if_ath_tx_ht.c revision 219214 
1/*-
2 * Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer,
10 *    without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13 *    redistribution must be conditioned upon including a substantially
14 *    similar Disclaimer requirement for further binary redistribution.
15 *
16 * NO WARRANTY
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGES.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/sys/dev/ath/if_ath_tx_ht.c 219214 2011-03-03 03:02:06Z adrian $");
32
33#include "opt_inet.h"
34#include "opt_ath.h"
35#include "opt_wlan.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/sysctl.h>
40#include <sys/mbuf.h>
41#include <sys/malloc.h>
42#include <sys/lock.h>
43#include <sys/mutex.h>
44#include <sys/kernel.h>
45#include <sys/socket.h>
46#include <sys/sockio.h>
47#include <sys/errno.h>
48#include <sys/callout.h>
49#include <sys/bus.h>
50#include <sys/endian.h>
51#include <sys/kthread.h>
52#include <sys/taskqueue.h>
53#include <sys/priv.h>
54
55#include <machine/bus.h>
56
57#include <net/if.h>
58#include <net/if_dl.h>
59#include <net/if_media.h>
60#include <net/if_types.h>
61#include <net/if_arp.h>
62#include <net/ethernet.h>
63#include <net/if_llc.h>
64
65#include <net80211/ieee80211_var.h>
66#include <net80211/ieee80211_regdomain.h>
67#ifdef IEEE80211_SUPPORT_SUPERG
68#include <net80211/ieee80211_superg.h>
69#endif
70#ifdef IEEE80211_SUPPORT_TDMA
71#include <net80211/ieee80211_tdma.h>
72#endif
73
74#include <net/bpf.h>
75
76#ifdef INET
77#include <netinet/in.h>
78#include <netinet/if_ether.h>
79#endif
80
81#include <dev/ath/if_athvar.h>
82#include <dev/ath/ath_hal/ah_devid.h>		/* XXX for softled */
83#include <dev/ath/ath_hal/ah_diagcodes.h>
84
85#ifdef ATH_TX99_DIAG
86#include <dev/ath/ath_tx99/ath_tx99.h>
87#endif
88
89#include <dev/ath/if_ath_tx_ht.h>
90
91/*
92 * Setup a 11n rate series structure
93 *
94 * This should be called for both legacy and MCS rates.
95 */
96static void
97ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
98    HAL_11N_RATE_SERIES *series, unsigned int pktlen, uint8_t *rix,
99    uint8_t *try, int flags)
100{
101	struct ieee80211com *ic = ni->ni_ic;
102	struct ath_hal *ah = sc->sc_ah;
103	HAL_BOOL shortPreamble = AH_FALSE;
104	const HAL_RATE_TABLE *rt = sc->sc_currates;
105	int i;
106
107	if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
108	    (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
109		shortPreamble = AH_TRUE;
110
111	memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
112	for (i = 0; i < 4;  i++) {
113		/* Only set flags for actual TX attempts */
114		if (try[i] == 0)
115			continue;
116
117		series[i].Tries = try[i];
118
119		/*
120		 * XXX this isn't strictly correct - sc_txchainmask
121		 * XXX isn't the currently active chainmask;
122		 * XXX it's the interface chainmask at startup.
123		 * XXX It's overridden in the HAL rate scenario function
124		 * XXX for now.
125		 */
126		series[i].ChSel = sc->sc_txchainmask;
127
128		if (flags & (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
129			series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
130
131#if 0
132		if (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40)
133			series[i].RateFlags |= HAL_RATESERIES_2040;
134
135		/*
136		 * The hardware only supports short-gi in 40mhz mode -
137		 * if later hardware supports it in 20mhz mode, be sure
138		 * to add the relevant check here.
139		 */
140		if (ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40)
141			series[i].RateFlags |= HAL_RATESERIES_HALFGI;
142#endif
143
144		series[i].Rate = rt->info[rix[i]].rateCode;
145		/* the short preamble field is only applicable for non-MCS rates */
146		if (shortPreamble && ! (series[i].Rate & IEEE80211_RATE_MCS))
147			series[i].Rate |= rt->info[rix[i]].shortPreamble;
148
149		/* PktDuration doesn't include slot, ACK, RTS, etc timing - it's just the packet duration */
150		if (series[i].Rate & IEEE80211_RATE_MCS) {
151			series[i].PktDuration =
152			    ath_computedur_ht(pktlen
153				, series[i].Rate
154				, ic->ic_txstream
155				, 0 /* disable 20/40 for now */
156				, series[i].RateFlags & HAL_RATESERIES_HALFGI);
157		} else {
158			series[i].PktDuration = ath_hal_computetxtime(ah,
159			    rt, pktlen, rix[i], shortPreamble);
160		}
161	}
162}
163
164#if 0
165static void
166ath_rateseries_print(HAL_11N_RATE_SERIES *series)
167{
168	int i;
169	for (i = 0; i < 4; i++) {
170		printf("series %d: rate %x; tries %d; pktDuration %d; chSel %d; rateFlags %x\n",
171		    i,
172		    series[i].Rate,
173		    series[i].Tries,
174		    series[i].PktDuration,
175		    series[i].ChSel,
176		    series[i].RateFlags);
177	}
178}
179#endif
180
181/*
182 * Setup the 11n rate scenario and burst duration for the given TX descriptor
183 * list.
184 *
185 * This isn't useful for sending beacon frames, which has different needs
186 * wrt what's passed into the rate scenario function.
187 */
188
189void
190ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, struct ath_buf *bf,
191    int pktlen, int flags, uint8_t ctsrate, int is_pspoll, uint8_t *rix, uint8_t *try)
192{
193	HAL_11N_RATE_SERIES series[4];
194	struct ath_desc *ds = bf->bf_desc;
195	struct ath_desc *lastds = NULL;
196	struct ath_hal *ah = sc->sc_ah;
197
198	/* Setup rate scenario */
199	memset(&series, 0, sizeof(series));
200
201	ath_rateseries_setup(sc, ni, series, pktlen, rix, try, flags);
202
203	/* Enforce AR5416 aggregate limit - can't do RTS w/ an agg frame > 8k */
204
205	/* Enforce RTS and CTS are mutually exclusive */
206
207	/* Get a pointer to the last tx descriptor in the list */
208	lastds = &bf->bf_desc[bf->bf_nseg - 1];
209
210#if 0
211	printf("pktlen: %d; flags 0x%x\n", pktlen, flags);
212	ath_rateseries_print(series);
213#endif
214
215	/* Set rate scenario */
216	ath_hal_set11nratescenario(ah, ds,
217	    !is_pspoll,	/* whether to override the duration or not */
218			/* don't allow hardware to override the duration on ps-poll packets */
219	    ctsrate,	/* rts/cts rate */
220	    series,	/* 11n rate series */
221	    4,		/* number of series */
222	    flags);
223
224	/* Setup the last descriptor in the chain */
225	ath_hal_setuplasttxdesc(ah, lastds, ds);
226
227	/* Set burst duration */
228	/* This should only be done if aggregate protection is enabled */
229	//ath_hal_set11nburstduration(ah, ds, 8192);
230}
231