[PATCH 5.4 172/203] iwlwifi: mvm: consider ieee80211 station max amsdu value

Greg Kroah-Hartman
2020-01-16T23:42:44Z

From: Mordechay Goodstein <mordechay.goodstein@intel.com>

commit ee4cce9b9d6421d037ffc002536b918fd7f4aff3 upstream.

debugfs amsdu_len sets only the max_amsdu_len for ieee80211 station
so take it into consideration while getting max amsdu

Fixes: af2984e9e625 ("iwlwifi: mvm: add a debugfs entry to set a fixed size AMSDU for all TX packets")
Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/wireless/intel/iwlwifi/mvm/rs-fw.c | 8 +++++++-
drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 7 ++++++-
2 files changed, 13 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs-fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs-fw.c
@@ -350,7 +350,13 @@ void iwl_mvm_tlc_update_notif(struct iwl
u16 size = le32_to_cpu(notif->amsdu_size);
int i;

- if (WARN_ON(sta->max_amsdu_len < size))
+ /*
+ * In debug sta->max_amsdu_len < size
+ * so also check with orig_amsdu_len which holds the original
+ * data before debugfs changed the value
+ */
+ if (WARN_ON(sta->max_amsdu_len < size &&
+ mvmsta->orig_amsdu_len < size))
goto out;

mvmsta->amsdu_enabled = le32_to_cpu(notif->amsdu_enabled);
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
@@ -935,7 +935,12 @@ static int iwl_mvm_tx_tso(struct iwl_mvm
!(mvmsta->amsdu_enabled & BIT(tid)))
return iwl_mvm_tx_tso_segment(skb, 1, netdev_flags, mpdus_skb);

- max_amsdu_len = iwl_mvm_max_amsdu_size(mvm, sta, tid);
+ /*
+ * Take the min of ieee80211 station and mvm station
+ */
+ max_amsdu_len =
+ min_t(unsigned int, sta->max_amsdu_len,
+ iwl_mvm_max_amsdu_size(mvm, sta, tid));

/*
* Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not