx(sge, q); | |
1323 | ||
1324 | credits = q->size - q->in_use; | |
1325 | pr_debug("restart_sched credits=%d\n", credits); | |
1326 | while ((skb = sched_skb(sge, NULL, credits)) != NULL) { | |
1327 | unsigned int genbit, pidx, count; | |
1328 | count = 1 + skb_shinfo(skb)->nr_frags; | |
356bd146 | 1329 | count += compute_large_page_tx_descs(skb); |
f1d3d38a SH |
1330 | q->in_use += count; |
1331 | genbit = q->genbit; | |
1332 | pidx = q->pidx; | |
1333 | q->pidx += count; | |
1334 | if (q->pidx >= q->size) { | |
1335 | q->pidx -= q->size; | |
1336 | q->genbit ^= 1; | |
1337 | } | |
1338 | write_tx_descs(adapter, skb, pidx, genbit, q); | |
1339 | credits = q->size - q->in_use; | |
1340 | queued_skb = 1; | |
1341 | } | |
1342 | ||
1343 | if (queued_skb) { | |
1344 | clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); | |
1345 | if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { | |
1346 | set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); | |
1347 | writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); | |
1348 | } | |
1349 | } | |
1350 | spin_unlock(&q->lock); | |
1351 | } | |
8199d3a7 | 1352 | |
559fb51b SB |
1353 | /** |
1354 | * sge_rx - process an ingress ethernet packet | |
1355 | * @sge: the sge structure | |
1356 | * @fl: the free list that contains the packet buffer | |
1357 | * @len: the packet length | |
8199d3a7 | 1358 | * |
559fb51b | 1359 | * Process an ingress ethernet pakcet and deliver it to the stack. |
8199d3a7 | 1360 | */ |
24a427cf | 1361 | static void sge_rx(struct sge *sge, struct freelQ *fl, unsigned int len) |
8199d3a7 | 1362 | { |
559fb51b | 1363 | struct sk_buff *skb; |
24a427cf | 1364 | const struct cpl_rx_pkt *p; |
559fb51b | 1365 | struct adapter *adapter = sge->adapter; |
56f643c2 | 1366 | struct sge_port_stats *st; |
8199d3a7 | 1367 | |
24a427cf | 1368 | skb = get_packet(adapter->pdev, fl, len - sge->rx_pkt_pad); |
56f643c2 SH |
1369 | if (unlikely(!skb)) { |
1370 | sge->stats.rx_drops++; | |
24a427cf | 1371 | return; |
8199d3a7 | 1372 | } |
559fb51b | 1373 | |
24a427cf | 1374 | p = (const struct cpl_rx_pkt *) skb->data; |
f1d3d38a SH |
1375 | if (p->iff >= adapter->params.nports) { |
1376 | kfree_skb(skb); | |
24a427cf | 1377 | return; |
f1d3d38a | 1378 | } |
24a427cf | 1379 | __skb_pull(skb, sizeof(*p)); |
f1d3d38a | 1380 | |
56f643c2 | 1381 | st = per_cpu_ptr(sge->port_stats[p->iff], smp_processor_id()); |
56f643c2 | 1382 | |
4c13eb66 | 1383 | skb->protocol = eth_type_trans(skb, adapter->port[p->iff].dev); |
7de6af0f | 1384 | skb->dev->last_rx = jiffies; |
559fb51b SB |
1385 | if ((adapter->flags & RX_CSUM_ENABLED) && p->csum == 0xffff && |
1386 | skb->protocol == htons(ETH_P_IP) && | |
1387 | (skb->data[9] == IPPROTO_TCP || skb->data[9] == IPPROTO_UDP)) { | |
56f643c2 | 1388 | ++st->rx_cso_good; |
559fb51b SB |
1389 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1390 | } else | |
1391 | skb->ip_summed = CHECKSUM_NONE; | |
1392 | ||
1393 | if (unlikely(adapter->vlan_grp && p->vlan_valid)) { | |
56f643c2 | 1394 | st->vlan_xtract++; |
7fe26a60 | 1395 | #ifdef CONFIG_CHELSIO_T1_NAPI |
559fb51b SB |
1396 | vlan_hwaccel_receive_skb(skb, adapter->vlan_grp, |
1397 | ntohs(p->vlan)); | |
7fe26a60 | 1398 | #else |
559fb51b SB |
1399 | vlan_hwaccel_rx(skb, adapter->vlan_grp, |
1400 | ntohs(p->vlan)); | |
7fe26a60 SH |
1401 | #endif |
1402 | } else { | |
1403 | #ifdef CONFIG_CHELSIO_T1_NAPI | |
559fb51b | 1404 | netif_receive_skb(skb); |
7fe26a60 | 1405 | #else |
559fb51b | 1406 | netif_rx(skb); |
7fe26a60 SH |
1407 | #endif |
1408 | } | |
8199d3a7 CL |
1409 | } |
1410 | ||
1411 | /* | |
559fb51b | 1412 | * Returns true if a command queue has enough available descriptors that |
8199d3a7 CL |
1413 | * we can resume Tx operation after temporarily disabling its packet queue. |
1414 | */ | |
559fb51b | 1415 | static inline int enough_free_Tx_descs(const struct cmdQ *q) |
8199d3a7 | 1416 | { |
559fb51b SB |
1417 | unsigned int r = q->processed - q->cleaned; |
1418 | ||
1419 | return q->in_use - r < (q->size >> 1); | |
8199d3a7 CL |
1420 | } |
1421 | ||
1422 | /* | |
559fb51b SB |
1423 | * Called when sufficient space has become available in the SGE command queues |
1424 | * after the Tx packet schedulers have been suspended to restart the Tx path. | |
8199d3a7 | 1425 | */ |
559fb51b | 1426 | static void restart_tx_queues(struct sge *sge) |
8199d3a7 | 1427 | { |
559fb51b | 1428 | struct adapter *adap = sge->adapter; |
3e0f75be | 1429 | int i; |
8199d3a7 | 1430 | |
