Re: [PATCH net-next v4 6/8] net: mscc: ocelot: Add support for MRP

From: Vladimir Oltean
Date: Wed Feb 17 2021 - 06:15:21 EST

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In reply to: Horatiu Vultur: "[PATCH net-next v4 6/8] net: mscc: ocelot: Add support for MRP"
Next in thread: Horatiu Vultur: "Re: [PATCH net-next v4 6/8] net: mscc: ocelot: Add support for MRP"
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On Tue, Feb 16, 2021 at 10:42:03PM +0100, Horatiu Vultur wrote:
> Add basic support for MRP. The HW will just trap all MRP frames on the
> ring ports to CPU and allow the SW to process them. In this way it is
> possible to for this node to behave both as MRM and MRC.
>
> Current limitations are:
> - it doesn't support Interconnect roles.
> - it supports only a single ring.
> - the HW should be able to do forwarding of MRP Test frames so the SW
> will not need to do this. So it would be able to have the role MRC
> without SW support.
>
> Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
> ---
> drivers/net/ethernet/mscc/Makefile | 1 +
> drivers/net/ethernet/mscc/ocelot.c | 10 +-
> drivers/net/ethernet/mscc/ocelot_mrp.c | 175 +++++++++++++++++++++++++
> drivers/net/ethernet/mscc/ocelot_net.c | 60 +++++++++
> include/linux/dsa/ocelot.h | 5 +
> include/soc/mscc/ocelot.h | 45 +++++++
> 6 files changed, 295 insertions(+), 1 deletion(-)
> create mode 100644 drivers/net/ethernet/mscc/ocelot_mrp.c
>
> diff --git a/drivers/net/ethernet/mscc/Makefile b/drivers/net/ethernet/mscc/Makefile
> index 346bba2730ad..722c27694b21 100644
> --- a/drivers/net/ethernet/mscc/Makefile
> +++ b/drivers/net/ethernet/mscc/Makefile
> @@ -8,6 +8,7 @@ mscc_ocelot_switch_lib-y := \
> ocelot_flower.o \
> ocelot_ptp.o \
> ocelot_devlink.o
> +mscc_ocelot_switch_lib-$(CONFIG_BRIDGE_MRP) += ocelot_mrp.o
> obj-$(CONFIG_MSCC_OCELOT_SWITCH) += mscc_ocelot.o
> mscc_ocelot-y := \
> ocelot_vsc7514.o \
> diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
> index 5d13087c85d6..46e5c9136bac 100644
> --- a/drivers/net/ethernet/mscc/ocelot.c
> +++ b/drivers/net/ethernet/mscc/ocelot.c
> @@ -687,7 +687,7 @@ static int ocelot_xtr_poll_xfh(struct ocelot *ocelot, int grp, u32 *xfh)
> int ocelot_xtr_poll_frame(struct ocelot *ocelot, int grp, struct sk_buff **nskb)
> {
> struct skb_shared_hwtstamps *shhwtstamps;
> - u64 tod_in_ns, full_ts_in_ns;
> + u64 tod_in_ns, full_ts_in_ns, cpuq;
> u64 timestamp, src_port, len;
> u32 xfh[OCELOT_TAG_LEN / 4];
> struct net_device *dev;
> @@ -704,6 +704,7 @@ int ocelot_xtr_poll_frame(struct ocelot *ocelot, int grp, struct sk_buff **nskb)
> ocelot_xfh_get_src_port(xfh, &src_port);
> ocelot_xfh_get_len(xfh, &len);
> ocelot_xfh_get_rew_val(xfh, &timestamp);
> + ocelot_xfh_get_cpuq(xfh, &cpuq);
>
> if (WARN_ON(src_port >= ocelot->num_phys_ports))
> return -EINVAL;
> @@ -770,6 +771,13 @@ int ocelot_xtr_poll_frame(struct ocelot *ocelot, int grp, struct sk_buff **nskb)
> skb->offload_fwd_mark = 1;
>
> skb->protocol = eth_type_trans(skb, dev);
> +
> +#if IS_ENABLED(CONFIG_BRIDGE_MRP)
> + if (skb->protocol == cpu_to_be16(ETH_P_MRP) &&
> + cpuq & BIT(OCELOT_MRP_CPUQ))
> + skb->offload_fwd_mark = 0;
> +#endif

Same comment as in DSA, it sounds simpler to me to just do:

if ((ocelot->bridge_mask & BIT(src_port)) &&
!(cpuq & BIT(OCELOT_MRP_CPUQ)))
skb->offload_fwd_mark = 1;

When we add support for more packet traps, this check will be more
amortized anyway.

