/*
* IEEE802.15.4-2003 specification
*
* Copyright (C) 2007-2012 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef NET_MAC802154_H
#define NET_MAC802154_H
#include <net/af_ieee802154.h>
#include <linux/ieee802154.h>
#include <linux/skbuff.h>
#include <linux/unaligned/memmove.h>
#include <net/cfg802154.h>
/* General MAC frame format:
* 2 bytes: Frame Control
* 1 byte: Sequence Number
* 20 bytes: Addressing fields
* 14 bytes: Auxiliary Security Header
*/
#define MAC802154_FRAME_HARD_HEADER_LEN (2 + 1 + 20 + 14)
/**
* enum ieee802154_hw_addr_filt_flags - hardware address filtering flags
*
* The following flags are used to indicate changed address settings from
* the stack to the hardware.
*
* @IEEE802154_AFILT_SADDR_CHANGED: Indicates that the short address will be
* change.
*
* @IEEE802154_AFILT_IEEEADDR_CHANGED: Indicates that the extended address
* will be change.
*
* @IEEE802154_AFILT_PANID_CHANGED: Indicates that the pan id will be change.
*
* @IEEE802154_AFILT_PANC_CHANGED: Indicates that the address filter will
* do frame address filtering as a pan coordinator.
*/
enum ieee802154_hw_addr_filt_flags {
IEEE802154_AFILT_SADDR_CHANGED = BIT(1),
IEEE802154_AFILT_IEEEADDR_CHANGED = BIT(2),
IEEE802154_AFILT_PANID_CHANGED = BIT(3),
IEEE802154_AFILT_PANC_CHANGED = BIT(4),
};
struct ieee802154_hw_addr_filt {
__le16 pan_id; /* Each independent PAN selects a unique
* identifier. This PAN id allows communication
* between devices within a network using short
* addresses and enables transmissions between
* devices across independent networks.
*/
__le16 short_addr;
__le64 ieee_addr;
u8 pan_coord;
};
struct ieee802154_hw {
/* filled by the driver */
int extra_tx_headroom;
u32 flags;
struct device *parent;
/* filled by mac802154 core */
void *priv;
struct wpan_phy *phy;
};
/**
* enum ieee802154_hw_flags - hardware flags
*
* These flags are used to indicate hardware capabilities to
* the stack. Generally, flags here should have their meaning
* done in a way that the simplest hardware doesn't need setting
* any particular flags. There are some exceptions to this rule,
* however, so you are advised to review these flags carefully.
*
* @IEEE802154_HW_TX_OMIT_CKSUM: Indicates that xmitter will add FCS on it's
* own.
*
* @IEEE802154_HW_LBT: Indicates that transceiver will support listen before
* transmit.
*
* @IEEE802154_HW_CSMA_PARAMS: Indicates that transceiver will support csma
* parameters (max_be, min_be, backoff exponents).
*
* @IEEE802154_HW_FRAME_RETRIES: Indicates that transceiver will support ARET
* frame retries setting.
*
* @IEEE802154_HW_AFILT: Indicates that transceiver will support hardware
* address filter setting.
*
* @IEEE802154_HW_PROMISCUOUS: Indicates that transceiver will support
* promiscuous mode setting.
*
* @IEEE802154_HW_RX_OMIT_CKSUM: Indicates that receiver omits FCS.
*
* @IEEE802154_HW_RX_DROP_BAD_CKSUM: Indicates that receiver will not filter
* frames with bad checksum.
*/
enum ieee802154_hw_flags {
IEEE802154_HW_TX_OMIT_CKSUM = BIT(1),
IEEE802154_HW_LBT = BIT(2),
IEEE802154_HW_CSMA_PARAMS = BIT(3),
IEEE802154_HW_FRAME_RETRIES = BIT(4),
IEEE802154_HW_AFILT = BIT(5),
IEEE802154_HW_PROMISCUOUS = BIT(6),
IEEE802154_HW_RX_OMIT_CKSUM = BIT(7),
IEEE802154_HW_RX_DROP_BAD_CKSUM = BIT(8),
};
/* Indicates that receiver omits FCS and xmitter will add FCS on it's own. */
#define IEEE802154_HW_OMIT_CKSUM (IEEE802154_HW_TX_OMIT_CKSUM | \
IEEE802154_HW_RX_OMIT_CKSUM)
/* struct ieee802154_ops - callbacks from mac802154 to the driver
*
* This structure contains various callbacks that the driver may
* handle or, in some cases, must handle, for example to transmit
* a frame.
