K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2020-10-06T19:19:56.272263Z
K 7
svn:log
V 607
bridge: call member interface ioctl() without NET_EPOCH

We're not allowed to hold NET_EPOCH while sleeping, so when we call ioctl()
handlers for member interfaces we cannot be in NET_EPOCH.  We still need some
protection of our CK_LISTs, so hold BRIDGE_LOCK instead.

That requires changing BRIDGE_LOCK into a sleepable lock, and separating the
BRIDGE_RT_LOCK, to protect bridge_rtnode lists. That lock is taken in the data
path (while in NET_EPOCH), so it cannot be a sleepable lock.

While here document the locking strategy.

MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D26418

END