375307d411
I couldn't think of a way to maintain the hardware TXQ locks _and_ layer on top of that per-TXQ software queuing and any other kind of fine-grained locks (eg per-TID, or per-node locks.) So for now, to facilitate some further code refactoring and development as part of the final push to get software queue ps-poll and u-apsd handling into this driver, just do away with them entirely. I may eventually bring them back at some point, when it looks slightly more architectually cleaner to do so. But as it stands at the present, it's not really buying us much: * in order to properly serialise things and not get bitten by scheduling and locking interactions with things higher up in the stack, we need to wrap the whole TX path in a long held lock. Otherwise we can end up being pre-empted during frame handling, resulting in some out of order frame handling between sequence number allocation and encryption handling (ie, the seqno and the CCMP IV get out of sequence); * .. so whilst that's the case, holding the lock for that long means that we're acquiring and releasing the TXQ lock _inside_ that context; * And we also acquire it per-frame during frame completion, but we currently can't hold the lock for the duration of the TX completion as we need to call net80211 layer things with the locks _unheld_ to avoid LOR. * .. the other places were grab that lock are reset/flush, which don't happen often. My eventual aim is to change the TX path so all rejected frame transmissions and all frame completions result in any ieee80211_free_node() calls to occur outside of the TX lock; then I can cut back on the amount of locking that goes on here. There may be some LORs that occur when ieee80211_free_node() is called when the TX queue path fails; I'll begin to address these in follow-up commits.
853 lines
24 KiB
C
853 lines
24 KiB
C
/*-
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* Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd.
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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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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_ath.h"
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#include "opt_wlan.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/errno.h>
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#include <sys/callout.h>
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#include <sys/bus.h>
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#include <sys/endian.h>
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#include <sys/kthread.h>
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#include <sys/taskqueue.h>
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#include <sys/priv.h>
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#include <machine/bus.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/if_types.h>
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#include <net/if_arp.h>
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#include <net/ethernet.h>
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#include <net/if_llc.h>
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_regdomain.h>
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#ifdef IEEE80211_SUPPORT_SUPERG
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#include <net80211/ieee80211_superg.h>
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#endif
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#ifdef IEEE80211_SUPPORT_TDMA
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#include <net80211/ieee80211_tdma.h>
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#endif
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#include <net/bpf.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#endif
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#include <dev/ath/if_athvar.h>
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#include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */
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#include <dev/ath/ath_hal/ah_diagcodes.h>
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#ifdef ATH_TX99_DIAG
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#include <dev/ath/ath_tx99/ath_tx99.h>
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#endif
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#include <dev/ath/if_ath_tx.h> /* XXX for some support functions */
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#include <dev/ath/if_ath_tx_ht.h>
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#include <dev/ath/if_athrate.h>
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#include <dev/ath/if_ath_debug.h>
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/*
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* XXX net80211?
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*/
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#define IEEE80211_AMPDU_SUBFRAME_DEFAULT 32
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#define ATH_AGGR_DELIM_SZ 4 /* delimiter size */
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#define ATH_AGGR_MINPLEN 256 /* in bytes, minimum packet length */
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/* number of delimiters for encryption padding */
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#define ATH_AGGR_ENCRYPTDELIM 10
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/*
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* returns delimiter padding required given the packet length
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*/
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#define ATH_AGGR_GET_NDELIM(_len) \
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(((((_len) + ATH_AGGR_DELIM_SZ) < ATH_AGGR_MINPLEN) ? \
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(ATH_AGGR_MINPLEN - (_len) - ATH_AGGR_DELIM_SZ) : 0) >> 2)
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#define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
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int ath_max_4ms_framelen[4][32] = {
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[MCS_HT20] = {
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3212, 6432, 9648, 12864, 19300, 25736, 28952, 32172,
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6424, 12852, 19280, 25708, 38568, 51424, 57852, 64280,
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9628, 19260, 28896, 38528, 57792, 65532, 65532, 65532,
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12828, 25656, 38488, 51320, 65532, 65532, 65532, 65532,
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},
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[MCS_HT20_SGI] = {
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3572, 7144, 10720, 14296, 21444, 28596, 32172, 35744,
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7140, 14284, 21428, 28568, 42856, 57144, 64288, 65532,
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10700, 21408, 32112, 42816, 64228, 65532, 65532, 65532,
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14256, 28516, 42780, 57040, 65532, 65532, 65532, 65532,
