[mirror_ubuntu-eoan-kernel.git] / drivers / infiniband / ulp / iser / iser_memory.c

/*
 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *	- Redistributions of source code must retain the above
 *	  copyright notice, this list of conditions and the following
 *	  disclaimer.
 *
 *	- Redistributions in binary form must reproduce the above
 *	  copyright notice, this list of conditions and the following
 *	  disclaimer in the documentation and/or other materials
 *	  provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>

#include "iscsi_iser.h"
static
int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
		      struct iser_data_buf *mem,
		      struct iser_reg_resources *rsc,
		      struct iser_mem_reg *mem_reg);
static
int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
		     struct iser_data_buf *mem,
		     struct iser_reg_resources *rsc,
		     struct iser_mem_reg *mem_reg);

static const struct iser_reg_ops fastreg_ops = {
	.alloc_reg_res	= iser_alloc_fastreg_pool,
	.free_reg_res	= iser_free_fastreg_pool,
	.reg_mem	= iser_fast_reg_mr,
	.unreg_mem	= iser_unreg_mem_fastreg,
	.reg_desc_get	= iser_reg_desc_get_fr,
	.reg_desc_put	= iser_reg_desc_put_fr,
};

static const struct iser_reg_ops fmr_ops = {
	.alloc_reg_res	= iser_alloc_fmr_pool,
	.free_reg_res	= iser_free_fmr_pool,
	.reg_mem	= iser_fast_reg_fmr,
	.unreg_mem	= iser_unreg_mem_fmr,
	.reg_desc_get	= iser_reg_desc_get_fmr,
	.reg_desc_put	= iser_reg_desc_put_fmr,
};

void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)
{
	iser_err_comp(wc, "memreg");
}

int iser_assign_reg_ops(struct iser_device *device)
{
	struct ib_device *ib_dev = device->ib_device;

	/* Assign function handles  - based on FMR support */
	if (ib_dev->ops.alloc_fmr && ib_dev->ops.dealloc_fmr &&
	    ib_dev->ops.map_phys_fmr && ib_dev->ops.unmap_fmr) {
		iser_info("FMR supported, using FMR for registration\n");
		device->reg_ops = &fmr_ops;
	} else if (ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
		iser_info("FastReg supported, using FastReg for registration\n");
		device->reg_ops = &fastreg_ops;
		device->remote_inv_sup = iser_always_reg;
	} else {
		iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
		return -1;
	}

	return 0;
}

struct iser_fr_desc *
iser_reg_desc_get_fr(struct ib_conn *ib_conn)
{
	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
	struct iser_fr_desc *desc;
	unsigned long flags;

	spin_lock_irqsave(&fr_pool->lock, flags);
	desc = list_first_entry(&fr_pool->list,
				struct iser_fr_desc, list);
	list_del(&desc->list);
	spin_unlock_irqrestore(&fr_pool->lock, flags);

	return desc;
}

void
iser_reg_desc_put_fr(struct ib_conn *ib_conn,
		     struct iser_fr_desc *desc)
{
	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
	unsigned long flags;

	spin_lock_irqsave(&fr_pool->lock, flags);
	list_add(&desc->list, &fr_pool->list);
	spin_unlock_irqrestore(&fr_pool->lock, flags);
}

struct iser_fr_desc *
iser_reg_desc_get_fmr(struct ib_conn *ib_conn)
{
	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;

	return list_first_entry(&fr_pool->list,
				struct iser_fr_desc, list);
}

void
iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
		      struct iser_fr_desc *desc)
{
}

static void iser_data_buf_dump(struct iser_data_buf *data,
			       struct ib_device *ibdev)
{
	struct scatterlist *sg;
	int i;

	for_each_sg(data->sg, sg, data->dma_nents, i)
		iser_dbg("sg[%d] dma_addr:0x%lX page:0x%p "
			 "off:0x%x sz:0x%x dma_len:0x%x\n",
			 i, (unsigned long)sg_dma_address(sg),
			 sg_page(sg), sg->offset, sg->length, sg_dma_len(sg));
}

static void iser_dump_page_vec(struct iser_page_vec *page_vec)
{
	int i;

	iser_err("page vec npages %d data length %lld\n",
		 page_vec->npages, page_vec->fake_mr.length);
	for (i = 0; i < page_vec->npages; i++)
		iser_err("vec[%d]: %llx\n", i, page_vec->pages[i]);
}

int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
			    struct iser_data_buf *data,
			    enum iser_data_dir iser_dir,
			    enum dma_data_direction dma_dir)
{
	struct ib_device *dev;

	iser_task->dir[iser_dir] = 1;
	dev = iser_task->iser_conn->ib_conn.device->ib_device;

	data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
	if (data->dma_nents == 0) {
		iser_err("dma_map_sg failed!!!\n");
		return -EINVAL;
	}
	return 0;
}

void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
			      struct iser_data_buf *data,
			      enum dma_data_direction dir)
{
	struct ib_device *dev;

	dev = iser_task->iser_conn->ib_conn.device->ib_device;
	ib_dma_unmap_sg(dev, data->sg, data->size, dir);
}

