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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 6/11] DCB support
These files handle Data Center Bridging support for the ixgbe driver.
DCB was formerly known as Data Center Ethernet; it is a combination of
protocols and hardware support to allow for multiple traffic classes,
including lossless and guaranteed bandwidth, over standard Ethernet
networks.
Signed-off-by: Mitch Williams <mitch.a.williams@xxxxxxxxx>
diff -urpN -X dontdiff a/drivers/net/ixgbe/ixgbe_dcb_82598.c
b/drivers/net/ixgbe/ixgbe_dcb_82598.c
--- a/drivers/net/ixgbe/ixgbe_dcb_82598.c 1969-12-31 16:00:00.000000000
-0800
+++ b/drivers/net/ixgbe/ixgbe_dcb_82598.c 2009-01-22 11:33:59.000000000
-0800
@@ -0,0 +1,413 @@
+/*******************************************************************************
+
+ Intel 10 Gigabit PCI Express Linux driver
+ Copyright(c) 1999 - 2008 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@xxxxxxxxxxxxxxxxxxxxx>
+ Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+
+#include "ixgbe_type.h"
+#include "ixgbe_dcb.h"
+#include "ixgbe_dcb_82598.h"
+
+/**
+ * ixgbe_dcb_get_tc_stats_82598 - Return status data 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_82598(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));
+
+#if 0
+ /* Can we get rid of these?? Consequently, getting rid
+ * of the tc_stats structure.
+ */
+ tc_stats_array[up]->in_overflow_discards = 0;
+ tc_stats_array[up]->out_overflow_discards = 0;
+#endif
+ }
+
+ return 0;
+}
+
+/**
+ * ixgbe_dcb_get_pfc_stats_82598 - Returns 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_82598(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_PXOFFRXC(tc));
+ }
+
+ return 0;
+}
+
+/**
+ * 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.
+ */
+s32 ixgbe_dcb_config_packet_buffers_82598(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_40KB);
+ }
+ break;
+ }
+
+ return ret_val;
+}
+
+/**
+ * ixgbe_dcb_config_rx_arbiter_82598 - Config Rx data arbiter
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Rx Data Arbiter and credits for each traffic class.
+ */
+s32 ixgbe_dcb_config_rx_arbiter_82598(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;
+
+ reg = IXGBE_READ_REG(hw, IXGBE_RUPPBMR) | IXGBE_RUPPBMR_MQA;
+ IXGBE_WRITE_REG(hw, IXGBE_RUPPBMR, reg);
+
+ reg = IXGBE_READ_REG(hw, IXGBE_RMCS);
+ /* Enable Arbiter */
+ reg &= ~IXGBE_RMCS_ARBDIS;
+ /* Enable Receive Recycle within the BWG */
+ reg |= IXGBE_RMCS_RRM;
+ /* Enable Deficit Fixed Priority arbitration*/
+ reg |= IXGBE_RMCS_DFP;
+
+ IXGBE_WRITE_REG(hw, IXGBE_RMCS, 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_RT2CR_MCL_SHIFT);
+
+ if (p->prio_type == prio_link)
+ reg |= IXGBE_RT2CR_LSP;
+
+ IXGBE_WRITE_REG(hw, IXGBE_RT2CR(i), reg);
+ }
+
+ reg = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
+ reg |= IXGBE_RDRXCTL_RDMTS_1_2;
+ reg |= IXGBE_RDRXCTL_MPBEN;
+ reg |= IXGBE_RDRXCTL_MCEN;
+ IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, reg);
+
+ reg = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
+ /* Make sure there is enough descriptors before arbitration */
