netdev - [PATCH net-next] hv_netvsc: Use the num_online

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Date:   Fri, 19 Jan 2018 20:35:35 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Haiyang Zhang <haiyangz@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next] hv_netvsc: Use the num_online_cpus() for channel
 limit

From: Haiyang Zhang <haiyangz@...rosoft.com>

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@...rosoft.com>
---
 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 91a67c5297f7..c3ca191fea7f 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);
--
2.15.1