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>

1 files changed, 472 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_dcb_82599.c b/drivers/net/ixgbe/ixgbe_dcb_82599.c
new file mode 100644
index 000000000000..1467d56435a0
--- /dev/null
+++ b/drivers/net/ixgbe/ixgbe_dcb_82599.c
@@ -0,0 +1,472 @@
+/*******************************************************************************
+
+  Intel 10 Gigabit PCI Express Linux driver
+  Copyright(c) 1999 - 2009 Intel Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information:
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#include "ixgbe.h"
+#include "ixgbe_type.h"
+#include "ixgbe_dcb.h"
+#include "ixgbe_dcb_82599.h"
+
+/**
+ * ixgbe_dcb_get_tc_stats_82599 - Returns status for each traffic class
+ * @hw: pointer to hardware structure
+ * @stats: pointer to statistics structure
+ * @tc_count:  Number of elements in bwg_array.
+ *
+ * This function returns the status data for each of the Traffic Classes in use.
+ */
+s32 ixgbe_dcb_get_tc_stats_82599(struct ixgbe_hw *hw,
+                                 struct ixgbe_hw_stats *stats,
+                                 u8 tc_count)
+{
+	int tc;
+
+	if (tc_count > MAX_TRAFFIC_CLASS)
+		return DCB_ERR_PARAM;
+	/* Statistics pertaining to each traffic class */
+	for (tc = 0; tc < tc_count; tc++) {
+		/* Transmitted Packets */
+		stats->qptc[tc] += IXGBE_READ_REG(hw, IXGBE_QPTC(tc));
+		/* Transmitted Bytes */
+		stats->qbtc[tc] += IXGBE_READ_REG(hw, IXGBE_QBTC(tc));
+		/* Received Packets */
+		stats->qprc[tc] += IXGBE_READ_REG(hw, IXGBE_QPRC(tc));
+		/* Received Bytes */
+		stats->qbrc[tc] += IXGBE_READ_REG(hw, IXGBE_QBRC(tc));
+	}
+
+	return 0;
+}
+
+/**
+ * ixgbe_dcb_get_pfc_stats_82599 - Return CBFC status data
+ * @hw: pointer to hardware structure
+ * @stats: pointer to statistics structure
+ * @tc_count:  Number of elements in bwg_array.
+ *
+ * This function returns the CBFC status data for each of the Traffic Classes.
+ */
+s32 ixgbe_dcb_get_pfc_stats_82599(struct ixgbe_hw *hw,
+                                  struct ixgbe_hw_stats *stats,
+                                  u8 tc_count)
+{
+	int tc;
+
+	if (tc_count > MAX_TRAFFIC_CLASS)
+		return DCB_ERR_PARAM;
+	for (tc = 0; tc < tc_count; tc++) {
+		/* Priority XOFF Transmitted */
+		stats->pxofftxc[tc] += IXGBE_READ_REG(hw, IXGBE_PXOFFTXC(tc));
+		/* Priority XOFF Received */
+		stats->pxoffrxc[tc] += IXGBE_READ_REG(hw, IXGBE_PXOFFRXCNT(tc));
+	}
+
+	return 0;
+}
+
+/**
+ * ixgbe_dcb_config_packet_buffers_82599 - Configure DCB packet buffers
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure packet buffers for DCB mode.
+ */
+s32 ixgbe_dcb_config_packet_buffers_82599(struct ixgbe_hw *hw,
+                                          struct ixgbe_dcb_config *dcb_config)
+{
+	s32 ret_val = 0;
+	u32 value = IXGBE_RXPBSIZE_64KB;
+	u8  i = 0;
+
+	/* Setup Rx packet buffer sizes */
+	switch (dcb_config->rx_pba_cfg) {
+	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_20KB);
+			IXGBE_WRITE_REG(hw, IXGBE_TXPBTHRESH(i),
+			                IXGBE_TXPBTHRESH_DCB);
+		}
+		break;
+	}
+
+	return ret_val;
+}
+
+/**
+ * ixgbe_dcb_config_rx_arbiter_82599 - Config Rx Data arbiter
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Rx Packet Arbiter and credits for each traffic class.