static int
iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
	     struct iser_mem_reg *reg)
{
	struct scatterlist *sg = mem->sg;

	reg->sge.lkey = device->pd->local_dma_lkey;
	/*
	 * FIXME: rework the registration code path to differentiate
	 * rkey/lkey use cases
	 */

	if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
		reg->rkey = device->pd->unsafe_global_rkey;
	else
		reg->rkey = 0;
	reg->sge.addr = sg_dma_address(&sg[0]);
	reg->sge.length = sg_dma_len(&sg[0]);

	iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
		 " length=0x%x\n", reg->sge.lkey, reg->rkey,
		 reg->sge.addr, reg->sge.length);

	return 0;
}

static int iser_set_page(struct ib_mr *mr, u64 addr)
{
	struct iser_page_vec *page_vec =
		container_of(mr, struct iser_page_vec, fake_mr);

	page_vec->pages[page_vec->npages++] = addr;

	return 0;
}

static
int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
		      struct iser_data_buf *mem,
		      struct iser_reg_resources *rsc,
		      struct iser_mem_reg *reg)
{
	struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
	struct iser_device *device = ib_conn->device;
	struct iser_page_vec *page_vec = rsc->page_vec;
	struct ib_fmr_pool *fmr_pool = rsc->fmr_pool;
	struct ib_pool_fmr *fmr;
	int ret, plen;

	page_vec->npages = 0;
	page_vec->fake_mr.page_size = SIZE_4K;
	plen = ib_sg_to_pages(&page_vec->fake_mr, mem->sg,
			      mem->dma_nents, NULL, iser_set_page);
	if (unlikely(plen < mem->dma_nents)) {
		iser_err("page vec too short to hold this SG\n");
		iser_data_buf_dump(mem, device->ib_device);
		iser_dump_page_vec(page_vec);
		return -EINVAL;
	}

	fmr  = ib_fmr_pool_map_phys(fmr_pool, page_vec->pages,
				    page_vec->npages, page_vec->pages[0]);
	if (IS_ERR(fmr)) {
		ret = PTR_ERR(fmr);
		iser_err("ib_fmr_pool_map_phys failed: %d\n", ret);
		return ret;
	}

	reg->sge.lkey = fmr->fmr->lkey;
	reg->rkey = fmr->fmr->rkey;
	reg->sge.addr = page_vec->fake_mr.iova;
	reg->sge.length = page_vec->fake_mr.length;
	reg->mem_h = fmr;

	iser_dbg("fmr reg: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
		 " length=0x%x\n", reg->sge.lkey, reg->rkey,
		 reg->sge.addr, reg->sge.length);

	return 0;
}

/**
 * Unregister (previosuly registered using FMR) memory.
 * If memory is non-FMR does nothing.
 */
void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
			enum iser_data_dir cmd_dir)
{
	struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];

	if (!reg->mem_h)
		return;

	iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n", reg->mem_h);

	ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);

	reg->mem_h = NULL;
}

void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
			    enum iser_data_dir cmd_dir)
{
	struct iser_device *device = iser_task->iser_conn->ib_conn.device;
	struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];

	if (!reg->mem_h)
		return;

	device->reg_ops->reg_desc_put(&iser_task->iser_conn->ib_conn,
				     reg->mem_h);
	reg->mem_h = NULL;
}

static void
iser_set_dif_domain(struct scsi_cmnd *sc, struct ib_sig_domain *domain)
{
	domain->sig_type = IB_SIG_TYPE_T10_DIF;
	domain->sig.dif.pi_interval = scsi_prot_interval(sc);
	domain->sig.dif.ref_tag = t10_pi_ref_tag(sc->request);
	/*
	 * At the moment we hard code those, but in the future
	 * we will take them from sc.
	 */
	domain->sig.dif.apptag_check_mask = 0xffff;
	domain->sig.dif.app_escape = true;
	domain->sig.dif.ref_escape = true;
	if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
		domain->sig.dif.ref_remap = true;
};

static int
iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs)
{
	switch (scsi_get_prot_op(sc)) {
	case SCSI_PROT_WRITE_INSERT:
	case SCSI_PROT_READ_STRIP:
		sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
		iser_set_dif_domain(sc, &sig_attrs->wire);
		sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
		break;
	case SCSI_PROT_READ_INSERT:
	case SCSI_PROT_WRITE_STRIP:
		sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
		iser_set_dif_domain(sc, &sig_attrs->mem);
		sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
						IB_T10DIF_CSUM : IB_T10DIF_CRC;
		break;
	case SCSI_PROT_READ_PASS:
	case SCSI_PROT_WRITE_PASS:
		iser_set_dif_domain(sc, &sig_attrs->wire);
		sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
		iser_set_dif_domain(sc, &sig_attrs->mem);
		sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
						IB_T10DIF_CSUM : IB_T10DIF_CRC;
		break;
	default:
		iser_err("Unsupported PI operation %d\n",
			 scsi_get_prot_op(sc));
		return -EINVAL;
	}

	return 0;
}

static inline void
iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
{
	*mask = 0;
	if (sc->prot_flags & SCSI_PROT_REF_CHECK)
		*mask |= IB_SIG_CHECK_REFTAG;
	if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
		*mask |= IB_SIG_CHECK_GUARD;
}

