diff options
Diffstat (limited to 'freebsd/sys/net80211/ieee80211_superg.c')
| -rw-r--r-- | freebsd/sys/net80211/ieee80211_superg.c | 902 |
1 files changed, 902 insertions, 0 deletions
diff --git a/freebsd/sys/net80211/ieee80211_superg.c b/freebsd/sys/net80211/ieee80211_superg.c new file mode 100644 index 00000000..dd886e41 --- /dev/null +++ b/freebsd/sys/net80211/ieee80211_superg.c @@ -0,0 +1,902 @@ +#include <freebsd/machine/rtems-bsd-config.h> + +/*- + * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <freebsd/sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <freebsd/local/opt_wlan.h> + +#include <freebsd/sys/param.h> +#include <freebsd/sys/systm.h> +#include <freebsd/sys/mbuf.h> +#include <freebsd/sys/kernel.h> +#include <freebsd/sys/endian.h> + +#include <freebsd/sys/socket.h> + +#include <freebsd/net/bpf.h> +#include <freebsd/net/ethernet.h> +#include <freebsd/net/if.h> +#include <freebsd/net/if_llc.h> +#include <freebsd/net/if_media.h> + +#include <freebsd/net80211/ieee80211_var.h> +#include <freebsd/net80211/ieee80211_input.h> +#include <freebsd/net80211/ieee80211_phy.h> +#include <freebsd/net80211/ieee80211_superg.h> + +/* + * Atheros fast-frame encapsulation format. + * FF max payload: + * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500: + * 8 + 4 + 4 + 14 + 8 + 1500 + 6 + 14 + 8 + 1500 + * = 3066 + */ +/* fast frame header is 32-bits */ +#define ATH_FF_PROTO 0x0000003f /* protocol */ +#define ATH_FF_PROTO_S 0 +#define ATH_FF_FTYPE 0x000000c0 /* frame type */ +#define ATH_FF_FTYPE_S 6 +#define ATH_FF_HLEN32 0x00000300 /* optional hdr length */ +#define ATH_FF_HLEN32_S 8 +#define ATH_FF_SEQNUM 0x001ffc00 /* sequence number */ +#define ATH_FF_SEQNUM_S 10 +#define ATH_FF_OFFSET 0xffe00000 /* offset to 2nd payload */ +#define ATH_FF_OFFSET_S 21 + +#define ATH_FF_MAX_HDR_PAD 4 +#define ATH_FF_MAX_SEP_PAD 6 +#define ATH_FF_MAX_HDR 30 + +#define ATH_FF_PROTO_L2TUNNEL 0 /* L2 tunnel protocol */ +#define ATH_FF_ETH_TYPE 0x88bd /* Ether type for encapsulated frames */ +#define ATH_FF_SNAP_ORGCODE_0 0x00 +#define ATH_FF_SNAP_ORGCODE_1 0x03 +#define ATH_FF_SNAP_ORGCODE_2 0x7f + +#define ATH_FF_TXQMIN 2 /* min txq depth for staging */ +#define ATH_FF_TXQMAX 50 /* maximum # of queued frames allowed */ +#define ATH_FF_STAGEMAX 5 /* max waiting period for staged frame*/ + +#define ETHER_HEADER_COPY(dst, src) \ + memcpy(dst, src, sizeof(struct ether_header)) + +static int ieee80211_ffppsmin = 2; /* pps threshold for ff aggregation */ +SYSCTL_INT(_net_wlan, OID_AUTO, ffppsmin, CTLTYPE_INT | CTLFLAG_RW, + &ieee80211_ffppsmin, 0, "min packet rate before fast-frame staging"); +static int ieee80211_ffagemax = -1; /* max time frames held on stage q */ +SYSCTL_PROC(_net_wlan, OID_AUTO, ffagemax, CTLTYPE_INT | CTLFLAG_RW, + &ieee80211_ffagemax, 0, ieee80211_sysctl_msecs_ticks, "I", + "max hold time for fast-frame staging (ms)"); + +void +ieee80211_superg_attach(struct ieee80211com *ic) +{ + struct ieee80211_superg *sg; + + if (ic->ic_caps & IEEE80211_C_FF) { + sg = (struct ieee80211_superg *) malloc( + sizeof(struct ieee80211_superg), M_80211_VAP, + M_NOWAIT | M_ZERO); + if (sg == NULL) { + printf("%s: cannot allocate SuperG state block\n", + __func__); + return; + } + ic->ic_superg = sg; + } + ieee80211_ffagemax = msecs_to_ticks(150); +} + +void +ieee80211_superg_detach(struct ieee80211com *ic) +{ + if (ic->ic_superg != NULL) { + free(ic->ic_superg, M_80211_VAP); + ic->ic_superg = NULL; + } +} + +void +ieee80211_superg_vattach(struct ieee80211vap *vap) +{ + struct ieee80211com *ic = vap->iv_ic; + + if (ic->ic_superg == NULL) /* NB: can't do fast-frames w/o state */ + vap->iv_caps &= ~IEEE80211_C_FF; + if (vap->iv_caps & IEEE80211_C_FF) + vap->iv_flags |= IEEE80211_F_FF; + /* NB: we only implement sta mode */ + if (vap->iv_opmode == IEEE80211_M_STA && + (vap->iv_caps & IEEE80211_C_TURBOP)) + vap->iv_flags |= IEEE80211_F_TURBOP; +} + +void +ieee80211_superg_vdetach(struct ieee80211vap *vap) +{ +} + +#define ATH_OUI_BYTES 0x00, 0x03, 0x7f +/* + * Add a WME information element to a frame. + */ +uint8_t * +ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix) +{ + static const struct ieee80211_ath_ie info = { + .ath_id = IEEE80211_ELEMID_VENDOR, + .ath_len = sizeof(struct ieee80211_ath_ie) - 2, + .ath_oui = { ATH_OUI_BYTES }, + .ath_oui_type = ATH_OUI_TYPE, + .ath_oui_subtype= ATH_OUI_SUBTYPE, + .ath_version = ATH_OUI_VERSION, + }; + struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; + + memcpy(frm, &info, sizeof(info)); + ath->ath_capability = caps; + if (defkeyix != IEEE80211_KEYIX_NONE) { + ath->ath_defkeyix[0] = (defkeyix & 0xff); + ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); + } else { + ath->ath_defkeyix[0] = 0xff; + ath->ath_defkeyix[1] = 0x7f; + } + return frm + sizeof(info); +} +#undef ATH_OUI_BYTES + +uint8_t * +ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss) +{ + const struct ieee80211vap *vap = bss->ni_vap; + + return ieee80211_add_ath(frm, + vap->iv_flags & IEEE80211_F_ATHEROS, + ((vap->iv_flags & IEEE80211_F_WPA) == 0 && + bss->ni_authmode != IEEE80211_AUTH_8021X) ? + vap->iv_def_txkey : IEEE80211_KEYIX_NONE); +} + +void +ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie) +{ + const struct ieee80211_ath_ie *ath = + (const struct ieee80211_ath_ie *) ie; + + ni->ni_ath_flags = ath->ath_capability; + ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); +} + +int +ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, + const struct ieee80211_frame *wh) +{ + struct ieee80211vap *vap = ni->ni_vap; + const struct ieee80211_ath_ie *ath; + u_int len = frm[1]; + int capschanged; + uint16_t defkeyix; + + if (len < sizeof(struct ieee80211_ath_ie)-2) { + IEEE80211_DISCARD_IE(vap, + IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, + wh, "Atheros", "too short, len %u", len); + return -1; + } + ath = (const struct ieee80211_ath_ie *)frm; + capschanged = (ni->ni_ath_flags != ath->ath_capability); + defkeyix = LE_READ_2(ath->ath_defkeyix); + if (capschanged || defkeyix != ni->ni_ath_defkeyix) { + ni->ni_ath_flags = ath->ath_capability; + ni->ni_ath_defkeyix = defkeyix; + IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, + "ath ie change: new caps 0x%x defkeyix 0x%x", + ni->ni_ath_flags, ni->ni_ath_defkeyix); + } + if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) { + uint16_t curflags, newflags; + + /* + * Check for turbo mode switch. Calculate flags + * for the new mode and effect the switch. + */ + newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags; + /* NB: BOOST is not in ic_flags, so get it from the ie */ + if (ath->ath_capability & ATHEROS_CAP_BOOST) + newflags |= IEEE80211_CHAN_TURBO; + else + newflags &= ~IEEE80211_CHAN_TURBO; + if (newflags != curflags) + ieee80211_dturbo_switch(vap, newflags); + } + return capschanged; +} + +/* + * Decap the encapsulated frame pair and dispatch the first + * for delivery. The second frame is returned for delivery + * via the normal path. + */ +struct mbuf * +ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m) +{ +#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) +#define MS(x,f) (((x) & f) >> f##_S) + struct ieee80211vap *vap = ni->ni_vap; + struct llc *llc; + uint32_t ath; + struct mbuf *n; + int framelen; + + /* NB: we assume caller does this check for us */ + KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF), + ("ff not negotiated")); + /* + * Check for fast-frame tunnel encapsulation. + */ + if (m->m_pkthdr.len < 3*FF_LLC_SIZE) + return m; + if (m->m_len < FF_LLC_SIZE && + (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { + IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, + ni->ni_macaddr, "fast-frame", + "%s", "m_pullup(llc) failed"); + vap->iv_stats.is_rx_tooshort++; + return NULL; + } + llc = (struct llc *)(mtod(m, uint8_t *) + + sizeof(struct ether_header)); + if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE)) + return m; + m_adj(m, FF_LLC_SIZE); + m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); + if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { + IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, + ni->ni_macaddr, "fast-frame", + "unsupport tunnel protocol, header 0x%x", ath); + vap->iv_stats.is_ff_badhdr++; + m_freem(m); + return NULL; + } + /* NB: skip header and alignment padding */ + m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); + + vap->iv_stats.is_ff_decap++; + + /* + * Decap the first frame, bust it apart from the + * second