1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2016 HGST, a Western Digital Company.
5 #include <linux/moduleparam.h>
6 #include <linux/slab.h>
7 #include <linux/pci-p2pdma.h>
8 #include <rdma/mr_pool.h>
18 static bool rdma_rw_force_mr;
19 module_param_named(force_mr, rdma_rw_force_mr, bool, 0);
20 MODULE_PARM_DESC(force_mr, "Force usage of MRs for RDMA READ/WRITE operations");
23 * Check if the device might use memory registration. This is currently only
24 * true for iWarp devices. In the future we can hopefully fine tune this based
25 * on HCA driver input.
27 static inline bool rdma_rw_can_use_mr(struct ib_device *dev, u8 port_num)
29 if (rdma_protocol_iwarp(dev, port_num))
31 if (unlikely(rdma_rw_force_mr))
37 * Check if the device will use memory registration for this RW operation.
38 * We currently always use memory registrations for iWarp RDMA READs, and
39 * have a debug option to force usage of MRs.
41 * XXX: In the future we can hopefully fine tune this based on HCA driver
44 static inline bool rdma_rw_io_needs_mr(struct ib_device *dev, u8 port_num,
45 enum dma_data_direction dir, int dma_nents)
47 if (rdma_protocol_iwarp(dev, port_num) && dir == DMA_FROM_DEVICE)
49 if (unlikely(rdma_rw_force_mr))
54 static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev)
56 /* arbitrary limit to avoid allocating gigantic resources */
57 return min_t(u32, dev->attrs.max_fast_reg_page_list_len, 256);
60 /* Caller must have zero-initialized *reg. */
61 static int rdma_rw_init_one_mr(struct ib_qp *qp, u8 port_num,
62 struct rdma_rw_reg_ctx *reg, struct scatterlist *sg,
63 u32 sg_cnt, u32 offset)
65 u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device);
66 u32 nents = min(sg_cnt, pages_per_mr);
69 reg->mr = ib_mr_pool_get(qp, &qp->rdma_mrs);
73 if (reg->mr->need_inval) {
74 reg->inv_wr.opcode = IB_WR_LOCAL_INV;
75 reg->inv_wr.ex.invalidate_rkey = reg->mr->lkey;
76 reg->inv_wr.next = ®->reg_wr.wr;
79 reg->inv_wr.next = NULL;
82 ret = ib_map_mr_sg(reg->mr, sg, nents, &offset, PAGE_SIZE);
83 if (ret < 0 || ret < nents) {
84 ib_mr_pool_put(qp, &qp->rdma_mrs, reg->mr);
88 reg->reg_wr.wr.opcode = IB_WR_REG_MR;
89 reg->reg_wr.mr = reg->mr;
90 reg->reg_wr.access = IB_ACCESS_LOCAL_WRITE;
91 if (rdma_protocol_iwarp(qp->device, port_num))
92 reg->reg_wr.access |= IB_ACCESS_REMOTE_WRITE;
95 reg->sge.addr = reg->mr->iova;
96 reg->sge.length = reg->mr->length;
100 static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
101 u8 port_num, struct scatterlist *sg, u32 sg_cnt, u32 offset,
102 u64 remote_addr, u32 rkey, enum dma_data_direction dir)
104 struct rdma_rw_reg_ctx *prev = NULL;
105 u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device);
106 int i, j, ret = 0, count = 0;
108 ctx->nr_ops = (sg_cnt + pages_per_mr - 1) / pages_per_mr;
109 ctx->reg = kcalloc(ctx->nr_ops, sizeof(*ctx->reg), GFP_KERNEL);
115 for (i = 0; i < ctx->nr_ops; i++) {
116 struct rdma_rw_reg_ctx *reg = &ctx->reg[i];
117 u32 nents = min(sg_cnt, pages_per_mr);
119 ret = rdma_rw_init_one_mr(qp, port_num, reg, sg, sg_cnt,
126 if (reg->mr->need_inval)
127 prev->wr.wr.next = ®->inv_wr;
129 prev->wr.wr.next = ®->reg_wr.wr;
132 reg->reg_wr.wr.next = ®->wr.wr;
