2 * Copyright (c) 2016 HGST, a Western Digital Company.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 #include <linux/moduleparam.h>
14 #include <linux/slab.h>
15 #include <rdma/mr_pool.h>
25 static bool rdma_rw_force_mr;
26 module_param_named(force_mr, rdma_rw_force_mr, bool, 0);
27 MODULE_PARM_DESC(force_mr, "Force usage of MRs for RDMA READ/WRITE operations");
30 * Check if the device might use memory registration. This is currently only
31 * true for iWarp devices. In the future we can hopefully fine tune this based
32 * on HCA driver input.
34 static inline bool rdma_rw_can_use_mr(struct ib_device *dev, u8 port_num)
36 if (rdma_protocol_iwarp(dev, port_num))
38 if (unlikely(rdma_rw_force_mr))
44 * Check if the device will use memory registration for this RW operation.
45 * We currently always use memory registrations for iWarp RDMA READs, and
46 * have a debug option to force usage of MRs.
48 * XXX: In the future we can hopefully fine tune this based on HCA driver
51 static inline bool rdma_rw_io_needs_mr(struct ib_device *dev, u8 port_num,
52 enum dma_data_direction dir, int dma_nents)
54 if (rdma_protocol_iwarp(dev, port_num) && dir == DMA_FROM_DEVICE)
56 if (unlikely(rdma_rw_force_mr))
61 static inline u32 rdma_rw_max_sge(struct ib_device *dev,
62 enum dma_data_direction dir)
64 return dir == DMA_TO_DEVICE ?
65 dev->attrs.max_sge : dev->attrs.max_sge_rd;
68 static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev)
70 /* arbitrary limit to avoid allocating gigantic resources */
71 return min_t(u32, dev->attrs.max_fast_reg_page_list_len, 256);
74 static int rdma_rw_init_one_mr(struct ib_qp *qp, u8 port_num,
75 struct rdma_rw_reg_ctx *reg, struct scatterlist *sg,
76 u32 sg_cnt, u32 offset)
78 u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device);
79 u32 nents = min(sg_cnt, pages_per_mr);
82 reg->mr = ib_mr_pool_get(qp, &qp->rdma_mrs);
86 if (reg->mr->need_inval) {
87 reg->inv_wr.opcode = IB_WR_LOCAL_INV;
88 reg->inv_wr.ex.invalidate_rkey = reg->mr->lkey;
89 reg->inv_wr.next = ®->reg_wr.wr;
92 reg->inv_wr.next = NULL;
95 ret = ib_map_mr_sg(reg->mr, sg, nents, offset, PAGE_SIZE);
97 ib_mr_pool_put(qp, &qp->rdma_mrs, reg->mr);
101 reg->reg_wr.wr.opcode = IB_WR_REG_MR;
102 reg->reg_wr.mr = reg->mr;
103 reg->reg_wr.access = IB_ACCESS_LOCAL_WRITE;
104 if (rdma_protocol_iwarp(qp->device, port_num))
105 reg->reg_wr.access |= IB_ACCESS_REMOTE_WRITE;
108 reg->sge.addr = reg->mr->iova;
109 reg->sge.length = reg->mr->length;
113 static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
114 u8 port_num, struct scatterlist *sg, u32 sg_cnt, u32 offset,
115 u64 remote_addr, u32 rkey, enum dma_data_direction dir)
117 u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device);
118 int i, j, ret = 0, count = 0;
120 ctx->nr_ops = (sg_cnt + pages_per_mr - 1) / pages_per_mr;
121 ctx->reg = kcalloc(ctx->nr_ops, sizeof(*ctx->reg), GFP_KERNEL);
127 for (i = 0; i < ctx->nr_ops; i++) {
128 struct rdma_rw_reg_ctx *prev = i ? &ctx->reg[i - 1] : NULL;
129 struct rdma_rw_reg_ctx *reg = &ctx->reg[i];
130 u32 nents = min(sg_cnt, pages_per_mr);
132 ret = rdma_rw_init_one_mr(qp, port_num, reg, sg, sg_cnt,
139 if (reg->mr->need_inval)
140 prev->wr.wr.next = ®->inv_wr;
142 prev->wr.wr.next = ®->reg_wr.wr;