and deliver; then decap the second frame + * and return it to the caller for normal delivery. + */ + m = ieee80211_decap1(m, &framelen); + if (m == NULL) { + IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, + ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); + vap->iv_stats.is_ff_tooshort++; + return NULL; + } + n = m_split(m, framelen, M_NOWAIT); + if (n == NULL) { + IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, + ni->ni_macaddr, "fast-frame", + "%s", "unable to split encapsulated frames"); + vap->iv_stats.is_ff_split++; + m_freem(m); /* NB: must reclaim */ + return NULL; + } + /* XXX not right for WDS */ + vap->iv_deliver_data(vap, ni, m); /* 1st of pair */ + + /* + * Decap second frame. + */ + m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ + n = ieee80211_decap1(n, &framelen); + if (n == NULL) { + IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, + ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); + vap->iv_stats.is_ff_tooshort++; + } + /* XXX verify framelen against mbuf contents */ + return n; /* 2nd delivered by caller */ +#undef MS +#undef FF_LLC_SIZE +} + +/* + * Do Ethernet-LLC encapsulation for each payload in a fast frame + * tunnel encapsulation. The frame is assumed to have an Ethernet + * header at the front that must be stripped before prepending the + * LLC followed by the Ethernet header passed in (with an Ethernet + * type that specifies the payload size). + */ +static struct mbuf * +ff_encap1(struct ieee80211vap *vap, struct mbuf *m, + const struct ether_header *eh) +{ + struct llc *llc; + uint16_t payload; + + /* XXX optimize by combining m_adj+M_PREPEND */ + m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); + llc = mtod(m, struct llc *); + llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; + llc->llc_control = LLC_UI; + llc->llc_snap.org_code[0] = 0; + llc->llc_snap.org_code[1] = 0; + llc->llc_snap.org_code[2] = 0; + llc->llc_snap.ether_type = eh->ether_type; + payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ + + M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); + if (m == NULL) { /* XXX cannot happen */ + IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, + "%s: no space for ether_header\n", __func__); + vap->iv_stats.is_tx_nobuf++; + return NULL; + } + ETHER_HEADER_COPY(mtod(m, void *), eh); + mtod(m, struct ether_header *)->ether_type = htons(payload); + return m; +} + +/* + * Fast frame encapsulation. There must be two packets + * chained with m_nextpkt. We do header adjustment for + * each, add the tunnel encapsulation, and then concatenate + * the mbuf chains to form a single frame for transmission. + */ +struct mbuf * +ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace, + struct ieee80211_key *key) +{ + struct mbuf *m2; + struct ether_header eh1, eh2; + struct llc *llc; + struct mbuf *m; + int pad; + + m2 = m1->m_nextpkt; + if (m2 == NULL) { + IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, + "%s: only one frame\n", __func__); + goto bad; + } + m1->m_nextpkt = NULL; + /* + * Include fast frame headers in adjusting header layout. + */ + KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!")); + ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t)); + m1 = ieee80211_mbuf_adjust(vap, + hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + + sizeof(struct ether_header), + key, m1); + if (m1 == NULL) { + /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ + m_freem(m2); + goto bad; + } + + /* + * Copy second frame's Ethernet header out of line + * and adjust for encapsulation headers. Note that + * we make room for padding in case there isn't room + * at the end of first frame. + */ + KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); + ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); + m2 = ieee80211_mbuf_adjust(vap, + ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), + NULL, m2); + if (m2 == NULL) { + /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ + goto bad; + } + + /* + * Now do tunnel encapsulation. First, each + * frame gets a standard encapsulation. + */ + m1 = ff_encap1(vap, m1, &eh1); + if (m1 == NULL) + goto bad; + m2 = ff_encap1(vap, m2, &eh2); + if (m2 == NULL) + goto bad; + + /* + * Pad leading frame