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authorArnaldo Carvalho de Melo <acme@ghostprotocols.net>2005-08-09 20:09:30 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 15:42:13 -0700
commit8feaf0c0a5488b3d898a9c207eb6678f44ba3f26 (patch)
treeddd004afe2f7c8295f6fdb94d34f78a42b5961cb /net/core
parent33b62231908c58ae04185e4f1063d1e35a7c8576 (diff)
[INET]: Generalise tcp_tw_bucket, aka TIME_WAIT sockets
This paves the way to generalise the rest of the sock ID lookup routines and saves some bytes in TCPv4 TIME_WAIT sockets on distro kernels (where IPv6 is always built as a module): [root@qemu ~]# grep tw_sock /proc/slabinfo tw_sock_TCPv6 0 0 128 31 1 tw_sock_TCP 0 0 96 41 1 [root@qemu ~]# Now if a protocol wants to use the TIME_WAIT generic infrastructure it only has to set the sk_prot->twsk_obj_size field with the size of its inet_timewait_sock derived sock and proto_register will create sk_prot->twsk_slab, for now its only for INET sockets, but we can introduce timewait_sock later if some non INET transport protocolo wants to use this stuff. Next changesets will take advantage of this new infrastructure to generalise even more TCP code. [acme@toy net-2.6.14]$ grep built-in /tmp/before.size /tmp/after.size /tmp/before.size: 188646 11764 5068 205478 322a6 net/ipv4/built-in.o /tmp/after.size: 188144 11764 5068 204976 320b0 net/ipv4/built-in.o [acme@toy net-2.6.14]$ Tested with both IPv4 & IPv6 (::1 (localhost) & ::ffff:172.20.0.1 (qemu host)). Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/sock.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index a1a23be10aa..aba31fedf2a 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1378,7 +1378,8 @@ static LIST_HEAD(proto_list);
int proto_register(struct proto *prot, int alloc_slab)
{
- char *request_sock_slab_name;
+ char *request_sock_slab_name = NULL;
+ char *timewait_sock_slab_name;
int rc = -ENOBUFS;
if (alloc_slab) {
@@ -1409,6 +1410,23 @@ int proto_register(struct proto *prot, int alloc_slab)
goto out_free_request_sock_slab_name;
}
}
+
+ if (prot->twsk_obj_size) {
+ static const char mask[] = "tw_sock_%s";
+
+ timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
+
+ if (timewait_sock_slab_name == NULL)
+ goto out_free_request_sock_slab;
+
+ sprintf(timewait_sock_slab_name, mask, prot->name);
+ prot->twsk_slab = kmem_cache_create(timewait_sock_slab_name,
+ prot->twsk_obj_size,
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL, NULL);
+ if (prot->twsk_slab == NULL)
+ goto out_free_timewait_sock_slab_name;
+ }
}
write_lock(&proto_list_lock);
@@ -1417,6 +1435,13 @@ int proto_register(struct proto *prot, int alloc_slab)
rc = 0;
out:
return rc;
+out_free_timewait_sock_slab_name:
+ kfree(timewait_sock_slab_name);
+out_free_request_sock_slab:
+ if (prot->rsk_prot && prot->rsk_prot->slab) {
+ kmem_cache_destroy(prot->rsk_prot->slab);
+ prot->rsk_prot->slab = NULL;
+ }
out_free_request_sock_slab_name:
kfree(request_sock_slab_name);
out_free_sock_slab:
@@ -1444,6 +1469,14 @@ void proto_unregister(struct proto *prot)
prot->rsk_prot->slab = NULL;
}
+ if (prot->twsk_slab != NULL) {
+ const char *name = kmem_cache_name(prot->twsk_slab);
+
+ kmem_cache_destroy(prot->twsk_slab);
+ kfree(name);
+ prot->twsk_slab = NULL;
+ }
+
list_del(&prot->node);
write_unlock(&proto_list_lock);
}