145 reg->reg_wr.wr.next = ®->wr.wr;
147 reg->wr.wr.sg_list = ®->sge;
148 reg->wr.wr.num_sge = 1;
149 reg->wr.remote_addr = remote_addr;
151 if (dir == DMA_TO_DEVICE) {
152 reg->wr.wr.opcode = IB_WR_RDMA_WRITE;
153 } else if (!rdma_cap_read_inv(qp->device, port_num)) {
154 reg->wr.wr.opcode = IB_WR_RDMA_READ;
156 reg->wr.wr.opcode = IB_WR_RDMA_READ_WITH_INV;
157 reg->wr.wr.ex.invalidate_rkey = reg->mr->lkey;
161 remote_addr += reg->sge.length;
163 for (j = 0; j < nents; j++)
168 ctx->type = RDMA_RW_MR;
173 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->reg[i].mr);
179 static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
180 struct scatterlist *sg, u32 sg_cnt, u32 offset,
181 u64 remote_addr, u32 rkey, enum dma_data_direction dir)
183 struct ib_device *dev = qp->pd->device;
184 u32 max_sge = rdma_rw_max_sge(dev, dir);
186 u32 total_len = 0, i, j;
188 ctx->nr_ops = DIV_ROUND_UP(sg_cnt, max_sge);
190 ctx->map.sges = sge = kcalloc(sg_cnt, sizeof(*sge), GFP_KERNEL);
194 ctx->map.wrs = kcalloc(ctx->nr_ops, sizeof(*ctx->map.wrs), GFP_KERNEL);
198 for (i = 0; i < ctx->nr_ops; i++) {
199 struct ib_rdma_wr *rdma_wr = &ctx->map.wrs[i];
200 u32 nr_sge = min(sg_cnt, max_sge);
202 if (dir == DMA_TO_DEVICE)
203 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
205 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
206 rdma_wr->remote_addr = remote_addr + total_len;
207 rdma_wr->rkey = rkey;
208 rdma_wr->wr.sg_list = sge;
210 for (j = 0; j < nr_sge; j++, sg = sg_next(sg)) {
211 rdma_wr->wr.num_sge++;
213 sge->addr = ib_sg_dma_address(dev, sg) + offset;
214 sge->length = ib_sg_dma_len(dev, sg) - offset;
215 sge->lkey = qp->pd->local_dma_lkey;
217 total_len += sge->length;
223 if (i + 1 < ctx->nr_ops)
224 rdma_wr->wr.next = &ctx->map.wrs[i + 1].wr;
227 ctx->type = RDMA_RW_MULTI_WR;
231 kfree(ctx->map.sges);
236 static int rdma_rw_init_single_wr(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
237 struct scatterlist *sg, u32 offset, u64 remote_addr, u32 rkey,
238 enum dma_data_direction dir)
240 struct ib_device *dev = qp->pd->device;
241 struct ib_rdma_wr *rdma_wr = &ctx->single.wr;
245 ctx->single.sge.lkey = qp->pd->local_dma_lkey;
246 ctx->single.sge.addr = ib_sg_dma_address(dev, sg) + offset;
247 ctx->single.sge.length = ib_sg_dma_len(dev, sg) - offset;
249 memset(rdma_wr, 0, sizeof(*rdma_wr));
250 if (dir == DMA_TO_DEVICE)
251 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
253 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
254 rdma_wr->wr.sg_list = &ctx->single.sge;
255 rdma_wr->wr.num_sge = 1;
256 rdma_wr->remote_addr = remote_addr;
257 rdma_wr->rkey = rkey;
259 ctx->type = RDMA_RW_SINGLE_WR;
264 * rdma_rw_ctx_init - initialize a RDMA READ/WRITE context
265 * @ctx: context to initialize
266 * @qp: queue pair to operate on
267 * @port_num: port num to which the connection is bound
268 * @sg: scatterlist to READ/WRITE from/to
269 * @sg_cnt: number of entries in @sg
270 * @sg_offset: current byte offset into @sg
271 * @remote_addr:remote address to read/write (relative to @rkey)
272 * @rkey: remote key to operate on
273 * @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ
275 * Returns the number of WQEs that will be needed on the workqueue if
276 * successful, or a negative error code.
