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Message-ID: <ce46643a-99ad-54e8-b5ed-b85ca35ecbcb@intel.com>
Date: Fri, 9 Apr 2021 09:51:13 -0700
From: "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To: Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
netdev@...r.kernel.org
Cc: jiri@...dia.com, davem@...emloft.net, linux-kernel@...r.kernel.org,
kuba@...nel.org, idosch@...sch.org, vadym.kochan@...ision.eu,
Parav Pandit <parav@...dia.com>
Subject: Re: [RFC] net: core: devlink: add port_params_ops for devlink port
parameters altering
On 4/9/2021 9:22 AM, Oleksandr Mazur wrote:
> I'd like to discuss a possibility of handling devlink port parameters
> with devlink port pointer supplied.
>
> Current design makes it impossible to distinguish which port's parameter
> should get altered (set) or retrieved (get) whenever there's a single
> parameter registered within a few ports.
I also noticed this issue recently when trying to add port parameters and
I have a patch that handles this in a different way. The ops in devlink_param
struct can be updated to include port_index as an argument
devlink: Fix devlink_param function pointers
devlink_param function pointers are used to register device parameters
as well as port parameters. So we need port_index also as an argument
to enable port specific parameters.
Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 57251d12b0fc..bf55acdf98ae 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -469,12 +469,12 @@ struct devlink_param {
bool generic;
enum devlink_param_type type;
unsigned long supported_cmodes;
- int (*get)(struct devlink *devlink, u32 id,
- struct devlink_param_gset_ctx *ctx);
- int (*set)(struct devlink *devlink, u32 id,
- struct devlink_param_gset_ctx *ctx);
- int (*validate)(struct devlink *devlink, u32 id,
- union devlink_param_value val,
+ int (*get)(struct devlink *devlink, unsigned int port_index,
+ u32 id, struct devlink_param_gset_ctx *ctx);
+ int (*set)(struct devlink *devlink, unsigned int port_index,
+ u32 id, struct devlink_param_gset_ctx *ctx);
+ int (*validate)(struct devlink *devlink, unsigned int port_index,
+ u32 id, union devlink_param_value val,
struct netlink_ext_ack *extack);
};
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 151f60af0c4a..65a819ead3d9 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3826,21 +3826,23 @@ devlink_param_cmode_is_supported(const struct devlink_param *param,
}
static int devlink_param_get(struct devlink *devlink,
+ unsigned int port_index,
const struct devlink_param *param,
struct devlink_param_gset_ctx *ctx)
{
if (!param->get)
return -EOPNOTSUPP;
- return param->get(devlink, param->id, ctx);
+ return param->get(devlink, port_index, param->id, ctx);
}
static int devlink_param_set(struct devlink *devlink,
+ unsigned int port_index,
const struct devlink_param *param,
struct devlink_param_gset_ctx *ctx)
{
if (!param->set)
return -EOPNOTSUPP;
- return param->set(devlink, param->id, ctx);
+ return param->set(devlink, port_index, param->id, ctx);
}
static int
@@ -3941,7 +3943,8 @@ static int devlink_nl_param_fill(struct sk_buff *msg, struct devlink *devlink,
if (!param_item->published)
continue;
ctx.cmode = i;
- err = devlink_param_get(devlink, param, &ctx);
+ err = devlink_param_get(devlink, port_index, param,
+ &ctx);
if (err)
return err;
param_value[i] = ctx.val;
@@ -4216,7 +4219,8 @@ static int __devlink_nl_cmd_param_set_doit(struct devlink *devlink,
if (err)
return err;
if (param->validate) {
- err = param->validate(devlink, param->id, value, info->extack);
+ err = param->validate(devlink, port_index, param->id, value,
+ info->extack);
if (err)
return err;
}
@@ -4238,7 +4242,7 @@ static int __devlink_nl_cmd_param_set_doit(struct devlink *devlink,
return -EOPNOTSUPP;
ctx.val = value;
ctx.cmode = cmode;
- err = devlink_param_set(devlink, param, &ctx);
+ err = devlink_param_set(devlink, port_index, param, &ctx);
if (err)
return err;
}
>
> This patch aims to show how this can be changed:
> - introduce structure port_params_ops that has callbacks for get/set/validate;
> - if devlink has registered port_params_ops, then upon every devlink
> port parameter get/set call invoke port parameters callback
>
> Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
> ---
> drivers/net/netdevsim/dev.c | 46 +++++++++++++++++++++++++++++++
> drivers/net/netdevsim/netdevsim.h | 1 +
> include/net/devlink.h | 11 ++++++++
> net/core/devlink.c | 16 ++++++++++-
> 4 files changed, 73 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
> index 6189a4c0d39e..4f9a3104ca46 100644
> --- a/drivers/net/netdevsim/dev.c
> +++ b/drivers/net/netdevsim/dev.c
> @@ -39,6 +39,11 @@ static struct dentry *nsim_dev_ddir;
>
> #define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)
>
> +static int nsim_dev_port_param_set(struct devlink_port *port, u32 id,
> + struct devlink_param_gset_ctx *ctx);
> +static int nsim_dev_port_param_get(struct devlink_port *port, u32 id,
> + struct devlink_param_gset_ctx *ctx);
> +
> static int
> nsim_dev_take_snapshot(struct devlink *devlink,
> const struct devlink_region_ops *ops,