+ */
+s32 ixgbe_dcb_config_rx_arbiter_82599(struct ixgbe_hw *hw,
+                                      struct ixgbe_dcb_config *dcb_config)
+{
+	struct tc_bw_alloc    *p;
+	u32    reg           = 0;
+	u32    credit_refill = 0;
+	u32    credit_max    = 0;
+	u8     i             = 0;
+
+	/* Disable the arbiter before changing parameters */
+	IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, IXGBE_RTRPCS_ARBDIS);
+
+	/* Map all traffic classes to their UP, 1 to 1 */
+	reg = 0;
+	for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
+		reg |= (i << (i * IXGBE_RTRUP2TC_UP_SHIFT));
+	IXGBE_WRITE_REG(hw, IXGBE_RTRUP2TC, reg);
+
+	/* Configure traffic class credits and priority */
+	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+		p = &dcb_config->tc_config[i].path[DCB_RX_CONFIG];
+
+		credit_refill = p->data_credits_refill;
+		credit_max    = p->data_credits_max;
+		reg = credit_refill | (credit_max << IXGBE_RTRPT4C_MCL_SHIFT);
+
+		reg |= (u32)(p->bwg_id) << IXGBE_RTRPT4C_BWG_SHIFT;
+
+		if (p->prio_type == prio_link)
+			reg |= IXGBE_RTRPT4C_LSP;
+
+		IXGBE_WRITE_REG(hw, IXGBE_RTRPT4C(i), reg);
+	}
+
+	/*
+	 * Configure Rx packet plane (recycle mode; WSP) and
+	 * enable arbiter
+	 */
+	reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC;
+	IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);
+
+	return 0;
+}
+
+/**
+ * ixgbe_dcb_config_tx_desc_arbiter_82599 - Config Tx Desc. arbiter
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Tx Descriptor Arbiter and credits for each traffic class.
+ */
+s32 ixgbe_dcb_config_tx_desc_arbiter_82599(struct ixgbe_hw *hw,
+                                           struct ixgbe_dcb_config *dcb_config)
+{
+	struct tc_bw_alloc *p;
+	u32    reg, max_credits;
+	u8     i;
+
+	/* Disable the arbiter before changing parameters */
+	IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, IXGBE_RTTDCS_ARBDIS);
+
+	/* Clear the per-Tx queue credits; we use per-TC instead */
+	for (i = 0; i < 128; i++) {
+		IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, i);
+		IXGBE_WRITE_REG(hw, IXGBE_RTTDT1C, 0);
+	}
+
+	/* Configure traffic class credits and priority */
+	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+		p = &dcb_config->tc_config[i].path[DCB_TX_CONFIG];
+		max_credits = dcb_config->tc_config[i].desc_credits_max;
+		reg = max_credits << IXGBE_RTTDT2C_MCL_SHIFT;
+		reg |= p->data_credits_refill;
+		reg |= (u32)(p->bwg_id) << IXGBE_RTTDT2C_BWG_SHIFT;
+
+		if (p->prio_type == prio_group)
+			reg |= IXGBE_RTTDT2C_GSP;
+
+		if (p->prio_type == prio_link)
+			reg |= IXGBE_RTTDT2C_LSP;
+
+		IXGBE_WRITE_REG(hw, IXGBE_RTTDT2C(i), reg);
+	}
+
+	/*
+	 * Configure Tx descriptor plane (recycle mode; WSP) and
+	 * enable arbiter
+	 */
+	reg = IXGBE_RTTDCS_TDPAC | IXGBE_RTTDCS_TDRM;
+	IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);
+
+	return 0;
+}
+
+/**
+ * ixgbe_dcb_config_tx_data_arbiter_82599 - Config Tx Data arbiter
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Tx Packet Arbiter and credits for each traffic class.