3e0f75be FR |
1431 | if (!enough_free_Tx_descs(&sge->cmdQ[0])) |
1432 | return; | |
559fb51b | 1433 | |
3e0f75be FR |
1434 | for_each_port(adap, i) { |
1435 | struct net_device *nd = adap->port[i].dev; | |
559fb51b | 1436 | |
3e0f75be FR |
1437 | if (test_and_clear_bit(nd->if_port, &sge->stopped_tx_queues) && |
1438 | netif_running(nd)) { | |
1439 | sge->stats.cmdQ_restarted[2]++; | |
1440 | netif_wake_queue(nd); | |
559fb51b SB |
1441 | } |
1442 | } | |
1443 | } | |
1444 | ||
1445 | /* | |
356bd146 | 1446 | * update_tx_info is called from the interrupt handler/NAPI to return cmdQ0 |
559fb51b SB |
1447 | * information. |
1448 | */ | |
356bd146 FR |
1449 | static unsigned int update_tx_info(struct adapter *adapter, |
1450 | unsigned int flags, | |
559fb51b SB |
1451 | unsigned int pr0) |
1452 | { | |
1453 | struct sge *sge = adapter->sge; | |
1454 | struct cmdQ *cmdq = &sge->cmdQ[0]; | |
8199d3a7 | 1455 | |
559fb51b | 1456 | cmdq->processed += pr0; |
f1d3d38a SH |
1457 | if (flags & (F_FL0_ENABLE | F_FL1_ENABLE)) { |
1458 | freelQs_empty(sge); | |
1459 | flags &= ~(F_FL0_ENABLE | F_FL1_ENABLE); | |
1460 | } | |
559fb51b SB |
1461 | if (flags & F_CMDQ0_ENABLE) { |
1462 | clear_bit(CMDQ_STAT_RUNNING, &cmdq->status); | |
f1d3d38a | 1463 | |
559fb51b SB |
1464 | if (cmdq->cleaned + cmdq->in_use != cmdq->processed && |
1465 | !test_and_set_bit(CMDQ_STAT_LAST_PKT_DB, &cmdq->status)) { | |
1466 | set_bit(CMDQ_STAT_RUNNING, &cmdq->status); | |
1467 | writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); | |
1468 | } | |
f1d3d38a SH |
1469 | if (sge->tx_sched) |
1470 | tasklet_hi_schedule(&sge->tx_sched->sched_tsk); | |
1471 | ||
1472 | flags &= ~F_CMDQ0_ENABLE; | |
559fb51b | 1473 | } |
f1d3d38a | 1474 | |
559fb51b SB |
1475 | if (unlikely(sge->stopped_tx_queues != 0)) |
1476 | restart_tx_queues(sge); | |
8199d3a7 | 1477 | |
559fb51b SB |
1478 | return flags; |
1479 | } | |
8199d3a7 | 1480 | |
559fb51b SB |
1481 | /* |
1482 | * Process SGE responses, up to the supplied budget. Returns the number of | |
1483 | * responses processed. A negative budget is effectively unlimited. | |
1484 | */ | |
1485 | static int process_responses(struct adapter *adapter, int budget) | |
1486 | { | |
1487 | struct sge *sge = adapter->sge; | |
1488 | struct respQ *q = &sge->respQ; | |
1489 | struct respQ_e *e = &q->entries[q->cidx]; | |
24a427cf | 1490 | int done = 0; |
559fb51b SB |
1491 | unsigned int flags = 0; |
1492 | unsigned int cmdq_processed[SGE_CMDQ_N] = {0, 0}; | |
356bd146 | 1493 | |
24a427cf | 1494 | while (done < budget && e->GenerationBit == q->genbit) { |
559fb51b | 1495 | flags |= e->Qsleeping; |
356bd146 | 1496 | |
559fb51b SB |
1497 | cmdq_processed[0] += e->Cmdq0CreditReturn; |
1498 | cmdq_processed[1] += e->Cmdq1CreditReturn; | |
356bd146 | 1499 | |
559fb51b SB |
1500 | /* We batch updates to the TX side to avoid cacheline |
1501 | * ping-pong of TX state information on MP where the sender | |
1502 | * might run on a different CPU than this function... | |
1503 | */ | |
24a427cf | 1504 | if (unlikely((flags & F_CMDQ0_ENABLE) || cmdq_processed[0] > 64)) { |
559fb51b SB |
1505 | flags = update_tx_info(adapter, flags, cmdq_processed[0]); |
1506 | cmdq_processed[0] = 0; | |
1507 | } | |
24a427cf | 1508 | |
559fb51b SB |
1509 | if (unlikely(cmdq_processed[1] > 16)) { |
1510 | sge->cmdQ[1].processed += cmdq_processed[1]; | |
1511 | cmdq_processed[1] = 0; | |
8199d3a7 | 1512 | } |
24a427cf | 1513 | |
8199d3a7 | 1514 | if (likely(e->DataValid)) { |
559fb51b SB |
1515 | struct freelQ *fl = &sge->freelQ[e->FreelistQid]; |
1516 | ||
5d9428de | 1517 | BUG_ON(!e->Sop || !e->Eop); |
559fb51b SB |
1518 | if (unlikely(e->Offload)) |
1519 | unexpected_offload(adapter, fl); | |
1520 | else | |
1521 | sge_rx(sge, fl, e->BufferLength); | |
1522 | ||
24a427cf SH |
1523 | ++done; |
1524 | ||
559fb51b SB |
1525 | /* |
1526 | * Note: this depends on each packet consuming a | |
1527 | * single free-list buffer; cf. the BUG above. | |
1528 | */ | |
1529 | if (++fl->cidx == fl->size) | |
1530 | fl->cidx = 0; | |
24a427cf SH |
1531 | prefetch(fl->centries[fl->cidx].skb); |
1532 | ||
559fb51b SB |
1533 | if (unlikely(--fl->credits < |
1534 | fl->size - SGE_FREEL_REFILL_THRESH)) | |
1535 | refill_free_list(sge, fl); | |
1536 | } else | |
1537 | sge->stats.pure_rsps++; | |
8199d3a7 | 1538 | |
8199d3a7 | 1539 | e++; |
559fb51b SB |
1540 | if (unlikely(++q->cidx == q->size)) { |
1541 | q->cidx = 0; | |
1542 | q->genbit ^= 1; | |
1543 | e = q->entries; | |