to a 4-byte boundary. If there + * is space at the end of the first frame, put it + * there; otherwise prepend to the front of the second + * frame. We know doing the second will always work + * because we reserve space above. We prefer appending + * as this typically has better DMA alignment properties. + */ + for (m = m1; m->m_next != NULL; m = m->m_next) + ; + pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; + if (pad) { + if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ + m2->m_data -= pad; + m2->m_len += pad; + m2->m_pkthdr.len += pad; + } else { /* append to first */ + m->m_len += pad; + m1->m_pkthdr.len += pad; + } + } + + /* + * Now, stick 'em together and prepend the tunnel headers; + * first the Atheros tunnel header (all zero for now) and + * then a special fast frame LLC. + * + * XXX optimize by prepending together + */ + m->m_next = m2; /* NB: last mbuf from above */ + m1->m_pkthdr.len += m2->m_pkthdr.len; + M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); + if (m1 == NULL) { /* XXX cannot happen */ + IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, + "%s: no space for tunnel header\n", __func__); + vap->iv_stats.is_tx_nobuf++; + return NULL; + } + memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); + + M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); + if (m1 == NULL) { /* XXX cannot happen */ + IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, + "%s: no space for llc header\n", __func__); + vap->iv_stats.is_tx_nobuf++; + return NULL; + } + llc = mtod(m1, struct llc *); + llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; + llc->llc_control = LLC_UI; + llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; + llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; + llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; + llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); + + vap->iv_stats.is_ff_encap++; + + return m1; +bad: + if (m1 != NULL) + m_freem(m1); + if (m2 != NULL) + m_freem(m2); + return NULL; +} + +static void +ff_transmit(struct ieee80211_node *ni, struct mbuf *m) +{ + struct ieee80211vap *vap = ni->ni_vap; + int error; + + /* encap and xmit */ + m = ieee80211_encap(vap, ni, m); + if (m != NULL) { + struct ifnet *ifp = vap->iv_ifp; + struct ifnet *parent = ni->ni_ic->ic_ifp; + + error = parent->if_transmit(parent, m); + if (error != 0) { + /* NB: IFQ_HANDOFF reclaims mbuf */ + ieee80211_free_node(ni); + } else { + ifp->if_opackets++; + } + } else + ieee80211_free_node(ni); +} + +/* + * Flush frames to device; note we re-use the linked list + * the frames were stored on and use the sentinel (unchanged) + * which may be non-NULL. + */ +static void +ff_flush(struct mbuf *head, struct mbuf *last) +{ + struct mbuf *m, *next; + struct ieee80211_node *ni; + struct ieee80211vap *vap; + + for (m = head; m != last; m = next) { + next = m->m_nextpkt; + m->m_nextpkt = NULL; + + ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; + vap = ni->ni_vap; + + IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, + "%s: flush frame, age %u", __func__, M_AGE_GET(m)); + vap->iv_stats.is_ff_flush++; + + ff_transmit(ni, m); + } +} + +/* + * Age frames on the staging queue. + */ +void +ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq, + int quanta) +{ + struct ieee80211_superg *sg = ic->ic_superg; + struct mbuf *m, *head; + struct ieee80211_node *ni; + struct ieee80211_tx_ampdu *tap; + + KASSERT(sq->head != NULL, ("stageq empty")); + + IEEE80211_LOCK(ic); + head = sq->head; + while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) { + /* clear tap ref to frame */ + ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; + tap = &ni->ni_tx_ampdu[M_WME_GETAC(m)]; + KASSERT(tap->txa_private == m, ("staging queue empty")); + tap->txa_private = NULL; + + sq->head = m->m_nextpkt; + sq->depth--; + sg->ff_stageqdepth--; + } + if (m == NULL) + sq->tail = NULL; + else + M_AGE_SUB(m, quanta); + IEEE80211_UNLOCK(ic); + + ff_flush(head, m); +} + +static void +stageq_add(struct ieee80211_stageq *sq, struct mbuf *m) +{ + int age = ieee80211_ffagemax; + if (sq->tail != NULL) { + sq->tail->m_nextpkt = m; + age -= M_AGE_GET(sq->head); + } else + sq->head = m; + KASSERT(age >= 0, ("age %d", age)); + M_AGE_SET(m, age); + m->m_nextpkt = NULL; + sq->tail = m; + sq->depth++; +} + +static void +stageq_remove(struct ieee80211_stageq *sq, struct mbuf *mstaged) +{ + struct mbuf *m, *mprev; + + mprev = NULL; + for (m = sq->head; m != NULL; m = m->m_nextpkt) { + if (m == mstaged) { + if (mprev == NULL) + sq->head = m->m_nextpkt; + else + mprev->m_nextpkt = m->m_nextpkt; + if (sq->tail == m) + sq->tail = mprev; + sq->depth--; + return; + } + mprev = m; + } + printf("%s: packet not found\n", __func__); +} + +static uint32_t +ff_approx_txtime(struct ieee80211_node *ni, + const struct mbuf *m1, const struct mbuf *m2) +{ + struct ieee80211com *ic = ni->ni_ic; + struct ieee80211vap *vap = ni->ni_vap; + uint32_t framelen; + + /* + * Approximate the frame length to be transmitted. A swag to add + * the following maximal values to the skb payload: + * - 32: 802.11 encap + CRC + * - 24: encryption overhead (if wep bit) + * - 4 + 6: fast-frame header and padding + * - 16: 2 LLC FF tunnel headers + * - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd) + */ + framelen = m1->m_pkthdr.len + 32 + + ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR; + if (vap->iv_flags & IEEE80211_F_PRIVACY) + framelen += 24; + if (m2 != NULL) + framelen += m2->m_pkthdr.len; + return ieee80211_compute_duration(ic->ic_rt, framelen, ni->ni_txrate, 0); +} + +/* + * Check if the supplied frame can be partnered with an existing + * or pending frame. Return a reference to any frame that should be + * sent on return; otherwise return NULL. + */ +struct mbuf * +ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m) +{ + struct ieee80211vap *vap = ni->ni_vap; + struct ieee80211com *ic = ni->ni_ic; + struct ieee80211_superg *sg = ic->ic_superg; + const int pri = M_WME_GETAC(m); + struct ieee80211_stageq *sq; + struct ieee80211_tx_ampdu *tap; + struct mbuf *mstaged; + uint32_t txtime, limit; + + /* + * Check if the supplied frame can be aggregated. + * + * NB: we allow EAPOL frames to be aggregated with other ucast traffic. + * Do 802.1x EAPOL frames proceed in the clear? Then they couldn't + * be aggregated with other types of frames when encryption is on? + */ + IEEE80211_LOCK(ic); + tap = &ni->ni_tx_ampdu[pri]; + mstaged = tap->txa_private; /* NB: we reuse AMPDU state */ + ieee80211_txampdu_count_packet(tap); + + /* + * When not in station mode never aggregate a multicast + * frame; this insures, for example, that a combined frame + * does not require multiple encryption keys. + */ + if (vap->iv_opmode != IEEE80211_M_STA && + ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) { + /* XXX flush staged frame? */ + IEEE80211_UNLOCK(ic); + return m; + } + /* + * If there is no frame to combine with and the pps is + * too low; then do not attempt to aggregate this frame. + */ + if (mstaged == NULL && + ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) { + IEEE80211_UNLOCK(ic); + return m; + } + sq = &sg->ff_stageq[pri]; + /* + * Check the txop limit to insure the aggregate fits. + */ + limit = IEEE80211_TXOP_TO_US( + ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit); + if (limit != 0 && + (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) { + /* + * Aggregate too long, return to the caller for direct + * transmission. In addition, flush any pending frame + * before sending this one. + */ + IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, + "%s: txtime %u exceeds txop limit %u\n", + __func__, txtime, limit); + + tap->txa_private = NULL; + if (mstaged != NULL) + stageq_remove(sq, mstaged); + IEEE80211_UNLOCK(ic); + + if (mstaged != NULL) { + IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, + "%s: flush staged frame", __func__); + /* encap and xmit */ + ff_transmit(ni, mstaged); + } + return m; /* NB: original frame */ + } + /* + * An aggregation candidate. If there's a frame to partner + * with then combine and return for processing. Otherwise + * save this frame and wait for a partner to show up (or + * the frame to be flushed). Note that staged frames also + * hold their node reference. + */ + if (mstaged != NULL) { + tap->txa_private = NULL; + stageq_remove(sq, mstaged); + IEEE80211_UNLOCK(ic); + + IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, + "%s: