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[deliverable/linux.git] / drivers / infiniband / hw / cxgb3 / cxio_hal.c
1 /*
2 * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32 #include <asm/delay.h>
33
34 #include <linux/mutex.h>
35 #include <linux/netdevice.h>
36 #include <linux/sched.h>
37 #include <linux/spinlock.h>
38 #include <linux/pci.h>
39 #include <linux/dma-mapping.h>
40
41 #include "cxio_resource.h"
42 #include "cxio_hal.h"
43 #include "cxgb3_offload.h"
44 #include "sge_defs.h"
45
46 static LIST_HEAD(rdev_list);
47 static cxio_hal_ev_callback_func_t cxio_ev_cb = NULL;
48
49 static struct cxio_rdev *cxio_hal_find_rdev_by_name(char *dev_name)
50 {
51 struct cxio_rdev *rdev;
52
53 list_for_each_entry(rdev, &rdev_list, entry)
54 if (!strcmp(rdev->dev_name, dev_name))
55 return rdev;
56 return NULL;
57 }
58
59 static struct cxio_rdev *cxio_hal_find_rdev_by_t3cdev(struct t3cdev *tdev)
60 {
61 struct cxio_rdev *rdev;
62
63 list_for_each_entry(rdev, &rdev_list, entry)
64 if (rdev->t3cdev_p == tdev)
65 return rdev;
66 return NULL;
67 }
68
69 int cxio_hal_cq_op(struct cxio_rdev *rdev_p, struct t3_cq *cq,
70 enum t3_cq_opcode op, u32 credit)
71 {
72 int ret;
73 struct t3_cqe *cqe;
74 u32 rptr;
75
76 struct rdma_cq_op setup;
77 setup.id = cq->cqid;
78 setup.credits = (op == CQ_CREDIT_UPDATE) ? credit : 0;
79 setup.op = op;
80 ret = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_OP, &setup);
81
82 if ((ret < 0) || (op == CQ_CREDIT_UPDATE))
83 return ret;
84
85 /*
86 * If the rearm returned an index other than our current index,
87 * then there might be CQE's in flight (being DMA'd). We must wait
88 * here for them to complete or the consumer can miss a notification.
89 */
90 if (Q_PTR2IDX((cq->rptr), cq->size_log2) != ret) {
91 int i=0;
92
93 rptr = cq->rptr;
94
95 /*
96 * Keep the generation correct by bumping rptr until it
97 * matches the index returned by the rearm - 1.
98 */
99 while (Q_PTR2IDX((rptr+1), cq->size_log2) != ret)
100 rptr++;
101
102 /*
103 * Now rptr is the index for the (last) cqe that was
104 * in-flight at the time the HW rearmed the CQ. We
105 * spin until that CQE is valid.
106 */
107 cqe = cq->queue + Q_PTR2IDX(rptr, cq->size_log2);
108 while (!CQ_VLD_ENTRY(rptr, cq->size_log2, cqe)) {
109 udelay(1);
110 if (i++ > 1000000) {
111 BUG_ON(1);
112 printk(KERN_ERR "%s: stalled rnic\n",
113 rdev_p->dev_name);
114 return -EIO;
115 }
116 }
117
118 return 1;
119 }
120
121 return 0;
122 }
123
124 static int cxio_hal_clear_cq_ctx(struct cxio_rdev *rdev_p, u32 cqid)
125 {
126 struct rdma_cq_setup setup;
127 setup.id = cqid;
128 setup.base_addr = 0; /* NULL address */
129 setup.size = 0; /* disaable the CQ */
130 setup.credits = 0;
131 setup.credit_thres = 0;
132 setup.ovfl_mode = 0;
133 return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
134 }
135
136 static int cxio_hal_clear_qp_ctx(struct cxio_rdev *rdev_p, u32 qpid)
137 {
138 u64 sge_cmd;
139 struct t3_modify_qp_wr *wqe;
140 struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
141 if (!skb) {
142 PDBG("%s alloc_skb failed\n", __FUNCTION__);
143 return -ENOMEM;
144 }
145 wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
146 memset(wqe, 0, sizeof(*wqe));
147 build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 3, 0, qpid, 7);
148 wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
149 sge_cmd = qpid << 8 | 3;
150 wqe->sge_cmd = cpu_to_be64(sge_cmd);
151 skb->priority = CPL_PRIORITY_CONTROL;
152 return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
153 }
154
155 int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
156 {
157 struct rdma_cq_setup setup;
158 int size = (1UL << (cq->size_log2)) * sizeof(struct t3_cqe);
159
160 cq->cqid = cxio_hal_get_cqid(rdev_p->rscp);
161 if (!cq->cqid)
162 return -ENOMEM;
163 cq->sw_queue = kzalloc(size, GFP_KERNEL);
164 if (!cq->sw_queue)
165 return -ENOMEM;
166 cq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
167 (1UL << (cq->size_log2)) *
168 sizeof(struct t3_cqe),
169 &(cq->dma_addr), GFP_KERNEL);
170 if (!cq->queue) {
171 kfree(cq->sw_queue);
172 return -ENOMEM;
173 }
174 pci_unmap_addr_set(cq, mapping, cq->dma_addr);
175 memset(cq->queue, 0, size);
176 setup.id = cq->cqid;
177 setup.base_addr = (u64) (cq->dma_addr);
178 setup.size = 1UL << cq->size_log2;
179 setup.credits = 65535;
180 setup.credit_thres = 1;
181 if (rdev_p->t3cdev_p->type == T3B)
182 setup.ovfl_mode = 0;
183 else
184 setup.ovfl_mode = 1;
185 return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
186 }
187
188 int cxio_resize_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
189 {
190 struct rdma_cq_setup setup;
191 setup.id = cq->cqid;
192 setup.base_addr = (u64) (cq->dma_addr);
193 setup.size = 1UL << cq->size_log2;
194 setup.credits = setup.size;
195 setup.credit_thres = setup.size; /* TBD: overflow recovery */
196 setup.ovfl_mode = 1;
197 return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
198 }
199
200 static u32 get_qpid(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
201 {
202 struct cxio_qpid_list *entry;
203 u32 qpid;
204 int i;
205
206 mutex_lock(&uctx->lock);
207 if (!list_empty(&uctx->qpids)) {
208 entry = list_entry(uctx->qpids.next, struct cxio_qpid_list,
209 entry);
210 list_del(&entry->entry);
211 qpid = entry->qpid;
212 kfree(entry);
213 } else {
214 qpid = cxio_hal_get_qpid(rdev_p->rscp);
215 if (!qpid)
216 goto out;
217 for (i = qpid+1; i & rdev_p->qpmask; i++) {
218 entry = kmalloc(sizeof *entry, GFP_KERNEL);
219 if (!entry)