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},
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[MCS_HT40] = {
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6680, 13360, 20044, 26724, 40092, 53456, 60140, 65532,
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13348, 26700, 40052, 53400, 65532, 65532, 65532, 65532,
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20004, 40008, 60016, 65532, 65532, 65532, 65532, 65532,
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26644, 53292, 65532, 65532, 65532, 65532, 65532, 65532,
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},
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[MCS_HT40_SGI] = {
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7420, 14844, 22272, 29696, 44544, 59396, 65532, 65532,
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14832, 29668, 44504, 59340, 65532, 65532, 65532, 65532,
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22232, 44464, 65532, 65532, 65532, 65532, 65532, 65532,
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29616, 59232, 65532, 65532, 65532, 65532, 65532, 65532,
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}
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};
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/*
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* XXX should be in net80211
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*/
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static int ieee80211_mpdudensity_map[] = {
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0, /* IEEE80211_HTCAP_MPDUDENSITY_NA */
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25, /* IEEE80211_HTCAP_MPDUDENSITY_025 */
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50, /* IEEE80211_HTCAP_MPDUDENSITY_05 */
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100, /* IEEE80211_HTCAP_MPDUDENSITY_1 */
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200, /* IEEE80211_HTCAP_MPDUDENSITY_2 */
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400, /* IEEE80211_HTCAP_MPDUDENSITY_4 */
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800, /* IEEE80211_HTCAP_MPDUDENSITY_8 */
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1600, /* IEEE80211_HTCAP_MPDUDENSITY_16 */
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};
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/*
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* XXX should be in the HAL/net80211 ?
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*/
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#define BITS_PER_BYTE 8
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#define OFDM_PLCP_BITS 22
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#define HT_RC_2_MCS(_rc) ((_rc) & 0x7f)
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#define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
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#define L_STF 8
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#define L_LTF 8
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#define L_SIG 4
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#define HT_SIG 8
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#define HT_STF 4
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#define HT_LTF(_ns) (4 * (_ns))
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#define SYMBOL_TIME(_ns) ((_ns) << 2) // ns * 4 us
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#define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) // ns * 3.6 us
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#define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
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#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
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#define IS_HT_RATE(_rate) ((_rate) & 0x80)
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const uint32_t bits_per_symbol[][2] = {
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/* 20MHz 40MHz */
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{ 26, 54 }, // 0: BPSK
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{ 52, 108 }, // 1: QPSK 1/2
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{ 78, 162 }, // 2: QPSK 3/4
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{ 104, 216 }, // 3: 16-QAM 1/2
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{ 156, 324 }, // 4: 16-QAM 3/4
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{ 208, 432 }, // 5: 64-QAM 2/3
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{ 234, 486 }, // 6: 64-QAM 3/4
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{ 260, 540 }, // 7: 64-QAM 5/6
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{ 52, 108 }, // 8: BPSK
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{ 104, 216 }, // 9: QPSK 1/2
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{ 156, 324 }, // 10: QPSK 3/4
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{ 208, 432 }, // 11: 16-QAM 1/2
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{ 312, 648 }, // 12: 16-QAM 3/4
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{ 416, 864 }, // 13: 64-QAM 2/3
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{ 468, 972 }, // 14: 64-QAM 3/4
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{ 520, 1080 }, // 15: 64-QAM 5/6
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{ 78, 162 }, // 16: BPSK
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{ 156, 324 }, // 17: QPSK 1/2
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{ 234, 486 }, // 18: QPSK 3/4
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{ 312, 648 }, // 19: 16-QAM 1/2
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{ 468, 972 }, // 20: 16-QAM 3/4
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{ 624, 1296 }, // 21: 64-QAM 2/3
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{ 702, 1458 }, // 22: 64-QAM 3/4
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{ 780, 1620 }, // 23: 64-QAM 5/6
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{ 104, 216 }, // 24: BPSK
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{ 208, 432 }, // 25: QPSK 1/2
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{ 312, 648 }, // 26: QPSK 3/4
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{ 416, 864 }, // 27: 16-QAM 1/2
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{ 624, 1296 }, // 28: 16-QAM 3/4
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{ 832, 1728 }, // 29: 64-QAM 2/3
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{ 936, 1944 }, // 30: 64-QAM 3/4
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{ 1040, 2160 }, // 31: 64-QAM 5/6
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};
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/*
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* Fill in the rate array information based on the current
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* node configuration and the choices made by the rate
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* selection code and ath_buf setup code.
