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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: Christoph Hellwig <hch@lst.de>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sagi Grimberg 2017-07-13 11:09:41 +03:00 committed by Doug Ledford
parent a435393aca
commit c66cd353bb
1 changed files with 24 additions and 0 deletions
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24
include/rdma/ib_verbs.h
View File

@ -2296,6 +2296,8 @@ struct ib_device {
*/ */
int (*get_port_immutable)(struct ib_device *, u8, struct ib_port_immutable *); 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); 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 { struct ib_client {
@ -3706,4 +3708,26 @@ static inline enum rdma_ah_attr_type rdma_ah_find_type(struct ib_device *dev,
else else
return RDMA_AH_ATTR_TYPE_IB; 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 */ #endif /* IB_VERBS_H */