netdev - Re: [PATCH wpan-next v2 11/11] ieee802154: Give the user the association list

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Message-ID: <385bff6c-1322-d2ea-16df-6e005888db0b@datenfreihafen.org>
Date: Sat, 16 Sep 2023 17:36:41 +0200
From: Stefan Schmidt <stefan@...enfreihafen.org>
To: Miquel Raynal <miquel.raynal@...tlin.com>,
 Alexander Aring <alex.aring@...il.com>, linux-wpan@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
 David Girault <david.girault@...vo.com>,
 Romuald Despres <romuald.despres@...vo.com>,
 Frederic Blain <frederic.blain@...vo.com>,
 Nicolas Schodet <nico@...fr.eu.org>,
 Guilhem Imberton <guilhem.imberton@...vo.com>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH wpan-next v2 11/11] ieee802154: Give the user the
 association list

Hello Miquel.

On 01.09.23 19:05, Miquel Raynal wrote:
> Upon request, we must be able to provide to the user the list of
> associations currently in place. Let's add a new netlink command and
> attribute for this purpose.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>   include/net/nl802154.h    |  18 ++++++-
>   net/ieee802154/nl802154.c | 107 ++++++++++++++++++++++++++++++++++++++
>   2 files changed, 123 insertions(+), 2 deletions(-)
> 
> diff --git a/include/net/nl802154.h b/include/net/nl802154.h
> index 8b26faae49e8..4c752f799957 100644
> --- a/include/net/nl802154.h
> +++ b/include/net/nl802154.h
> @@ -81,6 +81,7 @@ enum nl802154_commands {
>   	NL802154_CMD_ASSOCIATE,
>   	NL802154_CMD_DISASSOCIATE,
>   	NL802154_CMD_SET_MAX_ASSOCIATIONS,
> +	NL802154_CMD_LIST_ASSOCIATIONS,
>   
>   	/* add new commands above here */
>   
> @@ -151,6 +152,7 @@ enum nl802154_attrs {
>   	NL802154_ATTR_SCAN_DONE_REASON,
>   	NL802154_ATTR_BEACON_INTERVAL,
>   	NL802154_ATTR_MAX_ASSOCIATIONS,
> +	NL802154_ATTR_PEER,
>   
>   	/* add attributes here, update the policy in nl802154.c */
>   
> @@ -389,8 +391,6 @@ enum nl802154_supported_bool_states {
>   	NL802154_SUPPORTED_BOOL_MAX = __NL802154_SUPPORTED_BOOL_AFTER_LAST - 1
>   };
>   
> -#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
> -
>   enum nl802154_dev_addr_modes {
>   	NL802154_DEV_ADDR_NONE,
>   	__NL802154_DEV_ADDR_INVALID,
> @@ -410,12 +410,26 @@ enum nl802154_dev_addr_attrs {
>   	NL802154_DEV_ADDR_ATTR_SHORT,
>   	NL802154_DEV_ADDR_ATTR_EXTENDED,
>   	NL802154_DEV_ADDR_ATTR_PAD,
> +	NL802154_DEV_ADDR_ATTR_PEER_TYPE,
>   
>   	/* keep last */
>   	__NL802154_DEV_ADDR_ATTR_AFTER_LAST,
>   	NL802154_DEV_ADDR_ATTR_MAX = __NL802154_DEV_ADDR_ATTR_AFTER_LAST - 1
>   };
>   
> +enum nl802154_peer_type {
> +	NL802154_PEER_TYPE_UNSPEC,
> +
> +	NL802154_PEER_TYPE_PARENT,
> +	NL802154_PEER_TYPE_CHILD,
> +
> +	/* keep last */
> +	__NL802154_PEER_TYPE_AFTER_LAST,
> +	NL802154_PEER_TYPE_MAX = __NL802154_PEER_TYPE_AFTER_LAST - 1
> +};
> +
> +#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
> +
>   enum nl802154_key_id_modes {
>   	NL802154_KEY_ID_MODE_IMPLICIT,
>   	NL802154_KEY_ID_MODE_INDEX,
> diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
> index e16e57fc34d0..e26d7cec02ce 100644
> --- a/net/ieee802154/nl802154.c
> +++ b/net/ieee802154/nl802154.c
> @@ -235,6 +235,7 @@ static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
>   	[NL802154_ATTR_BEACON_INTERVAL] =
>   		NLA_POLICY_MAX(NLA_U8, IEEE802154_ACTIVE_SCAN_DURATION),
>   	[NL802154_ATTR_MAX_ASSOCIATIONS] = { .type = NLA_U32 },
> +	[NL802154_ATTR_PEER] = { .type = NLA_NESTED },
>   
>   #ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
>   	[NL802154_ATTR_SEC_ENABLED] = { .type = NLA_U8, },
> @@ -1717,6 +1718,107 @@ static int nl802154_set_max_associations(struct sk_buff *skb, struct genl_info *
>   	return 0;
>   }
>   
> +static int nl802154_send_peer_info(struct sk_buff *msg,
> +				   struct netlink_callback *cb,
> +				   u32 seq, int flags,
> +				   struct cfg802154_registered_device *rdev,
> +				   struct wpan_dev *wpan_dev,
> +				   struct ieee802154_pan_device *peer,
> +				   enum nl802154_peer_type type)
> +{
> +	struct nlattr *nla;
> +	void *hdr;
> +
> +	ASSERT_RTNL();
> +
> +	hdr = nl802154hdr_put(msg, NETLINK_CB(cb->skb).portid, seq, flags,
> +			      NL802154_CMD_LIST_ASSOCIATIONS);
> +	if (!hdr)
> +		return -ENOBUFS;
> +
> +	genl_dump_check_consistent(cb, hdr);
> +
> +	if (nla_put_u32(msg, NL802154_ATTR_GENERATION,
> +			wpan_dev->association_generation))


This one still confuses me. I only ever see it increasing in the code. 
Did I miss something?

regards
Stefan Schmidt