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include/nuttx/net/netdev.h: Update some comments.

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This commit is contained in:
Gregory Nutt 2019-02-25 19:20:29 -06:00
parent 0951151c33
commit ef49b5e1b5
1 changed files with 5 additions and 2 deletions
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include/nuttx/net/netdev.h
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@ -288,15 +288,18 @@ struct net_driver_s
#endif
/* The d_buf array is used to hold incoming and outgoing packets. The
* device driver should place incoming data into this buffer. When sending
* device driver should place incoming data into this buffer. When sending
* data, the device driver should read the link level headers and the
* TCP/IP headers from this buffer. The size of the link level headers is
* TCP/IP headers from this buffer. The size of the link level headers is
* configured by the NET_LL_HDRLEN(dev) define.
*
* The network will handle only a single buffer for both incoming and
* outgoing packets. However, the driver design may be concurrently
* sending and filling separate, break-off buffers. That buffer
* management must be controlled by the driver.
*
* The d_buf array must be aligned to two-byte, 16-bit address boundaries
* in order to support aligned 16-bit accesses performed by the network.
*/
FAR uint8_t *d_buf;