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Comments, mostly to remind myself of what's going on and why.

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This commit is contained in:
Adrian Chadd 2015-09-28 00:51:24 +00:00
parent d7621b8c80
commit f9128a1be3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=288317
1 changed files with 21 additions and 0 deletions
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21
sys/net80211/ieee80211_output.c
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@ -213,6 +213,22 @@ ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m,
}
}
/*
* XXX If we aren't doing AMPDU TX then we /could/ do
* fast-frames encapsulation, however right now this
* output logic doesn't handle that case.
*
* So we'll be limited to "fast-frames" xmit for non-11n STA
* and "no fast frames" xmit for 11n STAs.
* It'd be nice to eventually test fast-frames out by
* gracefully falling from failing A-MPDU transmission
* (driver says no, fail to negotiate it with peer) to
* using fast-frames.
*
* Note: we can actually put A-MSDU's inside an A-MPDU,
* so hopefully we can figure out how to make that particular
* combination work right.
*/
#ifdef IEEE80211_SUPPORT_SUPERG
else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) {
m = ieee80211_ff_check(ni, m);
@ -230,6 +246,11 @@ ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m,
*/
IEEE80211_TX_LOCK(ic);
/*
* XXX make the encap and transmit code a separate function
* so things like the FF (and later A-MSDU) path can just call
* it for flushed frames.
*/
if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
/*
* Encapsulate the packet in prep for transmission.