220 break;
221 entry->qpid = i;
222 list_add_tail(&entry->entry, &uctx->qpids);
223 }
224 }
225 out:
226 mutex_unlock(&uctx->lock);
227 PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
228 return qpid;
229 }
230
231 static void put_qpid(struct cxio_rdev *rdev_p, u32 qpid,
232 struct cxio_ucontext *uctx)
233 {
234 struct cxio_qpid_list *entry;
235
236 entry = kmalloc(sizeof *entry, GFP_KERNEL);
237 if (!entry)
238 return;
239 PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
240 entry->qpid = qpid;
241 mutex_lock(&uctx->lock);
242 list_add_tail(&entry->entry, &uctx->qpids);
243 mutex_unlock(&uctx->lock);
244 }
245
246 void cxio_release_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
247 {
248 struct list_head *pos, *nxt;
249 struct cxio_qpid_list *entry;
250
251 mutex_lock(&uctx->lock);
252 list_for_each_safe(pos, nxt, &uctx->qpids) {
253 entry = list_entry(pos, struct cxio_qpid_list, entry);
254 list_del_init(&entry->entry);
255 if (!(entry->qpid & rdev_p->qpmask))
256 cxio_hal_put_qpid(rdev_p->rscp, entry->qpid);
257 kfree(entry);
258 }
259 mutex_unlock(&uctx->lock);
260 }
261
262 void cxio_init_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
263 {
264 INIT_LIST_HEAD(&uctx->qpids);
265 mutex_init(&uctx->lock);
266 }
267
268 int cxio_create_qp(struct cxio_rdev *rdev_p, u32 kernel_domain,
269 struct t3_wq *wq, struct cxio_ucontext *uctx)
270 {
271 int depth = 1UL << wq->size_log2;
272 int rqsize = 1UL << wq->rq_size_log2;
273
274 wq->qpid = get_qpid(rdev_p, uctx);
275 if (!wq->qpid)
276 return -ENOMEM;
277
278 wq->rq = kzalloc(depth * sizeof(u64), GFP_KERNEL);
279 if (!wq->rq)
280 goto err1;
281
282 wq->rq_addr = cxio_hal_rqtpool_alloc(rdev_p, rqsize);
283 if (!wq->rq_addr)
284 goto err2;
285
286 wq->sq = kzalloc(depth * sizeof(struct t3_swsq), GFP_KERNEL);
287 if (!wq->sq)
288 goto err3;
289
290 wq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
291 depth * sizeof(union t3_wr),
292 &(wq->dma_addr), GFP_KERNEL);
293 if (!wq->queue)
294 goto err4;
295
296 memset(wq->queue, 0, depth * sizeof(union t3_wr));
297 pci_unmap_addr_set(wq, mapping, wq->dma_addr);
298 wq->doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
299 if (!kernel_domain)
300 wq->udb = (u64)rdev_p->rnic_info.udbell_physbase +
301 (wq->qpid << rdev_p->qpshift);
302 PDBG("%s qpid 0x%x doorbell 0x%p udb 0x%llx\n", __FUNCTION__,
303 wq->qpid, wq->doorbell, (unsigned long long) wq->udb);
304 return 0;
305 err4:
306 kfree(wq->sq);
307 err3:
308 cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, rqsize);
309 err2:
310 kfree(wq->rq);
311 err1:
312 put_qpid(rdev_p, wq->qpid, uctx);
313 return -ENOMEM;
314 }
315
316 int cxio_destroy_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
317 {
318 int err;
319 err = cxio_hal_clear_cq_ctx(rdev_p, cq->cqid);
320 kfree(cq->sw_queue);
321 dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
322 (1UL << (cq->size_log2))
323 * sizeof(struct t3_cqe), cq->queue,
324 pci_unmap_addr(cq, mapping));
325 cxio_hal_put_cqid(rdev_p->rscp, cq->cqid);
326 return err;
327 }
328
329 int cxio_destroy_qp(struct cxio_rdev *rdev_p, struct t3_wq *wq,
330 struct cxio_ucontext *uctx)
331 {
332 dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
333 (1UL << (wq->size_log2))
334 * sizeof(union t3_wr), wq->queue,
335 pci_unmap_addr(wq, mapping));
336 kfree(wq->sq);
337 cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, (1UL << wq->rq_size_log2));
338 kfree(wq->rq);
339 put_qpid(rdev_p, wq->qpid, uctx);
340 return 0;
341 }
342
343 static void insert_recv_cqe(struct t3_wq *wq, struct t3_cq *cq)
344 {
345 struct t3_cqe cqe;
346
347 PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __FUNCTION__,
348 wq, cq, cq->sw_rptr, cq->sw_wptr);
349 memset(&cqe, 0, sizeof(cqe));
350 cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
351 V_CQE_OPCODE(T3_SEND) |
352 V_CQE_TYPE(0) |
353 V_CQE_SWCQE(1) |
354 V_CQE_QPID(wq->qpid) |
355 V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
356 cq->size_log2)));
357 *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
358 cq->sw_wptr++;
359 }
360
361 void cxio_flush_rq(struct t3_wq *wq, struct t3_cq *cq, int count)
362 {
363 u32 ptr;
364
365 PDBG("%s wq %p cq %p\n", __FUNCTION__, wq, cq);
366
367 /* flush RQ */
368 PDBG("%s rq_rptr %u rq_wptr %u skip count %u\n", __FUNCTION__,
369 wq->rq_rptr, wq->rq_wptr, count);
370 ptr = wq->rq_rptr + count;
371 while (ptr++ != wq->rq_wptr)
372 insert_recv_cqe(wq, cq);
373 }
374
375 static void insert_sq_cqe(struct t3_wq *wq, struct t3_cq *cq,
376 struct t3_swsq *sqp)
377 {
378 struct t3_cqe cqe;
379
380 PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __FUNCTION__,
381 wq, cq, cq->sw_rptr, cq->sw_wptr);
382 memset(&cqe, 0, sizeof(cqe));
383 cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
384 V_CQE_OPCODE(sqp->opcode) |
385 V_CQE_TYPE(1) |
386 V_CQE_SWCQE(1) |
387 V_CQE_QPID(wq->qpid) |
388 V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
389 cq->size_log2)));
390 cqe.u.scqe.wrid_hi = sqp->sq_wptr;
391
392 *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
393 cq->sw_wptr++;
394 }
395
396 void cxio_flush_sq(struct t3_wq *wq, struct t3_cq *cq, int count)
397 {
398 __u32 ptr;
399 struct t3_swsq *sqp = wq->sq + Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2);
400
401 ptr = wq->sq_rptr + count;
402 sqp += count;
403 while (ptr != wq->sq_wptr) {
404 insert_sq_cqe(wq, cq, sqp);
405 sqp++;
406 ptr++;
407 }
408 }
409
410 /*
411 * Move all CQEs from the HWCQ into the SWCQ.
