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Date: Fri, 20 Oct 2017 16:39:48 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Steve Lin <steven.lin1@...adcom.com>
Cc: netdev@...r.kernel.org, jiri@...lanox.com, davem@...emloft.net,
michael.chan@...adcom.com, linville@...driver.com,
gospo@...adcom.com
Subject: Re: [PATCH net-next v2 1/6] devlink: Add permanent config parameter
get/set operations
Thu, Oct 19, 2017 at 09:17:05PM CEST, steven.lin1@...adcom.com wrote:
>Add support for permanent config parameter get/set commands. Used
>for parameters held in NVRAM, persistent device configuration.
>
>Signed-off-by: Steve Lin <steven.lin1@...adcom.com>
>Acked-by: Andy Gospodarek <gospo@...adcom.com>
>---
> include/net/devlink.h | 3 +
> include/uapi/linux/devlink.h | 11 ++
> net/core/devlink.c | 234 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 248 insertions(+)
>
>diff --git a/include/net/devlink.h b/include/net/devlink.h
>index b9654e1..bd64623 100644
>--- a/include/net/devlink.h
>+++ b/include/net/devlink.h
>@@ -270,6 +270,9 @@ struct devlink_ops {
> int (*eswitch_inline_mode_set)(struct devlink *devlink, u8 inline_mode);
> int (*eswitch_encap_mode_get)(struct devlink *devlink, u8 *p_encap_mode);
> int (*eswitch_encap_mode_set)(struct devlink *devlink, u8 encap_mode);
>+ int (*perm_config_get)(struct devlink *devlink, u32 param, u32 *value);
>+ int (*perm_config_set)(struct devlink *devlink, u32 param, u32 value,
Please use enum instead of "u32 param". Also, what would happen if the
value is >u32, like string for example? I believe we need to take it into
the consideration for the UAPI sake.
[...]
>+
>+static int devlink_nl_single_param_set(struct sk_buff *msg,
>+ struct devlink *devlink,
>+ u32 param, u32 value)
>+{
>+ u32 orig_value;
>+ u8 need_restart;
>+ int err;
>+ const struct devlink_ops *ops = devlink->ops;
>+ struct nlattr *cfgparam_attr;
Reverse christmas tree please (this applies to all functions)
>+
>+ /* First get current value of parameter */
>+ err = ops->perm_config_get(devlink, param, &orig_value);
I'm missing why this is needed.
>+ if (err)
>+ return err;
>+
>+ /* Now set parameter */
>+ err = ops->perm_config_set(devlink, param, value, &need_restart);
>+ if (err)
>+ return err;
>+
>+ cfgparam_attr = nla_nest_start(msg, DEVLINK_ATTR_PERM_CONFIG);
>+ /* Update restart reqd - if any param needs restart, should be set */
>+ if (need_restart)
>+ err = nla_put_u8(msg,
>+ DEVLINK_ATTR_PERM_CONFIG_RESTART_REQUIRED, 1);
>+
>+ /* Since set was successful, write attr back to msg with orig val */
>+ err = nla_put_u32(msg, DEVLINK_ATTR_PERM_CONFIG_PARAMETER, param);
>+ err = nla_put_u32(msg, DEVLINK_ATTR_PERM_CONFIG_VALUE, orig_value);
Why to write it back?