static inline void
iser_inv_rkey(struct ib_send_wr *inv_wr,
	      struct ib_mr *mr,
	      struct ib_cqe *cqe,
	      struct ib_send_wr *next_wr)
{
	inv_wr->opcode = IB_WR_LOCAL_INV;
	inv_wr->wr_cqe = cqe;
	inv_wr->ex.invalidate_rkey = mr->rkey;
	inv_wr->send_flags = 0;
	inv_wr->num_sge = 0;
	inv_wr->next = next_wr;
}

static int
iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
		struct iser_data_buf *mem,
		struct iser_data_buf *sig_mem,
		struct iser_reg_resources *rsc,
		struct iser_mem_reg *sig_reg)
{
	struct iser_tx_desc *tx_desc = &iser_task->desc;
	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
	struct ib_mr *mr = rsc->sig_mr;
	struct ib_sig_attrs *sig_attrs = mr->sig_attrs;
	struct ib_reg_wr *wr = &tx_desc->reg_wr;
	int ret;

	memset(sig_attrs, 0, sizeof(*sig_attrs));
	ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
	if (ret)
		goto err;

	iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);

	if (rsc->mr_valid)
		iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);

	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));

	ret = ib_map_mr_sg_pi(mr, mem->sg, mem->dma_nents, NULL,
			      sig_mem->sg, sig_mem->dma_nents, NULL, SZ_4K);
	if (unlikely(ret)) {
		iser_err("failed to map PI sg (%d)\n",
			 mem->dma_nents + sig_mem->dma_nents);
		goto err;
	}

	memset(wr, 0, sizeof(*wr));
	wr->wr.next = &tx_desc->send_wr;
	wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
	wr->wr.wr_cqe = cqe;
	wr->wr.num_sge = 0;
	wr->wr.send_flags = 0;
	wr->mr = mr;
	wr->key = mr->rkey;
	wr->access = IB_ACCESS_LOCAL_WRITE |
		     IB_ACCESS_REMOTE_READ |
		     IB_ACCESS_REMOTE_WRITE;
	rsc->mr_valid = 1;

	sig_reg->sge.lkey = mr->lkey;
	sig_reg->rkey = mr->rkey;
	sig_reg->sge.addr = mr->iova;
	sig_reg->sge.length = mr->length;

	iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
		 sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
		 sig_reg->sge.length);
err:
	return ret;
}

static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
			    struct iser_data_buf *mem,
			    struct iser_reg_resources *rsc,
			    struct iser_mem_reg *reg)
{
	struct iser_tx_desc *tx_desc = &iser_task->desc;
	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
	struct ib_mr *mr = rsc->mr;
	struct ib_reg_wr *wr = &tx_desc->reg_wr;
	int n;

	if (rsc->mr_valid)
		iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);

	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));

	n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SIZE_4K);
	if (unlikely(n != mem->dma_nents)) {
		iser_err("failed to map sg (%d/%d)\n",
			 n, mem->dma_nents);
		return n < 0 ? n : -EINVAL;
	}

	wr->wr.next = &tx_desc->send_wr;
	wr->wr.opcode = IB_WR_REG_MR;
	wr->wr.wr_cqe = cqe;
	wr->wr.send_flags = 0;
	wr->wr.num_sge = 0;
	wr->mr = mr;
	wr->key = mr->rkey;
	wr->access = IB_ACCESS_LOCAL_WRITE  |
		     IB_ACCESS_REMOTE_WRITE |
		     IB_ACCESS_REMOTE_READ;

	rsc->mr_valid = 1;

	reg->sge.lkey = mr->lkey;
	reg->rkey = mr->rkey;
	reg->sge.addr = mr->iova;
	reg->sge.length = mr->length;

	iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n",
		 reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length);

	return 0;
}

static int
iser_reg_data_sg(struct iscsi_iser_task *task,
		 struct iser_data_buf *mem,
		 struct iser_fr_desc *desc,
		 bool use_dma_key,
		 struct iser_mem_reg *reg)
{
	struct iser_device *device = task->iser_conn->ib_conn.device;

	if (use_dma_key)
		return iser_reg_dma(device, mem, reg);

	return device->reg_ops->reg_mem(task, mem, &desc->rsc, reg);
}

int iser_reg_rdma_mem(struct iscsi_iser_task *task,
		      enum iser_data_dir dir,
		      bool all_imm)
{
	struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
	struct iser_device *device = ib_conn->device;
	struct iser_data_buf *mem = &task->data[dir];
	struct iser_mem_reg *reg = &task->rdma_reg[dir];
	struct iser_fr_desc *desc = NULL;
	bool use_dma_key;
	int err;

	use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) &&
		      scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;

	if (!use_dma_key) {
		desc = device->reg_ops->reg_desc_get(ib_conn);
		reg->mem_h = desc;
	}

	if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) {
		err = iser_reg_data_sg(task, mem, desc, use_dma_key, reg);
		if (unlikely(err))
			goto err_reg;
	} else {
		err = iser_reg_sig_mr(task, mem, &task->prot[dir],
				      &desc->rsc, reg);
		if (unlikely(err))
			goto err_reg;

