• Johannes Berg's avatar
    mac80211: move TX PN to public part of key struct · db388a56
    Johannes Berg authored
    For drivers supporting TSO or similar features, but that still have
    PN assignment in software, there's a need to have some memory to
    store the current PN value. As mac80211 already stores this and it's
    somewhat complicated to add a per-driver area to the key struct (due
    to the dynamic sizing thereof) it makes sense to just move the TX PN
    to the keyconf, i.e. the public part of the key struct.
    
    As TKIP is more complicated and we won't able to offload it in this
    way right now (fast-xmit is skipped for TKIP unless the HW does it
    all, and our hardware needs MMIC calculation in software) I've not
    moved that for now - it's possible but requires exposing a lot of
    the internal TKIP state.
    
    As an bonus side effect, we can remove a lot of code by assuming the
    keyseq struct has a certain layout - with BUILD_BUG_ON to verify it.
    
    This might also improve performance, since now TX and RX no longer
    share a cacheline.
    Reviewed-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
    Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
    db388a56
key.h 4.52 KB