On 3/15/2017 5:52 PM, Tom Lendacky wrote:
On 3/15/2017 5:41 PM, David Miller wrote:
From: Tom Lendacky <thomas.lenda...@amd.com>
Date: Wed, 15 Mar 2017 17:40:51 -0500
On 3/15/2017 5:37 PM, David Miller wrote:
From: Tom Lendacky <thomas.lenda...@amd.com>
Date: Wed, 15 Mar 2017 15:11:23 -0500
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.lenda...@amd.com>
Applied, thanks Tom.
Thanks David. This is another patch for 4.10 stable. Can you please
queue it up?
Can you properly state this in your patch postings, instead of always
mentioning it later?
Sorry, yes, I can do that. I didn't realize you preferred it that way.
Do you want the "Cc" tag to stable included in the patch or just
mention the stable targets in the patch description? I know you
coordinate the stable submissions and I don't want to mess anything up.
Never mind, just found the section in the netdev-FAQ.txt file that talks
about it. Sorry to bother you.
Thanks,
Tom
Thanks,
Tom
Thank you.
