summaryrefslogtreecommitdiff
path: root/drivers/net/hyperv
diff options
context:
space:
mode:
authorStephen Hemminger <stephen@networkplumber.org>2018-09-29 14:52:56 +0200
committerDavid S. Miller <davem@davemloft.net>2018-10-02 22:57:34 -0700
commit2a7f8c3b1d3feedee3aa319ac220cbde3725b5d5 (patch)
treeeb0dae451ce25abf6a85426f3cdf5543d7c12dde /drivers/net/hyperv
parentd777f552fcc17b208e63df8b30293e01d9e4971f (diff)
hv_netvsc: remove ndo_poll_controller
Similar to other patches from ERic. As diagnosed by Song Liu, ndo_poll_controller() can be very dangerous on loaded hosts, since the cpu calling ndo_poll_controller() might steal all NAPI contexts (for all RX/TX queues of the NIC). This capture can last for unlimited amount of time, since one cpu is generally not able to drain all the queues under load. In netvsc driver it uses NAPI for TX completions. The default poll_napi will do this for us now and avoid the capture. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Eric Dumazet <edumazet@google.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/hyperv')
-rw-r--r--drivers/net/hyperv/netvsc_drv.c23
1 files changed, 0 insertions, 23 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 005cbaa2fa3b..9bcaf204a7d4 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1565,26 +1565,6 @@ netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)
return -EOPNOTSUPP;
}
-#ifdef CONFIG_NET_POLL_CONTROLLER
-static void netvsc_poll_controller(struct net_device *dev)
-{
- struct net_device_context *ndc = netdev_priv(dev);
- struct netvsc_device *ndev;
- int i;
-
- rcu_read_lock();
- ndev = rcu_dereference(ndc->nvdev);
- if (ndev) {
- for (i = 0; i < ndev->num_chn; i++) {
- struct netvsc_channel *nvchan = &ndev->chan_table[i];
-
- napi_schedule(&nvchan->napi);
- }
- }
- rcu_read_unlock();
-}
-#endif
-
static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
{
return NETVSC_HASH_KEYLEN;
@@ -1812,9 +1792,6 @@ static const struct net_device_ops device_ops = {
.ndo_set_mac_address = netvsc_set_mac_addr,
.ndo_select_queue = netvsc_select_queue,
.ndo_get_stats64 = netvsc_get_stats64,
-#ifdef CONFIG_NET_POLL_CONTROLLER
- .ndo_poll_controller = netvsc_poll_controller,
-#endif
};
/*