ixgbe: consolidate packet buffer allocation

Consolidate packet buffer allocation currently being
done in the DCB path and main path. This allows the
feature set and packet buffer requirements to be done
once.

This is prep work to allow DCB to coexist with other
features namely, flow director.

CC: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: NJohn Fastabend <john.r.fastabend@intel.com>
Tested-by: NRoss Brattain <ross.b.brattain@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ixgbe/ixgbe_82598.c

@@ -1242,6 +1242,47 @@ static void ixgbe_set_lan_id_multi_port_pcie_82598(struct ixgbe_hw *hw)
 	}
 }
 
+/**
+ * ixgbe_set_rxpba_82598 - Configure packet buffers
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure packet buffers.
+ */
+static void ixgbe_set_rxpba_82598(struct ixgbe_hw *hw, int num_pb, u32 headroom,
+				  int strategy)
+{
+	u32 rxpktsize = IXGBE_RXPBSIZE_64KB;
+	u8  i = 0;
+
+	if (!num_pb)
+		return;
+
+	/* Setup Rx packet buffer sizes */
+	switch (strategy) {
+	case PBA_STRATEGY_WEIGHTED:
+		/* Setup the first four at 80KB */
+		rxpktsize = IXGBE_RXPBSIZE_80KB;
+		for (; i < 4; i++)
+			IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize);
+		/* Setup the last four at 48KB...don't re-init i */
+		rxpktsize = IXGBE_RXPBSIZE_48KB;
+		/* Fall Through */
+	case PBA_STRATEGY_EQUAL:
+	default:
+		/* Divide the remaining Rx packet buffer evenly among the TCs */
+		for (; i < IXGBE_MAX_PACKET_BUFFERS; i++)
+			IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize);
+		break;
+	}
+
+	/* Setup Tx packet buffer sizes */
+	for (i = 0; i < IXGBE_MAX_PACKET_BUFFERS; i++)
+		IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), IXGBE_TXPBSIZE_40KB);
+
+	return;
+}
+
 static struct ixgbe_mac_operations mac_ops_82598 = {
 	.init_hw		= &ixgbe_init_hw_generic,
 	.reset_hw		= &ixgbe_reset_hw_82598,
@@ -1257,6 +1298,7 @@ static struct ixgbe_mac_operations mac_ops_82598 = {
 	.read_analog_reg8	= &ixgbe_read_analog_reg8_82598,
 	.write_analog_reg8	= &ixgbe_write_analog_reg8_82598,
 	.setup_link		= &ixgbe_setup_mac_link_82598,
+	.set_rxpba		= &ixgbe_set_rxpba_82598,
 	.check_link		= &ixgbe_check_mac_link_82598,
 	.get_link_capabilities	= &ixgbe_get_link_capabilities_82598,
 	.led_on			= &ixgbe_led_on_generic,

drivers/net/ixgbe/ixgbe_82599.c

@@ -1114,27 +1114,8 @@ s32 ixgbe_reinit_fdir_tables_82599(struct ixgbe_hw *hw)
 s32 ixgbe_init_fdir_signature_82599(struct ixgbe_hw *hw, u32 pballoc)
 {
 	u32 fdirctrl = 0;
-	u32 pbsize;
 	int i;
 
-	/*
-	 * Before enabling Flow Director, the Rx Packet Buffer size
-	 * must be reduced.  The new value is the current size minus
-	 * flow director memory usage size.
-	 */
-	pbsize = (1 << (IXGBE_FDIR_PBALLOC_SIZE_SHIFT + pballoc));
-	IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(0),
-	    (IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(0)) - pbsize));
-
-	/*
-	 * The defaults in the HW for RX PB 1-7 are not zero and so should be
-	 * initialized to zero for non DCB mode otherwise actual total RX PB
-	 * would be bigger than programmed and filter space would run into
-	 * the PB 0 region.
-	 */
-	for (i = 1; i < 8; i++)
-		IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), 0);
-
 	/* Send interrupt when 64 filters are left */
 	fdirctrl |= 4 << IXGBE_FDIRCTRL_FULL_THRESH_SHIFT;
 
