Hi,
While investigating bug 60713[1] which is about the inability to connect
with RTL8192CE hardware, I noticed that the monitor mode only shows
broadcast and multicast frames. The cause is described next.
`rtlpci->receive_config` seems to contain the current value of REG_RCR.
It gets initialized in rtl*_init_sw_vars. It is returned by
rtl*_get_hw_reg and set by rtl*_set_hw_reg (after writing to REG_RCR).
`mac->rx_conf` is initialized in rtl_init_rx_config. For PCIe drivers,
it gets inited from `receive_config` via get_hw_reg (one of the
functions from the previous section).
When monitor mode is enabled with otherbss set, rtl_op_configure_filter
is called. This has a problem:
(1) The rtl_op_configure_filter function only sets mac->rx_conf.
(2) rx_conf is only written to register REG_RCR by rtl8192cu and besides
that driver, it is only read by rtl_init_rx_config in base.c.
Patch 2/3 fixes the above issue. 1/2 makes accessing RCR more consistent
and 3/3 removes unused functions (yay, less code!). Similar
modifications (3 and probably 1) need to be done for staging.
I have tested these patches on top of v3.14-rc2-267-g9398a10, but it
unfortunately does not improve the connectivity problem. It got even
stranger, when I run `iw wlan0 set monitor fcsfail`, I do not see a
"Enable receive FCS error frame" message with debug=5. Instead I see
"Enable receive control frame". More testing will be done later this
day. For example, only the first and second EAPOL frame of a second test
device got captured, others got lost somehow. Hopefully it is not a
memory corruption issue somewhere.
Related question for a Realtek engineer (or someone with access to the
specs): the rx_ctrl_filter and rx_data_filter fields are only *read* in
the rtl8192cu driver. Besides that they are unused. Can this be removed?
Otherwise, what about moving them to rtl_init_rx_config() and updating
the *_get_hw_reg() functions to ignore/process the vars? After doing so,
_update_mac_setting can be removed from rtl8192cu/hw.c.
Regards,
Peter
[1]: https://bugzilla.kernel.org/show_bug.cgi?id=60713
---
Peter Wu (3):
rtlwifi: avoid accessing RCR directly
rtlwifi: properly apply filter flags
rtlwifi: remove unused allow_all_destaddr functions
drivers/net/wireless/rtlwifi/core.c | 52 +++++++++++++++++------------
drivers/net/wireless/rtlwifi/rtl8188ee/hw.c | 25 ++------------
drivers/net/wireless/rtlwifi/rtl8188ee/hw.h | 2 --
drivers/net/wireless/rtlwifi/rtl8188ee/sw.c | 1 -
drivers/net/wireless/rtlwifi/rtl8192ce/hw.c | 25 ++------------
drivers/net/wireless/rtlwifi/rtl8192ce/hw.h | 2 --
drivers/net/wireless/rtlwifi/rtl8192ce/sw.c | 1 -
drivers/net/wireless/rtlwifi/rtl8192cu/hw.c | 4 ++-
drivers/net/wireless/rtlwifi/rtl8192de/hw.c | 6 ++--
drivers/net/wireless/rtlwifi/rtl8192se/hw.c | 25 ++------------
drivers/net/wireless/rtlwifi/rtl8192se/hw.h | 2 --
drivers/net/wireless/rtlwifi/rtl8192se/sw.c | 1 -
drivers/net/wireless/rtlwifi/rtl8723ae/hw.c | 26 ++-------------
drivers/net/wireless/rtlwifi/rtl8723ae/hw.h | 2 --
drivers/net/wireless/rtlwifi/rtl8723ae/sw.c | 1 -
drivers/net/wireless/rtlwifi/wifi.h | 2 --
16 files changed, 49 insertions(+), 128 deletions(-)
--
1.8.5.4
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