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IB/iser: set block queue_virt_boundary 

The block layer can reliably guarantee that SG lists won't
contain gaps (page unaligned) if a driver set the queue
virt_boundary.

With this setting the block layer will:
- refuse merges if bios are not aligned to the virtual boundary
- split bios/requests that are not aligned to the virtual boundary
- or, bounce buffer SG_IOs that are not aligned to the virtual boundary

Since iser is working in 4K page size, set the virt_boundary to
4K pages. With this setting, we can now safely remove the bounce
buffering logic in iser.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sagi Grimberg 2015-10-13 19:12:58 +03:00 committed by Doug Ledford
parent 6c760b3dd5
commit dd0107a089
4 changed files with 18 additions and 326 deletions
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12
drivers/infiniband/ulp/iser/iscsi_iser.c
View File

@ -762,9 +762,7 @@ iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *s
stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
stats->custom_length = 1;
strcpy(stats->custom[0].desc, "fmr_unalign_cnt");
stats->custom[0].value = conn->fmr_unalign_cnt;
stats->custom_length = 0;
}
static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
@ -969,6 +967,13 @@ static umode_t iser_attr_is_visible(int param_type, int param)
return 0;
}
static int iscsi_iser_slave_alloc(struct scsi_device *sdev)
{
blk_queue_virt_boundary(sdev->request_queue, ~MASK_4K);
return 0;
}
static struct scsi_host_template iscsi_iser_sht = {
.module = THIS_MODULE,
.name = "iSCSI Initiator over iSER",
@ -982,6 +987,7 @@ static struct scsi_host_template iscsi_iser_sht = {
.eh_target_reset_handler = iscsi_eh_recover_target,
.target_alloc = iscsi_target_alloc,
.use_clustering = DISABLE_CLUSTERING,
.slave_alloc = iscsi_iser_slave_alloc,
.proc_name = "iscsi_iser",
.this_id = -1,
.track_queue_depth = 1,

7
drivers/infiniband/ulp/iser/iscsi_iser.h
View File

@ -227,18 +227,13 @@ enum iser_data_dir {
* @size: num entries of this sg
* @data_len: total beffer byte len
* @dma_nents: returned by dma_map_sg
* @orig_sg: pointer to the original sg list (in case
* we used a copy)
* @orig_size: num entris of orig sg list
*/
struct iser_data_buf {
struct scatterlist *sg;
unsigned int size;
unsigned long data_len;
unsigned int dma_nents;
struct scatterlist *orig_sg;
unsigned int orig_size;
};
};
/* fwd declarations */
struct iser_device;

51
drivers/infiniband/ulp/iser/iser_initiator.c
View File

@ -661,48 +661,14 @@ void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
{
int is_rdma_data_aligned = 1;
int is_rdma_prot_aligned = 1;
int prot_count = scsi_prot_sg_count(iser_task->sc);
/* if we were reading, copy back to unaligned sglist,
* anyway dma_unmap and free the copy
*/
if (iser_task->data[ISER_DIR_IN].orig_sg) {
is_rdma_data_aligned = 0;
iser_finalize_rdma_unaligned_sg(iser_task,
&iser_task->data[ISER_DIR_IN],
ISER_DIR_IN);
}
if (iser_task->data[ISER_DIR_OUT].orig_sg) {
is_rdma_data_aligned = 0;
iser_finalize_rdma_unaligned_sg(iser_task,
&iser_task->data[ISER_DIR_OUT],
ISER_DIR_OUT);
}
if (iser_task->prot[ISER_DIR_IN].orig_sg) {
is_rdma_prot_aligned = 0;
iser_finalize_rdma_unaligned_sg(iser_task,
&iser_task->prot[ISER_DIR_IN],
ISER_DIR_IN);
}
if (iser_task->prot[ISER_DIR_OUT].orig_sg) {
is_rdma_prot_aligned = 0;
iser_finalize_rdma_unaligned_sg(iser_task,
&iser_task->prot[ISER_DIR_OUT],
ISER_DIR_OUT);
}
if (iser_task->dir[ISER_DIR_IN]) {
iser_unreg_rdma_mem(iser_task, ISER_DIR_IN);
if (is_rdma_data_aligned)
iser_dma_unmap_task_data(iser_task,
&iser_task->data[ISER_DIR_IN],
DMA_FROM_DEVICE);
if (prot_count && is_rdma_prot_aligned)
iser_dma_unmap_task_data(iser_task,
&iser_task->data[ISER_DIR_IN],
DMA_FROM_DEVICE);
if (prot_count)
iser_dma_unmap_task_data(iser_task,
&iser_task->prot[ISER_DIR_IN],
DMA_FROM_DEVICE);
@ -710,11 +676,10 @@ void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
if (iser_task->dir[ISER_DIR_OUT]) {
iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT);
if (is_rdma_data_aligned)
iser_dma_unmap_task_data(iser_task,
&iser_task->data[ISER_DIR_OUT],
DMA_TO_DEVICE);
if (prot_count && is_rdma_prot_aligned)
iser_dma_unmap_task_data(iser_task,
&iser_task->data[ISER_DIR_OUT],
DMA_TO_DEVICE);
if (prot_count)
iser_dma_unmap_task_data(iser_task,
&iser_task->prot[ISER_DIR_OUT],
DMA_TO_DEVICE);

