net/fq_impl: use skb_get_hash instead of skb_get_hash_perturb

This avoids unnecessarily regenerating the skb flow hash

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

include/net/fq.h

···
 	struct list_head backlogs;
 	spinlock_t lock;
 	u32 flows_cnt;
-	siphash_key_t	perturbation;
 	u32 limit;
 	u32 memory_limit;
 	u32 memory_usage;

include/net/fq_impl.h

···
 
 static u32 fq_flow_idx(struct fq *fq, struct sk_buff *skb)
 {
-	u32 hash = skb_get_hash_perturb(skb, &fq->perturbation);
+	u32 hash = skb_get_hash(skb);
 
 	return reciprocal_scale(hash, fq->flows_cnt);
 }
···
 	INIT_LIST_HEAD(&fq->backlogs);
 	spin_lock_init(&fq->lock);
 	fq->flows_cnt = max_t(u32, flows_cnt, 1);
-	get_random_bytes(&fq->perturbation, sizeof(fq->perturbation));
 	fq->quantum = 300;
 	fq->limit = 8192;
 	fq->memory_limit = 16 << 20; /* 16 MBytes */