This is hopefully a big no-op unless you're running some extra patches to flip on A-MSDU options in a driver. 802.11n supports sending A-MSDU in A-MPDU. That lets you do things like pack small frames into an A-MSDU and stuff /those/ into an A-MPDU. It allows for much more efficient airtime because you're not wasting time sending small frames - which is still a problem when doing A-MPDU as there's still per-frame overhead and minimum A-MPDU density requirements. It, however, is optional for 802.11n. A lot of stuff doesn't advertise it (but does it, just wait!); and I know that ath10k does it and my ath(4) driver work supports it. Now, 802.11ac makes A-MSDU in A-MPDU something that can happen more frequently, because even though you can send very large A-MPDUs (like 1 megabyte and larger) you still have the small frame problem. So, 802.11ac NICs like ath10k and iwm will support A-MSDU in A-MPDU out of the box if it's enabled - and you can negotiate it. So, let's lay down the ground work to enable A-MSDU in A-MPDU. This will allow hardware like iwn(4) and ath(4) which supports software A-MSDU but hardware A-MPDU to be more efficient. Drivers that support A-MSDU in A-MPDU will set TX/RX htcap flags. Note this is separate from the software A-MSDU encap path; /that/ dictates whether net80211 is doing A-MSDU encapsulation or not. These HTC flags control negotiation, NOT encapsulation. Once this negotiation and driver bits are done, hardware like rtwn(4), run(4), and others will be able to use A-MSDU even without A-MPDU working; right now FF and A-MSDU aren't even attempted if you're an 11n node. It's a small hold-over from the initial A-MPDU work and I know how to fix it, but to flip it on properly I need to be able to negotiate or ignore A-MSDU in A-MPDU. Oh and the fun part - some 11ac APs I've tested will quite happily decap A-MSDU in A-MPDU even though they don't negotiate it when doing 802.11n. So hey, I know it works - I just want to properly handle things. :-) Tested: * AR9380, STA/AP mode |
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bin | ||
cddl | ||
contrib | ||
crypto | ||
etc | ||
gnu | ||
include | ||
kerberos5 | ||
lib | ||
libexec | ||
release | ||
rescue | ||
sbin | ||
secure | ||
share | ||
stand | ||
sys | ||
targets | ||
tests | ||
tools | ||
usr.bin | ||
usr.sbin | ||
.arcconfig | ||
.arclint | ||
.cirrus.yml | ||
.clang-format | ||
.gitattributes | ||
.gitignore | ||
COPYRIGHT | ||
LOCKS | ||
MAINTAINERS | ||
Makefile | ||
Makefile.inc1 | ||
Makefile.libcompat | ||
Makefile.sys.inc | ||
ObsoleteFiles.inc | ||
README | ||
README.md | ||
RELNOTES | ||
UPDATING |
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