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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019, Intel Corporation. */
#include "ice_dcb_lib.h"
/**
* ice_dcb_get_ena_tc - return bitmap of enabled TCs
* @dcbcfg: DCB config to evaluate for enabled TCs
*/
u8 ice_dcb_get_ena_tc(struct ice_dcbx_cfg *dcbcfg)
{
u8 i, num_tc, ena_tc = 1;
num_tc = ice_dcb_get_num_tc(dcbcfg);
for (i = 0; i < num_tc; i++)
ena_tc |= BIT(i);
return ena_tc;
}
/**
* ice_dcb_get_num_tc - Get the number of TCs from DCBX config
* @dcbcfg: config to retrieve number of TCs from
*/
u8 ice_dcb_get_num_tc(struct ice_dcbx_cfg *dcbcfg)
{
bool tc_unused = false;
u8 num_tc = 0;
u8 ret = 0;
int i;
/* Scan the ETS Config Priority Table to find traffic classes
* enabled and create a bitmask of enabled TCs
*/
for (i = 0; i < CEE_DCBX_MAX_PRIO; i++)
num_tc |= BIT(dcbcfg->etscfg.prio_table[i]);
/* Scan bitmask for contiguous TCs starting with TC0 */
for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
if (num_tc & BIT(i)) {
if (!tc_unused) {
ret++;
} else {
pr_err("Non-contiguous TCs - Disabling DCB\n");
return 1;
}
} else {
tc_unused = true;
}
}
/* There is always at least 1 TC */
if (!ret)
ret = 1;
return ret;
}
/**
* ice_pf_dcb_recfg - Reconfigure all VEBs and VSIs
* @pf: pointer to the PF struct
*
* Assumed caller has already disabled all VSIs before
* calling this function. Reconfiguring DCB based on
* local_dcbx_cfg.
*/
static void ice_pf_dcb_recfg(struct ice_pf *pf)
{
struct ice_dcbx_cfg *dcbcfg = &pf->hw.port_info->local_dcbx_cfg;
u8 tc_map = 0;
int v, ret;
/* Update each VSI */
ice_for_each_vsi(pf, v) {
if (!pf->vsi[v])
continue;
if (pf->vsi[v]->type == ICE_VSI_PF)
tc_map = ice_dcb_get_ena_tc(dcbcfg);
else
tc_map = ICE_DFLT_TRAFFIC_CLASS;
ret = ice_vsi_cfg_tc(pf->vsi[v], tc_map);
if (ret)
dev_err(&pf->pdev->dev,
"Failed to config TC for VSI index: %d\n",
pf->vsi[v]->idx);
else
ice_vsi_map_rings_to_vectors(pf->vsi[v]);
}
}
/**
* ice_pf_dcb_cfg - Apply new DCB configuration
* @pf: pointer to the PF struct
* @new_cfg: DCBX config to apply
*/
static int ice_pf_dcb_cfg(struct ice_pf *pf, struct ice_dcbx_cfg *new_cfg)
{
struct ice_dcbx_cfg *old_cfg, *curr_cfg;
struct ice_aqc_port_ets_elem buf = { 0 };
int ret = 0;
curr_cfg = &pf->hw.port_info->local_dcbx_cfg;
/* Enable DCB tagging only when more than one TC */
if (ice_dcb_get_num_tc(new_cfg) > 1) {
dev_dbg(&pf->pdev->dev, "DCB tagging enabled (num TC > 1)\n");
set_bit(ICE_FLAG_DCB_ENA, pf->flags);
} else {
dev_dbg(&pf->pdev->dev, "DCB tagging disabled (num TC = 1)\n");
clear_bit(ICE_FLAG_DCB_ENA, pf->flags);
}
if (!memcmp(new_cfg, curr_cfg, sizeof(*new_cfg))) {
dev_dbg(&pf->pdev->dev, "No change in DCB config required\n");
return ret;
}
/* Store old config in case FW config fails */
old_cfg = devm_kzalloc(&pf->pdev->dev, sizeof(*old_cfg), GFP_KERNEL);
memcpy(old_cfg, curr_cfg, sizeof(*old_cfg));
/* avoid race conditions by holding the lock while disabling and
* re-enabling the VSI
*/
rtnl_lock();
ice_pf_dis_all_vsi(pf, true);
memcpy(curr_cfg, new_cfg, sizeof(*curr_cfg));
memcpy(&curr_cfg->etsrec, &curr_cfg->etscfg, sizeof(curr_cfg->etsrec));
/* Only send new config to HW if we are in SW LLDP mode. Otherwise,
* the new config came from the HW in the first place.