278 int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
279 struct scatterlist *sg, u32 sg_cnt, u32 sg_offset,
280 u64 remote_addr, u32 rkey, enum dma_data_direction dir)
282 struct ib_device *dev = qp->pd->device;
285 ret = ib_dma_map_sg(dev, sg, sg_cnt, dir);
291 * Skip to the S/G entry that sg_offset falls into:
294 u32 len = ib_sg_dma_len(dev, sg);
305 if (WARN_ON_ONCE(sg_cnt == 0))
308 if (rdma_rw_io_needs_mr(qp->device, port_num, dir, sg_cnt)) {
309 ret = rdma_rw_init_mr_wrs(ctx, qp, port_num, sg, sg_cnt,
310 sg_offset, remote_addr, rkey, dir);
311 } else if (sg_cnt > 1) {
312 ret = rdma_rw_init_map_wrs(ctx, qp, sg, sg_cnt, sg_offset,
313 remote_addr, rkey, dir);
315 ret = rdma_rw_init_single_wr(ctx, qp, sg, sg_offset,
316 remote_addr, rkey, dir);
324 ib_dma_unmap_sg(dev, sg, sg_cnt, dir);
327 EXPORT_SYMBOL(rdma_rw_ctx_init);
330 * rdma_rw_ctx_signature init - initialize a RW context with signature offload
331 * @ctx: context to initialize
332 * @qp: queue pair to operate on
333 * @port_num: port num to which the connection is bound
334 * @sg: scatterlist to READ/WRITE from/to
335 * @sg_cnt: number of entries in @sg
336 * @prot_sg: scatterlist to READ/WRITE protection information from/to
337 * @prot_sg_cnt: number of entries in @prot_sg
338 * @sig_attrs: signature offloading algorithms
339 * @remote_addr:remote address to read/write (relative to @rkey)
340 * @rkey: remote key to operate on
341 * @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ
343 * Returns the number of WQEs that will be needed on the workqueue if
344 * successful, or a negative error code.
346 int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
347 u8 port_num, struct scatterlist *sg, u32 sg_cnt,
348 struct scatterlist *prot_sg, u32 prot_sg_cnt,
349 struct ib_sig_attrs *sig_attrs,
350 u64 remote_addr, u32 rkey, enum dma_data_direction dir)
352 struct ib_device *dev = qp->pd->device;
353 u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device);
354 struct ib_rdma_wr *rdma_wr;
355 struct ib_send_wr *prev_wr = NULL;
358 if (sg_cnt > pages_per_mr || prot_sg_cnt > pages_per_mr) {
359 pr_err("SG count too large\n");
363 ret = ib_dma_map_sg(dev, sg, sg_cnt, dir);
368 ret = ib_dma_map_sg(dev, prot_sg, prot_sg_cnt, dir);
375 ctx->type = RDMA_RW_SIG_MR;
377 ctx->sig = kcalloc(1, sizeof(*ctx->sig), GFP_KERNEL);
380 goto out_unmap_prot_sg;
383 ret = rdma_rw_init_one_mr(qp, port_num, &ctx->sig->data, sg, sg_cnt, 0);
387 prev_wr = &ctx->sig->data.reg_wr.wr;
390 ret = rdma_rw_init_one_mr(qp, port_num, &ctx->sig->prot,
391 prot_sg, prot_sg_cnt, 0);
393 goto out_destroy_data_mr;
396 if (ctx->sig->prot.inv_wr.next)
397 prev_wr->next = &ctx->sig->prot.inv_wr;
399 prev_wr->next = &ctx->sig->prot.reg_wr.wr;
400 prev_wr = &ctx->sig->prot.reg_wr.wr;
402 ctx->sig->prot.mr = NULL;
405 ctx->sig->sig_mr = ib_mr_pool_get(qp, &qp->sig_mrs);
406 if (!ctx->sig->sig_mr) {
408 goto out_destroy_prot_mr;
411 if (ctx->sig->sig_mr->need_inval) {
412 memset(&ctx->sig->sig_inv_wr, 0, sizeof(ctx->sig->sig_inv_wr));
414 ctx->sig->sig_inv_wr.opcode = IB_WR_LOCAL_INV;
415 ctx->sig->sig_inv_wr.ex.invalidate_rkey = ctx->sig->sig_mr->rkey;
417 prev_wr->next = &ctx->sig->sig_inv_wr;
418 prev_wr = &ctx->sig->sig_inv_wr;
421 ctx->sig->sig_wr.wr.opcode = IB_WR_REG_SIG_MR;
422 ctx->sig->sig_wr.wr.wr_cqe = NULL;
423 ctx->sig->sig_wr.wr.sg_list = &ctx->sig->data.sge;
424 ctx->sig->sig_wr.wr.num_sge = 1;
425 ctx->sig->sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE;
426 ctx->sig->sig_wr.sig_attrs = sig_attrs;
427 ctx->sig->sig_wr.sig_mr = ctx->sig->sig_mr;
429 ctx->sig->sig_wr.prot = &ctx->sig->prot.sge;
430 prev_wr->next = &ctx->sig->sig_wr.wr;
431 prev_wr = &ctx->sig->sig_wr.wr;
434 ctx->sig->sig_sge.addr = 0;
435 ctx->sig->sig_sge.length = ctx->sig->data.sge.length;
436 if (sig_attrs->wire.sig_type != IB_SIG_TYPE_NONE)
