DCB: Add support for DCB BCN

Adds an interface to configure the Backward Congestion Notification
(BCN) feature.  In a BCN capabale network, congestion notifications
from congested points out in the network can cause the end station
limit the rate of a given traffic flow.

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, 47 insertions, 1 deletions

diff --git a/include/linux/dcbnl.h b/include/linux/dcbnl.h
index 6cc4560bc376..e73a61449ad6 100644
--- a/include/linux/dcbnl.h
+++ b/include/linux/dcbnl.h
@@ -46,6 +46,8 @@ struct dcbmsg {
  * @DCB_CMD_GCAP: request the DCB capabilities of the device
  * @DCB_CMD_GNUMTCS: get the number of traffic classes currently supported
  * @DCB_CMD_SNUMTCS: set the number of traffic classes
+ * @DCB_CMD_GBCN: set backward congestion notification configuration
+ * @DCB_CMD_SBCN: get backward congestion notification configration.
  */
 enum dcbnl_commands {
         DCB_CMD_UNDEFINED,
@@ -62,18 +64,24 @@ enum dcbnl_commands {
         DCB_CMD_PFC_SCFG,
 
         DCB_CMD_SET_ALL,
+
         DCB_CMD_GPERM_HWADDR,
+
         DCB_CMD_GCAP,
+
         DCB_CMD_GNUMTCS,
         DCB_CMD_SNUMTCS,
+
         DCB_CMD_PFC_GSTATE,
         DCB_CMD_PFC_SSTATE,
 
+        DCB_CMD_BCN_GCFG,
+        DCB_CMD_BCN_SCFG,
+
         __DCB_CMD_ENUM_MAX,
         DCB_CMD_MAX = __DCB_CMD_ENUM_MAX - 1,
 };
 
-
 /**
  * enum dcbnl_attrs - DCB top-level netlink attributes
  *
@@ -88,6 +96,7 @@ enum dcbnl_commands {
  * @DCB_ATTR_PERM_HWADDR: MAC address of the physical device (NLA_NESTED)
  * @DCB_ATTR_CAP: DCB capabilities of the device (NLA_NESTED)
  * @DCB_ATTR_NUMTCS: number of traffic classes supported (NLA_NESTED)
+ * @DCB_ATTR_BCN: backward congestion notification configuration (NLA_NESTED)
  */
 enum dcbnl_attrs {
         DCB_ATTR_UNDEFINED,
@@ -102,6 +111,7 @@ enum dcbnl_attrs {
         DCB_ATTR_PERM_HWADDR,
         DCB_ATTR_CAP,
         DCB_ATTR_NUMTCS,
+        DCB_ATTR_BCN,
 
         __DCB_ATTR_ENUM_MAX,
         DCB_ATTR_MAX = __DCB_ATTR_ENUM_MAX - 1,
@@ -282,6 +292,38 @@ enum dcbnl_numtcs_attrs {
         DCB_NUMTCS_ATTR_MAX = __DCB_NUMTCS_ATTR_ENUM_MAX - 1,
 };
 
+enum dcbnl_bcn_attrs{
+        DCB_BCN_ATTR_UNDEFINED = 0,
+
+        DCB_BCN_ATTR_RP_0,
+        DCB_BCN_ATTR_RP_1,
+        DCB_BCN_ATTR_RP_2,
+        DCB_BCN_ATTR_RP_3,
+        DCB_BCN_ATTR_RP_4,
+        DCB_BCN_ATTR_RP_5,
+        DCB_BCN_ATTR_RP_6,
+        DCB_BCN_ATTR_RP_7,
+        DCB_BCN_ATTR_RP_ALL,
+
+        DCB_BCN_ATTR_ALPHA,
+        DCB_BCN_ATTR_BETA,
+        DCB_BCN_ATTR_GD,
+        DCB_BCN_ATTR_GI,
+        DCB_BCN_ATTR_TMAX,
+        DCB_BCN_ATTR_TD,
+        DCB_BCN_ATTR_RMIN,
+        DCB_BCN_ATTR_W,
+        DCB_BCN_ATTR_RD,
+        DCB_BCN_ATTR_RU,
+        DCB_BCN_ATTR_WRTT,
+        DCB_BCN_ATTR_RI,
+        DCB_BCN_ATTR_C,
+        DCB_BCN_ATTR_ALL,
+
+        __DCB_BCN_ATTR_ENUM_MAX,
+        DCB_BCN_ATTR_MAX = __DCB_BCN_ATTR_ENUM_MAX - 1,
+};
+
 /**
  * enum dcb_general_attr_values - general DCB attribute values
  *
diff --git a/include/net/dcbnl.h b/include/net/dcbnl.h
index c7d87caf3f99..91e0a3d7faf2 100644
--- a/include/net/dcbnl.h
+++ b/include/net/dcbnl.h
@@ -44,6 +44,10 @@ struct dcbnl_rtnl_ops {
         u8   (*setnumtcs)(struct net_device *, int, u8);
         u8   (*getpfcstate)(struct net_device *);
         void (*setpfcstate)(struct net_device *, u8);
+        void (*getbcncfg)(struct net_device *, int, u32 *);
+        void (*setbcncfg)(struct net_device *, int, u32);
+        void (*getbcnrp)(struct net_device *, int, u8 *);
+        void (*setbcnrp)(struct net_device *, int, u8);
 };
 
 #endif /* __NET_DCBNL_H__ */