*
* start: Handler that 802.15.4 module calls for device initialization.
* This function is called before the first interface is attached.
*
* stop: Handler that 802.15.4 module calls for device cleanup.
* This function is called after the last interface is removed.
*
* xmit_sync:
* Handler that 802.15.4 module calls for each transmitted frame.
* skb cntains the buffer starting from the IEEE 802.15.4 header.
* The low-level driver should send the frame based on available
* configuration. This is called by a workqueue and useful for
* synchronous 802.15.4 drivers.
* This function should return zero or negative errno.
*
* WARNING:
* This will be deprecated soon. We don't accept synced xmit callbacks
* drivers anymore.
*
* xmit_async:
* Handler that 802.15.4 module calls for each transmitted frame.
* skb cntains the buffer starting from the IEEE 802.15.4 header.
* The low-level driver should send the frame based on available
* configuration.
* This function should return zero or negative errno.
*
* ed: Handler that 802.15.4 module calls for Energy Detection.
* This function should place the value for detected energy
* (usually device-dependant) in the level pointer and return
* either zero or negative errno. Called with pib_lock held.
*
* set_channel:
* Set radio for listening on specific channel.
* Set the device for listening on specified channel.
* Returns either zero, or negative errno. Called with pib_lock held.
*
* set_hw_addr_filt:
* Set radio for listening on specific address.
* Set the device for listening on specified address.
* Returns either zero, or negative errno.
*
* set_txpower:
* Set radio transmit power in mBm. Called with pib_lock held.
* Returns either zero, or negative errno.
*
* set_lbt
* Enables or disables listen before talk on the device. Called with
* pib_lock held.
* Returns either zero, or negative errno.
*
* set_cca_mode
* Sets the CCA mode used by the device. Called with pib_lock held.
* Returns either zero, or negative errno.
*
* set_cca_ed_level
* Sets the CCA energy detection threshold in mBm. Called with pib_lock
* held.
* Returns either zero, or negative errno.
*
* set_csma_params
* Sets the CSMA parameter set for the PHY. Called with pib_lock held.
* Returns either zero, or negative errno.
*
* set_frame_retries
* Sets the retransmission attempt limit. Called with pib_lock held.
* Returns either zero, or negative errno.
*
* set_promiscuous_mode
* Enables or disable promiscuous mode.
*/
struct ieee802154_ops {
struct module *owner;
int (*start)(struct ieee802154_hw *hw);
void (*stop)(struct ieee802154_hw *hw);
int (*xmit_sync)(struct ieee802154_hw *hw,
struct sk_buff *skb);
int (*xmit_async)(struct ieee802154_hw *hw,
struct sk_buff *skb);
int (*ed)(struct ieee802154_hw *hw, u8 *level);
int (*set_channel)(struct ieee802154_hw *hw, u8 page,
u8 channel);
int (*set_hw_addr_filt)(struct ieee802154_hw *hw,
struct ieee802154_hw_addr_filt *filt,
unsigned long changed);
int (*set_txpower)(struct ieee802154_hw *hw, s32 mbm);
int (*set_lbt)(struct ieee802154_hw *hw, bool on);
int (*set_cca_mode)(struct ieee802154_hw *hw,
const struct wpan_phy_cca *cca);
int (*set_cca_ed_level)(struct ieee802154_hw *hw, s32 mbm);
int (*set_csma_params)(struct ieee802154_hw *hw,
u8 min_be, u8 max_be, u8 retries);
int (*set_frame_retries)(struct ieee802154_hw *hw,
s8 retries);
int (*set_promiscuous_mode)(struct ieee802154_hw *hw,
const bool on);
};
/**
* ieee802154_be64_to_le64 - copies and convert be64 to le64
* @le64_dst: le64 destination pointer
* @be64_src: be64 source pointer
*/
static inline void ieee802154_be64_to_le64(void *le64_dst, const void *be64_src)
{
__put_unaligned_memmove64(swab64p(be64_src), le64_dst);
}
/**
* ieee802154_le64_to_be64 - copies and convert le64 to be64
* @be64_dst: be64 destination pointer
* @le64_src: le64 source pointer
*/
static inline void ieee802154_le64_to_be64(void *be64_dst, const void *le64_src)
{
__put_unaligned_memmove64(swab64p(le64_src), be64_dst);
}
/**
* ieee802154_alloc_hw - Allocate a new hardware device
*
* This must be called once for each hardware device. The returned pointer
* must be used to refer to this device when calling other functions.
