IB/core: Enhance ib_map_mr_sg()
The SRP initiator allows to set max_sectors to a value that exceeds
the largest amount of data that can be mapped at once with an mlx4
HCA using fast registration and a page size of 4 KB. Hence modify
ib_map_mr_sg() such that it can map partial sg-elements. If an
sg-element has been mapped partially, let the caller know
which fraction has been mapped by adjusting *sg_offset.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Tested-by: Laurence Oberman <loberman@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 544c55b..56bb0f3 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1848,7 +1848,7 @@
int (*map_mr_sg)(struct ib_mr *mr,
struct scatterlist *sg,
int sg_nents,
- unsigned sg_offset);
+ unsigned int *sg_offset);
struct ib_mw * (*alloc_mw)(struct ib_pd *pd,
enum ib_mw_type type,
struct ib_udata *udata);
@@ -3145,11 +3145,11 @@
const struct sockaddr *addr);
int ib_map_mr_sg(struct ib_mr *mr, struct scatterlist *sg, int sg_nents,
- unsigned int sg_offset, unsigned int page_size);
+ unsigned int *sg_offset, unsigned int page_size);
static inline int
ib_map_mr_sg_zbva(struct ib_mr *mr, struct scatterlist *sg, int sg_nents,
- unsigned int sg_offset, unsigned int page_size)
+ unsigned int *sg_offset, unsigned int page_size)
{
int n;
@@ -3160,7 +3160,7 @@
}
int ib_sg_to_pages(struct ib_mr *mr, struct scatterlist *sgl, int sg_nents,
- unsigned int sg_offset, int (*set_page)(struct ib_mr *, u64));
+ unsigned int *sg_offset, int (*set_page)(struct ib_mr *, u64));
void ib_drain_rq(struct ib_qp *qp);
void ib_drain_sq(struct ib_qp *qp);