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Date: Tue, 8 Sep 2020 12:01:06 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Andrew Lunn <andrew@...n.ch>, David Miller <davem@...emloft.net>,
netdev <netdev@...r.kernel.org>, Chris Healy <cphealy@...il.com>,
Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH net-next v2 5/7] net: dsa: mv88e6xxx: Add devlink
regions
On Tue, 8 Sep 2020 02:51:53 +0200 Andrew Lunn wrote:
> Allow ports, the global registers, and the ATU to be snapshot via
> devlink regions.
>
> v2:
> Remove left over debug prints
> Comment ATU format is generic for mv88e6xxx, not wider
>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
Probably best CCing devlink maintainers on devlink patches.
Also - it's always useful to include show command outputs in the commit
message for devlink patches.
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index d8bb5e5e8583..8d1710c896ae 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -2838,6 +2838,7 @@ static void mv88e6xxx_teardown(struct dsa_switch *ds)
> {
> mv88e6xxx_teardown_devlink_params(ds);
> dsa_devlink_resources_unregister(ds);
> + mv88e6xxx_teardown_devlink_regions(ds);
> }
>
> static int mv88e6xxx_setup(struct dsa_switch *ds)
> @@ -2970,7 +2971,18 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
>
> err = mv88e6xxx_setup_devlink_params(ds);
> if (err)
> - dsa_devlink_resources_unregister(ds);
> + goto out_resources;
> +
> + err = mv88e6xxx_setup_devlink_regions(ds);
> + if (err)
> + goto out_params;
> +
> + return 0;
> +
> +out_params:
> + mv88e6xxx_teardown_devlink_params(ds);
> +out_resources:
> + dsa_devlink_resources_unregister(ds);
>
> return err;
> }
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
> index 77d81aa99f37..d8bd211afcec 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.h
> +++ b/drivers/net/dsa/mv88e6xxx/chip.h
> @@ -238,6 +238,15 @@ struct mv88e6xxx_port {
> bool mirror_egress;
> unsigned int serdes_irq;
> char serdes_irq_name[64];
> + struct devlink_region *region;
> +};
> +
> +enum mv88e6xxx_region_id {
> + MV88E6XXX_REGION_GLOBAL1 = 0,
> + MV88E6XXX_REGION_GLOBAL2,
> + MV88E6XXX_REGION_ATU,
> +
> + _MV88E6XXX_REGION_MAX,
> };
>
> struct mv88e6xxx_chip {
> @@ -334,6 +343,9 @@ struct mv88e6xxx_chip {
>
> /* Array of port structures. */
> struct mv88e6xxx_port ports[DSA_MAX_PORTS];
> +
> + /* devlink regions */
> + struct devlink_region *regions[_MV88E6XXX_REGION_MAX];
> };
>
> struct mv88e6xxx_bus_ops {
> diff --git a/drivers/net/dsa/mv88e6xxx/devlink.c b/drivers/net/dsa/mv88e6xxx/devlink.c
> index 91e02024c5cf..d93a2b33e355 100644
> --- a/drivers/net/dsa/mv88e6xxx/devlink.c
> +++ b/drivers/net/dsa/mv88e6xxx/devlink.c
> @@ -5,6 +5,7 @@
> #include "devlink.h"
> #include "global1.h"
> #include "global2.h"
> +#include "port.h"
>
> static int mv88e6xxx_atu_get_hash(struct mv88e6xxx_chip *chip, u8 *hash)
> {
> @@ -260,3 +261,411 @@ int mv88e6xxx_setup_devlink_resources(struct dsa_switch *ds)
> return err;
> }
>