+ reg &= ~IXGBE_RXCTRL_DMBYPS;
+ IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, reg);
+
+ return 0;
+}
+
+/**
+ * ixgbe_dcb_config_tx_desc_arbiter_82598 - 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_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ struct tc_bw_alloc *p;
+ u32 reg, max_credits;
+ u8 i;
+
+ reg = IXGBE_READ_REG(hw, IXGBE_DPMCS);
+
+ /* Enable arbiter */
+ reg &= ~IXGBE_DPMCS_ARBDIS;
+ if (!(dcb_config->round_robin_enable)) {
+ /* Enable DFP and Recycle mode */
+ reg |= (IXGBE_DPMCS_TDPAC | IXGBE_DPMCS_TRM);
+ }
+ reg |= IXGBE_DPMCS_TSOEF;
+ /* Configure Max TSO packet size 34KB including payload and headers */
+ reg |= (0x4 << IXGBE_DPMCS_MTSOS_SHIFT);
+
+ IXGBE_WRITE_REG(hw, IXGBE_DPMCS, 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];
+ max_credits = dcb_config->tc_config[i].desc_credits_max;
+ reg = max_credits << IXGBE_TDTQ2TCCR_MCL_SHIFT;
+ reg |= p->data_credits_refill;
+ reg |= (u32)(p->bwg_id) << IXGBE_TDTQ2TCCR_BWG_SHIFT;
+
+ if (p->prio_type == prio_group)
+ reg |= IXGBE_TDTQ2TCCR_GSP;
+
+ if (p->prio_type == prio_link)
+ reg |= IXGBE_TDTQ2TCCR_LSP;
+
+ IXGBE_WRITE_REG(hw, IXGBE_TDTQ2TCCR(i), reg);
+ }
+
+ return 0;
+}
+
+/**
+ * ixgbe_dcb_config_tx_data_arbiter_82598 - Config Tx data arbiter
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Tx Data Arbiter and credits for each traffic class.
+ */
+s32 ixgbe_dcb_config_tx_data_arbiter_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ struct tc_bw_alloc *p;
+ u32 reg;
+ u8 i;
+
+ reg = IXGBE_READ_REG(hw, IXGBE_PDPMCS);
+ /* Enable Data Plane Arbiter */
+ reg &= ~IXGBE_PDPMCS_ARBDIS;
+ /* Enable DFP and Transmit Recycle Mode */
+ reg |= (IXGBE_PDPMCS_TPPAC | IXGBE_PDPMCS_TRM);
+
+ IXGBE_WRITE_REG(hw, IXGBE_PDPMCS, 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_TDPT2TCCR_MCL_SHIFT;
+ reg |= (u32)(p->bwg_id) << IXGBE_TDPT2TCCR_BWG_SHIFT;
+
+ if (p->prio_type == prio_group)
+ reg |= IXGBE_TDPT2TCCR_GSP;
+
+ if (p->prio_type == prio_link)
+ reg |= IXGBE_TDPT2TCCR_LSP;
+
+ IXGBE_WRITE_REG(hw, IXGBE_TDPT2TCCR(i), reg);
+ }
+
+ /* Enable Tx packet buffer division */
+ reg = IXGBE_READ_REG(hw, IXGBE_DTXCTL);
+ reg |= IXGBE_DTXCTL_ENDBUBD;
+ IXGBE_WRITE_REG(hw, IXGBE_DTXCTL, reg);
+
+ return 0;
+}
+
+/**
+ * ixgbe_dcb_config_pfc_82598 - Config priority flow control
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Priority Flow Control for each traffic class.
+ */
+s32 ixgbe_dcb_config_pfc_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ u32 reg, rx_pba_size;
+ u8 i;
+
+ /* Enable Transmit Priority Flow Control */
+ reg = IXGBE_READ_REG(hw, IXGBE_RMCS);
+ reg &= ~IXGBE_RMCS_TFCE_802_3X;
+ /* correct the reporting of our flow control status */
+ hw->fc.current_mode = ixgbe_fc_none;
+ reg |= IXGBE_RMCS_TFCE_PRIORITY;
+ IXGBE_WRITE_REG(hw, IXGBE_RMCS, reg);
+
+ /* Enable Receive Priority Flow Control */
+ reg = IXGBE_READ_REG(hw, IXGBE_FCTRL);
+ reg &= ~IXGBE_FCTRL_RFCE;
+ reg |= IXGBE_FCTRL_RPFCE;
+ IXGBE_WRITE_REG(hw, IXGBE_FCTRL, reg);
+
+ /*
+ * Configure flow control thresholds and enable priority flow control
+ * for each traffic class.