1544 | } | |
1545 | prefetch(e); | |
1546 | ||
1547 | if (++q->credits > SGE_RESPQ_REPLENISH_THRES) { | |
1548 | writel(q->credits, adapter->regs + A_SG_RSPQUEUECREDIT); | |
1549 | q->credits = 0; | |
8199d3a7 CL |
1550 | } |
1551 | } | |
1552 | ||
356bd146 | 1553 | flags = update_tx_info(adapter, flags, cmdq_processed[0]); |
559fb51b | 1554 | sge->cmdQ[1].processed += cmdq_processed[1]; |
8199d3a7 | 1555 | |
24a427cf | 1556 | return done; |
559fb51b | 1557 | } |
8199d3a7 | 1558 | |
3de00b89 SH |
1559 | static inline int responses_pending(const struct adapter *adapter) |
1560 | { | |
1561 | const struct respQ *Q = &adapter->sge->respQ; | |
1562 | const struct respQ_e *e = &Q->entries[Q->cidx]; | |
1563 | ||
1564 | return (e->GenerationBit == Q->genbit); | |
1565 | } | |
1566 | ||
7fe26a60 | 1567 | #ifdef CONFIG_CHELSIO_T1_NAPI |
559fb51b SB |
1568 | /* |
1569 | * A simpler version of process_responses() that handles only pure (i.e., | |
1570 | * non data-carrying) responses. Such respones are too light-weight to justify | |
1571 | * calling a softirq when using NAPI, so we handle them specially in hard | |
1572 | * interrupt context. The function is called with a pointer to a response, | |
1573 | * which the caller must ensure is a valid pure response. Returns 1 if it | |
1574 | * encounters a valid data-carrying response, 0 otherwise. | |
1575 | */ | |
3de00b89 | 1576 | static int process_pure_responses(struct adapter *adapter) |
559fb51b SB |
1577 | { |
1578 | struct sge *sge = adapter->sge; | |
1579 | struct respQ *q = &sge->respQ; | |
3de00b89 | 1580 | struct respQ_e *e = &q->entries[q->cidx]; |
24a427cf | 1581 | const struct freelQ *fl = &sge->freelQ[e->FreelistQid]; |
559fb51b SB |
1582 | unsigned int flags = 0; |
1583 | unsigned int cmdq_processed[SGE_CMDQ_N] = {0, 0}; | |
8199d3a7 | 1584 | |
24a427cf | 1585 | prefetch(fl->centries[fl->cidx].skb); |
3de00b89 SH |
1586 | if (e->DataValid) |
1587 | return 1; | |
24a427cf | 1588 | |
559fb51b SB |
1589 | do { |
1590 | flags |= e->Qsleeping; | |
8199d3a7 | 1591 | |
559fb51b SB |
1592 | cmdq_processed[0] += e->Cmdq0CreditReturn; |
1593 | cmdq_processed[1] += e->Cmdq1CreditReturn; | |
356bd146 | 1594 | |
559fb51b SB |
1595 | e++; |
1596 | if (unlikely(++q->cidx == q->size)) { | |
1597 | q->cidx = 0; | |
1598 | q->genbit ^= 1; | |
1599 | e = q->entries; | |
8199d3a7 | 1600 | } |
559fb51b | 1601 | prefetch(e); |
8199d3a7 | 1602 | |
559fb51b SB |
1603 | if (++q->credits > SGE_RESPQ_REPLENISH_THRES) { |
1604 | writel(q->credits, adapter->regs + A_SG_RSPQUEUECREDIT); | |
1605 | q->credits = 0; | |
8199d3a7 | 1606 | } |
559fb51b SB |
1607 | sge->stats.pure_rsps++; |
1608 | } while (e->GenerationBit == q->genbit && !e->DataValid); | |
8199d3a7 | 1609 | |
356bd146 | 1610 | flags = update_tx_info(adapter, flags, cmdq_processed[0]); |
559fb51b | 1611 | sge->cmdQ[1].processed += cmdq_processed[1]; |
8199d3a7 | 1612 | |
559fb51b | 1613 | return e->GenerationBit == q->genbit; |
8199d3a7 CL |
1614 | } |
1615 | ||
1616 | /* | |
559fb51b SB |
1617 | * Handler for new data events when using NAPI. This does not need any locking |
1618 | * or protection from interrupts as data interrupts are off at this point and | |
1619 | * other adapter interrupts do not interfere. | |
8199d3a7 | 1620 | */ |
bea3348e | 1621 | int t1_poll(struct napi_struct *napi, int budget) |
8199d3a7 | 1622 | { |
bea3348e SH |
1623 | struct adapter *adapter = container_of(napi, struct adapter, napi); |
1624 | struct net_device *dev = adapter->port[0].dev; | |
445cf803 | 1625 | int work_done = process_responses(adapter, budget); |
7fe26a60 | 1626 | |
445cf803 | 1627 | if (likely(work_done < budget)) { |
bea3348e SH |
1628 | netif_rx_complete(dev, napi); |
1629 | writel(adapter->sge->respQ.cidx, | |
1630 | adapter->regs + A_SG_SLEEPING); | |
1631 | } | |
1632 | return work_done; | |
559fb51b | 1633 | } |
8199d3a7 | 1634 | |
559fb51b SB |
1635 | /* |
1636 | * NAPI version of the main interrupt handler. | |
1637 | */ | |
7fe26a60 | 1638 | irqreturn_t t1_interrupt(int irq, void *data) |
559fb51b | 1639 | { |
559fb51b SB |
1640 | struct adapter *adapter = data; |
1641 | struct sge *sge = adapter->sge; | |
3de00b89 | 1642 | int handled; |
559fb51b | 1643 | |
3de00b89 SH |
1644 | if (likely(responses_pending(adapter))) { |
1645 | struct net_device *dev = sge->netdev; | |
559fb51b | 1646 | |
356bd146 | 1647 | writel(F_PL_INTR_SGE_DATA, adapter->regs + A_PL_CAUSE); |
7fe26a60 | 1648 | |