134 reg->wr.wr.sg_list = ®->sge;
135 reg->wr.wr.num_sge = 1;
136 reg->wr.remote_addr = remote_addr;
138 if (dir == DMA_TO_DEVICE) {
139 reg->wr.wr.opcode = IB_WR_RDMA_WRITE;
140 } else if (!rdma_cap_read_inv(qp->device, port_num)) {
141 reg->wr.wr.opcode = IB_WR_RDMA_READ;
143 reg->wr.wr.opcode = IB_WR_RDMA_READ_WITH_INV;
144 reg->wr.wr.ex.invalidate_rkey = reg->mr->lkey;
148 remote_addr += reg->sge.length;
150 for (j = 0; j < nents; j++)
157 prev->wr.wr.next = NULL;
159 ctx->type = RDMA_RW_MR;
164 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->reg[i].mr);
170 static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
171 struct scatterlist *sg, u32 sg_cnt, u32 offset,
172 u64 remote_addr, u32 rkey, enum dma_data_direction dir)
174 u32 max_sge = dir == DMA_TO_DEVICE ? qp->max_write_sge :
177 u32 total_len = 0, i, j;
179 ctx->nr_ops = DIV_ROUND_UP(sg_cnt, max_sge);
181 ctx->map.sges = sge = kcalloc(sg_cnt, sizeof(*sge), GFP_KERNEL);
185 ctx->map.wrs = kcalloc(ctx->nr_ops, sizeof(*ctx->map.wrs), GFP_KERNEL);
189 for (i = 0; i < ctx->nr_ops; i++) {
190 struct ib_rdma_wr *rdma_wr = &ctx->map.wrs[i];
191 u32 nr_sge = min(sg_cnt, max_sge);
193 if (dir == DMA_TO_DEVICE)
194 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
196 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
197 rdma_wr->remote_addr = remote_addr + total_len;
198 rdma_wr->rkey = rkey;
199 rdma_wr->wr.num_sge = nr_sge;
200 rdma_wr->wr.sg_list = sge;
202 for (j = 0; j < nr_sge; j++, sg = sg_next(sg)) {
203 sge->addr = sg_dma_address(sg) + offset;
204 sge->length = sg_dma_len(sg) - offset;
205 sge->lkey = qp->pd->local_dma_lkey;
207 total_len += sge->length;
213 rdma_wr->wr.next = i + 1 < ctx->nr_ops ?
214 &ctx->map.wrs[i + 1].wr : NULL;
217 ctx->type = RDMA_RW_MULTI_WR;
221 kfree(ctx->map.sges);
226 static int rdma_rw_init_single_wr(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
227 struct scatterlist *sg, u32 offset, u64 remote_addr, u32 rkey,
228 enum dma_data_direction dir)
230 struct ib_rdma_wr *rdma_wr = &ctx->single.wr;
234 ctx->single.sge.lkey = qp->pd->local_dma_lkey;
235 ctx->single.sge.addr = sg_dma_address(sg) + offset;
236 ctx->single.sge.length = sg_dma_len(sg) - offset;
238 memset(rdma_wr, 0, sizeof(*rdma_wr));
239 if (dir == DMA_TO_DEVICE)
240 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
242 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
243 rdma_wr->wr.sg_list = &ctx->single.sge;
244 rdma_wr->wr.num_sge = 1;
245 rdma_wr->remote_addr = remote_addr;
246 rdma_wr->rkey = rkey;
248 ctx->type = RDMA_RW_SINGLE_WR;
253 * rdma_rw_ctx_init - initialize a RDMA READ/WRITE context
254 * @ctx: context to initialize
255 * @qp: queue pair to operate on
256 * @port_num: port num to which the connection is bound
257 * @sg: scatterlist to READ/WRITE from/to
258 * @sg_cnt: number of entries in @sg
259 * @sg_offset: current byte offset into @sg
260 * @remote_addr:remote address to read/write (relative to @rkey)
261 * @rkey: remote key to operate on
262 * @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ
264 * Returns the number of WQEs that will be needed on the workqueue if
265 * successful, or a negative error code.