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*
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* Later on, this may end up also being made by the
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* rate control code, but for now it can live here.
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*
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* This needs to be called just before the packet is
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* queued to the software queue or hardware queue,
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* so all of the needed fields in bf_state are setup.
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*/
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void
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ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf)
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{
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struct ieee80211_node *ni = bf->bf_node;
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struct ieee80211com *ic = ni->ni_ic;
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const HAL_RATE_TABLE *rt = sc->sc_currates;
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struct ath_rc_series *rc = bf->bf_state.bfs_rc;
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uint8_t rate;
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int i;
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for (i = 0; i < ATH_RC_NUM; i++) {
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rc[i].flags = 0;
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if (rc[i].tries == 0)
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continue;
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rate = rt->info[rc[i].rix].rateCode;
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/*
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* XXX only do this for legacy rates?
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*/
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if (bf->bf_state.bfs_shpream)
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rate |= rt->info[rc[i].rix].shortPreamble;
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/*
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* Save this, used by the TX and completion code
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*/
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rc[i].ratecode = rate;
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if (bf->bf_state.bfs_txflags &
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(HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
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rc[i].flags |= ATH_RC_RTSCTS_FLAG;
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/* Only enable shortgi, 2040, dual-stream if HT is set */
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if (IS_HT_RATE(rate)) {
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rc[i].flags |= ATH_RC_HT_FLAG;
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if (ni->ni_chw == 40)
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rc[i].flags |= ATH_RC_CW40_FLAG;
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if (ni->ni_chw == 40 &&
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ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 &&
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ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40)
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rc[i].flags |= ATH_RC_SGI_FLAG;
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if (ni->ni_chw == 20 &&
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ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 &&
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ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20)
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rc[i].flags |= ATH_RC_SGI_FLAG;
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/* XXX dual stream? and 3-stream? */
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}
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/*
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* Calculate the maximum 4ms frame length based
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* on the MCS rate, SGI and channel width flags.
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*/
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if ((rc[i].flags & ATH_RC_HT_FLAG) &&
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(HT_RC_2_MCS(rate) < 32)) {
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int j;
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if (rc[i].flags & ATH_RC_CW40_FLAG) {
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if (rc[i].flags & ATH_RC_SGI_FLAG)
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j = MCS_HT40_SGI;
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else
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j = MCS_HT40;
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} else {
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if (rc[i].flags & ATH_RC_SGI_FLAG)
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j = MCS_HT20_SGI;
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else
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j = MCS_HT20;
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}
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rc[i].max4msframelen =
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ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)];
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} else
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rc[i].max4msframelen = 0;
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DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
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"%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n",
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__func__, i, rate, rc[i].flags, rc[i].max4msframelen);
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}
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}
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/*
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* Return the number of delimiters to be added to
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* meet the minimum required mpdudensity.
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*
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* Caller should make sure that the rate is HT.
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*
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* TODO: is this delimiter calculation supposed to be the
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* total frame length, the hdr length, the data length (including
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* delimiters, padding, CRC, etc) or ?
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*
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* TODO: this should ensure that the rate control information
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* HAS been setup for the first rate.
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*
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* TODO: ensure this is only called for MCS rates.
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*
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* TODO: enforce MCS < 31
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*/
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static int
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ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf,
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uint16_t pktlen)
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{
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const HAL_RATE_TABLE *rt = sc->sc_currates;
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struct ieee80211_node *ni = first_bf->bf_node;
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struct ieee80211vap *vap = ni->ni_vap;
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int ndelim, mindelim = 0;
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int mpdudensity; /* in 1/100'th of a microsecond */
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uint8_t rc, rix, flags;
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int width, half_gi;
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uint32_t nsymbits, nsymbols;
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uint16_t minlen;
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/*
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* vap->iv_ampdu_density is a value, rather than the actual
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* density.
