package/kernel/mac80211/patches/subsys/308-net-fq_impl-use-skb_get_hash-instead-of-skb_get_hash.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Sun, 26 Jul 2020 14:37:02 +0200
   3 Subject: [PATCH] net/fq_impl: use skb_get_hash instead of
   4  skb_get_hash_perturb
   5
   6 This avoids unnecessary regenerating of the skb flow hash
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 ---
  10
  11 --- a/include/net/fq.h
  12 +++ b/include/net/fq.h
  13 @@ -69,15 +69,6 @@ struct fq {
  14         struct list_head backlogs;
  15         spinlock_t lock;
  16         u32 flows_cnt;
  17 -#if LINUX_VERSION_IS_GEQ(5,3,10) || \
  18 -    LINUX_VERSION_IN_RANGE(4,19,83, 4,20,0) || \
  19 -    LINUX_VERSION_IN_RANGE(4,14,153, 4,15,0) || \
  20 -    LINUX_VERSION_IN_RANGE(4,9,200, 4,10,0) || \
  21 -    LINUX_VERSION_IN_RANGE(4,4,200, 4,5,0)
  22 -       siphash_key_t   perturbation;
  23 -#else
  24 -       u32 perturbation;
  25 -#endif
  26         u32 limit;
  27         u32 memory_limit;
  28         u32 memory_usage;
  29 --- a/include/net/fq_impl.h
  30 +++ b/include/net/fq_impl.h
  31 @@ -108,15 +108,7 @@ begin:
  32
  33  static u32 fq_flow_idx(struct fq *fq, struct sk_buff *skb)
  34  {
  35 -#if LINUX_VERSION_IS_GEQ(5,3,10) || \
  36 -    LINUX_VERSION_IN_RANGE(4,19,83, 4,20,0) || \
  37 -    LINUX_VERSION_IN_RANGE(4,14,153, 4,15,0) || \
  38 -    LINUX_VERSION_IN_RANGE(4,9,200, 4,10,0) || \
  39 -    LINUX_VERSION_IN_RANGE(4,4,200, 4,5,0)
  40 -       u32 hash = skb_get_hash_perturb(skb, &fq->perturbation);
  41 -#else
  42 -       u32 hash = skb_get_hash_perturb(skb, fq->perturbation);
  43 -#endif
  44 +       u32 hash = skb_get_hash(skb);
  45
  46         return reciprocal_scale(hash, fq->flows_cnt);
  47  }
  48 @@ -316,7 +308,6 @@ static int fq_init(struct fq *fq, int fl
  49         INIT_LIST_HEAD(&fq->backlogs);
  50         spin_lock_init(&fq->lock);
  51         fq->flows_cnt = max_t(u32, flows_cnt, 1);
  52 -       get_random_bytes(&fq->perturbation, sizeof(fq->perturbation));
  53         fq->quantum = 300;
  54         fq->limit = 8192;
  55         fq->memory_limit = 16 << 20; /* 16 MBytes */