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IB/core: Improve ib_map_mr_sg() documentation

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Document that ib_map_mr_sg() is able to map physically discontiguous
sg-lists as a single MR. Change IB_MR_TYPE_SG_GAPS_REG into
IB_MR_TYPE_SG_GAPS.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@rimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2016-09-26 09:09:42 -07:00 committed by Doug Ledford
parent fd10ed8e6f
commit 52746129e0
1 changed files with 4 additions and 4 deletions
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8
drivers/infiniband/core/verbs.c
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@ -1811,13 +1811,13 @@ EXPORT_SYMBOL(ib_set_vf_guid);
*
* Constraints:
* - The first sg element is allowed to have an offset.
* - Each sg element must be aligned to page_size (or physically
* contiguous to the previous element). In case an sg element has a
* non contiguous offset, the mapping prefix will not include it.
* - Each sg element must either be aligned to page_size or virtually
* contiguous to the previous element. In case an sg element has a
* non-contiguous offset, the mapping prefix will not include it.
* - The last sg element is allowed to have length less than page_size.
* - If sg_nents total byte length exceeds the mr max_num_sge * page_size
* then only max_num_sg entries will be mapped.
* - If the MR was allocated with type IB_MR_TYPE_SG_GAPS_REG, non of these
* - If the MR was allocated with type IB_MR_TYPE_SG_GAPS, none of these
* constraints holds and the page_size argument is ignored.
*
* Returns the number of sg elements that were mapped to the memory region.