bea3348e | 1649 | if (napi_schedule_prep(&adapter->napi)) { |
3de00b89 | 1650 | if (process_pure_responses(adapter)) |
bea3348e | 1651 | __netif_rx_schedule(dev, &adapter->napi); |
3de00b89 SH |
1652 | else { |
1653 | /* no data, no NAPI needed */ | |
1654 | writel(sge->respQ.cidx, adapter->regs + A_SG_SLEEPING); | |
bea3348e | 1655 | napi_enable(&adapter->napi); /* undo schedule_prep */ |
7fe26a60 | 1656 | } |
7fe26a60 | 1657 | } |
3de00b89 SH |
1658 | return IRQ_HANDLED; |
1659 | } | |
1660 | ||
1661 | spin_lock(&adapter->async_lock); | |
1662 | handled = t1_slow_intr_handler(adapter); | |
1663 | spin_unlock(&adapter->async_lock); | |
7fe26a60 | 1664 | |
559fb51b SB |
1665 | if (!handled) |
1666 | sge->stats.unhandled_irqs++; | |
3de00b89 | 1667 | |
559fb51b SB |
1668 | return IRQ_RETVAL(handled != 0); |
1669 | } | |
8199d3a7 | 1670 | |
7fe26a60 | 1671 | #else |
559fb51b SB |
1672 | /* |
1673 | * Main interrupt handler, optimized assuming that we took a 'DATA' | |
1674 | * interrupt. | |
1675 | * | |
1676 | * 1. Clear the interrupt | |
1677 | * 2. Loop while we find valid descriptors and process them; accumulate | |
1678 | * information that can be processed after the loop | |
1679 | * 3. Tell the SGE at which index we stopped processing descriptors | |
1680 | * 4. Bookkeeping; free TX buffers, ring doorbell if there are any | |
1681 | * outstanding TX buffers waiting, replenish RX buffers, potentially | |
1682 | * reenable upper layers if they were turned off due to lack of TX | |
1683 | * resources which are available again. | |
1684 | * 5. If we took an interrupt, but no valid respQ descriptors was found we | |
1685 | * let the slow_intr_handler run and do error handling. | |
1686 | */ | |
7fe26a60 | 1687 | irqreturn_t t1_interrupt(int irq, void *cookie) |
559fb51b SB |
1688 | { |
1689 | int work_done; | |
559fb51b | 1690 | struct adapter *adapter = cookie; |
54d3e568 | 1691 | struct respQ *Q = &adapter->sge->respQ; |
8199d3a7 | 1692 | |
559fb51b | 1693 | spin_lock(&adapter->async_lock); |
8199d3a7 | 1694 | |
559fb51b | 1695 | writel(F_PL_INTR_SGE_DATA, adapter->regs + A_PL_CAUSE); |
8199d3a7 | 1696 | |
b9662d0e | 1697 | if (likely(responses_pending(adapter))) |
559fb51b SB |
1698 | work_done = process_responses(adapter, -1); |
1699 | else | |
1700 | work_done = t1_slow_intr_handler(adapter); | |
8199d3a7 | 1701 | |
559fb51b SB |
1702 | /* |
1703 | * The unconditional clearing of the PL_CAUSE above may have raced | |
1704 | * with DMA completion and the corresponding generation of a response | |
1705 | * to cause us to miss the resulting data interrupt. The next write | |
1706 | * is also unconditional to recover the missed interrupt and render | |
1707 | * this race harmless. | |
1708 | */ | |
1709 | writel(Q->cidx, adapter->regs + A_SG_SLEEPING); | |
1710 | ||
1711 | if (!work_done) | |
1712 | adapter->sge->stats.unhandled_irqs++; | |
1713 | spin_unlock(&adapter->async_lock); | |
1714 | return IRQ_RETVAL(work_done != 0); | |
1715 | } | |
7fe26a60 | 1716 | #endif |
559fb51b SB |
1717 | |
1718 | /* | |
1719 | * Enqueues the sk_buff onto the cmdQ[qid] and has hardware fetch it. | |
1720 | * | |
1721 | * The code figures out how many entries the sk_buff will require in the | |
1722 | * cmdQ and updates the cmdQ data structure with the state once the enqueue | |
1723 | * has complete. Then, it doesn't access the global structure anymore, but | |
1724 | * uses the corresponding fields on the stack. In conjuction with a spinlock | |
1725 | * around that code, we can make the function reentrant without holding the | |
1726 | * lock when we actually enqueue (which might be expensive, especially on | |
1727 | * architectures with IO MMUs). | |
1728 | * | |
1729 | * This runs with softirqs disabled. | |
1730 | */ | |
aa84505f SH |
1731 | static int t1_sge_tx(struct sk_buff *skb, struct adapter *adapter, |
1732 | unsigned int qid, struct net_device *dev) | |
559fb51b SB |
1733 | { |
1734 | struct sge *sge = adapter->sge; | |
1735 | struct cmdQ *q = &sge->cmdQ[qid]; | |
f1d3d38a | 1736 | unsigned int credits, pidx, genbit, count, use_sched_skb = 0; |
559fb51b | 1737 | |
cabdfb37 SH |
1738 | if (!spin_trylock(&q->lock)) |
1739 | return NETDEV_TX_LOCKED; | |
1740 | ||
559fb51b SB |
1741 | reclaim_completed_tx(sge, q); |
1742 | ||
1743 | pidx = q->pidx; | |
1744 | credits = q->size - q->in_use; | |
1745 | count = 1 + skb_shinfo(skb)->nr_frags; | |
f1d3d38a | 1746 | count += compute_large_page_tx_descs(skb); |
559fb51b | 1747 | |
f1d3d38a SH |