+ */
+ for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+ if (dcb_config->rx_pba_cfg == pba_equal) {
+ rx_pba_size = IXGBE_RXPBSIZE_64KB;
+ } else {
+ rx_pba_size = (i < 4) ? IXGBE_RXPBSIZE_80KB
+ : IXGBE_RXPBSIZE_48KB;
+ }
+
+ reg = ((rx_pba_size >> 5) & 0xFFF0);
+ if (dcb_config->tc_config[i].dcb_pfc == pfc_enabled_tx ||
+ dcb_config->tc_config[i].dcb_pfc == pfc_enabled_full)
+ reg |= IXGBE_FCRTL_XONE;
+
+ IXGBE_WRITE_REG(hw, IXGBE_FCRTL(i), reg);
+
+ reg = ((rx_pba_size >> 2) & 0xFFF0);
+ if (dcb_config->tc_config[i].dcb_pfc == pfc_enabled_tx ||
+ dcb_config->tc_config[i].dcb_pfc == pfc_enabled_full)
+ reg |= IXGBE_FCRTH_FCEN;
+
+ IXGBE_WRITE_REG(hw, IXGBE_FCRTH(i), reg);
+ }
+
+ /* Configure pause time */
+ for (i = 0; i < (MAX_TRAFFIC_CLASS >> 1); i++)
+ IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), 0x68006800);
+
+ /* Configure flow control refresh threshold value */
+ IXGBE_WRITE_REG(hw, IXGBE_FCRTV, 0x3400);
+
+ return 0;
+}
+
+/**
+ * ixgbe_dcb_config_tc_stats_82598 - Configure 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_82598(struct ixgbe_hw *hw)
+{
+ u32 reg = 0;
+ u8 i = 0;
+ u8 j = 0;
+
+ /* Receive Queues stats setting - 8 queues per statistics reg */
+ for (i = 0, j = 0; i < 15 && j < 8; i = i + 2, j++) {
+ reg = IXGBE_READ_REG(hw, IXGBE_RQSMR(i));
+ reg |= ((0x1010101) * j);
+ IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i), reg);
+ reg = IXGBE_READ_REG(hw, IXGBE_RQSMR(i + 1));
+ reg |= ((0x1010101) * j);
+ IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i + 1), reg);
+ }
+ /* Transmit Queues stats setting - 4 queues per statistics reg*/
+ for (i = 0; i < 8; i++) {
+ reg = IXGBE_READ_REG(hw, IXGBE_TQSMR(i));
+ reg |= ((0x1010101) * i);
+ IXGBE_WRITE_REG(hw, IXGBE_TQSMR(i), reg);
+ }
+
+ return 0;
+}
+
+/**
+ * ixgbe_dcb_hw_config_82598 - Config 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_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ u32 pap = 0;
+
+ ixgbe_dcb_config_packet_buffers_82598(hw, dcb_config);
+ ixgbe_dcb_config_rx_arbiter_82598(hw, dcb_config);
+ ixgbe_dcb_config_tx_desc_arbiter_82598(hw, dcb_config);
+ ixgbe_dcb_config_tx_data_arbiter_82598(hw, dcb_config);
+ ixgbe_dcb_config_pfc_82598(hw, dcb_config);
+ ixgbe_dcb_config_tc_stats_82598(hw);
+
+ /* TODO: For DCB SV purpose only,
+ * remove it before product release */
+ if (dcb_config->link_speed > 0 && dcb_config->link_speed <= 9) {
+ pap = IXGBE_READ_REG(hw, IXGBE_PAP);
+ pap |= (dcb_config->link_speed << 16);
+ IXGBE_WRITE_REG(hw, IXGBE_PAP, pap);
+ }
+
+ return 0;
+}
diff -urpN -X dontdiff a/drivers/net/ixgbe/ixgbe_dcb_82598.h
b/drivers/net/ixgbe/ixgbe_dcb_82598.h
--- a/drivers/net/ixgbe/ixgbe_dcb_82598.h 1969-12-31 16:00:00.000000000
-0800
+++ b/drivers/net/ixgbe/ixgbe_dcb_82598.h 2009-01-22 11:33:59.000000000
-0800
@@ -0,0 +1,99 @@
+/*******************************************************************************
+
+ Intel 10 Gigabit PCI Express Linux driver
+ Copyright(c) 1999 - 2008 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@xxxxxxxxxxxxxxxxxxxxx>
+ Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#ifndef _DCB_82598_CONFIG_H_