+ */
+s32 ixgbe_dcb_config_tx_data_arbiter_82599(struct ixgbe_hw *hw,
+                                           struct ixgbe_dcb_config *dcb_config)
+{
+	struct tc_bw_alloc *p;
+	u32 reg;
+	u8 i;
+
+	/* Disable the arbiter before changing parameters */
+	IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, IXGBE_RTTPCS_ARBDIS);
+
+	/* Map all traffic classes to their UP, 1 to 1 */
+	reg = 0;
+	for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
+		reg |= (i << (i * IXGBE_RTTUP2TC_UP_SHIFT));
+	IXGBE_WRITE_REG(hw, IXGBE_RTTUP2TC, reg);
+
+	/* Configure traffic class credits and priority */
+	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+		p = &dcb_config->tc_config[i].path[DCB_TX_CONFIG];
+		reg = p->data_credits_refill;
+		reg |= (u32)(p->data_credits_max) << IXGBE_RTTPT2C_MCL_SHIFT;
+		reg |= (u32)(p->bwg_id) << IXGBE_RTTPT2C_BWG_SHIFT;
+
+		if (p->prio_type == prio_group)
+			reg |= IXGBE_RTTPT2C_GSP;
+
+		if (p->prio_type == prio_link)
+			reg |= IXGBE_RTTPT2C_LSP;
+
+		IXGBE_WRITE_REG(hw, IXGBE_RTTPT2C(i), reg);
+	}
+
+	/*
+	 * Configure Tx packet plane (recycle mode; SP; arb delay) and
+	 * enable arbiter
+	 */
+	reg = IXGBE_RTTPCS_TPPAC | IXGBE_RTTPCS_TPRM |
+	      (IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT);
+	IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg);
+
+	return 0;
+}
+
+/**
+ * ixgbe_dcb_config_pfc_82599 - Configure priority flow control
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Priority Flow Control (PFC) for each traffic class.
+ */
+s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw,
+                               struct ixgbe_dcb_config *dcb_config)
+{
+	u32 i, reg;
+
+	/* If PFC is disabled globally then fall back to LFC. */
+	if (!dcb_config->pfc_mode_enable) {
+		for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
+			hw->mac.ops.setup_fc(hw, i);
+		goto out;
+	}
+
+	/* PFC is mutually exclusive with link flow control */
+	hw->fc.current_mode = ixgbe_fc_none;
+
+	/* Configure PFC Tx thresholds per TC */
+	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+		/* Config and remember Tx */
+		if (dcb_config->tc_config[i].dcb_pfc == pfc_enabled_full ||
+		    dcb_config->tc_config[i].dcb_pfc == pfc_enabled_tx) {
+			reg = hw->fc.high_water | IXGBE_FCRTH_FCEN;
+			IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg);
+			reg = hw->fc.low_water | IXGBE_FCRTL_XONE;
+			IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), reg);
+		} else {
+			IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), 0);
+			IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0);
+		}
+	}
+
+	/* Configure pause time (2 TCs per register) */
+	reg = hw->fc.pause_time | (hw->fc.pause_time << 16);
+	for (i = 0; i < (MAX_TRAFFIC_CLASS / 2); i++)
+		IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);
+
+	/* Configure flow control refresh threshold value */
+	IXGBE_WRITE_REG(hw, IXGBE_FCRTV, hw->fc.pause_time / 2);
+
+	/* Enable Transmit PFC */
+	reg = IXGBE_FCCFG_TFCE_PRIORITY;
+	IXGBE_WRITE_REG(hw, IXGBE_FCCFG, reg);
+
+	/*
+	 * Enable Receive PFC
+	 * We will always honor XOFF frames we receive when
+	 * we are in PFC mode.
+	 */
+	reg = IXGBE_READ_REG(hw, IXGBE_MFLCN);
+	reg &= ~IXGBE_MFLCN_RFCE;
+	reg |= IXGBE_MFLCN_RPFCE;
+	IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg);
+out:
+	return 0;
+}
+
+/**
+ * ixgbe_dcb_config_tc_stats_82599 - Config traffic class statistics
+ * @hw: pointer to hardware structure
+ *
+ * Configure queue statistics registers, all queues belonging to same traffic
+ * class uses a single set of queue statistics counters.
+ */
+s32 ixgbe_dcb_config_tc_stats_82599(struct ixgbe_hw *hw)
+{
+	u32 reg = 0;
+	u8  i   = 0;
+
+	/*
+	 * Receive Queues stats setting
+	 * 32 RQSMR registers, each configuring 4 queues.
+	 * Set all 16 queues of each TC to the same stat
+	 * with TC 'n' going to stat 'n'.
