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Commit d0290214 authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

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: default avatarJiri Pirko <jiri@resnulli.us>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8e2f1a63

include/linux/netdev_features.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

net/core/dev.c

+7 −0
Original line number Diff line number Diff line
@@ -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;

}

net/core/ethtool.c

+1 −0
Original line number Diff line number Diff line
@@ -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)