+#define _DCB_82598_CONFIG_H_
+
+/* DCB register definitions */
+
+#define IXGBE_DPMCS_MTSOS_SHIFT 16
+#define IXGBE_DPMCS_TDPAC 0x00000001 /* 0 Round Robin,
+ * 1 DFP - Deficit Fixed Priority */
+#define IXGBE_DPMCS_TRM 0x00000010 /* Transmit Recycle Mode */
+#define IXGBE_DPMCS_ARBDIS 0x00000040 /* DCB arbiter disable */
+#define IXGBE_DPMCS_TSOEF 0x00080000 /* TSO Expand Factor: 0=x4, 1=x2 */
+
+#define IXGBE_RUPPBMR_MQA 0x80000000 /* Enable UP to queue mapping */
+
+#define IXGBE_RT2CR_MCL_SHIFT 12 /* Offset to Max Credit Limit setting */
+#define IXGBE_RT2CR_LSP 0x80000000 /* LSP enable bit */
+
+#define IXGBE_RDRXCTL_MPBEN 0x00000010 /* DMA config for multiple packet
+ * buffers enable */
+#define IXGBE_RDRXCTL_MCEN 0x00000040 /* DMA config for multiple cores
+ * (RSS) enable */
+
+#define IXGBE_TDTQ2TCCR_MCL_SHIFT 12
+#define IXGBE_TDTQ2TCCR_BWG_SHIFT 9
+#define IXGBE_TDTQ2TCCR_GSP 0x40000000
+#define IXGBE_TDTQ2TCCR_LSP 0x80000000
+
+#define IXGBE_TDPT2TCCR_MCL_SHIFT 12
+#define IXGBE_TDPT2TCCR_BWG_SHIFT 9
+#define IXGBE_TDPT2TCCR_GSP 0x40000000
+#define IXGBE_TDPT2TCCR_LSP 0x80000000
+
+#define IXGBE_PDPMCS_TPPAC 0x00000020 /* 0 Round Robin,
+ * 1 DFP - Deficit Fixed Priority */
+#define IXGBE_PDPMCS_ARBDIS 0x00000040 /* Arbiter disable */
+#define IXGBE_PDPMCS_TRM 0x00000100 /* Transmit Recycle Mode enable */
+
+#define IXGBE_DTXCTL_ENDBUBD 0x00000004 /* Enable DBU buffer division */
+
+#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 */
+
+/* DCB hardware-specific driver APIs */
+
+/* DCB PFC functions */
+s32 ixgbe_dcb_config_pfc_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config);
+s32 ixgbe_dcb_get_pfc_stats_82598(struct ixgbe_hw *hw,
+ struct ixgbe_hw_stats *stats,
+ u8 tc_count);
+
+/* DCB traffic class stats */
+s32 ixgbe_dcb_config_tc_stats_82598(struct ixgbe_hw *hw);
+s32 ixgbe_dcb_get_tc_stats_82598(struct ixgbe_hw *hw,
+ struct ixgbe_hw_stats *stats,
+ u8 tc_count);
+
+/* DCB config arbiters */
+s32 ixgbe_dcb_config_tx_desc_arbiter_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config
*dcb_config);
+s32 ixgbe_dcb_config_tx_data_arbiter_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config
*dcb_config);
+s32 ixgbe_dcb_config_rx_arbiter_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config);
+
+/* DCB hw initialization */
+s32 ixgbe_dcb_hw_config_82598(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *config);
+
+#endif /* _DCB_82598_CONFIG_H */
diff -urpN -X dontdiff a/drivers/net/ixgbe/ixgbe_dcb.c
b/drivers/net/ixgbe/ixgbe_dcb.c
--- a/drivers/net/ixgbe/ixgbe_dcb.c 1969-12-31 16:00:00.000000000 -0800
+++ b/drivers/net/ixgbe/ixgbe_dcb.c 2009-01-22 11:33:59.000000000 -0800
@@ -0,0 +1,333 @@
+/*******************************************************************************
+
+ Intel 10 Gigabit PCI Express Linux driver
+ Copyright(c) 1999 - 2008 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@xxxxxxxxxxxxxxxxxxxxx>
+ Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+
+#include "ixgbe_type.h"
+#include "ixgbe_dcb.h"
+#include "ixgbe_dcb_82598.h"
+
+/**
+ * ixgbe_dcb_config - Struct containing DCB settings.