1748 | /* Ethernet packet */ |
1749 | if (unlikely(credits < count)) { | |
1750 | if (!netif_queue_stopped(dev)) { | |
559fb51b SB |
1751 | netif_stop_queue(dev); |
1752 | set_bit(dev->if_port, &sge->stopped_tx_queues); | |
232a347a | 1753 | sge->stats.cmdQ_full[2]++; |
f1d3d38a SH |
1754 | CH_ERR("%s: Tx ring full while queue awake!\n", |
1755 | adapter->name); | |
8199d3a7 | 1756 | } |
f1d3d38a SH |
1757 | spin_unlock(&q->lock); |
1758 | return NETDEV_TX_BUSY; | |
1759 | } | |
1760 | ||
1761 | if (unlikely(credits - count < q->stop_thres)) { | |
1762 | netif_stop_queue(dev); | |
1763 | set_bit(dev->if_port, &sge->stopped_tx_queues); | |
1764 | sge->stats.cmdQ_full[2]++; | |
1765 | } | |
1766 | ||
1767 | /* T204 cmdQ0 skbs that are destined for a certain port have to go | |
1768 | * through the scheduler. | |
1769 | */ | |
1770 | if (sge->tx_sched && !qid && skb->dev) { | |
356bd146 | 1771 | use_sched: |
f1d3d38a SH |
1772 | use_sched_skb = 1; |
1773 | /* Note that the scheduler might return a different skb than | |
1774 | * the one passed in. | |
1775 | */ | |
1776 | skb = sched_skb(sge, skb, credits); | |
1777 | if (!skb) { | |
1778 | spin_unlock(&q->lock); | |
1779 | return NETDEV_TX_OK; | |
559fb51b | 1780 | } |
f1d3d38a SH |
1781 | pidx = q->pidx; |
1782 | count = 1 + skb_shinfo(skb)->nr_frags; | |
1783 | count += compute_large_page_tx_descs(skb); | |
559fb51b | 1784 | } |
f1d3d38a | 1785 | |
559fb51b SB |
1786 | q->in_use += count; |
1787 | genbit = q->genbit; | |
f1d3d38a | 1788 | pidx = q->pidx; |
559fb51b SB |
1789 | q->pidx += count; |
1790 | if (q->pidx >= q->size) { | |
1791 | q->pidx -= q->size; | |
1792 | q->genbit ^= 1; | |
8199d3a7 | 1793 | } |
559fb51b | 1794 | spin_unlock(&q->lock); |
8199d3a7 | 1795 | |
559fb51b | 1796 | write_tx_descs(adapter, skb, pidx, genbit, q); |
8199d3a7 CL |
1797 | |
1798 | /* | |
1799 | * We always ring the doorbell for cmdQ1. For cmdQ0, we only ring | |
1800 | * the doorbell if the Q is asleep. There is a natural race, where | |
1801 | * the hardware is going to sleep just after we checked, however, | |
1802 | * then the interrupt handler will detect the outstanding TX packet | |
1803 | * and ring the doorbell for us. | |
1804 | */ | |
559fb51b SB |
1805 | if (qid) |
1806 | doorbell_pio(adapter, F_CMDQ1_ENABLE); | |
1807 | else { | |
1808 | clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); | |
1809 | if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { | |
1810 | set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); | |
1811 | writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); | |
1812 | } | |
8199d3a7 | 1813 | } |
f1d3d38a SH |
1814 | |
1815 | if (use_sched_skb) { | |
1816 | if (spin_trylock(&q->lock)) { | |
1817 | credits = q->size - q->in_use; | |
1818 | skb = NULL; | |
1819 | goto use_sched; | |
1820 | } | |
1821 | } | |
aa84505f | 1822 | return NETDEV_TX_OK; |
8199d3a7 CL |
1823 | } |
1824 | ||
1825 | #define MK_ETH_TYPE_MSS(type, mss) (((mss) & 0x3FFF) | ((type) << 14)) | |
1826 | ||
559fb51b SB |
1827 | /* |
1828 | * eth_hdr_len - return the length of an Ethernet header | |
1829 | * @data: pointer to the start of the Ethernet header | |
1830 | * | |
1831 | * Returns the length of an Ethernet header, including optional VLAN tag. | |
1832 | */ | |
1833 | static inline int eth_hdr_len(const void *data) | |
1834 | { | |
1835 | const struct ethhdr *e = data; | |
1836 | ||
1837 | return e->h_proto == htons(ETH_P_8021Q) ? VLAN_ETH_HLEN : ETH_HLEN; | |
1838 | } | |
1839 | ||
8199d3a7 CL |
1840 | /* |
1841 | * Adds the CPL header to the sk_buff and passes it to t1_sge_tx. | |
1842 | */ | |
1843 | int t1_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
1844 | { | |
1845 | struct adapter *adapter = dev->priv; | |
559fb51b | 1846 | struct sge *sge = adapter->sge; |
7832ee03 DLR |
1847 | struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[dev->if_port], |
1848 | smp_processor_id()); | |
8199d3a7 | 1849 | struct cpl_tx_pkt *cpl; |
cabdfb37 SH |
1850 | struct sk_buff *orig_skb = skb; |
1851 | int ret; | |
8199d3a7 | 1852 | |
f1d3d38a SH |
1853 | if (skb->protocol == htons(ETH_P_CPL5)) |
1854 | goto send; | |
1855 | ||
7832ee03 DLR |
1856 | /* |
1857 | * We are using a non-standard hard_header_len. | |
1858 | * Allocate more header room in the rare cases it is not big enough. | |
1859 | */ | |
1860 | if (unlikely(skb_headroom(skb) < dev->hard_header_len - ETH_HLEN)) { | |
1861 | skb = skb_realloc_headroom(skb, sizeof(struct cpl_tx_pkt_lso)); | |
