fe6d427551
Having a pointer of an interface in a mbuf isn't safe if we remove big
kernel locks; an interface object (ifnet) can be destroyed anytime in any
packet processing and accessing such object via a pointer is racy. Instead
we have to get an object from the interface collection (ifindex2ifnet) via
an interface index (if_index) that is stored to a mbuf instead of an
pointer.
The change provides two APIs: m_{get,put}_rcvif_psref that use psref(9)
for sleep-able critical sections and m_{get,put}_rcvif that use
pserialize(9) for other critical sections. The change also adds another
API called m_get_rcvif_NOMPSAFE, that is NOT MP-safe and for transition
moratorium, i.e., it is intended to be used for places where are not
planned to be MP-ified soon.
The change adds some overhead due to psref to performance sensitive paths,
however the overhead is not serious, 2% down at worst.
Proposed on tech-kern and tech-net.
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|---|---|---|
| .. | ||
| altq_afmap.c | ||
| altq_afmap.h | ||
| altq_blue.c | ||
| altq_blue.h | ||
| altq_cbq.c | ||
| altq_cbq.h | ||
| altq_cdnr.c | ||
| altq_cdnr.h | ||
| altq_classq.h | ||
| altq_conf.c | ||
| altq_conf.h | ||
| altq_fifoq.c | ||
| altq_fifoq.h | ||
| altq_flowvalve.h | ||
| altq_hfsc.c | ||
| altq_hfsc.h | ||
| altq_jobs.c | ||
| altq_jobs.h | ||
| altq_localq.c | ||
| altq_priq.c | ||
| altq_priq.h | ||
| altq_red.c | ||
| altq_red.h | ||
| altq_rio.c | ||
| altq_rio.h | ||
| altq_rmclass_debug.h | ||
| altq_rmclass.c | ||
| altq_rmclass.h | ||
| altq_subr.c | ||
| altq_var.h | ||
| altq_wfq.c | ||
| altq_wfq.h | ||
| altq.h | ||
| altqconf.h | ||
| files.altq | ||
| if_altq.h | ||
| Makefile | ||