+ * @dcb_config: Pointer to DCB config structure
+ *
+ * This function checks DCB rules for DCB settings.
+ * The following rules are checked:
+ * 1. The sum of bandwidth percentages of all Bandwidth Groups must total 100%.
+ * 2. The sum of bandwidth percentages of all Traffic Classes within
a Bandwidth
+ * Group must total 100.
+ * 3. A Traffic Class should not be set to both Link Strict Priority
+ * and Group Strict Priority.
+ * 4. Link strict Bandwidth Groups can only have link strict traffic classes
+ * with zero bandwidth.
+ */
+s32 ixgbe_dcb_check_config(struct ixgbe_dcb_config *dcb_config)
+{
+ struct tc_bw_alloc *p;
+ s32 ret_val = 0;
+ u8 i, j, bw = 0, bw_id;
+ u8 bw_sum[2][MAX_BW_GROUP];
+ bool link_strict[2][MAX_BW_GROUP];
+
+ memset(bw_sum, 0, sizeof(bw_sum));
+ memset(link_strict, 0, sizeof(link_strict));
+
+ /* First Tx, then Rx */
+ for (i = 0; i < 2; i++) {
+ /* Check each traffic class for rule violation */
+ for (j = 0; j < MAX_TRAFFIC_CLASS; j++) {
+ p = &dcb_config->tc_config[j].path[i];
+
+ bw = p->bwg_percent;
+ bw_id = p->bwg_id;
+
+ if (bw_id >= MAX_BW_GROUP) {
+ ret_val = DCB_ERR_CONFIG;
+ goto err_config;
+ }
+ if (p->prio_type == prio_link) {
+ link_strict[i][bw_id] = true;
+ /* Link strict should have zero bandwidth */
+ if (bw) {
+ ret_val = DCB_ERR_LS_BW_NONZERO;
+ goto err_config;
+ }
+ } else if (!bw) {
+ /*
+ * Traffic classes without link strict
+ * should have non-zero bandwidth.
+ */
+ ret_val = DCB_ERR_TC_BW_ZERO;
+ goto err_config;
+ }
+ bw_sum[i][bw_id] += bw;
+ }
+
+ bw = 0;
+
+ /* Check each bandwidth group for rule violation */
+ for (j = 0; j < MAX_BW_GROUP; j++) {
+ bw += dcb_config->bw_percentage[i][j];
+ /*
+ * Sum of bandwidth percentages of all traffic classes
+ * within a Bandwidth Group must total 100 except for
+ * link strict group (zero bandwidth).
+ */
+ if (link_strict[i][j]) {
+ if (bw_sum[i][j]) {
+ /*
+ * Link strict group should have zero
+ * bandwidth.