274
drivers/infiniband/ulp/iser/iser_memory.c
View File

@ -88,113 +88,6 @@ int iser_assign_reg_ops(struct iser_device *device)
return 0;
}
static void
iser_free_bounce_sg(struct iser_data_buf *data)
{
struct scatterlist *sg;
int count;
for_each_sg(data->sg, sg, data->size, count)
__free_page(sg_page(sg));
kfree(data->sg);
data->sg = data->orig_sg;
data->size = data->orig_size;
data->orig_sg = NULL;
data->orig_size = 0;
}
static int
iser_alloc_bounce_sg(struct iser_data_buf *data)
{
struct scatterlist *sg;
struct page *page;
unsigned long length = data->data_len;
int i = 0, nents = DIV_ROUND_UP(length, PAGE_SIZE);
sg = kcalloc(nents, sizeof(*sg), GFP_ATOMIC);
if (!sg)
goto err;
sg_init_table(sg, nents);
while (length) {
u32 page_len = min_t(u32, length, PAGE_SIZE);
page = alloc_page(GFP_ATOMIC);
if (!page)
goto err;
sg_set_page(&sg[i], page, page_len, 0);
length -= page_len;
i++;
}
data->orig_sg = data->sg;
data->orig_size = data->size;
data->sg = sg;
data->size = nents;
return 0;
err:
for (; i > 0; i--)
__free_page(sg_page(&sg[i - 1]));
kfree(sg);
return -ENOMEM;
}
static void
iser_copy_bounce(struct iser_data_buf *data, bool to_buffer)
{
struct scatterlist *osg, *bsg = data->sg;
void *oaddr, *baddr;
unsigned int left = data->data_len;
unsigned int bsg_off = 0;
int i;
for_each_sg(data->orig_sg, osg, data->orig_size, i) {
unsigned int copy_len, osg_off = 0;
oaddr = kmap_atomic(sg_page(osg)) + osg->offset;
copy_len = min(left, osg->length);
while (copy_len) {
unsigned int len = min(copy_len, bsg->length - bsg_off);
baddr = kmap_atomic(sg_page(bsg)) + bsg->offset;
if (to_buffer)
memcpy(baddr + bsg_off, oaddr + osg_off, len);
else
memcpy(oaddr + osg_off, baddr + bsg_off, len);
kunmap_atomic(baddr - bsg->offset);
osg_off += len;
bsg_off += len;
copy_len -= len;
if (bsg_off >= bsg->length) {
bsg = sg_next(bsg);
bsg_off = 0;
}
}
kunmap_atomic(oaddr - osg->offset);
left -= osg_off;
}
}
static inline void
iser_copy_from_bounce(struct iser_data_buf *data)
{
iser_copy_bounce(data, false);
}
static inline void
iser_copy_to_bounce(struct iser_data_buf *data)
{
iser_copy_bounce(data, true);
}
struct iser_fr_desc *
iser_reg_desc_get_fr(struct ib_conn *ib_conn)
{
@ -238,62 +131,6 @@ iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
{
}
/**
* iser_start_rdma_unaligned_sg
*/
static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
struct iser_data_buf *data,
enum iser_data_dir cmd_dir)
{
struct ib_device *dev = iser_task->iser_conn->ib_conn.device->ib_device;
int rc;
rc = iser_alloc_bounce_sg(data);
if (rc) {
iser_err("Failed to allocate bounce for data len %lu\n",
data->data_len);
return rc;
}
if (cmd_dir == ISER_DIR_OUT)
iser_copy_to_bounce(data);
data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size,
(cmd_dir == ISER_DIR_OUT) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE);
if (!data->dma_nents) {
iser_err("Got dma_nents %d, something went wrong...\n",
data->dma_nents);
rc = -ENOMEM;
goto err;
}
return 0;
err:
iser_free_bounce_sg(data);
return rc;
}
/**
* iser_finalize_rdma_unaligned_sg
*/
void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
struct iser_data_buf *data,
enum iser_data_dir cmd_dir)
{
struct ib_device *dev = iser_task->iser_conn->ib_conn.device->ib_device;
ib_dma_unmap_sg(dev, data->sg, data->size,
(cmd_dir == ISER_DIR_OUT) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE);
if (cmd_dir == ISER_DIR_IN)
iser_copy_from_bounce(data);
iser_free_bounce_sg(data);
}
#define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & ~MASK_4K) == 0)