437 ctx->sig->sig_sge.length += ctx->sig->prot.sge.length;
439 rdma_wr = &ctx->sig->data.wr;
440 rdma_wr->wr.sg_list = &ctx->sig->sig_sge;
441 rdma_wr->wr.num_sge = 1;
442 rdma_wr->remote_addr = remote_addr;
443 rdma_wr->rkey = rkey;
444 if (dir == DMA_TO_DEVICE)
445 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
447 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
448 prev_wr->next = &rdma_wr->wr;
449 prev_wr = &rdma_wr->wr;
456 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->prot.mr);
458 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->data.mr);
462 ib_dma_unmap_sg(dev, prot_sg, prot_sg_cnt, dir);
464 ib_dma_unmap_sg(dev, sg, sg_cnt, dir);
467 EXPORT_SYMBOL(rdma_rw_ctx_signature_init);
470 * Now that we are going to post the WRs we can update the lkey and need_inval
471 * state on the MRs. If we were doing this at init time, we would get double
472 * or missing invalidations if a context was initialized but not actually
475 static void rdma_rw_update_lkey(struct rdma_rw_reg_ctx *reg, bool need_inval)
477 reg->mr->need_inval = need_inval;
478 ib_update_fast_reg_key(reg->mr, ib_inc_rkey(reg->mr->lkey));
479 reg->reg_wr.key = reg->mr->lkey;
480 reg->sge.lkey = reg->mr->lkey;
484 * rdma_rw_ctx_wrs - return chain of WRs for a RDMA READ or WRITE operation
485 * @ctx: context to operate on
486 * @qp: queue pair to operate on
487 * @port_num: port num to which the connection is bound
488 * @cqe: completion queue entry for the last WR
489 * @chain_wr: WR to append to the posted chain
491 * Return the WR chain for the set of RDMA READ/WRITE operations described by
492 * @ctx, as well as any memory registration operations needed. If @chain_wr
493 * is non-NULL the WR it points to will be appended to the chain of WRs posted.
494 * If @chain_wr is not set @cqe must be set so that the caller gets a
495 * completion notification.
497 struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
498 u8 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
500 struct ib_send_wr *first_wr, *last_wr;
505 rdma_rw_update_lkey(&ctx->sig->data, true);
506 if (ctx->sig->prot.mr)
507 rdma_rw_update_lkey(&ctx->sig->prot, true);
509 ctx->sig->sig_mr->need_inval = true;
510 ib_update_fast_reg_key(ctx->sig->sig_mr,
511 ib_inc_rkey(ctx->sig->sig_mr->lkey));
512 ctx->sig->sig_sge.lkey = ctx->sig->sig_mr->lkey;
514 if (ctx->sig->data.inv_wr.next)
515 first_wr = &ctx->sig->data.inv_wr;
517 first_wr = &ctx->sig->data.reg_wr.wr;
518 last_wr = &ctx->sig->data.wr.wr;
521 for (i = 0; i < ctx->nr_ops; i++) {
522 rdma_rw_update_lkey(&ctx->reg[i],
523 ctx->reg[i].wr.wr.opcode !=
524 IB_WR_RDMA_READ_WITH_INV);
527 if (ctx->reg[0].inv_wr.next)
528 first_wr = &ctx->reg[0].inv_wr;
530 first_wr = &ctx->reg[0].reg_wr.wr;
531 last_wr = &ctx->reg[ctx->nr_ops - 1].wr.wr;
533 case RDMA_RW_MULTI_WR:
534 first_wr = &ctx->map.wrs[0].wr;
535 last_wr = &ctx->map.wrs[ctx->nr_ops - 1].wr;
537 case RDMA_RW_SINGLE_WR:
538 first_wr = &ctx->single.wr.wr;
539 last_wr = &ctx->single.wr.wr;
546 last_wr->next = chain_wr;
548 last_wr->wr_cqe = cqe;
549 last_wr->send_flags |= IB_SEND_SIGNALED;
554 EXPORT_SYMBOL(rdma_rw_ctx_wrs);
557 * rdma_rw_ctx_post - post a RDMA READ or RDMA WRITE operation
558 * @ctx: context to operate on
559 * @qp: queue pair to operate on
560 * @port_num: port num to which the connection is bound
561 * @cqe: completion queue entry for the last WR
562 * @chain_wr: WR to append to the posted chain
564 * Post the set of RDMA READ/WRITE operations described by @ctx, as well as
565 * any memory registration operations needed. If @chain_wr is non-NULL the
566 * WR it points to will be appended to the chain of WRs posted. If @chain_wr
567 * is not set @cqe must be set so that the caller gets a completion
570 int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
571 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
573 struct ib_send_wr *first_wr, *bad_wr;