412 */
413 void cxio_flush_hw_cq(struct t3_cq *cq)
414 {
415 struct t3_cqe *cqe, *swcqe;
416
417 PDBG("%s cq %p cqid 0x%x\n", __FUNCTION__, cq, cq->cqid);
418 cqe = cxio_next_hw_cqe(cq);
419 while (cqe) {
420 PDBG("%s flushing hwcq rptr 0x%x to swcq wptr 0x%x\n",
421 __FUNCTION__, cq->rptr, cq->sw_wptr);
422 swcqe = cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2);
423 *swcqe = *cqe;
424 swcqe->header |= cpu_to_be32(V_CQE_SWCQE(1));
425 cq->sw_wptr++;
426 cq->rptr++;
427 cqe = cxio_next_hw_cqe(cq);
428 }
429 }
430
431 static int cqe_completes_wr(struct t3_cqe *cqe, struct t3_wq *wq)
432 {
433 if (CQE_OPCODE(*cqe) == T3_TERMINATE)
434 return 0;
435
436 if ((CQE_OPCODE(*cqe) == T3_RDMA_WRITE) && RQ_TYPE(*cqe))
437 return 0;
438
439 if ((CQE_OPCODE(*cqe) == T3_READ_RESP) && SQ_TYPE(*cqe))
440 return 0;
441
442 if ((CQE_OPCODE(*cqe) == T3_SEND) && RQ_TYPE(*cqe) &&
443 Q_EMPTY(wq->rq_rptr, wq->rq_wptr))
444 return 0;
445
446 return 1;
447 }
448
449 void cxio_count_scqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
450 {
451 struct t3_cqe *cqe;
452 u32 ptr;
453
454 *count = 0;
455 ptr = cq->sw_rptr;
456 while (!Q_EMPTY(ptr, cq->sw_wptr)) {
457 cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
458 if ((SQ_TYPE(*cqe) || (CQE_OPCODE(*cqe) == T3_READ_RESP)) &&
459 (CQE_QPID(*cqe) == wq->qpid))
460 (*count)++;
461 ptr++;
462 }
463 PDBG("%s cq %p count %d\n", __FUNCTION__, cq, *count);
464 }
465
466 void cxio_count_rcqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
467 {
468 struct t3_cqe *cqe;
469 u32 ptr;
470
471 *count = 0;
472 PDBG("%s count zero %d\n", __FUNCTION__, *count);
473 ptr = cq->sw_rptr;
474 while (!Q_EMPTY(ptr, cq->sw_wptr)) {
475 cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
476 if (RQ_TYPE(*cqe) && (CQE_OPCODE(*cqe) != T3_READ_RESP) &&
477 (CQE_QPID(*cqe) == wq->qpid) && cqe_completes_wr(cqe, wq))
478 (*count)++;
479 ptr++;
480 }
481 PDBG("%s cq %p count %d\n", __FUNCTION__, cq, *count);
482 }
483
484 static int cxio_hal_init_ctrl_cq(struct cxio_rdev *rdev_p)
485 {
486 struct rdma_cq_setup setup;
487 setup.id = 0;
488 setup.base_addr = 0; /* NULL address */
489 setup.size = 1; /* enable the CQ */
490 setup.credits = 0;
491
492 /* force SGE to redirect to RspQ and interrupt */
493 setup.credit_thres = 0;
494 setup.ovfl_mode = 1;
495 return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
496 }
497
498 static int cxio_hal_init_ctrl_qp(struct cxio_rdev *rdev_p)
499 {
500 int err;
501 u64 sge_cmd, ctx0, ctx1;
502 u64 base_addr;
503 struct t3_modify_qp_wr *wqe;
504 struct sk_buff *skb;
505
506 skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
507 if (!skb) {
508 PDBG("%s alloc_skb failed\n", __FUNCTION__);
509 return -ENOMEM;
510 }
511 err = cxio_hal_init_ctrl_cq(rdev_p);
512 if (err) {
513 PDBG("%s err %d initializing ctrl_cq\n", __FUNCTION__, err);
514 goto err;
515 }
516 rdev_p->ctrl_qp.workq = dma_alloc_coherent(
517 &(rdev_p->rnic_info.pdev->dev),
518 (1 << T3_CTRL_QP_SIZE_LOG2) *
519 sizeof(union t3_wr),
520 &(rdev_p->ctrl_qp.dma_addr),
521 GFP_KERNEL);
522 if (!rdev_p->ctrl_qp.workq) {
523 PDBG("%s dma_alloc_coherent failed\n", __FUNCTION__);
524 err = -ENOMEM;
525 goto err;
526 }
527 pci_unmap_addr_set(&rdev_p->ctrl_qp, mapping,
528 rdev_p->ctrl_qp.dma_addr);
529 rdev_p->ctrl_qp.doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
530 memset(rdev_p->ctrl_qp.workq, 0,
531 (1 << T3_CTRL_QP_SIZE_LOG2) * sizeof(union t3_wr));
532
533 mutex_init(&rdev_p->ctrl_qp.lock);
534 init_waitqueue_head(&rdev_p->ctrl_qp.waitq);
535
536 /* update HW Ctrl QP context */
537 base_addr = rdev_p->ctrl_qp.dma_addr;
538 base_addr >>= 12;
539 ctx0 = (V_EC_SIZE((1 << T3_CTRL_QP_SIZE_LOG2)) |
540 V_EC_BASE_LO((u32) base_addr & 0xffff));
541 ctx0 <<= 32;
542 ctx0 |= V_EC_CREDITS(FW_WR_NUM);
543 base_addr >>= 16;
544 ctx1 = (u32) base_addr;
545 base_addr >>= 32;
546 ctx1 |= ((u64) (V_EC_BASE_HI((u32) base_addr & 0xf) | V_EC_RESPQ(0) |
547 V_EC_TYPE(0) | V_EC_GEN(1) |
548 V_EC_UP_TOKEN(T3_CTL_QP_TID) | F_EC_VALID)) << 32;
549 wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
550 memset(wqe, 0, sizeof(*wqe));
551 build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 0, 0,
552 T3_CTL_QP_TID, 7);
553 wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
554 sge_cmd = (3ULL << 56) | FW_RI_SGEEC_START << 8 | 3;
555 wqe->sge_cmd = cpu_to_be64(sge_cmd);
556 wqe->ctx1 = cpu_to_be64(ctx1);
557 wqe->ctx0 = cpu_to_be64(ctx0);
558 PDBG("CtrlQP dma_addr 0x%llx workq %p size %d\n",
559 (unsigned long long) rdev_p->ctrl_qp.dma_addr,
560 rdev_p->ctrl_qp.workq, 1 << T3_CTRL_QP_SIZE_LOG2);
561 skb->priority = CPL_PRIORITY_CONTROL;
562 return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
563 err:
564 kfree_skb(skb);
565 return err;
566 }
567
568 static int cxio_hal_destroy_ctrl_qp(struct cxio_rdev *rdev_p)
569 {
570 dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
571 (1UL << T3_CTRL_QP_SIZE_LOG2)
572 * sizeof(union t3_wr), rdev_p->ctrl_qp.workq,
573 pci_unmap_addr(&rdev_p->ctrl_qp, mapping));
574 return cxio_hal_clear_qp_ctx(rdev_p, T3_CTRL_QP_ID);
575 }
576
577 /* write len bytes of data into addr (32B aligned address)
578 * If data is NULL, clear len byte of memory to zero.