> +
> *nskb = skb;
>
> return 0;
> diff --git a/drivers/net/ethernet/mscc/ocelot_mrp.c b/drivers/net/ethernet/mscc/ocelot_mrp.c
> new file mode 100644
> index 000000000000..683da320bfd8
> --- /dev/null
> +++ b/drivers/net/ethernet/mscc/ocelot_mrp.c
> @@ -0,0 +1,175 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/* Microsemi Ocelot Switch driver
> + *
> + * This contains glue logic between the switchdev driver operations and the
> + * mscc_ocelot_switch_lib.

Wrong, this _is_ part of the mscc_ocelot_switch_lib. Which is also the
reason why some of the code below will not work.

> + *
> + * Copyright (c) 2017, 2019 Microsemi Corporation
> + * Copyright 2020-2021 NXP Semiconductors
> + */
> +
> +#include <linux/if_bridge.h>
> +#include <linux/mrp_bridge.h>
> +#include <soc/mscc/ocelot_vcap.h>
> +#include <uapi/linux/mrp_bridge.h>
> +#include "ocelot.h"
> +#include "ocelot_vcap.h"
> +
> +static int ocelot_mrp_del_vcap(struct ocelot *ocelot, int port)
> +{
> + struct ocelot_vcap_block *block_vcap_is2;
> + struct ocelot_vcap_filter *filter;
> +
> + block_vcap_is2 = &ocelot->block[VCAP_IS2];
> + filter = ocelot_vcap_block_find_filter_by_id(block_vcap_is2, port,
> + false);
> + if (!filter)
> + return 0;
> +
> + return ocelot_vcap_filter_del(ocelot, filter);
> +}
> +
> +int ocelot_mrp_add(struct ocelot *ocelot, int port,
> + const struct switchdev_obj_mrp *mrp)
> +{
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> + struct ocelot_port_private *priv;
> + struct net_device *dev;
> +
> + if (!ocelot_port)
> + return -EOPNOTSUPP;
> +
> + priv = container_of(ocelot_port, struct ocelot_port_private, port);
> + dev = priv->dev;

No, no, no.
The struct net_device registered by DSA uses a netdev_priv of
struct dsa_slave_priv. You can't just go ahead and assume that the
caller of this function uses struct ocelot_port_private.

Please go to struct ocelot_port and add:
bool is_mrp_primary;
bool is_mrp_secondary;

and replace the checks for a net_device with bools.

> +
> + if (mrp->p_port != dev && mrp->s_port != dev)
> + return 0;
> +
> + if (ocelot->mrp_ring_id != 0 &&
> + ocelot->mrp_s_port &&
> + ocelot->mrp_p_port)
> + return -EINVAL;
> +
> + if (mrp->p_port == dev)
> + ocelot->mrp_p_port = dev;
> +
> + if (mrp->s_port == dev)
> + ocelot->mrp_s_port = dev;
> +
> + ocelot->mrp_ring_id = mrp->ring_id;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(ocelot_mrp_add);
> +
> +int ocelot_mrp_del(struct ocelot *ocelot, int port,
> + const struct switchdev_obj_mrp *mrp)
> +{
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> + struct ocelot_port_private *priv;
> + struct net_device *dev;
> +
> + if (!ocelot_port)
> + return -EOPNOTSUPP;
> +
> + priv = container_of(ocelot_port, struct ocelot_port_private, port);
> + dev = priv->dev;
> +
> + if (ocelot->mrp_p_port != dev && ocelot->mrp_s_port != dev)
> + return 0;
> +
> + if (ocelot->mrp_ring_id == 0 &&
> + !ocelot->mrp_s_port &&
> + !ocelot->mrp_p_port)
> + return -EINVAL;
> +
> + if (ocelot_mrp_del_vcap(ocelot, priv->chip_port))
> + return -EINVAL;
> +
> + if (ocelot->mrp_p_port == dev)
> + ocelot->mrp_p_port = NULL;
> +
> + if (ocelot->mrp_s_port == dev)
> + ocelot->mrp_s_port = NULL;
> +
> + ocelot->mrp_ring_id = 0;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(ocelot_mrp_del);
> +
> +int ocelot_mrp_add_ring_role(struct ocelot *ocelot, int port,
> + const struct switchdev_obj_ring_role_mrp *mrp)
> +{
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> + struct ocelot_vcap_filter *filter;
> + struct ocelot_port_private *priv;
> + struct net_device *dev;
> + int err;
> +
> + if (!ocelot_port)
> + return -EOPNOTSUPP;
> +
> + priv = container_of(ocelot_port, struct ocelot_port_private, port);
> + dev = priv->dev;
> +
> + if (ocelot->mrp_ring_id != mrp->ring_id)
> + return -EINVAL;
> +
> + if (!mrp->sw_backup)
> + return -EOPNOTSUPP;
> +
> + if (ocelot->mrp_p_port != dev && ocelot->mrp_s_port != dev)
> + return 0;
> +
> + filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
> + if (!filter)
> + return -ENOMEM;
> +
> + filter->key_type = OCELOT_VCAP_KEY_ETYPE;
> + filter->prio = 1;
> + filter->id.cookie = priv->chip_port;

