tree b50e0fff4d9c7d589069986b0a7a9e3abf4113c3
parent 4c7b2ff9ad128d9a756148329d9d67f3fcdbb0e0
author Johannes Berg <johannes.berg@intel.com> 1428667810 +0200
committer Marty Faltesek <mfaltesek@google.com> 1431393922 -0400

mac80211: allow checksum offload only in fast-xmit

When we go through the complete TX processing, there are a number
of things like fragmentation and software crypto that require the
checksum to be calculated already.

In favour of maintainability, instead of adding the necessary call
to skb_checksum_help() in all the places that need it, just do it
once before the regular TX processing.

Right now this only affects the TI wlcore and QCA ath10k drivers
since they're the only ones using checksum offload. The previous
commits enabled fast-xmit for them in almost all cases.

For wlcore this even fixes a corner case: when a key fails to be
programmed to hardware software encryption gets used, encrypting
frames with a bad checksum.

Change-Id: I02c752dff59882b2d4e75c645398b66ee9274296
Signed-off-by: Johannes Berg <johannes.berg@intel.com>