6.6-stable review patch. If anyone has any objections, please let me know.
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From: Florian Westphal fw@strlen.de
[ Upstream commit 5a8cdf6fd860ac5e6d08d72edbcecee049a7fec4 ]
use ->scratch for both avx2 and the generic implementation.
After previous change the scratch->map member is always aligned properly for AVX2, so we can just use scratch->map in AVX2 too.
The alignoff delta is stored in the scratchpad so we can reconstruct the correct address to free the area again.
Fixes: 7400b063969b ("nft_set_pipapo: Introduce AVX2-based lookup implementation") Reviewed-by: Stefano Brivio sbrivio@redhat.com Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/netfilter/nft_set_pipapo.c | 41 +++++------------------------ net/netfilter/nft_set_pipapo.h | 6 ++--- net/netfilter/nft_set_pipapo_avx2.c | 2 +- 3 files changed, 10 insertions(+), 39 deletions(-)
diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c index b6bca59b7ba6..8e9b20077966 100644 --- a/net/netfilter/nft_set_pipapo.c +++ b/net/netfilter/nft_set_pipapo.c @@ -1116,6 +1116,7 @@ static void pipapo_free_scratch(const struct nft_pipapo_match *m, unsigned int c return;
mem = s; + mem -= s->align_off; kfree(mem); }
@@ -1135,6 +1136,7 @@ static int pipapo_realloc_scratch(struct nft_pipapo_match *clone, struct nft_pipapo_scratch *scratch; #ifdef NFT_PIPAPO_ALIGN void *scratch_aligned; + u32 align_off; #endif scratch = kzalloc_node(struct_size(scratch, map, bsize_max * 2) + @@ -1153,8 +1155,6 @@ static int pipapo_realloc_scratch(struct nft_pipapo_match *clone,
pipapo_free_scratch(clone, i);
- *per_cpu_ptr(clone->scratch, i) = scratch; - #ifdef NFT_PIPAPO_ALIGN /* Align &scratch->map (not the struct itself): the extra * %NFT_PIPAPO_ALIGN_HEADROOM bytes passed to kzalloc_node() @@ -1166,8 +1166,12 @@ static int pipapo_realloc_scratch(struct nft_pipapo_match *clone,
scratch_aligned = NFT_PIPAPO_LT_ALIGN(&scratch->map); scratch_aligned -= offsetof(struct nft_pipapo_scratch, map); - *per_cpu_ptr(clone->scratch_aligned, i) = scratch_aligned; + align_off = scratch_aligned - (void *)scratch; + + scratch = scratch_aligned; + scratch->align_off = align_off; #endif + *per_cpu_ptr(clone->scratch, i) = scratch; }
return 0; @@ -1320,11 +1324,6 @@ static struct nft_pipapo_match *pipapo_clone(struct nft_pipapo_match *old) if (!new->scratch) goto out_scratch;
-#ifdef NFT_PIPAPO_ALIGN - new->scratch_aligned = alloc_percpu(*new->scratch_aligned); - if (!new->scratch_aligned) - goto out_scratch; -#endif for_each_possible_cpu(i) *per_cpu_ptr(new->scratch, i) = NULL;
@@ -1377,9 +1376,6 @@ static struct nft_pipapo_match *pipapo_clone(struct nft_pipapo_match *old) out_scratch_realloc: for_each_possible_cpu(i) pipapo_free_scratch(new, i); -#ifdef NFT_PIPAPO_ALIGN - free_percpu(new->scratch_aligned); -#endif out_scratch: free_percpu(new->scratch); kfree(new); @@ -1666,11 +1662,7 @@ static void pipapo_free_match(struct nft_pipapo_match *m) for_each_possible_cpu(i) pipapo_free_scratch(m, i);
