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authorJakub Kicinski <jakub.kicinski@netronome.com>2017-10-09 10:30:14 -0700
committerDavid S. Miller <davem@davemloft.net>2017-10-10 12:30:16 -0700
commitd66f2b91f95b56e31772b9faa0d036cd2e53cb02 (patch)
tree7443577f00bc649d464047dba4b3ece5fa0fb7e2 /net/core/dst.c
parentc9c35995bcf812ee8136f634c25bc6ccc3021d4c (diff)
downloadlinux-d66f2b91f95b56e31772b9faa0d036cd2e53cb02.tar.bz2
bpf: don't rely on the verifier lock for metadata_dst allocation
bpf_skb_set_tunnel_*() functions require allocation of per-cpu metadata_dst. The allocation happens upon verification of the first program using those helpers. In preparation for removing the verifier lock, use cmpxchg() to make sure we only allocate the metadata_dsts once. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dst.c')
-rw-r--r--net/core/dst.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/net/core/dst.c b/net/core/dst.c
index a6c47da7d0f8..8b2eafac984d 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -322,3 +322,19 @@ metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags)
return md_dst;
}
EXPORT_SYMBOL_GPL(metadata_dst_alloc_percpu);
+
+void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst)
+{
+ int cpu;
+
+#ifdef CONFIG_DST_CACHE
+ for_each_possible_cpu(cpu) {
+ struct metadata_dst *one_md_dst = per_cpu_ptr(md_dst, cpu);
+
+ if (one_md_dst->type == METADATA_IP_TUNNEL)
+ dst_cache_destroy(&one_md_dst->u.tun_info.dst_cache);
+ }
+#endif
+ free_percpu(md_dst);
+}
+EXPORT_SYMBOL_GPL(metadata_dst_free_percpu);