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Date: Tue, 6 Dec 2022 14:53:35 +0200
From: Ido Schimmel <idosch@...sch.org>
To: "Hans J. Schultz" <netdev@...io-technology.com>
Cc: davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 3/3] net: dsa: mv88e6xxx: mac-auth/MAB
implementation
On Mon, Dec 05, 2022 at 07:59:08PM +0100, Hans J. Schultz wrote:
> This implementation for the Marvell mv88e6xxx chip series, is based on
> handling ATU miss violations occurring when packets ingress on a port
> that is locked with learning on. This will trigger a
> SWITCHDEV_FDB_ADD_TO_BRIDGE event, which will result in the bridge module
> adding a locked FDB entry. This bridge FDB entry will not age out as
> it has the extern_learn flag set.
>
> Userspace daemons can listen to these events and either accept or deny
> access for the host, by either replacing the locked FDB entry with a
> simple entry or leave the locked entry.
>
> If the host MAC address is already present on another port, a ATU
> member violation will occur, but to no real effect.
And the packet will be dropped in hardware, right?
> Statistics on these violations can be shown with the command and
> example output of interest:
>
> ethtool -S ethX
> NIC statistics:
> ...
> atu_member_violation: 5
> atu_miss_violation: 23
> ...
>
> Where ethX is the interface of the MAB enabled port.
>
> An anomaly has been observed, where the ATU op to read the FID reports
> FID=0 even though it is not a valid read. An -EINVAL error will be logged
> in this case. This was seen on a mv88e6097.
>
> Signed-off-by: Hans J. Schultz <netdev@...io-technology.com>
> ---
The changelog from previous versions is missing.
> drivers/net/dsa/mv88e6xxx/Makefile | 1 +
> drivers/net/dsa/mv88e6xxx/chip.c | 18 ++++--
> drivers/net/dsa/mv88e6xxx/chip.h | 15 +++++
> drivers/net/dsa/mv88e6xxx/global1_atu.c | 29 ++++++---
> drivers/net/dsa/mv88e6xxx/switchdev.c | 83 +++++++++++++++++++++++++
> drivers/net/dsa/mv88e6xxx/switchdev.h | 19 ++++++
> 6 files changed, 152 insertions(+), 13 deletions(-)
> create mode 100644 drivers/net/dsa/mv88e6xxx/switchdev.c
> create mode 100644 drivers/net/dsa/mv88e6xxx/switchdev.h
>
> diff --git a/drivers/net/dsa/mv88e6xxx/Makefile b/drivers/net/dsa/mv88e6xxx/Makefile
> index c8eca2b6f959..be903a983780 100644
> --- a/drivers/net/dsa/mv88e6xxx/Makefile
> +++ b/drivers/net/dsa/mv88e6xxx/Makefile
> @@ -15,3 +15,4 @@ mv88e6xxx-objs += port_hidden.o
> mv88e6xxx-$(CONFIG_NET_DSA_MV88E6XXX_PTP) += ptp.o
> mv88e6xxx-objs += serdes.o
> mv88e6xxx-objs += smi.o
> +mv88e6xxx-objs += switchdev.o
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index 66d7eae24ce0..732d7a2e2a07 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -1726,11 +1726,11 @@ static int mv88e6xxx_vtu_get(struct mv88e6xxx_chip *chip, u16 vid,
> return err;
> }
>
> -static int mv88e6xxx_vtu_walk(struct mv88e6xxx_chip *chip,
> - int (*cb)(struct mv88e6xxx_chip *chip,
> - const struct mv88e6xxx_vtu_entry *entry,
> - void *priv),
> - void *priv)
> +int mv88e6xxx_vtu_walk(struct mv88e6xxx_chip *chip,
> + int (*cb)(struct mv88e6xxx_chip *chip,
> + const struct mv88e6xxx_vtu_entry *entry,
> + void *priv),
> + void *priv)
> {
> struct mv88e6xxx_vtu_entry entry = {
> .vid = mv88e6xxx_max_vid(chip),
