1c7b0c8456
A-MSDU is another 11n aggregation mechanism where multiple ethernet frames get LLC encapsulated (so they have a length field), padded, and put in a single MPDU (802.11 MAC frame.) This means it gets sent out as a single frame, with a single seqno, it's acked as one frame, etc. It turns out that, hah, atheros fast frames is almost but not quite like this, so I'm reusing all of the current superg/fast-frames stuff in order to actually transmit A-MSDU. Yes, this means that A-MSDU frames are also only aggregated two at a time, so it's not necessarily a huge win, but it's better than nothing. This doesn't do anything by default - the driver needs to say it does A-MSDU as well as set the AMSDU software TX capability so this code path gets exercised. For now, the only driver that enables this is urtwn. I'll enable it for rsu at some point soon. Tested: * Add an amsdu encap path to aggregate two frames, same as the fast-frames path. * Always do the superg init/teardown and node init/teardown stuff, regardless of whether the nodes are doing fast-frames (the ATH capability stuff.) That way we can reuse it for amsdu. * Don't do AMSDU for multicast/broadcast and EAPOL frames. * If we're doing A-MPDU, then don't bother doing FF/A-MSDU. We can likely do both together, but I don't want to change behaviour. * Teach the fast frames approx txtime logic to support the 11n rates. But, since we don't currently have a full "current rate" support, assume it's HT20, long-gi, etc. That way we overshoot on the TX time estimation, so we're always inside the requirements. (And we only aggregate two frames for now, so we're not really going to exceed that.) * Drop the maximum FF age default down to 2ms, otherwise we end up with some very annoyingly large latencies. TODO: * We only aggregate two ethernet frames, so I'm not checking the max A-MSDU size. But when it comes time to support >2 frames, we should obey that. Tested: * urtwn(4)
160 lines
5.5 KiB
C
160 lines
5.5 KiB
C
/*-
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* Copyright (c) 2009 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NET80211_IEEE80211_SUPERG_H_
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#define _NET80211_IEEE80211_SUPERG_H_
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/*
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* Atheros' 802.11 SuperG protocol support.
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*/
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/*
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* Atheros advanced capability information element.
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*/
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struct ieee80211_ath_ie {
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uint8_t ath_id; /* IEEE80211_ELEMID_VENDOR */
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uint8_t ath_len; /* length in bytes */
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uint8_t ath_oui[3]; /* ATH_OUI */
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uint8_t ath_oui_type; /* ATH_OUI_TYPE */
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uint8_t ath_oui_subtype; /* ATH_OUI_SUBTYPE */
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uint8_t ath_version; /* spec revision */
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uint8_t ath_capability; /* capability info */
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#define ATHEROS_CAP_TURBO_PRIME 0x01 /* dynamic turbo--aka Turbo' */
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#define ATHEROS_CAP_COMPRESSION 0x02 /* data compression */
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#define ATHEROS_CAP_FAST_FRAME 0x04 /* fast (jumbo) frames */
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#define ATHEROS_CAP_XR 0x08 /* Xtended Range support */
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#define ATHEROS_CAP_AR 0x10 /* Advanded Radar support */
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#define ATHEROS_CAP_BURST 0x20 /* Bursting - not negotiated */
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#define ATHEROS_CAP_WME 0x40 /* CWMin tuning */
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#define ATHEROS_CAP_BOOST 0x80 /* use turbo/!turbo mode */
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uint8_t ath_defkeyix[2];
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} __packed;
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#define ATH_OUI_VERSION 0x00
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#define ATH_OUI_SUBTYPE 0x01
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#ifdef _KERNEL
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struct ieee80211_stageq {
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struct mbuf *head; /* frames linked w/ m_nextpkt */
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struct mbuf *tail; /* last frame in queue */
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int depth; /* # items on head */
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};
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struct ieee80211_superg {
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/* fast-frames staging q */
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struct ieee80211_stageq ff_stageq[WME_NUM_AC];
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};
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void ieee80211_superg_attach(struct ieee80211com *);
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void ieee80211_superg_detach(struct ieee80211com *);
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void ieee80211_superg_vattach(struct ieee80211vap *);
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void ieee80211_superg_vdetach(struct ieee80211vap *);
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uint8_t *ieee80211_add_ath(uint8_t *, uint8_t, ieee80211_keyix);
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uint8_t *ieee80211_add_athcaps(uint8_t *, const struct ieee80211_node *);