579 * caller aquires the ctrl_qp lock before the call
580 */
581 static int cxio_hal_ctrl_qp_write_mem(struct cxio_rdev *rdev_p, u32 addr,
582 u32 len, void *data, int completion)
583 {
584 u32 i, nr_wqe, copy_len;
585 u8 *copy_data;
586 u8 wr_len, utx_len; /* lenght in 8 byte flit */
587 enum t3_wr_flags flag;
588 __be64 *wqe;
589 u64 utx_cmd;
590 addr &= 0x7FFFFFF;
591 nr_wqe = len % 96 ? len / 96 + 1 : len / 96; /* 96B max per WQE */
592 PDBG("%s wptr 0x%x rptr 0x%x len %d, nr_wqe %d data %p addr 0x%0x\n",
593 __FUNCTION__, rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, len,
594 nr_wqe, data, addr);
595 utx_len = 3; /* in 32B unit */
596 for (i = 0; i < nr_wqe; i++) {
597 if (Q_FULL(rdev_p->ctrl_qp.rptr, rdev_p->ctrl_qp.wptr,
598 T3_CTRL_QP_SIZE_LOG2)) {
599 PDBG("%s ctrl_qp full wtpr 0x%0x rptr 0x%0x, "
600 "wait for more space i %d\n", __FUNCTION__,
601 rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, i);
602 if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
603 !Q_FULL(rdev_p->ctrl_qp.rptr,
604 rdev_p->ctrl_qp.wptr,
605 T3_CTRL_QP_SIZE_LOG2))) {
606 PDBG("%s ctrl_qp workq interrupted\n",
607 __FUNCTION__);
608 return -ERESTARTSYS;
609 }
610 PDBG("%s ctrl_qp wakeup, continue posting work request "
611 "i %d\n", __FUNCTION__, i);
612 }
613 wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
614 (1 << T3_CTRL_QP_SIZE_LOG2)));
615 flag = 0;
616 if (i == (nr_wqe - 1)) {
617 /* last WQE */
618 flag = completion ? T3_COMPLETION_FLAG : 0;
619 if (len % 32)
620 utx_len = len / 32 + 1;
621 else
622 utx_len = len / 32;
623 }
624
625 /*
626 * Force a CQE to return the credit to the workq in case
627 * we posted more than half the max QP size of WRs
628 */
629 if ((i != 0) &&
630 (i % (((1 << T3_CTRL_QP_SIZE_LOG2)) >> 1) == 0)) {
631 flag = T3_COMPLETION_FLAG;
632 PDBG("%s force completion at i %d\n", __FUNCTION__, i);
633 }
634
635 /* build the utx mem command */
636 wqe += (sizeof(struct t3_bypass_wr) >> 3);
637 utx_cmd = (T3_UTX_MEM_WRITE << 28) | (addr + i * 3);
638 utx_cmd <<= 32;
639 utx_cmd |= (utx_len << 28) | ((utx_len << 2) + 1);
640 *wqe = cpu_to_be64(utx_cmd);
641 wqe++;
642 copy_data = (u8 *) data + i * 96;
643 copy_len = len > 96 ? 96 : len;
644
645 /* clear memory content if data is NULL */
646 if (data)
647 memcpy(wqe, copy_data, copy_len);
648 else
649 memset(wqe, 0, copy_len);
650 if (copy_len % 32)
651 memset(((u8 *) wqe) + copy_len, 0,
652 32 - (copy_len % 32));
653 wr_len = ((sizeof(struct t3_bypass_wr)) >> 3) + 1 +
654 (utx_len << 2);
655 wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
656 (1 << T3_CTRL_QP_SIZE_LOG2)));
657
658 /* wptr in the WRID[31:0] */
659 ((union t3_wrid *)(wqe+1))->id0.low = rdev_p->ctrl_qp.wptr;
660
661 /*
662 * This must be the last write with a memory barrier
663 * for the genbit
664 */
665 build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_BP, flag,
666 Q_GENBIT(rdev_p->ctrl_qp.wptr,
667 T3_CTRL_QP_SIZE_LOG2), T3_CTRL_QP_ID,
668 wr_len);
669 if (flag == T3_COMPLETION_FLAG)
670 ring_doorbell(rdev_p->ctrl_qp.doorbell, T3_CTRL_QP_ID);
671 len -= 96;
672 rdev_p->ctrl_qp.wptr++;
673 }
674 return 0;
675 }
676
677 /* IN: stag key, pdid, perm, zbva, to, len, page_size, pbl, and pbl_size
678 * OUT: stag index, actual pbl_size, pbl_addr allocated.
