net: ethool: Document struct ethtool_flow_ext
Add documentation for struct ethtool_flow_ext especially in regard
to what flags are needed for which fields.
Signed-off-by: Yan Burman <yanb@mellanox.com>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index be8c41e..0c9b448 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -503,9 +503,20 @@
__u8 hdata[52];
};
+/**
+ * struct ethtool_flow_ext - additional RX flow fields
+ * @h_dest: destination MAC address
+ * @vlan_etype: VLAN EtherType
+ * @vlan_tci: VLAN tag control information
+ * @data: user defined data
+ *
+ * Note, @vlan_etype, @vlan_tci, and @data are only valid if %FLOW_EXT
+ * is set in &struct ethtool_rx_flow_spec @flow_type.
+ * @h_dest is valid if %FLOW_MAC_EXT is set.
+ */
struct ethtool_flow_ext {
__u8 padding[2];
- unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
+ unsigned char h_dest[ETH_ALEN];
__be16 vlan_etype;
__be16 vlan_tci;
__be32 data[2];
@@ -519,7 +530,8 @@
* @m_u: Masks for flow field bits to be matched
* @m_ext: Masks for additional field bits to be matched
* Note, all additional fields must be ignored unless @flow_type
- * includes the %FLOW_EXT flag.
+ * includes the %FLOW_EXT or %FLOW_MAC_EXT flag
+ * (see &struct ethtool_flow_ext description).
* @ring_cookie: RX ring/queue index to deliver to, or %RX_CLS_FLOW_DISC
* if packets should be discarded
* @location: Location of rule in the table. Locations must be