[Make-wifi-fast] [PATCH v4] mac80211: Move reorder-sensitive TX handlers to after TXQ dequeue.

Toke Høiland-Jørgensen toke at toke.dk
Tue Aug 30 09:17:36 EDT 2016

Toke Høiland-Jørgensen <toke at toke.dk> writes:

> The TXQ intermediate queues can cause packet reordering when more than
> one flow is active to a single station. Since some of the wifi-specific
> packet handling (notably sequence number and encryption handling) is
> sensitive to re-ordering, things break if they are applied before the
> TXQ.
> This splits up the TX handlers and fast_xmit logic into two parts: An
> early part and a late part. The former is applied before TXQ enqueue,
> and the latter after dequeue. The non-TXQ path just applies both parts
> at once.
> To avoid having to deal with fragmentation on dequeue, the split is set
> to be after the fragmentation handler. This means that some reordering
> of TX handlers is necessary, and some handlers had to be made aware of
> fragmentation due to this reordering.
> This approach avoids having to scatter special cases for when TXQ is
> enabled, at the cost of making the fast_xmit and TX handler code
> slightly more complex.
> Signed-off-by: Toke Høiland-Jørgensen <toke at toke.dk>

And here's a version suitable for dropping into a LEDE build... Just
stick it in package/kernel/mac80211/patches.


-------------- next part --------------
A non-text attachment was scrubbed...
Name: 345-mac80211-Move-reorder-sensitive-TX-handlers-to-af.patch
Type: text/x-diff
Size: 17528 bytes
Desc: not available
URL: <https://lists.bufferbloat.net/pipermail/make-wifi-fast/attachments/20160830/44cb41bf/attachment-0001.patch>

More information about the Make-wifi-fast mailing list