mthca_srq.c revision ab8403c424a35364a3a2c753f7c5917fcbb4d809
1/*
2 * Copyright (c) 2005 Cisco Systems. 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 * $Id: mthca_srq.c 3047 2005-08-10 03:59:35Z roland $
33 */
34
35#include <linux/slab.h>
36#include <linux/string.h>
37#include <linux/sched.h>
38
39#include <asm/io.h>
40
41#include "mthca_dev.h"
42#include "mthca_cmd.h"
43#include "mthca_memfree.h"
44#include "mthca_wqe.h"
45
46enum {
47	MTHCA_MAX_DIRECT_SRQ_SIZE = 4 * PAGE_SIZE
48};
49
50struct mthca_tavor_srq_context {
51	__be64 wqe_base_ds;	/* low 6 bits is descriptor size */
52	__be32 state_pd;
53	__be32 lkey;
54	__be32 uar;
55	__be16 limit_watermark;
56	__be16 wqe_cnt;
57	u32    reserved[2];
58};
59
60struct mthca_arbel_srq_context {
61	__be32 state_logsize_srqn;
62	__be32 lkey;
63	__be32 db_index;
64	__be32 logstride_usrpage;
65	__be64 wqe_base;
66	__be32 eq_pd;
67	__be16 limit_watermark;
68	__be16 wqe_cnt;
69	u16    reserved1;
70	__be16 wqe_counter;
71	u32    reserved2[3];
72};
73
74static void *get_wqe(struct mthca_srq *srq, int n)
75{
76	if (srq->is_direct)
77		return srq->queue.direct.buf + (n << srq->wqe_shift);
78	else
79		return srq->queue.page_list[(n << srq->wqe_shift) >> PAGE_SHIFT].buf +
80			((n << srq->wqe_shift) & (PAGE_SIZE - 1));
81}
82
83/*
84 * Return a pointer to the location within a WQE that we're using as a
85 * link when the WQE is in the free list.  We use the imm field
86 * because in the Tavor case, posting a WQE may overwrite the next
87 * segment of the previous WQE, but a receive WQE will never touch the
88 * imm field.  This avoids corrupting our free list if the previous
89 * WQE has already completed and been put on the free list when we
90 * post the next WQE.
91 */
92static inline int *wqe_to_link(void *wqe)
93{
94	return (int *) (wqe + offsetof(struct mthca_next_seg, imm));
95}
96
97static void mthca_tavor_init_srq_context(struct mthca_dev *dev,
98					 struct mthca_pd *pd,
99					 struct mthca_srq *srq,
100					 struct mthca_tavor_srq_context *context)
101{
102	memset(context, 0, sizeof *context);
103
104	context->wqe_base_ds = cpu_to_be64(1 << (srq->wqe_shift - 4));
105	context->state_pd    = cpu_to_be32(pd->pd_num);
106	context->lkey        = cpu_to_be32(srq->mr.ibmr.lkey);
107
108	if (pd->ibpd.uobject)
109		context->uar =
110			cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
111	else
112		context->uar = cpu_to_be32(dev->driver_uar.index);
113}
114
115static void mthca_arbel_init_srq_context(struct mthca_dev *dev,
116					 struct mthca_pd *pd,
117					 struct mthca_srq *srq,
118					 struct mthca_arbel_srq_context *context)
119{
120	int logsize, max;
121
122	memset(context, 0, sizeof *context);
123
124	/*
125	 * Put max in a temporary variable to work around gcc bug
126	 * triggered by ilog2() on sparc64.
127	 */
128	max = srq->max;
129	logsize = ilog2(max);
130	context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn);
131	context->lkey = cpu_to_be32(srq->mr.ibmr.lkey);
132	context->db_index = cpu_to_be32(srq->db_index);
133	context->logstride_usrpage = cpu_to_be32((srq->wqe_shift - 4) << 29);
134	if (pd->ibpd.uobject)
135		context->logstride_usrpage |=
136			cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
137	else
138		context->logstride_usrpage |= cpu_to_be32(dev->driver_uar.index);
139	context->eq_pd = cpu_to_be32(MTHCA_EQ_ASYNC << 24 | pd->pd_num);
140}
141
142static void mthca_free_srq_buf(struct mthca_dev *dev, struct mthca_srq *srq)
143{
144	mthca_buf_free(dev, srq->max << srq->wqe_shift, &srq->queue,
145		       srq->is_direct, &srq->mr);
146	kfree(srq->wrid);
147}
148
149static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd,
150			       struct mthca_srq *srq)
151{
152	struct mthca_data_seg *scatter;
153	void *wqe;
154	int err;
155	int i;
156
157	if (pd->ibpd.uobject)
158		return 0;
159
160	srq->wrid = kmalloc(srq->max * sizeof (u64), GFP_KERNEL);
161	if (!srq->wrid)
162		return -ENOMEM;
163
164	err = mthca_buf_alloc(dev, srq->max << srq->wqe_shift,
165			      MTHCA_MAX_DIRECT_SRQ_SIZE,
166			      &srq->queue, &srq->is_direct, pd, 1, &srq->mr);
167	if (err) {
168		kfree(srq->wrid);
169		return err;
170	}
171
172	/*
173	 * Now initialize the SRQ buffer so that all of the WQEs are
174	 * linked into the list of free WQEs.  In addition, set the
175	 * scatter list L_Keys to the sentry value of 0x100.
