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// SPDX-License-Identifier: GPL-2.0+
/* Microchip Sparx5 Switch driver
*
* Copyright (c) 2022 Microchip Technology Inc. and its subsidiaries.
*/
#include <net/dcbnl.h>
#include "sparx5_port.h"
enum sparx5_dcb_apptrust_values {
SPARX5_DCB_APPTRUST_EMPTY,
SPARX5_DCB_APPTRUST_DSCP,
SPARX5_DCB_APPTRUST_PCP,
SPARX5_DCB_APPTRUST_DSCP_PCP,
__SPARX5_DCB_APPTRUST_MAX
};
static const struct sparx5_dcb_apptrust {
u8 selectors[IEEE_8021QAZ_APP_SEL_MAX + 1];
int nselectors;
} *sparx5_port_apptrust[SPX5_PORTS];
static const char *sparx5_dcb_apptrust_names[__SPARX5_DCB_APPTRUST_MAX] = {
[SPARX5_DCB_APPTRUST_EMPTY] = "empty",
[SPARX5_DCB_APPTRUST_DSCP] = "dscp",
[SPARX5_DCB_APPTRUST_PCP] = "pcp",
[SPARX5_DCB_APPTRUST_DSCP_PCP] = "dscp pcp"
};
/* Sparx5 supported apptrust policies */
static const struct sparx5_dcb_apptrust
sparx5_dcb_apptrust_policies[__SPARX5_DCB_APPTRUST_MAX] = {
/* Empty *must* be first */
[SPARX5_DCB_APPTRUST_EMPTY] = { { 0 }, 0 },
[SPARX5_DCB_APPTRUST_DSCP] = { { IEEE_8021QAZ_APP_SEL_DSCP }, 1 },
[SPARX5_DCB_APPTRUST_PCP] = { { DCB_APP_SEL_PCP }, 1 },
[SPARX5_DCB_APPTRUST_DSCP_PCP] = { { IEEE_8021QAZ_APP_SEL_DSCP,
DCB_APP_SEL_PCP }, 2 },
};
/* Validate app entry.
*
* Check for valid selectors and valid protocol and priority ranges.
*/
static int sparx5_dcb_app_validate(struct net_device *dev,
const struct dcb_app *app)
{
int err = 0;
switch (app->selector) {
/* Pcp checks */
case DCB_APP_SEL_PCP:
if (app->protocol >= SPARX5_PORT_QOS_PCP_DEI_COUNT)
err = -EINVAL;
else if (app->priority >= SPX5_PRIOS)
err = -ERANGE;
break;
default:
err = -EINVAL;
break;
}
if (err)
netdev_err(dev, "Invalid entry: %d:%d\n", app->protocol,
app->priority);
return err;
}
/* Validate apptrust configuration.
*
* Return index of supported apptrust configuration if valid, otherwise return
* error.
*/
static int sparx5_dcb_apptrust_validate(struct net_device *dev, u8 *selectors,
int nselectors, int *err)
{
bool match;
int i, ii;
for (i = 0; i < ARRAY_SIZE(sparx5_dcb_apptrust_policies); i++) {
if (sparx5_dcb_apptrust_policies[i].nselectors != nselectors)
continue;
match = true;
for (ii = 0; ii < nselectors; ii++) {
if (sparx5_dcb_apptrust_policies[i].selectors[ii] !=
*(selectors + ii)) {
match = false;
break;
}
}
if (match)
break;
}
/* Requested trust configuration is not supported */
if (!match) {
netdev_err(dev, "Valid apptrust configurations are:\n");
for (i = 0; i < ARRAY_SIZE(sparx5_dcb_apptrust_names); i++)
pr_info("order: %s\n", sparx5_dcb_apptrust_names[i]);
*err = -EOPNOTSUPP;
}
return i;
}
static bool sparx5_dcb_apptrust_contains(int portno, u8 selector)
{
const struct sparx5_dcb_apptrust *conf = sparx5_port_apptrust[portno];
int i;
for (i = 0; i < conf->nselectors; i++)
if (conf->selectors[i] == selector)
return true;
return false;
}
static int sparx5_dcb_app_update(struct net_device *dev)
{
struct dcb_app app_itr = { .selector = DCB_APP_SEL_PCP };
struct sparx5_port *port = netdev_priv(dev);
struct sparx5_port_qos_pcp_map *pcp_map;
struct sparx5_port_qos qos = {0};
int portno = port->portno;
int i;
pcp_map = &qos.pcp.map;
/* Get pcp ingress mapping */
for (i = 0; i < ARRAY_SIZE(pcp_map->map); i++) {
app_itr.protocol = i;
pcp_map->map[i] = dcb_getapp(dev, &app_itr);
}
/* Enable use of pcp for queue classification ? */
if (sparx5_dcb_apptrust_contains(portno, DCB_APP_SEL_PCP)) {
qos.pcp.qos_enable = true;
qos.pcp.dp_enable = qos.pcp.qos_enable;
}
return sparx5_port_qos_set(port, &qos);
}
static int sparx5_dcb_ieee_setapp(struct net_device *dev, struct dcb_app *app)
{
struct dcb_app app_itr;
int err = 0;
u8 prio;
err = sparx5_dcb_app_validate(dev, app);
if (err)
goto out;
/* Delete current mapping, if it exists */
prio = dcb_getapp(dev, app);
if (prio) {
app_itr = *app;
app_itr.priority = prio;
dcb_ieee_delapp(dev, &app_itr);
}
err = dcb_ieee_setapp(dev, app);
if (err)
goto out;
sparx5_dcb_app_update(dev);
out:
return err;
}
static int sparx5_dcb_ieee_delapp(struct net_device *dev, struct dcb_app *app)
{
int err;
err = dcb_ieee_delapp(dev, app);
if (err < 0)
return err;
return sparx5_dcb_app_update(dev);
}
static int sparx5_dcb_setapptrust(struct net_device *dev, u8 *selectors,
int nselectors)
{
struct sparx5_port *port = netdev_priv(dev);
int err = 0, idx;
idx = sparx5_dcb_apptrust_validate(dev, selectors, nselectors, &err);
if (err < 0)
return err;
sparx5_port_apptrust[port->portno] = &sparx5_dcb_apptrust_policies[idx];
return sparx5_dcb_app_update(dev);
}
static int sparx5_dcb_getapptrust(struct net_device *dev, u8 *selectors,
int *nselectors)
{
struct sparx5_port *port = netdev_priv(dev);
const struct sparx5_dcb_apptrust *trust;
trust = sparx5_port_apptrust[port->portno];
memcpy(selectors, trust->selectors, trust->nselectors);
*nselectors = trust->nselectors;
return 0;
}
const struct dcbnl_rtnl_ops sparx5_dcbnl_ops = {
.ieee_setapp = sparx5_dcb_ieee_setapp,
.ieee_delapp = sparx5_dcb_ieee_delapp,
.dcbnl_setapptrust = sparx5_dcb_setapptrust,
.dcbnl_getapptrust = sparx5_dcb_getapptrust,
};
int sparx5_dcb_init(struct sparx5 *sparx5)
{
struct sparx5_port *port;
int i;
for (i = 0; i < SPX5_PORTS; i++) {
port = sparx5->ports[i];
if (!port)
continue;
port->ndev->dcbnl_ops = &sparx5_dcbnl_ops;
/* Initialize [dscp, pcp] default trust */
sparx5_port_apptrust[port->portno] =
&sparx5_dcb_apptrust_policies
[SPARX5_DCB_APPTRUST_DSCP_PCP];
}
return 0;
}
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