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tcp: add tcp_rx_skb_cache sysctl

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Instead of relying on rps_needed, it is safer to use a separate
static key, since we do not want to enable TCP rx_skb_cache
by default. This feature can cause huge increase of memory
usage on hosts with millions of sockets.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2019-06-14 16:22:19 -07:00
committed by David S. Miller
parent a8e11e5c56
commit ede61ca474
3 changed files with 19 additions and 4 deletions
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6
include/net/sock.h
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@@ -2433,13 +2433,11 @@ static inline void skb_setup_tx_timestamp(struct sk_buff *skb, __u16 tsflags)
* This routine must be called with interrupts disabled or with the socket
* locked so that the sk_buff queue operation is ok.
*/
DECLARE_STATIC_KEY_FALSE(tcp_rx_skb_cache_key);
static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb)
{
__skb_unlink(skb, &sk->sk_receive_queue);
if (
#ifdef CONFIG_RPS
!static_branch_unlikely(&rps_needed) &&
#endif
if (static_branch_unlikely(&tcp_rx_skb_cache_key) &&
!sk->sk_rx_skb_cache) {
sk->sk_rx_skb_cache = skb;
skb_orphan(skb);