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*/
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if (vap->iv_ampdu_density > IEEE80211_HTCAP_MPDUDENSITY_16)
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mpdudensity = 1600; /* maximum density */
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else
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mpdudensity = ieee80211_mpdudensity_map[vap->iv_ampdu_density];
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/* Select standard number of delimiters based on frame length */
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ndelim = ATH_AGGR_GET_NDELIM(pktlen);
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/*
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* If encryption is enabled, add extra delimiters to let the
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* crypto hardware catch up. This could be tuned per-MAC and
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* per-rate, but for now we'll simply assume encryption is
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* always enabled.
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*/
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ndelim += ATH_AGGR_ENCRYPTDELIM;
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/*
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* For AR9380, there's a minimum number of delimeters
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* required when doing RTS.
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*/
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if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR)
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&& ndelim < AH_FIRST_DESC_NDELIMS)
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ndelim = AH_FIRST_DESC_NDELIMS;
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DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
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"%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n",
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__func__, pktlen, ndelim, mpdudensity);
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/*
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* If the MPDU density is 0, we can return here.
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* Otherwise, we need to convert the desired mpdudensity
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* into a byte length, based on the rate in the subframe.
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*/
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if (mpdudensity == 0)
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return ndelim;
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/*
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* Convert desired mpdu density from microeconds to bytes based
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* on highest rate in rate series (i.e. first rate) to determine
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* required minimum length for subframe. Take into account
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* whether high rate is 20 or 40Mhz and half or full GI.
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*/
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rix = first_bf->bf_state.bfs_rc[0].rix;
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rc = rt->info[rix].rateCode;
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flags = first_bf->bf_state.bfs_rc[0].flags;
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width = !! (flags & ATH_RC_CW40_FLAG);
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half_gi = !! (flags & ATH_RC_SGI_FLAG);
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/*
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* mpdudensity is in 1/100th of a usec, so divide by 100
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*/
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if (half_gi)
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nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity);
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else
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nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity);
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nsymbols /= 100;
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if (nsymbols == 0)
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nsymbols = 1;
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nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
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minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
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/*
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* Min length is the minimum frame length for the
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* required MPDU density.
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*/
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if (pktlen < minlen) {
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mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ;
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ndelim = MAX(mindelim, ndelim);
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}
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DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
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"%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n",
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__func__, pktlen, minlen, rix, rc, width, half_gi, ndelim);
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return ndelim;
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}
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/*
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* Fetch the aggregation limit.
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*
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* It's the lowest of the four rate series 4ms frame length.
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*/
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static int
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ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf)
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{
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int amin = 65530;
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int i;
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|
|
for (i = 0; i < ATH_RC_NUM; i++) {
|
|
if (bf->bf_state.bfs_rc[i].tries == 0)
|
|
continue;
|
|
amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen);
|
|
}
|
|
|
|
DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n",
|
|
__func__, amin);
|
|
|
|
return amin;
|
|
}
|
|
|
|
/*
|
|
* Setup a 11n rate series structure
|
|
*
|
|
* This should be called for both legacy and MCS rates.
|
|
*
|
|
* It, along with ath_buf_set_rate, must be called -after- a burst
|
|
* or aggregate is setup.
|
|
*/
|
|
static void
|
|
ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
|
|
struct ath_buf *bf, HAL_11N_RATE_SERIES *series)
|
|
{
|
|
struct ieee80211com *ic = ni->ni_ic;
|
|
struct ath_hal *ah = sc->sc_ah;
|
|
HAL_BOOL shortPreamble = AH_FALSE;
|
|
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
|
int i;
|
|
int pktlen;
|
|
int flags = bf->bf_state.bfs_txflags;
|
|
struct ath_rc_series *rc = bf->bf_state.bfs_rc;
|
|
|
|
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
|
|
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
|
|
shortPreamble = AH_TRUE;
|
|
|
|
/*
|
|
* If this is the first frame in an aggregate series,
|
|
* use the aggregate length.
|
|
*/
|
|
if (bf->bf_state.bfs_aggr)
|
|
pktlen = bf->bf_state.bfs_al;
|
|
else
|
|
pktlen = bf->bf_state.bfs_pktlen;
|
|
|
|
/*
|
|
* XXX TODO: modify this routine to use the bfs_rc[x].flags
|
|
* XXX fields.
|
|
*/
|
|
memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
|
|
for (i = 0; i < ATH_RC_NUM; i++) {
|
|
/* Only set flags for actual TX attempts */
|
|
if (rc[i].tries == 0)
|
|
continue;
|
|
|
|
series[i].Tries = rc[i].tries;
|
|
|
|
/*
|
|
* XXX this isn't strictly correct - sc_txchainmask
|
|
* XXX isn't the currently active chainmask;
|
|
* XXX it's the interface chainmask at startup.
