This change intends to run the whole network stack in softint context
(or normal LWP), not hardware interrupt context. Note that the work is
still incomplete by this change; to that end, we also have to softint-ify
if_link_state_change (and bpf) which can still run in hardware interrupt.
This change softint-ifies at ifp->if_input that is called from
each device driver (and ieee80211_input) to ensure Layer 2 runs
in softint (e.g., ether_input and bridge_input). To this end,
we provide a framework (called percpuq) that utlizes softint(9)
and percpu ifqueues. With this patch, rxintr of most drivers just
queues received packets and schedules a softint, and the softint
dequeues packets and does rest packet processing.
To minimize changes to each driver, percpuq is allocated in struct
ifnet for now and that is initialized by default (in if_attach).
We probably have to move percpuq to softc of each driver, but it's
future work. At this point, only wm(4) has percpuq in its softc
as a reference implementation.
Additional information including performance numbers can be found
in the thread at tech-kern@ and tech-net@:
http://mail-index.netbsd.org/tech-kern/2016/01/14/msg019997.html
Acknowledgment: riastradh@ greatly helped this work.
Thank you very much!
This code path can be hit if the firmware failed to load, for instance
if the file is not present on the filesystem. In this case
firmware_open() fails, and fw->fw_rawdata never gets allocated in the
first place.
to -1. The result of this is tx frames were always sent out at fixed
rate 0 instead of ni_txrate.
Match the iwn behaviour and test ic_fixed_rate for -1 instead.
From OpenBSD rev.1.29.
nrates > __arraycount(lq->rs_table), coverity erroneously binds nrates
to the range [0..16), whereas it is really bound to [0..15) by
ni->ni_rates.rs_nrates (IEEE80211_RATE_MAXSIZE). We add an explicit comparison
to unconfuse it that will always succeed.
Supported devices should more or less match ones supported
by the Linux iwlwifi mvm driver. Sponsored by genua mbh for OpenBSD.
This is probably the world's first Canadian cross device driver: it was
created for OpenBSD by writing and porting a NetBSD driver which was
developed in a rump kernel in Linux userspace.
Note: I don't have access to the hardware anymore, so this version is
not tested and not enabled by default. While I tried to be careful in
adding the NetBSD bits back, it's probable that there's a snafu or two.
Feel free to send private email in case you have the hardware and there
are issues.
ozaki-r