267 int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
268 struct scatterlist *sg, u32 sg_cnt, u32 sg_offset,
269 u64 remote_addr, u32 rkey, enum dma_data_direction dir)
271 struct ib_device *dev = qp->pd->device;
274 if (is_pci_p2pdma_page(sg_page(sg)))
275 ret = pci_p2pdma_map_sg(dev->dma_device, sg, sg_cnt, dir);
277 ret = ib_dma_map_sg(dev, sg, sg_cnt, dir);
284 * Skip to the S/G entry that sg_offset falls into:
287 u32 len = sg_dma_len(sg);
298 if (WARN_ON_ONCE(sg_cnt == 0))
301 if (rdma_rw_io_needs_mr(qp->device, port_num, dir, sg_cnt)) {
302 ret = rdma_rw_init_mr_wrs(ctx, qp, port_num, sg, sg_cnt,
303 sg_offset, remote_addr, rkey, dir);
304 } else if (sg_cnt > 1) {
305 ret = rdma_rw_init_map_wrs(ctx, qp, sg, sg_cnt, sg_offset,
306 remote_addr, rkey, dir);
308 ret = rdma_rw_init_single_wr(ctx, qp, sg, sg_offset,
309 remote_addr, rkey, dir);
317 ib_dma_unmap_sg(dev, sg, sg_cnt, dir);
320 EXPORT_SYMBOL(rdma_rw_ctx_init);
323 * rdma_rw_ctx_signature_init - initialize a RW context with signature offload
324 * @ctx: context to initialize
325 * @qp: queue pair to operate on
326 * @port_num: port num to which the connection is bound
327 * @sg: scatterlist to READ/WRITE from/to
328 * @sg_cnt: number of entries in @sg
329 * @prot_sg: scatterlist to READ/WRITE protection information from/to
330 * @prot_sg_cnt: number of entries in @prot_sg
331 * @sig_attrs: signature offloading algorithms
332 * @remote_addr:remote address to read/write (relative to @rkey)
333 * @rkey: remote key to operate on
334 * @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ
336 * Returns the number of WQEs that will be needed on the workqueue if
337 * successful, or a negative error code.
339 int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
340 u8 port_num, struct scatterlist *sg, u32 sg_cnt,
341 struct scatterlist *prot_sg, u32 prot_sg_cnt,
342 struct ib_sig_attrs *sig_attrs,
343 u64 remote_addr, u32 rkey, enum dma_data_direction dir)
345 struct ib_device *dev = qp->pd->device;
346 u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device);
347 struct ib_rdma_wr *rdma_wr;
348 struct ib_send_wr *prev_wr = NULL;
351 if (sg_cnt > pages_per_mr || prot_sg_cnt > pages_per_mr) {
352 pr_err("SG count too large\n");
356 ret = ib_dma_map_sg(dev, sg, sg_cnt, dir);
361 ret = ib_dma_map_sg(dev, prot_sg, prot_sg_cnt, dir);
368 ctx->type = RDMA_RW_SIG_MR;
370 ctx->sig = kcalloc(1, sizeof(*ctx->sig), GFP_KERNEL);
373 goto out_unmap_prot_sg;
376 ret = rdma_rw_init_one_mr(qp, port_num, &ctx->sig->data, sg, sg_cnt, 0);
380 prev_wr = &ctx->sig->data.reg_wr.wr;
382 ret = rdma_rw_init_one_mr(qp, port_num, &ctx->sig->prot,
383 prot_sg, prot_sg_cnt, 0);
385 goto out_destroy_data_mr;
388 if (ctx->sig->prot.inv_wr.next)
389 prev_wr->next = &ctx->sig->prot.inv_wr;
391 prev_wr->next = &ctx->sig->prot.reg_wr.wr;
392 prev_wr = &ctx->sig->prot.reg_wr.wr;
