DCB: Add interface to query for the DCB capabilities of an device.

Adds to the netlink interface for Data Center Bridging (DCB), allowing
the DCB capabilities supported by a device to be queried.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 38 insertions, 0 deletions

diff --git a/include/linux/dcbnl.h b/include/linux/dcbnl.h
index 32d32c1ee410..13f0c638a695 100644
--- a/include/linux/dcbnl.h
+++ b/include/linux/dcbnl.h
@@ -43,6 +43,7 @@ struct dcbmsg {
  * @DCB_CMD_SET_ALL: apply all changes to the underlying device
  * @DCB_CMD_GPERM_HWADDR: get the permanent MAC address of the underlying
  *                        device.  Only useful when using bonding.
+ * @DCB_CMD_GCAP: request the DCB capabilities of the device
  */
 enum dcbnl_commands {
         DCB_CMD_UNDEFINED,
@@ -60,6 +61,7 @@ enum dcbnl_commands {
 
         DCB_CMD_SET_ALL,
         DCB_CMD_GPERM_HWADDR,
+        DCB_CMD_GCAP,
 
         __DCB_CMD_ENUM_MAX,
         DCB_CMD_MAX = __DCB_CMD_ENUM_MAX - 1,
@@ -78,6 +80,7 @@ enum dcbnl_commands {
  * @DCB_ATTR_PG_CFG: priority group configuration (NLA_NESTED)
  * @DCB_ATTR_SET_ALL: bool to commit changes to hardware or not (NLA_U8)
  * @DCB_ATTR_PERM_HWADDR: MAC address of the physical device (NLA_NESTED)
+ * @DCB_ATTR_CAP: DCB capabilities of the device (NLA_NESTED)
  */
 enum dcbnl_attrs {
         DCB_ATTR_UNDEFINED,
@@ -90,6 +93,7 @@ enum dcbnl_attrs {
         DCB_ATTR_PG_CFG,
         DCB_ATTR_SET_ALL,
         DCB_ATTR_PERM_HWADDR,
+        DCB_ATTR_CAP,
 
         __DCB_ATTR_ENUM_MAX,
         DCB_ATTR_MAX = __DCB_ATTR_ENUM_MAX - 1,
@@ -217,6 +221,39 @@ enum dcbnl_tc_attrs {
 };
 
 /**
+ * enum dcbnl_cap_attrs - DCB Capability attributes
+ *
+ * @DCB_CAP_ATTR_UNDEFINED: unspecified attribute to catch errors
+ * @DCB_CAP_ATTR_ALL: (NLA_FLAG) all capability parameters
+ * @DCB_CAP_ATTR_PG: (NLA_U8) device supports Priority Groups
+ * @DCB_CAP_ATTR_PFC: (NLA_U8) device supports Priority Flow Control
+ * @DCB_CAP_ATTR_UP2TC: (NLA_U8) device supports user priority to
+ *                               traffic class mapping
+ * @DCB_CAP_ATTR_PG_TCS: (NLA_U8) bitmap where each bit represents a
+ *                                number of traffic classes the device
+ *                                can be configured to use for Priority Groups
+ * @DCB_CAP_ATTR_PFC_TCS: (NLA_U8) bitmap where each bit represents a
+ *                                 number of traffic classes the device can be
+ *                                 configured to use for Priority Flow Control
+ * @DCB_CAP_ATTR_GSP: (NLA_U8) device supports group strict priority
+ * @DCB_CAP_ATTR_BCN: (NLA_U8) device supports Backwards Congestion
+ *                             Notification
+ */
+enum dcbnl_cap_attrs {
+        DCB_CAP_ATTR_UNDEFINED,
+        DCB_CAP_ATTR_ALL,
+        DCB_CAP_ATTR_PG,
+        DCB_CAP_ATTR_PFC,
+        DCB_CAP_ATTR_UP2TC,
+        DCB_CAP_ATTR_PG_TCS,
+        DCB_CAP_ATTR_PFC_TCS,
+        DCB_CAP_ATTR_GSP,
+        DCB_CAP_ATTR_BCN,
+
+        __DCB_CAP_ATTR_ENUM_MAX,
+        DCB_CAP_ATTR_MAX = __DCB_CAP_ATTR_ENUM_MAX - 1,
+};
+/**
  * enum dcb_general_attr_values - general DCB attribute values
  *
  * @DCB_ATTR_UNDEFINED: value used to indicate an attribute is not supported
diff --git a/include/net/dcbnl.h b/include/net/dcbnl.h
index 0ef0c5a46d8b..183ed040cf4c 100644
--- a/include/net/dcbnl.h
+++ b/include/net/dcbnl.h
@@ -39,6 +39,7 @@ struct dcbnl_rtnl_ops {
         void (*setpfccfg)(struct net_device *, int, u8);
         void (*getpfccfg)(struct net_device *, int, u8 *);
         u8   (*setall)(struct net_device *);
+        u8   (*getcap)(struct net_device *, int, u8 *);
 };
 
 #endif /* __NET_DCBNL_H__ */