* mac802154 allocates a private data area for the driver pointed to by
* @priv in &struct ieee802154_hw, the size of this area is given as
* @priv_data_len.
*
* @priv_data_len: length of private data
* @ops: callbacks for this device
*
* Return: A pointer to the new hardware device, or %NULL on error.
*/
struct ieee802154_hw *
ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops);
/**
* ieee802154_free_hw - free hardware descriptor
*
* This function frees everything that was allocated, including the
* private data for the driver. You must call ieee802154_unregister_hw()
* before calling this function.
*
* @hw: the hardware to free
*/
void ieee802154_free_hw(struct ieee802154_hw *hw);
/**
* ieee802154_register_hw - Register hardware device
*
* You must call this function before any other functions in
* mac802154. Note that before a hardware can be registered, you
* need to fill the contained wpan_phy's information.
*
* @hw: the device to register as returned by ieee802154_alloc_hw()
*
* Return: 0 on success. An error code otherwise.
*/
int ieee802154_register_hw(struct ieee802154_hw *hw);
/**
* ieee802154_unregister_hw - Unregister a hardware device
*
* This function instructs mac802154 to free allocated resources
* and unregister netdevices from the networking subsystem.
*
* @hw: the hardware to unregister
*/
void ieee802154_unregister_hw(struct ieee802154_hw *hw);
/**
* ieee802154_rx - receive frame
*
* Use this function to hand received frames to mac802154. The receive
* buffer in @skb must start with an IEEE 802.15.4 header. In case of a
* paged @skb is used, the driver is recommended to put the ieee802154
* header of the frame on the linear part of the @skb to avoid memory
* allocation and/or memcpy by the stack.
*
* This function may not be called in IRQ context. Calls to this function
* for a single hardware must be synchronized against each other.
*
* @hw: the hardware this frame came in on
* @skb: the buffer to receive, owned by mac802154 after this call
*/
void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb);
/**
* ieee802154_rx_irqsafe - receive frame
*
* Like ieee802154_rx() but can be called in IRQ context
* (internally defers to a tasklet.)
*
* @hw: the hardware this frame came in on
* @skb: the buffer to receive, owned by mac802154 after this call
* @lqi: link quality indicator
*/
void ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb,
u8 lqi);
/**
* ieee802154_wake_queue - wake ieee802154 queue
* @hw: pointer as obtained from ieee802154_alloc_hw().
*
* Drivers should use this function instead of netif_wake_queue.
*/
void ieee802154_wake_queue(struct ieee802154_hw *hw);
/**
* ieee802154_stop_queue - stop ieee802154 queue
* @hw: pointer as obtained from ieee802154_alloc_hw().
*
* Drivers should use this function instead of netif_stop_queue.
*/
void ieee802154_stop_queue(struct ieee802154_hw *hw);
/**
* ieee802154_xmit_complete - frame transmission complete
*
* @hw: pointer as obtained from ieee802154_alloc_hw().
* @skb: buffer for transmission
* @ifs_handling: indicate interframe space handling
*/
void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
bool ifs_handling);
#endif /* NET_MAC802154_H */