679 * TBD: shared memory region support
680 */
681 static int __cxio_tpt_op(struct cxio_rdev *rdev_p, u32 reset_tpt_entry,
682 u32 *stag, u8 stag_state, u32 pdid,
683 enum tpt_mem_type type, enum tpt_mem_perm perm,
684 u32 zbva, u64 to, u32 len, u8 page_size, __be64 *pbl,
685 u32 *pbl_size, u32 *pbl_addr)
686 {
687 int err;
688 struct tpt_entry tpt;
689 u32 stag_idx;
690 u32 wptr;
691 int rereg = (*stag != T3_STAG_UNSET);
692
693 stag_state = stag_state > 0;
694 stag_idx = (*stag) >> 8;
695
696 if ((!reset_tpt_entry) && !(*stag != T3_STAG_UNSET)) {
697 stag_idx = cxio_hal_get_stag(rdev_p->rscp);
698 if (!stag_idx)
699 return -ENOMEM;
700 *stag = (stag_idx << 8) | ((*stag) & 0xFF);
701 }
702 PDBG("%s stag_state 0x%0x type 0x%0x pdid 0x%0x, stag_idx 0x%x\n",
703 __FUNCTION__, stag_state, type, pdid, stag_idx);
704
705 if (reset_tpt_entry)
706 cxio_hal_pblpool_free(rdev_p, *pbl_addr, *pbl_size << 3);
707 else if (!rereg) {
708 *pbl_addr = cxio_hal_pblpool_alloc(rdev_p, *pbl_size << 3);
709 if (!*pbl_addr) {
710 return -ENOMEM;
711 }
712 }
713
714 mutex_lock(&rdev_p->ctrl_qp.lock);
715
716 /* write PBL first if any - update pbl only if pbl list exist */
717 if (pbl) {
718
719 PDBG("%s *pdb_addr 0x%x, pbl_base 0x%x, pbl_size %d\n",
720 __FUNCTION__, *pbl_addr, rdev_p->rnic_info.pbl_base,
721 *pbl_size);
722 err = cxio_hal_ctrl_qp_write_mem(rdev_p,
723 (*pbl_addr >> 5),
724 (*pbl_size << 3), pbl, 0);
725 if (err)
726 goto ret;
727 }
728
729 /* write TPT entry */
730 if (reset_tpt_entry)
731 memset(&tpt, 0, sizeof(tpt));
732 else {
733 tpt.valid_stag_pdid = cpu_to_be32(F_TPT_VALID |
734 V_TPT_STAG_KEY((*stag) & M_TPT_STAG_KEY) |
735 V_TPT_STAG_STATE(stag_state) |
736 V_TPT_STAG_TYPE(type) | V_TPT_PDID(pdid));
737 BUG_ON(page_size >= 28);
738 tpt.flags_pagesize_qpid = cpu_to_be32(V_TPT_PERM(perm) |
739 F_TPT_MW_BIND_ENABLE |
740 V_TPT_ADDR_TYPE((zbva ? TPT_ZBTO : TPT_VATO)) |
741 V_TPT_PAGE_SIZE(page_size));
742 tpt.rsvd_pbl_addr = reset_tpt_entry ? 0 :
743 cpu_to_be32(V_TPT_PBL_ADDR(PBL_OFF(rdev_p, *pbl_addr)>>3));
744 tpt.len = cpu_to_be32(len);
745 tpt.va_hi = cpu_to_be32((u32) (to >> 32));
746 tpt.va_low_or_fbo = cpu_to_be32((u32) (to & 0xFFFFFFFFULL));
747 tpt.rsvd_bind_cnt_or_pstag = 0;
748 tpt.rsvd_pbl_size = reset_tpt_entry ? 0 :
749 cpu_to_be32(V_TPT_PBL_SIZE((*pbl_size) >> 2));
750 }
751 err = cxio_hal_ctrl_qp_write_mem(rdev_p,
752 stag_idx +
753 (rdev_p->rnic_info.tpt_base >> 5),
754 sizeof(tpt), &tpt, 1);
755
756 /* release the stag index to free pool */
757 if (reset_tpt_entry)
758 cxio_hal_put_stag(rdev_p->rscp, stag_idx);
759 ret:
760 wptr = rdev_p->ctrl_qp.wptr;
761 mutex_unlock(&rdev_p->ctrl_qp.lock);
762 if (!err)
763 if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
764 SEQ32_GE(rdev_p->ctrl_qp.rptr,
765 wptr)))
766 return -ERESTARTSYS;
767 return err;
768 }
769
770 int cxio_register_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
771 enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
772 u8 page_size, __be64 *pbl, u32 *pbl_size,
773 u32 *pbl_addr)
774 {
775 *stag = T3_STAG_UNSET;
776 return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
777 zbva, to, len, page_size, pbl, pbl_size, pbl_addr);
778 }
779
780 int cxio_reregister_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
781 enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
782 u8 page_size, __be64 *pbl, u32 *pbl_size,
783 u32 *pbl_addr)
784 {
785 return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
786 zbva, to, len, page_size, pbl, pbl_size, pbl_addr);
787 }
788
789 int cxio_dereg_mem(struct cxio_rdev *rdev_p, u32 stag, u32 pbl_size,
790 u32 pbl_addr)
791 {
792 return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0, NULL,
793 &pbl_size, &pbl_addr);
794 }
795
796 int cxio_allocate_window(struct cxio_rdev *rdev_p, u32 * stag, u32 pdid)
797 {
798 u32 pbl_size = 0;
799 *stag = T3_STAG_UNSET;
800 return __cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_MW, 0, 0, 0ULL, 0, 0,
801 NULL, &pbl_size, NULL);
802 }
803
804 int cxio_deallocate_window(struct cxio_rdev *rdev_p, u32 stag)
805 {
806 return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0, NULL,
807 NULL, NULL);
808 }
809
810 int cxio_rdma_init(struct cxio_rdev *rdev_p, struct t3_rdma_init_attr *attr)
811 {
812 struct t3_rdma_init_wr *wqe;
813 struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_ATOMIC);
814 if (!skb)
815 return -ENOMEM;
816 PDBG("%s rdev_p %p\n", __FUNCTION__, rdev_p);
