Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) .. SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) ==============================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) Netdev private dataroom for 6lowpan interfaces
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) ==============================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) All 6lowpan able net devices, means all interfaces with ARPHRD_6LOWPAN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) must have "struct lowpan_priv" placed at beginning of netdev_priv.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) The priv_size of each interface should be calculate by::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  dev->priv_size = LOWPAN_PRIV_SIZE(LL_6LOWPAN_PRIV_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) Where LL_PRIV_6LOWPAN_DATA is sizeof linklayer 6lowpan private data struct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) To access the LL_PRIV_6LOWPAN_DATA structure you can cast::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  lowpan_priv(dev)-priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) to your LL_6LOWPAN_PRIV_DATA structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) Before registering the lowpan netdev interface you must run::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  lowpan_netdev_setup(dev, LOWPAN_LLTYPE_FOOBAR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) wheres LOWPAN_LLTYPE_FOOBAR is a define for your 6LoWPAN linklayer type of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) enum lowpan_lltypes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) Example to evaluate the private usually you can do::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  static inline struct lowpan_priv_foobar *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  lowpan_foobar_priv(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	return (struct lowpan_priv_foobar *)lowpan_priv(dev)->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)  switch (dev->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  case ARPHRD_6LOWPAN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	lowpan_priv = lowpan_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	/* do great stuff which is ARPHRD_6LOWPAN related */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	switch (lowpan_priv->lltype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	case LOWPAN_LLTYPE_FOOBAR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		/* do 802.15.4 6LoWPAN handling here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		lowpan_foobar_priv(dev)->bar = foo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)  ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)  }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) In case of generic 6lowpan branch ("net/6lowpan") you can remove the check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) on ARPHRD_6LOWPAN, because you can be sure that these function are called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) by ARPHRD_6LOWPAN interfaces.