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net: allow per netns sysctl_rmem and sysctl_wmem for protos

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As we want to gradually implement per netns sysctl_rmem and sysctl_wmem
on per protocol basis, add two new fields in struct proto,
and two new helpers : sk_get_wmem0() and sk_get_rmem0()

First user will be TCP. Then UDP and SCTP can be easily converted,
while DECNET probably wont get this support.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2017-11-07 00:29:27 -08:00
committed by David S. Miller
parent 2ea7a679ca
commit a3dcaf17ee
3 changed files with 29 additions and 5 deletions
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10
net/core/sock.c
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@@ -2346,16 +2346,18 @@ int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
/* guarantee minimum buffer size under pressure */
if (kind == SK_MEM_RECV) {
if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
return 1;
} else { /* SK_MEM_SEND */
int wmem0 = sk_get_wmem0(sk, prot);
if (sk->sk_type == SOCK_STREAM) {
if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
if (sk->sk_wmem_queued < wmem0)
return 1;
} else if (refcount_read(&sk->sk_wmem_alloc) <
prot->sysctl_wmem[0])
} else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
return 1;
}
}
if (sk_has_memory_pressure(sk)) {