+	 */
+	for (i = 0; i < 32; i++) {
+		reg = 0x01010101 * (i / 4);
+		IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i), reg);
+	}
+	/*
+	 * Transmit Queues stats setting
+	 * 32 TQSM registers, each controlling 4 queues.
+	 * Set all queues of each TC to the same stat
+	 * with TC 'n' going to stat 'n'.
+	 * Tx queues are allocated non-uniformly to TCs:
+	 * 32, 32, 16, 16, 8, 8, 8, 8.
+	 */
+	for (i = 0; i < 32; i++) {
+		if (i < 8)
+			reg = 0x00000000;
+		else if (i < 16)
+			reg = 0x01010101;
+		else if (i < 20)
+			reg = 0x02020202;
+		else if (i < 24)
+			reg = 0x03030303;
+		else if (i < 26)
+			reg = 0x04040404;
+		else if (i < 28)
+			reg = 0x05050505;
+		else if (i < 30)
+			reg = 0x06060606;
+		else
+			reg = 0x07070707;
+		IXGBE_WRITE_REG(hw, IXGBE_TQSM(i), reg);
+	}
+
+	return 0;
+}
+
+/**
+ * ixgbe_dcb_config_82599 - Configure general DCB parameters
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure general DCB parameters.
+ */
+s32 ixgbe_dcb_config_82599(struct ixgbe_hw *hw)
+{
+	u32 reg;
+	u32 q;
+
+	/* Disable the Tx desc arbiter so that MTQC can be changed */
+	reg = IXGBE_READ_REG(hw, IXGBE_RTTDCS);
+	reg |= IXGBE_RTTDCS_ARBDIS;
+	IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);
+
+	/* Enable DCB for Rx with 8 TCs */
+	reg = IXGBE_READ_REG(hw, IXGBE_MRQC);
+	switch (reg & IXGBE_MRQC_MRQE_MASK) {
+	case 0:
+	case IXGBE_MRQC_RT4TCEN:
+		/* RSS disabled cases */
+		reg = (reg & ~IXGBE_MRQC_MRQE_MASK) | IXGBE_MRQC_RT8TCEN;
+		break;
+	case IXGBE_MRQC_RSSEN:
+	case IXGBE_MRQC_RTRSS4TCEN:
+		/* RSS enabled cases */
+		reg = (reg & ~IXGBE_MRQC_MRQE_MASK) | IXGBE_MRQC_RTRSS8TCEN;
+		break;
+	default:
+		/* Unsupported value, assume stale data, overwrite no RSS */
+		reg = (reg & ~IXGBE_MRQC_MRQE_MASK) | IXGBE_MRQC_RT8TCEN;
+	}
+	IXGBE_WRITE_REG(hw, IXGBE_MRQC, reg);
+
+	/* Enable DCB for Tx with 8 TCs */
+	reg = IXGBE_MTQC_RT_ENA | IXGBE_MTQC_8TC_8TQ;
+	IXGBE_WRITE_REG(hw, IXGBE_MTQC, reg);
+
+	/* Disable drop for all queues */
+	for (q = 0; q < 128; q++)
+		IXGBE_WRITE_REG(hw, IXGBE_QDE, q << IXGBE_QDE_IDX_SHIFT);
+
+	/* Enable the Tx desc arbiter */
+	reg = IXGBE_READ_REG(hw, IXGBE_RTTDCS);
+	reg &= ~IXGBE_RTTDCS_ARBDIS;
+	IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);
+
+	return 0;
+}
+
+/**
+ * ixgbe_dcb_hw_config_82599 - Configure and enable DCB
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure dcb settings and enable dcb mode.
+ */
+s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw,
+                              struct ixgbe_dcb_config *dcb_config)
+{
+	u32  pap = 0;
+
+	ixgbe_dcb_config_packet_buffers_82599(hw, dcb_config);
+	ixgbe_dcb_config_82599(hw);
+	ixgbe_dcb_config_rx_arbiter_82599(hw, dcb_config);
+	ixgbe_dcb_config_tx_desc_arbiter_82599(hw, dcb_config);
+	ixgbe_dcb_config_tx_data_arbiter_82599(hw, dcb_config);
+	ixgbe_dcb_config_pfc_82599(hw, dcb_config);
+	ixgbe_dcb_config_tc_stats_82599(hw);
+
+	return 0;
+}
+