		desc->sig_protected = 1;
	}

	return 0;

err_reg:
	if (desc)
		device->reg_ops->reg_desc_put(ib_conn, desc);

	return err;
}

void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
			 enum iser_data_dir dir)
{
	struct iser_device *device = task->iser_conn->ib_conn.device;

	device->reg_ops->unreg_mem(task, dir);
}
Commit	Line	Data
6461f64a OG	1	/*
6461f64a OG	2	* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3ee07d27	3	* Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
6461f64a OG	4	*
	5	* This software is available to you under a choice of one of two
	6	* licenses. You may choose to be licensed under the terms of the GNU
	7	* General Public License (GPL) Version 2, available from the file
	8	* COPYING in the main directory of this source tree, or the
	9	* OpenIB.org BSD license below:
	10	*
	11	* Redistribution and use in source and binary forms, with or
	12	* without modification, are permitted provided that the following
	13	* conditions are met:
	14	*
	15	* - Redistributions of source code must retain the above
	16	* copyright notice, this list of conditions and the following
	17	* disclaimer.
	18	*
	19	* - Redistributions in binary form must reproduce the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer in the documentation and/or other materials
	22	* provided with the distribution.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	25	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	26	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	27	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	28	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	29	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	30	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	31	* SOFTWARE.
6461f64a OG	32	*/
	33	#include <linux/module.h>
	34	#include <linux/kernel.h>
	35	#include <linux/slab.h>
	36	#include <linux/mm.h>
a1f8e7f7	37	#include <linux/highmem.h>
6461f64a OG	38	#include <linux/scatterlist.h>
	39
	40	#include "iscsi_iser.h"
32467c42 SG	41	static
	42	int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
	43	struct iser_data_buf *mem,
	44	struct iser_reg_resources *rsc,
	45	struct iser_mem_reg *mem_reg);
	46	static
	47	int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
	48	struct iser_data_buf *mem,
	49	struct iser_reg_resources *rsc,
	50	struct iser_mem_reg *mem_reg);
6461f64a	51
2392a4cd	52	static const struct iser_reg_ops fastreg_ops = {
48afbff6 SG	53	.alloc_reg_res = iser_alloc_fastreg_pool,
48afbff6 SG	54	.free_reg_res = iser_free_fastreg_pool,
32467c42 SG	55	.reg_mem = iser_fast_reg_mr,
32467c42 SG	56	.unreg_mem = iser_unreg_mem_fastreg,
81722909 SG	57	.reg_desc_get = iser_reg_desc_get_fr,
81722909 SG	58	.reg_desc_put = iser_reg_desc_put_fr,
48afbff6 SG	59	};
48afbff6 SG	60
2392a4cd	61	static const struct iser_reg_ops fmr_ops = {
48afbff6 SG	62	.alloc_reg_res = iser_alloc_fmr_pool,
48afbff6 SG	63	.free_reg_res = iser_free_fmr_pool,
32467c42 SG	64	.reg_mem = iser_fast_reg_fmr,
32467c42 SG	65	.unreg_mem = iser_unreg_mem_fmr,
81722909 SG	66	.reg_desc_get = iser_reg_desc_get_fmr,
81722909 SG	67	.reg_desc_put = iser_reg_desc_put_fmr,
48afbff6 SG	68	};
48afbff6 SG	69
cfeb91b3 CH	70	void iser_reg_comp(struct ib_cq cq, struct ib_wc wc)
	71	{
	72	iser_err_comp(wc, "memreg");
	73	}
	74
48afbff6 SG	75	int iser_assign_reg_ops(struct iser_device *device)
48afbff6 SG	76	{
4a061b28	77	struct ib_device *ib_dev = device->ib_device;
48afbff6 SG	78
48afbff6 SG	79	/* Assign function handles - based on FMR support */
3023a1e9 KH	80	if (ib_dev->ops.alloc_fmr && ib_dev->ops.dealloc_fmr &&
3023a1e9 KH	81	ib_dev->ops.map_phys_fmr && ib_dev->ops.unmap_fmr) {
48afbff6 SG	82	iser_info("FMR supported, using FMR for registration\n");
48afbff6 SG	83	device->reg_ops = &fmr_ops;
4a061b28	84	} else if (ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
48afbff6 SG	85	iser_info("FastReg supported, using FastReg for registration\n");
48afbff6 SG	86	device->reg_ops = &fastreg_ops;
59caaed7	87	device->remote_inv_sup = iser_always_reg;
48afbff6 SG	88	} else {
