This is a note to let you know that I've just added the patch titled
wifi: iwlwifi: disable multi rx queue for 9000
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-iwlwifi-disable-multi-rx-queue-for-9000.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4a8f79988f9ef2452a139c0cdb6bb447d30e602a
Author: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Date: Tue Oct 17 12:16:46 2023 +0300
wifi: iwlwifi: disable multi rx queue for 9000
[ Upstream commit 29fa9a984b6d1075020f12071a89897fd62ed27f ]
Multi rx queue allows to spread the load of the Rx streams on different
CPUs. 9000 series required complex synchronization mechanisms from the
driver side since the hardware / firmware is not able to provide
information about duplicate packets and timeouts inside the reordering
buffer.
Users have complained that for newer devices, all those synchronization
mechanisms have caused spurious packet drops. Those packet drops
disappeared if we simplify the code, but unfortunately, we can't have
RSS enabled on 9000 series without this complex code.
Remove support for RSS on 9000 so that we can make the code much simpler
for newer devices and fix the bugs for them.
The down side of this patch is a that all the Rx path will be routed to
a single CPU, but this has never been an issue, the modern CPUs are just
fast enough to cope with all the traffic.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Gregory Greenman <gregory.greenman@xxxxxxxxx>
Link: https://lore.kernel.org/r/20231017115047.2917eb8b7af9.Iddd7dcf335387ba46fcbbb6067ef4ff9cd3755a7@changeid
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Stable-dep-of: e78d78773089 ("wifi: iwlwifi: mvm: include link ID when releasing frames")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
index 168eda2132fb8..9dcc1506bd0b0 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
@@ -278,7 +278,7 @@ static inline void iwl_free_rxb(struct iwl_rx_cmd_buffer *r)
#define IWL_MGMT_TID 15
#define IWL_FRAME_LIMIT 64
#define IWL_MAX_RX_HW_QUEUES 16
-#define IWL_9000_MAX_RX_HW_QUEUES 6
+#define IWL_9000_MAX_RX_HW_QUEUES 1
/**
* enum iwl_wowlan_status - WoWLAN image/device status
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index aaa9840d0d4c5..ee9d14250a261 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -352,7 +352,9 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
ieee80211_hw_set(hw, HAS_RATE_CONTROL);
}
- if (iwl_mvm_has_new_rx_api(mvm))
+ /* We want to use the mac80211's reorder buffer for 9000 */
+ if (iwl_mvm_has_new_rx_api(mvm) &&
+ mvm->trans->trans_cfg->device_family > IWL_DEVICE_FAMILY_9000)
ieee80211_hw_set(hw, SUPPORTS_REORDERING_BUFFER);
if (fw_has_capa(&mvm->fw->ucode_capa,
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index bac0228b8c866..92b3e18dbe877 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -963,6 +963,9 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
IWL_RX_MPDU_REORDER_BAID_SHIFT;
+ if (mvm->trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_9000)
+ return false;
+
/*
* This also covers the case of receiving a Block Ack Request
* outside a BA session; we'll pass it to mac80211 and that
@@ -2621,9 +2624,15 @@ void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc) &&
likely(!iwl_mvm_time_sync_frame(mvm, skb, hdr->addr2)) &&
- likely(!iwl_mvm_mei_filter_scan(mvm, skb)))
+ likely(!iwl_mvm_mei_filter_scan(mvm, skb))) {
+ if (mvm->trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_9000 &&
+ (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
+ !(desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME))
+ rx_status->flag |= RX_FLAG_AMSDU_MORE;
+
iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta,
link_sta);
+ }
out:
rcu_read_unlock();
}
