/* * 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/kernel.h>#include <linux/slab.h>#include <linux/mm.h>#include <linux/highmem.h>#include <linux/scatterlist.h> #include "iscsi_iser.h" void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc){ iser_err_comp(wc, "memreg");} static 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;} static 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);} int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, enum iser_data_dir iser_dir, enum dma_data_direction dma_dir){ struct iser_data_buf *data = &iser_task->data[iser_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 (unlikely(data->dma_nents == 0)) { iser_err("dma_map_sg failed!!!\n"); return -EINVAL; } if (scsi_prot_sg_count(iser_task->sc)) { struct iser_data_buf *pdata = &iser_task->prot[iser_dir]; pdata->dma_nents = ib_dma_map_sg(dev, pdata->sg, pdata->size, dma_dir); if (unlikely(pdata->dma_nents == 0)) { iser_err("protection dma_map_sg failed!!!\n"); goto out_unmap; } } return 0; out_unmap: ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir); return -EINVAL;} void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, enum iser_data_dir iser_dir, enum dma_data_direction dma_dir){ struct iser_data_buf *data = &iser_task->data[iser_dir]; struct ib_device *dev; dev = iser_task->iser_conn->ib_conn.device->ib_device; ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir); if (scsi_prot_sg_count(iser_task->sc)) { struct iser_data_buf *pdata = &iser_task->prot[iser_dir]; ib_dma_unmap_sg(dev, pdata->sg, pdata->size, dma_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;} void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, enum iser_data_dir cmd_dir){ struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; struct iser_fr_desc *desc; struct ib_mr_status mr_status; desc = reg->desc; if (!desc) return; /* * The signature MR cannot be invalidated and reused without checking. * libiscsi calls the check_protection transport handler only if * SCSI-Response is received. And the signature MR is not checked if * the task is completed for some other reason like a timeout or error * handling. That's why we must check the signature MR here before * putting it to the free pool. */ if (unlikely(desc->sig_protected)) { desc->sig_protected = false; ib_check_mr_status(desc->rsc.sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status); } iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->desc); reg->desc = 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(scsi_cmd_to_rq(sc)); /* * 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->sig_mr->need_inval) 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->sig_mr->need_inval = true; 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->need_inval) 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, SZ_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->need_inval = true; 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;} int iser_reg_mem_fastreg(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; 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) return iser_reg_dma(device, mem, reg); desc = iser_reg_desc_get_fr(ib_conn); if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) { err = iser_fast_reg_mr(task, mem, &desc->rsc, 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 = true; } reg->desc = desc; return 0; err_reg: iser_reg_desc_put_fr(ib_conn, desc); return err;}
/*
* 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/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>
#include "iscsi_iser.h"
void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)
{
iser_err_comp(wc, "memreg");
}
static 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;
}
static 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);
}
int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
enum iser_data_dir iser_dir,
enum dma_data_direction dma_dir)
{
struct iser_data_buf *data = &iser_task->data[iser_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 (unlikely(data->dma_nents == 0)) {
iser_err("dma_map_sg failed!!!\n");
return -EINVAL;
}
if (scsi_prot_sg_count(iser_task->sc)) {
struct iser_data_buf *pdata = &iser_task->prot[iser_dir];
pdata->dma_nents = ib_dma_map_sg(dev, pdata->sg, pdata->size, dma_dir);
if (unlikely(pdata->dma_nents == 0)) {
iser_err("protection dma_map_sg failed!!!\n");
goto out_unmap;
}
}
return 0;
out_unmap:
ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);
return -EINVAL;
}
void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
enum iser_data_dir iser_dir,
enum dma_data_direction dma_dir)
{
struct iser_data_buf *data = &iser_task->data[iser_dir];
struct ib_device *dev;
dev = iser_task->iser_conn->ib_conn.device->ib_device;
ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);
if (scsi_prot_sg_count(iser_task->sc)) {
struct iser_data_buf *pdata = &iser_task->prot[iser_dir];
ib_dma_unmap_sg(dev, pdata->sg, pdata->size, dma_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;
}
void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
enum iser_data_dir cmd_dir)
{
struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
struct iser_fr_desc *desc;
struct ib_mr_status mr_status;
desc = reg->desc;
if (!desc)
return;
/*
* The signature MR cannot be invalidated and reused without checking.
* libiscsi calls the check_protection transport handler only if
* SCSI-Response is received. And the signature MR is not checked if
* the task is completed for some other reason like a timeout or error
* handling. That's why we must check the signature MR here before
* putting it to the free pool.
*/
if (unlikely(desc->sig_protected)) {
desc->sig_protected = false;
ib_check_mr_status(desc->rsc.sig_mr, IB_MR_CHECK_SIG_STATUS,
&mr_status);
}
iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->desc);
reg->desc = 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(scsi_cmd_to_rq(sc));
/*
* 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->sig_mr->need_inval)
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->sig_mr->need_inval = true;
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->need_inval)
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, SZ_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->need_inval = true;
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;
}
int iser_reg_mem_fastreg(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;
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)
return iser_reg_dma(device, mem, reg);
desc = iser_reg_desc_get_fr(ib_conn);
if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) {
err = iser_fast_reg_mr(task, mem, &desc->rsc, 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 = true;
}
reg->desc = desc;
return 0;
err_reg:
iser_reg_desc_put_fr(ib_conn, desc);
return err;
}