	89	iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
	90	return -1;
	91	}
	92
	93	return 0;
	94	}
	95
5190cc26	96	struct iser_fr_desc *
81722909	97	iser_reg_desc_get_fr(struct ib_conn *ib_conn)
bd8b944e	98	{
385ad87d	99	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
5190cc26	100	struct iser_fr_desc *desc;
bd8b944e SG	101	unsigned long flags;
bd8b944e SG	102
385ad87d	103	spin_lock_irqsave(&fr_pool->lock, flags);
2b3bf958	104	desc = list_first_entry(&fr_pool->list,
5190cc26	105	struct iser_fr_desc, list);
bd8b944e	106	list_del(&desc->list);
385ad87d	107	spin_unlock_irqrestore(&fr_pool->lock, flags);
bd8b944e SG	108
	109	return desc;
	110	}
	111
	112	void
81722909 SG	113	iser_reg_desc_put_fr(struct ib_conn *ib_conn,
81722909 SG	114	struct iser_fr_desc *desc)
bd8b944e	115	{
385ad87d	116	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
bd8b944e SG	117	unsigned long flags;
bd8b944e SG	118
385ad87d	119	spin_lock_irqsave(&fr_pool->lock, flags);
2b3bf958	120	list_add(&desc->list, &fr_pool->list);
385ad87d	121	spin_unlock_irqrestore(&fr_pool->lock, flags);
bd8b944e SG	122	}
bd8b944e SG	123
81722909 SG	124	struct iser_fr_desc *
	125	iser_reg_desc_get_fmr(struct ib_conn *ib_conn)
	126	{
	127	struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
	128
	129	return list_first_entry(&fr_pool->list,
	130	struct iser_fr_desc, list);
	131	}
	132
	133	void
	134	iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
	135	struct iser_fr_desc *desc)
	136	{
	137	}
	138
5180311f RC	139	static void iser_data_buf_dump(struct iser_data_buf *data,
5180311f RC	140	struct ib_device *ibdev)
6461f64a	141	{
53d412fc	142	struct scatterlist *sg;
6461f64a OG	143	int i;
6461f64a OG	144
e3784bd1	145	for_each_sg(data->sg, sg, data->dma_nents, i)
f91424cf	146	iser_dbg("sg[%d] dma_addr:0x%lX page:0x%p "
e981f1d4	147	"off:0x%x sz:0x%x dma_len:0x%x\n",
a163afc8 BVA	148	i, (unsigned long)sg_dma_address(sg),
a163afc8 BVA	149	sg_page(sg), sg->offset, sg->length, sg_dma_len(sg));
6461f64a OG	150	}
	151
	152	static void iser_dump_page_vec(struct iser_page_vec *page_vec)
	153	{
	154	int i;
	155
edd31551	156	iser_err("page vec npages %d data length %lld\n",
bfe066e2 SG	157	page_vec->npages, page_vec->fake_mr.length);
	158	for (i = 0; i < page_vec->npages; i++)
	159	iser_err("vec[%d]: %llx\n", i, page_vec->pages[i]);
6461f64a OG	160	}
6461f64a OG	161
2261ec3d MC	162	int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
	163	struct iser_data_buf *data,
	164	enum iser_data_dir iser_dir,
	165	enum dma_data_direction dma_dir)
74a20780	166	{
5180311f	167	struct ib_device *dev;
74a20780	168
2261ec3d	169	iser_task->dir[iser_dir] = 1;
a4ee3539	170	dev = iser_task->iser_conn->ib_conn.device->ib_device;
74a20780	171
e3784bd1	172	data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
74a20780 EZ	173	if (data->dma_nents == 0) {
	174	iser_err("dma_map_sg failed!!!\n");
	175	return -EINVAL;
	176	}
	177	return 0;
	178	}
	179
9a8b08fa	180	void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
c6c95ef4 RD	181	struct iser_data_buf *data,
c6c95ef4 RD	182	enum dma_data_direction dir)
74a20780	183	{
5180311f	184	struct ib_device *dev;
74a20780	185
a4ee3539	186	dev = iser_task->iser_conn->ib_conn.device->ib_device;
e3784bd1	187	ib_dma_unmap_sg(dev, data->sg, data->size, dir);
74a20780 EZ	188	}
74a20780 EZ	189
ad1e5672 SG	190	static int
	191	iser_reg_dma(struct iser_device device, struct iser_data_buf mem,
	192	struct iser_mem_reg *reg)
	193	{
	194	struct scatterlist *sg = mem->sg;
	195
256b7ad2	196	reg->sge.lkey = device->pd->local_dma_lkey;
b5f04b00 JD	197	/*
	198	* FIXME: rework the registration code path to differentiate
	199	* rkey/lkey use cases
	200	*/
8e61212d CH	201
	202	if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
	203	reg->rkey = device->pd->unsafe_global_rkey;
	204	else
	205	reg->rkey = 0;
a163afc8 BVA	206	reg->sge.addr = sg_dma_address(&sg[0]);
a163afc8 BVA	207	reg->sge.length = sg_dma_len(&sg[0]);
ad1e5672 SG	208
	209	iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