@@ -1202,27 +1183,8 @@ s32 ixgbe_init_fdir_signature_82599(struct ixgbe_hw *hw, u32 pballoc)
 s32 ixgbe_init_fdir_perfect_82599(struct ixgbe_hw *hw, u32 pballoc)
 {
 	u32 fdirctrl = 0;
-	u32 pbsize;
 	int i;
 
-	/*
-	 * Before enabling Flow Director, the Rx Packet Buffer size
-	 * must be reduced.  The new value is the current size minus
-	 * flow director memory usage size.
-	 */
-	pbsize = (1 << (IXGBE_FDIR_PBALLOC_SIZE_SHIFT + pballoc));
-	IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(0),
-	    (IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(0)) - pbsize));
-
-	/*
-	 * The defaults in the HW for RX PB 1-7 are not zero and so should be
-	 * initialized to zero for non DCB mode otherwise actual total RX PB
-	 * would be bigger than programmed and filter space would run into
-	 * the PB 0 region.
-	 */
-	for (i = 1; i < 8; i++)
-		IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), 0);
-
 	/* Send interrupt when 64 filters are left */
 	fdirctrl |= 4 << IXGBE_FDIRCTRL_FULL_THRESH_SHIFT;
 
@@ -2146,6 +2108,7 @@ static struct ixgbe_mac_operations mac_ops_82599 = {
 	.read_analog_reg8       = &ixgbe_read_analog_reg8_82599,
 	.write_analog_reg8      = &ixgbe_write_analog_reg8_82599,
 	.setup_link             = &ixgbe_setup_mac_link_82599,
+	.set_rxpba		= &ixgbe_set_rxpba_generic,
 	.check_link             = &ixgbe_check_mac_link_generic,
 	.get_link_capabilities  = &ixgbe_get_link_capabilities_82599,
 	.led_on                 = &ixgbe_led_on_generic,

drivers/net/ixgbe/ixgbe_common.c

@@ -3267,3 +3267,69 @@ s32 ixgbe_get_device_caps_generic(struct ixgbe_hw *hw, u16 *device_caps)
 
 	return 0;
 }
+
+/**
+ * ixgbe_set_rxpba_generic - Initialize RX packet buffer
+ * @hw: pointer to hardware structure
+ * @num_pb: number of packet buffers to allocate
+ * @headroom: reserve n KB of headroom
+ * @strategy: packet buffer allocation strategy
+ **/
+void ixgbe_set_rxpba_generic(struct ixgbe_hw *hw,
+			     int num_pb,
+			     u32 headroom,
+			     int strategy)
+{
+	u32 pbsize = hw->mac.rx_pb_size;
+	int i = 0;
+	u32 rxpktsize, txpktsize, txpbthresh;
+
+	/* Reserve headroom */
+	pbsize -= headroom;
+
+	if (!num_pb)
+		num_pb = 1;
+
+	/* Divide remaining packet buffer space amongst the number
+	 * of packet buffers requested using supplied strategy.
+	 */
+	switch (strategy) {
+	case (PBA_STRATEGY_WEIGHTED):
+		/* pba_80_48 strategy weight first half of packet buffer with
+		 * 5/8 of the packet buffer space.
+		 */
+		rxpktsize = ((pbsize * 5 * 2) / (num_pb * 8));
+		pbsize -= rxpktsize * (num_pb / 2);
+		rxpktsize <<= IXGBE_RXPBSIZE_SHIFT;
+		for (; i < (num_pb / 2); i++)
+			IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize);
+		/* Fall through to configure remaining packet buffers */
+	case (PBA_STRATEGY_EQUAL):
+		/* Divide the remaining Rx packet buffer evenly among the TCs */
+		rxpktsize = (pbsize / (num_pb - i)) << IXGBE_RXPBSIZE_SHIFT;
+		for (; i < num_pb; i++)
+			IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize);
+		break;
+	default:
+		break;
+	}
+
+	/*
+	 * Setup Tx packet buffer and threshold equally for all TCs
+	 * TXPBTHRESH register is set in K so divide by 1024 and subtract
+	 * 10 since the largest packet we support is just over 9K.
+	 */
+	txpktsize = IXGBE_TXPBSIZE_MAX / num_pb;
+	txpbthresh = (txpktsize / 1024) - IXGBE_TXPKT_SIZE_MAX;
+	for (i = 0; i < num_pb; i++) {
+		IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), txpktsize);
+		IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), txpbthresh);
+	}
+
+	/* Clear unused TCs, if any, to zero buffer size*/
+	for (; i < IXGBE_MAX_PB; i++) {
+		IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), 0);
+		IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), 0);
+		IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), 0);
+	}
+}

