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Date: Thu, 10 Aug 2023 16:38:36 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
jiri@...nulli.us,
johannes@...solutions.net,
Jakub Kicinski <kuba@...nel.org>,
Jiri Pirko <jiri@...dia.com>,
jacob.e.keller@...el.com
Subject: [PATCH net-next v2 01/10] genetlink: push conditional locking into dumpit/done
Add helpers which take/release the genl mutex based
on family->parallel_ops. Remove the separation between
handling of ops in locked and parallel families.
Future patches would make the duplicated code grow even more.
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Reviewed-by: Johannes Berg <johannes@...solutions.net>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
CC: jacob.e.keller@...el.com
---
net/netlink/genetlink.c | 90 ++++++++++++++++-------------------------
1 file changed, 35 insertions(+), 55 deletions(-)
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 6bd2ce51271f..0d4285688ab9 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -52,6 +52,18 @@ static void genl_unlock_all(void)
up_write(&cb_lock);
}
+static void genl_op_lock(const struct genl_family *family)
+{
+ if (!family->parallel_ops)
+ genl_lock();
+}
+
+static void genl_op_unlock(const struct genl_family *family)
+{
+ if (!family->parallel_ops)
+ genl_unlock();
+}
+
static DEFINE_IDR(genl_fam_idr);
/*
@@ -838,11 +850,9 @@ static int genl_start(struct netlink_callback *cb)
cb->data = info;
if (ops->start) {
- if (!ctx->family->parallel_ops)
- genl_lock();
+ genl_op_lock(ctx->family);
rc = ops->start(cb);
- if (!ctx->family->parallel_ops)
- genl_unlock();
+ genl_op_unlock(ctx->family);
}
if (rc) {
@@ -853,46 +863,34 @@ static int genl_start(struct netlink_callback *cb)
return rc;
}
-static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+static int genl_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
- const struct genl_split_ops *ops = &genl_dumpit_info(cb)->op;
+ const struct genl_dumpit_info *info = genl_dumpit_info(cb);
+ const struct genl_split_ops *ops = &info->op;
int rc;
- genl_lock();
+ genl_op_lock(info->family);
rc = ops->dumpit(skb, cb);
- genl_unlock();
+ genl_op_unlock(info->family);
return rc;
}
-static int genl_lock_done(struct netlink_callback *cb)
+static int genl_done(struct netlink_callback *cb)
{
const struct genl_dumpit_info *info = genl_dumpit_info(cb);
const struct genl_split_ops *ops = &info->op;
int rc = 0;
if (ops->done) {
- genl_lock();
+ genl_op_lock(info->family);
rc = ops->done(cb);
- genl_unlock();
+ genl_op_unlock(info->family);
}
genl_family_rcv_msg_attrs_free(info->attrs);
genl_dumpit_info_free(info);
return rc;
}
-static int genl_parallel_done(struct netlink_callback *cb)
-{
- const struct genl_dumpit_info *info = genl_dumpit_info(cb);
- const struct genl_split_ops *ops = &info->op;
- int rc = 0;
-
- if (ops->done)
- rc = ops->done(cb);
- genl_family_rcv_msg_attrs_free(info->attrs);
- genl_dumpit_info_free(info);
- return rc;
-}
-
static int genl_family_rcv_msg_dumpit(const struct genl_family *family,
struct sk_buff *skb,
struct nlmsghdr *nlh,
@@ -901,6 +899,14 @@ static int genl_family_rcv_msg_dumpit(const struct genl_family *family,
int hdrlen, struct net *net)
{
struct genl_start_context ctx;
+ struct netlink_dump_control c = {
+ .module = family->module,
+ .data = &ctx,
+ .start = genl_start,
+ .dump = genl_dumpit,
+ .done = genl_done,
+ .extack = extack,
+ };
int err;
ctx.family = family;
@@ -909,31 +915,9 @@ static int genl_family_rcv_msg_dumpit(const struct genl_family *family,
ctx.ops = ops;
ctx.hdrlen = hdrlen;
- if (!family->parallel_ops) {
- struct netlink_dump_control c = {
- .module = family->module,
- .data = &ctx,
- .start = genl_start,
- .dump = genl_lock_dumpit,
- .done = genl_lock_done,
- .extack = extack,
- };
-
- genl_unlock();
- err = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
- genl_lock();
- } else {
- struct netlink_dump_control c = {
- .module = family->module,
- .data = &ctx,
- .start = genl_start,
- .dump = ops->dumpit,
- .done = genl_parallel_done,
- .extack = extack,
- };
-
- err = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
- }
+ genl_op_unlock(family);
+ err = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
+ genl_op_lock(family);
return err;
}
@@ -1065,13 +1049,9 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
if (family == NULL)
return -ENOENT;
- if (!family->parallel_ops)
- genl_lock();
-
+ genl_op_lock(family);
err = genl_family_rcv_msg(family, skb, nlh, extack);
-
- if (!family->parallel_ops)
- genl_unlock();
+ genl_op_unlock(family);
return err;
}
--
2.41.0
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