+ */
+ ret_val = DCB_ERR_LS_BWG_NONZERO;
+ goto err_config;
+ }
+ } else if (bw_sum[i][j] != BW_PERCENT &&
+ bw_sum[i][j] != 0) {
+ ret_val = DCB_ERR_TC_BW;
+ goto err_config;
+ }
+ }
+
+ if (bw != BW_PERCENT) {
+ ret_val = DCB_ERR_BW_GROUP;
+ goto err_config;
+ }
+ }
+
+ return DCB_SUCCESS;
+
+err_config:
+ hw_dbg(hw, "DCB error code %d while checking %s settings.\n",
+ ret_val, (j == DCB_TX_CONFIG) ? "Tx" : "Rx");
+
+ return ret_val;
+}
+
+/**
+ * ixgbe_dcb_calculate_tc_credits - Calculates traffic class credits
+ * @ixgbe_dcb_config: Struct containing DCB settings.
+ * @direction: Configuring either Tx or Rx.
+ *
+ * This function calculates the credits allocated to each traffic class.
+ * It should be called only after the rules are checked by
+ * ixgbe_dcb_check_config().
+ */
+s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *dcb_config,
+ u8 direction)
+{
+ struct tc_bw_alloc *p;
+ s32 ret_val = 0;
+ /* Initialization values default for Tx settings */
+ u32 credit_refill = 0;
+ u32 credit_max = 0;
+ u16 link_percentage = 0;
+ u8 bw_percent = 0;
+ u8 i;
+
+ if (dcb_config == NULL) {
+ ret_val = DCB_ERR_CONFIG;
+ goto out;
+ }
+
+ /* Find out the link percentage for each TC first */
+ for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+ p = &dcb_config->tc_config[i].path[direction];
+ bw_percent = dcb_config->bw_percentage[direction][p->bwg_id];
+
+ link_percentage = p->bwg_percent;
+ /* Must be careful of integer division for very small nums */
+ link_percentage = (link_percentage * bw_percent) / 100;
+ if (p->bwg_percent > 0 && link_percentage == 0)
+ link_percentage = 1;
+
+ /* Save link_percentage for reference */
+ p->link_percent = (u8)link_percentage;
+
+ /* Calculate credit refill and save it */
+ credit_refill = link_percentage * MINIMUM_CREDIT_REFILL;
+ p->data_credits_refill = (u16)credit_refill;
+
+ /* Calculate maximum credit for the TC */
+ credit_max = (link_percentage * MAX_CREDIT) / 100;
+
+ /*
+ * Adjustment based on rule checking, if the percentage
+ * of a TC is too small, the maximum credit may not be
+ * enough to send out a jumbo frame in data plane arbitration.
+ */
+ if (credit_max && (credit_max < MINIMUM_CREDIT_FOR_JUMBO))
+ credit_max = MINIMUM_CREDIT_FOR_JUMBO;
+
+ if (direction == DCB_TX_CONFIG) {
+ /*
+ * Adjustment based on rule checking, if the
+ * percentage of a TC is too small, the maximum
+ * credit may not be enough to send out a TSO
+ * packet in descriptor plane arbitration.
+ */
+ if (credit_max && (credit_max < MINIMUM_CREDIT_FOR_TSO))
+ credit_max = MINIMUM_CREDIT_FOR_TSO;
+
+ dcb_config->tc_config[i].desc_credits_max =
+ (u16)credit_max;
+ }
+
+ p->data_credits_max = (u16)credit_max;
+ }
+
+out:
+ return ret_val;
+}
+
+/**
+ * ixgbe_dcb_get_tc_stats - Returns status of 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(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats,
+ u8 tc_count)
+{
+ s32 ret = 0;
+ if (hw->mac.type == ixgbe_mac_82598EB)
+ ret = ixgbe_dcb_get_tc_stats_82598(hw, stats, tc_count);
+ return ret;
+}
+
+/**
+ * ixgbe_dcb_get_pfc_stats - Returns CBFC status of 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 CBFC status data for each of the Traffic Classes.
+ */
+s32 ixgbe_dcb_get_pfc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats,
+ u8 tc_count)
+{
+ s32 ret = 0;
+ if (hw->mac.type == ixgbe_mac_82598EB)
+ ret = ixgbe_dcb_get_pfc_stats_82598(hw, stats, tc_count);
+ return ret;
+}
+
+/**
+ * ixgbe_dcb_config_rx_arbiter - Config Rx arbiter
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Rx Data Arbiter and credits for each traffic class.
