amd-xgbe: Fix jumbo MTU processing on newer hardware

Browse source

Newer hardware does not provide a cumulative payload length when multiple
descriptors are needed to handle the data. Once the MTU increases beyond
the size that can be handled by a single descriptor, the SKB does not get
built properly by the driver.

The driver will now calculate the size of the data buffers used by the
hardware.  The first buffer of the first descriptor is for packet headers
or packet headers and data when the headers can't be split. Subsequent
descriptors in a multi-descriptor chain will not use the first buffer. The
second buffer is used by all the descriptors in the chain for payload data.
Based on whether the driver is processing the first, intermediate, or last
descriptor it can calculate the buffer usage and build the SKB properly.

Tested and verified on both old and new hardware.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Lendacky, Thomas 2017-03-15 15:11:23 -05:00 • committed by David S. Miller

parent 5371bbf4b2

commit 622c36f143

3 changed files with 78 additions and 50 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

drivers/net/ethernet/amd/xgbe/xgbe-common.h

View file

20

drivers/net/ethernet/amd/xgbe/xgbe-dev.c

View file

102

drivers/net/ethernet/amd/xgbe/xgbe-drv.c

View file