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authorJohannes Berg <johannes.berg@intel.com>2013-11-14 17:14:44 +0100
committerDavid S. Miller <davem@davemloft.net>2013-11-14 17:10:41 -0500
commitd91824c08fbcb265ec930d863fa905e8daa836a4 (patch)
tree2f3c2f27b68f46e1dc5e1fc3139cd52942f818b2 /net/netlink/genetlink.c
parent3686ec5e84977eddc796903177e7e0a122585c11 (diff)
downloadlinux-d91824c08fbcb265ec930d863fa905e8daa836a4.tar.gz
genetlink: register family ops as array
Instead of using a linked list, use an array. This reduces the data size needed by the users of genetlink, for example in wireless (net/wireless/nl80211.c) on 64-bit it frees up over 1K of data space. Remove the attempted sending of CTRL_CMD_NEWOPS ctrl event since genl_ctrl_event(CTRL_CMD_NEWOPS, ...) only returns -EINVAL anyway, therefore no such event could ever be sent. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink/genetlink.c')
-rw-r--r--net/netlink/genetlink.c78
1 files changed, 33 insertions, 45 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index fbccb45e8cc..d8273b05776 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -108,11 +108,11 @@ static struct genl_family *genl_family_find_byname(char *name)
static struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family)
{
- struct genl_ops *ops;
+ int i;
- list_for_each_entry(ops, &family->ops_list, ops_list)
- if (ops->cmd == cmd)
- return ops;
+ for (i = 0; i < family->n_ops; i++)
+ if (family->ops[i].cmd == cmd)
+ return &family->ops[i];
return NULL;
}
@@ -283,33 +283,30 @@ static void genl_unregister_mc_groups(struct genl_family *family)
__genl_unregister_mc_group(family, grp);
}
-static int genl_register_ops(struct genl_family *family, struct genl_ops *ops)
+static int genl_validate_add_ops(struct genl_family *family, struct genl_ops *ops,
+ unsigned int n_ops)
{
- int err = -EINVAL;
-
- if (ops->dumpit == NULL && ops->doit == NULL)
- goto errout;
-
- if (genl_get_cmd(ops->cmd, family)) {
- err = -EEXIST;
- goto errout;
+ int i, j;
+
+ for (i = 0; i < n_ops; i++) {
+ if (ops[i].dumpit == NULL && ops[i].doit == NULL)
+ return -EINVAL;
+ for (j = i + 1; j < n_ops; j++)
+ if (ops[i].cmd == ops[j].cmd)
+ return -EINVAL;
+ if (ops[i].dumpit)
+ ops[i].flags |= GENL_CMD_CAP_DUMP;
+ if (ops[i].doit)
+ ops[i].flags |= GENL_CMD_CAP_DO;
+ if (ops[i].policy)
+ ops[i].flags |= GENL_CMD_CAP_HASPOL;
}
- if (ops->dumpit)
- ops->flags |= GENL_CMD_CAP_DUMP;
- if (ops->doit)
- ops->flags |= GENL_CMD_CAP_DO;
- if (ops->policy)
- ops->flags |= GENL_CMD_CAP_HASPOL;
-
- genl_lock_all();
- list_add_tail(&ops->ops_list, &family->ops_list);
- genl_unlock_all();
+ /* family is not registered yet, so no locking needed */
+ family->ops = ops;
+ family->n_ops = n_ops;
- genl_ctrl_event(CTRL_CMD_NEWOPS, ops);
- err = 0;
-errout:
- return err;
+ return 0;
}
/**
@@ -333,7 +330,6 @@ int __genl_register_family(struct genl_family *family)
if (family->id > GENL_MAX_ID)
goto errout;
- INIT_LIST_HEAD(&family->ops_list);
INIT_LIST_HEAD(&family->mcast_groups);
genl_lock_all();
@@ -405,21 +401,13 @@ EXPORT_SYMBOL(__genl_register_family);
int __genl_register_family_with_ops(struct genl_family *family,
struct genl_ops *ops, size_t n_ops)
{
- int err, i;
+ int err;
- err = __genl_register_family(family);
+ err = genl_validate_add_ops(family, ops, n_ops);
if (err)
return err;
- for (i = 0; i < n_ops; ++i, ++ops) {
- err = genl_register_ops(family, ops);
- if (err)
- goto err_out;
- }
- return 0;
-err_out:
- genl_unregister_family(family);
- return err;
+ return __genl_register_family(family);
}
EXPORT_SYMBOL(__genl_register_family_with_ops);
@@ -444,7 +432,7 @@ int genl_unregister_family(struct genl_family *family)
continue;
list_del(&rc->family_list);
- INIT_LIST_HEAD(&family->ops_list);
+ family->n_ops = 0;
genl_unlock_all();
kfree(family->attrbuf);
@@ -671,19 +659,19 @@ static int ctrl_fill_info(struct genl_family *family, u32 portid, u32 seq,
nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr))
goto nla_put_failure;
- if (!list_empty(&family->ops_list)) {
+ if (family->n_ops) {
struct nlattr *nla_ops;
- struct genl_ops *ops;
- int idx = 1;
+ int i;
nla_ops = nla_nest_start(skb, CTRL_ATTR_OPS);
if (nla_ops == NULL)
goto nla_put_failure;
- list_for_each_entry(ops, &family->ops_list, ops_list) {
+ for (i = 0; i < family->n_ops; i++) {
struct nlattr *nest;
+ struct genl_ops *ops = &family->ops[i];
- nest = nla_nest_start(skb, idx++);
+ nest = nla_nest_start(skb, i + 1);
if (nest == NULL)
goto nla_put_failure;