/**
@ -355,64 +192,6 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
return cur_page;
}
/**
* iser_data_buf_aligned_len - Tries to determine the maximal correctly aligned
* for RDMA sub-list of a scatter-gather list of memory buffers, and returns
* the number of entries which are aligned correctly. Supports the case where
* consecutive SG elements are actually fragments of the same physcial page.
*/
static int iser_data_buf_aligned_len(struct iser_data_buf *data,
struct ib_device *ibdev,
unsigned sg_tablesize)
{
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 = data->sg;
start_addr = ib_sg_dma_address(ibdev, sgl);
if (unlikely(sgl[0].offset &&
data->data_len >= sg_tablesize * PAGE_SIZE)) {
iser_dbg("can't register length %lx with offset %x "
"fall to bounce buffer\n", data->data_len,
sgl[0].offset);
return 0;
}
for_each_sg(sgl, sg, data->dma_nents, i) {
if (start_check && !IS_4K_ALIGNED(start_addr))
break;
next_sg = sg_next(sg);
if (!next_sg)
break;
end_addr = start_addr + ib_sg_dma_len(ibdev, sg);
start_addr = ib_sg_dma_address(ibdev, next_sg);
if (end_addr == start_addr) {
start_check = 0;
continue;
} else
start_check = 1;
if (!IS_4K_ALIGNED(end_addr))
break;
}
ret_len = (next_sg) ? i : i+1;
if (unlikely(ret_len != data->dma_nents))
iser_warn("rdma alignment violation (%d/%d aligned)\n",
ret_len, data->dma_nents);
return ret_len;
}
static void iser_data_buf_dump(struct iser_data_buf *data,
struct ib_device *ibdev)
{
@ -483,31 +262,6 @@ iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
return 0;
}
static int fall_to_bounce_buf(struct iscsi_iser_task *iser_task,
struct iser_data_buf *mem,
enum iser_data_dir cmd_dir)
{
struct iscsi_conn *iscsi_conn = iser_task->iser_conn->iscsi_conn;
struct iser_device *device = iser_task->iser_conn->ib_conn.device;
iscsi_conn->fmr_unalign_cnt++;
if (iser_debug_level > 0)
iser_data_buf_dump(mem, device->ib_device);
/* unmap the command data before accessing it */
iser_dma_unmap_task_data(iser_task, mem,
(cmd_dir == ISER_DIR_OUT) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE);
/* allocate copy buf, if we are writing, copy the */
/* unaligned scatterlist, dma map the copy */
if (iser_start_rdma_unaligned_sg(iser_task, mem, cmd_dir) != 0)
return -ENOMEM;
return 0;
}
/**
* iser_reg_page_vec - Register physical memory
*
@ -779,26 +533,6 @@ static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
return 0;
}
static int
iser_handle_unaligned_buf(struct iscsi_iser_task *task,
struct iser_data_buf *mem,
enum iser_data_dir dir)
{
struct iser_conn *iser_conn = task->iser_conn;
struct iser_device *device = iser_conn->ib_conn.device;
int err, aligned_len;
aligned_len = iser_data_buf_aligned_len(mem, device->ib_device,
iser_conn->scsi_sg_tablesize);
if (aligned_len != mem->dma_nents) {
err = fall_to_bounce_buf(task, mem, dir);
if (err)
return err;
}
return 0;
}
static int
iser_reg_prot_sg(struct iscsi_iser_task *task,
struct iser_data_buf *mem,
@ -841,10 +575,6 @@ int iser_reg_rdma_mem(struct iscsi_iser_task *task,
bool use_dma_key;
int err;
err = iser_handle_unaligned_buf(task, mem, dir);
if (unlikely(err))
return err;
use_dma_key = (mem->dma_nents == 1 && !iser_always_reg &&
scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL);
@ -867,10 +597,6 @@ int iser_reg_rdma_mem(struct iscsi_iser_task *task,
if (scsi_prot_sg_count(task->sc)) {
mem = &task->prot[dir];
err = iser_handle_unaligned_buf(task, mem, dir);
if (unlikely(err))
goto err_reg;
err = iser_reg_prot_sg(task, mem, desc,
use_dma_key, prot_reg);
if (unlikely(err))