Commit 5e0c03c8 authored by Ben Greear's avatar Ben Greear Committed by Jeff Kirsher
Browse files

net: Support RX-ALL feature flag. 



This flag requests that network devices pass all
received frames up the stack, even ones with errors
such as invalid FCS (frame check sum).  This will
allow sniffers to see bad packets and perhaps
give the user some idea how to fix the problem.

Signed-off-by: default avatarBen Greear <greearb@candelatech.com>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 943146de

Documentation/networking/netdev-features.txt

+7 −0
Original line number Diff line number Diff line
@@ -158,3 +158,10 @@ VLANs. This may be not useful, though.] 
This requests that the NIC append the Ethernet Frame Checksum (FCS)

to the end of the skb data.  This allows sniffers and other tools to

read the CRC recorded by the NIC on receipt of the packet.



*  rx-all



This requests that the NIC receive all possible frames, including errored

frames (such as bad FCS, etc).  This can be helpful when sniffing a link with

bad packets on it.  Some NICs may receive more packets if also put into normal

PROMISC mdoe.

include/linux/netdev_features.h

+2 −0
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ enum { 
	NETIF_F_NOCACHE_COPY_BIT,	/* Use no-cache copyfromuser */

	NETIF_F_LOOPBACK_BIT,		/* Enable loopback */

	NETIF_F_RXFCS_BIT,		/* Append FCS to skb pkt data */

	NETIF_F_RXALL_BIT,		/* Receive errored frames too */



	/*

	 * Add your fresh new feature above and remember to update
@@ -100,6 +101,7 @@ enum { 
#define NETIF_F_UFO		__NETIF_F(UFO)

#define NETIF_F_VLAN_CHALLENGED	__NETIF_F(VLAN_CHALLENGED)

#define NETIF_F_RXFCS		__NETIF_F(RXFCS)

#define NETIF_F_RXALL		__NETIF_F(RXALL)



/* Features valid for ethtool to change */

/* = all defined minus driver/device-class-related */

net/core/ethtool.c

+1 −0
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] 
	[NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",

	[NETIF_F_LOOPBACK_BIT] =         "loopback",

	[NETIF_F_RXFCS_BIT] =            "rx-fcs",

	[NETIF_F_RXALL_BIT] =            "rx-all",

};



static int ethtool_get_features(struct net_device *dev, void __user *useraddr)

CRA Git | Maintained and supported by SUSTech CRA and CCSE