[Bug 218527] [rtwn] Constantly packet dropping and connection loss

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218527

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: avos
Date: Sun Jul 30 23:35:21 UTC 2017
New revision: 321735
URL: https://svnweb.freebsd.org/changeset/base/321735

Log:
  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

Changes:
  head/sys/dev/rtwn/if_rtwnreg.h
  head/sys/dev/rtwn/usb/rtwn_usb_attach.c
  head/sys/dev/rtwn/usb/rtwn_usb_ep.c
  head/sys/dev/rtwn/usb/rtwn_usb_rx.c
  head/sys/dev/rtwn/usb/rtwn_usb_var.h

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