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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/nes/nes_verbs.c
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@@ -403,7 +403,7 @@ static int nes_set_page(struct ib_mr *ibmr, u64 addr)
}
static int nes_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg,
int sg_nents, unsigned int sg_offset)
int sg_nents, unsigned int *sg_offset)
{
struct nes_mr *nesmr = to_nesmr(ibmr);