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[rdma-next,3/3] i40iw: Implement get_vector_affinity API

Message ID 20180302211714.14512-4-shiraz.saleem@intel.com (mailing list archive)
State Accepted
Delegated to: Jason Gunthorpe
Headers show

Commit Message

Saleem, Shiraz March 2, 2018, 9:17 p.m. UTC 
Storage ULPs (like NVMEoF) benefit from exposing affinity mapping
per completion vector to find the optimal multi-queue affinity
assignments. The ULPs call the verbs API ib_get_vector_affinity
introduced in commit c66cd353bbe ("RDMA/core: expose affinity mappings per
completion vector") to get the underlying devices affinity mappings.

Add support in driver to expose the affinity masks per MSI-X
completion vector.

Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
---
 drivers/infiniband/hw/i40iw/i40iw_verbs.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
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Patch

diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.c b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
index 70024e8..a5179857 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
@@ -2729,6 +2729,25 @@  static int i40iw_destroy_ah(struct ib_ah *ah)
 }
 
 /**
+ * i40iw_get_vector_affinity - report IRQ affinity mask
+ * @ibdev: IB device
+ * @comp_vector: completion vector index
+ */
+static const struct cpumask *i40iw_get_vector_affinity(struct ib_device *ibdev,
+						       int comp_vector)
+{
+	struct i40iw_device *iwdev = to_iwdev(ibdev);
+	struct i40iw_msix_vector *msix_vec;
+
+	if (iwdev->msix_shared)
+		msix_vec = &iwdev->iw_msixtbl[comp_vector];
+	else
+		msix_vec = &iwdev->iw_msixtbl[comp_vector + 1];
+
+	return irq_get_affinity_mask(msix_vec->irq);
+}
+
+/**
  * i40iw_init_rdma_device - initialization of iwarp device
  * @iwdev: iwarp device
  */
@@ -2824,6 +2843,7 @@  static struct i40iw_ib_device *i40iw_init_rdma_device(struct i40iw_device *iwdev
 	iwibdev->ibdev.req_notify_cq = i40iw_req_notify_cq;
 	iwibdev->ibdev.post_send = i40iw_post_send;
 	iwibdev->ibdev.post_recv = i40iw_post_recv;
+	iwibdev->ibdev.get_vector_affinity = i40iw_get_vector_affinity;
 
 	return iwibdev;
 }