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void ieee80211_parse_ath(struct ieee80211_node *, uint8_t *);
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int ieee80211_parse_athparams(struct ieee80211_node *, uint8_t *,
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const struct ieee80211_frame *);
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void ieee80211_ff_node_init(struct ieee80211_node *);
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void ieee80211_ff_node_cleanup(struct ieee80211_node *);
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static inline int
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ieee80211_amsdu_tx_ok(struct ieee80211_node *ni)
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{
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/* First: software A-MSDU transmit? */
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if ((ni->ni_ic->ic_caps & IEEE80211_C_SWAMSDUTX) == 0)
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return (0);
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/* Next: does the VAP have AMSDU TX enabled? */
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if ((ni->ni_vap->iv_flags_ht & IEEE80211_FHT_AMSDU_TX) == 0)
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return (0);
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/* Next: 11n node? (assumed that A-MSDU TX to HT nodes is ok */
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if ((ni->ni_flags & IEEE80211_NODE_HT) == 0)
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return (0);
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/* ok, we can at least /do/ AMSDU to this node */
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return (1);
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}
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struct mbuf * ieee80211_amsdu_check(struct ieee80211_node *ni, struct mbuf *m);
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struct mbuf *ieee80211_ff_check(struct ieee80211_node *, struct mbuf *);
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void ieee80211_ff_age(struct ieee80211com *, struct ieee80211_stageq *,
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int quanta);
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/*
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* See ieee80211_ff_age() for a description of the locking
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* expectation here.
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*/
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static __inline void
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ieee80211_ff_flush(struct ieee80211com *ic, int ac)
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{
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struct ieee80211_superg *sg = ic->ic_superg;
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if (sg != NULL && sg->ff_stageq[ac].depth)
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ieee80211_ff_age(ic, &sg->ff_stageq[ac], 0x7fffffff);
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}
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/*
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* See ieee80211_ff_age() for a description of the locking
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* expectation here.
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*/
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static __inline void
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ieee80211_ff_age_all(struct ieee80211com *ic, int quanta)
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{
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struct ieee80211_superg *sg = ic->ic_superg;
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if (sg != NULL) {
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if (sg->ff_stageq[WME_AC_VO].depth)
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ieee80211_ff_age(ic, &sg->ff_stageq[WME_AC_VO], quanta);
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if (sg->ff_stageq[WME_AC_VI].depth)
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ieee80211_ff_age(ic, &sg->ff_stageq[WME_AC_VI], quanta);
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if (sg->ff_stageq[WME_AC_BE].depth)
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ieee80211_ff_age(ic, &sg->ff_stageq[WME_AC_BE], quanta);
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if (sg->ff_stageq[WME_AC_BK].depth)
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ieee80211_ff_age(ic, &sg->ff_stageq[WME_AC_BK], quanta);
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}
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}
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struct mbuf *ieee80211_ff_encap(struct ieee80211vap *, struct mbuf *,
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int, struct ieee80211_key *);
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struct mbuf * ieee80211_amsdu_encap(struct ieee80211vap *vap, struct mbuf *m1,
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int hdrspace, struct ieee80211_key *key);
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struct mbuf *ieee80211_ff_decap(struct ieee80211_node *, struct mbuf *);
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static __inline struct mbuf *
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ieee80211_decap_fastframe(struct ieee80211vap *vap, struct ieee80211_node *ni,
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struct mbuf *m)
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{
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return IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
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ieee80211_ff_decap(ni, m) : m;
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}
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#endif /* _KERNEL */
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#endif /* _NET80211_IEEE80211_SUPERG_H_ */
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