9f801abc3d
This patch adds support for management of the limited QOS features of the FM10000 interface. Specifically we can support up to 8 traffic classes, however the part only provides 1 Rx and 1 Tx FIFO in the host interface and as a result this can lead to head-of-line blocking on Rx. This can be avoided by setting PFC only for priorities that cannot afford to drop frames. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Acked-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
174 lines
4.9 KiB
C
174 lines
4.9 KiB
C
/* Intel Ethernet Switch Host Interface Driver
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* Copyright(c) 2013 - 2014 Intel Corporation.
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*
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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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*
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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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*
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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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*
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* Contact Information:
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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 "fm10k.h"
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#ifdef CONFIG_DCB
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/**
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* fm10k_dcbnl_ieee_getets - get the ETS configuration for the device
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* @dev: netdev interface for the device
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* @ets: ETS structure to push configuration to
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**/
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static int fm10k_dcbnl_ieee_getets(struct net_device *dev, struct ieee_ets *ets)
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{
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int i;
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/* we support 8 TCs in all modes */
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ets->ets_cap = IEEE_8021QAZ_MAX_TCS;
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ets->cbs = 0;
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/* we only support strict priority and cannot do traffic shaping */
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memset(ets->tc_tx_bw, 0, sizeof(ets->tc_tx_bw));
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memset(ets->tc_rx_bw, 0, sizeof(ets->tc_rx_bw));
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memset(ets->tc_tsa, IEEE_8021QAZ_TSA_STRICT, sizeof(ets->tc_tsa));
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/* populate the prio map based on the netdev */
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for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
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ets->prio_tc[i] = netdev_get_prio_tc_map(dev, i);
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return 0;
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}
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/**
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* fm10k_dcbnl_ieee_setets - set the ETS configuration for the device
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* @dev: netdev interface for the device
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* @ets: ETS structure to pull configuration from
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**/
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static int fm10k_dcbnl_ieee_setets(struct net_device *dev, struct ieee_ets *ets)
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{
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u8 num_tc = 0;
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int i, err;
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/* verify type and determine num_tcs needed */
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for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
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if (ets->tc_tx_bw[i] || ets->tc_rx_bw[i])
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return -EINVAL;
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if (ets->tc_tsa[i] != IEEE_8021QAZ_TSA_STRICT)
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return -EINVAL;
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if (ets->prio_tc[i] > num_tc)
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num_tc = ets->prio_tc[i];
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}
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/* if requested TC is greater than 0 then num_tcs is max + 1 */
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if (num_tc)
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num_tc++;
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if (num_tc > IEEE_8021QAZ_MAX_TCS)
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return -EINVAL;
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/* update TC hardware mapping if necessary */
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if (num_tc != netdev_get_num_tc(dev)) {
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err = fm10k_setup_tc(dev, num_tc);
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if (err)
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return err;
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}
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/* update priority mapping */
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for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
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netdev_set_prio_tc_map(dev, i, ets->prio_tc[i]);
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return 0;
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}
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/**
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* fm10k_dcbnl_ieee_getpfc - get the PFC configuration for the device
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* @dev: netdev interface for the device
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* @pfc: PFC structure to push configuration to
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**/
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static int fm10k_dcbnl_ieee_getpfc(struct net_device *dev, struct ieee_pfc *pfc)
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{
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struct fm10k_intfc *interface = netdev_priv(dev);
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/* record flow control max count and state of TCs */
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pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS;
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pfc->pfc_en = interface->pfc_en;
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return 0;
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}
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/**
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* fm10k_dcbnl_ieee_setpfc - set the PFC configuration for the device
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* @dev: netdev interface for the device
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* @pfc: PFC structure to pull configuration from
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**/
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static int fm10k_dcbnl_ieee_setpfc(struct net_device *dev, struct ieee_pfc *pfc)
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{
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struct fm10k_intfc *interface = netdev_priv(dev);
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/* record PFC configuration to interface */
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interface->pfc_en = pfc->pfc_en;
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/* if we are running update the drop_en state for all queues */
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if (netif_running(dev))
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fm10k_update_rx_drop_en(interface);
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return 0;
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}
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/**
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* fm10k_dcbnl_ieee_getdcbx - get the DCBX configuration for the device
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* @dev: netdev interface for the device
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*
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* Returns that we support only IEEE DCB for this interface
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**/
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static u8 fm10k_dcbnl_getdcbx(struct net_device *dev)
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{
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return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
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}
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/**
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* fm10k_dcbnl_ieee_setdcbx - get the DCBX configuration for the device
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* @dev: netdev interface for the device
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* @mode: new mode for this device
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*
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* Returns error on attempt to enable anything but IEEE DCB for this interface
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**/
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static u8 fm10k_dcbnl_setdcbx(struct net_device *dev, u8 mode)
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{
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return (mode != (DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE)) ? 1 : 0;
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}
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static const struct dcbnl_rtnl_ops fm10k_dcbnl_ops = {
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.ieee_getets = fm10k_dcbnl_ieee_getets,
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.ieee_setets = fm10k_dcbnl_ieee_setets,
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.ieee_getpfc = fm10k_dcbnl_ieee_getpfc,
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.ieee_setpfc = fm10k_dcbnl_ieee_setpfc,
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.getdcbx = fm10k_dcbnl_getdcbx,
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.setdcbx = fm10k_dcbnl_setdcbx,
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};
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#endif /* CONFIG_DCB */
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/**
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* fm10k_dcbnl_set_ops - Configures dcbnl ops pointer for netdev
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* @dev: netdev interface for the device
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*
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* Enables PF for DCB by assigning DCBNL ops pointer.
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**/
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void fm10k_dcbnl_set_ops(struct net_device *dev)
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{
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#ifdef CONFIG_DCB
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struct fm10k_intfc *interface = netdev_priv(dev);
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struct fm10k_hw *hw = &interface->hw;
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if (hw->mac.type == fm10k_mac_pf)
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dev->dcbnl_ops = &fm10k_dcbnl_ops;
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#endif /* CONFIG_DCB */
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}
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