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: Chuck Lever <chuck.lever@oracle.com> Acked-by: Doug Ledford <dledford@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Родитель
5a25bfd28c
Коммит
0062818298
|
@ -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;
|
||||
|
|
|
@ -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);
|
||||
|
|
Загрузка…
Ссылка в новой задаче