Subject: [PATCH 20/34] hv_netvsc: Use the num_online_cpus() for channel limit

From: Haiyang Zhang <[email-masked]>
Date: Mon, 14 May 2018 15:32:08 -0700

[ Commit 25a39f7f975c3c26a0052fbf9b59201c06744332 upstream. ]

Since we no longer localize channel/CPU affiliation within one NUMA
node, num_online_cpus() is used as the number of channel cap, instead of
the number of processors in a NUMA node.

This patch allows a bigger range for tuning the number of channels.

Signed-off-by: Haiyang Zhang <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 drivers/net/hyperv/rndis_filter.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 0c99d9926085..05109ed5377c 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1221,7 +1221,6 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
 	struct ndis_recv_scale_cap rsscap;
 	u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
 	u32 mtu, size;
-	const struct cpumask *node_cpu_mask;
 	u32 num_possible_rss_qs;
 	int i, ret;
 
@@ -1290,14 +1289,8 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
 	if (ret || rsscap.num_recv_que < 2)
 		goto out;
 
-	/*
-	 * We will limit the VRSS channels to the number CPUs in the NUMA node
-	 * the primary channel is currently bound to.
-	 *
-	 * This also guarantees that num_possible_rss_qs <= num_online_cpus
-	 */
-	node_cpu_mask = cpumask_of_node(cpu_to_node(dev->channel->target_cpu));
-	num_possible_rss_qs = min_t(u32, cpumask_weight(node_cpu_mask),
+	/* This guarantees that num_possible_rss_qs <= num_online_cpus */
+	num_possible_rss_qs = min_t(u32, num_online_cpus(),
 				    rsscap.num_recv_que);
 
 	net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
-- 
2.14.3