diff options
| author | Roland Dreier <roland@purestorage.com> | 2012-02-14 04:18:17 +0400 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-02-26 02:37:49 +0400 |
| commit | 015487b89f27d91d95a056cdc3c85e6c729bff12 (patch) | |
| tree | 0cecb2acc903154e25abb23e8f345f301fcd1ef5 /include/target | |
| parent | effc6cc8828257c32c37635e737f14fd6e19ecd7 (diff) | |
| download | linux-015487b89f27d91d95a056cdc3c85e6c729bff12.tar.xz | |
target: Untangle front-end and back-end meanings of max_sectors attribute
se_dev_attrib.max_sectors currently has two independent meanings:
- It is reported in the block limits VPD page as the maximum transfer
length, ie the largest IO that the front-end (fabric) can handle.
Also the target core doesn't enforce this maximum transfer length.
- It is used to hold the size of the largest IO that the back-end can
handle, so we know when to split SCSI commands into multiple tasks.
Fix this by adding a new se_dev_attrib.fabric_max_sectors to hold the
maximum transfer length, and checking incoming IOs against that limit.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target')
| -rw-r--r-- | include/target/target_core_base.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 99d7373ef834..1641dea0c282 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -86,6 +86,8 @@ #define DA_UNMAP_GRANULARITY_DEFAULT 0 /* Default unmap_granularity_alignment */ #define DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT 0 +/* Default max transfer length */ +#define DA_FABRIC_MAX_SECTORS 8192 /* Emulation for Direct Page Out */ #define DA_EMULATE_DPO 0 /* Emulation for Forced Unit Access WRITEs */ @@ -726,6 +728,7 @@ struct se_dev_attrib { u32 block_size; u32 hw_max_sectors; u32 max_sectors; + u32 fabric_max_sectors; u32 optimal_sectors; u32 hw_queue_depth; u32 queue_depth; |