	210	" length=0x%x\n", reg->sge.lkey, reg->rkey,
	211	reg->sge.addr, reg->sge.length);
	212
	213	return 0;
	214	}
	215
bfe066e2 SG	216	static int iser_set_page(struct ib_mr *mr, u64 addr)
	217	{
	218	struct iser_page_vec *page_vec =
	219	container_of(mr, struct iser_page_vec, fake_mr);
	220
	221	page_vec->pages[page_vec->npages++] = addr;
	222
	223	return 0;
	224	}
	225
d03e61d0	226	static
7d0483c9	227	int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
f0e35c27	228	struct iser_data_buf *mem,
2b3bf958	229	struct iser_reg_resources *rsc,
7d0483c9	230	struct iser_mem_reg *reg)
d03e61d0	231	{
f0e35c27 SG	232	struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
f0e35c27 SG	233	struct iser_device *device = ib_conn->device;
2b3bf958 AL	234	struct iser_page_vec *page_vec = rsc->page_vec;
2b3bf958 AL	235	struct ib_fmr_pool *fmr_pool = rsc->fmr_pool;
f0e35c27 SG	236	struct ib_pool_fmr *fmr;
	237	int ret, plen;
	238
bfe066e2 SG	239	page_vec->npages = 0;
	240	page_vec->fake_mr.page_size = SIZE_4K;
	241	plen = ib_sg_to_pages(&page_vec->fake_mr, mem->sg,
57b26497 IR	242	mem->dma_nents, NULL, iser_set_page);
57b26497 IR	243	if (unlikely(plen < mem->dma_nents)) {
f0e35c27 SG	244	iser_err("page vec too short to hold this SG\n");
	245	iser_data_buf_dump(mem, device->ib_device);
	246	iser_dump_page_vec(page_vec);
	247	return -EINVAL;
	248	}
d03e61d0	249
bfe066e2 SG	250	fmr = ib_fmr_pool_map_phys(fmr_pool, page_vec->pages,
bfe066e2 SG	251	page_vec->npages, page_vec->pages[0]);
f0e35c27 SG	252	if (IS_ERR(fmr)) {
	253	ret = PTR_ERR(fmr);
	254	iser_err("ib_fmr_pool_map_phys failed: %d\n", ret);
	255	return ret;
d03e61d0 SG	256	}
d03e61d0 SG	257
7d0483c9 SG	258	reg->sge.lkey = fmr->fmr->lkey;
7d0483c9 SG	259	reg->rkey = fmr->fmr->rkey;
bfe066e2 SG	260	reg->sge.addr = page_vec->fake_mr.iova;
bfe066e2 SG	261	reg->sge.length = page_vec->fake_mr.length;
7d0483c9	262	reg->mem_h = fmr;
f0e35c27	263
1b16c989 SG	264	iser_dbg("fmr reg: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
	265	" length=0x%x\n", reg->sge.lkey, reg->rkey,
	266	reg->sge.addr, reg->sge.length);
	267
d03e61d0 SG	268	return 0;
	269	}
	270
	271	/**
	272	* Unregister (previosuly registered using FMR) memory.
	273	* If memory is non-FMR does nothing.
	274	*/
	275	void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
	276	enum iser_data_dir cmd_dir)
	277	{
b130eded	278	struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
d03e61d0 SG	279
	280	if (!reg->mem_h)
	281	return;
	282
	283	iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n", reg->mem_h);
	284
3eeeb7a5	285	ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
d03e61d0 SG	286
	287	reg->mem_h = NULL;
	288	}
	289
	290	void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
	291	enum iser_data_dir cmd_dir)
	292	{
81722909	293	struct iser_device *device = iser_task->iser_conn->ib_conn.device;
b130eded	294	struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
d03e61d0	295
bd8b944e	296	if (!reg->mem_h)
d03e61d0 SG	297	return;
d03e61d0 SG	298
81722909 SG	299	device->reg_ops->reg_desc_put(&iser_task->iser_conn->ib_conn,
81722909 SG	300	reg->mem_h);
d03e61d0	301	reg->mem_h = NULL;
d03e61d0 SG	302	}
d03e61d0 SG	303
5bb6e543	304	static void
0cc2896f	305	iser_set_dif_domain(struct scsi_cmnd sc, struct ib_sig_domain domain)
92792c0a	306	{
78eda2bb	307	domain->sig_type = IB_SIG_TYPE_T10_DIF;
5bb6e543	308	domain->sig.dif.pi_interval = scsi_prot_interval(sc);
ddd0bc75	309	domain->sig.dif.ref_tag = t10_pi_ref_tag(sc->request);
78eda2bb SG	310	/*
	311	* At the moment we hard code those, but in the future
	312	* we will take them from sc.
	313	*/
	314	domain->sig.dif.apptag_check_mask = 0xffff;
	315	domain->sig.dif.app_escape = true;
	316	domain->sig.dif.ref_escape = true;
5bb6e543	317	if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
78eda2bb	318	domain->sig.dif.ref_remap = true;
92792c0a	319	};
177e31bd SG	320
	321	static int
	322	iser_set_sig_attrs(struct scsi_cmnd sc, struct ib_sig_attrs sig_attrs)
	323	{
177e31bd SG	324	switch (scsi_get_prot_op(sc)) {
