CVS commit: src/sys/net

["Ryota Ozaki" <ozaki-r%netbsd.org@localhost>]

Module Name:    src
Committed By:   ozaki-r
Date:           Thu Feb  9 09:30:26 UTC 2017

Modified Files:
        src/sys/net: bpf.c bpfdesc.h if.c

Log Message:
Make bpf MP-safe

By the change, bpf_mtap can run without any locks as long as its bpf filter
doesn't match a target packet. Pushing data to a bpf buffer still needs
a lock. Removing the lock requires big changes and it's a future work.

Another known issue is that we need to remain some obsolete variables to
avoid breaking kvm(3) users such as netstat and fstat. One problem for
MP-ification is that in order to keep statistic counters of bpf_d we need
to use atomic operations for them. Once we retire the kvm(3) users, we
should make the counters per-CPU and remove the atomic operations.


To generate a diff of this commit:
cvs rdiff -u -r1.212 -r1.213 src/sys/net/bpf.c
cvs rdiff -u -r1.43 -r1.44 src/sys/net/bpfdesc.h
cvs rdiff -u -r1.375 -r1.376 src/sys/net/if.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.