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: Ben Greear <greearb@candelatech.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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: Ben Greear <greearb@candelatech.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Ben Greear · Jeff Kirsher
1 parent 943146de22
Showing 3 changed files with 10 additions and 0 deletions Side-by-side Diff
Documentation/networking/netdev-features.txt
include/linux/netdev_features.h
net/core/ethtool.c
@@ -158,4 +158,11 @@
 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.
@@ -55,6 +55,7 @@
 	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 @@
 #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 */
@@ -74,6 +74,7 @@
 	[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)
...	...	@@ -158,4 +158,11 @@
158	158	This requests that the NIC append the Ethernet Frame Checksum (FCS)
159	159	to the end of the skb data. This allows sniffers and other tools to
160	160	read the CRC recorded by the NIC on receipt of the packet.
	161	+
	162	+* rx-all
	163	+
	164	+This requests that the NIC receive all possible frames, including errored
	165	+frames (such as bad FCS, etc). This can be helpful when sniffing a link with
	166	+bad packets on it. Some NICs may receive more packets if also put into normal
	167	+PROMISC mdoe.
...	...	@@ -55,6 +55,7 @@
55	55	NETIF_F_NOCACHE_COPY_BIT, /* Use no-cache copyfromuser */
56	56	NETIF_F_LOOPBACK_BIT, /* Enable loopback */
57	57	NETIF_F_RXFCS_BIT, /* Append FCS to skb pkt data */
	58	+ NETIF_F_RXALL_BIT, /* Receive errored frames too */
58	59
59	60	/*
60	61	* Add your fresh new feature above and remember to update
...	...	@@ -100,6 +101,7 @@
100	101	#define NETIF_F_UFO __NETIF_F(UFO)
101	102	#define NETIF_F_VLAN_CHALLENGED __NETIF_F(VLAN_CHALLENGED)
102	103	#define NETIF_F_RXFCS __NETIF_F(RXFCS)
	104	+#define NETIF_F_RXALL __NETIF_F(RXALL)
103	105
104	106	/* Features valid for ethtool to change */
105	107	/* = all defined minus driver/device-class-related */
...	...	@@ -74,6 +74,7 @@
74	74	[NETIF_F_NOCACHE_COPY_BIT] = "tx-nocache-copy",
75	75	[NETIF_F_LOOPBACK_BIT] = "loopback",
76	76	[NETIF_F_RXFCS_BIT] = "rx-fcs",
	77	+ [NETIF_F_RXALL_BIT] = "rx-all",
77	78	};
78	79
79	80	static int ethtool_get_features(struct net_device dev, void __user useraddr)