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IB/iser: Remove a redundant struct iser_data_buf

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No need to keep two iser_data_buf structures just in case we use
mem copy. We can avoid that just by adding a pointer to the original
sg. So keep only two iser_data_buf per command (data and protection)
and pass the relevant data_buf to bounce buffer routine.

This patch does not change any functionality.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Adir Lev <adirl@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sagi Grimberg 2015-04-14 18:08:15 +03:00 committed by Doug Ledford
parent ecc3993a2a
commit e3784bd1d9
3 changed files with 34 additions and 52 deletions
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12
drivers/infiniband/ulp/iser/iscsi_iser.h
View File

@ -218,20 +218,23 @@ enum iser_data_dir {
/**
* struct iser_data_buf - iSER data buffer
*
* @buf: pointer to the sg list
* @sg: pointer to the sg list
* @size: num entries of this sg
* @data_len: total beffer byte len
* @dma_nents: returned by dma_map_sg
* @copy_buf: allocated copy buf for SGs unaligned
* for rdma which are copied
* @orig_sg: pointer to the original sg list (in case
* we used a copy)
* @sg_single: SG-ified clone of a non SG SC or
* unaligned SG
*/
struct iser_data_buf {
void *buf;
struct scatterlist *sg;
unsigned int size;
unsigned long data_len;
unsigned int dma_nents;
struct scatterlist *orig_sg;
char *copy_buf;
struct scatterlist sg_single;
};
@ -536,9 +539,7 @@ struct iser_conn {
* @dir: iser data direction
* @rdma_regd: task rdma registration desc
* @data: iser data buffer desc
* @data_copy: iser data copy buffer desc (bounce buffer)
* @prot: iser protection buffer desc
* @prot_copy: iser protection copy buffer desc (bounce buffer)
*/
struct iscsi_iser_task {
struct iser_tx_desc desc;
@ -549,9 +550,7 @@ struct iscsi_iser_task {
int dir[ISER_DIRS_NUM];
struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];
struct iser_data_buf data[ISER_DIRS_NUM];
struct iser_data_buf data_copy[ISER_DIRS_NUM];
struct iser_data_buf prot[ISER_DIRS_NUM];
struct iser_data_buf prot_copy[ISER_DIRS_NUM];
};
struct iser_page_vec {
@ -621,7 +620,6 @@ void iser_free_rx_descriptors(struct iser_conn *iser_conn);
void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
struct iser_data_buf *mem,
struct iser_data_buf *mem_copy,
enum iser_data_dir cmd_dir);
int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task,

16
drivers/infiniband/ulp/iser/iser_initiator.c
View File

@ -401,13 +401,13 @@ int iser_send_command(struct iscsi_conn *conn,
}
if (scsi_sg_count(sc)) { /* using a scatter list */
data_buf->buf = scsi_sglist(sc);
data_buf->sg = scsi_sglist(sc);
data_buf->size = scsi_sg_count(sc);
}
data_buf->data_len = scsi_bufflen(sc);
if (scsi_prot_sg_count(sc)) {
prot_buf->buf = scsi_prot_sglist(sc);
prot_buf->sg = scsi_prot_sglist(sc);
prot_buf->size = scsi_prot_sg_count(sc);
prot_buf->data_len = (data_buf->data_len >>
ilog2(sc->device->sector_size)) * 8;
@ -674,35 +674,31 @@ void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
/* if we were reading, copy back to unaligned sglist,
* anyway dma_unmap and free the copy
*/
if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) {
if (iser_task->data[ISER_DIR_IN].copy_buf) {
is_rdma_data_aligned = 0;
iser_finalize_rdma_unaligned_sg(iser_task,
&iser_task->data[ISER_DIR_IN],
&iser_task->data_copy[ISER_DIR_IN],
ISER_DIR_IN);
}
if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) {
if (iser_task->data[ISER_DIR_OUT].copy_buf) {
is_rdma_data_aligned = 0;
iser_finalize_rdma_unaligned_sg(iser_task,
&iser_task->data[ISER_DIR_OUT],
&iser_task->data_copy[ISER_DIR_OUT],
ISER_DIR_OUT);
}
if (iser_task->prot_copy[ISER_DIR_IN].copy_buf != NULL) {
if (iser_task->prot[ISER_DIR_IN].copy_buf) {
is_rdma_prot_aligned = 0;
iser_finalize_rdma_unaligned_sg(iser_task,
&iser_task->prot[ISER_DIR_IN],
&iser_task->prot_copy[ISER_DIR_IN],
ISER_DIR_IN);
}
if (iser_task->prot_copy[ISER_DIR_OUT].copy_buf != NULL) {
if (iser_task->prot[ISER_DIR_OUT].copy_buf) {
is_rdma_prot_aligned = 0;
iser_finalize_rdma_unaligned_sg(iser_task,
&iser_task->prot[ISER_DIR_OUT],
&iser_task->prot_copy[ISER_DIR_OUT],
ISER_DIR_OUT);
}

