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Re: [PATCH 5/6] wifi: mt76: mt7915: Improve monitor-mode flags settings.

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On 4/28/23 14:48, Ryder Lee wrote:
On Fri, 2023-04-28 at 13:49 -0700, greearb@xxxxxxxxxxxxxxx wrote:
External email : Please do not click links or open attachments until
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From: Ben Greear <greearb@xxxxxxxxxxxxxxx>

This enables capturing more frames, and now when the rx5 group
option is also enabled for rx-status, wireshark shows HE-TRIG
as well as HE-MU frames.

Signed-off-by: Ben Greear <greearb@xxxxxxxxxxxxxxx>
---
  .../net/wireless/mediatek/mt76/mt7915/main.c  | 26
+++++++++++++++++--
  .../net/wireless/mediatek/mt76/mt7915/regs.h  | 16 ++++++++++++
  2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/main.c
b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
index 64c14fc303a2..55aed3c6d3be 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
@@ -562,6 +562,12 @@ static void __mt7915_configure_filter(struct
ieee80211_hw *hw,
                         MT_WF_RFCR1_DROP_BF_POLL |
                         MT_WF_RFCR1_DROP_BA |
                         MT_WF_RFCR1_DROP_CFEND |
+                       MT_WF_RFCR1_DROP_PS_BFRPOL |
+                       MT_WF_RFCR1_DROP_PS_NDPA |
+                       MT_WF_RFCR1_DROP_NO2ME_TF |
+                       MT_WF_RFCR1_DROP_NON_MUBAR_TF |
+                       MT_WF_RFCR1_DROP_RXS_BRP |
+                       MT_WF_RFCR1_DROP_TF_BFRP |
                         MT_WF_RFCR1_DROP_CFACK;
         u32 flags = 0;
         bool is_promisc = *total_flags & FIF_CONTROL || phy-
monitor_vif ||
@@ -587,7 +593,9 @@ static void __mt7915_configure_filter(struct
ieee80211_hw *hw,
                            MT_WF_RFCR_DROP_BCAST |
                            MT_WF_RFCR_DROP_DUPLICATE |
                            MT_WF_RFCR_DROP_A2_BSSID |
-                          MT_WF_RFCR_DROP_UNWANTED_CTL |
+                          MT_WF_RFCR_DROP_UNWANTED_CTL | /* 0 means
drop */
+                          MT_WF_RFCR_IND_FILTER_EN_OF_31_23_BIT |
+                          MT_WF_RFCR_DROP_DIFFBSSIDMGT_CTRL |
                            MT_WF_RFCR_DROP_STBC_MULTI);

         phy->rxfilter |= MT_WF_RFCR_DROP_OTHER_UC;
@@ -602,8 +610,22 @@ static void __mt7915_configure_filter(struct
ieee80211_hw *hw,
                              MT_WF_RFCR_DROP_RTS |
                              MT_WF_RFCR_DROP_CTL_RSV |
                              MT_WF_RFCR_DROP_NDPA);
-       if (is_promisc)
+       if (is_promisc) {
                 phy->rxfilter &= ~MT_WF_RFCR_DROP_OTHER_UC;
+               phy->rxfilter |=
MT_WF_RFCR_IND_FILTER_EN_OF_31_23_BIT;
+               if (flags & FIF_CONTROL) {
+                       phy->rxfilter |=
MT_WF_RFCR_DROP_UNWANTED_CTL; /* 1 means receive */
+                       phy->rxfilter |= MT_WF_RFCR_SECOND_BCN_EN;
+                       phy->rxfilter |=
MT_WF_RFCR_RX_MGMT_FRAME_CTRL;
+                       phy->rxfilter |=
MT_WF_RFCR_RX_SAMEBSSIDPRORESP_CTRL;
+                       phy->rxfilter |=
MT_WF_RFCR_RX_DIFFBSSIDPRORESP_CTRL;
+                       phy->rxfilter |=
MT_WF_RFCR_RX_SAMEBSSIDBCN_CTRL;
+                       phy->rxfilter |=
MT_WF_RFCR_RX_SAMEBSSIDNULL_CTRL;
+                       phy->rxfilter |=
MT_WF_RFCR_RX_DIFFBSSIDNULL_CTRL;
+                       phy->rxfilter &=
~(MT_WF_RFCR_DROP_DIFFBSSIDMGT_CTRL);

FIF_CONTROL: pass control frame. However, many of these are not control
frames. I think we should move monitor dedicated misc parts to
IEEE80211_CONF_CHANGE_MONITOR mt7915_set_monitor and leave this
function as-is ... as my reply in [2/6].

My understanding is that the rxfilter and related phy fields should take all settings and vdevs into account.
So if monitor mode is enabled, and another sta/ap vdev exists, and someone takes any action that causes
the stack to call the set_filter() logic on the sta/vdev, then set_filter must know about the monitor port to
do the right thing.  This is why mt7915_configure_filter should handle everything and be aware of
monitor port existing or not.

Thanks,
Ben

--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com





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