|
|
* XXX It's overridden in the HAL rate scenario function
|
|
* XXX for now.
|
|
*/
|
|
series[i].ChSel = sc->sc_txchainmask;
|
|
|
|
if (flags & (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
|
|
series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
|
|
|
|
/*
|
|
* Transmit 40MHz frames only if the node has negotiated
|
|
* it rather than whether the node is capable of it or not.
|
|
* It's subtly different in the hostap case.
|
|
*/
|
|
if (ni->ni_chw == 40)
|
|
series[i].RateFlags |= HAL_RATESERIES_2040;
|
|
|
|
/*
|
|
* Set short-GI only if the node has advertised it
|
|
* the channel width is suitable, and we support it.
|
|
* We don't currently have a "negotiated" set of bits -
|
|
* ni_htcap is what the remote end sends, not what this
|
|
* node is capable of.
|
|
*/
|
|
if (ni->ni_chw == 40 &&
|
|
ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 &&
|
|
ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40)
|
|
series[i].RateFlags |= HAL_RATESERIES_HALFGI;
|
|
|
|
if (ni->ni_chw == 20 &&
|
|
ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 &&
|
|
ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20)
|
|
series[i].RateFlags |= HAL_RATESERIES_HALFGI;
|
|
|
|
series[i].Rate = rt->info[rc[i].rix].rateCode;
|
|
series[i].RateIndex = rc[i].rix;
|
|
series[i].tx_power_cap = 0x3f; /* XXX for now */
|
|
|
|
/*
|
|
* PktDuration doesn't include slot, ACK, RTS, etc timing -
|
|
* it's just the packet duration
|
|
*/
|
|
if (series[i].Rate & IEEE80211_RATE_MCS) {
|
|
series[i].PktDuration =
|
|
ath_computedur_ht(pktlen
|
|
, series[i].Rate
|
|
, HT_RC_2_STREAMS(series[i].Rate)
|
|
, series[i].RateFlags & HAL_RATESERIES_2040
|
|
, series[i].RateFlags & HAL_RATESERIES_HALFGI);
|
|
} else {
|
|
if (shortPreamble)
|
|
series[i].Rate |=
|
|
rt->info[rc[i].rix].shortPreamble;
|
|
series[i].PktDuration = ath_hal_computetxtime(ah,
|
|
rt, pktlen, rc[i].rix, shortPreamble);
|
|
}
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
static void
|
|
ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series)
|
|
{
|
|
int i;
|
|
for (i = 0; i < ATH_RC_NUM; i++) {
|
|
device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; "
|
|
"pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n",
|
|
i,
|
|
series[i].Rate,
|
|
series[i].Tries,
|
|
series[i].PktDuration,
|
|
series[i].ChSel,
|
|
series[i].tx_power_cap,
|
|
series[i].RateFlags);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Setup the 11n rate scenario and burst duration for the given TX descriptor
|
|
* list.
|
|
*
|
|
* This isn't useful for sending beacon frames, which has different needs
|
|
* wrt what's passed into the rate scenario function.
|
|
*/
|
|
void
|
|
ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni,
|
|
struct ath_buf *bf)
|
|
{
|
|
HAL_11N_RATE_SERIES series[4];
|
|
struct ath_desc *ds = bf->bf_desc;
|
|
struct ath_hal *ah = sc->sc_ah;
|
|
int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL);
|
|
int ctsrate = bf->bf_state.bfs_ctsrate;
|
|
int flags = bf->bf_state.bfs_txflags;
|
|
|
|
/* Setup rate scenario */
|
|
memset(&series, 0, sizeof(series));
|
|
|
|
ath_rateseries_setup(sc, ni, bf, series);
|
|
|
|
#if 0
|
|
ath_rateseries_print(sc, series);
|
|
#endif
|
|
|
|
/* Set rate scenario */
|
|
/*
|
|
* Note: Don't allow hardware to override the duration on
|
|
* ps-poll packets.
