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IB/iser: Generalize fall_to_bounce_buf routine 

Unaligned SG-lists may also happen for protection information.
Generalize bounce buffer routine to handle any iser_data_buf which may
be data and/or protection.

This patch does not change any functionality.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Sagi Grimberg 2014-03-05 19:43:45 +02:00 committed by Roland Dreier
parent 9a8b08fad2
commit 5f588e3d0c
1 changed files with 29 additions and 24 deletions
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51
drivers/infiniband/ulp/iser/iser_memory.c
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@ -45,13 +45,19 @@
* iser_start_rdma_unaligned_sg
*/
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)
{
int dma_nents;
struct ib_device *dev;
struct ib_device *dev = iser_task->iser_conn->ib_conn->device->ib_device;
struct scatterlist *sgl = (struct scatterlist *)data->buf;
struct scatterlist *sg;
char *mem = NULL;
struct iser_data_buf *data = &iser_task->data[cmd_dir];
unsigned long cmd_data_len = data->data_len;
unsigned long cmd_data_len = 0;
int dma_nents, i;
for_each_sg(sgl, sg, data->size, i)
cmd_data_len += ib_sg_dma_len(dev, sg);
if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
mem = (void *)__get_free_pages(GFP_ATOMIC,
@ -61,17 +67,16 @@ static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
if (mem == NULL) {
iser_err("Failed to allocate mem size %d %d for copying sglist\n",
data->size,(int)cmd_data_len);
data->size, (int)cmd_data_len);
return -ENOMEM;
}
if (cmd_dir == ISER_DIR_OUT) {
/* copy the unaligned sg the buffer which is used for RDMA */
struct scatterlist *sgl = (struct scatterlist *)data->buf;
struct scatterlist *sg;
int i;
char *p, *from;
sgl = (struct scatterlist *)data->buf;
p = mem;
for_each_sg(sgl, sg, data->size, i) {
from = kmap_atomic(sg_page(sg));
@ -83,22 +88,19 @@ static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
}
}
sg_init_one(&iser_task->data_copy[cmd_dir].sg_single, mem, cmd_data_len);
iser_task->data_copy[cmd_dir].buf =
&iser_task->data_copy[cmd_dir].sg_single;
iser_task->data_copy[cmd_dir].size = 1;
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;
iser_task->data_copy[cmd_dir].copy_buf = mem;
dev = iser_task->iser_conn->ib_conn->device->ib_device;
dma_nents = ib_dma_map_sg(dev,
&iser_task->data_copy[cmd_dir].sg_single,
1,
dma_nents = ib_dma_map_sg(dev, &data_copy->sg_single, 1,
(cmd_dir == ISER_DIR_OUT) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE);
BUG_ON(dma_nents == 0);
iser_task->data_copy[cmd_dir].dma_nents = dma_nents;
data_copy->dma_nents = dma_nents;
data_copy->data_len = cmd_data_len;
return 0;
}
@ -341,11 +343,12 @@ void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
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)
{
struct iscsi_conn *iscsi_conn = iser_task->iser_conn->iscsi_conn;
struct iser_data_buf *mem = &iser_task->data[cmd_dir];
iscsi_conn->fmr_unalign_cnt++;
iser_warn("rdma alignment violation (%d/%d aligned) or FMR not supported\n",
@ -355,11 +358,11 @@ static int fall_to_bounce_buf(struct iscsi_iser_task *iser_task,
iser_data_buf_dump(mem, ibdev);
/* unmap the command data before accessing it */
iser_dma_unmap_task_data(iser_task, &iser_task->data[cmd_dir]);
iser_dma_unmap_task_data(iser_task, mem);
/* allocate copy buf, if we are writing, copy the */
/* unaligned scatterlist, dma map the copy */
if (iser_start_rdma_unaligned_sg(iser_task, cmd_dir) != 0)
if (iser_start_rdma_unaligned_sg(iser_task, mem, mem_copy, cmd_dir) != 0)
return -ENOMEM;
return 0;
@ -388,7 +391,8 @@ 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,
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");
@ -536,7 +540,8 @@ 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,
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");