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net: shaper: implement introspection support

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The netlink op is a simple wrapper around the device callback.

Extend the existing fetch_dev() helper adding an attribute argument
for the requested device. Reuse such helper in the newly implemented
operation.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Link: https://patch.msgid.link/66eb62f22b3a5ba06ca91d01ae77515e5f447e15.1728460186.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2024-10-09 10:09:55 +02:00 committed by Jakub Kicinski
parent 14bba9285a
commit 553ea9f1ef
1 changed files with 95 additions and 3 deletions
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98
net/shaper/shaper.c
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@ -601,22 +601,29 @@ int net_shaper_nl_post_dumpit(struct netlink_callback *cb)
int net_shaper_nl_cap_pre_doit(const struct genl_split_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
return -EOPNOTSUPP;
return net_shaper_generic_pre(info, NET_SHAPER_A_CAPS_IFINDEX);
}
void net_shaper_nl_cap_post_doit(const struct genl_split_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
net_shaper_generic_post(info);
}
int net_shaper_nl_cap_pre_dumpit(struct netlink_callback *cb)
{
return -EOPNOTSUPP;
struct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb->ctx;
return net_shaper_ctx_setup(genl_info_dump(cb),
NET_SHAPER_A_CAPS_IFINDEX, ctx);
}
int net_shaper_nl_cap_post_dumpit(struct netlink_callback *cb)
{
return -EOPNOTSUPP;
struct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb->ctx;
net_shaper_ctx_cleanup(ctx);
return 0;
}
int net_shaper_nl_get_doit(struct sk_buff *skb, struct genl_info *info)
@ -1147,14 +1154,99 @@ int net_shaper_nl_group_doit(struct sk_buff *skb, struct genl_info *info)
goto free_leaves;
}
static int
net_shaper_cap_fill_one(struct sk_buff *msg,
struct net_shaper_binding *binding,
enum net_shaper_scope scope, unsigned long flags,
const struct genl_info *info)
{
unsigned long cur;
void *hdr;
hdr = genlmsg_iput(msg, info);
if (!hdr)
return -EMSGSIZE;
if (net_shaper_fill_binding(msg, binding, NET_SHAPER_A_CAPS_IFINDEX) ||
nla_put_u32(msg, NET_SHAPER_A_CAPS_SCOPE, scope))
goto nla_put_failure;
for (cur = NET_SHAPER_A_CAPS_SUPPORT_METRIC_BPS;
cur <= NET_SHAPER_A_CAPS_MAX; ++cur) {
if (flags & BIT(cur) && nla_put_flag(msg, cur))
goto nla_put_failure;
}
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
int net_shaper_nl_cap_get_doit(struct sk_buff *skb, struct genl_info *info)
{
struct net_shaper_binding *binding;
const struct net_shaper_ops *ops;
enum net_shaper_scope scope;
unsigned long flags = 0;
struct sk_buff *msg;
int ret;
if (GENL_REQ_ATTR_CHECK(info, NET_SHAPER_A_CAPS_SCOPE))
return -EINVAL;
binding = net_shaper_binding_from_ctx(info->ctx);
scope = nla_get_u32(info->attrs[NET_SHAPER_A_CAPS_SCOPE]);
ops = net_shaper_ops(binding);
ops->capabilities(binding, scope, &flags);
if (!flags)
return -EOPNOTSUPP;
msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
ret = net_shaper_cap_fill_one(msg, binding, scope, flags, info);
if (ret)
goto free_msg;
ret = genlmsg_reply(msg, info);
if (ret)
goto free_msg;
return 0;
free_msg:
nlmsg_free(msg);
return ret;
}
int net_shaper_nl_cap_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct genl_info *info = genl_info_dump(cb);
struct net_shaper_binding *binding;
const struct net_shaper_ops *ops;
enum net_shaper_scope scope;
int ret;
binding = net_shaper_binding_from_ctx(cb->ctx);
ops = net_shaper_ops(binding);
for (scope = 0; scope <= NET_SHAPER_SCOPE_MAX; ++scope) {
unsigned long flags = 0;
ops->capabilities(binding, scope, &flags);
if (!flags)
continue;
ret = net_shaper_cap_fill_one(skb, binding, scope, flags,
info);
if (ret)
return ret;
}
return 0;
}