linux/drivers/net/ethernet/intel/fm10k/fm10k_dcbnl.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright(c) 2013 - 2019 Intel Corporation. */
   3
   4#include "fm10k.h"
   5
   6/**
   7 * fm10k_dcbnl_ieee_getets - get the ETS configuration for the device
   8 * @dev: netdev interface for the device
   9 * @ets: ETS structure to push configuration to
  10 **/
  11static int fm10k_dcbnl_ieee_getets(struct net_device *dev, struct ieee_ets *ets)
  12{
  13        int i;
  14
  15        /* we support 8 TCs in all modes */
  16        ets->ets_cap = IEEE_8021QAZ_MAX_TCS;
  17        ets->cbs = 0;
  18
  19        /* we only support strict priority and cannot do traffic shaping */
  20        memset(ets->tc_tx_bw, 0, sizeof(ets->tc_tx_bw));
  21        memset(ets->tc_rx_bw, 0, sizeof(ets->tc_rx_bw));
  22        memset(ets->tc_tsa, IEEE_8021QAZ_TSA_STRICT, sizeof(ets->tc_tsa));
  23
  24        /* populate the prio map based on the netdev */
  25        for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
  26                ets->prio_tc[i] = netdev_get_prio_tc_map(dev, i);
  27
  28        return 0;
  29}
  30
  31/**
  32 * fm10k_dcbnl_ieee_setets - set the ETS configuration for the device
  33 * @dev: netdev interface for the device
  34 * @ets: ETS structure to pull configuration from
  35 **/
  36static int fm10k_dcbnl_ieee_setets(struct net_device *dev, struct ieee_ets *ets)
  37{
  38        u8 num_tc = 0;
  39        int i;
  40
  41        /* verify type and determine num_tcs needed */
  42        for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
  43                if (ets->tc_tx_bw[i] || ets->tc_rx_bw[i])
  44                        return -EINVAL;
  45                if (ets->tc_tsa[i] != IEEE_8021QAZ_TSA_STRICT)
  46                        return -EINVAL;
  47                if (ets->prio_tc[i] > num_tc)
  48                        num_tc = ets->prio_tc[i];
  49        }
  50
  51        /* if requested TC is greater than 0 then num_tcs is max + 1 */
  52        if (num_tc)
  53                num_tc++;
  54
  55        if (num_tc > IEEE_8021QAZ_MAX_TCS)
  56                return -EINVAL;
  57
  58        /* update TC hardware mapping if necessary */
  59        if (num_tc != netdev_get_num_tc(dev)) {
  60                int err = fm10k_setup_tc(dev, num_tc);
  61                if (err)
  62                        return err;
  63        }
  64
  65        /* update priority mapping */
  66        for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
  67                netdev_set_prio_tc_map(dev, i, ets->prio_tc[i]);
  68
  69        return 0;
  70}
  71
  72/**
  73 * fm10k_dcbnl_ieee_getpfc - get the PFC configuration for the device
  74 * @dev: netdev interface for the device
  75 * @pfc: PFC structure to push configuration to
  76 **/
  77static int fm10k_dcbnl_ieee_getpfc(struct net_device *dev, struct ieee_pfc *pfc)
  78{
  79        struct fm10k_intfc *interface = netdev_priv(dev);
  80
  81        /* record flow control max count and state of TCs */
  82        pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS;
  83        pfc->pfc_en = interface->pfc_en;
  84
  85        return 0;
  86}
  87
  88/**
  89 * fm10k_dcbnl_ieee_setpfc - set the PFC configuration for the device
  90 * @dev: netdev interface for the device
  91 * @pfc: PFC structure to pull configuration from
  92 **/
  93static int fm10k_dcbnl_ieee_setpfc(struct net_device *dev, struct ieee_pfc *pfc)
  94{
  95        struct fm10k_intfc *interface = netdev_priv(dev);
  96
  97        /* record PFC configuration to interface */
  98        interface->pfc_en = pfc->pfc_en;
  99
 100        /* if we are running update the drop_en state for all queues */
 101        if (netif_running(dev))
 102                fm10k_update_rx_drop_en(interface);
 103
 104        return 0;
 105}
 106
 107/**
 108 * fm10k_dcbnl_getdcbx - get the DCBX configuration for the device
 109 * @dev: netdev interface for the device
 110 *
 111 * Returns that we support only IEEE DCB for this interface
 112 **/
 113static u8 fm10k_dcbnl_getdcbx(struct net_device __always_unused *dev)
 114{
 115        return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
 116}
 117
 118/**
 119 * fm10k_dcbnl_setdcbx - get the DCBX configuration for the device
 120 * @dev: netdev interface for the device
 121 * @mode: new mode for this device
 122 *
 123 * Returns error on attempt to enable anything but IEEE DCB for this interface
 124 **/
 125static u8 fm10k_dcbnl_setdcbx(struct net_device __always_unused *dev, u8 mode)
 126{
 127        return (mode != (DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE)) ? 1 : 0;
 128}
 129
 130static const struct dcbnl_rtnl_ops fm10k_dcbnl_ops = {
 131        .ieee_getets    = fm10k_dcbnl_ieee_getets,
 132        .ieee_setets    = fm10k_dcbnl_ieee_setets,
 133        .ieee_getpfc    = fm10k_dcbnl_ieee_getpfc,
 134        .ieee_setpfc    = fm10k_dcbnl_ieee_setpfc,
 135
 136        .getdcbx        = fm10k_dcbnl_getdcbx,
 137        .setdcbx        = fm10k_dcbnl_setdcbx,
 138};
 139
 140/**
 141 * fm10k_dcbnl_set_ops - Configures dcbnl ops pointer for netdev
 142 * @dev: netdev interface for the device
 143 *
 144 * Enables PF for DCB by assigning DCBNL ops pointer.
 145 **/
 146void fm10k_dcbnl_set_ops(struct net_device *dev)
 147{
 148        struct fm10k_intfc *interface = netdev_priv(dev);
 149        struct fm10k_hw *hw = &interface->hw;
 150
 151        if (hw->mac.type == fm10k_mac_pf)
 152                dev->dcbnl_ops = &fm10k_dcbnl_ops;
 153}
 154