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freebsd-dev/sys/dev/rtwn/if_rtwn_tx.c
Andriy Voskoboinyk 7453645f2a rtwn(4), urtwn(4): merge common code, add support for 11ac devices. 
All devices:
- add support for rate adaptation via ieee80211_amrr(9);
- use short preamble for transmitted frames when needed;
- multi-bss support:
 * for RTL8821AU: 2 VAPs at the same time;
 * other: 1 any VAP + 1 sta VAP.
RTL8188CE:
- fix IQ calibration bug (reason of significant speed degradation);
- add h/w crypto acceleration support.
USB:
- A-MPDU Tx support;
- short GI support;
Other:
- add support for RTL8812AU / RTL8821AU chipsets
(a/b/g/n only; no ac yet);
- split merged code into subparts:
 * bus glue (usb/*, pci/*, rtl*/usb/*, rtl*/pci/*)
 * common (if_rtwn*)
 * chip-specific (rtl*/*)
- various other bugfixes.

Due to code reorganization, module names / requirements were changed too:
urtwn urtwnfw -> rtwn rtwn_usb rtwnfw
rtwn  rtwnfw  -> rtwn rtwn_pci rtwnfw

Tested with RTL8188CE, RTL8188CUS, RTL8188EU and RTL8821AU.

Tested by:	kevlo, garga,
		Peter Garshtja <peter.garshtja@ambient-md.com>,
		Kevin McAleavey <kevin.mcaleavey@knosproject.com>,
		Ilias-Dimitrios Vrachnis <id@vrachnis.com>,
		<otacilio.neto@bsd.com.br>
Relnotes:	yes
2016-10-17 20:38:24 +00:00

