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Commit 00628182 authored by Chuck Lever's avatar Chuck Lever Committed by J. Bruce Fields
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rdma core: Add rdma_rw_mr_payload() 



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: default avatarChuck Lever <chuck.lever@oracle.com>
Acked-by: default avatarDoug Ledford <dledford@redhat.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 5a25bfd2

drivers/infiniband/core/rw.c

+24 −0
Original line number Diff line number Diff line
@@ -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;

include/rdma/rw.h

+2 −0
Original line number Diff line number Diff line
@@ -81,6 +81,8 @@ struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, 
int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,

		struct ib_cqe *cqe, struct ib_send_wr *chain_wr);



unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num,

		unsigned int maxpages);

void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr);

int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr);

void rdma_rw_cleanup_mrs(struct ib_qp *qp);