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authorSagi Grimberg <sagi@grimberg.me>2017-07-13 11:09:41 +0300
committerDoug Ledford <dledford@redhat.com>2017-08-08 14:55:56 -0400
commitc66cd353bbe6869a059869a7a1518ec619afdc9d (patch)
treef844baddad2b6a32100953f95378b4095011115b /include
parenta435393acafbf0ecff4deb3e3cb554b34f0d0664 (diff)
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: HÃ¥kon 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>
Diffstat (limited to 'include')
-rw-r--r--include/rdma/ib_verbs.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index b5732432bb29..73ed2e4e802f 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -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 */

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