aggregate fast-frame", __func__); + /* + * Release the node reference; we only need + * the one already in mstaged. + */ + KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni, + ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni)); + ieee80211_free_node(ni); + + m->m_nextpkt = NULL; + mstaged->m_nextpkt = m; + mstaged->m_flags |= M_FF; /* NB: mark for encap work */ + } else { + KASSERT(tap->txa_private == NULL, + ("txa_private %p", tap->txa_private)); + tap->txa_private = m; + + stageq_add(sq, m); + sg->ff_stageqdepth++; + IEEE80211_UNLOCK(ic); + + IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, + "%s: stage frame, %u queued", __func__, sq->depth); + /* NB: mstaged is NULL */ + } + return mstaged; +} + +void +ieee80211_ff_node_init(struct ieee80211_node *ni) +{ + /* + * Clean FF state on re-associate. This handles the case + * where a station leaves w/o notifying us and then returns + * before node is reaped for inactivity. + */ + ieee80211_ff_node_cleanup(ni); +} + +void +ieee80211_ff_node_cleanup(struct ieee80211_node *ni) +{ + struct ieee80211com *ic = ni->ni_ic; + struct ieee80211_superg *sg = ic->ic_superg; + struct ieee80211_tx_ampdu *tap; + struct mbuf *m, *head; + int ac; + + IEEE80211_LOCK(ic); + head = NULL; + for (ac = 0; ac < WME_NUM_AC; ac++) { + tap = &ni->ni_tx_ampdu[ac]; + m = tap->txa_private; + if (m != NULL) { + tap->txa_private = NULL; + stageq_remove(&sg->ff_stageq[ac], m); + m->m_nextpkt = head; + head = m; + } + } + IEEE80211_UNLOCK(ic); + + for (m = head; m != NULL; m = m->m_nextpkt) { + m_freem(m); + ieee80211_free_node(ni); + } +} + +/* + * Switch between turbo and non-turbo operating modes. + * Use the specified channel flags to locate the new + * channel, update 802.11 state, and then call back into + * the driver to effect the change. + */ +void +ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags) +{ + struct ieee80211com *ic = vap->iv_ic; + struct ieee80211_channel *chan; + + chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags); + if (chan == NULL) { /* XXX should not happen */ + IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, + "%s: no channel with freq %u flags 0x%x\n", + __func__, ic->ic_bsschan->ic_freq, newflags); + return; + } + + IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, + "%s: %s -> %s (freq %u flags 0x%x)\n", __func__, + ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)], + ieee80211_phymode_name[ieee80211_chan2mode(chan)], + chan->ic_freq, chan->ic_flags); + + ic->ic_bsschan = chan; + ic->ic_prevchan = ic->ic_curchan; + ic->ic_curchan = chan; + ic->ic_rt = ieee80211_get_ratetable(chan); + ic->ic_set_channel(ic); + ieee80211_radiotap_chan_change(ic); + /* NB: do not need to reset ERP state 'cuz we're in sta mode */ +} + +/* + * Return the current ``state'' of an Atheros capbility. + * If associated in station mode report the negotiated + * setting. Otherwise report the current setting. + */ +static int +getathcap(struct ieee80211vap *vap, int cap) +{ + if (vap->iv_opmode == IEEE80211_M_STA && + vap->iv_state == IEEE80211_S_RUN) + return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0; + else + return (vap->iv_flags & cap) != 0; +} + +static int +superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) +{ + switch (ireq->i_type) { + case IEEE80211_IOC_FF: + ireq->i_val = getathcap(vap, IEEE80211_F_FF); + break; + case IEEE80211_IOC_TURBOP: + ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP); + break; + default: + return ENOSYS; + } + return 0; +} +IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211); + +static int +superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) +{ + switch (ireq->i_type) { + case IEEE80211_IOC_FF: + if (ireq->i_val) { + if ((vap->iv_caps & IEEE80211_C_FF) == 0) + return EOPNOTSUPP; + vap->iv_flags |= IEEE80211_F_FF; + } else + vap->iv_flags &= ~IEEE80211_F_FF; + return ENETRESET; + case IEEE80211_IOC_TURBOP: + if (ireq->i_val) { + if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0) + return EOPNOTSUPP; + vap->iv_flags |= IEEE80211_F_TURBOP; + } else + vap->iv_flags &= ~IEEE80211_F_TURBOP; + return ENETRESET; + default: + return ENOSYS; + } + return 0; +} +IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211); |