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| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2019-05-08 16:46:14 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-05-09 11:13:57 -0700 |
| commit | 494bc1d281b5a9f02a81249fa566d8c7e390c50c (patch) | |
| tree | 2633fb42d8ca311f6fa75b4c60b90f7e3514ed68 /net/ipv4 | |
| parent | 70610c922bae2f3f974eef955ef254defb7755ce (diff) | |
| download | linux-stable-494bc1d281b5a9f02a81249fa566d8c7e390c50c.tar.gz linux-stable-494bc1d281b5a9f02a81249fa566d8c7e390c50c.tar.bz2 linux-stable-494bc1d281b5a9f02a81249fa566d8c7e390c50c.zip | |
net/tcp: use deferred jump label for TCP acked data hook
User space can flip the clean_acked_data_enabled static branch
on and off with TLS offload when CONFIG_TLS_DEVICE is enabled.
jump_label.h suggests we use the delayed version in this case.
Deferred branches now also don't take the branch mutex on
decrement, so we avoid potential locking issues.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_input.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 077d9abdfcf5..20f6fac5882e 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -77,7 +77,7 @@ #include <asm/unaligned.h> #include <linux/errqueue.h> #include <trace/events/tcp.h> -#include <linux/static_key.h> +#include <linux/jump_label_ratelimit.h> #include <net/busy_poll.h> int sysctl_tcp_max_orphans __read_mostly = NR_FILE; @@ -113,22 +113,28 @@ int sysctl_tcp_max_orphans __read_mostly = NR_FILE; #define REXMIT_NEW 2 /* FRTO-style transmit of unsent/new packets */ #if IS_ENABLED(CONFIG_TLS_DEVICE) -static DEFINE_STATIC_KEY_FALSE(clean_acked_data_enabled); +static DEFINE_STATIC_KEY_DEFERRED_FALSE(clean_acked_data_enabled, HZ); void clean_acked_data_enable(struct inet_connection_sock *icsk, void (*cad)(struct sock *sk, u32 ack_seq)) { icsk->icsk_clean_acked = cad; - static_branch_inc(&clean_acked_data_enabled); + static_branch_inc(&clean_acked_data_enabled.key); } EXPORT_SYMBOL_GPL(clean_acked_data_enable); void clean_acked_data_disable(struct inet_connection_sock *icsk) { - static_branch_dec(&clean_acked_data_enabled); + static_branch_slow_dec_deferred(&clean_acked_data_enabled); icsk->icsk_clean_acked = NULL; } EXPORT_SYMBOL_GPL(clean_acked_data_disable); + +void clean_acked_data_flush(void) +{ + static_key_deferred_flush(&clean_acked_data_enabled); +} +EXPORT_SYMBOL_GPL(clean_acked_data_flush); #endif static void tcp_gro_dev_warn(struct sock *sk, const struct sk_buff *skb, @@ -3598,7 +3604,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag) icsk->icsk_retransmits = 0; #if IS_ENABLED(CONFIG_TLS_DEVICE) - if (static_branch_unlikely(&clean_acked_data_enabled)) + if (static_branch_unlikely(&clean_acked_data_enabled.key)) if (icsk->icsk_clean_acked) icsk->icsk_clean_acked(sk, ack); #endif |