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authorRoland Dreier <roland@purestorage.com>2012-02-14 04:18:17 +0400
committerNicholas Bellinger <nab@linux-iscsi.org>2012-02-26 02:37:49 +0400
commit015487b89f27d91d95a056cdc3c85e6c729bff12 (patch)
tree0cecb2acc903154e25abb23e8f345f301fcd1ef5 /include/target
parenteffc6cc8828257c32c37635e737f14fd6e19ecd7 (diff)
downloadlinux-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.h3
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;