[PATCH net-next v2 2/7] net: lan966x: Add support for offloading pcp table

From: Horatiu Vultur
Date: Tue May 16 2023 - 16:14:43 EST

Add support for offloading pcp app entries. Lan966x has 8 priority
queues per port and for each priority it also has a drop precedence.

Reviewed-by: Daniel Machon <daniel.machon@xxxxxxxxxxxxx>
Reviewed-by: Piotr Raczynski <piotr.raczynski@xxxxxxxxx>
Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
---
.../net/ethernet/microchip/lan966x/Kconfig | 11 ++
.../net/ethernet/microchip/lan966x/Makefile | 1 +
.../ethernet/microchip/lan966x/lan966x_dcb.c | 103 ++++++++++++++++++
.../ethernet/microchip/lan966x/lan966x_main.c | 2 +
.../ethernet/microchip/lan966x/lan966x_main.h | 25 +++++
.../ethernet/microchip/lan966x/lan966x_port.c | 30 +++++
6 files changed, 172 insertions(+)
create mode 100644 drivers/net/ethernet/microchip/lan966x/lan966x_dcb.c

diff --git a/drivers/net/ethernet/microchip/lan966x/Kconfig b/drivers/net/ethernet/microchip/lan966x/Kconfig
index 571e6d4da1e9d..f9ebffc04eb85 100644
--- a/drivers/net/ethernet/microchip/lan966x/Kconfig
+++ b/drivers/net/ethernet/microchip/lan966x/Kconfig
@@ -10,3 +10,14 @@ config LAN966X_SWITCH
select VCAP
help
This driver supports the Lan966x network switch device.
+
+config LAN966X_DCB
+ bool "Data Center Bridging (DCB) support"
+ depends on LAN966X_SWITCH && DCB
+ default y
+ help
+ Say Y here if you want to use Data Center Bridging (DCB) in the
+ driver. This can be used to assign priority to traffic, based on
+ DSCP and PCP.
+
+ If unsure, set to Y.
diff --git a/drivers/net/ethernet/microchip/lan966x/Makefile b/drivers/net/ethernet/microchip/lan966x/Makefile
index 7b0cda4ffa6b5..3b6ac331691d0 100644
--- a/drivers/net/ethernet/microchip/lan966x/Makefile
+++ b/drivers/net/ethernet/microchip/lan966x/Makefile
@@ -15,6 +15,7 @@ lan966x-switch-objs := lan966x_main.o lan966x_phylink.o lan966x_port.o \
lan966x_xdp.o lan966x_vcap_impl.o lan966x_vcap_ag_api.o \
lan966x_tc_flower.o lan966x_goto.o

+lan966x-switch-$(CONFIG_LAN966X_DCB) += lan966x_dcb.o
lan966x-switch-$(CONFIG_DEBUG_FS) += lan966x_vcap_debugfs.o

# Provide include files
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_dcb.c b/drivers/net/ethernet/microchip/lan966x/lan966x_dcb.c
new file mode 100644
index 0000000000000..e0d49421812f1
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_dcb.c
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+static void lan966x_dcb_app_update(struct net_device *dev, bool enable)
+{
+ 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);
+ }
+
+ qos.pcp.enable = enable;
+ lan966x_port_qos_set(port, &qos);
+}
+
+static int lan966x_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 >= 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;
+
+ err = dcb_ieee_delapp(dev, app);
+ if (err < 0)
+ return err;
+
+ lan966x_dcb_app_update(dev, false);
+
+ 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;
+ dcb_ieee_delapp(dev, &app_itr);
+ }
+
+ err = dcb_ieee_setapp(dev, app);
+ if (err)
+ return err;
+
+ lan966x_dcb_app_update(dev, true);
+
+ return 0;
+}
+
+static const struct dcbnl_rtnl_ops lan966x_dcbnl_ops = {
+ .ieee_setapp = lan966x_dcb_ieee_setapp,
+ .ieee_delapp = lan966x_dcb_ieee_delapp,
+};
+
+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;
+ }
+}
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index ee2698698d71a..f6931dfb3e68e 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -1223,6 +1223,8 @@ static int lan966x_probe(struct platform_device *pdev)
if (err)
goto cleanup_fdma;

