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netvsc: change max channel calculation 

The default number of maximum channels should be limited to the
number of cpus available on the numa node of the primary channel.
This also makes sure maximum channels <= num_online_cpus

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-03-22 14:50:59 -07:00 committed by David S. Miller
parent 163891d7d4
commit 3071ada491
2 changed files with 11 additions and 17 deletions
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3
drivers/net/hyperv/netvsc_drv.c
View File

@ -1503,8 +1503,7 @@ static int netvsc_probe(struct hv_device *dev,
/* Notify the netvsc driver of the new device */
memset(&device_info, 0, sizeof(device_info));
device_info.ring_size = ring_size;
device_info.max_num_vrss_chns = min_t(u32, VRSS_CHANNEL_DEFAULT,
num_online_cpus());
device_info.num_chn = VRSS_CHANNEL_DEFAULT;
ret = rndis_filter_device_add(dev, &device_info);
if (ret != 0) {
netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);

25
drivers/net/hyperv/rndis_filter.c
View File

@ -1181,33 +1181,28 @@ int rndis_filter_device_add(struct hv_device *dev,
if (ret || rsscap.num_recv_que < 2)
goto out;
net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, rsscap.num_recv_que);
num_rss_qs = min(device_info->max_num_vrss_chns, net_device->max_chn);
/*
* 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 = cpumask_weight(node_cpu_mask);
num_possible_rss_qs = min_t(u32, cpumask_weight(node_cpu_mask),
rsscap.num_recv_que);
net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
/* We will use the given number of channels if available. */
if (device_info->num_chn && device_info->num_chn < net_device->max_chn)
net_device->num_chn = device_info->num_chn;
else
net_device->num_chn = min(num_possible_rss_qs, num_rss_qs);
num_rss_qs = net_device->num_chn - 1;
net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
for (i = 0; i < ITAB_NUM; i++)
rndis_device->ind_table[i] = ethtool_rxfh_indir_default(i,
net_device->num_chn);
net_device->num_sc_offered = num_rss_qs;
if (net_device->num_chn == 1)
goto out;
num_rss_qs = net_device->num_chn - 1;
if (num_rss_qs == 0)
return 0;
vmbus_set_sc_create_callback(dev->channel, netvsc_sc_open);