> @@ -339,6 +344,7 @@ static int nsim_dev_resources_register(struct devlink *devlink)
> enum nsim_devlink_param_id {
> NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
> NSIM_DEVLINK_PARAM_ID_TEST1,
> + NSIM_DEVLINK_PARAM_ID_TEST2,
> };
>
> static const struct devlink_param nsim_devlink_params[] = {
> @@ -349,6 +355,10 @@ static const struct devlink_param nsim_devlink_params[] = {
> "test1", DEVLINK_PARAM_TYPE_BOOL,
> BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
> NULL, NULL, NULL),
> + DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST2,
> + "test1", DEVLINK_PARAM_TYPE_U32,
> + BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
> + NULL, NULL, NULL),
> };
>
> static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev,
> @@ -892,6 +902,11 @@ nsim_dev_devlink_trap_policer_counter_get(struct devlink *devlink,
> return 0;
> }
>
> +static const struct devlink_port_param_ops nsim_dev_port_param_ops = {
> + .get = nsim_dev_port_param_get,
> + .set = nsim_dev_port_param_set,
> +};
> +
> static const struct devlink_ops nsim_dev_devlink_ops = {
> .supported_flash_update_params = DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT |
> DEVLINK_SUPPORT_FLASH_UPDATE_OVERWRITE_MASK,
> @@ -905,6 +920,7 @@ static const struct devlink_ops nsim_dev_devlink_ops = {
> .trap_group_set = nsim_dev_devlink_trap_group_set,
> .trap_policer_set = nsim_dev_devlink_trap_policer_set,
> .trap_policer_counter_get = nsim_dev_devlink_trap_policer_counter_get,
> + .port_param_ops = &nsim_dev_port_param_ops,
> };
>
> #define NSIM_DEV_MAX_MACS_DEFAULT 32
> @@ -1239,6 +1255,36 @@ int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
> return err;
> }
>
> +static int nsim_dev_port_param_get(struct devlink_port *port, u32 id,
> + struct devlink_param_gset_ctx *ctx)
> +{
> + struct nsim_dev *nsim_dev = devlink_priv(port->devlink);
> + struct nsim_dev_port *nsim_port =
> + __nsim_dev_port_lookup(nsim_dev, port->index);
> +
> + if (id == NSIM_DEVLINK_PARAM_ID_TEST2) {
> + ctx->val.vu32 = nsim_port->test_parameter_value;
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int nsim_dev_port_param_set(struct devlink_port *port, u32 id,
> + struct devlink_param_gset_ctx *ctx)
> +{
> + struct nsim_dev *nsim_dev = devlink_priv(port->devlink);
> + struct nsim_dev_port *nsim_port =
> + __nsim_dev_port_lookup(nsim_dev, port->index);
> +
> + if (id == NSIM_DEVLINK_PARAM_ID_TEST2) {
> + nsim_port->test_parameter_value = ctx->val.vu32;
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> int nsim_dev_init(void)
> {
> nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
> diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
> index 7ff24e03577b..4f5fc491c8d6 100644
> --- a/drivers/net/netdevsim/netdevsim.h
> +++ b/drivers/net/netdevsim/netdevsim.h
> @@ -203,6 +203,7 @@ struct nsim_dev_port {
> unsigned int port_index;
> struct dentry *ddir;
> struct netdevsim *ns;
> + u32 test_parameter_value;
> };
>
> struct nsim_dev {
> diff --git a/include/net/devlink.h b/include/net/devlink.h
> index 853420db5d32..85a7b9970496 100644
> --- a/include/net/devlink.h
> +++ b/include/net/devlink.h
> @@ -1189,6 +1189,16 @@ enum devlink_trap_group_generic_id {
> .min_burst = _min_burst, \
> }
>
> +struct devlink_port_param_ops {
> + int (*get)(struct devlink_port *port, u32 id,
> + struct devlink_param_gset_ctx *ctx);
> + int (*set)(struct devlink_port *port, u32 id,
> + struct devlink_param_gset_ctx *ctx);
> + int (*validate)(struct devlink_port *port, u32 id,
> + union devlink_param_value val,
> + struct netlink_ext_ack *extack);
> +};
> +
> struct devlink_ops {
> /**
> * @supported_flash_update_params:
> @@ -1451,6 +1461,7 @@ struct devlink_ops {
> struct devlink_port *port,
> enum devlink_port_fn_state state,
> struct netlink_ext_ack *extack);
> + struct devlink_port_param_ops *port_param_ops;
> };
>
> static inline void *devlink_priv(struct devlink *devlink)
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index 737b61c2976e..20f3545f4e7b 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -3918,6 +3918,7 @@ static int devlink_nl_param_fill(struct sk_buff *msg, struct devlink *devlink,
> enum devlink_command cmd,
> u32 portid, u32 seq, int flags)
> {
> + struct devlink_port *dl_port;
> union devlink_param_value param_value[DEVLINK_PARAM_CMODE_MAX + 1];
> bool param_value_set[DEVLINK_PARAM_CMODE_MAX + 1] = {};
> const struct devlink_param *param = param_item->param;
> @@ -3941,7 +3942,20 @@ static int devlink_nl_param_fill(struct sk_buff *msg, struct devlink *devlink,
> if (!param_item->published)
> continue;
> ctx.cmode = i;
> - err = devlink_param_get(devlink, param, &ctx);
> + if ((cmd == DEVLINK_CMD_PORT_PARAM_GET ||
> + cmd == DEVLINK_CMD_PORT_PARAM_NEW ||
> + cmd == DEVLINK_CMD_PORT_PARAM_DEL) &&
> + devlink->ops->port_param_ops) {
> +
> + dl_port = devlink_port_get_by_index(devlink,
> + port_index);
> + err = devlink->ops->port_param_ops->get(dl_port,
> + param->id,
> + &ctx);
> + } else {
> + err = devlink_param_get(devlink, param, &ctx);
> + }
> +
> if (err)
> return err;
> param_value[i] = ctx.val;
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