+ lan966x_dcb_init(lan966x);
+
return 0;

cleanup_fdma:
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 882d5a08e7d51..b9ca47ab6e8be 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -104,6 +104,11 @@
#define LAN966X_VCAP_CID_ES0_L0 VCAP_CID_EGRESS_L0 /* ES0 lookup 0 */
#define LAN966X_VCAP_CID_ES0_MAX (VCAP_CID_EGRESS_L1 - 1) /* ES0 Max */

+#define LAN966X_PORT_QOS_PCP_COUNT 8
+#define LAN966X_PORT_QOS_DEI_COUNT 8
+#define LAN966X_PORT_QOS_PCP_DEI_COUNT \
+ (LAN966X_PORT_QOS_PCP_COUNT + LAN966X_PORT_QOS_DEI_COUNT)
+
/* MAC table entry types.
* ENTRYTYPE_NORMAL is subject to aging.
* ENTRYTYPE_LOCKED is not subject to aging.
@@ -392,6 +397,15 @@ struct lan966x_port_tc {
struct flow_stats mirror_stat;
};

+struct lan966x_port_qos_pcp {
+ u8 map[LAN966X_PORT_QOS_PCP_DEI_COUNT];
+ bool enable;
+};
+
+struct lan966x_port_qos {
+ struct lan966x_port_qos_pcp pcp;
+};
+
struct lan966x_port {
struct net_device *dev;
struct lan966x *lan966x;
@@ -456,6 +470,9 @@ int lan966x_port_pcs_set(struct lan966x_port *port,
struct lan966x_port_config *config);
void lan966x_port_init(struct lan966x_port *port);

+void lan966x_port_qos_set(struct lan966x_port *port,
+ struct lan966x_port_qos *qos);
+
int lan966x_mac_ip_learn(struct lan966x *lan966x,
bool cpu_copy,
const unsigned char mac[ETH_ALEN],
@@ -680,6 +697,14 @@ int lan966x_goto_port_del(struct lan966x_port *port,
unsigned long goto_id,
struct netlink_ext_ack *extack);

+#ifdef CONFIG_LAN966X_DCB
+void lan966x_dcb_init(struct lan966x *lan966x);
+#else
+static inline void lan966x_dcb_init(struct lan966x *lan966x)
+{
+}
+#endif
+
static inline void __iomem *lan_addr(void __iomem *base[],
int id, int tinst, int tcnt,
int gbase, int ginst,
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_port.c b/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
index 0050fcb988b75..0cee8127c48eb 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
@@ -394,6 +394,36 @@ int lan966x_port_pcs_set(struct lan966x_port *port,
return 0;
}

+static void lan966x_port_qos_pcp_set(struct lan966x_port *port,
+ struct lan966x_port_qos_pcp *qos)
+{
+ u8 *pcp_itr = qos->map;
+ u8 pcp, dp;
+
+ lan_rmw(ANA_QOS_CFG_QOS_PCP_ENA_SET(qos->enable),
+ ANA_QOS_CFG_QOS_PCP_ENA,
+ port->lan966x, ANA_QOS_CFG(port->chip_port));
+
+ /* Map PCP and DEI to priority */
+ for (int i = 0; i < ARRAY_SIZE(qos->map); i++) {
+ pcp = *(pcp_itr + i);
+ dp = (i < LAN966X_PORT_QOS_PCP_COUNT) ? 0 : 1;
+
+ lan_rmw(ANA_PCP_DEI_CFG_QOS_PCP_DEI_VAL_SET(pcp) |
+ ANA_PCP_DEI_CFG_DP_PCP_DEI_VAL_SET(dp),
+ ANA_PCP_DEI_CFG_QOS_PCP_DEI_VAL |
+ ANA_PCP_DEI_CFG_DP_PCP_DEI_VAL,
+ port->lan966x,
+ ANA_PCP_DEI_CFG(port->chip_port, i));
+ }
+}
+
+void lan966x_port_qos_set(struct lan966x_port *port,
+ struct lan966x_port_qos *qos)
+{
+ lan966x_port_qos_pcp_set(port, &qos->pcp);
+}
+
void lan966x_port_init(struct lan966x_port *port)
{
struct lan966x_port_config *config = &port->config;
--
2.38.0