drivers/net/ixgbe/ixgbe_common.h

@@ -100,6 +100,9 @@ void ixgbe_set_mac_anti_spoofing(struct ixgbe_hw *hw, bool enable, int pf);
 void ixgbe_set_vlan_anti_spoofing(struct ixgbe_hw *hw, bool enable, int vf);
 s32 ixgbe_get_device_caps_generic(struct ixgbe_hw *hw, u16 *device_caps);
 
+void ixgbe_set_rxpba_generic(struct ixgbe_hw *hw, int num_pb,
+			     u32 headroom, int strategy);
+
 #define IXGBE_WRITE_REG(a, reg, value) writel((value), ((a)->hw_addr + (reg)))
 
 #ifndef writeq

drivers/net/ixgbe/ixgbe_dcb.c

@@ -258,15 +258,13 @@ s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw,
 
 	switch (hw->mac.type) {
 	case ixgbe_mac_82598EB:
-		ret = ixgbe_dcb_hw_config_82598(hw, dcb_config->rx_pba_cfg,
-						pfc_en, refill, max, bwgid,
-						ptype);
+		ret = ixgbe_dcb_hw_config_82598(hw, pfc_en, refill, max,
+						bwgid, ptype);
 		break;
 	case ixgbe_mac_82599EB:
 	case ixgbe_mac_X540:
-		ret = ixgbe_dcb_hw_config_82599(hw, dcb_config->rx_pba_cfg,
-						pfc_en, refill, max, bwgid,
-						ptype, prio_tc);
+		ret = ixgbe_dcb_hw_config_82599(hw, pfc_en, refill, max,
+						bwgid, ptype, prio_tc);
 		break;
 	default:
 		break;

drivers/net/ixgbe/ixgbe_dcb.h

@@ -123,11 +123,6 @@ struct tc_configuration {
 	u8 tc; /* Traffic class (TC) */
 };
 
-enum dcb_rx_pba_cfg {
-	pba_equal,     /* PBA[0-7] each use 64KB FIFO */
-	pba_80_48      /* PBA[0-3] each use 80KB, PBA[4-7] each use 48KB */
-};
-
 struct dcb_num_tcs {
 	u8 pg_tcs;
 	u8 pfc_tcs;
@@ -140,8 +135,6 @@ struct ixgbe_dcb_config {
 	u8     bw_percentage[2][MAX_BW_GROUP]; /* One each for Tx/Rx */
 	bool   pfc_mode_enable;
 
-	enum dcb_rx_pba_cfg rx_pba_cfg;
-
 	u32  dcb_cfg_version; /* Not used...OS-specific? */
 	u32  link_speed; /* For bandwidth allocation validation purpose */
 };

drivers/net/ixgbe/ixgbe_dcb_82598.c

@@ -31,45 +31,6 @@
 #include "ixgbe_dcb.h"
 #include "ixgbe_dcb_82598.h"
 
