ixgbe: Add DCB for 82599, remove BCN support

This patch adds the DCB (Data Center Bridging) support for 82599 hardware.
This is similar to how the 82598 DCB code works.

This patch also removes the BCN (Backwards Congestion Notification) netlink
configuration code from the driver.  BCN was a pre-standard congestion
notification framework, and was not what the IEEE body decided upon for
standard congestion management. QCN (802.1Qau), Quantized Congestion
Notification is the accepted standard, which is not supported by 82599,
hence we remove the support altogether.

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

drivers/net/ixgbe/ixgbe_dcb.c

@@ -31,6 +31,7 @@
 #include "ixgbe_type.h"
 #include "ixgbe_dcb.h"
 #include "ixgbe_dcb_82598.h"
+#include "ixgbe_dcb_82599.h"
 
 /**
  * ixgbe_dcb_config - Struct containing DCB settings.
@@ -215,6 +216,8 @@ s32 ixgbe_dcb_get_tc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats,
 	s32 ret = 0;
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		ret = ixgbe_dcb_get_tc_stats_82598(hw, stats, tc_count);
+	else if (hw->mac.type == ixgbe_mac_82599EB)
+		ret = ixgbe_dcb_get_tc_stats_82599(hw, stats, tc_count);
 	return ret;
 }
 
@@ -232,6 +235,8 @@ s32 ixgbe_dcb_get_pfc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats,
 	s32 ret = 0;
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		ret = ixgbe_dcb_get_pfc_stats_82598(hw, stats, tc_count);
+	else if (hw->mac.type == ixgbe_mac_82599EB)
+		ret = ixgbe_dcb_get_pfc_stats_82599(hw, stats, tc_count);
 	return ret;
 }
 
@@ -248,6 +253,8 @@ s32 ixgbe_dcb_config_rx_arbiter(struct ixgbe_hw *hw,
 	s32 ret = 0;
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		ret = ixgbe_dcb_config_rx_arbiter_82598(hw, dcb_config);
+	else if (hw->mac.type == ixgbe_mac_82599EB)
+		ret = ixgbe_dcb_config_rx_arbiter_82599(hw, dcb_config);
 	return ret;
 }
 
@@ -264,6 +271,8 @@ s32 ixgbe_dcb_config_tx_desc_arbiter(struct ixgbe_hw *hw,
 	s32 ret = 0;
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		ret = ixgbe_dcb_config_tx_desc_arbiter_82598(hw, dcb_config);
+	else if (hw->mac.type == ixgbe_mac_82599EB)
+		ret = ixgbe_dcb_config_tx_desc_arbiter_82599(hw, dcb_config);
 	return ret;
 }
 
@@ -280,6 +289,8 @@ s32 ixgbe_dcb_config_tx_data_arbiter(struct ixgbe_hw *hw,
 	s32 ret = 0;
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		ret = ixgbe_dcb_config_tx_data_arbiter_82598(hw, dcb_config);
+	else if (hw->mac.type == ixgbe_mac_82599EB)
+		ret = ixgbe_dcb_config_tx_data_arbiter_82599(hw, dcb_config);
 	return ret;
 }
 
@@ -296,6 +307,8 @@ s32 ixgbe_dcb_config_pfc(struct ixgbe_hw *hw,
 	s32 ret = 0;
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		ret = ixgbe_dcb_config_pfc_82598(hw, dcb_config);
+	else if (hw->mac.type == ixgbe_mac_82599EB)
+		ret = ixgbe_dcb_config_pfc_82599(hw, dcb_config);
 	return ret;
 }
 
@@ -311,6 +324,8 @@ s32 ixgbe_dcb_config_tc_stats(struct ixgbe_hw *hw)
 	s32 ret = 0;
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		ret = ixgbe_dcb_config_tc_stats_82598(hw);
+	else if (hw->mac.type == ixgbe_mac_82599EB)
+		ret = ixgbe_dcb_config_tc_stats_82599(hw);
 	return ret;
 }
 