>+
>+ nla_nest_end(msg, cfgparam_attr);
>+
>+ return 0;
>+}
>+
>+static int devlink_nl_cmd_perm_config_set_doit(struct sk_buff *skb,
>+ struct genl_info *info)
>+{
>+ struct devlink *devlink = info->user_ptr[0];
>+ struct sk_buff *msg;
>+ void *hdr;
>+ struct nlattr *attr;
>+ int rem;
>+ int err;
>+ u8 restart_reqd = 0;
>+ struct nlattr *cfgparam_attr;
>+ struct nlattr *tb[DEVLINK_ATTR_MAX + 1];
>+ u32 param;
>+ u32 value;
>+
>+ if (!devlink->ops || !devlink->ops->perm_config_get ||
>+ !devlink->ops->perm_config_set)
>+ return -EOPNOTSUPP;
>+
>+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
>+ if (!msg)
>+ return -ENOMEM;
>+
>+ hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
>+ &devlink_nl_family, 0, DEVLINK_CMD_PERM_CONFIG_SET);
>+ if (!hdr) {
>+ err = -EMSGSIZE;
>+ goto nla_msg_failure;
>+ }
>+
>+ err = devlink_nl_put_handle(msg, devlink);
>+ if (err)
>+ goto nla_put_failure;
>+
>+ cfgparam_attr = nla_nest_start(msg, DEVLINK_ATTR_PERM_CONFIGS);
>+
>+ nla_for_each_nested(attr, info->attrs[DEVLINK_ATTR_PERM_CONFIGS], rem) {
>+ err = nla_parse_nested(tb, DEVLINK_ATTR_MAX, attr,
>+ devlink_nl_policy, NULL);
>+ if (err)
>+ goto nla_nest_failure;
>+
>+ if (!tb[DEVLINK_ATTR_PERM_CONFIG_PARAMETER] ||
>+ !tb[DEVLINK_ATTR_PERM_CONFIG_VALUE])
>+ continue;
>+
>+ param = nla_get_u32(tb[DEVLINK_ATTR_PERM_CONFIG_PARAMETER]);
You should check it the "param" value is withing the enum boundary.
>+ value = nla_get_u32(tb[DEVLINK_ATTR_PERM_CONFIG_VALUE]);
>+ err = devlink_nl_single_param_set(msg, devlink, param,
>+ value);
>+ if (err)
>+ goto nla_nest_failure;
Wouldn't it make sense to rollback to old values if any of the config
parameters set would fail?
>+ }
>+
>+ nla_nest_end(msg, cfgparam_attr);
>+
>+ if (restart_reqd) {
>+ err = nla_put_u8(msg, DEVLINK_ATTR_PERM_CONFIG_RESTART_REQUIRED,
>+ restart_reqd);
>+ if (err)
>+ goto nla_put_failure;
>+ }
>+
>+ genlmsg_end(msg, hdr);
>+ return genlmsg_reply(msg, info);
>+
>+nla_nest_failure:
>+ nla_nest_cancel(msg, cfgparam_attr);
>+nla_put_failure:
>+ genlmsg_cancel(msg, hdr);
>+nla_msg_failure:
>+ return err;
>+}
>+
> int devlink_dpipe_match_put(struct sk_buff *skb,
> struct devlink_dpipe_match *match)
> {
>@@ -2291,6 +2509,8 @@ static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {
> [DEVLINK_ATTR_ESWITCH_ENCAP_MODE] = { .type = NLA_U8 },
> [DEVLINK_ATTR_DPIPE_TABLE_NAME] = { .type = NLA_NUL_STRING },
> [DEVLINK_ATTR_DPIPE_TABLE_COUNTERS_ENABLED] = { .type = NLA_U8 },
>+ [DEVLINK_ATTR_PERM_CONFIG_PARAMETER] = { .type = NLA_U32 },
>+ [DEVLINK_ATTR_PERM_CONFIG_VALUE] = { .type = NLA_U32 },
> };
>
> static const struct genl_ops devlink_nl_ops[] = {
>@@ -2451,6 +2671,20 @@ static const struct genl_ops devlink_nl_ops[] = {
> .flags = GENL_ADMIN_PERM,
> .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
> },
>+ {
>+ .cmd = DEVLINK_CMD_PERM_CONFIG_GET,
>+ .doit = devlink_nl_cmd_perm_config_get_doit,
>+ .policy = devlink_nl_policy,
>+ .flags = GENL_ADMIN_PERM,
>+ .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
>+ },
>+ {
>+ .cmd = DEVLINK_CMD_PERM_CONFIG_SET,
>+ .doit = devlink_nl_cmd_perm_config_set_doit,
>+ .policy = devlink_nl_policy,
>+ .flags = GENL_ADMIN_PERM,
>+ .internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
>+ },
> };
>
> static struct genl_family devlink_nl_family __ro_after_init = {
>--
>2.7.4
>
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