From: Sagi Grimberg <sagi@grimberg.me>
Date: Thu, 13 Jul 2017 11:09:41 +0300
Subject: RDMA/core: expose affinity mappings per completion vector
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Patch-mainline: v4.14-rc1
Git-commit: c66cd353bbe6869a059869a7a1518ec619afdc9d
References: bsc#1046306 FATE#322942
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
include/rdma/ib_verbs.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2307,6 +2307,8 @@ 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 {
@@ -3730,4 +3732,26 @@ static inline u16 ib_slid_be16(u32 slid)
{
return cpu_to_be16((u16)slid);
}
+
+/**
+ * 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 */