IB: Refactor umem to use linear SG table
This patch refactors the IB core umem code and vendor drivers to use a
linear (chained) SG table instead of chunk list. With this change the
relevant code becomes clearer—no need for nested loops to build and
use umem.
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
index 9ee0d2e..1ea0b65 100644
--- a/include/rdma/ib_umem.h
+++ b/include/rdma/ib_umem.h
@@ -46,17 +46,12 @@
int page_size;
int writable;
int hugetlb;
- struct list_head chunk_list;
struct work_struct work;
struct mm_struct *mm;
unsigned long diff;
-};
-
-struct ib_umem_chunk {
- struct list_head list;
- int nents;
- int nmap;
- struct scatterlist page_list[0];
+ struct sg_table sg_head;
+ int nmap;
+ int npages;
};
#ifdef CONFIG_INFINIBAND_USER_MEM