net: rtl8169: Properly align buffers
authorThierry Reding <treding@nvidia.com>
Wed, 10 Dec 2014 05:25:25 +0000 (22:25 -0700)
committerTom Warren <twarren@nvidia.com>
Thu, 18 Dec 2014 20:21:41 +0000 (13:21 -0700)
commitdad3ba0f0bb5ee2e87881c9f3a7ecfb8db384b2b
tree421e2053f773121ad771298d85b3d7d37f8a6018
parentc94bbfdf516e0ebaf2cb08025174f224c0b391f0
net: rtl8169: Properly align buffers

RX and TX descriptor rings should be aligned to 256 byte boundaries. Use
the DEFINE_ALIGN_BUFFER() macro to define the buffers so that they don't
have to be manually aligned later on. Also make sure that the buffers do
align to cache-line boundaries in case the cache-line is higher than the
256 byte alignment requirements of the NIC.

Also add a warning if the cache-line size is larger than the descriptor
size, because the driver may discard changes to descriptors made by the
hardware when requeuing RX buffers.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
drivers/net/rtl8169.c