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/* $OpenBSD: if_urtwn.c,v 1.16 2011/02/10 17:26:40 jakemsr Exp $ */
/*-
* Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr>
* Copyright (c) 2014 Kevin Lo <kevlo@FreeBSD.org>
* Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/taskqueue.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/ethernet.h>
#include <net/if_media.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_radiotap.h>
#include <net80211/ieee80211_ratectl.h>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/ieee80211_superg.h>
#endif
#include <dev/rtwn/if_rtwnreg.h>
#include <dev/rtwn/if_rtwnvar.h>
#include <dev/rtwn/if_rtwn_beacon.h>
#include <dev/rtwn/if_rtwn_debug.h>
#include <dev/rtwn/if_rtwn_ridx.h>
#include <dev/rtwn/if_rtwn_tx.h>
void
rtwn_drain_mbufq(struct rtwn_softc *sc)
{
struct mbuf *m;
struct ieee80211_node *ni;
RTWN_ASSERT_LOCKED(sc);
while ((m = mbufq_dequeue(&sc->sc_snd)) != NULL) {
ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
m->m_pkthdr.rcvif = NULL;
ieee80211_free_node(ni);
m_freem(m);
}
}
#ifdef IEEE80211_SUPPORT_SUPERG
void
rtwn_ff_flush_all(struct rtwn_softc *sc, union sec_param *data)
{
struct ieee80211com *ic = &sc->sc_ic;
RTWN_UNLOCK(sc);
ieee80211_ff_flush_all(ic);
RTWN_LOCK(sc);
}
#endif
static uint8_t
rtwn_get_cipher(u_int ic_cipher)
{
uint8_t cipher;
switch (ic_cipher) {
case IEEE80211_CIPHER_NONE:
cipher = RTWN_TXDW1_CIPHER_NONE;
break;
case IEEE80211_CIPHER_WEP:
case IEEE80211_CIPHER_TKIP:
cipher = RTWN_TXDW1_CIPHER_RC4;
break;
case IEEE80211_CIPHER_AES_CCM:
cipher = RTWN_TXDW1_CIPHER_AES;
break;
default:
KASSERT(0, ("%s: unknown cipher %d\n", __func__,
ic_cipher));
return (RTWN_TXDW1_CIPHER_SM4);
}
return (cipher);
}
static int
rtwn_tx_data(struct rtwn_softc *sc, struct ieee80211_node *ni,
struct mbuf *m)
{
const struct ieee80211_txparam *tp;
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_key *k = NULL;
struct ieee80211_channel *chan;
struct ieee80211_frame *wh;
struct rtwn_tx_desc_common *txd;
struct rtwn_tx_buf buf;
uint8_t rate, ridx, type;
u_int cipher;
int ismcast, maxretry;
RTWN_ASSERT_LOCKED(sc);
wh = mtod(m, struct ieee80211_frame *);
type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
chan = (ni->ni_chan != IEEE80211_CHAN_ANYC) ?
ni->ni_chan : ic->ic_curchan;
tp = &vap->iv_txparms[ieee80211_chan2mode(chan)];
maxretry = tp->maxretry;
/* Choose a TX rate index. */
if (type == IEEE80211_FC0_TYPE_MGT)
rate = tp->mgmtrate;
else if (ismcast)
rate = tp->mcastrate;
else if (tp->ucastrate != IEEE80211_FIXED_RATE_NONE)
rate = tp->ucastrate;
else if (m->m_flags & M_EAPOL)
rate = tp->mgmtrate;
else {
if (sc->sc_ratectl == RTWN_RATECTL_NET80211) {
/* XXX pass pktlen */
(void) ieee80211_ratectl_rate(ni, NULL, 0);
rate = ni->ni_txrate;
} else {
if (ni->ni_flags & IEEE80211_NODE_HT)
rate = IEEE80211_RATE_MCS | 0x4; /* MCS4 */
else if (ic->ic_curmode != IEEE80211_MODE_11B)
rate = ridx2rate[RTWN_RIDX_OFDM36];
else
rate = ridx2rate[RTWN_RIDX_CCK55];
}
}
ridx = rate2ridx(rate);
cipher = IEEE80211_CIPHER_NONE;
if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
k = ieee80211_crypto_encap(ni, m);
if (k == NULL) {
device_printf(sc->sc_dev,
"ieee80211_crypto_encap returns NULL.\n");
return (ENOBUFS);
}
if (!(k->wk_flags & IEEE80211_KEY_SWCRYPT))
cipher = k->wk_cipher->ic_cipher;
/* in case packet header moved, reset pointer */
wh = mtod(m, struct ieee80211_frame *);
}
/* Fill Tx descriptor. */
txd = (struct rtwn_tx_desc_common *)&buf;
memset(txd, 0, sc->txdesc_len);
txd->txdw1 = htole32(SM(RTWN_TXDW1_CIPHER, rtwn_get_cipher(cipher)));
rtwn_fill_tx_desc(sc, ni, m, txd, ridx, maxretry);
if (ieee80211_radiotap_active_vap(vap)) {
struct rtwn_tx_radiotap_header *tap = &sc->sc_txtap;
tap->wt_flags = rtwn_tx_radiotap_flags(sc, txd);
if (k != NULL)
tap->wt_flags |= IEEE80211_RADIOTAP_F_WEP;
ieee80211_radiotap_tx(vap, m);
}
return (rtwn_tx_start(sc, ni, m, (uint8_t *)txd, type, 0));
}
static int
rtwn_tx_raw(struct rtwn_softc *sc, struct ieee80211_node *ni,
struct mbuf *m, const struct ieee80211_bpf_params *params)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_key *k = NULL;
struct ieee80211_frame *wh;
struct rtwn_tx_desc_common *txd;
struct rtwn_tx_buf buf;
uint8_t type;
u_int cipher;
/* Encrypt the frame if need be. */
cipher = IEEE80211_CIPHER_NONE;
if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
/* Retrieve key for TX. */
k = ieee80211_crypto_encap(ni, m);
if (k == NULL) {
device_printf(sc->sc_dev,
"ieee80211_crypto_encap returns NULL.\n");
return (ENOBUFS);
}
if (!(k->wk_flags & IEEE80211_KEY_SWCRYPT))
cipher = k->wk_cipher->ic_cipher;
}
wh = mtod(m, struct ieee80211_frame *);
type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
/* Fill Tx descriptor. */
txd = (struct rtwn_tx_desc_common *)&buf;
memset(txd, 0, sc->txdesc_len);
txd->txdw1 = htole32(SM(RTWN_TXDW1_CIPHER, rtwn_get_cipher(cipher)));
rtwn_fill_tx_desc_raw(sc, ni, m, txd, params);
if (ieee80211_radiotap_active_vap(vap)) {
struct rtwn_tx_radiotap_header *tap = &sc->sc_txtap;
tap->wt_flags = rtwn_tx_radiotap_flags(sc, txd);
if (k != NULL)
tap->wt_flags |= IEEE80211_RADIOTAP_F_WEP;
ieee80211_radiotap_tx(vap, m);
}
return (rtwn_tx_start(sc, ni, m, (uint8_t *)txd, type, 0));
}
int
rtwn_transmit(struct ieee80211com *ic, struct mbuf *m)
{
struct rtwn_softc *sc = ic->ic_softc;
int error;
RTWN_LOCK(sc);
if ((sc->sc_flags & RTWN_RUNNING) == 0) {
RTWN_UNLOCK(sc);
return (ENXIO);
}
error = mbufq_enqueue(&sc->sc_snd, m);
if (error) {
RTWN_UNLOCK(sc);
return (error);
}
rtwn_start(sc);
RTWN_UNLOCK(sc);
return (0);
}
void
rtwn_start(struct rtwn_softc *sc)
{
struct ieee80211_node *ni;
struct mbuf *m;
RTWN_ASSERT_LOCKED(sc);
while ((m = mbufq_dequeue(&sc->sc_snd)) != NULL) {
if (sc->qfullmsk != 0) {
mbufq_prepend(&sc->sc_snd, m);
break;
}
ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
m->m_pkthdr.rcvif = NULL;
RTWN_DPRINTF(sc, RTWN_DEBUG_XMIT,
"%s: called; m %p, ni %p\n", __func__, m, ni);
if (rtwn_tx_data(sc, ni, m) != 0) {
if_inc_counter(ni->ni_vap->iv_ifp,
IFCOUNTER_OERRORS, 1);
m_freem(m);
#ifdef D4054
ieee80211_tx_watchdog_refresh(ni->ni_ic, -1, 0);
#endif
ieee80211_free_node(ni);
break;
}
}
}
int
rtwn_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
const struct ieee80211_bpf_params *params)
{
struct ieee80211com *ic = ni->ni_ic;
struct rtwn_softc *sc = ic->ic_softc;
int error;
RTWN_DPRINTF(sc, RTWN_DEBUG_XMIT, "%s: called; m %p, ni %p\n",
__func__, m, ni);
/* prevent management frames from being sent if we're not ready */
RTWN_LOCK(sc);
if (!(sc->sc_flags & RTWN_RUNNING)) {
error = ENETDOWN;
goto end;
}
if (sc->qfullmsk != 0) {
error = ENOBUFS;
goto end;
}
if (params == NULL) {
/*
* Legacy path; interpret frame contents to decide
* precisely how to send the frame.
*/
error = rtwn_tx_data(sc, ni, m);
} else {
/*
* Caller supplied explicit parameters to use in
* sending the frame.
*/
error = rtwn_tx_raw(sc, ni, m, params);
}
end:
if (error != 0) {
if (m->m_flags & M_TXCB)
ieee80211_process_callback(ni, m, 1);
m_freem(m);
}
RTWN_UNLOCK(sc);
return (error);
}
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