tree 4ea55487cebc9fc74006dd32161a677e64896f47
parent f3c9f95056acab715328ee63a80ddf5fd32c0a28
author Philipp Kirchhofer <philipp@familie-kirchhofer.de> 1445176963 +0200
committer David S. Miller <davem@davemloft.net> 1445438198 -0700

net: mv643xx_eth: Ensure proper data alignment in TSO TX path

The TX DMA engine requires that buffers with a size of 8 bytes or smaller
must be 64 bit aligned. This requirement may be violated when doing TSO,
as in this case larger skb frags can be broken up and transmitted in small
parts with then inappropriate alignment.

Fix this by checking for proper alignment before handing a buffer to the
DMA engine. If the data is misaligned realign it by copying it into the
TSO header data area.

Signed-off-by: Philipp Kirchhofer <philipp@familie-kirchhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>