[PATCH wpan-next 1/2] net: ieee802154: Handle limited devices with only datagram support

[Miquel Raynal <miquel.raynal@bootlin.com>]

Some devices, like HardMAC ones can be a bit limited in the way they
handle mac commands. In particular, they might just not support it at
all and instead only be able to transmit and receive regular data
packets. In this case, they cannot be used for any of the internal
management commands that we have introduced so far and must be flagged
accordingly.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 include/net/cfg802154.h   |  3 +++
 net/ieee802154/nl802154.c | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
index 0c2778a836db..e00057984489 100644
--- a/include/net/cfg802154.h
+++ b/include/net/cfg802154.h
@@ -178,12 +178,15 @@ wpan_phy_cca_cmp(const struct wpan_phy_cca *a, const struct wpan_phy_cca *b)
  *	setting.
  * @WPAN_PHY_FLAG_STATE_QUEUE_STOPPED: Indicates that the transmit queue was
  *	temporarily stopped.
+ * @WPAN_PHY_FLAG_DATAGRAMS_ONLY: Indicates that transceiver is only able to
+ *	send/receive datagrams.
  */
 enum wpan_phy_flags {
 	WPAN_PHY_FLAG_TXPOWER		= BIT(1),
 	WPAN_PHY_FLAG_CCA_ED_LEVEL	= BIT(2),
 	WPAN_PHY_FLAG_CCA_MODE		= BIT(3),
 	WPAN_PHY_FLAG_STATE_QUEUE_STOPPED = BIT(4),
+	WPAN_PHY_FLAG_DATAGRAMS_ONLY	= BIT(5),
 };
 
 struct wpan_phy {
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 0ecc49d9c8c9..052c1ecfa300 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1417,6 +1417,11 @@ static int nl802154_trigger_scan(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 	}
 
+	if (wpan_phy->flags & WPAN_PHY_FLAG_DATAGRAMS_ONLY) {
+		NL_SET_ERR_MSG(info->extack, "PHY only supports datagrams");
+		return -EOPNOTSUPP;
+	}
+
 	request = kzalloc(sizeof(*request), GFP_KERNEL);
 	if (!request)
 		return -ENOMEM;
@@ -1584,6 +1589,11 @@ nl802154_send_beacons(struct sk_buff *skb, struct genl_info *info)
 		return -EPERM;
 	}
 
+	if (wpan_phy->flags & WPAN_PHY_FLAG_DATAGRAMS_ONLY) {
+		NL_SET_ERR_MSG(info->extack, "PHY only supports datagrams");
+		return -EOPNOTSUPP;
+	}
+
 	request = kzalloc(sizeof(*request), GFP_KERNEL);
 	if (!request)
 		return -ENOMEM;
-- 
2.34.1