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Subject[PATCH 4.14 020/165] hv_netvsc: Use the num_online_cpus() for channel limit
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Haiyang Zhang <haiyangz@microsoft.com>

[ 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 <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/hyperv/rndis_filter.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)

--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1221,7 +1221,6 @@ struct netvsc_device *rndis_filter_devic
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_devic
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);

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