+
+int
+rte_pmd_i40e_set_tc_strict_prio(uint8_t port, uint8_t tc_map)
+{
+ struct rte_eth_dev *dev;
+ struct i40e_pf *pf;
+ struct i40e_vsi *vsi;
+ struct i40e_veb *veb;
+ struct i40e_hw *hw;
+ struct i40e_aqc_configure_switching_comp_ets_data ets_data;
+ int i;
+ int ret;
+
+ RTE_ETH_VALID_PORTID_OR_ERR_RET(port, -ENODEV);
+
+ dev = &rte_eth_devices[port];
+
+ if (!is_device_supported(dev, &rte_i40e_pmd))
+ return -ENOTSUP;
+
+ pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
+
+ vsi = pf->main_vsi;
+ if (!vsi) {
+ PMD_DRV_LOG(ERR, "Invalid VSI.");
+ return -EINVAL;
+ }
+
+ veb = vsi->veb;
+ if (!veb) {
+ PMD_DRV_LOG(ERR, "Invalid VEB.");
+ return -EINVAL;
+ }
+
+ if ((tc_map & veb->enabled_tc) != tc_map) {
+ PMD_DRV_LOG(ERR,
+ "TC bitmap isn't the subset of enabled TCs 0x%x.",
+ veb->enabled_tc);
+ return -EINVAL;
+ }
+
+ if (tc_map == veb->strict_prio_tc) {
+ PMD_DRV_LOG(INFO, "No change for TC bitmap. Nothing to do.");
+ return 0;
+ }
+
+ hw = I40E_VSI_TO_HW(vsi);
+
+ /* Disable DCBx if it's the first time to set strict priority. */
+ if (!veb->strict_prio_tc) {
+ ret = i40e_aq_stop_lldp(hw, true, NULL);
+ if (ret)
+ PMD_DRV_LOG(INFO,
+ "Failed to disable DCBx as it's already"
+ " disabled.");
+ else
+ PMD_DRV_LOG(INFO,
+ "DCBx is disabled according to strict"
+ " priority setting.");
+ }
+
+ memset(&ets_data, 0, sizeof(ets_data));
+ ets_data.tc_valid_bits = veb->enabled_tc;
+ ets_data.seepage = I40E_AQ_ETS_SEEPAGE_EN_MASK;
+ ets_data.tc_strict_priority_flags = tc_map;
+ /* Get all TCs' bandwidth. */
+ for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
+ if (veb->enabled_tc & BIT_ULL(i)) {
+ /* For rubust, if bandwidth is 0, use 1 instead. */
+ if (veb->bw_info.bw_ets_share_credits[i])
+ ets_data.tc_bw_share_credits[i] =
+ veb->bw_info.bw_ets_share_credits[i];
+ else
+ ets_data.tc_bw_share_credits[i] =
+ I40E_QOS_BW_WEIGHT_MIN;
+ }
+ }
+
+ if (!veb->strict_prio_tc)
+ ret = i40e_aq_config_switch_comp_ets(
+ hw, veb->uplink_seid,
+ &ets_data, i40e_aqc_opc_enable_switching_comp_ets,
+ NULL);
+ else if (tc_map)
+ ret = i40e_aq_config_switch_comp_ets(
+ hw, veb->uplink_seid,
+ &ets_data, i40e_aqc_opc_modify_switching_comp_ets,
+ NULL);
+ else
+ ret = i40e_aq_config_switch_comp_ets(
+ hw, veb->uplink_seid,
+ &ets_data, i40e_aqc_opc_disable_switching_comp_ets,
+ NULL);
+
+ if (ret) {
+ PMD_DRV_LOG(ERR,
+ "Failed to set TCs' strict priority mode."
+ " err (%d)", ret);
+ return -EINVAL;
+ }
+
+ veb->strict_prio_tc = tc_map;
+
+ /* Enable DCBx again, if all the TCs' strict priority disabled. */
+ if (!tc_map) {
+ ret = i40e_aq_start_lldp(hw, NULL);
+ if (ret) {
+ PMD_DRV_LOG(ERR,
+ "Failed to enable DCBx, err(%d).", ret);
+ return -EINVAL;
+ }
+
+ PMD_DRV_LOG(INFO,
+ "DCBx is enabled again according to strict"
+ " priority setting.");
+ }
+
+ return ret;
+}