-#ifdef NFT_PIPAPO_ALIGN - free_percpu(m->scratch_aligned); -#endif free_percpu(m->scratch); - pipapo_free_fields(m);
kfree(m); @@ -2165,16 +2157,6 @@ static int nft_pipapo_init(const struct nft_set *set, for_each_possible_cpu(i) *per_cpu_ptr(m->scratch, i) = NULL;
-#ifdef NFT_PIPAPO_ALIGN - m->scratch_aligned = alloc_percpu(struct nft_pipapo_scratch *); - if (!m->scratch_aligned) { - err = -ENOMEM; - goto out_free; - } - for_each_possible_cpu(i) - *per_cpu_ptr(m->scratch_aligned, i) = NULL; -#endif - rcu_head_init(&m->rcu);
nft_pipapo_for_each_field(f, i, m) { @@ -2205,9 +2187,6 @@ static int nft_pipapo_init(const struct nft_set *set, return 0;
out_free: -#ifdef NFT_PIPAPO_ALIGN - free_percpu(m->scratch_aligned); -#endif free_percpu(m->scratch); out_scratch: kfree(m); @@ -2261,9 +2240,6 @@ static void nft_pipapo_destroy(const struct nft_ctx *ctx,
nft_set_pipapo_match_destroy(ctx, set, m);
-#ifdef NFT_PIPAPO_ALIGN - free_percpu(m->scratch_aligned); -#endif for_each_possible_cpu(cpu) pipapo_free_scratch(m, cpu); free_percpu(m->scratch); @@ -2278,9 +2254,6 @@ static void nft_pipapo_destroy(const struct nft_ctx *ctx, if (priv->dirty) nft_set_pipapo_match_destroy(ctx, set, m);
-#ifdef NFT_PIPAPO_ALIGN - free_percpu(priv->clone->scratch_aligned); -#endif for_each_possible_cpu(cpu) pipapo_free_scratch(priv->clone, cpu); free_percpu(priv->clone->scratch); diff --git a/net/netfilter/nft_set_pipapo.h b/net/netfilter/nft_set_pipapo.h index 75b1340c6335..a4a58812c108 100644 --- a/net/netfilter/nft_set_pipapo.h +++ b/net/netfilter/nft_set_pipapo.h @@ -133,10 +133,12 @@ struct nft_pipapo_field { /** * struct nft_pipapo_scratch - percpu data used for lookup and matching * @map_index: Current working bitmap index, toggled between field matches + * @align_off: Offset to get the originally allocated address * @map: store partial matching results during lookup */ struct nft_pipapo_scratch { u8 map_index; + u32 align_off; unsigned long map[]; };
@@ -144,16 +146,12 @@ struct nft_pipapo_scratch { * struct nft_pipapo_match - Data used for lookup and matching * @field_count Amount of fields in set * @scratch: Preallocated per-CPU maps for partial matching results - * @scratch_aligned: Version of @scratch aligned to NFT_PIPAPO_ALIGN bytes * @bsize_max: Maximum lookup table bucket size of all fields, in longs * @rcu Matching data is swapped on commits * @f: Fields, with lookup and mapping tables */ struct nft_pipapo_match { int field_count; -#ifdef NFT_PIPAPO_ALIGN - struct nft_pipapo_scratch * __percpu *scratch_aligned; -#endif struct nft_pipapo_scratch * __percpu *scratch; size_t bsize_max; struct rcu_head rcu; diff --git a/net/netfilter/nft_set_pipapo_avx2.c b/net/netfilter/nft_set_pipapo_avx2.c index 78213c73af2e..90e275bb3e5d 100644 --- a/net/netfilter/nft_set_pipapo_avx2.c +++ b/net/netfilter/nft_set_pipapo_avx2.c @@ -1139,7 +1139,7 @@ bool nft_pipapo_avx2_lookup(const struct net *net, const struct nft_set *set, */ kernel_fpu_begin_mask(0);
- scratch = *raw_cpu_ptr(m->scratch_aligned); + scratch = *raw_cpu_ptr(m->scratch); if (unlikely(!scratch)) { kernel_fpu_end(); return false;