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rdma core: Add rdma_rw_mr_payload()

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The amount of payload per MR depends on device capabilities and
the memory registration mode in use. The new rdma_rw API hides both,
making it difficult for ULPs to determine how large their transport
send queues need to be.

Expose the MR payload information via a new API.

Signed-off-by: Chuck Lever <[email protected]>
Acked-by: Doug Ledford <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
This commit is contained in:
Chuck Lever 2017-08-28 15:06:14 -04:00 • committed by J. Bruce Fields
commit 0062818298
2 changed files with 26 additions and 0 deletions
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24
drivers/infiniband/core/rw.c
View file

@ -643,6 +643,30 @@ void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
}
EXPORT_SYMBOL(rdma_rw_ctx_destroy_signature);
/**
* rdma_rw_mr_factor - return number of MRs required for a payload
* @device: device handling the connection
* @port_num: port num to which the connection is bound
* @maxpages: maximum payload pages per rdma_rw_ctx
*
* Returns the number of MRs the device requires to move @maxpayload
* bytes. The returned value is used during transport creation to
* compute max_rdma_ctxts and the size of the transport's Send and
* Send Completion Queues.
*/
unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num,
unsigned int maxpages)
{
unsigned int mr_pages;
if (rdma_rw_can_use_mr(device, port_num))
mr_pages = rdma_rw_fr_page_list_len(device);
else
mr_pages = device->attrs.max_sge_rd;
return DIV_ROUND_UP(maxpages, mr_pages);
}
EXPORT_SYMBOL(rdma_rw_mr_factor);
void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr)
{
u32 factor;