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tcp: simplify tcp_set_congestion_control(): Always reinitialize 

Now that the previous patches ensure that all call sites for
tcp_set_congestion_control() want to initialize congestion control, we
can simplify tcp_set_congestion_control() by removing the reinit
argument and the code to support it.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Kevin Yang <yyd@google.com>
Cc: Lawrence Brakmo <brakmo@fb.com>
This commit is contained in:
Neal Cardwell 2020-09-10 15:35:34 -04:00 committed by Alexei Starovoitov
parent e7b10a4dd1
commit 29a949325c
4 changed files with 5 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/tcp.h
View File

@ -1104,7 +1104,7 @@ void tcp_get_available_congestion_control(char *buf, size_t len);
void tcp_get_allowed_congestion_control(char *buf, size_t len);
int tcp_set_allowed_congestion_control(char *allowed);
int tcp_set_congestion_control(struct sock *sk, const char *name, bool load,
bool reinit, bool cap_net_admin);
bool cap_net_admin);
u32 tcp_slow_start(struct tcp_sock *tp, u32 acked);
void tcp_cong_avoid_ai(struct tcp_sock *tp, u32 w, u32 acked);

3
net/core/filter.c
View File

@ -4451,8 +4451,7 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
strncpy(name, optval, min_t(long, optlen,
TCP_CA_NAME_MAX-1));
name[TCP_CA_NAME_MAX-1] = 0;
ret = tcp_set_congestion_control(sk, name, false,
true, true);
ret = tcp_set_congestion_control(sk, name, false, true);
} else {
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);

2
net/ipv4/tcp.c
View File

@ -3050,7 +3050,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
name[val] = 0;
lock_sock(sk);
err = tcp_set_congestion_control(sk, name, true, true,
err = tcp_set_congestion_control(sk, name, true,
ns_capable(sock_net(sk)->user_ns,
CAP_NET_ADMIN));
release_sock(sk);

11
net/ipv4/tcp_cong.c
View File

@ -341,7 +341,7 @@ out:
* already initialized.
*/
int tcp_set_congestion_control(struct sock *sk, const char *name, bool load,
bool reinit, bool cap_net_admin)
bool cap_net_admin)
{
struct inet_connection_sock *icsk = inet_csk(sk);
const struct tcp_congestion_ops *ca;
@ -365,15 +365,8 @@ int tcp_set_congestion_control(struct sock *sk, const char *name, bool load,
if (!ca) {
err = -ENOENT;
} else if (!load) {
const struct tcp_congestion_ops *old_ca = icsk->icsk_ca_ops;
if (bpf_try_module_get(ca, ca->owner)) {
if (reinit) {
tcp_reinit_congestion_control(sk, ca);
} else {
icsk->icsk_ca_ops = ca;
bpf_module_put(old_ca, old_ca->owner);
}
tcp_reinit_congestion_control(sk, ca);
} else {
err = -EBUSY;
}