392 lines
11 KiB
C
392 lines
11 KiB
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/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->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, 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_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;
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|