-/**
- * ixgbe_dcb_config_packet_buffers_82598 - Configure packet buffers
- * @hw: pointer to hardware structure
- * @dcb_config: pointer to ixgbe_dcb_config structure
- *
- * Configure packet buffers for DCB mode.
- */
-static s32 ixgbe_dcb_config_packet_buffers_82598(struct ixgbe_hw *hw, u8 rx_pba)
-{
-	s32 ret_val = 0;
-	u32 value = IXGBE_RXPBSIZE_64KB;
-	u8  i = 0;
-
-	/* Setup Rx packet buffer sizes */
-	switch (rx_pba) {
-	case pba_80_48:
-		/* Setup the first four at 80KB */
-		value = IXGBE_RXPBSIZE_80KB;
-		for (; i < 4; i++)
-			IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), value);
-		/* Setup the last four at 48KB...don't re-init i */
-		value = IXGBE_RXPBSIZE_48KB;
-		/* Fall Through */
-	case pba_equal:
-	default:
-		for (; i < IXGBE_MAX_PACKET_BUFFERS; i++)
-			IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), value);
-
-		/* Setup Tx packet buffer sizes */
-		for (i = 0; i < IXGBE_MAX_PACKET_BUFFERS; i++) {
-			IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i),
-					IXGBE_TXPBSIZE_40KB);
-		}
-		break;
-	}
-
-	return ret_val;
-}
-
 /**
  * ixgbe_dcb_config_rx_arbiter_82598 - Config Rx data arbiter
  * @hw: pointer to hardware structure
@@ -321,11 +282,9 @@ static s32 ixgbe_dcb_config_tc_stats_82598(struct ixgbe_hw *hw)
  *
  * Configure dcb settings and enable dcb mode.
  */
-s32 ixgbe_dcb_hw_config_82598(struct ixgbe_hw *hw,
-			      u8 rx_pba, u8 pfc_en, u16 *refill,
+s32 ixgbe_dcb_hw_config_82598(struct ixgbe_hw *hw, u8 pfc_en, u16 *refill,
 			      u16 *max, u8 *bwg_id, u8 *prio_type)
 {
-	ixgbe_dcb_config_packet_buffers_82598(hw, rx_pba);
 	ixgbe_dcb_config_rx_arbiter_82598(hw, refill, max, prio_type);
 	ixgbe_dcb_config_tx_desc_arbiter_82598(hw, refill, max,
 					       bwg_id, prio_type);

drivers/net/ixgbe/ixgbe_dcb_82598.h

@@ -91,8 +91,7 @@ s32 ixgbe_dcb_config_tx_data_arbiter_82598(struct ixgbe_hw *hw,
 						u8 *bwg_id,
 						u8 *prio_type);
 
-s32 ixgbe_dcb_hw_config_82598(struct ixgbe_hw *hw,
-			      u8 rx_pba, u8 pfc_en, u16 *refill,
+s32 ixgbe_dcb_hw_config_82598(struct ixgbe_hw *hw, u8 pfc_en, u16 *refill,
 			      u16 *max, u8 *bwg_id, u8 *prio_type);
 
 #endif /* _DCB_82598_CONFIG_H */

drivers/net/ixgbe/ixgbe_dcb_82599.c

@@ -30,63 +30,6 @@
 #include "ixgbe_dcb.h"
 #include "ixgbe_dcb_82599.h"
 
-/**
- * ixgbe_dcb_config_packet_buffers_82599 - Configure DCB packet buffers
- * @hw: pointer to hardware structure
- * @rx_pba: method to distribute packet buffer
- *
- * Configure packet buffers for DCB mode.
- */
-static s32 ixgbe_dcb_config_packet_buffers_82599(struct ixgbe_hw *hw, u8 rx_pba)
-{
-	int num_tcs = IXGBE_MAX_PACKET_BUFFERS;
-	u32 rx_pb_size = hw->mac.rx_pb_size << IXGBE_RXPBSIZE_SHIFT;
-	u32 rxpktsize;
-	u32 txpktsize;
-	u32 txpbthresh;
-	u8  i = 0;
-
-	/*
-	 * This really means configure the first half of the TCs
-	 * (Traffic Classes) to use 5/8 of the Rx packet buffer
-	 * space.  To determine the size of the buffer for each TC,
-	 * we are multiplying the average size by 5/4 and applying
-	 * it to half of the traffic classes.
-	 */
-	if (rx_pba == pba_80_48) {
-		rxpktsize = (rx_pb_size * 5) / (num_tcs * 4);
-		rx_pb_size -= rxpktsize * (num_tcs / 2);
-		for (; i < (num_tcs / 2); i++)
-			IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize);
-	}
-
-	/* Divide the remaining Rx packet buffer evenly among the TCs */
-	rxpktsize = rx_pb_size / (num_tcs - i);
-	for (; i < num_tcs; i++)
-		IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpktsize);
-
-	/*
-	 * Setup Tx packet buffer and threshold equally for all TCs
-	 * TXPBTHRESH register is set in K so divide by 1024 and subtract
-	 * 10 since the largest packet we support is just over 9K.
-	 */
-	txpktsize = IXGBE_TXPBSIZE_MAX / num_tcs;
-	txpbthresh = (txpktsize / 1024) - IXGBE_TXPKT_SIZE_MAX;
-	for (i = 0; i < num_tcs; i++) {
-		IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), txpktsize);
-		IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), txpbthresh);
-	}
-
-	/* Clear unused TCs, if any, to zero buffer size*/
-	for (; i < MAX_TRAFFIC_CLASS; i++) {
-		IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), 0);
-		IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), 0);
-		IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i), 0);
-	}
-
-	return 0;
-}
-
 /**
  * ixgbe_dcb_config_rx_arbiter_82599 - Config Rx Data arbiter
  * @hw: pointer to hardware structure
@@ -434,7 +377,6 @@ static s32 ixgbe_dcb_config_82599(struct ixgbe_hw *hw)
 /**
  * ixgbe_dcb_hw_config_82599 - Configure and enable DCB
  * @hw: pointer to hardware structure
- * @rx_pba: method to distribute packet buffer
  * @refill: refill credits index by traffic class
  * @max: max credits index by traffic class
  * @bwg_id: bandwidth grouping indexed by traffic class
@@ -443,11 +385,9 @@ static s32 ixgbe_dcb_config_82599(struct ixgbe_hw *hw)
  *
  * Configure dcb settings and enable dcb mode.
  */
-s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw,
-			      u8 rx_pba, u8 pfc_en, u16 *refill,
+s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw, u8 pfc_en, u16 *refill,
 			      u16 *max, u8 *bwg_id, u8 *prio_type, u8 *prio_tc)
 {
-	ixgbe_dcb_config_packet_buffers_82599(hw, rx_pba);
 	ixgbe_dcb_config_82599(hw);
 	ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max, bwg_id,
 					  prio_type, prio_tc);

