323 lines
9.0 KiB
C
323 lines
9.0 KiB
C
/*******************************************************************************
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Intel 10 Gigabit PCI Express Linux driver
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Copyright(c) 1999 - 2011 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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#include "ixgbe.h"
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#include "ixgbe_type.h"
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#include "ixgbe_dcb.h"
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#include "ixgbe_dcb_82598.h"
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#include "ixgbe_dcb_82599.h"
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/**
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* ixgbe_ieee_credits - This calculates the ieee traffic class
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* credits from the configured bandwidth percentages. Credits
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* are the smallest unit programmable into the underlying
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* hardware. The IEEE 802.1Qaz specification do not use bandwidth
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* groups so this is much simplified from the CEE case.
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*/
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s32 ixgbe_ieee_credits(__u8 *bw, __u16 *refill, __u16 *max, int max_frame)
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{
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int min_percent = 100;
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int min_credit, multiplier;
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int i;
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min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) /
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DCB_CREDIT_QUANTUM;
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
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if (bw[i] < min_percent && bw[i])
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min_percent = bw[i];
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}
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multiplier = (min_credit / min_percent) + 1;
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/* Find out the hw credits for each TC */
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
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int val = min(bw[i] * multiplier, MAX_CREDIT_REFILL);
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if (val < min_credit)
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val = min_credit;
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refill[i] = val;
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max[i] = bw[i] ? (bw[i] * MAX_CREDIT)/100 : min_credit;
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}
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return 0;
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}
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/**
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* ixgbe_dcb_calculate_tc_credits - Calculates traffic class credits
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* @ixgbe_dcb_config: Struct containing DCB settings.
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* @direction: Configuring either Tx or Rx.
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*
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* This function calculates the credits allocated to each traffic class.
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* It should be called only after the rules are checked by
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* ixgbe_dcb_check_config().
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*/
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s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *hw,
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struct ixgbe_dcb_config *dcb_config,
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int max_frame, u8 direction)
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{
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struct tc_bw_alloc *p;
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int min_credit;
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int min_multiplier;
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int min_percent = 100;
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s32 ret_val = 0;
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/* Initialization values default for Tx settings */
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u32 credit_refill = 0;
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u32 credit_max = 0;
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u16 link_percentage = 0;
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u8 bw_percent = 0;
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u8 i;
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if (dcb_config == NULL) {
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ret_val = DCB_ERR_CONFIG;
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goto out;
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}
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min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) /
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DCB_CREDIT_QUANTUM;
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/* Find smallest link percentage */
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
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p = &dcb_config->tc_config[i].path[direction];
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bw_percent = dcb_config->bw_percentage[direction][p->bwg_id];
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link_percentage = p->bwg_percent;
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link_percentage = (link_percentage * bw_percent) / 100;
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if (link_percentage && link_percentage < min_percent)
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min_percent = link_percentage;
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}
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/*
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* The ratio between traffic classes will control the bandwidth
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* percentages seen on the wire. To calculate this ratio we use
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* a multiplier. It is required that the refill credits must be
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* larger than the max frame size so here we find the smallest
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* multiplier that will allow all bandwidth percentages to be
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* greater than the max frame size.
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*/
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min_multiplier = (min_credit / min_percent) + 1;
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/* Find out the link percentage for each TC first */
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
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p = &dcb_config->tc_config[i].path[direction];
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bw_percent = dcb_config->bw_percentage[direction][p->bwg_id];
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link_percentage = p->bwg_percent;
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/* Must be careful of integer division for very small nums */
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link_percentage = (link_percentage * bw_percent) / 100;
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if (p->bwg_percent > 0 && link_percentage == 0)
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link_percentage = 1;
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/* Save link_percentage for reference */
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p->link_percent = (u8)link_percentage;
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/* Calculate credit refill ratio using multiplier */
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credit_refill = min(link_percentage * min_multiplier,
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MAX_CREDIT_REFILL);
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p->data_credits_refill = (u16)credit_refill;
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/* Calculate maximum credit for the TC */
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credit_max = (link_percentage * MAX_CREDIT) / 100;
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/*
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* Adjustment based on rule checking, if the percentage
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* of a TC is too small, the maximum credit may not be
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* enough to send out a jumbo frame in data plane arbitration.
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*/
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if (credit_max && (credit_max < min_credit))
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credit_max = min_credit;
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if (direction == DCB_TX_CONFIG) {
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/*
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* Adjustment based on rule checking, if the
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* percentage of a TC is too small, the maximum
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* credit may not be enough to send out a TSO
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* packet in descriptor plane arbitration.
