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tcp: Disable optimisations for tcp_hash()

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I'm not sure if we're breaking some aliasing rule here, but with gcc
12.2.1 on x86_64 and -flto, the siphash_20b() call in tcp_hash()
doesn't see the connection address -- it gets all zeroes instead.

Fix this temporarily by disabling optimisations for this tcp_hash().

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2023-02-22 13:12:58 +01:00
parent 933aa1014b
commit 4ddbcb9c0c
1 changed files with 3 additions and 0 deletions
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3
tcp.c
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@ -1185,6 +1185,9 @@ static int tcp_hash_match(const struct tcp_tap_conn *conn,
#if TCP_HASH_NOINLINE
__attribute__((__noinline__)) /* See comment in Makefile */
#endif
__attribute__((optimize("O0"))) /* TODO: with -O2 and -flto on gcc 12.2,
* siphash_20b() doesn't see 'addr', why?
*/
static unsigned int tcp_hash(const struct ctx *c, const union inany_addr *addr,
in_port_t tap_port, in_port_t sock_port)
{