+ */
+s32 ixgbe_dcb_config_rx_arbiter(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ s32 ret = 0;
+ if (hw->mac.type == ixgbe_mac_82598EB)
+ ret = ixgbe_dcb_config_rx_arbiter_82598(hw, dcb_config);
+ return ret;
+}
+
+/**
+ * ixgbe_dcb_config_tx_desc_arbiter - 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(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ s32 ret = 0;
+ if (hw->mac.type == ixgbe_mac_82598EB)
+ ret = ixgbe_dcb_config_tx_desc_arbiter_82598(hw, dcb_config);
+ return ret;
+}
+
+/**
+ * ixgbe_dcb_config_tx_data_arbiter - Config Tx data arbiter
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Tx Data Arbiter and credits for each traffic class.
+ */
+s32 ixgbe_dcb_config_tx_data_arbiter(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ s32 ret = 0;
+ if (hw->mac.type == ixgbe_mac_82598EB)
+ ret = ixgbe_dcb_config_tx_data_arbiter_82598(hw, dcb_config);
+ return ret;
+}
+
+/**
+ * ixgbe_dcb_config_pfc - Config priority flow control
+ * @hw: pointer to hardware structure
+ * @dcb_config: pointer to ixgbe_dcb_config structure
+ *
+ * Configure Priority Flow Control for each traffic class.
+ */
+s32 ixgbe_dcb_config_pfc(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ s32 ret = 0;
+ if (hw->mac.type == ixgbe_mac_82598EB)
+ ret = ixgbe_dcb_config_pfc_82598(hw, dcb_config);
+ return ret;
+}
+
+/**
+ * ixgbe_dcb_config_tc_stats - 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(struct ixgbe_hw *hw)
+{
+ s32 ret = 0;
+ if (hw->mac.type == ixgbe_mac_82598EB)
+ ret = ixgbe_dcb_config_tc_stats_82598(hw);
+ return ret;
+}
+
+/**
+ * ixgbe_dcb_hw_config - Config 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(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config)
+{
+ s32 ret = 0;
+ if (hw->mac.type == ixgbe_mac_82598EB)
+ ret = ixgbe_dcb_hw_config_82598(hw, dcb_config);
+ return ret;
+}
diff -urpN -X dontdiff a/drivers/net/ixgbe/ixgbe_dcb.h
b/drivers/net/ixgbe/ixgbe_dcb.h
--- a/drivers/net/ixgbe/ixgbe_dcb.h 1969-12-31 16:00:00.000000000 -0800
+++ b/drivers/net/ixgbe/ixgbe_dcb.h 2009-01-22 11:33:59.000000000 -0800
@@ -0,0 +1,167 @@
+/*******************************************************************************
+
+ Intel 10 Gigabit PCI Express Linux driver
+ Copyright(c) 1999 - 2008 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@xxxxxxxxxxxxxxxxxxxxx>
+ Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#ifndef _DCB_CONFIG_H_
+#define _DCB_CONFIG_H_
+
+#include "ixgbe_type.h"
+
+/* DCB data structures */
+
+#define IXGBE_MAX_PACKET_BUFFERS 8
+#define MAX_USER_PRIORITY 8
+#define MAX_TRAFFIC_CLASS 8
+#define MAX_BW_GROUP 8
+#define BW_PERCENT 100
+
+#define DCB_TX_CONFIG 0
+#define DCB_RX_CONFIG 1
+
+/* DCB error Codes */
+#define DCB_SUCCESS 0
+#define DCB_ERR_CONFIG -1
+#define DCB_ERR_PARAM -2
+
+/* Transmit and receive Errors */
+/* Error in bandwidth group allocation */
+#define DCB_ERR_BW_GROUP -3
+/* Error in traffic class bandwidth allocation */
+#define DCB_ERR_TC_BW -4
+/* Traffic class has both link strict and group strict enabled */
+#define DCB_ERR_LS_GS -5
+/* Link strict traffic class has non zero bandwidth */
+#define DCB_ERR_LS_BW_NONZERO -6