> @@ -6524,7 +6524,7 @@ static int mv88e6xxx_port_pre_bridge_flags(struct dsa_switch *ds, int port,
> const struct mv88e6xxx_ops *ops;
>
> if (flags.mask & ~(BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
> - BR_BCAST_FLOOD | BR_PORT_LOCKED))
> + BR_BCAST_FLOOD | BR_PORT_LOCKED | BR_PORT_MAB))
> return -EINVAL;
>
> ops = chip->info->ops;
> @@ -6582,6 +6582,12 @@ static int mv88e6xxx_port_bridge_flags(struct dsa_switch *ds, int port,
> goto out;
> }
>
> + if (flags.mask & BR_PORT_MAB) {
> + bool mab = !!(flags.val & BR_PORT_MAB);
> +
> + mv88e6xxx_port_set_mab(chip, port, mab);
> + }
> +
> if (flags.mask & BR_PORT_LOCKED) {
> bool locked = !!(flags.val & BR_PORT_LOCKED);
>
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
> index e693154cf803..f635a5bb47ce 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.h
> +++ b/drivers/net/dsa/mv88e6xxx/chip.h
> @@ -280,6 +280,9 @@ struct mv88e6xxx_port {
> unsigned int serdes_irq;
> char serdes_irq_name[64];
> struct devlink_region *region;
> +
> + /* MacAuth Bypass control flag */
> + bool mab;
> };
>
> enum mv88e6xxx_region_id {
> @@ -784,6 +787,12 @@ static inline bool mv88e6xxx_is_invalid_port(struct mv88e6xxx_chip *chip, int po
> return (chip->info->invalid_port_mask & BIT(port)) != 0;
> }
>
> +static inline void mv88e6xxx_port_set_mab(struct mv88e6xxx_chip *chip,
> + int port, bool mab)
> +{
> + chip->ports[port].mab = mab;
> +}
> +
> int mv88e6xxx_read(struct mv88e6xxx_chip *chip, int addr, int reg, u16 *val);
> int mv88e6xxx_write(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val);
> int mv88e6xxx_wait_mask(struct mv88e6xxx_chip *chip, int addr, int reg,
> @@ -802,6 +811,12 @@ static inline void mv88e6xxx_reg_unlock(struct mv88e6xxx_chip *chip)
> mutex_unlock(&chip->reg_lock);
> }
>
> +int mv88e6xxx_vtu_walk(struct mv88e6xxx_chip *chip,
> + int (*cb)(struct mv88e6xxx_chip *chip,
> + const struct mv88e6xxx_vtu_entry *entry,
> + void *priv),
> + void *priv);
> +
> int mv88e6xxx_fid_map(struct mv88e6xxx_chip *chip, unsigned long *bitmap);
>
> #endif /* _MV88E6XXX_CHIP_H */
> diff --git a/drivers/net/dsa/mv88e6xxx/global1_atu.c b/drivers/net/dsa/mv88e6xxx/global1_atu.c
> index 8a874b6fc8e1..bb004df517b2 100644
> --- a/drivers/net/dsa/mv88e6xxx/global1_atu.c
> +++ b/drivers/net/dsa/mv88e6xxx/global1_atu.c
> @@ -12,6 +12,7 @@
>
> #include "chip.h"
> #include "global1.h"
> +#include "switchdev.h"
>
> /* Offset 0x01: ATU FID Register */
>
> @@ -408,23 +409,25 @@ static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
>
> err = mv88e6xxx_g1_read_atu_violation(chip);
> if (err)
> - goto out;
> + goto out_unlock;
>
> err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_OP, &val);
> if (err)
> - goto out;
> + goto out_unlock;
>
> err = mv88e6xxx_g1_atu_fid_read(chip, &fid);
> if (err)
> - goto out;
> + goto out_unlock;
>
> err = mv88e6xxx_g1_atu_data_read(chip, &entry);
> if (err)
> - goto out;
> + goto out_unlock;
>
> err = mv88e6xxx_g1_atu_mac_read(chip, &entry);
> if (err)
> - goto out;
> + goto out_unlock;
> +
> + mv88e6xxx_reg_unlock(chip);
I was under the impression that we agreed that the locking change will
be split to a separate patch.
>
> spid = entry.state;
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