394 ctx->sig->sig_mr = ib_mr_pool_get(qp, &qp->sig_mrs);
395 if (!ctx->sig->sig_mr) {
397 goto out_destroy_prot_mr;
400 if (ctx->sig->sig_mr->need_inval) {
401 memset(&ctx->sig->sig_inv_wr, 0, sizeof(ctx->sig->sig_inv_wr));
403 ctx->sig->sig_inv_wr.opcode = IB_WR_LOCAL_INV;
404 ctx->sig->sig_inv_wr.ex.invalidate_rkey = ctx->sig->sig_mr->rkey;
406 prev_wr->next = &ctx->sig->sig_inv_wr;
407 prev_wr = &ctx->sig->sig_inv_wr;
410 ctx->sig->sig_wr.wr.opcode = IB_WR_REG_SIG_MR;
411 ctx->sig->sig_wr.wr.wr_cqe = NULL;
412 ctx->sig->sig_wr.wr.sg_list = &ctx->sig->data.sge;
413 ctx->sig->sig_wr.wr.num_sge = 1;
414 ctx->sig->sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE;
415 ctx->sig->sig_wr.sig_attrs = sig_attrs;
416 ctx->sig->sig_wr.sig_mr = ctx->sig->sig_mr;
418 ctx->sig->sig_wr.prot = &ctx->sig->prot.sge;
419 prev_wr->next = &ctx->sig->sig_wr.wr;
420 prev_wr = &ctx->sig->sig_wr.wr;
423 ctx->sig->sig_sge.addr = 0;
424 ctx->sig->sig_sge.length = ctx->sig->data.sge.length;
425 if (sig_attrs->wire.sig_type != IB_SIG_TYPE_NONE)
426 ctx->sig->sig_sge.length += ctx->sig->prot.sge.length;
428 rdma_wr = &ctx->sig->data.wr;
429 rdma_wr->wr.sg_list = &ctx->sig->sig_sge;
430 rdma_wr->wr.num_sge = 1;
431 rdma_wr->remote_addr = remote_addr;
432 rdma_wr->rkey = rkey;
433 if (dir == DMA_TO_DEVICE)
434 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
436 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
437 prev_wr->next = &rdma_wr->wr;
438 prev_wr = &rdma_wr->wr;
445 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->prot.mr);
447 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->data.mr);
451 ib_dma_unmap_sg(dev, prot_sg, prot_sg_cnt, dir);
453 ib_dma_unmap_sg(dev, sg, sg_cnt, dir);
456 EXPORT_SYMBOL(rdma_rw_ctx_signature_init);
459 * Now that we are going to post the WRs we can update the lkey and need_inval
460 * state on the MRs. If we were doing this at init time, we would get double
461 * or missing invalidations if a context was initialized but not actually
464 static void rdma_rw_update_lkey(struct rdma_rw_reg_ctx *reg, bool need_inval)
466 reg->mr->need_inval = need_inval;
467 ib_update_fast_reg_key(reg->mr, ib_inc_rkey(reg->mr->lkey));
468 reg->reg_wr.key = reg->mr->lkey;
469 reg->sge.lkey = reg->mr->lkey;
473 * rdma_rw_ctx_wrs - return chain of WRs for a RDMA READ or WRITE operation
474 * @ctx: context to operate on
475 * @qp: queue pair to operate on
476 * @port_num: port num to which the connection is bound
477 * @cqe: completion queue entry for the last WR
478 * @chain_wr: WR to append to the posted chain
480 * Return the WR chain for the set of RDMA READ/WRITE operations described by
481 * @ctx, as well as any memory registration operations needed. If @chain_wr
482 * is non-NULL the WR it points to will be appended to the chain of WRs posted.
483 * If @chain_wr is not set @cqe must be set so that the caller gets a
484 * completion notification.
