151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
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/* Copyright 2020 NXP */
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#include "dpaa2-eth.h"
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static int dpaa2_eth_dcbnl_ieee_getpfc(struct net_device *net_dev,
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struct ieee_pfc *pfc)
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{
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struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
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if (!(priv->link_state.options & DPNI_LINK_OPT_PFC_PAUSE))
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return 0;
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memcpy(pfc, &priv->pfc, sizeof(priv->pfc));
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pfc->pfc_cap = dpaa2_eth_tc_count(priv);
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return 0;
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}
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static inline bool dpaa2_eth_is_prio_enabled(u8 pfc_en, u8 tc)
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{
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return !!(pfc_en & (1 << tc));
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}
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static int dpaa2_eth_set_pfc_cn(struct dpaa2_eth_priv *priv, u8 pfc_en)
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{
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struct dpni_congestion_notification_cfg cfg = {0};
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int i, err;
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cfg.notification_mode = DPNI_CONG_OPT_FLOW_CONTROL;
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cfg.units = DPNI_CONGESTION_UNIT_FRAMES;
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cfg.message_iova = 0ULL;
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cfg.message_ctx = 0ULL;
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for (i = 0; i < dpaa2_eth_tc_count(priv); i++) {
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if (dpaa2_eth_is_prio_enabled(pfc_en, i)) {
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cfg.threshold_entry = DPAA2_ETH_CN_THRESH_ENTRY(priv);
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cfg.threshold_exit = DPAA2_ETH_CN_THRESH_EXIT(priv);
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} else {
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/* For priorities not set in the pfc_en mask, we leave
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* the congestion thresholds at zero, which effectively
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* disables generation of PFC frames for them
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*/
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cfg.threshold_entry = 0;
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cfg.threshold_exit = 0;
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}
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err = dpni_set_congestion_notification(priv->mc_io, 0,
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priv->mc_token,
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DPNI_QUEUE_RX, i, &cfg);
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if (err) {
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netdev_err(priv->net_dev,
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"dpni_set_congestion_notification failed\n");
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return err;
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}
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}
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return 0;
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}
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static int dpaa2_eth_dcbnl_ieee_setpfc(struct net_device *net_dev,
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struct ieee_pfc *pfc)
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{
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struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
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struct dpni_link_cfg link_cfg = {0};
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bool tx_pause;
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int err;
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if (pfc->mbc || pfc->delay)
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return -EOPNOTSUPP;
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/* If same PFC enabled mask, nothing to do */
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if (priv->pfc.pfc_en == pfc->pfc_en)
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return 0;
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/* We allow PFC configuration even if it won't have any effect until
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* general pause frames are enabled
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*/
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tx_pause = dpaa2_eth_tx_pause_enabled(priv->link_state.options);
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if (!dpaa2_eth_rx_pause_enabled(priv->link_state.options) || !tx_pause)
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netdev_warn(net_dev, "Pause support must be enabled in order for PFC to work!\n");
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link_cfg.rate = priv->link_state.rate;
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link_cfg.options = priv->link_state.options;
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if (pfc->pfc_en)
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link_cfg.options |= DPNI_LINK_OPT_PFC_PAUSE;
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else
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link_cfg.options &= ~DPNI_LINK_OPT_PFC_PAUSE;
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err = dpni_set_link_cfg(priv->mc_io, 0, priv->mc_token, &link_cfg);
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if (err) {
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netdev_err(net_dev, "dpni_set_link_cfg failed\n");
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return err;
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}
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/* Configure congestion notifications for the enabled priorities */
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err = dpaa2_eth_set_pfc_cn(priv, pfc->pfc_en);
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if (err)
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return err;
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memcpy(&priv->pfc, pfc, sizeof(priv->pfc));
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priv->pfc_enabled = !!pfc->pfc_en;
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dpaa2_eth_set_rx_taildrop(priv, tx_pause, priv->pfc_enabled);
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return 0;
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}
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static u8 dpaa2_eth_dcbnl_getdcbx(struct net_device *net_dev)
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{
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struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
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return priv->dcbx_mode;
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}
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static u8 dpaa2_eth_dcbnl_setdcbx(struct net_device *net_dev, u8 mode)
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{
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struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
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return (mode != (priv->dcbx_mode)) ? 1 : 0;
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}
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static u8 dpaa2_eth_dcbnl_getcap(struct net_device *net_dev, int capid, u8 *cap)
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{
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struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
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switch (capid) {
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case DCB_CAP_ATTR_PFC:
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*cap = true;
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break;
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case DCB_CAP_ATTR_PFC_TCS:
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*cap = 1 << (dpaa2_eth_tc_count(priv) - 1);
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break;
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case DCB_CAP_ATTR_DCBX:
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*cap = priv->dcbx_mode;
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break;
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default:
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*cap = false;
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break;
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}
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return 0;
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}
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const struct dcbnl_rtnl_ops dpaa2_eth_dcbnl_ops = {
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.ieee_getpfc = dpaa2_eth_dcbnl_ieee_getpfc,
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.ieee_setpfc = dpaa2_eth_dcbnl_ieee_setpfc,
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.getdcbx = dpaa2_eth_dcbnl_getdcbx,
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.setdcbx = dpaa2_eth_dcbnl_setdcbx,
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.getcap = dpaa2_eth_dcbnl_getcap,
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};
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