575 first_wr = rdma_rw_ctx_wrs(ctx, qp, port_num, cqe, chain_wr);
576 return ib_post_send(qp, first_wr, &bad_wr);
578 EXPORT_SYMBOL(rdma_rw_ctx_post);
581 * rdma_rw_ctx_destroy - release all resources allocated by rdma_rw_ctx_init
582 * @ctx: context to release
583 * @qp: queue pair to operate on
584 * @port_num: port num to which the connection is bound
585 * @sg: scatterlist that was used for the READ/WRITE
586 * @sg_cnt: number of entries in @sg
587 * @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ
589 void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
590 struct scatterlist *sg, u32 sg_cnt, enum dma_data_direction dir)
596 for (i = 0; i < ctx->nr_ops; i++)
597 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->reg[i].mr);
600 case RDMA_RW_MULTI_WR:
602 kfree(ctx->map.sges);
604 case RDMA_RW_SINGLE_WR:
611 ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
613 EXPORT_SYMBOL(rdma_rw_ctx_destroy);
616 * rdma_rw_ctx_destroy_signature - release all resources allocated by
617 * rdma_rw_ctx_init_signature
618 * @ctx: context to release
619 * @qp: queue pair to operate on
620 * @port_num: port num to which the connection is bound
621 * @sg: scatterlist that was used for the READ/WRITE
622 * @sg_cnt: number of entries in @sg
623 * @prot_sg: scatterlist that was used for the READ/WRITE of the PI
624 * @prot_sg_cnt: number of entries in @prot_sg
625 * @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ
627 void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
628 u8 port_num, struct scatterlist *sg, u32 sg_cnt,
629 struct scatterlist *prot_sg, u32 prot_sg_cnt,
630 enum dma_data_direction dir)
632 if (WARN_ON_ONCE(ctx->type != RDMA_RW_SIG_MR))
635 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->data.mr);
636 ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
638 if (ctx->sig->prot.mr) {
639 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->prot.mr);
640 ib_dma_unmap_sg(qp->pd->device, prot_sg, prot_sg_cnt, dir);
643 ib_mr_pool_put(qp, &qp->sig_mrs, ctx->sig->sig_mr);
646 EXPORT_SYMBOL(rdma_rw_ctx_destroy_signature);
648 void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr)
652 WARN_ON_ONCE(attr->port_num == 0);
655 * Each context needs at least one RDMA READ or WRITE WR.
657 * For some hardware we might need more, eventually we should ask the
658 * HCA driver for a multiplier here.
663 * If the devices needs MRs to perform RDMA READ or WRITE operations,
664 * we'll need two additional MRs for the registrations and the
667 if (attr->create_flags & IB_QP_CREATE_SIGNATURE_EN)
668 factor += 6; /* (inv + reg) * (data + prot + sig) */
669 else if (rdma_rw_can_use_mr(dev, attr->port_num))
670 factor += 2; /* inv + reg */
672 attr->cap.max_send_wr += factor * attr->cap.max_rdma_ctxs;
675 * But maybe we were just too high in the sky and the device doesn't
676 * even support all we need, and we'll have to live with what we get..
678 attr->cap.max_send_wr =
679 min_t(u32, attr->cap.max_send_wr, dev->attrs.max_qp_wr);
682 int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr)
684 struct ib_device *dev = qp->pd->device;
685 u32 nr_mrs = 0, nr_sig_mrs = 0;
688 if (attr->create_flags & IB_QP_CREATE_SIGNATURE_EN) {
689 nr_sig_mrs = attr->cap.max_rdma_ctxs;
690 nr_mrs = attr->cap.max_rdma_ctxs * 2;
691 } else if (rdma_rw_can_use_mr(dev, attr->port_num)) {
692 nr_mrs = attr->cap.max_rdma_ctxs;
696 ret = ib_mr_pool_init(qp, &qp->rdma_mrs, nr_mrs,
698 rdma_rw_fr_page_list_len(dev));
700 pr_err("%s: failed to allocated %d MRs\n",
707 ret = ib_mr_pool_init(qp, &qp->sig_mrs, nr_sig_mrs,
708 IB_MR_TYPE_SIGNATURE, 2);
710 pr_err("%s: failed to allocated %d SIG MRs\n",
712 goto out_free_rdma_mrs;
719 ib_mr_pool_destroy(qp, &qp->rdma_mrs);
723 void rdma_rw_cleanup_mrs(struct ib_qp *qp)
725 ib_mr_pool_destroy(qp, &qp->sig_mrs);
726 ib_mr_pool_destroy(qp, &qp->rdma_mrs);