486 struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
487 u8 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
489 struct ib_send_wr *first_wr, *last_wr;
494 rdma_rw_update_lkey(&ctx->sig->data, true);
495 if (ctx->sig->prot.mr)
496 rdma_rw_update_lkey(&ctx->sig->prot, true);
498 ctx->sig->sig_mr->need_inval = true;
499 ib_update_fast_reg_key(ctx->sig->sig_mr,
500 ib_inc_rkey(ctx->sig->sig_mr->lkey));
501 ctx->sig->sig_sge.lkey = ctx->sig->sig_mr->lkey;
503 if (ctx->sig->data.inv_wr.next)
504 first_wr = &ctx->sig->data.inv_wr;
506 first_wr = &ctx->sig->data.reg_wr.wr;
507 last_wr = &ctx->sig->data.wr.wr;
510 for (i = 0; i < ctx->nr_ops; i++) {
511 rdma_rw_update_lkey(&ctx->reg[i],
512 ctx->reg[i].wr.wr.opcode !=
513 IB_WR_RDMA_READ_WITH_INV);
516 if (ctx->reg[0].inv_wr.next)
517 first_wr = &ctx->reg[0].inv_wr;
519 first_wr = &ctx->reg[0].reg_wr.wr;
520 last_wr = &ctx->reg[ctx->nr_ops - 1].wr.wr;
522 case RDMA_RW_MULTI_WR:
523 first_wr = &ctx->map.wrs[0].wr;
524 last_wr = &ctx->map.wrs[ctx->nr_ops - 1].wr;
526 case RDMA_RW_SINGLE_WR:
527 first_wr = &ctx->single.wr.wr;
528 last_wr = &ctx->single.wr.wr;
535 last_wr->next = chain_wr;
537 last_wr->wr_cqe = cqe;
538 last_wr->send_flags |= IB_SEND_SIGNALED;
543 EXPORT_SYMBOL(rdma_rw_ctx_wrs);
546 * rdma_rw_ctx_post - post a RDMA READ or RDMA WRITE operation
547 * @ctx: context to operate on
548 * @qp: queue pair to operate on
549 * @port_num: port num to which the connection is bound
550 * @cqe: completion queue entry for the last WR
551 * @chain_wr: WR to append to the posted chain
553 * Post the set of RDMA READ/WRITE operations described by @ctx, as well as
554 * any memory registration operations needed. If @chain_wr is non-NULL the
555 * WR it points to will be appended to the chain of WRs posted. If @chain_wr
556 * is not set @cqe must be set so that the caller gets a completion
559 int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
560 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
562 struct ib_send_wr *first_wr;
564 first_wr = rdma_rw_ctx_wrs(ctx, qp, port_num, cqe, chain_wr);
565 return ib_post_send(qp, first_wr, NULL);
567 EXPORT_SYMBOL(rdma_rw_ctx_post);
570 * rdma_rw_ctx_destroy - release all resources allocated by rdma_rw_ctx_init
571 * @ctx: context to release
572 * @qp: queue pair to operate on
573 * @port_num: port num to which the connection is bound
574 * @sg: scatterlist that was used for the READ/WRITE
575 * @sg_cnt: number of entries in @sg
576 * @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ
578 void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
579 struct scatterlist *sg, u32 sg_cnt, enum dma_data_direction dir)
585 for (i = 0; i < ctx->nr_ops; i++)
586 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->reg[i].mr);
589 case RDMA_RW_MULTI_WR:
591 kfree(ctx->map.sges);
593 case RDMA_RW_SINGLE_WR:
600 /* P2PDMA contexts do not need to be unmapped */
601 if (!is_pci_p2pdma_page(sg_page(sg)))
602 ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
604 EXPORT_SYMBOL(rdma_rw_ctx_destroy);
607 * rdma_rw_ctx_destroy_signature - release all resources allocated by
608 * rdma_rw_ctx_init_signature
609 * @ctx: context to release
610 * @qp: queue pair to operate on
611 * @port_num: port num to which the connection is bound
612 * @sg: scatterlist that was used for the READ/WRITE
613 * @sg_cnt: number of entries in @sg
