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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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2
drivers/infiniband/hw/cxgb4/iw_cxgb4.h
View File

@@ -918,7 +918,7 @@ struct ib_mr *c4iw_alloc_mr(struct ib_pd *pd,
enum ib_mr_type mr_type,
u32 max_num_sg);
int c4iw_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
unsigned int sg_offset);
unsigned int *sg_offset);
int c4iw_dealloc_mw(struct ib_mw *mw);
struct ib_mw *c4iw_alloc_mw(struct ib_pd *pd, enum ib_mw_type type,
struct ib_udata *udata);

2
drivers/infiniband/hw/cxgb4/mem.c
View File

@@ -691,7 +691,7 @@ static int c4iw_set_page(struct ib_mr *ibmr, u64 addr)
}
int c4iw_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
unsigned int sg_offset)
unsigned int *sg_offset)
{
struct c4iw_mr *mhp = to_c4iw_mr(ibmr);