Andriy Voskoboinyk 9dba612805 rtwn_usb: add support for fragmented Rx.
Since device can pass multiple frames in a single payload temporary
Rx buffer was big enough to hold all of them; now the driver can
concatenate a single frame from multiple payloads.

The Rx buffer size may be configured via tunable (dev.rtwn.%d.rx_buf_size).

Tested with:
 - rtl8188cus, rtl8188eu and rtl8821au (STA mode).
 - (by kevlo) rtl8192cu and rtl8188eu.

PR:		218527
Reviewed by:	kevlo
Differential Revision:	https://reviews.freebsd.org/D11705
2017-07-30 23:35:21 +00:00
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