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IB/core: Enhance ib_map_mr_sg()

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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>
This commit is contained in:
Bart Van Assche
2016-05-12 10:49:15 -07:00
committed by Doug Ledford
parent f83b2561a6
commit 9aa8b3217e
18 changed files with 47 additions and 27 deletions
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8
include/rdma/ib_verbs.h
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@@ -1848,7 +1848,7 @@ struct ib_device {
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 @@ struct net_device *ib_get_net_dev_by_params(struct ib_device *dev, u8 port,
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 @@ ib_map_mr_sg_zbva(struct ib_mr *mr, struct scatterlist *sg, int sg_nents,
}
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);