drivers/net/ixgbe/ixgbe_dcb_82599.h

@@ -86,17 +86,6 @@
 #define IXGBE_RTTPCS_ARBD_SHIFT 22
 #define IXGBE_RTTPCS_ARBD_DCB   0x4        /* Arbitration delay in DCB mode */
 
-#define IXGBE_TXPBSIZE_20KB     0x00005000 /* 20KB Packet Buffer */
-#define IXGBE_TXPBSIZE_40KB     0x0000A000 /* 40KB Packet Buffer */
-#define IXGBE_RXPBSIZE_48KB     0x0000C000 /* 48KB Packet Buffer */
-#define IXGBE_RXPBSIZE_64KB     0x00010000 /* 64KB Packet Buffer */
-#define IXGBE_RXPBSIZE_80KB     0x00014000 /* 80KB Packet Buffer */
-#define IXGBE_RXPBSIZE_128KB    0x00020000 /* 128KB Packet Buffer */
-#define IXGBE_TXPBSIZE_MAX	0x00028000 /* 160KB Packet Buffer*/
-
-#define IXGBE_TXPBTHRESH_DCB    0xA        /* THRESH value for DCB mode */
-#define IXGBE_TXPKT_SIZE_MAX    0xA        /* Max Tx Packet size  */
-
 /* SECTXMINIFG DCB */
 #define IXGBE_SECTX_DCB		0x00001F00 /* DCB TX Buffer IFG */
 
@@ -127,8 +116,7 @@ s32 ixgbe_dcb_config_tx_data_arbiter_82599(struct ixgbe_hw *hw,
 						u8 *prio_type,
 						u8 *prio_tc);
 
-s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw,
-			      u8 rx_pba, u8 pfc_en, u16 *refill,
+s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw, u8 pfc_en, u16 *refill,
 			      u16 *max, u8 *bwg_id, u8 *prio_type,
 			      u8 *prio_tc);
 

drivers/net/ixgbe/ixgbe_main.c

@@ -3780,12 +3780,27 @@ static void ixgbe_configure_dcb(struct ixgbe_adapter *adapter)
 }
 
 #endif
+
+static void ixgbe_configure_pb(struct ixgbe_adapter *adapter)
+{
+	int hdrm = 0;
+	int num_tc = netdev_get_num_tc(adapter->netdev);
+	struct ixgbe_hw *hw = &adapter->hw;
+
+	if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE ||
+	    adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE)
+		hdrm = 64 << adapter->fdir_pballoc;
+
+	hw->mac.ops.set_rxpba(&adapter->hw, num_tc, hdrm, PBA_STRATEGY_EQUAL);
+}
+
 static void ixgbe_configure(struct ixgbe_adapter *adapter)
 {
 	struct net_device *netdev = adapter->netdev;
 	struct ixgbe_hw *hw = &adapter->hw;
 	int i;
 
