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// SPDX-License-Identifier: GPL-2.0+
#include "lan966x_main.h"
enum lan966x_dcb_apptrust_values {
LAN966X_DCB_APPTRUST_EMPTY,
LAN966X_DCB_APPTRUST_DSCP,
LAN966X_DCB_APPTRUST_PCP,
LAN966X_DCB_APPTRUST_DSCP_PCP,
__LAN966X_DCB_APPTRUST_MAX
};
static const struct lan966x_dcb_apptrust {
u8 selectors[IEEE_8021QAZ_APP_SEL_MAX + 1];
int nselectors;
} *lan966x_port_apptrust[NUM_PHYS_PORTS];
static const char *lan966x_dcb_apptrust_names[__LAN966X_DCB_APPTRUST_MAX] = {
[LAN966X_DCB_APPTRUST_EMPTY] = "empty",
[LAN966X_DCB_APPTRUST_DSCP] = "dscp",
[LAN966X_DCB_APPTRUST_PCP] = "pcp",
[LAN966X_DCB_APPTRUST_DSCP_PCP] = "dscp pcp"
};
/* Lan966x supported apptrust policies */
static const struct lan966x_dcb_apptrust
lan966x_dcb_apptrust_policies[__LAN966X_DCB_APPTRUST_MAX] = {
/* Empty *must* be first */
[LAN966X_DCB_APPTRUST_EMPTY] = { { 0 }, 0 },
[LAN966X_DCB_APPTRUST_DSCP] = { { IEEE_8021QAZ_APP_SEL_DSCP }, 1 },
[LAN966X_DCB_APPTRUST_PCP] = { { DCB_APP_SEL_PCP }, 1 },
[LAN966X_DCB_APPTRUST_DSCP_PCP] = { { IEEE_8021QAZ_APP_SEL_DSCP,
DCB_APP_SEL_PCP }, 2 },
};
static bool lan966x_dcb_apptrust_contains(int portno, u8 selector)
{
const struct lan966x_dcb_apptrust *conf = lan966x_port_apptrust[portno];
for (int i = 0; i < conf->nselectors; i++)
if (conf->selectors[i] == selector)
return true;
return false;
}
static void lan966x_dcb_app_update(struct net_device *dev)
{
struct lan966x_port *port = netdev_priv(dev);
struct lan966x_port_qos qos = {0};
struct dcb_app app_itr;
/* Get pcp ingress mapping */
for (int i = 0; i < ARRAY_SIZE(qos.pcp.map); i++) {
app_itr.selector = DCB_APP_SEL_PCP;
app_itr.protocol = i;
qos.pcp.map[i] = dcb_getapp(dev, &app_itr);
}
/* Get dscp ingress mapping */
for (int i = 0; i < ARRAY_SIZE(qos.dscp.map); i++) {
app_itr.selector = IEEE_8021QAZ_APP_SEL_DSCP;
app_itr.protocol = i;
qos.dscp.map[i] = dcb_getapp(dev, &app_itr);
}
/* Get default prio */
qos.default_prio = dcb_ieee_getapp_default_prio_mask(dev);
if (qos.default_prio)
qos.default_prio = fls(qos.default_prio) - 1;
/* Enable use of pcp for queue classification */
if (lan966x_dcb_apptrust_contains(port->chip_port, DCB_APP_SEL_PCP))
qos.pcp.enable = true;
/* Enable use of dscp for queue classification */
if (lan966x_dcb_apptrust_contains(port->chip_port, IEEE_8021QAZ_APP_SEL_DSCP))
qos.dscp.enable = true;
lan966x_port_qos_set(port, &qos);
}
/* DSCP mapping is global for all ports, so set and delete app entries are
* replicated for each port.