@@ -327,6 +342,8 @@ s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw,
 	s32 ret = 0;
 	if (hw->mac.type == ixgbe_mac_82598EB)
 		ret = ixgbe_dcb_hw_config_82598(hw, dcb_config);
+	else if (hw->mac.type == ixgbe_mac_82599EB)
+		ret = ixgbe_dcb_hw_config_82599(hw, dcb_config);
 	return ret;
 }
 

drivers/net/ixgbe/ixgbe_dcb.h

@@ -75,6 +75,26 @@ enum strict_prio_type {
 	prio_link
 };
 
+/* DCB capability definitions */
+#define IXGBE_DCB_PG_SUPPORT        0x00000001
+#define IXGBE_DCB_PFC_SUPPORT       0x00000002
+#define IXGBE_DCB_BCN_SUPPORT       0x00000004
+#define IXGBE_DCB_UP2TC_SUPPORT     0x00000008
+#define IXGBE_DCB_GSP_SUPPORT       0x00000010
+
+#define IXGBE_DCB_8_TC_SUPPORT      0x80
+
+struct dcb_support {
+	/* DCB capabilities */
+	u32 capabilities;
+
+	/* Each bit represents a number of TCs configurable in the hw.
+	 * If 8 traffic classes can be configured, the value is 0x80.
+	 */
+	u8  traffic_classes;
+	u8  pfc_traffic_classes;
+};
+
 /* Traffic class bandwidth allocation per direction */
 struct tc_bw_alloc {
 	u8 bwg_id;		  /* Bandwidth Group (BWG) ID */
@@ -108,38 +128,18 @@ enum dcb_rx_pba_cfg {
 	pba_80_48      /* PBA[0-3] each use 80KB, PBA[4-7] each use 48KB */
 };
 
-/*
- * This structure contains many values encoded as fixed-point
- * numbers, meaning that some of bits are dedicated to the
- * magnitude and others to the fraction part. In the comments
- * this is shown as f=n, where n is the number of fraction bits.
- * These fraction bits are always the low-order bits. The size
- * of the magnitude is not specified.
- */
-struct bcn_config {
-	u32 rp_admin_mode[MAX_TRAFFIC_CLASS]; /* BCN enabled, per TC */
-	u32 bcna_option[2]; /* BCNA Port + MAC Addr */
-	u32 rp_w;        /* Derivative Weight, f=3 */
-	u32 rp_gi;       /* Increase Gain, f=12 */
-	u32 rp_gd;       /* Decrease Gain, f=12 */
-	u32 rp_ru;       /* Rate Unit */
-	u32 rp_alpha;    /* Max Decrease Factor, f=12 */
-	u32 rp_beta;     /* Max Increase Factor, f=12 */
-	u32 rp_ri;       /* Initial Rate */
-	u32 rp_td;       /* Drift Interval Timer */
-	u32 rp_rd;       /* Drift Increase */
-	u32 rp_tmax;     /* Severe Congestion Backoff Timer Range */
-	u32 rp_rmin;     /* Severe Congestion Restart Rate */
-	u32 rp_wrtt;     /* RTT Moving Average Weight */
+struct dcb_num_tcs {
+	u8 pg_tcs;
+	u8 pfc_tcs;
 };
 
 struct ixgbe_dcb_config {
-	struct bcn_config bcn;
-
+	struct dcb_support support;
+	struct dcb_num_tcs num_tcs;
 	struct tc_configuration tc_config[MAX_TRAFFIC_CLASS];
 	u8     bw_percentage[2][MAX_BW_GROUP]; /* One each for Tx/Rx */
-
-	bool  round_robin_enable;
+	bool   pfc_mode_enable;
+	bool   round_robin_enable;
 
 	enum dcb_rx_pba_cfg rx_pba_cfg;