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net: add busy_poll device feature 

Currently there is no way how to find out if a device supports busy
polling. So add a feature and make it dependent on ndo_busy_poll
existence.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Jiri Pirko 2014-04-02 23:09:31 +02:00 committed by David S. Miller
parent 8e2f1a63f2
commit d0290214de
3 changed files with 10 additions and 0 deletions
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2
include/linux/netdev_features.h
View File

@ -63,6 +63,7 @@ enum {
NETIF_F_HW_VLAN_STAG_RX_BIT, /* Receive VLAN STAG HW acceleration */
NETIF_F_HW_VLAN_STAG_FILTER_BIT,/* Receive filtering on VLAN STAGs */
NETIF_F_HW_L2FW_DOFFLOAD_BIT, /* Allow L2 Forwarding in Hardware */
NETIF_F_BUSY_POLL_BIT, /* Busy poll */
/*
* Add your fresh new feature above and remember to update
@ -118,6 +119,7 @@ enum {
#define NETIF_F_HW_VLAN_STAG_RX __NETIF_F(HW_VLAN_STAG_RX)
#define NETIF_F_HW_VLAN_STAG_TX __NETIF_F(HW_VLAN_STAG_TX)
#define NETIF_F_HW_L2FW_DOFFLOAD __NETIF_F(HW_L2FW_DOFFLOAD)
#define NETIF_F_BUSY_POLL __NETIF_F(BUSY_POLL)
/* Features valid for ethtool to change */
/* = all defined minus driver/device-class-related */

7
net/core/dev.c
View File

@ -5696,6 +5696,13 @@ static netdev_features_t netdev_fix_features(struct net_device *dev,
}
}
#ifdef CONFIG_NET_RX_BUSY_POLL
if (dev->netdev_ops->ndo_busy_poll)
features |= NETIF_F_BUSY_POLL;
else
#endif
features &= ~NETIF_F_BUSY_POLL;
return features;
}

1
net/core/ethtool.c
View File

@ -97,6 +97,7 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
[NETIF_F_RXFCS_BIT] = "rx-fcs",
[NETIF_F_RXALL_BIT] = "rx-all",
[NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
[NETIF_F_BUSY_POLL_BIT] = "busy-poll",
};
static int ethtool_get_features(struct net_device *dev, void __user *useraddr)