	325	case SCSI_PROT_WRITE_INSERT:
	326	case SCSI_PROT_READ_STRIP:
78eda2bb	327	sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
0cc2896f	328	iser_set_dif_domain(sc, &sig_attrs->wire);
177e31bd	329	sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
177e31bd SG	330	break;
	331	case SCSI_PROT_READ_INSERT:
	332	case SCSI_PROT_WRITE_STRIP:
78eda2bb	333	sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
0cc2896f	334	iser_set_dif_domain(sc, &sig_attrs->mem);
5bb6e543 SG	335	sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
5bb6e543 SG	336	IB_T10DIF_CSUM : IB_T10DIF_CRC;
177e31bd SG	337	break;
	338	case SCSI_PROT_READ_PASS:
	339	case SCSI_PROT_WRITE_PASS:
0cc2896f	340	iser_set_dif_domain(sc, &sig_attrs->wire);
177e31bd	341	sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
0cc2896f	342	iser_set_dif_domain(sc, &sig_attrs->mem);
5bb6e543 SG	343	sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
5bb6e543 SG	344	IB_T10DIF_CSUM : IB_T10DIF_CRC;
177e31bd SG	345	break;
	346	default:
	347	iser_err("Unsupported PI operation %d\n",
	348	scsi_get_prot_op(sc));
	349	return -EINVAL;
	350	}
78eda2bb	351
177e31bd SG	352	return 0;
	353	}
	354
5bb6e543	355	static inline void
177e31bd SG	356	iser_set_prot_checks(struct scsi_cmnd sc, u8 mask)
177e31bd SG	357	{
5bb6e543 SG	358	*mask = 0;
5bb6e543 SG	359	if (sc->prot_flags & SCSI_PROT_REF_CHECK)
c6c2c03a	360	*mask \|= IB_SIG_CHECK_REFTAG;
5bb6e543	361	if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
c6c2c03a	362	*mask \|= IB_SIG_CHECK_GUARD;
177e31bd SG	363	}
177e31bd SG	364
e26d2d21	365	static inline void
cfeb91b3 CH	366	iser_inv_rkey(struct ib_send_wr *inv_wr,
cfeb91b3 CH	367	struct ib_mr *mr,
b9294f8b IR	368	struct ib_cqe *cqe,
b9294f8b IR	369	struct ib_send_wr *next_wr)
a11b3e69	370	{
a11b3e69	371	inv_wr->opcode = IB_WR_LOCAL_INV;
cfeb91b3	372	inv_wr->wr_cqe = cqe;
a11b3e69	373	inv_wr->ex.invalidate_rkey = mr->rkey;
7332bed0 SG	374	inv_wr->send_flags = 0;
7332bed0 SG	375	inv_wr->num_sge = 0;
b9294f8b	376	inv_wr->next = next_wr;
a11b3e69 SG	377	}
a11b3e69 SG	378
177e31bd SG	379	static int
177e31bd SG	380	iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
b76a4399 IR	381	struct iser_data_buf *mem,
	382	struct iser_data_buf *sig_mem,
	383	struct iser_reg_resources *rsc,
6ef8bb83	384	struct iser_mem_reg *sig_reg)
177e31bd	385	{
7332bed0	386	struct iser_tx_desc *tx_desc = &iser_task->desc;
cfeb91b3	387	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
b76a4399 IR	388	struct ib_mr *mr = rsc->sig_mr;
b76a4399 IR	389	struct ib_sig_attrs *sig_attrs = mr->sig_attrs;
b9294f8b	390	struct ib_reg_wr *wr = &tx_desc->reg_wr;
177e31bd	391	int ret;
177e31bd	392
7332bed0 SG	393	memset(sig_attrs, 0, sizeof(*sig_attrs));
7332bed0 SG	394	ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
177e31bd SG	395	if (ret)
	396	goto err;
	397
7332bed0	398	iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
177e31bd	399
b76a4399	400	if (rsc->mr_valid)
b9294f8b	401	iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
e26d2d21 SG	402
e26d2d21 SG	403	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
e622f2f4	404
b76a4399 IR	405	ret = ib_map_mr_sg_pi(mr, mem->sg, mem->dma_nents, NULL,
	406	sig_mem->sg, sig_mem->dma_nents, NULL, SZ_4K);
	407	if (unlikely(ret)) {
	408	iser_err("failed to map PI sg (%d)\n",
	409	mem->dma_nents + sig_mem->dma_nents);
	410	goto err;
	411	}
	412
b76a4399	413	memset(wr, 0, sizeof(*wr));
b9294f8b	414	wr->wr.next = &tx_desc->send_wr;
b76a4399	415	wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
cfeb91b3	416	wr->wr.wr_cqe = cqe;
b76a4399	417	wr->wr.num_sge = 0;
e622f2f4	418	wr->wr.send_flags = 0;
b76a4399 IR	419	wr->mr = mr;
	420	wr->key = mr->rkey;
	421	wr->access = IB_ACCESS_LOCAL_WRITE \|
	422	IB_ACCESS_REMOTE_READ \|
	423	IB_ACCESS_REMOTE_WRITE;
	424	rsc->mr_valid = 1;
177e31bd	425
e26d2d21 SG	426	sig_reg->sge.lkey = mr->lkey;
e26d2d21 SG	427	sig_reg->rkey = mr->rkey;
b76a4399 IR	428	sig_reg->sge.addr = mr->iova;
b76a4399 IR	429	sig_reg->sge.length = mr->length;
177e31bd	430
