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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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include/rdma/rw.h
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@ -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);