176	 */
177	for (i = 0; i < srq->max; ++i) {
178		wqe = get_wqe(srq, i);
179
180		*wqe_to_link(wqe) = i < srq->max - 1 ? i + 1 : -1;
181
182		for (scatter = wqe + sizeof (struct mthca_next_seg);
183		     (void *) scatter < wqe + (1 << srq->wqe_shift);
184		     ++scatter)
185			scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
186	}
187
188	srq->last = get_wqe(srq, srq->max - 1);
189
190	return 0;
191}
192
193int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
194		    struct ib_srq_attr *attr, struct mthca_srq *srq)
195{
196	struct mthca_mailbox *mailbox;
197	u8 status;
198	int ds;
199	int err;
200
201	/* Sanity check SRQ size before proceeding */
202	if (attr->max_wr  > dev->limits.max_srq_wqes ||
203	    attr->max_sge > dev->limits.max_srq_sge)
204		return -EINVAL;
205
206	srq->max      = attr->max_wr;
207	srq->max_gs   = attr->max_sge;
208	srq->counter  = 0;
209
210	if (mthca_is_memfree(dev))
211		srq->max = roundup_pow_of_two(srq->max + 1);
212	else
213		srq->max = srq->max + 1;
214
215	ds = max(64UL,
216		 roundup_pow_of_two(sizeof (struct mthca_next_seg) +
217				    srq->max_gs * sizeof (struct mthca_data_seg)));
218
219	if (!mthca_is_memfree(dev) && (ds > dev->limits.max_desc_sz))
220		return -EINVAL;
221
222	srq->wqe_shift = ilog2(ds);
223
224	srq->srqn = mthca_alloc(&dev->srq_table.alloc);
225	if (srq->srqn == -1)
226		return -ENOMEM;
227
228	if (mthca_is_memfree(dev)) {
229		err = mthca_table_get(dev, dev->srq_table.table, srq->srqn);
230		if (err)
231			goto err_out;
232
233		if (!pd->ibpd.uobject) {
234			srq->db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SRQ,
235						       srq->srqn, &srq->db);
236			if (srq->db_index < 0) {
237				err = -ENOMEM;
238				goto err_out_icm;
239			}
240		}
241	}
242
243	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
244	if (IS_ERR(mailbox)) {
245		err = PTR_ERR(mailbox);
246		goto err_out_db;
247	}
248
249	err = mthca_alloc_srq_buf(dev, pd, srq);
250	if (err)
251		goto err_out_mailbox;
252
253	spin_lock_init(&srq->lock);
254	srq->refcount = 1;
255	init_waitqueue_head(&srq->wait);
256	mutex_init(&srq->mutex);
257
258	if (mthca_is_memfree(dev))
259		mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf);
260	else
261		mthca_tavor_init_srq_context(dev, pd, srq, mailbox->buf);
262
263	err = mthca_SW2HW_SRQ(dev, mailbox, srq->srqn, &status);
264
265	if (err) {
266		mthca_warn(dev, "SW2HW_SRQ failed (%d)\n", err);
267		goto err_out_free_buf;
268	}
269	if (status) {
270		mthca_warn(dev, "SW2HW_SRQ returned status 0x%02x\n",
271			   status);
272		err = -EINVAL;
273		goto err_out_free_buf;
274	}
275
276	spin_lock_irq(&dev->srq_table.lock);
277	if (mthca_array_set(&dev->srq_table.srq,
278			    srq->srqn & (dev->limits.num_srqs - 1),
279			    srq)) {
280		spin_unlock_irq(&dev->srq_table.lock);
281		goto err_out_free_srq;
282	}
283	spin_unlock_irq(&dev->srq_table.lock);
284
285	mthca_free_mailbox(dev, mailbox);
286
287	srq->first_free = 0;
288	srq->last_free  = srq->max - 1;
289
290	attr->max_wr    = srq->max - 1;
291	attr->max_sge   = srq->max_gs;
292
293	return 0;
294
295err_out_free_srq:
296	err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
297	if (err)
298		mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
299	else if (status)
300		mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
301
302err_out_free_buf:
303	if (!pd->ibpd.uobject)
304		mthca_free_srq_buf(dev, srq);
305
306err_out_mailbox:
307	mthca_free_mailbox(dev, mailbox);
308
309err_out_db:
310	if (!pd->ibpd.uobject && mthca_is_memfree(dev))
311		mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
312
313err_out_icm:
314	mthca_table_put(dev, dev->srq_table.table, srq->srqn);
315
316err_out:
317	mthca_free(&dev->srq_table.alloc, srq->srqn);
318
319	return err;
320}
321
322static inline int get_srq_refcount(struct mthca_dev *dev, struct mthca_srq *srq)
323{
324	int c;
