859ee3c438
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>
184 lines
6.3 KiB
C
184 lines
6.3 KiB
C
/*******************************************************************************
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Intel 10 Gigabit PCI Express Linux driver
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Copyright(c) 1999 - 2007 Intel Corporation.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Contact Information:
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Linux NICS <linux.nics@intel.com>
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e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
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Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*******************************************************************************/
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#ifndef _DCB_CONFIG_H_
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#define _DCB_CONFIG_H_
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#include "ixgbe_type.h"
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/* DCB data structures */
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#define IXGBE_MAX_PACKET_BUFFERS 8
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#define MAX_USER_PRIORITY 8
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#define MAX_TRAFFIC_CLASS 8
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#define MAX_BW_GROUP 8
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#define BW_PERCENT 100
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#define DCB_TX_CONFIG 0
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#define DCB_RX_CONFIG 1
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/* DCB error Codes */
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#define DCB_SUCCESS 0
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#define DCB_ERR_CONFIG -1
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#define DCB_ERR_PARAM -2
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/* Transmit and receive Errors */
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/* Error in bandwidth group allocation */
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#define DCB_ERR_BW_GROUP -3
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/* Error in traffic class bandwidth allocation */
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#define DCB_ERR_TC_BW -4
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/* Traffic class has both link strict and group strict enabled */
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#define DCB_ERR_LS_GS -5
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/* Link strict traffic class has non zero bandwidth */
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#define DCB_ERR_LS_BW_NONZERO -6
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/* Link strict bandwidth group has non zero bandwidth */
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#define DCB_ERR_LS_BWG_NONZERO -7
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/* Traffic class has zero bandwidth */
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#define DCB_ERR_TC_BW_ZERO -8
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#define DCB_NOT_IMPLEMENTED 0x7FFFFFFF
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struct dcb_pfc_tc_debug {
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u8 tc;
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u8 pause_status;
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u64 pause_quanta;
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};
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enum strict_prio_type {
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prio_none = 0,
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prio_group,
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prio_link
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};
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/* Traffic class bandwidth allocation per direction */
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struct tc_bw_alloc {
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u8 bwg_id; /* Bandwidth Group (BWG) ID */
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u8 bwg_percent; /* % of BWG's bandwidth */
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u8 link_percent; /* % of link bandwidth */
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u8 up_to_tc_bitmap; /* User Priority to Traffic Class mapping */
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u16 data_credits_refill; /* Credit refill amount in 64B granularity */
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u16 data_credits_max; /* Max credits for a configured packet buffer
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* in 64B granularity.*/
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enum strict_prio_type prio_type; /* Link or Group Strict Priority */
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};
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enum dcb_pfc_type {
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pfc_disabled = 0,
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pfc_enabled_full,
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pfc_enabled_tx,
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pfc_enabled_rx
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};
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/* Traffic class configuration */
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struct tc_configuration {
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struct tc_bw_alloc path[2]; /* One each for Tx/Rx */
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enum dcb_pfc_type dcb_pfc; /* Class based flow control setting */
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u16 desc_credits_max; /* For Tx Descriptor arbitration */
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u8 tc; /* Traffic class (TC) */
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};
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enum dcb_rx_pba_cfg {
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pba_equal, /* PBA[0-7] each use 64KB FIFO */
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pba_80_48 /* PBA[0-3] each use 80KB, PBA[4-7] each use 48KB */
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};
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/*
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* This structure contains many values encoded as fixed-point
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* numbers, meaning that some of bits are dedicated to the
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* magnitude and others to the fraction part. In the comments
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* this is shown as f=n, where n is the number of fraction bits.
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* These fraction bits are always the low-order bits. The size
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* of the magnitude is not specified.
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*/
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struct bcn_config {
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u32 rp_admin_mode[MAX_TRAFFIC_CLASS]; /* BCN enabled, per TC */
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u32 bcna_option[2]; /* BCNA Port + MAC Addr */
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u32 rp_w; /* Derivative Weight, f=3 */
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u32 rp_gi; /* Increase Gain, f=12 */
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u32 rp_gd; /* Decrease Gain, f=12 */
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u32 rp_ru; /* Rate Unit */
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u32 rp_alpha; /* Max Decrease Factor, f=12 */
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u32 rp_beta; /* Max Increase Factor, f=12 */
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u32 rp_ri; /* Initial Rate */
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u32 rp_td; /* Drift Interval Timer */
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u32 rp_rd; /* Drift Increase */
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u32 rp_tmax; /* Severe Congestion Backoff Timer Range */
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u32 rp_rmin; /* Severe Congestion Restart Rate */
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u32 rp_wrtt; /* RTT Moving Average Weight */
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};
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struct ixgbe_dcb_config {
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struct bcn_config bcn;
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struct tc_configuration tc_config[MAX_TRAFFIC_CLASS];
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u8 bw_percentage[2][MAX_BW_GROUP]; /* One each for Tx/Rx */
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bool round_robin_enable;
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enum dcb_rx_pba_cfg rx_pba_cfg;
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u32 dcb_cfg_version; /* Not used...OS-specific? */
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u32 link_speed; /* For bandwidth allocation validation purpose */
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};
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/* DCB driver APIs */
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/* DCB rule checking function.*/
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s32 ixgbe_dcb_check_config(struct ixgbe_dcb_config *config);
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/* DCB credits calculation */
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s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *, u8);
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/* DCB PFC functions */
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s32 ixgbe_dcb_config_pfc(struct ixgbe_hw *, struct ixgbe_dcb_config *g);
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s32 ixgbe_dcb_get_pfc_stats(struct ixgbe_hw *, struct ixgbe_hw_stats *, u8);
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/* DCB traffic class stats */
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s32 ixgbe_dcb_config_tc_stats(struct ixgbe_hw *);
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s32 ixgbe_dcb_get_tc_stats(struct ixgbe_hw *, struct ixgbe_hw_stats *, u8);
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/* DCB config arbiters */
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s32 ixgbe_dcb_config_tx_desc_arbiter(struct ixgbe_hw *,
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struct ixgbe_dcb_config *);
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s32 ixgbe_dcb_config_tx_data_arbiter(struct ixgbe_hw *,
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struct ixgbe_dcb_config *);
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s32 ixgbe_dcb_config_rx_arbiter(struct ixgbe_hw *, struct ixgbe_dcb_config *);
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/* DCB hw initialization */
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s32 ixgbe_dcb_hw_config(struct ixgbe_hw *, struct ixgbe_dcb_config *);
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/* DCB definitions for credit calculation */
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#define MAX_CREDIT_REFILL 511 /* 0x1FF * 64B = 32704B */
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#define MINIMUM_CREDIT_REFILL 5 /* 5*64B = 320B */
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#define MINIMUM_CREDIT_FOR_JUMBO 145 /* 145= UpperBound((9*1024+54)/64B) for 9KB jumbo frame */
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#define DCB_MAX_TSO_SIZE (32*1024) /* MAX TSO packet size supported in DCB mode */
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#define MINIMUM_CREDIT_FOR_TSO (DCB_MAX_TSO_SIZE/64 + 1) /* 513 for 32KB TSO packet */
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#define MAX_CREDIT 4095 /* Maximum credit supported: 256KB * 1204 / 64B */
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#endif /* _DCB_CONFIG_H */
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