1862 | ++st->tx_need_hdrroom; | |
1863 | dev_kfree_skb_any(orig_skb); | |
1864 | if (!skb) | |
1865 | return NETDEV_TX_OK; | |
1866 | } | |
1867 | ||
f1d3d38a | 1868 | if (skb_shinfo(skb)->gso_size) { |
8199d3a7 CL |
1869 | int eth_type; |
1870 | struct cpl_tx_pkt_lso *hdr; | |
1871 | ||
56f643c2 | 1872 | ++st->tx_tso; |
559fb51b | 1873 | |
bbe735e4 | 1874 | eth_type = skb_network_offset(skb) == ETH_HLEN ? |
8199d3a7 CL |
1875 | CPL_ETH_II : CPL_ETH_II_VLAN; |
1876 | ||
1877 | hdr = (struct cpl_tx_pkt_lso *)skb_push(skb, sizeof(*hdr)); | |
1878 | hdr->opcode = CPL_TX_PKT_LSO; | |
1879 | hdr->ip_csum_dis = hdr->l4_csum_dis = 0; | |
eddc9ec5 | 1880 | hdr->ip_hdr_words = ip_hdr(skb)->ihl; |
aa8223c7 | 1881 | hdr->tcp_hdr_words = tcp_hdr(skb)->doff; |
8199d3a7 | 1882 | hdr->eth_type_mss = htons(MK_ETH_TYPE_MSS(eth_type, |
f1d3d38a | 1883 | skb_shinfo(skb)->gso_size)); |
8199d3a7 CL |
1884 | hdr->len = htonl(skb->len - sizeof(*hdr)); |
1885 | cpl = (struct cpl_tx_pkt *)hdr; | |
f1d3d38a | 1886 | } else { |
8199d3a7 | 1887 | /* |
356bd146 | 1888 | * Packets shorter than ETH_HLEN can break the MAC, drop them |
559fb51b SB |
1889 | * early. Also, we may get oversized packets because some |
1890 | * parts of the kernel don't handle our unusual hard_header_len | |
1891 | * right, drop those too. | |
8199d3a7 | 1892 | */ |
559fb51b SB |
1893 | if (unlikely(skb->len < ETH_HLEN || |
1894 | skb->len > dev->mtu + eth_hdr_len(skb->data))) { | |
f1d3d38a SH |
1895 | pr_debug("%s: packet size %d hdr %d mtu%d\n", dev->name, |
1896 | skb->len, eth_hdr_len(skb->data), dev->mtu); | |
559fb51b | 1897 | dev_kfree_skb_any(skb); |
aa84505f | 1898 | return NETDEV_TX_OK; |
559fb51b SB |
1899 | } |
1900 | ||
8199d3a7 | 1901 | if (!(adapter->flags & UDP_CSUM_CAPABLE) && |
84fa7933 | 1902 | skb->ip_summed == CHECKSUM_PARTIAL && |
eddc9ec5 | 1903 | ip_hdr(skb)->protocol == IPPROTO_UDP) { |
84fa7933 | 1904 | if (unlikely(skb_checksum_help(skb))) { |
f1d3d38a | 1905 | pr_debug("%s: unable to do udp checksum\n", dev->name); |
559fb51b | 1906 | dev_kfree_skb_any(skb); |
aa84505f | 1907 | return NETDEV_TX_OK; |
559fb51b | 1908 | } |
f1d3d38a | 1909 | } |
8199d3a7 | 1910 | |
559fb51b SB |
1911 | /* Hmmm, assuming to catch the gratious arp... and we'll use |
1912 | * it to flush out stuck espi packets... | |
f1d3d38a SH |
1913 | */ |
1914 | if ((unlikely(!adapter->sge->espibug_skb[dev->if_port]))) { | |
8199d3a7 | 1915 | if (skb->protocol == htons(ETH_P_ARP) && |
d0a92be0 | 1916 | arp_hdr(skb)->ar_op == htons(ARPOP_REQUEST)) { |
f1d3d38a | 1917 | adapter->sge->espibug_skb[dev->if_port] = skb; |
559fb51b SB |
1918 | /* We want to re-use this skb later. We |
1919 | * simply bump the reference count and it | |
1920 | * will not be freed... | |
1921 | */ | |
1922 | skb = skb_get(skb); | |
1923 | } | |
8199d3a7 | 1924 | } |
559fb51b SB |
1925 | |
1926 | cpl = (struct cpl_tx_pkt *)__skb_push(skb, sizeof(*cpl)); | |
8199d3a7 CL |
1927 | cpl->opcode = CPL_TX_PKT; |
1928 | cpl->ip_csum_dis = 1; /* SW calculates IP csum */ | |
84fa7933 | 1929 | cpl->l4_csum_dis = skb->ip_summed == CHECKSUM_PARTIAL ? 0 : 1; |
8199d3a7 | 1930 | /* the length field isn't used so don't bother setting it */ |
559fb51b | 1931 | |
84fa7933 | 1932 | st->tx_cso += (skb->ip_summed == CHECKSUM_PARTIAL); |
8199d3a7 CL |
1933 | } |
1934 | cpl->iff = dev->if_port; | |
1935 | ||
1936 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
1937 | if (adapter->vlan_grp && vlan_tx_tag_present(skb)) { | |
1938 | cpl->vlan_valid = 1; | |
1939 | cpl->vlan = htons(vlan_tx_tag_get(skb)); | |
559fb51b | 1940 | st->vlan_insert++; |
8199d3a7 CL |
1941 | } else |
1942 | #endif | |
1943 | cpl->vlan_valid = 0; | |
1944 | ||
f1d3d38a | 1945 | send: |
8199d3a7 | 1946 | dev->trans_start = jiffies; |
cabdfb37 SH |
1947 | ret = t1_sge_tx(skb, adapter, 0, dev); |
1948 | ||
1949 | /* If transmit busy, and we reallocated skb's due to headroom limit, | |
1950 | * then silently discard to avoid leak. | |
1951 | */ | |
1952 | if (unlikely(ret != NETDEV_TX_OK && skb != orig_skb)) { | |
356bd146 | 1953 | dev_kfree_skb_any(skb); |
cabdfb37 | 1954 | ret = NETDEV_TX_OK; |
356bd146 | 1955 | } |
cabdfb37 | 1956 | return ret; |
559fb51b | 1957 | } |
8199d3a7 | 1958 | |
559fb51b SB |
1959 | /* |
1960 | * Callback for the Tx buffer reclaim timer. Runs with softirqs disabled. | |
1961 | */ | |
1962 | static void sge_tx_reclaim_cb(unsigned long data) | |
1963 | { | |
1964 | int i; | |
1965 | struct sge *sge = (struct sge *)data; | |
