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[802.11] Enhance support for driver PHY differences
The prior net80211 model of physical-layer behavior for drivers was overly simplistic and limited the drivers that could be written. To be more flexible, split the driver-provided list of supported rates by band, and add a means for specifying a list of supported channels. Allow drivers to specify a hardware channel value that will be tied to uses of the channel. Expose net80211_duration() to drivers, and make the rate it uses in its computations configurable, so that it can be used in calculating durations that must be set in hardware for ACK and CTS packets. Add net80211_cts_duration() for the common case of calculating the duration for a CTS packet. Signed-off-by: Michael Brown <mcb30@etherboot.org>
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