*/
if (pf->hw.port_info->is_sw_lldp) {
ret = ice_set_dcb_cfg(pf->hw.port_info);
if (ret) {
dev_err(&pf->pdev->dev, "Set DCB Config failed\n");
/* Restore previous settings to local config */
memcpy(curr_cfg, old_cfg, sizeof(*curr_cfg));
goto out;
}
}
ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
if (ret) {
dev_err(&pf->pdev->dev, "Query Port ETS failed\n");
goto out;
}
ice_pf_dcb_recfg(pf);
out:
ice_pf_ena_all_vsi(pf, true);
rtnl_unlock();
devm_kfree(&pf->pdev->dev, old_cfg);
return ret;
}
/**
* ice_dcb_init_cfg - set the initial DCB config in SW
* @pf: pf to apply config to
*/
static int ice_dcb_init_cfg(struct ice_pf *pf)
{
struct ice_dcbx_cfg *newcfg;
struct ice_port_info *pi;
int ret = 0;
pi = pf->hw.port_info;
newcfg = devm_kzalloc(&pf->pdev->dev, sizeof(*newcfg), GFP_KERNEL);
if (!newcfg)
return -ENOMEM;
memcpy(newcfg, &pi->local_dcbx_cfg, sizeof(*newcfg));
memset(&pi->local_dcbx_cfg, 0, sizeof(*newcfg));
dev_info(&pf->pdev->dev, "Configuring initial DCB values\n");
if (ice_pf_dcb_cfg(pf, newcfg))
ret = -EINVAL;
devm_kfree(&pf->pdev->dev, newcfg);
return ret;
}
/**
* ice_init_pf_dcb - initialize DCB for a PF
* @pf: pf to initiialize DCB for
*/
int ice_init_pf_dcb(struct ice_pf *pf)
{
struct device *dev = &pf->pdev->dev;
struct ice_port_info *port_info;
struct ice_hw *hw = &pf->hw;
int err;
port_info = hw->port_info;
/* check if device is DCB capable */
if (!hw->func_caps.common_cap.dcb) {
dev_dbg(dev, "DCB not supported\n");
return -EOPNOTSUPP;
}
/* Best effort to put DCBx and LLDP into a good state */
port_info->dcbx_status = ice_get_dcbx_status(hw);
if (port_info->dcbx_status != ICE_DCBX_STATUS_DONE &&
port_info->dcbx_status != ICE_DCBX_STATUS_IN_PROGRESS) {
bool dcbx_status;
/* Attempt to start LLDP engine. Ignore errors
* as this will error if it is already started
*/
ice_aq_start_lldp(hw, NULL);
/* Attempt to start DCBX. Ignore errors as this
* will error if it is already started
*/
ice_aq_start_stop_dcbx(hw, true, &dcbx_status, NULL);
}
err = ice_init_dcb(hw);
if (err)
goto dcb_init_err;
/* DCBX in FW and LLDP enabled in FW */
pf->dcbx_cap = DCB_CAP_DCBX_LLD_MANAGED | DCB_CAP_DCBX_VER_IEEE;
set_bit(ICE_FLAG_DCB_CAPABLE, pf->flags);
err = ice_dcb_init_cfg(pf);
if (err)
goto dcb_init_err;
dev_info(&pf->pdev->dev, "DCBX offload supported\n");
return err;
dcb_init_err:
dev_err(dev, "DCB init failed\n");
return err;
}
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