You have "port" already. This is also wrong for the reason I stated above:
no "priv" in the common library.

> + filter->id.tc_offload = false;
> + filter->block_id = VCAP_IS2;
> + filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
> + filter->ingress_port_mask = BIT(priv->chip_port);
> + *(__be16 *)filter->key.etype.etype.value = htons(ETH_P_MRP);
> + *(__be16 *)filter->key.etype.etype.mask = htons(0xffff);
> + filter->action.mask_mode = OCELOT_MASK_MODE_PERMIT_DENY;
> + filter->action.port_mask = 0x0;
> + filter->action.cpu_copy_ena = true;
> + filter->action.cpu_qu_num = OCELOT_MRP_CPUQ;
> +
> + err = ocelot_vcap_filter_add(ocelot, filter, NULL);
> + if (err)
> + kfree(filter);
> +
> + return err;
> +}
> +EXPORT_SYMBOL(ocelot_mrp_add_ring_role);
> +
> +int ocelot_mrp_del_ring_role(struct ocelot *ocelot, int port,
> + const struct switchdev_obj_ring_role_mrp *mrp)
> +{
> + struct ocelot_port *ocelot_port = ocelot->ports[port];
> + struct ocelot_port_private *priv;
> + struct net_device *dev;
> +
> + if (!ocelot_port)
> + return -EOPNOTSUPP;
> +
> + priv = container_of(ocelot_port, struct ocelot_port_private, port);
> + dev = priv->dev;
> +
> + if (ocelot->mrp_ring_id != mrp->ring_id)
> + return -EINVAL;
> +
> + if (!mrp->sw_backup)
> + return -EOPNOTSUPP;
> +
> + if (ocelot->mrp_p_port != dev && ocelot->mrp_s_port != dev)
> + return 0;
> +
> + return ocelot_mrp_del_vcap(ocelot, priv->chip_port);
> +}
> +EXPORT_SYMBOL(ocelot_mrp_del_ring_role);
> diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
> index 6518262532f0..12cb6867a2d0 100644
> --- a/drivers/net/ethernet/mscc/ocelot_net.c
> +++ b/drivers/net/ethernet/mscc/ocelot_net.c
> @@ -1010,6 +1010,52 @@ static int ocelot_port_obj_del_mdb(struct net_device *dev,
> return ocelot_port_mdb_del(ocelot, port, mdb);
> }
>
> +static int ocelot_port_obj_mrp_add(struct net_device *dev,
> + const struct switchdev_obj_mrp *mrp)
> +{
> + struct ocelot_port_private *priv = netdev_priv(dev);
> + struct ocelot_port *ocelot_port = &priv->port;
> + struct ocelot *ocelot = ocelot_port->ocelot;
> + int port = priv->chip_port;
> +
> + return ocelot_mrp_add(ocelot, port, mrp);
> +}
> +
> +static int ocelot_port_obj_mrp_del(struct net_device *dev,
> + const struct switchdev_obj_mrp *mrp)
> +{
> + struct ocelot_port_private *priv = netdev_priv(dev);
> + struct ocelot_port *ocelot_port = &priv->port;
> + struct ocelot *ocelot = ocelot_port->ocelot;
> + int port = priv->chip_port;
> +
> + return ocelot_mrp_del(ocelot, port, mrp);
> +}
> +
> +static int
> +ocelot_port_obj_mrp_add_ring_role(struct net_device *dev,
> + const struct switchdev_obj_ring_role_mrp *mrp)
> +{
> + struct ocelot_port_private *priv = netdev_priv(dev);
> + struct ocelot_port *ocelot_port = &priv->port;
> + struct ocelot *ocelot = ocelot_port->ocelot;
> + int port = priv->chip_port;
> +
> + return ocelot_mrp_add_ring_role(ocelot, port, mrp);
> +}
> +
> +static int
> +ocelot_port_obj_mrp_del_ring_role(struct net_device *dev,
> + const struct switchdev_obj_ring_role_mrp *mrp)
> +{
> + struct ocelot_port_private *priv = netdev_priv(dev);
> + struct ocelot_port *ocelot_port = &priv->port;
> + struct ocelot *ocelot = ocelot_port->ocelot;
