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Message-ID: <ZGIGkZDW84tHr04f@nimitz>
Date: Mon, 15 May 2023 12:16:49 +0200
From: Piotr Raczynski <piotr.raczynski@...el.com>
To: Horatiu Vultur <horatiu.vultur@...rochip.com>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<pabeni@...hat.com>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net-next 2/7] net: lan966x: Add support for offloading
pcp table
On Sun, May 14, 2023 at 10:10:24PM +0200, Horatiu Vultur wrote:
> Add support for offloading pcp app entries. Lan966x has 8 priority
> queues per port and for each priority it also has a drop precedence.
>
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> ---
> .../net/ethernet/microchip/lan966x/Kconfig | 11 ++
> .../net/ethernet/microchip/lan966x/Makefile | 1 +
> .../ethernet/microchip/lan966x/lan966x_dcb.c | 104 ++++++++++++++++++
> .../ethernet/microchip/lan966x/lan966x_main.c | 2 +
> .../ethernet/microchip/lan966x/lan966x_main.h | 25 +++++
> .../ethernet/microchip/lan966x/lan966x_port.c | 30 +++++
> 6 files changed, 173 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..8ec64336abd5f
> --- /dev/null
> +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_dcb.c
> @@ -0,0 +1,104 @@
> +// 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)
> + goto out;
> +
> + /* Delete current mapping, if it exists */
> + prio = dcb_getapp(dev, app);
> + if (prio) {
> + app_itr = *app;
> + app_itr .priority = prio;
Compiles OK, still looks little weird :).
> + dcb_ieee_delapp(dev, &app_itr);
> + }
> +
> + err = dcb_ieee_setapp(dev, app);
> + if (err)
> + goto out;
> +
> + lan966x_dcb_app_update(dev, true);
> +
> +out:
> + return err;
> +}
> +
> +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
>
>
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