325
326	spin_lock_irq(&dev->srq_table.lock);
327	c = srq->refcount;
328	spin_unlock_irq(&dev->srq_table.lock);
329
330	return c;
331}
332
333void mthca_free_srq(struct mthca_dev *dev, struct mthca_srq *srq)
334{
335	struct mthca_mailbox *mailbox;
336	int err;
337	u8 status;
338
339	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
340	if (IS_ERR(mailbox)) {
341		mthca_warn(dev, "No memory for mailbox to free SRQ.\n");
342		return;
343	}
344
345	err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status);
346	if (err)
347		mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
348	else if (status)
349		mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status);
350
351	spin_lock_irq(&dev->srq_table.lock);
352	mthca_array_clear(&dev->srq_table.srq,
353			  srq->srqn & (dev->limits.num_srqs - 1));
354	--srq->refcount;
355	spin_unlock_irq(&dev->srq_table.lock);
356
357	wait_event(srq->wait, !get_srq_refcount(dev, srq));
358
359	if (!srq->ibsrq.uobject) {
360		mthca_free_srq_buf(dev, srq);
361		if (mthca_is_memfree(dev))
362			mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
363	}
364
365	mthca_table_put(dev, dev->srq_table.table, srq->srqn);
366	mthca_free(&dev->srq_table.alloc, srq->srqn);
367	mthca_free_mailbox(dev, mailbox);
368}
369
370int mthca_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
371		     enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
372{
373	struct mthca_dev *dev = to_mdev(ibsrq->device);
374	struct mthca_srq *srq = to_msrq(ibsrq);
375	int ret;
376	u8 status;
377
378	/* We don't support resizing SRQs (yet?) */
379	if (attr_mask & IB_SRQ_MAX_WR)
380		return -EINVAL;
381
382	if (attr_mask & IB_SRQ_LIMIT) {
383		u32 max_wr = mthca_is_memfree(dev) ? srq->max - 1 : srq->max;
384		if (attr->srq_limit > max_wr)
385			return -EINVAL;
386
387		mutex_lock(&srq->mutex);
388		ret = mthca_ARM_SRQ(dev, srq->srqn, attr->srq_limit, &status);
389		mutex_unlock(&srq->mutex);
390
391		if (ret)
392			return ret;
393		if (status)
394			return -EINVAL;
395	}
396
397	return 0;
398}
399
400int mthca_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
401{
402	struct mthca_dev *dev = to_mdev(ibsrq->device);
403	struct mthca_srq *srq = to_msrq(ibsrq);
404	struct mthca_mailbox *mailbox;
405	struct mthca_arbel_srq_context *arbel_ctx;
406	struct mthca_tavor_srq_context *tavor_ctx;
407	u8 status;
408	int err;
409
410	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
411	if (IS_ERR(mailbox))
412		return PTR_ERR(mailbox);
413
414	err = mthca_QUERY_SRQ(dev, srq->srqn, mailbox, &status);
415	if (err)
416		goto out;
417
418	if (mthca_is_memfree(dev)) {
419		arbel_ctx = mailbox->buf;
420		srq_attr->srq_limit = be16_to_cpu(arbel_ctx->limit_watermark);
421	} else {
422		tavor_ctx = mailbox->buf;
423		srq_attr->srq_limit = be16_to_cpu(tavor_ctx->limit_watermark);
424	}
425
426	srq_attr->max_wr  = srq->max - 1;
427	srq_attr->max_sge = srq->max_gs;
428
429out:
430	mthca_free_mailbox(dev, mailbox);
431
432	return err;
433}
434
435void mthca_srq_event(struct mthca_dev *dev, u32 srqn,
436		     enum ib_event_type event_type)
437{
438	struct mthca_srq *srq;
439	struct ib_event event;
440
441	spin_lock(&dev->srq_table.lock);
442	srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1));
443	if (srq)
444		++srq->refcount;
445	spin_unlock(&dev->srq_table.lock);
446
447	if (!srq) {
448		mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
449		return;
450	}
451
452	if (!srq->ibsrq.event_handler)
453		goto out;
454
455	event.device      = &dev->ib_dev;
456	event.event       = event_type;
457	event.element.srq = &srq->ibsrq;
458	srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context);
459
460out:
461	spin_lock(&dev->srq_table.lock);
462	if (!--srq->refcount)
463		wake_up(&srq->wait);
464	spin_unlock(&dev->srq_table.lock);
465}
466
467/*
468 * This function must be called with IRQs disabled.