817 wqe = (struct t3_rdma_init_wr *) __skb_put(skb, sizeof(*wqe));
818 wqe->wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_INIT));
819 wqe->wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(attr->tid) |
820 V_FW_RIWR_LEN(sizeof(*wqe) >> 3));
821 wqe->wrid.id1 = 0;
822 wqe->qpid = cpu_to_be32(attr->qpid);
823 wqe->pdid = cpu_to_be32(attr->pdid);
824 wqe->scqid = cpu_to_be32(attr->scqid);
825 wqe->rcqid = cpu_to_be32(attr->rcqid);
826 wqe->rq_addr = cpu_to_be32(attr->rq_addr - rdev_p->rnic_info.rqt_base);
827 wqe->rq_size = cpu_to_be32(attr->rq_size);
828 wqe->mpaattrs = attr->mpaattrs;
829 wqe->qpcaps = attr->qpcaps;
830 wqe->ulpdu_size = cpu_to_be16(attr->tcp_emss);
831 wqe->flags = cpu_to_be32(attr->flags);
832 wqe->ord = cpu_to_be32(attr->ord);
833 wqe->ird = cpu_to_be32(attr->ird);
834 wqe->qp_dma_addr = cpu_to_be64(attr->qp_dma_addr);
835 wqe->qp_dma_size = cpu_to_be32(attr->qp_dma_size);
836 wqe->irs = cpu_to_be32(attr->irs);
837 skb->priority = 0; /* 0=>ToeQ; 1=>CtrlQ */
838 return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
839 }
840
841 void cxio_register_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
842 {
843 cxio_ev_cb = ev_cb;
844 }
845
846 void cxio_unregister_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
847 {
848 cxio_ev_cb = NULL;
849 }
850
851 static int cxio_hal_ev_handler(struct t3cdev *t3cdev_p, struct sk_buff *skb)
852 {
853 static int cnt;
854 struct cxio_rdev *rdev_p = NULL;
855 struct respQ_msg_t *rsp_msg = (struct respQ_msg_t *) skb->data;
856 PDBG("%d: %s cq_id 0x%x cq_ptr 0x%x genbit %0x overflow %0x an %0x"
857 " se %0x notify %0x cqbranch %0x creditth %0x\n",
858 cnt, __FUNCTION__, RSPQ_CQID(rsp_msg), RSPQ_CQPTR(rsp_msg),
859 RSPQ_GENBIT(rsp_msg), RSPQ_OVERFLOW(rsp_msg), RSPQ_AN(rsp_msg),
860 RSPQ_SE(rsp_msg), RSPQ_NOTIFY(rsp_msg), RSPQ_CQBRANCH(rsp_msg),
861 RSPQ_CREDIT_THRESH(rsp_msg));
862 PDBG("CQE: QPID 0x%0x genbit %0x type 0x%0x status 0x%0x opcode %d "
863 "len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
864 CQE_QPID(rsp_msg->cqe), CQE_GENBIT(rsp_msg->cqe),
865 CQE_TYPE(rsp_msg->cqe), CQE_STATUS(rsp_msg->cqe),
866 CQE_OPCODE(rsp_msg->cqe), CQE_LEN(rsp_msg->cqe),
867 CQE_WRID_HI(rsp_msg->cqe), CQE_WRID_LOW(rsp_msg->cqe));
868 rdev_p = (struct cxio_rdev *)t3cdev_p->ulp;
869 if (!rdev_p) {
870 PDBG("%s called by t3cdev %p with null ulp\n", __FUNCTION__,
871 t3cdev_p);
872 return 0;
873 }
874 if (CQE_QPID(rsp_msg->cqe) == T3_CTRL_QP_ID) {
875 rdev_p->ctrl_qp.rptr = CQE_WRID_LOW(rsp_msg->cqe) + 1;
876 wake_up_interruptible(&rdev_p->ctrl_qp.waitq);
877 dev_kfree_skb_irq(skb);
878 } else if (CQE_QPID(rsp_msg->cqe) == 0xfff8)
879 dev_kfree_skb_irq(skb);
880 else if (cxio_ev_cb)
881 (*cxio_ev_cb) (rdev_p, skb);
882 else
883 dev_kfree_skb_irq(skb);
884 cnt++;
885 return 0;
886 }
887
888 /* Caller takes care of locking if needed */
889 int cxio_rdev_open(struct cxio_rdev *rdev_p)
890 {
891 struct net_device *netdev_p = NULL;
892 int err = 0;
893 if (strlen(rdev_p->dev_name)) {
894 if (cxio_hal_find_rdev_by_name(rdev_p->dev_name)) {
895 return -EBUSY;
896 }
897 netdev_p = dev_get_by_name(rdev_p->dev_name);
898 if (!netdev_p) {
899 return -EINVAL;
900 }
901 dev_put(netdev_p);
902 } else if (rdev_p->t3cdev_p) {
903 if (cxio_hal_find_rdev_by_t3cdev(rdev_p->t3cdev_p)) {
904 return -EBUSY;
905 }
906 netdev_p = rdev_p->t3cdev_p->lldev;
907 strncpy(rdev_p->dev_name, rdev_p->t3cdev_p->name,
908 T3_MAX_DEV_NAME_LEN);
909 } else {
910 PDBG("%s t3cdev_p or dev_name must be set\n", __FUNCTION__);
911 return -EINVAL;
912 }
913
914 list_add_tail(&rdev_p->entry, &rdev_list);
915
916 PDBG("%s opening rnic dev %s\n", __FUNCTION__, rdev_p->dev_name);
917 memset(&rdev_p->ctrl_qp, 0, sizeof(rdev_p->ctrl_qp));
918 if (!rdev_p->t3cdev_p)
919 rdev_p->t3cdev_p = dev2t3cdev(netdev_p);
920 rdev_p->t3cdev_p->ulp = (void *) rdev_p;
921 err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_GET_PARAMS,
922 &(rdev_p->rnic_info));
923 if (err) {
924 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
925 __FUNCTION__, rdev_p->t3cdev_p, err);
926 goto err1;
927 }
928 err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_PORTS,
929 &(rdev_p->port_info));
930 if (err) {
931 printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
932 __FUNCTION__, rdev_p->t3cdev_p, err);
933 goto err1;
934 }
935
936 /*
937 * qpshift is the number of bits to shift the qpid left in order
938 * to get the correct address of the doorbell for that qp.