*/
static int lan966x_dcb_ieee_dscp_setdel(struct net_device *dev,
struct dcb_app *app,
int (*setdel)(struct net_device *,
struct dcb_app *))
{
struct lan966x_port *port = netdev_priv(dev);
struct lan966x *lan966x = port->lan966x;
int err;
for (int i = 0; i < NUM_PHYS_PORTS; i++) {
port = lan966x->ports[i];
if (!port)
continue;
err = setdel(port->dev, app);
if (err)
return err;
}
return 0;
}
static int lan966x_dcb_app_validate(struct net_device *dev,
const struct dcb_app *app)
{
int err = 0;
switch (app->selector) {
/* Default priority checks */
case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
if (app->protocol)
err = -EINVAL;
else if (app->priority >= NUM_PRIO_QUEUES)
err = -ERANGE;
break;
/* Dscp checks */
case IEEE_8021QAZ_APP_SEL_DSCP:
if (app->protocol >= LAN966X_PORT_QOS_DSCP_COUNT)
err = -EINVAL;
else if (app->priority >= NUM_PRIO_QUEUES)
err = -ERANGE;
break;
/* Pcp checks */
case DCB_APP_SEL_PCP:
if (app->protocol >= LAN966X_PORT_QOS_PCP_DEI_COUNT)
err = -EINVAL;
else if (app->priority >= NUM_PRIO_QUEUES)
err = -ERANGE;
break;
default:
err = -EINVAL;
break;
}
if (err)
netdev_err(dev, "Invalid entry: %d:%d\n", app->protocol,
app->priority);
return err;
}
static int lan966x_dcb_ieee_delapp(struct net_device *dev, struct dcb_app *app)
{
int err;
if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
err = lan966x_dcb_ieee_dscp_setdel(dev, app, dcb_ieee_delapp);
else
err = dcb_ieee_delapp(dev, app);
if (err)
return err;
lan966x_dcb_app_update(dev);
return 0;
}
static int lan966x_dcb_ieee_setapp(struct net_device *dev, struct dcb_app *app)
{
struct dcb_app app_itr;
int err;
u8 prio;
err = lan966x_dcb_app_validate(dev, app);
if (err)
return err;
/* Delete current mapping, if it exists */
prio = dcb_getapp(dev, app);
if (prio) {
app_itr = *app;
app_itr.priority = prio;
lan966x_dcb_ieee_delapp(dev, &app_itr);
}
if (app->selector == IEEE_8021QAZ_APP_SEL_DSCP)
err = lan966x_dcb_ieee_dscp_setdel(dev, app, dcb_ieee_setapp);
else
err = dcb_ieee_setapp(dev, app);
if (err)
return err;
lan966x_dcb_app_update(dev);
return 0;
}
static int lan966x_dcb_apptrust_validate(struct net_device *dev,
u8 *selectors,
int nselectors)
{
for (int i = 0; i < ARRAY_SIZE(lan966x_dcb_apptrust_policies); i++) {
bool match;
if (lan966x_dcb_apptrust_policies[i].nselectors != nselectors)
continue;
match = true;
for (int j = 0; j < nselectors; j++) {
if (lan966x_dcb_apptrust_policies[i].selectors[j] !=
*(selectors + j)) {
match = false;
break;
}
}
if (match)
return i;
}
netdev_err(dev, "Valid apptrust configurations are:\n");
for (int i = 0; i < ARRAY_SIZE(lan966x_dcb_apptrust_names); i++)
pr_info("order: %s\n", lan966x_dcb_apptrust_names[i]);
return -EOPNOTSUPP;
}
static int lan966x_dcb_setapptrust(struct net_device *dev,
u8 *selectors,
int nselectors)
{
struct lan966x_port *port = netdev_priv(dev);
int idx;
idx = lan966x_dcb_apptrust_validate(dev, selectors, nselectors);
if (idx < 0)
return idx;
lan966x_port_apptrust[port->chip_port] = &lan966x_dcb_apptrust_policies[idx];
lan966x_dcb_app_update(dev);
return 0;
}
static int lan966x_dcb_getapptrust(struct net_device *dev, u8 *selectors,
int *nselectors)
{
struct lan966x_port *port = netdev_priv(dev);
const struct lan966x_dcb_apptrust *trust;
trust = lan966x_port_apptrust[port->chip_port];
memcpy(selectors, trust->selectors, trust->nselectors);
*nselectors = trust->nselectors;
return 0;
}
static const struct dcbnl_rtnl_ops lan966x_dcbnl_ops = {
.ieee_setapp = lan966x_dcb_ieee_setapp,
.ieee_delapp = lan966x_dcb_ieee_delapp,
.dcbnl_setapptrust = lan966x_dcb_setapptrust,
.dcbnl_getapptrust = lan966x_dcb_getapptrust,
};
void lan966x_dcb_init(struct lan966x *lan966x)
{
for (int p = 0; p < lan966x->num_phys_ports; ++p) {
struct lan966x_port *port;
port = lan966x->ports[p];
if (!port)
continue;
port->dev->dcbnl_ops = &lan966x_dcbnl_ops;
lan966x_port_apptrust[port->chip_port] =
&lan966x_dcb_apptrust_policies[LAN966X_DCB_APPTRUST_DSCP_PCP];
}
}
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