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tcp/dccp: add SLAB_DESTROY_BY_RCU flag for request sockets 

Before letting request sockets being put in TCP/DCCP regular
ehash table, we need to add either :

- SLAB_DESTROY_BY_RCU flag to their kmem_cache
- add RCU grace period before freeing them.

Since we carefully respected the SLAB_DESTROY_BY_RCU protocol
like ESTABLISH and TIMEWAIT sockets, use it here.

req_prot_init() being only used by TCP and DCCP, I did not add
a new slab_flags into their rsk_prot, but reuse prot->slab_flags

Since all reqsk_alloc() users are correctly dealing with a failure,
add the __GFP_NOWARN flag to avoid traces under pressure.

Fixes: 079096f103 ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-03 06:27:28 -07:00 committed by David S. Miller
parent 4236e2a1ad
commit e96f78ab27
2 changed files with 4 additions and 2 deletions
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4
include/net/request_sock.h
View File

@ -82,7 +82,9 @@ static inline struct sock *req_to_sk(struct request_sock *req)
static inline struct request_sock *
reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener)
{
struct request_sock *req = kmem_cache_alloc(ops->slab, GFP_ATOMIC);
struct request_sock *req;
req = kmem_cache_alloc(ops->slab, GFP_ATOMIC | __GFP_NOWARN);
if (req) {
req->rsk_ops = ops;

2
net/core/sock.c
View File

@ -2758,7 +2758,7 @@ static int req_prot_init(const struct proto *prot)
rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
rsk_prot->obj_size, 0,
0, NULL);
prot->slab_flags, NULL);
if (!rsk_prot->slab) {
pr_crit("%s: Can't create request sock SLAB cache!\n",