58
drivers/infiniband/ulp/iser/iser_memory.c
View File

@ -46,11 +46,10 @@
*/
static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
struct iser_data_buf *data,
struct iser_data_buf *data_copy,
enum iser_data_dir cmd_dir)
{
struct ib_device *dev = iser_task->iser_conn->ib_conn.device->ib_device;
struct scatterlist *sgl = (struct scatterlist *)data->buf;
struct scatterlist *sgl = data->sg;
struct scatterlist *sg;
char *mem = NULL;
unsigned long cmd_data_len = data->data_len;
@ -72,7 +71,7 @@ static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
/* copy the unaligned sg the buffer which is used for RDMA */
char *p, *from;
sgl = (struct scatterlist *)data->buf;
sgl = data->sg;
p = mem;
for_each_sg(sgl, sg, data->size, i) {
from = kmap_atomic(sg_page(sg));
@ -84,18 +83,16 @@ static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
}
}
sg_init_one(&data_copy->sg_single, mem, cmd_data_len);
data_copy->buf = &data_copy->sg_single;
data_copy->size = 1;
data_copy->copy_buf = mem;
dma_nents = ib_dma_map_sg(dev, &data_copy->sg_single, 1,
sg_init_one(&data->sg_single, mem, cmd_data_len);
data->orig_sg = data->sg;
data->sg = &data->sg_single;
data->copy_buf = mem;
dma_nents = ib_dma_map_sg(dev, data->sg, 1,
(cmd_dir == ISER_DIR_OUT) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE);
BUG_ON(dma_nents == 0);
data_copy->dma_nents = dma_nents;
data_copy->data_len = cmd_data_len;
data->dma_nents = dma_nents;
return 0;
}
@ -106,7 +103,6 @@ static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
struct iser_data_buf *data,
struct iser_data_buf *data_copy,
enum iser_data_dir cmd_dir)
{
struct ib_device *dev;
@ -114,7 +110,7 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
dev = iser_task->iser_conn->ib_conn.device->ib_device;
ib_dma_unmap_sg(dev, &data_copy->sg_single, 1,
ib_dma_unmap_sg(dev, data->sg, 1,
(cmd_dir == ISER_DIR_OUT) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE);
@ -126,9 +122,9 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
int i;
/* copy back read RDMA to unaligned sg */
mem = data_copy->copy_buf;
mem = data->copy_buf;
sgl = (struct scatterlist *)data->buf;
sgl = data->sg;
sg_size = data->size;
p = mem;
@ -145,12 +141,12 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
cmd_data_len = data->data_len;
if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
free_pages((unsigned long)data_copy->copy_buf,
free_pages((unsigned long)data->copy_buf,
ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
else
kfree(data_copy->copy_buf);
kfree(data->copy_buf);
data_copy->copy_buf = NULL;
data->copy_buf = NULL;
}
#define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & ~MASK_4K) == 0)
@ -172,7 +168,7 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
struct ib_device *ibdev, u64 *pages,
int *offset, int *data_size)
{
struct scatterlist *sg, *sgl = (struct scatterlist *)data->buf;
struct scatterlist *sg, *sgl = data->sg;
u64 start_addr, end_addr, page, chunk_start = 0;
unsigned long total_sz = 0;
unsigned int dma_len;
@ -224,14 +220,14 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
static int iser_data_buf_aligned_len(struct iser_data_buf *data,
struct ib_device *ibdev)
{
struct scatterlist *sgl, *sg, *next_sg = NULL;
struct scatterlist *sg, *sgl, *next_sg = NULL;
u64 start_addr, end_addr;
int i, ret_len, start_check = 0;
if (data->dma_nents == 1)
