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 <h...@lst.de> Signed-off-by: Sagi Grimberg <s...@grimberg.me> --- include/rdma/ib_verbs.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 0f1813c13687..d44b62791c64 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -2150,6 +2150,8 @@ 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 { @@ -3377,4 +3379,26 @@ void ib_drain_qp(struct ib_qp *qp); int ib_resolve_eth_dmac(struct ib_device *device, struct ib_ah_attr *ah_attr); + +/** + * 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 > device->num_comp_vectors || + !device->get_vector_affinity) + return NULL; + + return device->get_vector_affinity(device, comp_vector); + +} + #endif /* IB_VERBS_H */ -- 2.7.4