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Message-Id: <47a018589c90c00026bef584ce4fa9356cdd973f.1638849511.git.lucien.xin@gmail.com>
Date: Mon, 6 Dec 2021 23:02:07 -0500
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>
Cc: Eric Dumazet <edumazet@...gle.com>, davem@...emloft.net,
kuba@...nel.org,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Davide Caratti <dcaratti@...hat.com>,
Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next 4/5] net: track in6_dev refcnt with obj_cnt
Two types are added into obj_cnt to count in6_dev_hold/get and in6_dev_put,
and all it does is put obj_cnt_track_by_dev() into these two functions.
Here is an example to track the refcnt of a in6_dev which is attached
on a netdev named dummy0:
# sysctl -w obj_cnt.control="clear" # clear the old result
# sysctl -w obj_cnt.type=0x30 # enable in6_dev_hold/put track
# sysctl -w obj_cnt.name=dummy0 # count in6_dev_hold/put(in6_dev)
# sysctl -w obj_cnt.nr_entries=4 # save 4 frames' call trace
# ip link add dummy0 type dummy
# ip link set dummy0 up
# ip addr add 2020::1/64 dev dummy0
# ip link set dummy0 down
# ip link del dummy0
# sysctl -w obj_cnt.control="scan" # print the new result
# dmesg
OBJ_CNT: obj_cnt_dump: obj: ffff8a1e17906000, type: in6_dev_put, cnt: 1,:
ipv6_mc_down+0x11e/0x1a0
addrconf_ifdown+0x53c/0x670
addrconf_notify+0xb8/0x940
raw_notifier_call_chain+0x41/0x50
OBJ_CNT: obj_cnt_dump: obj: ffff8a1e17906000, type: in6_dev_put, cnt: 1,:
ma_put+0x4f/0xb0
ipv6_mc_destroy_dev+0x150/0x180
addrconf_ifdown+0x478/0x670
addrconf_notify+0xb8/0x940
...
OBJ_CNT: obj_cnt_dump: obj: ffff8a1e17906000, type: in6_dev_hold, cnt: 2,:
fib6_nh_init+0x6b4/0x8f0
ip6_route_info_create+0x4f2/0x670
ip6_route_add+0x18/0x90
addrconf_prefix_route.isra.50+0x100/0x150
OBJ_CNT: obj_cnt_dump: obj: ffff8a1e17906000, type: in6_dev_hold, cnt: 2,:
fib6_nh_init+0x6b4/0x8f0
ip6_route_info_create+0x4f2/0x670
addrconf_f6i_alloc+0xe3/0x130
ipv6_add_addr+0x16a/0x740
...
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
include/linux/obj_cnt.h | 2 ++
include/net/addrconf.h | 7 ++++++-
lib/obj_cnt.c | 4 +++-
3 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/include/linux/obj_cnt.h b/include/linux/obj_cnt.h
index ae4c12beb876..f014b2e613d9 100644
--- a/include/linux/obj_cnt.h
+++ b/include/linux/obj_cnt.h
@@ -7,6 +7,8 @@ enum {
OBJ_CNT_DEV_PUT,
OBJ_CNT_DST_HOLD,
OBJ_CNT_DST_PUT,
+ OBJ_CNT_IN6_DEV_HOLD,
+ OBJ_CNT_IN6_DEV_PUT,
OBJ_CNT_TYPE_MAX
};
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 78ea3e332688..370a96b57dbd 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -357,8 +357,10 @@ static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
rcu_read_lock();
idev = rcu_dereference(dev->ip6_ptr);
- if (idev)
+ if (idev) {
+ obj_cnt_track_by_dev(idev, idev->dev, OBJ_CNT_IN6_DEV_HOLD);
refcount_inc(&idev->refcnt);
+ }
rcu_read_unlock();
return idev;
}
@@ -374,6 +376,7 @@ void in6_dev_finish_destroy(struct inet6_dev *idev);
static inline void in6_dev_put(struct inet6_dev *idev)
{
+ obj_cnt_track_by_dev(idev, idev->dev, OBJ_CNT_IN6_DEV_PUT);
if (refcount_dec_and_test(&idev->refcnt))
in6_dev_finish_destroy(idev);
}
@@ -390,11 +393,13 @@ static inline void in6_dev_put_clear(struct inet6_dev **pidev)
static inline void __in6_dev_put(struct inet6_dev *idev)
{
+ obj_cnt_track_by_dev(idev, idev->dev, OBJ_CNT_IN6_DEV_PUT);
refcount_dec(&idev->refcnt);
}
static inline void in6_dev_hold(struct inet6_dev *idev)
{
+ obj_cnt_track_by_dev(idev, idev->dev, OBJ_CNT_IN6_DEV_HOLD);
refcount_inc(&idev->refcnt);
}
diff --git a/lib/obj_cnt.c b/lib/obj_cnt.c
index 648adc135080..8756efc005ed 100644
--- a/lib/obj_cnt.c
+++ b/lib/obj_cnt.c
@@ -18,7 +18,9 @@ static char *obj_cnt_str[OBJ_CNT_TYPE_MAX] = {
"dev_hold",
"dev_put",
"dst_hold",
- "dst_put"
+ "dst_put",
+ "in6_dev_hold",
+ "in6_dev_put"
};
struct obj_cnt {
--
2.27.0
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