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Date: Wed, 2 Jun 2021 00:06:17 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net-next 04/16] netfilter: nf_tables: prefer direct calls for set lookups
From: Florian Westphal <fw@...len.de>
Extend nft_set_do_lookup() to use direct calls when retpoline feature
is enabled.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_tables_core.h | 24 ++++++++++++++++++++
net/netfilter/nft_lookup.c | 31 ++++++++++++++++++++++++++
net/netfilter/nft_set_bitmap.c | 5 +++--
net/netfilter/nft_set_hash.c | 17 ++++++++------
net/netfilter/nft_set_pipapo.h | 2 --
net/netfilter/nft_set_pipapo_avx2.h | 2 --
net/netfilter/nft_set_rbtree.c | 5 +++--
7 files changed, 71 insertions(+), 15 deletions(-)
diff --git a/include/net/netfilter/nf_tables_core.h b/include/net/netfilter/nf_tables_core.h
index 5eb699454490..46c8d5bb5d8d 100644
--- a/include/net/netfilter/nf_tables_core.h
+++ b/include/net/netfilter/nf_tables_core.h
@@ -3,6 +3,7 @@
#define _NET_NF_TABLES_CORE_H
#include <net/netfilter/nf_tables.h>
+#include <linux/indirect_call_wrapper.h>
extern struct nft_expr_type nft_imm_type;
extern struct nft_expr_type nft_cmp_type;
@@ -88,12 +89,35 @@ extern const struct nft_set_type nft_set_bitmap_type;
extern const struct nft_set_type nft_set_pipapo_type;
extern const struct nft_set_type nft_set_pipapo_avx2_type;
+#ifdef CONFIG_RETPOLINE
+bool nft_rhash_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext);
+bool nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext);
+bool nft_bitmap_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext);
+bool nft_hash_lookup_fast(const struct net *net,
+ const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext);
+bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext);
+bool nft_set_do_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext);
+#else
static inline bool
nft_set_do_lookup(const struct net *net, const struct nft_set *set,
const u32 *key, const struct nft_set_ext **ext)
{
return set->ops->lookup(net, set, key, ext);
}
+#endif
+
+/* called from nft_pipapo_avx2.c */
+bool nft_pipapo_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext);
+/* called from nft_set_pipapo.c */
+bool nft_pipapo_avx2_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext);
struct nft_expr;
struct nft_regs;
diff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c
index 1a8581879af5..90becbf5bff3 100644
--- a/net/netfilter/nft_lookup.c
+++ b/net/netfilter/nft_lookup.c
@@ -23,6 +23,37 @@ struct nft_lookup {
struct nft_set_binding binding;
};
+#ifdef CONFIG_RETPOLINE
+bool nft_set_do_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext)
+{
+ if (set->ops == &nft_set_hash_fast_type.ops)
+ return nft_hash_lookup_fast(net, set, key, ext);
+ if (set->ops == &nft_set_hash_type.ops)
+ return nft_hash_lookup(net, set, key, ext);
+
+ if (set->ops == &nft_set_rhash_type.ops)
+ return nft_rhash_lookup(net, set, key, ext);
+
+ if (set->ops == &nft_set_bitmap_type.ops)
+ return nft_bitmap_lookup(net, set, key, ext);
+
+ if (set->ops == &nft_set_pipapo_type.ops)
+ return nft_pipapo_lookup(net, set, key, ext);
+#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
+ if (set->ops == &nft_set_pipapo_avx2_type.ops)
+ return nft_pipapo_avx2_lookup(net, set, key, ext);
+#endif
+
+ if (set->ops == &nft_set_rbtree_type.ops)
+ return nft_rbtree_lookup(net, set, key, ext);
+
+ WARN_ON_ONCE(1);
+ return set->ops->lookup(net, set, key, ext);
+}
+EXPORT_SYMBOL_GPL(nft_set_do_lookup);
+#endif
+
void nft_lookup_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
diff --git a/net/netfilter/nft_set_bitmap.c b/net/netfilter/nft_set_bitmap.c
index 2a81ea421819..e7ae5914971e 100644
--- a/net/netfilter/nft_set_bitmap.c
+++ b/net/netfilter/nft_set_bitmap.c