|
|
*/
|
|
ath_hal_set11nratescenario(ah, ds,
|
|
!is_pspoll, /* whether to override the duration or not */
|
|
ctsrate, /* rts/cts rate */
|
|
series, /* 11n rate series */
|
|
4, /* number of series */
|
|
flags);
|
|
|
|
/* Set burst duration */
|
|
/*
|
|
* This is only required when doing 11n burst, not aggregation
|
|
* ie, if there's a second frame in a RIFS or A-MPDU burst
|
|
* w/ >1 A-MPDU frame bursting back to back.
|
|
* Normal A-MPDU doesn't do bursting -between- aggregates.
|
|
*
|
|
* .. and it's highly likely this won't ever be implemented
|
|
*/
|
|
//ath_hal_set11nburstduration(ah, ds, 8192);
|
|
}
|
|
|
|
/*
|
|
* Form an aggregate packet list.
|
|
*
|
|
* This function enforces the aggregate restrictions/requirements.
|
|
*
|
|
* These are:
|
|
*
|
|
* + The aggregate size maximum (64k for AR9160 and later, 8K for
|
|
* AR5416 when doing RTS frame protection.)
|
|
* + Maximum number of sub-frames for an aggregate
|
|
* + The aggregate delimiter size, giving MACs time to do whatever is
|
|
* needed before each frame
|
|
* + Enforce the BAW limit
|
|
*
|
|
* Each descriptor queued should have the DMA setup.
|
|
* The rate series, descriptor setup, linking, etc is all done
|
|
* externally. This routine simply chains them together.
|
|
* ath_tx_setds_11n() will take care of configuring the per-
|
|
* descriptor setup, and ath_buf_set_rate() will configure the
|
|
* rate control.
|
|
*
|
|
* The TID lock is required for the entirety of this function.
|
|
*
|
|
* If some code in another thread adds to the head of this
|
|
* list, very strange behaviour will occur. Since retransmission is the
|
|
* only reason this will occur, and this routine is designed to be called
|
|
* from within the scheduler task, it won't ever clash with the completion
|
|
* task.
|
|
*
|
|
* So if you want to call this from an upper layer context (eg, to direct-
|
|
* dispatch aggregate frames to the hardware), please keep this in mind.
|
|
*/
|
|
ATH_AGGR_STATUS
|
|
ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an,
|
|
struct ath_tid *tid, ath_bufhead *bf_q)
|
|
{
|
|
//struct ieee80211_node *ni = &an->an_node;
|
|
struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL;
|
|
int nframes = 0;
|
|
uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw;
|
|
struct ieee80211_tx_ampdu *tap;
|
|
int status = ATH_AGGR_DONE;
|
|
int prev_frames = 0; /* XXX for AR5416 burst, not done here */
|
|
int prev_al = 0; /* XXX also for AR5416 burst */
|
|
|
|
ATH_TX_LOCK_ASSERT(sc);
|
|
|
|
tap = ath_tx_get_tx_tid(an, tid->tid);
|
|
if (tap == NULL) {
|
|
status = ATH_AGGR_ERROR;
|
|
goto finish;
|
|
}
|
|
|
|
h_baw = tap->txa_wnd / 2;
|
|
|
|
for (;;) {
|
|
bf = ATH_TID_FIRST(tid);
|
|
if (bf_first == NULL)
|
|
bf_first = bf;
|
|
if (bf == NULL) {
|
|
status = ATH_AGGR_DONE;
|
|
break;
|
|
} else {
|
|
/*
|
|
* It's the first frame;
|
|
* set the aggregation limit based on the
|
|
* rate control decision that has been made.
|
|
*/
|
|
aggr_limit = ath_get_aggr_limit(sc, bf_first);
|
|
}
|
|
|
|
/* Set this early just so things don't get confused */
|
|
bf->bf_next = NULL;
|
|
|
|
/*
|
|
* Don't unlock the tid lock until we're sure we are going
|
|
* to queue this frame.
|
|
*/
|
|
|
|
/*
|
|
* If the frame doesn't have a sequence number that we're
|
|
* tracking in the BAW (eg NULL QOS data frame), we can't
|
|
* aggregate it. Stop the aggregation process; the sender
|
|
* can then TX what's in the list thus far and then
|
|
* TX the frame individually.
|
|
*/
|
|
if (! bf->bf_state.bfs_dobaw) {
|
|
status = ATH_AGGR_NONAGGR;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If any of the rates are non-HT, this packet
|
|
* can't be aggregated.
