- Generated on Fri Dec 20 2024 20:02:13 by
1.9.8
Structure to hold driver interface -> function mapping. More...
Structure to hold driver interface -> function mapping.
The send/receive functions expect/return a full ethernet frame (dst mac, src mac, ethertype, payload, no checksum).
#include <netdev.h>
Data Fields | |
| int(* | send )(netdev_t *dev, const iolist_t *iolist) |
| Start transmission of the given frame and return directly. | |
| int(* | confirm_send )(netdev_t *dev, void *info) |
| Fetch the status of a transmission and perform any potential cleanup. | |
| int(* | recv )(netdev_t *dev, void *buf, size_t len, void *info) |
| Drop a received frame, OR get the length of a received frame, OR get a received frame. | |
| int(* | init )(netdev_t *dev) |
| the driver's initialization function | |
| void(* | isr )(netdev_t *dev) |
| a driver's user-space ISR handler | |
| int(* | get )(netdev_t *dev, netopt_t opt, void *value, size_t max_len) |
| Get an option value from a given network device. | |
| int(* | set )(netdev_t *dev, netopt_t opt, const void *value, size_t value_len) |
| Set an option value for a given network device. | |
| int(* netdev_driver::confirm_send) (netdev_t *dev, void *info) |
Fetch the status of a transmission and perform any potential cleanup.
| [in] | dev | Network device descriptor. Must not be NULL. |
| [out] | info | Device class specific type to fetch transmission info. May be NULL if not needed by upper layer. May be ignored by driver. |
| -EAGAIN | Transmission still ongoing. (Call later again!) |
| -EHOSTUNREACH | Layer 2 ACK timeout |
| -EBUSY | Medium is busy. (E.g. Auto-CCA failed / timed out, collision detected) |
| -ENETDOWN | Interface is not connected / powered down |
| -EIO | Any kind of transmission error Use info for more details |
| <0 | Other error. (Please use a negative errno code.) |
-EAGAIN. -EAGAIN after that event was received. Get an option value from a given network device.
(dev != NULL) max_len must be of exactly that length (see netopt documentation for type) max_len must greater or equal the required length (see netopt documentation for type) value must have the natural alignment of its type (see netopt documentation for type)| [in] | dev | network device descriptor |
| [in] | opt | option type |
| [out] | value | pointer to store the option's value in |
| [in] | max_len | maximal amount of byte that fit into value |
value | -ENOTSUP | if opt is not provided by the device |
| int(* netdev_driver::init) (netdev_t *dev) |
| void(* netdev_driver::isr) (netdev_t *dev) |
a driver's user-space ISR handler
(dev != NULL)This function will be called from a network stack's loop when being notified by netdev_isr.
It is supposed to call netdev->event_callback() for each occurring event.
See receive frame flow description for details.
| [in] | dev | network device descriptor. Must not be NULL. |
| int(* netdev_driver::recv) (netdev_t *dev, void *buf, size_t len, void *info) |
Drop a received frame, OR get the length of a received frame, OR get a received frame.
(dev != NULL)Supposed to be called from netdev->event_callback()
If buf == NULL and len == 0, returns the frame size – or an upper bound estimation of the size – without dropping the frame. If buf == NULL and len > 0, drops the frame and returns the frame size.
If called with buf != NULL and len is smaller than the received frame:
buf becomes invalid. (The driver may use the memory to implement the dropping - or may not change it.)-ENOBUFS is returned| [in] | dev | network device descriptor. Must not be NULL. |
| [out] | buf | buffer to write into or NULL to return the frame size. |
| [in] | len | maximum number of bytes to read. If buf is NULL the currently buffered frame is dropped when len > 0. Must not be 0 when buf != NULL. |
| [out] | info | status information for the received frame. Might be of different type for different netdev devices. May be NULL if not needed or applicable. |
| -ENOBUFS | if supplied buffer is too small |
Start transmission of the given frame and return directly.
(dev != NULL) && (iolist != NULL)| [in] | dev | Network device descriptor. Must not be NULL. |
| [in] | iolist | IO vector list to send. Elements of this list may have iolist_t::iol_size == 0 and (in this case only) iolist_t::iol_data == 0. |
| -EBUSY | Driver is temporarily unable to send, e.g. because an incoming frame on a half-duplex medium is received |
| -ENETDOWN | Device is powered down |
| <0 | Other error |
| 0 | Transmission successfully started |
| >0 | Number of bytes transmitted (transmission already complete) |
This function will cause the driver to start the transmission in an async fashion. The driver will "own" the iolist until a subsequent call to netdev_driver_t::confirm_send returns something different than -EAGAIN. The driver must signal completion using the NETDEV_EVENT_TX_COMPLETE event, regardless of success or failure.
If the driver implements blocking send (e.g. because it writes out the frame byte-by-byte over a serial line) it can also return the number of bytes transmitted here directly. In this case it MUST NOT emit a NETDEV_EVENT_TX_COMPLETE event, netdev_driver_t::confirm_send will never be called but should still be implemented to signal conformance to the new API.
Old drivers might not be ported to the new API and have netdev_driver_t::confirm_send set to NULL. In that case the driver will return the number of bytes transmitted on success (instead of 0) and will likely block until completion.
Set an option value for a given network device.
(dev != NULL) value_len must be of exactly that length (see netopt documentation for type) value_len must lesser or equal the required length (see netopt documentation for type) value must have the natural alignment of its type (see netopt documentation for type)| [in] | dev | network device descriptor |
| [in] | opt | option type |
| [in] | value | value to set |
| [in] | value_len | the length of value |
value | -ENOTSUP | if opt is not configurable for the device |
| -EINVAL | if value is an invalid value with regards to opt |
1.9.8