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@xxxxxxxxx>
---
drivers/infiniband/hw/i40iw/i40iw_verbs.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
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;
}
--
2.8.3
--
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