|
|
* XXX TODO: add a bf_state flag which gets marked
|
|
* if any active rate is non-HT.
|
|
*/
|
|
|
|
/*
|
|
* do not exceed aggregation limit
|
|
*/
|
|
al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen;
|
|
if (nframes &&
|
|
(aggr_limit < (al + bpad + al_delta + prev_al))) {
|
|
status = ATH_AGGR_LIMITED;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If RTS/CTS is set on the first frame, enforce
|
|
* the RTS aggregate limit.
|
|
*/
|
|
if (bf_first->bf_state.bfs_txflags &
|
|
(HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) {
|
|
if (nframes &&
|
|
(sc->sc_rts_aggr_limit <
|
|
(al + bpad + al_delta + prev_al))) {
|
|
status = ATH_AGGR_8K_LIMITED;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do not exceed subframe limit.
|
|
*/
|
|
if ((nframes + prev_frames) >= MIN((h_baw),
|
|
IEEE80211_AMPDU_SUBFRAME_DEFAULT)) {
|
|
status = ATH_AGGR_LIMITED;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If the current frame has an RTS/CTS configuration
|
|
* that differs from the first frame, override the
|
|
* subsequent frame with this config.
|
|
*/
|
|
bf->bf_state.bfs_txflags &=
|
|
~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
|
|
bf->bf_state.bfs_txflags |=
|
|
bf_first->bf_state.bfs_txflags &
|
|
(HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
|
|
|
|
/*
|
|
* If the packet has a sequence number, do not
|
|
* step outside of the block-ack window.
|
|
*/
|
|
if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
|
|
SEQNO(bf->bf_state.bfs_seqno))) {
|
|
status = ATH_AGGR_BAW_CLOSED;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* this packet is part of an aggregate.
|
|
*/
|
|
ATH_TID_REMOVE(tid, bf, bf_list);
|
|
|
|
/* The TID lock is required for the BAW update */
|
|
ath_tx_addto_baw(sc, an, tid, bf);
|
|
bf->bf_state.bfs_addedbaw = 1;
|
|
|
|
/*
|
|
* XXX enforce ACK for aggregate frames (this needs to be
|
|
* XXX handled more gracefully?
|
|
*/
|
|
if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
|
|
device_printf(sc->sc_dev,
|
|
"%s: HAL_TXDESC_NOACK set for an aggregate frame?\n",
|
|
__func__);
|
|
bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK);
|
|
}
|
|
|
|
/*
|
|
* Add the now owned buffer (which isn't
|
|
* on the software TXQ any longer) to our
|
|
* aggregate frame list.
|
|
*/
|
|
TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
|
|
nframes ++;
|
|
|
|
/* Completion handler */
|
|
bf->bf_comp = ath_tx_aggr_comp;
|
|
|
|
/*
|
|
* add padding for previous frame to aggregation length
|
|
*/
|
|
al += bpad + al_delta;
|
|
|
|
/*
|
|
* Calculate delimiters needed for the current frame
|
|
*/
|
|
bf->bf_state.bfs_ndelim =
|
|
ath_compute_num_delims(sc, bf_first,
|
|
bf->bf_state.bfs_pktlen);
|
|
|
|
/*
|
|
* Calculate the padding needed from this set of delimiters,
|
|
* used when calculating if the next frame will fit in
|
|
* the aggregate.
|
|
*/
|
|
bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2);
|
|
|
|
/*
|
|
* Chain the buffers together
|
|
*/
|
|
if (bf_prev)
|
|
bf_prev->bf_next = bf;
|
|
bf_prev = bf;
|
|
|
|
/*
|
|
* XXX TODO: if any sub-frames have RTS/CTS enabled;
|
|
* enable it for the entire aggregate.
|
|
*/
|
|
|
|
#if 0
|
|
/*
|
|
* terminate aggregation on a small packet boundary
|
|
*/
|
|
if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) {
|
|
status = ATH_AGGR_SHORTPKT;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
}
|
|
|
|
finish:
|
|
/*
|
|
* Just in case the list was empty when we tried to
|
|
* dequeue a packet ..
|
|
*/
|
|
if (bf_first) {
|
|
bf_first->bf_state.bfs_al = al;
|
|
bf_first->bf_state.bfs_nframes = nframes;
|
|
}
|
|
return status;
|
|
}
|