469 */
470void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr)
471{
472	int ind;
473
474	ind = wqe_addr >> srq->wqe_shift;
475
476	spin_lock(&srq->lock);
477
478	if (likely(srq->first_free >= 0))
479		*wqe_to_link(get_wqe(srq, srq->last_free)) = ind;
480	else
481		srq->first_free = ind;
482
483	*wqe_to_link(get_wqe(srq, ind)) = -1;
484	srq->last_free = ind;
485
486	spin_unlock(&srq->lock);
487}
488
489int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
490			      struct ib_recv_wr **bad_wr)
491{
492	struct mthca_dev *dev = to_mdev(ibsrq->device);
493	struct mthca_srq *srq = to_msrq(ibsrq);
494	unsigned long flags;
495	int err = 0;
496	int first_ind;
497	int ind;
498	int next_ind;
499	int nreq;
500	int i;
501	void *wqe;
502	void *prev_wqe;
503
504	spin_lock_irqsave(&srq->lock, flags);
505
506	first_ind = srq->first_free;
507
508	for (nreq = 0; wr; wr = wr->next) {
509		ind = srq->first_free;
510
511		if (unlikely(ind < 0)) {
512			mthca_err(dev, "SRQ %06x full\n", srq->srqn);
513			err = -ENOMEM;
514			*bad_wr = wr;
515			break;
516		}
517
518		wqe       = get_wqe(srq, ind);
519		next_ind  = *wqe_to_link(wqe);
520
521		if (unlikely(next_ind < 0)) {
522			mthca_err(dev, "SRQ %06x full\n", srq->srqn);
523			err = -ENOMEM;
524			*bad_wr = wr;
525			break;
526		}
527
528		prev_wqe  = srq->last;
529		srq->last = wqe;
530
531		((struct mthca_next_seg *) wqe)->nda_op = 0;
532		((struct mthca_next_seg *) wqe)->ee_nds = 0;
533		/* flags field will always remain 0 */
534
535		wqe += sizeof (struct mthca_next_seg);
536
537		if (unlikely(wr->num_sge > srq->max_gs)) {
538			err = -EINVAL;
539			*bad_wr = wr;
540			srq->last = prev_wqe;
541			break;
542		}
543
544		for (i = 0; i < wr->num_sge; ++i) {
545			mthca_set_data_seg(wqe, wr->sg_list + i);
546			wqe += sizeof (struct mthca_data_seg);
547		}
548
549		if (i < srq->max_gs)
550			mthca_set_data_seg_inval(wqe);
551
552		((struct mthca_next_seg *) prev_wqe)->nda_op =
553			cpu_to_be32((ind << srq->wqe_shift) | 1);
554		wmb();
555		((struct mthca_next_seg *) prev_wqe)->ee_nds =
556			cpu_to_be32(MTHCA_NEXT_DBD);
557
558		srq->wrid[ind]  = wr->wr_id;
559		srq->first_free = next_ind;
560
561		++nreq;
562		if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
563			nreq = 0;
564
565			/*
566			 * Make sure that descriptors are written
567			 * before doorbell is rung.
568			 */
569			wmb();
570
571			mthca_write64(first_ind << srq->wqe_shift, srq->srqn << 8,
572				      dev->kar + MTHCA_RECEIVE_DOORBELL,
573				      MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
574
575			first_ind = srq->first_free;
576		}
577	}
578
579	if (likely(nreq)) {
580		/*
581		 * Make sure that descriptors are written before
582		 * doorbell is rung.
