mac80211: implement codel on fair queuing flows
There is no other limit other than a global
packet count limit when using software queuing.
This means a single flow queue can grow insanely
long. This is particularly bad for TCP congestion
algorithms which requires a little more
sophisticated frame dropping scheme than a mere
headdrop on limit overflow.
Hence apply (a slighly modified, to fit the knobs)
CoDel5 on flow queues. This improves TCP
convergence and stability when combined with
wireless driver which keeps its own tx queue/fifo
at a minimum fill level for given link conditions.
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 6f8375f..54edfb6 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -812,10 +812,12 @@
* @tin: contains packets split into multiple flows
* @def_flow: used as a fallback flow when a packet destined to @tin hashes to
* a fq_flow which is already owned by a different tin
+ * @def_cvars: codel vars for @def_flow
*/
struct txq_info {
struct fq_tin tin;
struct fq_flow def_flow;
+ struct codel_vars def_cvars;
unsigned long flags;
/* keep last! */
@@ -1108,6 +1110,9 @@
struct ieee80211_hw hw;
struct fq fq;
+ struct codel_vars *cvars;
+ struct codel_params cparams;
+ struct codel_stats cstats;
const struct ieee80211_ops *ops;