614 * @prot_sg: scatterlist that was used for the READ/WRITE of the PI
615 * @prot_sg_cnt: number of entries in @prot_sg
616 * @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ
618 void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
619 u8 port_num, struct scatterlist *sg, u32 sg_cnt,
620 struct scatterlist *prot_sg, u32 prot_sg_cnt,
621 enum dma_data_direction dir)
623 if (WARN_ON_ONCE(ctx->type != RDMA_RW_SIG_MR))
626 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->data.mr);
627 ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir);
629 if (ctx->sig->prot.mr) {
630 ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->prot.mr);
631 ib_dma_unmap_sg(qp->pd->device, prot_sg, prot_sg_cnt, dir);
634 ib_mr_pool_put(qp, &qp->sig_mrs, ctx->sig->sig_mr);
637 EXPORT_SYMBOL(rdma_rw_ctx_destroy_signature);
640 * rdma_rw_mr_factor - return number of MRs required for a payload
641 * @device: device handling the connection
642 * @port_num: port num to which the connection is bound
643 * @maxpages: maximum payload pages per rdma_rw_ctx
645 * Returns the number of MRs the device requires to move @maxpayload
646 * bytes. The returned value is used during transport creation to
647 * compute max_rdma_ctxts and the size of the transport's Send and
648 * Send Completion Queues.
650 unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num,
651 unsigned int maxpages)
653 unsigned int mr_pages;
655 if (rdma_rw_can_use_mr(device, port_num))
656 mr_pages = rdma_rw_fr_page_list_len(device);
658 mr_pages = device->attrs.max_sge_rd;
659 return DIV_ROUND_UP(maxpages, mr_pages);
661 EXPORT_SYMBOL(rdma_rw_mr_factor);
663 void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr)
667 WARN_ON_ONCE(attr->port_num == 0);
670 * Each context needs at least one RDMA READ or WRITE WR.
672 * For some hardware we might need more, eventually we should ask the
673 * HCA driver for a multiplier here.
678 * If the devices needs MRs to perform RDMA READ or WRITE operations,
679 * we'll need two additional MRs for the registrations and the
682 if (attr->create_flags & IB_QP_CREATE_SIGNATURE_EN)
683 factor += 6; /* (inv + reg) * (data + prot + sig) */
684 else if (rdma_rw_can_use_mr(dev, attr->port_num))
685 factor += 2; /* inv + reg */
687 attr->cap.max_send_wr += factor * attr->cap.max_rdma_ctxs;
690 * But maybe we were just too high in the sky and the device doesn't
691 * even support all we need, and we'll have to live with what we get..
693 attr->cap.max_send_wr =
694 min_t(u32, attr->cap.max_send_wr, dev->attrs.max_qp_wr);
697 int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr)
699 struct ib_device *dev = qp->pd->device;
700 u32 nr_mrs = 0, nr_sig_mrs = 0;
703 if (attr->create_flags & IB_QP_CREATE_SIGNATURE_EN) {
704 nr_sig_mrs = attr->cap.max_rdma_ctxs;
705 nr_mrs = attr->cap.max_rdma_ctxs * 2;
706 } else if (rdma_rw_can_use_mr(dev, attr->port_num)) {
707 nr_mrs = attr->cap.max_rdma_ctxs;
711 ret = ib_mr_pool_init(qp, &qp->rdma_mrs, nr_mrs,
713 rdma_rw_fr_page_list_len(dev));
715 pr_err("%s: failed to allocated %d MRs\n",
722 ret = ib_mr_pool_init(qp, &qp->sig_mrs, nr_sig_mrs,
723 IB_MR_TYPE_SIGNATURE, 2);
725 pr_err("%s: failed to allocated %d SIG MRs\n",
727 goto out_free_rdma_mrs;
734 ib_mr_pool_destroy(qp, &qp->rdma_mrs);
738 void rdma_rw_cleanup_mrs(struct ib_qp *qp)
740 ib_mr_pool_destroy(qp, &qp->sig_mrs);
741 ib_mr_pool_destroy(qp, &qp->rdma_mrs);