@@ -73,8 +73,9 @@ nft_bitmap_active(const u8 *bitmap, u32 idx, u32 off, u8 genmask)
return (bitmap[idx] & (0x3 << off)) & (genmask << off);
}
-static bool nft_bitmap_lookup(const struct net *net, const struct nft_set *set,
- const u32 *key, const struct nft_set_ext **ext)
+INDIRECT_CALLABLE_SCOPE
+bool nft_bitmap_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext)
{
const struct nft_bitmap *priv = nft_set_priv(set);
u8 genmask = nft_genmask_cur(net);
diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c
index 7b3d0a78c569..df40314de21f 100644
--- a/net/netfilter/nft_set_hash.c
+++ b/net/netfilter/nft_set_hash.c
@@ -74,8 +74,9 @@ static const struct rhashtable_params nft_rhash_params = {
.automatic_shrinking = true,
};
-static bool nft_rhash_lookup(const struct net *net, const struct nft_set *set,
- const u32 *key, const struct nft_set_ext **ext)
+INDIRECT_CALLABLE_SCOPE
+bool nft_rhash_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext)
{
struct nft_rhash *priv = nft_set_priv(set);
const struct nft_rhash_elem *he;
@@ -446,8 +447,9 @@ struct nft_hash_elem {
struct nft_set_ext ext;
};
-static bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
- const u32 *key, const struct nft_set_ext **ext)
+INDIRECT_CALLABLE_SCOPE
+bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext)
{
struct nft_hash *priv = nft_set_priv(set);
u8 genmask = nft_genmask_cur(net);
@@ -484,9 +486,10 @@ static void *nft_hash_get(const struct net *net, const struct nft_set *set,
return ERR_PTR(-ENOENT);
}
-static bool nft_hash_lookup_fast(const struct net *net,
- const struct nft_set *set,
- const u32 *key, const struct nft_set_ext **ext)
+INDIRECT_CALLABLE_SCOPE
+bool nft_hash_lookup_fast(const struct net *net,
+ const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext)
{
struct nft_hash *priv = nft_set_priv(set);
u8 genmask = nft_genmask_cur(net);
diff --git a/net/netfilter/nft_set_pipapo.h b/net/netfilter/nft_set_pipapo.h
index d84afb8fa79a..25a75591583e 100644
--- a/net/netfilter/nft_set_pipapo.h
+++ b/net/netfilter/nft_set_pipapo.h
@@ -178,8 +178,6 @@ struct nft_pipapo_elem {
int pipapo_refill(unsigned long *map, int len, int rules, unsigned long *dst,
union nft_pipapo_map_bucket *mt, bool match_only);
-bool nft_pipapo_lookup(const struct net *net, const struct nft_set *set,
- const u32 *key, const struct nft_set_ext **ext);
/**
* pipapo_and_field_buckets_4bit() - Intersect 4-bit buckets
diff --git a/net/netfilter/nft_set_pipapo_avx2.h b/net/netfilter/nft_set_pipapo_avx2.h
index 394bcb704db7..dbb6aaca8a7a 100644
--- a/net/netfilter/nft_set_pipapo_avx2.h
+++ b/net/netfilter/nft_set_pipapo_avx2.h
@@ -5,8 +5,6 @@
#include <asm/fpu/xstate.h>
#define NFT_PIPAPO_ALIGN (XSAVE_YMM_SIZE / BITS_PER_BYTE)
-bool nft_pipapo_avx2_lookup(const struct net *net, const struct nft_set *set,
- const u32 *key, const struct nft_set_ext **ext);
bool nft_pipapo_avx2_estimate(const struct nft_set_desc *desc, u32 features,
struct nft_set_estimate *est);
#endif /* defined(CONFIG_X86_64) && !defined(CONFIG_UML) */
diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c
index 9e36eb4a7429..d600a566da32 100644
--- a/net/netfilter/nft_set_rbtree.c
+++ b/net/netfilter/nft_set_rbtree.c
@@ -107,8 +107,9 @@ static bool __nft_rbtree_lookup(const struct net *net, const struct nft_set *set
return false;
}
-static bool nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
- const u32 *key, const struct nft_set_ext **ext)
+INDIRECT_CALLABLE_SCOPE
+bool nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
+ const u32 *key, const struct nft_set_ext **ext)
{
struct nft_rbtree *priv = nft_set_priv(set);
unsigned int seq = read_seqcount_begin(&priv->count);
--
2.30.2
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