GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

net: Add functions for handling padding frame and adding to length

Browse source 
This patch adds two new helper functions skb_put_padto and eth_skb_pad.
These functions deviate from the standard skb_pad or skb_padto in that they
will also update the length and tail pointers so that they reflect the
padding added to the frame.

The eth_skb_pad helper is meant to be used with Ethernet devices to update
either Rx or Tx frames so that they report the correct size.  The
skb_put_padto helper is meant to be used primarily in the transmit path for
network devices that need frames to be padded up to some minimum size and
don't wish to simply update the length somewhere external to the frame.

The motivation behind this is that there are a number of implementations
throughout the network device drivers that are all doing the same thing,
but each a little bit differently and as a result several implementations
contain bugs such as updating the length without updating the tail offset
and other similar issues.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2014-12-03 08:17:33 -08:00 • committed by David S. Miller
parent 177211b993
commit 9c0c112422
2 changed files with 35 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

12
include/linux/etherdevice.h
View file

@ -392,4 +392,16 @@ static inline unsigned long compare_ether_header(const void *a, const void *b)
#endif
}
/**
* eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame
* @skb: Buffer to pad
*
* An Ethernet frame should have a minimum size of 60 bytes. This function
* takes short frames and pads them with zeros up to the 60 byte limit.
*/
static inline int eth_skb_pad(struct sk_buff *skb)
{
return skb_put_padto(skb, ETH_ZLEN);
}
#endif /* _LINUX_ETHERDEVICE_H */