+/* Link strict bandwidth group has non zero bandwidth */
+#define DCB_ERR_LS_BWG_NONZERO -7
+/* Traffic class has zero bandwidth */
+#define DCB_ERR_TC_BW_ZERO -8
+
+#define DCB_NOT_IMPLEMENTED 0x7FFFFFFF
+
+struct dcb_pfc_tc_debug {
+ u8 tc;
+ u8 pause_status;
+ u64 pause_quanta;
+};
+
+enum strict_prio_type {
+ prio_none = 0,
+ prio_group,
+ prio_link
+};
+
+/* Traffic class bandwidth allocation per direction */
+struct tc_bw_alloc {
+ u8 bwg_id; /* Bandwidth Group (BWG) ID */
+ u8 bwg_percent; /* % of BWG's bandwidth */
+ u8 link_percent; /* % of link bandwidth */
+ u8 up_to_tc_bitmap; /* User Priority to Traffic Class mapping */
+ u16 data_credits_refill; /* Credit refill amount in 64B granularity */
+ u16 data_credits_max; /* Max credits for a configured packet buffer
+ * in 64B granularity.*/
+ enum strict_prio_type prio_type; /* Link or Group Strict Priority */
+};
+
+enum dcb_pfc_type {
+ pfc_disabled = 0,
+ pfc_enabled_full,
+ pfc_enabled_tx,
+ pfc_enabled_rx
+};
+
+/* Traffic class configuration */
+struct tc_configuration {
+ struct tc_bw_alloc path[2]; /* One each for Tx/Rx */
+ enum dcb_pfc_type dcb_pfc; /* Class based flow control setting */
+
+ u16 desc_credits_max; /* For Tx Descriptor arbitration */
+ 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 ixgbe_dcb_config {
+ struct tc_configuration tc_config[MAX_TRAFFIC_CLASS];
+ u8 bw_percentage[2][MAX_BW_GROUP]; /* One each for Tx/Rx */
+ bool pfc_mode_enable;
+ bool round_robin_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 */
+};
+
+/* DCB driver APIs */
+
+/* DCB rule checking function.*/
+s32 ixgbe_dcb_check_config(struct ixgbe_dcb_config *config);
+
+/* DCB credits calculation */
+s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *config,
+ u8 direction);
+
+/* DCB PFC functions */
+s32 ixgbe_dcb_config_pfc(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config);
+s32 ixgbe_dcb_get_pfc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats,
+ u8 tc_count);
+
+/* DCB traffic class stats */
+s32 ixgbe_dcb_config_tc_stats(struct ixgbe_hw *);
+s32 ixgbe_dcb_get_tc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats,
+ u8 tc_count);
+
+/* DCB config arbiters */
+s32 ixgbe_dcb_config_tx_desc_arbiter(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config);
+s32 ixgbe_dcb_config_tx_data_arbiter(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config);
+s32 ixgbe_dcb_config_rx_arbiter(struct ixgbe_hw *hw,
+ struct ixgbe_dcb_config *dcb_config);
+
+/* DCB hw initialization */
+s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw, struct ixgbe_dcb_config *config);
+
+
+/* DCB definitions for credit calculation */
+#define MAX_CREDIT_REFILL 511 /* 0x1FF * 64B = 32704B */
+#define MINIMUM_CREDIT_REFILL 5 /* 5*64B = 320B */
+#define MINIMUM_CREDIT_FOR_JUMBO 145 /* 145 = UpperBound((9*1024+54)/64B)
+ * for 9KB jumbo frame */
+#define DCB_MAX_TSO_SIZE 32*1024 /* MAX TSO packet size supported
+ * in DCB mode */
+#define MINIMUM_CREDIT_FOR_TSO (DCB_MAX_TSO_SIZE/64 + 1) /* 513 for 32KB TSO
+ * packet */
+#define MAX_CREDIT 4095 /* Maximum credit supported:
+ * 256KB * 1204 / 64B */
+
+#endif /* _DCB_CONFIG_H */
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