[PATCH bpf-next v2 3/5] tcp: simplify tcp_set_congestion_control(): always reinitialize
From: Neal Cardwell <hidden>
Date: 2020-09-10 19:17:08
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [networking] (tcx & tc bpf, sock_addr), networking [general], networking [tcp], the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
From: Neal Cardwell <ncardwell@google.com> 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> Acked-by: Yuchung Cheng <redacted> Acked-by: Kevin Yang <redacted> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Lawrence Brakmo <redacted> --- include/net/tcp.h | 2 +- net/core/filter.c | 3 +-- net/ipv4/tcp.c | 2 +- net/ipv4/tcp_cong.c | 11 ++--------- 4 files changed, 5 insertions(+), 13 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index e85d564446c6..f857146c17a5 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h@@ -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);
diff --git a/net/core/filter.c b/net/core/filter.c
index 067f6759a68f..e89d6d7da03c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c@@ -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);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 7360d3db2b61..e58ab9db73ff 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c@@ -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);
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index d18d7a1ce4ce..a9b0fb52a1ec 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c@@ -341,7 +341,7 @@ int tcp_set_allowed_congestion_control(char *val) * 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; }
--
2.28.0.526.ge36021eeef-goog