39405885	431	iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
6ef8bb83 SG	432	sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
6ef8bb83 SG	433	sig_reg->sge.length);
177e31bd SG	434	err:
	435	return ret;
	436	}
	437
d11ec4ec	438	static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
d11ec4ec	439	struct iser_data_buf *mem,
d711d81d	440	struct iser_reg_resources *rsc,
6ef8bb83	441	struct iser_mem_reg *reg)
5587856c	442	{
7332bed0	443	struct iser_tx_desc *tx_desc = &iser_task->desc;
cfeb91b3	444	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
39405885	445	struct ib_mr *mr = rsc->mr;
b9294f8b	446	struct ib_reg_wr *wr = &tx_desc->reg_wr;
39405885	447	int n;
5587856c	448
1caa70d8	449	if (rsc->mr_valid)
b9294f8b	450	iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
e622f2f4	451
e26d2d21 SG	452	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
e26d2d21 SG	453
57b26497 IR	454	n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SIZE_4K);
57b26497 IR	455	if (unlikely(n != mem->dma_nents)) {
39405885	456	iser_err("failed to map sg (%d/%d)\n",
57b26497	457	n, mem->dma_nents);
39405885 SG	458	return n < 0 ? n : -EINVAL;
	459	}
	460
b9294f8b	461	wr->wr.next = &tx_desc->send_wr;
39405885	462	wr->wr.opcode = IB_WR_REG_MR;
cfeb91b3	463	wr->wr.wr_cqe = cqe;
e622f2f4	464	wr->wr.send_flags = 0;
39405885 SG	465	wr->wr.num_sge = 0;
	466	wr->mr = mr;
	467	wr->key = mr->rkey;
	468	wr->access = IB_ACCESS_LOCAL_WRITE \|
	469	IB_ACCESS_REMOTE_WRITE \|
	470	IB_ACCESS_REMOTE_READ;
	471
1caa70d8	472	rsc->mr_valid = 1;
5587856c	473
6ef8bb83 SG	474	reg->sge.lkey = mr->lkey;
6ef8bb83 SG	475	reg->rkey = mr->rkey;
39405885 SG	476	reg->sge.addr = mr->iova;
39405885 SG	477	reg->sge.length = mr->length;
5587856c	478
39405885 SG	479	iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n",
39405885 SG	480	reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length);
1b16c989	481
7332bed0	482	return 0;
5587856c SG	483	}
5587856c SG	484
32467c42 SG	485	static int
	486	iser_reg_data_sg(struct iscsi_iser_task *task,
	487	struct iser_data_buf *mem,
	488	struct iser_fr_desc *desc,
3cffd930	489	bool use_dma_key,
32467c42 SG	490	struct iser_mem_reg *reg)
	491	{
	492	struct iser_device *device = task->iser_conn->ib_conn.device;
	493
3cffd930	494	if (use_dma_key)
32467c42 SG	495	return iser_reg_dma(device, mem, reg);
	496
	497	return device->reg_ops->reg_mem(task, mem, &desc->rsc, reg);
	498	}
	499
	500	int iser_reg_rdma_mem(struct iscsi_iser_task *task,
b5f04b00 JD	501	enum iser_data_dir dir,
b5f04b00 JD	502	bool all_imm)
32467c42 SG	503	{
	504	struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
	505	struct iser_device *device = ib_conn->device;
	506	struct iser_data_buf *mem = &task->data[dir];
	507	struct iser_mem_reg *reg = &task->rdma_reg[dir];
	508	struct iser_fr_desc *desc = NULL;
3cffd930	509	bool use_dma_key;
32467c42 SG	510	int err;
32467c42 SG	511
b5f04b00 JD	512	use_dma_key = mem->dma_nents == 1 && (all_imm \|\| !iser_always_reg) &&
b5f04b00 JD	513	scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;
3cffd930 SG	514
3cffd930 SG	515	if (!use_dma_key) {
81722909	516	desc = device->reg_ops->reg_desc_get(ib_conn);
32467c42	517	reg->mem_h = desc;
d11ec4ec	518	}
5587856c	519
b76a4399 IR	520	if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) {
	521	err = iser_reg_data_sg(task, mem, desc, use_dma_key, reg);
	522	if (unlikely(err))
	523	goto err_reg;
	524	} else {
	525	err = iser_reg_sig_mr(task, mem, &task->prot[dir],
	526	&desc->rsc, reg);
32467c42 SG	527	if (unlikely(err))
	528	goto err_reg;
	529
b76a4399	530	desc->sig_protected = 1;
177e31bd	531	}
d11ec4ec	532
5587856c	533	return 0;
32467c42	534
5587856c	535	err_reg:
bd8b944e	536	if (desc)
81722909	537	device->reg_ops->reg_desc_put(ib_conn, desc);
d11ec4ec	538
5587856c SG	539	return err;
5587856c SG	540	}
32467c42 SG	541
	542	void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
	543	enum iser_data_dir dir)
	544	{
	545	struct iser_device *device = task->iser_conn->ib_conn.device;
	546
	547	device->reg_ops->unreg_mem(task, dir);
	548	}