[Intel-wired-lan] [next PATCH S21 09/14] i40e: use priv flags to control packet split
andrewx.bowers at intel.com
Tue Nov 10 20:48:16 UTC 2015
> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On
> Behalf Of Joshua Hay
> Sent: Friday, November 06, 2015 3:26 PM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [next PATCH S21 09/14] i40e: use priv flags to
> control packet split
> From: Jesse Brandeburg <jesse.brandeburg at intel.com>
> Ethtool priv flags implementation to enable or disable packet split, which is a
> hardware feature that inspects headers and will put headers in a separate
> DMA buffer from the payload data. The driver was automatically choosing to
> enable packet split in some cases and this gives the user the ability to turn it
> off/on explicitly.
> to query state:
> ethtool --show-priv-flags ethx
> to enable:
> ethtool --set-priv-flags ethx packet-split on to disable:
> ethtool --set-priv-flags ethx packet-split off
> Why would anyone want this?
> Because some environments benefit from header/data split in the
> buffer, and the driver defaults to one or the other depending on
> environment/kernel parameters.
> Why didn't you implement a generic ethtool control for this feature?
> Because Intel hardware is the only hardware that supports
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg at intel.com>
> Change-ID: I803121e1eecc9ccb2884031fd85dd1110b3af66d
> drivers/net/ethernet/intel/i40e/i40e.h | 1 +
> drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 27
> 2 files changed, 28 insertions(+)
Tested-by: Andrew Bowers <andrewx.bowers at intel.com>
Patch code changes correctly applied, ethtool shows new priv-flags, prif-flags can be manipulated using ethtool.
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