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*/
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if ((hw->mac.type == ixgbe_mac_82598EB) &&
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credit_max &&
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(credit_max < MINIMUM_CREDIT_FOR_TSO))
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credit_max = MINIMUM_CREDIT_FOR_TSO;
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dcb_config->tc_config[i].desc_credits_max =
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(u16)credit_max;
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}
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p->data_credits_max = (u16)credit_max;
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}
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out:
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return ret_val;
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}
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void ixgbe_dcb_unpack_pfc(struct ixgbe_dcb_config *cfg, u8 *pfc_en)
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{
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int i;
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*pfc_en = 0;
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
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*pfc_en |= (cfg->tc_config[i].dcb_pfc & 0xF) << i;
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}
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void ixgbe_dcb_unpack_refill(struct ixgbe_dcb_config *cfg, int direction,
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u16 *refill)
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{
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struct tc_bw_alloc *p;
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int i;
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
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p = &cfg->tc_config[i].path[direction];
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refill[i] = p->data_credits_refill;
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}
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}
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void ixgbe_dcb_unpack_max(struct ixgbe_dcb_config *cfg, u16 *max)
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{
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int i;
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
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max[i] = cfg->tc_config[i].desc_credits_max;
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}
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void ixgbe_dcb_unpack_bwgid(struct ixgbe_dcb_config *cfg, int direction,
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u8 *bwgid)
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{
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struct tc_bw_alloc *p;
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int i;
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
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p = &cfg->tc_config[i].path[direction];
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bwgid[i] = p->bwg_id;
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}
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}
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void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *cfg, int direction,
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u8 *ptype)
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{
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struct tc_bw_alloc *p;
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int i;
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for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
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p = &cfg->tc_config[i].path[direction];
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ptype[i] = p->prio_type;
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}
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}
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/**
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* ixgbe_dcb_hw_config - Config and enable DCB
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* @hw: pointer to hardware structure
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* @dcb_config: pointer to ixgbe_dcb_config structure
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*
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* Configure dcb settings and enable dcb mode.
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*/
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s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw,
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struct ixgbe_dcb_config *dcb_config)
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{
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s32 ret = 0;
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u8 pfc_en;
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u8 ptype[MAX_TRAFFIC_CLASS];
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u8 bwgid[MAX_TRAFFIC_CLASS];
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u16 refill[MAX_TRAFFIC_CLASS];
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u16 max[MAX_TRAFFIC_CLASS];
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/* CEE does not define a priority to tc mapping so map 1:1 */
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u8 prio_tc[MAX_TRAFFIC_CLASS] = {0, 1, 2, 3, 4, 5, 6, 7};
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/* Unpack CEE standard containers */
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ixgbe_dcb_unpack_pfc(dcb_config, &pfc_en);
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ixgbe_dcb_unpack_refill(dcb_config, DCB_TX_CONFIG, refill);
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ixgbe_dcb_unpack_max(dcb_config, max);
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ixgbe_dcb_unpack_bwgid(dcb_config, DCB_TX_CONFIG, bwgid);
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ixgbe_dcb_unpack_prio(dcb_config, DCB_TX_CONFIG, ptype);
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switch (hw->mac.type) {
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case ixgbe_mac_82598EB:
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ret = ixgbe_dcb_hw_config_82598(hw, dcb_config->rx_pba_cfg,
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pfc_en, refill, max, bwgid,
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ptype);
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break;
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case ixgbe_mac_82599EB:
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case ixgbe_mac_X540:
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ret = ixgbe_dcb_hw_config_82599(hw, dcb_config->rx_pba_cfg,
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pfc_en, refill, max, bwgid,
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ptype, prio_tc);
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break;
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default:
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break;
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}
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return ret;
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}
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/* Helper routines to abstract HW specifics from DCB netlink ops */
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s32 ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en)
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{
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int ret = -EINVAL;
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switch (hw->mac.type) {
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case ixgbe_mac_82598EB:
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ret = ixgbe_dcb_config_pfc_82598(hw, pfc_en);
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break;
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case ixgbe_mac_82599EB:
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case ixgbe_mac_X540:
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ret = ixgbe_dcb_config_pfc_82599(hw, pfc_en);
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break;
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default:
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break;
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}
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return ret;
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}
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s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw,
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u16 *refill, u16 *max, u8 *bwg_id,
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u8 *prio_type, u8 *prio_tc)
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{
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switch (hw->mac.type) {
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case ixgbe_mac_82598EB:
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ixgbe_dcb_config_rx_arbiter_82598(hw, refill, max,
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prio_type);
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ixgbe_dcb_config_tx_desc_arbiter_82598(hw, refill, max,
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bwg_id, prio_type);
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ixgbe_dcb_config_tx_data_arbiter_82598(hw, refill, max,
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bwg_id, prio_type);
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break;
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case ixgbe_mac_82599EB:
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case ixgbe_mac_X540:
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ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max,
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bwg_id, prio_type, prio_tc);
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ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max,
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bwg_id, prio_type);
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ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max, bwg_id,
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prio_type, prio_tc);
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break;
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default:
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break;
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}
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return 0;
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}
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