return 1;
sgl = (struct scatterlist *)data->buf;
sgl = data->sg;
start_addr = ib_sg_dma_address(ibdev, sgl);
for_each_sg(sgl, sg, data->dma_nents, i) {
@ -263,11 +259,10 @@ static int iser_data_buf_aligned_len(struct iser_data_buf *data,
static void iser_data_buf_dump(struct iser_data_buf *data,
struct ib_device *ibdev)
{
struct scatterlist *sgl = (struct scatterlist *)data->buf;
struct scatterlist *sg;
int i;
for_each_sg(sgl, sg, data->dma_nents, 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)ib_sg_dma_address(ibdev, sg),
@ -320,7 +315,7 @@ int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
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->buf, data->size, dma_dir);
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;
@ -335,13 +330,12 @@ void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
struct ib_device *dev;
dev = iser_task->iser_conn->ib_conn.device->ib_device;
ib_dma_unmap_sg(dev, data->buf, data->size, dir);
ib_dma_unmap_sg(dev, data->sg, data->size, dir);
}
static int fall_to_bounce_buf(struct iscsi_iser_task *iser_task,
struct ib_device *ibdev,
struct iser_data_buf *mem,
struct iser_data_buf *mem_copy,
enum iser_data_dir cmd_dir,
int aligned_len)
{
@ -361,7 +355,7 @@ static int fall_to_bounce_buf(struct iscsi_iser_task *iser_task,
/* allocate copy buf, if we are writing, copy the */
/* unaligned scatterlist, dma map the copy */
if (iser_start_rdma_unaligned_sg(iser_task, mem, mem_copy, cmd_dir) != 0)
if (iser_start_rdma_unaligned_sg(iser_task, mem, cmd_dir) != 0)
return -ENOMEM;
return 0;
@ -391,18 +385,16 @@ int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *iser_task,
aligned_len = iser_data_buf_aligned_len(mem, ibdev);
if (aligned_len != mem->dma_nents) {
err = fall_to_bounce_buf(iser_task, ibdev, mem,
&iser_task->data_copy[cmd_dir],
cmd_dir, aligned_len);
if (err) {
iser_err("failed to allocate bounce buffer\n");
return err;
}
mem = &iser_task->data_copy[cmd_dir];
}
/* if there a single dma entry, FMR is not needed */
if (mem->dma_nents == 1) {
sg = (struct scatterlist *)mem->buf;
sg = mem->sg;
regd_buf->reg.lkey = device->mr->lkey;
regd_buf->reg.rkey = device->mr->rkey;
@ -592,7 +584,7 @@ static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
/* if there a single dma entry, dma mr suffices */
if (mem->dma_nents == 1) {
struct scatterlist *sg = (struct scatterlist *)mem->buf;
struct scatterlist *sg = mem->sg;
sge->lkey = device->mr->lkey;
sge->addr = ib_sg_dma_address(ibdev, &sg[0]);
@ -678,13 +670,11 @@ int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *iser_task,
aligned_len = iser_data_buf_aligned_len(mem, ibdev);
if (aligned_len != mem->dma_nents) {
err = fall_to_bounce_buf(iser_task, ibdev, mem,
&iser_task->data_copy[cmd_dir],
cmd_dir, aligned_len);
if (err) {
iser_err("failed to allocate bounce buffer\n");
return err;
}
mem = &iser_task->data_copy[cmd_dir];
}
if (mem->dma_nents != 1 ||
@ -711,13 +701,11 @@ int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *iser_task,
aligned_len = iser_data_buf_aligned_len(mem, ibdev);
if (aligned_len != mem->dma_nents) {
err = fall_to_bounce_buf(iser_task, ibdev, mem,
&iser_task->prot_copy[cmd_dir],
cmd_dir, aligned_len);
if (err) {
iser_err("failed to allocate bounce buffer\n");
return err;
}
mem = &iser_task->prot_copy[cmd_dir];
}
err = iser_fast_reg_mr(iser_task, regd_buf, mem,