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Message-Id: <20211205042217.982127-1-eric.dumazet@gmail.com>
Date: Sat, 4 Dec 2021 20:21:54 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: netdev <netdev@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>,
Eric Dumazet <eric.dumazet@...il.com>,
Dmitry Vyukov <dvyukov@...gle.com>
Subject: [PATCH v3 net-next 00/23] net: add preliminary netdev refcount tracking
From: Eric Dumazet <edumazet@...gle.com>
Two first patches add a generic infrastructure, that will be used
to get tracking of refcount increments/decrements.
The general idea is to be able to precisely pair each decrement with
a corresponding prior increment. Both share a cookie, basically
a pointer to private data storing stack traces.
The third patch adds dev_hold_track() and dev_put_track() helpers
(CONFIG_NET_DEV_REFCNT_TRACKER)
Then a series of 20 patches converts some dev_hold()/dev_put()
pairs to new hepers : dev_hold_track() and dev_put_track().
Hopefully this will be used by developpers and syzbot to
root cause bugs that cause netdevice dismantles freezes.
With CONFIG_PCPU_DEV_REFCNT=n option, we were able to detect
some class of bugs, but too late (when too many dev_put()
were happening).
Another series will be sent after this one is merged.
v3: moved NET_DEV_REFCNT_TRACKER to net/Kconfig.debug
added "depends on DEBUG_KERNEL && STACKTRACE_SUPPORT"
to hopefully get rid of kbuild reports for ARCH=nios2
Reworded patch 3 changelog.
Added missing htmldocs (Jakub)
v2: added four additional patches,
added netdev_tracker_alloc() and netdev_tracker_free()
addressed build error (kernel bots),
use GFP_ATOMIC in test_ref_tracker_timer_func()
Eric Dumazet (23):
lib: add reference counting tracking infrastructure
lib: add tests for reference tracker
net: add net device refcount tracker infrastructure
net: add net device refcount tracker to struct netdev_rx_queue
net: add net device refcount tracker to struct netdev_queue
net: add net device refcount tracker to ethtool_phys_id()
net: add net device refcount tracker to dev_ifsioc()
drop_monitor: add net device refcount tracker
net: dst: add net device refcount tracking to dst_entry
ipv6: add net device refcount tracker to rt6_probe_deferred()
sit: add net device refcount tracking to ip_tunnel
ipv6: add net device refcount tracker to struct ip6_tnl
net: add net device refcount tracker to struct neighbour
net: add net device refcount tracker to struct pneigh_entry
net: add net device refcount tracker to struct neigh_parms
net: add net device refcount tracker to struct netdev_adjacent
ipv6: add net device refcount tracker to struct inet6_dev
ipv4: add net device refcount tracker to struct in_device
net/sched: add net device refcount tracker to struct Qdisc
net: linkwatch: add net device refcount tracker
net: failover: add net device refcount tracker
ipmr, ip6mr: add net device refcount tracker to struct vif_device
netpoll: add net device refcount tracker to struct netpoll
drivers/net/netconsole.c | 2 +-
include/linux/inetdevice.h | 2 +
include/linux/mroute_base.h | 2 +
include/linux/netdevice.h | 68 ++++++++++++++++++
include/linux/netpoll.h | 1 +
include/linux/ref_tracker.h | 73 +++++++++++++++++++
include/net/devlink.h | 4 ++
include/net/dst.h | 1 +
include/net/failover.h | 1 +
include/net/if_inet6.h | 1 +
include/net/ip6_tunnel.h | 1 +
include/net/ip_tunnels.h | 3 +
include/net/neighbour.h | 3 +
include/net/sch_generic.h | 2 +-
lib/Kconfig | 5 ++
lib/Kconfig.debug | 15 ++++
lib/Makefile | 4 +-
lib/ref_tracker.c | 140 ++++++++++++++++++++++++++++++++++++
lib/test_ref_tracker.c | 115 +++++++++++++++++++++++++++++
net/Kconfig.debug | 11 +++
net/core/dev.c | 10 ++-
net/core/dev_ioctl.c | 5 +-
net/core/drop_monitor.c | 6 +-
net/core/dst.c | 8 +--
net/core/failover.c | 4 +-
net/core/link_watch.c | 4 +-
net/core/neighbour.c | 18 ++---
net/core/net-sysfs.c | 8 +--
net/core/netpoll.c | 4 +-
net/ethtool/ioctl.c | 5 +-
net/ipv4/devinet.c | 4 +-
net/ipv4/ipmr.c | 3 +-
net/ipv4/route.c | 7 +-
net/ipv6/addrconf.c | 4 +-
net/ipv6/addrconf_core.c | 2 +-
net/ipv6/ip6_gre.c | 8 +--
net/ipv6/ip6_tunnel.c | 4 +-
net/ipv6/ip6_vti.c | 4 +-
net/ipv6/ip6mr.c | 3 +-
net/ipv6/route.c | 10 +--
net/ipv6/sit.c | 4 +-
net/sched/sch_generic.c | 4 +-
42 files changed, 521 insertions(+), 62 deletions(-)
create mode 100644 include/linux/ref_tracker.h
create mode 100644 lib/ref_tracker.c
create mode 100644 lib/test_ref_tracker.c
create mode 100644 net/Kconfig.debug
--
2.34.1.400.ga245620fadb-goog
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