+	ixgbe_configure_pb(adapter);
 #ifdef CONFIG_IXGBE_DCB
 	ixgbe_configure_dcb(adapter);
 #endif
@@ -5251,7 +5266,6 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
 	}
 	adapter->dcb_cfg.bw_percentage[DCB_TX_CONFIG][0] = 100;
 	adapter->dcb_cfg.bw_percentage[DCB_RX_CONFIG][0] = 100;
-	adapter->dcb_cfg.rx_pba_cfg = pba_equal;
 	adapter->dcb_cfg.pfc_mode_enable = false;
 	adapter->dcb_set_bitmap = 0x00;
 	adapter->dcbx_cap = DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_CEE;

drivers/net/ixgbe/ixgbe_type.h

@@ -1118,6 +1118,27 @@
 #define IXGBE_GPIE_VTMODE_32     0x00008000 /* 32 VFs 4 queues per VF */
 #define IXGBE_GPIE_VTMODE_64     0x0000C000 /* 64 VFs 2 queues per VF */
 
+/* Packet Buffer Initialization */
+#define IXGBE_TXPBSIZE_20KB     0x00005000 /* 20KB Packet Buffer */
+#define IXGBE_TXPBSIZE_40KB     0x0000A000 /* 40KB Packet Buffer */
+#define IXGBE_RXPBSIZE_48KB     0x0000C000 /* 48KB Packet Buffer */
+#define IXGBE_RXPBSIZE_64KB     0x00010000 /* 64KB Packet Buffer */
+#define IXGBE_RXPBSIZE_80KB     0x00014000 /* 80KB Packet Buffer */
+#define IXGBE_RXPBSIZE_128KB    0x00020000 /* 128KB Packet Buffer */
+#define IXGBE_RXPBSIZE_MAX      0x00080000 /* 512KB Packet Buffer*/
+#define IXGBE_TXPBSIZE_MAX      0x00028000 /* 160KB Packet Buffer*/
+
+#define IXGBE_TXPKT_SIZE_MAX    0xA        /* Max Tx Packet size  */
+#define IXGBE_MAX_PB		8
+
+/* Packet buffer allocation strategies */
+enum {
+	PBA_STRATEGY_EQUAL	= 0,	/* Distribute PB space equally */
+#define PBA_STRATEGY_EQUAL	PBA_STRATEGY_EQUAL
+	PBA_STRATEGY_WEIGHTED	= 1,	/* Weight front half of TCs */
+#define PBA_STRATEGY_WEIGHTED	PBA_STRATEGY_WEIGHTED
+};
+
 /* Transmit Flow Control status */
 #define IXGBE_TFCS_TXOFF         0x00000001
 #define IXGBE_TFCS_TXOFF0        0x00000100
@@ -2615,6 +2636,9 @@ struct ixgbe_mac_operations {
 	s32 (*get_link_capabilities)(struct ixgbe_hw *, ixgbe_link_speed *,
 	                             bool *);
 
+	/* Packet Buffer Manipulation */
+	void (*set_rxpba)(struct ixgbe_hw *, int, u32, int);
+
 	/* LED */
 	s32 (*led_on)(struct ixgbe_hw *, u32);
 	s32 (*led_off)(struct ixgbe_hw *, u32);

drivers/net/ixgbe/ixgbe_x540.c

@@ -876,6 +876,7 @@ static struct ixgbe_mac_operations mac_ops_X540 = {
 	.read_analog_reg8       = NULL,
 	.write_analog_reg8      = NULL,
 	.setup_link             = &ixgbe_setup_mac_link_X540,
+	.set_rxpba		= &ixgbe_set_rxpba_generic,
 	.check_link             = &ixgbe_check_mac_link_generic,
 	.get_link_capabilities  = &ixgbe_get_copper_link_capabilities_generic,
 	.led_on                 = &ixgbe_led_on_generic,