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Commit c66cd353 authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Doug Ledford
Browse files

RDMA/core: expose affinity mappings per completion vector 



This will allow ULPs to intelligently locate threads based
on completion vector cpu affinity mappings. In case the
driver does not expose a get_vector_affinity callout, return
NULL so the caller can maintain a fallback logic.

Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarHåkon Bugge <haakon.bugge@oracle.com>
Acked-by: default avatarDoug Ledford <dledford@redhat.com>
Signed-off-by: default avatarSagi Grimberg <sagi@grimberg.me>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent a435393a

include/rdma/ib_verbs.h

+24 −0
Original line number Diff line number Diff line
@@ -2296,6 +2296,8 @@ struct ib_device { 
	 */

	int (*get_port_immutable)(struct ib_device *, u8, struct ib_port_immutable *);

	void (*get_dev_fw_str)(struct ib_device *, char *str, size_t str_len);

	const struct cpumask *(*get_vector_affinity)(struct ib_device *ibdev,

						     int comp_vector);

};



struct ib_client {
@@ -3706,4 +3708,26 @@ static inline enum rdma_ah_attr_type rdma_ah_find_type(struct ib_device *dev, 
	else

		return RDMA_AH_ATTR_TYPE_IB;

}



/**

 * ib_get_vector_affinity - Get the affinity mappings of a given completion

 *   vector

 * @device:         the rdma device

 * @comp_vector:    index of completion vector

 *

 * Returns NULL on failure, otherwise a corresponding cpu map of the

 * completion vector (returns all-cpus map if the device driver doesn't

 * implement get_vector_affinity).

 */

static inline const struct cpumask *

ib_get_vector_affinity(struct ib_device *device, int comp_vector)

{

	if (comp_vector < 0 || comp_vector >= device->num_comp_vectors ||

	    !device->get_vector_affinity)

		return NULL;



	return device->get_vector_affinity(device, comp_vector);



}



#endif /* IB_VERBS_H */