1966 | ||
1967 | for (i = 0; i < SGE_CMDQ_N; ++i) { | |
1968 | struct cmdQ *q = &sge->cmdQ[i]; | |
1969 | ||
1970 | if (!spin_trylock(&q->lock)) | |
1971 | continue; | |
8199d3a7 | 1972 | |
559fb51b | 1973 | reclaim_completed_tx(sge, q); |
f1d3d38a SH |
1974 | if (i == 0 && q->in_use) { /* flush pending credits */ |
1975 | writel(F_CMDQ0_ENABLE, sge->adapter->regs + A_SG_DOORBELL); | |
1976 | } | |
559fb51b SB |
1977 | spin_unlock(&q->lock); |
1978 | } | |
1979 | mod_timer(&sge->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); | |
1980 | } | |
1981 | ||
1982 | /* | |
1983 | * Propagate changes of the SGE coalescing parameters to the HW. | |
1984 | */ | |
1985 | int t1_sge_set_coalesce_params(struct sge *sge, struct sge_params *p) | |
1986 | { | |
559fb51b SB |
1987 | sge->fixed_intrtimer = p->rx_coalesce_usecs * |
1988 | core_ticks_per_usec(sge->adapter); | |
1989 | writel(sge->fixed_intrtimer, sge->adapter->regs + A_SG_INTRTIMER); | |
8199d3a7 CL |
1990 | return 0; |
1991 | } | |
1992 | ||
559fb51b SB |
1993 | /* |
1994 | * Allocates both RX and TX resources and configures the SGE. However, | |
1995 | * the hardware is not enabled yet. | |
1996 | */ | |
1997 | int t1_sge_configure(struct sge *sge, struct sge_params *p) | |
8199d3a7 | 1998 | { |
559fb51b SB |
1999 | if (alloc_rx_resources(sge, p)) |
2000 | return -ENOMEM; | |
2001 | if (alloc_tx_resources(sge, p)) { | |
2002 | free_rx_resources(sge); | |
2003 | return -ENOMEM; | |
2004 | } | |
2005 | configure_sge(sge, p); | |
2006 | ||
2007 | /* | |
2008 | * Now that we have sized the free lists calculate the payload | |
2009 | * capacity of the large buffers. Other parts of the driver use | |
2010 | * this to set the max offload coalescing size so that RX packets | |
2011 | * do not overflow our large buffers. | |
2012 | */ | |
2013 | p->large_buf_capacity = jumbo_payload_capacity(sge); | |
2014 | return 0; | |
2015 | } | |
8199d3a7 | 2016 | |
559fb51b SB |
2017 | /* |
2018 | * Disables the DMA engine. | |
2019 | */ | |
2020 | void t1_sge_stop(struct sge *sge) | |
2021 | { | |
f1d3d38a | 2022 | int i; |
559fb51b | 2023 | writel(0, sge->adapter->regs + A_SG_CONTROL); |
f1d3d38a SH |
2024 | readl(sge->adapter->regs + A_SG_CONTROL); /* flush */ |
2025 | ||
559fb51b SB |
2026 | if (is_T2(sge->adapter)) |
2027 | del_timer_sync(&sge->espibug_timer); | |
f1d3d38a | 2028 | |
559fb51b | 2029 | del_timer_sync(&sge->tx_reclaim_timer); |
f1d3d38a SH |
2030 | if (sge->tx_sched) |
2031 | tx_sched_stop(sge); | |
2032 | ||
2033 | for (i = 0; i < MAX_NPORTS; i++) | |
2034 | if (sge->espibug_skb[i]) | |
2035 | kfree_skb(sge->espibug_skb[i]); | |
8199d3a7 CL |
2036 | } |
2037 | ||
559fb51b SB |
2038 | /* |
2039 | * Enables the DMA engine. | |
2040 | */ | |
2041 | void t1_sge_start(struct sge *sge) | |
8199d3a7 | 2042 | { |
559fb51b SB |
2043 | refill_free_list(sge, &sge->freelQ[0]); |
2044 | refill_free_list(sge, &sge->freelQ[1]); | |
2045 | ||
2046 | writel(sge->sge_control, sge->adapter->regs + A_SG_CONTROL); | |
2047 | doorbell_pio(sge->adapter, F_FL0_ENABLE | F_FL1_ENABLE); | |
f1d3d38a | 2048 | readl(sge->adapter->regs + A_SG_CONTROL); /* flush */ |
559fb51b SB |
2049 | |
2050 | mod_timer(&sge->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); | |
2051 | ||
f1d3d38a | 2052 | if (is_T2(sge->adapter)) |
559fb51b SB |
2053 | mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); |
2054 | } | |
2055 | ||
2056 | /* | |
2057 | * Callback for the T2 ESPI 'stuck packet feature' workaorund | |
2058 | */ | |
f1d3d38a | 2059 | static void espibug_workaround_t204(unsigned long data) |
559fb51b SB |
2060 | { |
2061 | struct adapter *adapter = (struct adapter *)data; | |
8199d3a7 | 2062 | struct sge *sge = adapter->sge; |
f1d3d38a SH |
2063 | unsigned int nports = adapter->params.nports; |
2064 | u32 seop[MAX_NPORTS]; | |
8199d3a7 | 2065 | |
f1d3d38a SH |
2066 | if (adapter->open_device_map & PORT_MASK) { |
2067 | int i; | |
356bd146 FR |
2068 | |
2069 | if (t1_espi_get_mon_t204(adapter, &(seop[0]), 0) < 0) | |
f1d3d38a | 2070 | return; |
356bd146 | 2071 | |
f1d3d38a | 2072 | for (i = 0; i < nports; i++) { |
356bd146 FR |
2073 | struct sk_buff *skb = sge->espibug_skb[i]; |
2074 | ||
2075 | if (!netif_running(adapter->port[i].dev) || | |
2076 | netif_queue_stopped(adapter->port[i].dev) || | |
2077 | !seop[i] || ((seop[i] & 0xfff) != 0) || !skb) | |
2078 | continue; | |
2079 | ||
2080 | if (!skb->cb[0]) { | |
2081 | u8 ch_mac_addr[ETH_ALEN] = { | |
2082 | 0x0, 0x7, 0x43, 0x0, 0x0, 0x0 | |
