From 92f78d4b15a40f6b055be73bbecc2e79b10638f0 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Sat, 25 Apr 2020 13:04:50 +0300
Subject: [PATCH] iwlwifi: mvm: attempt to allocate smaller queues
Git-commit: 92f78d4b15a40f6b055be73bbecc2e79b10638f0
Patch-mainline: v5.8-rc1
References: jsc#SLE-13430

We currently attempt to allocate queues that are 512 entries long,
but that requires 32 KiB memory, which may not be available, at
least not contiguously. If we fail to allocate, attempt to use a
smaller queue all the way down to 16 entries (which fit into a
single page).

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20200425130140.c8548d7cc08a.I5059c410e628726cbce98d6311b690c632d00f97@changeid
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index ca5dcd7643e0..b36aef1d61b0 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -749,16 +749,23 @@ static int iwl_mvm_tvqm_enable_txq(struct iwl_mvm *mvm,
 		size = max_t(u32, IWL_MGMT_QUEUE_SIZE,
 			     mvm->trans->cfg->min_txq_size);
 	}
-	queue = iwl_trans_txq_alloc(mvm->trans,
-				    cpu_to_le16(TX_QUEUE_CFG_ENABLE_QUEUE),
-				    sta_id, tid, SCD_QUEUE_CFG, size, timeout);
 
-	if (queue < 0) {
-		IWL_DEBUG_TX_QUEUES(mvm,
-				    "Failed allocating TXQ for sta %d tid %d, ret: %d\n",
-				    sta_id, tid, queue);
+	do {
+		__le16 enable = cpu_to_le16(TX_QUEUE_CFG_ENABLE_QUEUE);
+
+		queue = iwl_trans_txq_alloc(mvm->trans, enable,
+					    sta_id, tid, SCD_QUEUE_CFG,
+					    size, timeout);
+
+		if (queue < 0)
+			IWL_DEBUG_TX_QUEUES(mvm,
+					    "Failed allocating TXQ of size %d for sta %d tid %d, ret: %d\n",
+					    size, sta_id, tid, queue);
+		size /= 2;
+	} while (queue < 0 && size >= 16);
+
+	if (queue < 0)
 		return queue;
-	}
 
 	IWL_DEBUG_TX_QUEUES(mvm, "Enabling TXQ #%d for sta %d tid %d\n",
 			    queue, sta_id, tid);
-- 
2.16.4