From d91824c08fbcb265ec930d863fa905e8daa836a4 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 14 Nov 2013 17:14:44 +0100 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- include/net/genetlink.h | 7 ++-- net/netlink/genetlink.c | 78 +++++++++++++++++------------------------ 2 files changed, 37 insertions(+), 48 deletions(-) diff --git a/include/net/genetlink.h b/include/net/genetlink.h index 617d718524b0..d4802af1a8b3 100644 --- a/include/net/genetlink.h +++ b/include/net/genetlink.h @@ -39,9 +39,10 @@ struct genl_info; * @post_doit: called after an operation's doit callback, it may * undo operations done by pre_doit, for example release locks * @attrbuf: buffer to store parsed attributes - * @ops_list: list of all assigned operations * @family_list: family list * @mcast_groups: multicast groups list + * @ops: the operations supported by this family (private) + * @n_ops: number of operations supported by this family (private) */ struct genl_family { unsigned int id; @@ -58,7 +59,8 @@ struct genl_family { struct sk_buff *skb, struct genl_info *info); struct nlattr ** attrbuf; /* private */ - struct list_head ops_list; /* private */ + struct genl_ops * ops; /* private */ + unsigned int n_ops; /* private */ struct list_head family_list; /* private */ struct list_head mcast_groups; /* private */ struct module *module; @@ -119,7 +121,6 @@ struct genl_ops { int (*dumpit)(struct sk_buff *skb, struct netlink_callback *cb); int (*done)(struct netlink_callback *cb); - struct list_head ops_list; }; int __genl_register_family(struct genl_family *family); diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index fbccb45e8cc1..d8273b057763 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; -- 2.39.5