2083 | }; | |
2084 | ||
27d7ff46 ACM |
2085 | skb_copy_to_linear_data_offset(skb, |
2086 | sizeof(struct cpl_tx_pkt), | |
2087 | ch_mac_addr, | |
2088 | ETH_ALEN); | |
2089 | skb_copy_to_linear_data_offset(skb, | |
2090 | skb->len - 10, | |
2091 | ch_mac_addr, | |
2092 | ETH_ALEN); | |
356bd146 | 2093 | skb->cb[0] = 0xff; |
559fb51b | 2094 | } |
356bd146 FR |
2095 | |
2096 | /* bump the reference count to avoid freeing of | |
2097 | * the skb once the DMA has completed. | |
2098 | */ | |
2099 | skb = skb_get(skb); | |
2100 | t1_sge_tx(skb, adapter, 0, adapter->port[i].dev); | |
559fb51b SB |
2101 | } |
2102 | } | |
2103 | mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); | |
8199d3a7 CL |
2104 | } |
2105 | ||
f1d3d38a SH |
2106 | static void espibug_workaround(unsigned long data) |
2107 | { | |
2108 | struct adapter *adapter = (struct adapter *)data; | |
2109 | struct sge *sge = adapter->sge; | |
2110 | ||
2111 | if (netif_running(adapter->port[0].dev)) { | |
2112 | struct sk_buff *skb = sge->espibug_skb[0]; | |
2113 | u32 seop = t1_espi_get_mon(adapter, 0x930, 0); | |
2114 | ||
2115 | if ((seop & 0xfff0fff) == 0xfff && skb) { | |
2116 | if (!skb->cb[0]) { | |
2117 | u8 ch_mac_addr[ETH_ALEN] = | |
2118 | {0x0, 0x7, 0x43, 0x0, 0x0, 0x0}; | |
27d7ff46 ACM |
2119 | skb_copy_to_linear_data_offset(skb, |
2120 | sizeof(struct cpl_tx_pkt), | |
2121 | ch_mac_addr, | |
2122 | ETH_ALEN); | |
2123 | skb_copy_to_linear_data_offset(skb, | |
2124 | skb->len - 10, | |
2125 | ch_mac_addr, | |
2126 | ETH_ALEN); | |
f1d3d38a SH |
2127 | skb->cb[0] = 0xff; |
2128 | } | |
2129 | ||
2130 | /* bump the reference count to avoid freeing of the | |
2131 | * skb once the DMA has completed. | |
2132 | */ | |
2133 | skb = skb_get(skb); | |
2134 | t1_sge_tx(skb, adapter, 0, adapter->port[0].dev); | |
2135 | } | |
2136 | } | |
2137 | mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); | |
2138 | } | |
2139 | ||
559fb51b SB |
2140 | /* |
2141 | * Creates a t1_sge structure and returns suggested resource parameters. | |
2142 | */ | |
2143 | struct sge * __devinit t1_sge_create(struct adapter *adapter, | |
2144 | struct sge_params *p) | |
2145 | { | |
cbee9f91 | 2146 | struct sge *sge = kzalloc(sizeof(*sge), GFP_KERNEL); |
56f643c2 | 2147 | int i; |
559fb51b SB |
2148 | |
2149 | if (!sge) | |
2150 | return NULL; | |
559fb51b SB |
2151 | |
2152 | sge->adapter = adapter; | |
2153 | sge->netdev = adapter->port[0].dev; | |
2154 | sge->rx_pkt_pad = t1_is_T1B(adapter) ? 0 : 2; | |
2155 | sge->jumbo_fl = t1_is_T1B(adapter) ? 1 : 0; | |
2156 | ||
56f643c2 SH |
2157 | for_each_port(adapter, i) { |
2158 | sge->port_stats[i] = alloc_percpu(struct sge_port_stats); | |
2159 | if (!sge->port_stats[i]) | |
2160 | goto nomem_port; | |
2161 | } | |
2162 | ||
559fb51b SB |
2163 | init_timer(&sge->tx_reclaim_timer); |
2164 | sge->tx_reclaim_timer.data = (unsigned long)sge; | |
2165 | sge->tx_reclaim_timer.function = sge_tx_reclaim_cb; | |
2166 | ||
2167 | if (is_T2(sge->adapter)) { | |
2168 | init_timer(&sge->espibug_timer); | |
f1d3d38a SH |
2169 | |
2170 | if (adapter->params.nports > 1) { | |
2171 | tx_sched_init(sge); | |
2172 | sge->espibug_timer.function = espibug_workaround_t204; | |
d7487421 | 2173 | } else |
f1d3d38a | 2174 | sge->espibug_timer.function = espibug_workaround; |
559fb51b | 2175 | sge->espibug_timer.data = (unsigned long)sge->adapter; |
f1d3d38a | 2176 | |
559fb51b | 2177 | sge->espibug_timeout = 1; |
f1d3d38a SH |
2178 | /* for T204, every 10ms */ |
2179 | if (adapter->params.nports > 1) | |
2180 | sge->espibug_timeout = HZ/100; | |
559fb51b | 2181 | } |
356bd146 | 2182 | |
559fb51b SB |
2183 | |
2184 | p->cmdQ_size[0] = SGE_CMDQ0_E_N; | |
2185 | p->cmdQ_size[1] = SGE_CMDQ1_E_N; | |
2186 | p->freelQ_size[!sge->jumbo_fl] = SGE_FREEL_SIZE; | |
2187 | p->freelQ_size[sge->jumbo_fl] = SGE_JUMBO_FREEL_SIZE; | |
f1d3d38a SH |
2188 | if (sge->tx_sched) { |
2189 | if (board_info(sge->adapter)->board == CHBT_BOARD_CHT204) | |
2190 | p->rx_coalesce_usecs = 15; | |
2191 | else | |
2192 | p->rx_coalesce_usecs = 50; | |
2193 | } else | |
2194 | p->rx_coalesce_usecs = 50; | |
2195 | ||
559fb51b SB |
2196 | p->coalesce_enable = 0; |
2197 | p->sample_interval_usecs = 0; | |
559fb51b SB |
2198 | |
2199 | return sge; | |
56f643c2 SH |
2200 | nomem_port: |
2201 | while (i >= 0) { | |
2202 | free_percpu(sge->port_stats[i]); | |
2203 | --i; | |
2204 | } | |
2205 | kfree(sge); | |
2206 | return NULL; | |
2207 | ||
559fb51b | 2208 | } |