The existing API only exposes 'seglen' (the current buffer (segment) length)
with the data buffer pointer set in 'ds_data'. This is fine for the legacy
DMA engine but it won't work for the EDMA engines.
The EDMA engine has a significantly different TX descriptor layout.
* The legacy DMA engine had a ds_data pointer at the same offset in the
descriptor for both TX and RX buffers;
* The EDMA engine has no ds_data for RX - the data is DMAed after the
descriptor;
* The EDMA engine has support for 4 TX buffer/segment pairs in the TX
DMA descriptor;
* The EDMA TX completion is in a different FIFO, and the driver will
'link' the status completion entry to a QCU by a "QCU ID".
I don't know why it's just not filled in by the hardware, alas.
So given that, here are the changes:
* Instead of directly fondling 'ds_data' in ath_desc, change the
ath_hal_filltxdesc() to take an array of buffer pointers as well
as segment len pointers;
* The EDMA TX completion status wants a descriptor and queue id.
This (for now) uses bf_state.bfs_txq and will extract the hardware QCU
ID from that.
* .. and this is ugly and wasteful; it should change to just store
the QCU in the bf_state and save 3/7 bytes in the process.
Now, the weird crap:
* The aggregate TX path was using bf_state->bfs_txq for the TXQ, rather than
taking a function argument. I've tidied that up.
* The multicast queue frames get put on a software TXQ and then that is
appended to the hardware CABQ when appropriate. So for now, make sure
that bf_state->bfs_txq points at the CABQ when adding frames to the
multicast queue.
* .. but the multicast queue TX path for now doesn't use the software
queue and instead
(a) directly sets up the descriptor contents at that point;
(b) the frames on the vap->avp_mcastq are then just appended wholesale
to the CABQ.
So for now, I don't have to worry about making the multicast path
work with aggregation or the per-TID software queue. Phew.
What's left to do:
* I need to modify the 11n ath_hal_chaintxdesc() API to do the same.
I'll do that in a subsequent commit.
* Remove bf_state.bfs_txq entirely and store the QCU as appropriate.
* .. then do the runtime "is this going on the right HWQ?" checks using
that, rather than comparing pointer values.
Tested on:
* AR9280 STA/AP
* AR5416 STA/AP
The DMA FIFO chips (AR93xx and later) differ slightly to th elegacy
chips:
* The RX DMA descriptors don't have a ds_link field;
* The TX DMA descriptors have a ds_link field however at a different
offset.
This is a reimplementation based on what the reference driver and ath9k
does.
A subsequent commit will enable it in the TX and beacon paths.
Obtained from: Linux ath9k, Qualcomm Atheros
rather than global variables.
This specifically allows for debugging to be enabled per-NIC, rather
than globally.
Since the ath driver doesn't know about AH_DEBUG, and to keep the ABI
consistent regardless of whether AH_DEBUG is enabled or not, enable the
debug parameter always but only conditionally compile in the debug
methods if needed.
The ALQ support is currently still global pending some brainstorming.
Submitted by: ssgriffonuser@gmail.com
Reviewed by: adrian, bschmidt
the completion schedule from the hardware and returns AH_TRUE if
the hardware supports multi-rate retries (AR5212 and above); and
returns AH_FALSE if the hardware doesn't support multi-rate retries.
The sample rate module directly reads the TX completion descriptor
and extracts the TX schedule information from that. It will be
updated in a future commit to instead use this method to determine
the completion schedule.
o remove HAL_CHANNEL; convert the hal to use net80211 channels; this
mostly involves mechanical changes to variable names and channel
attribute macros
o gut HAL_CHANNEL_PRIVATE as most of the contents are now redundant
with the net80211 channel available
o change api for ath_hal_init_channels: no more reglass id's, no more outdoor
indication (was a noop), anM contents
o add ath_hal_getchannels to have the hal construct a channel list without
altering runtime state; this is used to retrieve the calibration list for
the device in ath_getradiocaps
o add ath_hal_set_channels to take a channel list and regulatory data from
above and construct internal state to match (maps frequencies for 900MHz
cards, setup for CTL lookups, etc)
o compact the private channel table: we keep one private channel
per frequency instead of one per HAL_CHANNEL; this gives a big
space savings and potentially improves ani and calibration by
sharing state (to be seen; didn't see anything in testing); a new config
option AH_MAXCHAN controls the table size (default to 96 which
was chosen to be ~3x the largest expected size)
o shrink ani state and change to mirror private channel table (one entry per
frequency indexed by ic_devdata)
o move ani state flags to private channel state
o remove country codes; use net80211 definitions instead
o remove GSM regulatory support; it's no longer needed now that we
pass in channel lists from above
o consolidate ADHOC_NO_11A attribute with DISALLOW_ADHOC_11A
o simplify initial channel list construction based on the EEPROM contents;
we preserve country code support for now but may want to just fallback
to a WWR sku and dispatch the discovered country code up to user space
so the channel list can be constructed using the master regdomain tables
o defer to net80211 for max antenna gain
o eliminate sorting of internal channel table; now that we use ic_devdata
as an index, table lookups are O(1)
o remove internal copy of the country code; the public one is sufficient
o remove AH_SUPPORT_11D conditional compilation; we always support 11d
o remove ath_hal_ispublicsafetysku; not needed any more
o remove ath_hal_isgsmsku; no more GSM stuff
o move Conformance Test Limit (CTL) state from private channel to a lookup
using per-band pointers cached in the private state block
o remove regulatory class id support; was unused and belongs in net80211
o fix channel list construction to set IEEE80211_CHAN_NOADHOC,
IEEE80211_CHAN_NOHOSTAP, and IEEE80211_CHAN_4MSXMIT
o remove private channel flags CHANNEL_DFS and CHANNEL_4MS_LIMIT; these are
now set in the constructed net80211 channel
o store CHANNEL_NFCREQUIRED (Noise Floor Required) channel attribute in one
of the driver-private flag bits of the net80211 channel
o move 900MHz frequency mapping into the hal; the mapped frequency is stored
in the private channel and used throughout the hal (no more mapping in the
driver and/or net80211)
o remove ath_hal_mhz2ieee; it's no longer needed as net80211 does the
calculation and available in the net80211 channel
o change noise floor calibration logic to work with compacted private channel
table setup; this may require revisiting as we no longer can distinguish
channel attributes (e.g. 11b vs 11g vs turbo) but since the data is used
only to calculate status data we can live with it for now
o change ah_getChipPowerLimits internal method to operate on a single channel
instead of all channels in the private channel table
o add ath_hal_gethwchannel to map a net80211 channel to a h/w frequency
(always the same except for 900MHz channels)
o add HAL_EEBADREG and HAL_EEBADCC status codes to better identify regulatory
problems
o remove CTRY_DEBUG and CTRY_DEFAULT enum's; these come from net80211 now
o change ath_hal_getwirelessmodes to really return wireless modes supported
by the hardware (was previously applying regulatory constraints)
o return channel interference status with IEEE80211_CHANSTATE_CWINT (should
change to a callback so hal api's can take const pointers)
o remove some #define's no longer needed with the inclusion of
<net80211/_ieee80211.h>
Sponsored by: Carlson Wireless
