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authorErez Zilber <erezz@voltaire.com>2006-09-11 12:22:30 +0300
committerRoland Dreier <rolandd@cisco.com>2006-09-22 15:22:51 -0700
commit8dfa0876d3dde5f9c1818a4c35caaabc3ddba78b (patch)
treeca68e1f128305185c8cb807e15ab67b36b2be2a5 /drivers/infiniband/ulp/iser/iscsi_iser.h
parent8072ec2f8f6790df91e85d833e672c9c30a7ab3c (diff)
downloadvexpress-lsk-8dfa0876d3dde5f9c1818a4c35caaabc3ddba78b.tar.gz
IB/iser: make FMR "page size" be 4K and not PAGE_SIZE
As iser is able to use at most one rdma operation for the execution of a scsi command, and registration of the sg associated with scsi command has its restrictions, the code checks if an sg is "aligned for rdma". Alignment for rdma is measured in "fmr page" units whose possible resolutions are different between HCAs and can be smaller, equal or bigger to the system page size. When the system page size is bigger than 4KB (eg the default with ia64 kernels) there a bigger chance that an sg would be aligned for rdma if the fmr page size is 4KB. Change the code to create FMR whose pages are of size 4KB and to take that into account when processing the sg. Signed-off-by: Erez Zilber <erezz@voltaire.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/ulp/iser/iscsi_iser.h')
-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
index 3350ba690cf..0ba02abb041 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -82,8 +82,12 @@
__func__ , ## arg); \
} while (0)
+#define SHIFT_4K 12
+#define SIZE_4K (1UL << SHIFT_4K)
+#define MASK_4K (~(SIZE_4K-1))
+
/* support upto 512KB in one RDMA */
-#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> PAGE_SHIFT)
+#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
#define ISCSI_ISER_MAX_LUN 256
#define ISCSI_ISER_MAX_CMD_LEN 16