LXR linux/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth-dcb.c

   1// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
   2/* Copyright 2020 NXP */
   3
   4#include "dpaa2-eth.h"
   5
   6static int dpaa2_eth_dcbnl_ieee_getpfc(struct net_device *net_dev,
   7                                       struct ieee_pfc *pfc)
   8{
   9        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
  10
  11        if (!(priv->link_state.options & DPNI_LINK_OPT_PFC_PAUSE))
  12                return 0;
  13
  14        memcpy(pfc, &priv->pfc, sizeof(priv->pfc));
  15        pfc->pfc_cap = dpaa2_eth_tc_count(priv);
  16
  17        return 0;
  18}
  19
  20static inline bool dpaa2_eth_is_prio_enabled(u8 pfc_en, u8 tc)
  21{
  22        return !!(pfc_en & (1 << tc));
  23}
  24
  25static int dpaa2_eth_set_pfc_cn(struct dpaa2_eth_priv *priv, u8 pfc_en)
  26{
  27        struct dpni_congestion_notification_cfg cfg = {0};
  28        int i, err;
  29
  30        cfg.notification_mode = DPNI_CONG_OPT_FLOW_CONTROL;
  31        cfg.units = DPNI_CONGESTION_UNIT_FRAMES;
  32        cfg.message_iova = 0ULL;
  33        cfg.message_ctx = 0ULL;
  34
  35        for (i = 0; i < dpaa2_eth_tc_count(priv); i++) {
  36                if (dpaa2_eth_is_prio_enabled(pfc_en, i)) {
  37                        cfg.threshold_entry = DPAA2_ETH_CN_THRESH_ENTRY(priv);
  38                        cfg.threshold_exit = DPAA2_ETH_CN_THRESH_EXIT(priv);
  39                } else {
  40                        /* For priorities not set in the pfc_en mask, we leave
  41                         * the congestion thresholds at zero, which effectively
  42                         * disables generation of PFC frames for them
  43                         */
  44                        cfg.threshold_entry = 0;
  45                        cfg.threshold_exit = 0;
  46                }
  47
  48                err = dpni_set_congestion_notification(priv->mc_io, 0,
  49                                                       priv->mc_token,
  50                                                       DPNI_QUEUE_RX, i, &cfg);
  51                if (err) {
  52                        netdev_err(priv->net_dev,
  53                                   "dpni_set_congestion_notification failed\n");
  54                        return err;
  55                }
  56        }
  57
  58        return 0;
  59}
  60
  61static int dpaa2_eth_dcbnl_ieee_setpfc(struct net_device *net_dev,
  62                                       struct ieee_pfc *pfc)
  63{
  64        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
  65        struct dpni_link_cfg link_cfg = {0};
  66        bool tx_pause;
  67        int err;
  68
  69        if (pfc->mbc || pfc->delay)
  70                return -EOPNOTSUPP;
  71
  72        /* If same PFC enabled mask, nothing to do */
  73        if (priv->pfc.pfc_en == pfc->pfc_en)
  74                return 0;
  75
  76        /* We allow PFC configuration even if it won't have any effect until
  77         * general pause frames are enabled
  78         */
  79        tx_pause = dpaa2_eth_tx_pause_enabled(priv->link_state.options);
  80        if (!dpaa2_eth_rx_pause_enabled(priv->link_state.options) || !tx_pause)
  81                netdev_warn(net_dev, "Pause support must be enabled in order for PFC to work!\n");
  82
  83        link_cfg.rate = priv->link_state.rate;
  84        link_cfg.options = priv->link_state.options;
  85        if (pfc->pfc_en)
  86                link_cfg.options |= DPNI_LINK_OPT_PFC_PAUSE;
  87        else
  88                link_cfg.options &= ~DPNI_LINK_OPT_PFC_PAUSE;
  89        err = dpni_set_link_cfg(priv->mc_io, 0, priv->mc_token, &link_cfg);
  90        if (err) {
  91                netdev_err(net_dev, "dpni_set_link_cfg failed\n");
  92                return err;
  93        }
  94
  95        /* Configure congestion notifications for the enabled priorities */
  96        err = dpaa2_eth_set_pfc_cn(priv, pfc->pfc_en);
  97        if (err)
  98                return err;
  99
 100        memcpy(&priv->pfc, pfc, sizeof(priv->pfc));
 101        priv->pfc_enabled = !!pfc->pfc_en;
 102
 103        dpaa2_eth_set_rx_taildrop(priv, tx_pause, priv->pfc_enabled);
 104
 105        return 0;
 106}
 107
 108static u8 dpaa2_eth_dcbnl_getdcbx(struct net_device *net_dev)
 109{
 110        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
 111
 112        return priv->dcbx_mode;
 113}
 114
 115static u8 dpaa2_eth_dcbnl_setdcbx(struct net_device *net_dev, u8 mode)
 116{
 117        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
 118
 119        return (mode != (priv->dcbx_mode)) ? 1 : 0;
 120}
 121
 122static u8 dpaa2_eth_dcbnl_getcap(struct net_device *net_dev, int capid, u8 *cap)
 123{
 124        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
 125
 126        switch (capid) {
 127        case DCB_CAP_ATTR_PFC:
 128                *cap = true;
 129                break;
 130        case DCB_CAP_ATTR_PFC_TCS:
 131                *cap = 1 << (dpaa2_eth_tc_count(priv) - 1);
 132                break;
 133        case DCB_CAP_ATTR_DCBX:
 134                *cap = priv->dcbx_mode;
 135                break;
 136        default:
 137                *cap = false;
 138                break;
 139        }
 140
 141        return 0;
 142}
 143
 144const struct dcbnl_rtnl_ops dpaa2_eth_dcbnl_ops = {
 145        .ieee_getpfc    = dpaa2_eth_dcbnl_ieee_getpfc,
 146        .ieee_setpfc    = dpaa2_eth_dcbnl_ieee_setpfc,
 147        .getdcbx        = dpaa2_eth_dcbnl_getdcbx,
 148        .setdcbx        = dpaa2_eth_dcbnl_setdcbx,
 149        .getcap         = dpaa2_eth_dcbnl_getcap,
 150};
 151