939 */
940 cxio_init_ucontext(rdev_p, &rdev_p->uctx);
941 rdev_p->qpshift = PAGE_SHIFT -
942 ilog2(65536 >>
943 ilog2(rdev_p->rnic_info.udbell_len >>
944 PAGE_SHIFT));
945 rdev_p->qpnr = rdev_p->rnic_info.udbell_len >> PAGE_SHIFT;
946 rdev_p->qpmask = (65536 >> ilog2(rdev_p->qpnr)) - 1;
947 PDBG("%s rnic %s info: tpt_base 0x%0x tpt_top 0x%0x num stags %d "
948 "pbl_base 0x%0x pbl_top 0x%0x rqt_base 0x%0x, rqt_top 0x%0x\n",
949 __FUNCTION__, rdev_p->dev_name, rdev_p->rnic_info.tpt_base,
950 rdev_p->rnic_info.tpt_top, cxio_num_stags(rdev_p),
951 rdev_p->rnic_info.pbl_base,
952 rdev_p->rnic_info.pbl_top, rdev_p->rnic_info.rqt_base,
953 rdev_p->rnic_info.rqt_top);
954 PDBG("udbell_len 0x%0x udbell_physbase 0x%lx kdb_addr %p qpshift %lu "
955 "qpnr %d qpmask 0x%x\n",
956 rdev_p->rnic_info.udbell_len,
957 rdev_p->rnic_info.udbell_physbase, rdev_p->rnic_info.kdb_addr,
958 rdev_p->qpshift, rdev_p->qpnr, rdev_p->qpmask);
959
960 err = cxio_hal_init_ctrl_qp(rdev_p);
961 if (err) {
962 printk(KERN_ERR "%s error %d initializing ctrl_qp.\n",
963 __FUNCTION__, err);
964 goto err1;
965 }
966 err = cxio_hal_init_resource(rdev_p, cxio_num_stags(rdev_p), 0,
967 0, T3_MAX_NUM_QP, T3_MAX_NUM_CQ,
968 T3_MAX_NUM_PD);
969 if (err) {
970 printk(KERN_ERR "%s error %d initializing hal resources.\n",
971 __FUNCTION__, err);
972 goto err2;
973 }
974 err = cxio_hal_pblpool_create(rdev_p);
975 if (err) {
976 printk(KERN_ERR "%s error %d initializing pbl mem pool.\n",
977 __FUNCTION__, err);
978 goto err3;
979 }
980 err = cxio_hal_rqtpool_create(rdev_p);
981 if (err) {
982 printk(KERN_ERR "%s error %d initializing rqt mem pool.\n",
983 __FUNCTION__, err);
984 goto err4;
985 }
986 return 0;
987 err4:
988 cxio_hal_pblpool_destroy(rdev_p);
989 err3:
990 cxio_hal_destroy_resource(rdev_p->rscp);
991 err2:
992 cxio_hal_destroy_ctrl_qp(rdev_p);
993 err1:
994 list_del(&rdev_p->entry);
995 return err;
996 }
997
998 void cxio_rdev_close(struct cxio_rdev *rdev_p)
999 {
1000 if (rdev_p) {
1001 cxio_hal_pblpool_destroy(rdev_p);
1002 cxio_hal_rqtpool_destroy(rdev_p);
1003 list_del(&rdev_p->entry);
1004 rdev_p->t3cdev_p->ulp = NULL;
1005 cxio_hal_destroy_ctrl_qp(rdev_p);
1006 cxio_hal_destroy_resource(rdev_p->rscp);
1007 }
1008 }
1009
1010 int __init cxio_hal_init(void)
1011 {
1012 if (cxio_hal_init_rhdl_resource(T3_MAX_NUM_RI))
1013 return -ENOMEM;
1014 t3_register_cpl_handler(CPL_ASYNC_NOTIF, cxio_hal_ev_handler);
1015 return 0;
1016 }
1017
1018 void __exit cxio_hal_exit(void)
1019 {
1020 struct cxio_rdev *rdev, *tmp;
1021
1022 t3_register_cpl_handler(CPL_ASYNC_NOTIF, NULL);
1023 list_for_each_entry_safe(rdev, tmp, &rdev_list, entry)
1024 cxio_rdev_close(rdev);
1025 cxio_hal_destroy_rhdl_resource();
1026 }
1027
1028 static void flush_completed_wrs(struct t3_wq *wq, struct t3_cq *cq)
1029 {
1030 struct t3_swsq *sqp;
1031 __u32 ptr = wq->sq_rptr;
1032 int count = Q_COUNT(wq->sq_rptr, wq->sq_wptr);
1033
1034 sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
1035 while (count--)
1036 if (!sqp->signaled) {
1037 ptr++;
1038 sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
1039 } else if (sqp->complete) {
1040
1041 /*
1042 * Insert this completed cqe into the swcq.
1043 */
1044 PDBG("%s moving cqe into swcq sq idx %ld cq idx %ld\n",
1045 __FUNCTION__, Q_PTR2IDX(ptr, wq->sq_size_log2),
1046 Q_PTR2IDX(cq->sw_wptr, cq->size_log2));
1047 sqp->cqe.header |= htonl(V_CQE_SWCQE(1));
1048 *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2))
1049 = sqp->cqe;
1050 cq->sw_wptr++;
1051 sqp->signaled = 0;
1052 break;
1053 } else
1054 break;
1055 }
1056
1057 static void create_read_req_cqe(struct t3_wq *wq, struct t3_cqe *hw_cqe,
1058 struct t3_cqe *read_cqe)
1059 {
1060 read_cqe->u.scqe.wrid_hi = wq->oldest_read->sq_wptr;
1061 read_cqe->len = wq->oldest_read->read_len;
1062 read_cqe->header = htonl(V_CQE_QPID(CQE_QPID(*hw_cqe)) |
1063 V_CQE_SWCQE(SW_CQE(*hw_cqe)) |
1064 V_CQE_OPCODE(T3_READ_REQ) |
1065 V_CQE_TYPE(1));
1066 }
1067
1068 /*
1069 * Return a ptr to the next read wr in the SWSQ or NULL.
1070 */
1071 static void advance_oldest_read(struct t3_wq *wq)
1072 {
1073
1074 u32 rptr = wq->oldest_read - wq->sq + 1;
1075 u32 wptr = Q_PTR2IDX(wq->sq_wptr, wq->sq_size_log2);
1076
1077 while (Q_PTR2IDX(rptr, wq->sq_size_log2) != wptr) {
1078 wq->oldest_read = wq->sq + Q_PTR2IDX(rptr, wq->sq_size_log2);
1079
1080 if (wq->oldest_read->opcode == T3_READ_REQ)
1081 return;
1082 rptr++;
1083 }
1084 wq->oldest_read = NULL;
1085 }
1086
1087 /*
1088 * cxio_poll_cq
1089 *
1090 * Caller must:
1091 * check the validity of the first CQE,
1092 * supply the wq assicated with the qpid.
1093 *
1094 * credit: cq credit to return to sge.
1095 * cqe_flushed: 1 iff the CQE is flushed.
1096 * cqe: copy of the polled CQE.
1097 *
1098 * return value:
1099 * 0 CQE returned,
1100 * -1 CQE skipped, try again.
