[PATCH] RDMA/ipoib: distribute cq completion vector better

Jack Wang
2020-10-13T07:43:46Z

Currently ipoib choose cq completion vector based on port number,
when HCA only have one port, all the interface recv queue completion
are bind to cq completion vector 0.

To better distribute the load, use same method as __ib_alloc_cq_any
to choose completion vector, with the change, each interface now use
different completion vectors.

Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
---
drivers/infiniband/ulp/ipoib/ipoib_verbs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
index 587252fd6f57..5a150a080ac2 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
@@ -158,6 +158,7 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)

int ret, size, req_vec;
int i;
+ static atomic_t counter;

size = ipoib_recvq_size + 1;
ret = ipoib_cm_dev_init(dev);
@@ -171,8 +172,7 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
if (ret != -EOPNOTSUPP)
return ret;

- req_vec = (priv->port - 1) * 2;
-
+ req_vec = atomic_inc_return(&counter) * 2;
cq_attr.cqe = size;
cq_attr.comp_vector = req_vec % priv->ca->num_comp_vectors;
priv->recv_cq = ib_create_cq(priv->ca, ipoib_ib_rx_completion, NULL,
--
2.25.1