> +static int mv88e6xxx_region_port_snapshot(struct devlink *dl,
> + struct netlink_ext_ack *extack,
> + u8 **data,
> + int port)
> +{
> + struct dsa_switch *ds = dsa_devlink_to_ds(dl);
> + struct mv88e6xxx_chip *chip = ds->priv;
> + u16 *registers;
> + int i, err;
> +
> + registers = kmalloc_array(32, sizeof(u16), GFP_KERNEL);
> + if (!registers)
> + return -ENOMEM;
> +
> + mv88e6xxx_reg_lock(chip);
> + for (i = 0; i < 32; i++) {
> + err = mv88e6xxx_port_read(chip, port, i, ®isters[i]);
> + if (err) {
> + kfree(registers);
> + goto out;
> + }
> + }
> + *data = (u8 *)registers;
> +out:
> + mv88e6xxx_reg_unlock(chip);
> +
> + return err;
> +}
> +
> +#define PORT_SNAPSHOT(_X_) \
> +static int mv88e6xxx_region_port_ ## _X_ ## _snapshot( \
> + struct devlink *dl, \
> + struct netlink_ext_ack *extack, \
> + u8 **data) \
> +{ \
> + return mv88e6xxx_region_port_snapshot(dl, extack, data, _X_); \
> +}
> +
> +PORT_SNAPSHOT(0);
> +PORT_SNAPSHOT(1);
> +PORT_SNAPSHOT(2);
> +PORT_SNAPSHOT(3);
> +PORT_SNAPSHOT(4);
> +PORT_SNAPSHOT(5);
> +PORT_SNAPSHOT(6);
> +PORT_SNAPSHOT(7);
> +PORT_SNAPSHOT(8);
> +PORT_SNAPSHOT(9);
> +PORT_SNAPSHOT(10);
> +PORT_SNAPSHOT(11);
> +
> +#define PORT_REGION_OPS(_X_) \
> +static struct devlink_region_ops mv88e6xxx_region_port_ ## _X_ ## _ops = { \
> + .name = "port" #_X_, \
> + .snapshot = mv88e6xxx_region_port_ ## _X_ ## _snapshot, \
> + .destructor = kfree, \
> +}
This is a little awkward, can we make devlink pass the region pointer
back to the callback instead? Plus perhaps an ability to allocate "priv"
data inside the region would also h
> +PORT_REGION_OPS(0);
> +PORT_REGION_OPS(1);
> +PORT_REGION_OPS(2);
> +PORT_REGION_OPS(3);
> +PORT_REGION_OPS(4);
> +PORT_REGION_OPS(5);
> +PORT_REGION_OPS(6);
> +PORT_REGION_OPS(7);
> +PORT_REGION_OPS(8);
> +PORT_REGION_OPS(9);
> +PORT_REGION_OPS(10);
> +PORT_REGION_OPS(11);
> +
> +static const struct devlink_region_ops *mv88e6xxx_region_port_ops[] = {
> + &mv88e6xxx_region_port_0_ops,
> + &mv88e6xxx_region_port_1_ops,
> + &mv88e6xxx_region_port_2_ops,
> + &mv88e6xxx_region_port_3_ops,
> + &mv88e6xxx_region_port_4_ops,
> + &mv88e6xxx_region_port_5_ops,
> + &mv88e6xxx_region_port_6_ops,
> + &mv88e6xxx_region_port_7_ops,
> + &mv88e6xxx_region_port_8_ops,
> + &mv88e6xxx_region_port_9_ops,
> + &mv88e6xxx_region_port_10_ops,
> + &mv88e6xxx_region_port_11_ops,
> +};
Ahh, seems like regions will get a per-port incarnation as some point as
well..
> +static int mv88e6xxx_setup_devlink_regions_ports(struct dsa_switch *ds,
> + struct mv88e6xxx_chip *chip)
> +{
> + int port, port_err;
> + int err;
> +
> + for (port = 0; port < mv88e6xxx_num_ports(chip); port++) {
> + err = mv88e6xxx_setup_devlink_regions_port(ds, chip, port);
> + if (err)
> + goto out;
> + }
> + return 0;
> +
> +out:
> + for (port_err = 0; port_err < port; port_err++)
> + mv88e6xxx_teardown_devlink_regions_port(chip, port_err);
FWIW I'd use
while (port--)
but some consider it error prone.
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