583		 */
584		wmb();
585
586		mthca_write64(first_ind << srq->wqe_shift, (srq->srqn << 8) | nreq,
587			      dev->kar + MTHCA_RECEIVE_DOORBELL,
588			      MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
589	}
590
591	/*
592	 * Make sure doorbells don't leak out of SRQ spinlock and
593	 * reach the HCA out of order:
594	 */
595	mmiowb();
596
597	spin_unlock_irqrestore(&srq->lock, flags);
598	return err;
599}
600
601int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
602			      struct ib_recv_wr **bad_wr)
603{
604	struct mthca_dev *dev = to_mdev(ibsrq->device);
605	struct mthca_srq *srq = to_msrq(ibsrq);
606	unsigned long flags;
607	int err = 0;
608	int ind;
609	int next_ind;
610	int nreq;
611	int i;
612	void *wqe;
613
614	spin_lock_irqsave(&srq->lock, flags);
615
616	for (nreq = 0; wr; ++nreq, wr = wr->next) {
617		ind = srq->first_free;
618
619		if (unlikely(ind < 0)) {
620			mthca_err(dev, "SRQ %06x full\n", srq->srqn);
621			err = -ENOMEM;
622			*bad_wr = wr;
623			break;
624		}
625
626		wqe       = get_wqe(srq, ind);
627		next_ind  = *wqe_to_link(wqe);
628
629		if (unlikely(next_ind < 0)) {
630			mthca_err(dev, "SRQ %06x full\n", srq->srqn);
631			err = -ENOMEM;
632			*bad_wr = wr;
633			break;
634		}
635
636		((struct mthca_next_seg *) wqe)->nda_op =
637			cpu_to_be32((next_ind << srq->wqe_shift) | 1);
638		((struct mthca_next_seg *) wqe)->ee_nds = 0;
639		/* flags field will always remain 0 */
640
641		wqe += sizeof (struct mthca_next_seg);
642
643		if (unlikely(wr->num_sge > srq->max_gs)) {
644			err = -EINVAL;
645			*bad_wr = wr;
646			break;
647		}
648
649		for (i = 0; i < wr->num_sge; ++i) {
650			mthca_set_data_seg(wqe, wr->sg_list + i);
651			wqe += sizeof (struct mthca_data_seg);
652		}
653
654		if (i < srq->max_gs)
655			mthca_set_data_seg_inval(wqe);
656
657		srq->wrid[ind]  = wr->wr_id;
658		srq->first_free = next_ind;
659	}
660
661	if (likely(nreq)) {
662		srq->counter += nreq;
663
664		/*
665		 * Make sure that descriptors are written before
666		 * we write doorbell record.
667		 */
668		wmb();
669		*srq->db = cpu_to_be32(srq->counter);
670	}
671
672	spin_unlock_irqrestore(&srq->lock, flags);
673	return err;
674}
675
676int mthca_max_srq_sge(struct mthca_dev *dev)
677{
678	if (mthca_is_memfree(dev))
679		return dev->limits.max_sg;
680
681	/*
682	 * SRQ allocations are based on powers of 2 for Tavor,
683	 * (although they only need to be multiples of 16 bytes).
684	 *
685	 * Therefore, we need to base the max number of sg entries on
686	 * the largest power of 2 descriptor size that is <= to the
687	 * actual max WQE descriptor size, rather than return the
688	 * max_sg value given by the firmware (which is based on WQE
689	 * sizes as multiples of 16, not powers of 2).
690	 *
691	 * If SRQ implementation is changed for Tavor to be based on
692	 * multiples of 16, the calculation below can be deleted and
693	 * the FW max_sg value returned.
694	 */
695	return min_t(int, dev->limits.max_sg,
696		     ((1 << (fls(dev->limits.max_desc_sz) - 1)) -
697		      sizeof (struct mthca_next_seg)) /
698		     sizeof (struct mthca_data_seg));
699}
700
701int mthca_init_srq_table(struct mthca_dev *dev)
702{
703	int err;
704
705	if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
706		return 0;
707
708	spin_lock_init(&dev->srq_table.lock);
709
710	err = mthca_alloc_init(&dev->srq_table.alloc,
711			       dev->limits.num_srqs,
712			       dev->limits.num_srqs - 1,
713			       dev->limits.reserved_srqs);
714	if (err)
715		return err;
716
717	err = mthca_array_init(&dev->srq_table.srq,
718			       dev->limits.num_srqs);
719	if (err)
720		mthca_alloc_cleanup(&dev->srq_table.alloc);
721
722	return err;
723}
724
725void mthca_cleanup_srq_table(struct mthca_dev *dev)
726{
727	if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
728		return;
729
730	mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs);
731	mthca_alloc_cleanup(&dev->srq_table.alloc);
732}
733