net/fq_impl: drop get_default_func, move default flow to fq_tin

Simplifies the code and prepares for a rework of scanning for flows on
overmemory drop.

Signed-off-by: Felix Fietkau <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Johannes Berg <[e-mail]>

include/net/fq.h

···
 struct fq_tin {
 	struct list_head new_flows;
 	struct list_head old_flows;
+	struct fq_flow default_flow;
 	u32 backlog_bytes;
 	u32 backlog_packets;
 	u32 overlimit;

include/net/fq_impl.h

···
 
 static struct fq_flow *fq_flow_classify(struct fq *fq,
 					struct fq_tin *tin, u32 idx,
-					struct sk_buff *skb,
-					fq_flow_get_default_t get_default_func)
+					struct sk_buff *skb)
 {
 	struct fq_flow *flow;
 
···
 
 	flow = &fq->flows[idx];
 	if (flow->tin && flow->tin != tin) {
-		flow = get_default_func(fq, tin, idx, skb);
+		flow = &tin->default_flow;
 		tin->collisions++;
 		fq->collisions++;
 	}
···
 static void fq_tin_enqueue(struct fq *fq,
 			   struct fq_tin *tin, u32 idx,
 			   struct sk_buff *skb,
-			   fq_skb_free_t free_func,
-			   fq_flow_get_default_t get_default_func)
+			   fq_skb_free_t free_func)
 {
 	struct fq_flow *flow;
 	bool oom;
 
 	lockdep_assert_held(&fq->lock);
 
-	flow = fq_flow_classify(fq, tin, idx, skb, get_default_func);
+	flow = fq_flow_classify(fq, tin, idx, skb);
 
 	flow->tin = tin;
 	flow->backlog += skb->len;
···
 {
 	INIT_LIST_HEAD(&tin->new_flows);
 	INIT_LIST_HEAD(&tin->old_flows);
+	fq_flow_init(&tin->default_flow);
 }
 
 static int fq_init(struct fq *fq, int flows_cnt)

net/mac80211/ieee80211_i.h

···
  */
 struct txq_info {
 	struct fq_tin tin;
-	struct fq_flow def_flow;
 	struct codel_vars def_cvars;
 	struct codel_stats cstats;
 	struct sk_buff_head frags;

net/mac80211/tx.c

···
 	fq = &local->fq;
 
 	if (cvars == &txqi->def_cvars)
-		flow = &txqi->def_flow;
+		flow = &txqi->tin.default_flow;
 	else
 		flow = &fq->flows[cvars - local->cvars];
 
···
 		cparams = &local->cparams;
 	}
 
-	if (flow == &txqi->def_flow)
+	if (flow == &tin->default_flow)
 		cvars = &txqi->def_cvars;
 	else
 		cvars = &local->cvars[flow - fq->flows];
···
 	ieee80211_free_txskb(&local->hw, skb);
 }
 
-static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
-						struct fq_tin *tin,
-						int idx,
-						struct sk_buff *skb)
-{
-	struct txq_info *txqi;
-
-	txqi = container_of(tin, struct txq_info, tin);
-	return &txqi->def_flow;
-}
-
 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
 				  struct txq_info *txqi,
 				  struct sk_buff *skb)
···
 
 	spin_lock_bh(&fq->lock);
 	fq_tin_enqueue(fq, tin, flow_idx, skb,
-		       fq_skb_free_func,
-		       fq_flow_get_default_func);
+		       fq_skb_free_func);
 	spin_unlock_bh(&fq->lock);
 }
 
···
 			struct txq_info *txqi, int tid)
 {
 	fq_tin_init(&txqi->tin);
-	fq_flow_init(&txqi->def_flow);
 	codel_vars_init(&txqi->def_cvars);
 	codel_stats_init(&txqi->cstats);
 	__skb_queue_head_init(&txqi->frags);
···
 	 */
 
 	tin = &txqi->tin;
-	flow = fq_flow_classify(fq, tin, flow_idx, skb,
-				fq_flow_get_default_func);
+	flow = fq_flow_classify(fq, tin, flow_idx, skb);
 	head = skb_peek_tail(&flow->queue);
 	if (!head || skb_is_gso(head))
 		goto out;