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net/tls: Read sk_prot once when building tls proto ops 

Apart from being a "tremendous" win when it comes to generated machine
code (see bloat-o-meter output for x86-64 below) this mainly prepares
ground for annotating access to sk_prot with READ_ONCE, so that we don't
pepper the code with access annotations and needlessly repeat loads.

add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-46 (-46)
Function                                     old     new   delta
tls_init                                     851     805     -46
Total: Before=21063, After=21017, chg -0.22%

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Sitnicki 2020-03-17 18:04:38 +01:00 committed by David S. Miller
parent f13fe3e60c
commit 5bb4c45d46
1 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
net/tls/tls_main.c
View File

@ -628,24 +628,25 @@ struct tls_context *tls_ctx_create(struct sock *sk)
static void tls_build_proto(struct sock *sk)
{
int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
const struct proto *prot = sk->sk_prot;
/* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
if (ip_ver == TLSV6 &&
unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
mutex_lock(&tcpv6_prot_mutex);
if (likely(sk->sk_prot != saved_tcpv6_prot)) {
build_protos(tls_prots[TLSV6], sk->sk_prot);
smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
if (likely(prot != saved_tcpv6_prot)) {
build_protos(tls_prots[TLSV6], prot);
smp_store_release(&saved_tcpv6_prot, prot);
}
mutex_unlock(&tcpv6_prot_mutex);
}
if (ip_ver == TLSV4 &&
unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
mutex_lock(&tcpv4_prot_mutex);
if (likely(sk->sk_prot != saved_tcpv4_prot)) {
build_protos(tls_prots[TLSV4], sk->sk_prot);
smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
if (likely(prot != saved_tcpv4_prot)) {
build_protos(tls_prots[TLSV4], prot);
smp_store_release(&saved_tcpv4_prot, prot);
}
mutex_unlock(&tcpv4_prot_mutex);
}