1101 */
1102 int cxio_poll_cq(struct t3_wq *wq, struct t3_cq *cq, struct t3_cqe *cqe,
1103 u8 *cqe_flushed, u64 *cookie, u32 *credit)
1104 {
1105 int ret = 0;
1106 struct t3_cqe *hw_cqe, read_cqe;
1107
1108 *cqe_flushed = 0;
1109 *credit = 0;
1110 hw_cqe = cxio_next_cqe(cq);
1111
1112 PDBG("%s CQE OOO %d qpid 0x%0x genbit %d type %d status 0x%0x"
1113 " opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
1114 __FUNCTION__, CQE_OOO(*hw_cqe), CQE_QPID(*hw_cqe),
1115 CQE_GENBIT(*hw_cqe), CQE_TYPE(*hw_cqe), CQE_STATUS(*hw_cqe),
1116 CQE_OPCODE(*hw_cqe), CQE_LEN(*hw_cqe), CQE_WRID_HI(*hw_cqe),
1117 CQE_WRID_LOW(*hw_cqe));
1118
1119 /*
1120 * skip cqe's not affiliated with a QP.
1121 */
1122 if (wq == NULL) {
1123 ret = -1;
1124 goto skip_cqe;
1125 }
1126
1127 /*
1128 * Gotta tweak READ completions:
1129 * 1) the cqe doesn't contain the sq_wptr from the wr.
1130 * 2) opcode not reflected from the wr.
1131 * 3) read_len not reflected from the wr.
1132 * 4) cq_type is RQ_TYPE not SQ_TYPE.
1133 */
1134 if (RQ_TYPE(*hw_cqe) && (CQE_OPCODE(*hw_cqe) == T3_READ_RESP)) {
1135
1136 /*
1137 * Don't write to the HWCQ, so create a new read req CQE
1138 * in local memory.
1139 */
1140 create_read_req_cqe(wq, hw_cqe, &read_cqe);
1141 hw_cqe = &read_cqe;
1142 advance_oldest_read(wq);
1143 }
1144
1145 /*
1146 * T3A: Discard TERMINATE CQEs.
1147 */
1148 if (CQE_OPCODE(*hw_cqe) == T3_TERMINATE) {
1149 ret = -1;
1150 wq->error = 1;
1151 goto skip_cqe;
1152 }
1153
1154 if (CQE_STATUS(*hw_cqe) || wq->error) {
1155 *cqe_flushed = wq->error;
1156 wq->error = 1;
1157
1158 /*
1159 * T3A inserts errors into the CQE. We cannot return
1160 * these as work completions.
1161 */
1162 /* incoming write failures */
1163 if ((CQE_OPCODE(*hw_cqe) == T3_RDMA_WRITE)
1164 && RQ_TYPE(*hw_cqe)) {
1165 ret = -1;
1166 goto skip_cqe;
1167 }
1168 /* incoming read request failures */
1169 if ((CQE_OPCODE(*hw_cqe) == T3_READ_RESP) && SQ_TYPE(*hw_cqe)) {
1170 ret = -1;
1171 goto skip_cqe;
1172 }
1173
1174 /* incoming SEND with no receive posted failures */
1175 if ((CQE_OPCODE(*hw_cqe) == T3_SEND) && RQ_TYPE(*hw_cqe) &&
1176 Q_EMPTY(wq->rq_rptr, wq->rq_wptr)) {
1177 ret = -1;
1178 goto skip_cqe;
1179 }
1180 goto proc_cqe;
1181 }
1182
1183 /*
1184 * RECV completion.
1185 */
1186 if (RQ_TYPE(*hw_cqe)) {
1187
1188 /*
1189 * HW only validates 4 bits of MSN. So we must validate that
1190 * the MSN in the SEND is the next expected MSN. If its not,
1191 * then we complete this with TPT_ERR_MSN and mark the wq in
1192 * error.
1193 */
1194 if (unlikely((CQE_WRID_MSN(*hw_cqe) != (wq->rq_rptr + 1)))) {
1195 wq->error = 1;
1196 hw_cqe->header |= htonl(V_CQE_STATUS(TPT_ERR_MSN));
1197 goto proc_cqe;
1198 }
1199 goto proc_cqe;
1200 }
1201
1202 /*
1203 * If we get here its a send completion.
1204 *
1205 * Handle out of order completion. These get stuffed
1206 * in the SW SQ. Then the SW SQ is walked to move any
1207 * now in-order completions into the SW CQ. This handles
1208 * 2 cases:
1209 * 1) reaping unsignaled WRs when the first subsequent
1210 * signaled WR is completed.
1211 * 2) out of order read completions.
1212 */
1213 if (!SW_CQE(*hw_cqe) && (CQE_WRID_SQ_WPTR(*hw_cqe) != wq->sq_rptr)) {
1214 struct t3_swsq *sqp;
1215
1216 PDBG("%s out of order completion going in swsq at idx %ld\n",
1217 __FUNCTION__,
1218 Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2));
1219 sqp = wq->sq +
1220 Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2);
1221 sqp->cqe = *hw_cqe;
1222 sqp->complete = 1;
1223 ret = -1;
1224 goto flush_wq;
1225 }
1226
1227 proc_cqe:
1228 *cqe = *hw_cqe;
1229
1230 /*
1231 * Reap the associated WR(s) that are freed up with this
1232 * completion.
1233 */
1234 if (SQ_TYPE(*hw_cqe)) {
1235 wq->sq_rptr = CQE_WRID_SQ_WPTR(*hw_cqe);
1236 PDBG("%s completing sq idx %ld\n", __FUNCTION__,
1237 Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2));
1238 *cookie = (wq->sq +
1239 Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2))->wr_id;
1240 wq->sq_rptr++;
1241 } else {
1242 PDBG("%s completing rq idx %ld\n", __FUNCTION__,
1243 Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
1244 *cookie = *(wq->rq + Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
1245 wq->rq_rptr++;
1246 }
1247
1248 flush_wq:
1249 /*
1250 * Flush any completed cqes that are now in-order.
1251 */
1252 flush_completed_wrs(wq, cq);
1253
1254 skip_cqe:
1255 if (SW_CQE(*hw_cqe)) {
1256 PDBG("%s cq %p cqid 0x%x skip sw cqe sw_rptr 0x%x\n",
1257 __FUNCTION__, cq, cq->cqid, cq->sw_rptr);
1258 ++cq->sw_rptr;
1259 } else {
1260 PDBG("%s cq %p cqid 0x%x skip hw cqe rptr 0x%x\n",
1261 __FUNCTION__, cq, cq->cqid, cq->rptr);
1262 ++cq->rptr;
1263
1264 /*
1265 * T3A: compute credits.
1266 */
1267 if (((cq->rptr - cq->wptr) > (1 << (cq->size_log2 - 1)))
1268 || ((cq->rptr - cq->wptr) >= 128)) {
1269 *credit = cq->rptr - cq->wptr;
1270 cq->wptr = cq->rptr;
1271 }
1272 }
1273 return ret;
1274 }
Linux kernel - Deliverables
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