> + int port = priv->chip_port;
> +
> + return ocelot_mrp_del_ring_role(ocelot, port, mrp);
> +}
> +
> static int ocelot_port_obj_add(struct net_device *dev,
> const struct switchdev_obj *obj,
> struct netlink_ext_ack *extack)
> @@ -1024,6 +1070,13 @@ static int ocelot_port_obj_add(struct net_device *dev,
> case SWITCHDEV_OBJ_ID_PORT_MDB:
> ret = ocelot_port_obj_add_mdb(dev, SWITCHDEV_OBJ_PORT_MDB(obj));
> break;
> + case SWITCHDEV_OBJ_ID_MRP:
> + ret = ocelot_port_obj_mrp_add(dev, SWITCHDEV_OBJ_MRP(obj));
> + break;
> + case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
> + ret = ocelot_port_obj_mrp_add_ring_role(dev,
> + SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
> + break;
> default:
> return -EOPNOTSUPP;
> }
> @@ -1044,6 +1097,13 @@ static int ocelot_port_obj_del(struct net_device *dev,
> case SWITCHDEV_OBJ_ID_PORT_MDB:
> ret = ocelot_port_obj_del_mdb(dev, SWITCHDEV_OBJ_PORT_MDB(obj));
> break;
> + case SWITCHDEV_OBJ_ID_MRP:
> + ret = ocelot_port_obj_mrp_del(dev, SWITCHDEV_OBJ_MRP(obj));
> + break;
> + case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
> + ret = ocelot_port_obj_mrp_del_ring_role(dev,
> + SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
> + break;
> default:
> return -EOPNOTSUPP;
> }
> diff --git a/include/linux/dsa/ocelot.h b/include/linux/dsa/ocelot.h
> index c6bc45ae5e03..4265f328681a 100644
> --- a/include/linux/dsa/ocelot.h
> +++ b/include/linux/dsa/ocelot.h
> @@ -160,6 +160,11 @@ static inline void ocelot_xfh_get_src_port(void *extraction, u64 *src_port)
> packing(extraction, src_port, 46, 43, OCELOT_TAG_LEN, UNPACK, 0);
> }
>
> +static inline void ocelot_xfh_get_cpuq(void *extraction, u64 *cpuq)
> +{
> + packing(extraction, cpuq, 28, 20, OCELOT_TAG_LEN, UNPACK, 0);
> +}
> +
> static inline void ocelot_xfh_get_qos_class(void *extraction, u64 *qos_class)
> {
> packing(extraction, qos_class, 19, 17, OCELOT_TAG_LEN, UNPACK, 0);
> diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
> index 1f2d90976564..425ff29d9389 100644
> --- a/include/soc/mscc/ocelot.h
> +++ b/include/soc/mscc/ocelot.h
> @@ -112,6 +112,8 @@
> #define REG_RESERVED_ADDR 0xffffffff
> #define REG_RESERVED(reg) REG(reg, REG_RESERVED_ADDR)
>
> +#define OCELOT_MRP_CPUQ 7
> +
> enum ocelot_target {
> ANA = 1,
> QS,
> @@ -677,6 +679,12 @@ struct ocelot {
> /* Protects the PTP clock */
> spinlock_t ptp_clock_lock;
> struct ptp_pin_desc ptp_pins[OCELOT_PTP_PINS_NUM];
> +
> +#if IS_ENABLED(CONFIG_BRIDGE_MRP)
> + u16 mrp_ring_id;
> + struct net_device *mrp_p_port;
> + struct net_device *mrp_s_port;
> +#endif

I'd rather have this without the ifdeffery, doesn't seem too expensive
to justify compiling it out. We have a 4K array of VLANs in struct
ocelot, for god's sake.

Next message: Lukasz Luba: "[PATCH] MAINTAINERS: update thermal CPU cooling section"
Previous message: Stefano Garzarella: "Re: [PATCH for 5.10 v2 0/5] vdpa_sim: fix param validation in vdpasim_get_config()"
In reply to: Horatiu Vultur: "[PATCH net-next v4 6/8] net: mscc: ocelot: Add support for MRP"
Next in thread: Horatiu Vultur: "Re: [PATCH net-next v4 6/8] net: mscc: ocelot: Add support for MRP"
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