linux-kernel - [PATCH v2 01/55] staging: wfx: fix the cache of rate policies on interface reset

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Date:   Tue, 17 Dec 2019 16:14:27 +0000
From:   Jérôme Pouiller <Jerome.Pouiller@...abs.com>
To:     "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jérôme Pouiller <Jerome.Pouiller@...abs.com>
Subject: [PATCH v2 01/55] staging: wfx: fix the cache of rate policies on
 interface reset

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

Device and driver maintain a cache of rate policies (aka.
tx_retry_policy in hardware API).

When hif_reset() is sent to hardware, device resets its cache of rate
policies. In order to keep driver in sync, it is necessary to do the
same on driver.

Note, when driver tries to use a rate policy that has not been defined
on device, data is sent at 1Mbps. So, this patch should fix abnormal
throughput observed sometime after a reset of the interface.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/data_tx.c | 3 +--
 drivers/staging/wfx/data_tx.h | 1 +
 drivers/staging/wfx/sta.c     | 6 +++++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/wfx/data_tx.c b/drivers/staging/wfx/data_tx.c
index b722e9773232..02f001dab62b 100644
--- a/drivers/staging/wfx/data_tx.c
+++ b/drivers/staging/wfx/data_tx.c
@@ -249,7 +249,7 @@ static int wfx_tx_policy_upload(struct wfx_vif *wvif)
 	return 0;
 }
 
-static void wfx_tx_policy_upload_work(struct work_struct *work)
+void wfx_tx_policy_upload_work(struct work_struct *work)
 {
 	struct wfx_vif *wvif =
 		container_of(work, struct wfx_vif, tx_policy_upload_work);
@@ -270,7 +270,6 @@ void wfx_tx_policy_init(struct wfx_vif *wvif)
 	spin_lock_init(&cache->lock);
 	INIT_LIST_HEAD(&cache->used);
 	INIT_LIST_HEAD(&cache->free);
-	INIT_WORK(&wvif->tx_policy_upload_work, wfx_tx_policy_upload_work);
 
 	for (i = 0; i < HIF_MIB_NUM_TX_RATE_RETRY_POLICIES; ++i)
 		list_add(&cache->cache[i].link, &cache->free);
diff --git a/drivers/staging/wfx/data_tx.h b/drivers/staging/wfx/data_tx.h
index 29faa5640516..a0f9ae69baf5 100644
--- a/drivers/staging/wfx/data_tx.h
+++ b/drivers/staging/wfx/data_tx.h
@@ -61,6 +61,7 @@ struct wfx_tx_priv {
 } __packed;
 
 void wfx_tx_policy_init(struct wfx_vif *wvif);
+void wfx_tx_policy_upload_work(struct work_struct *work);
 
 void wfx_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control,
 	    struct sk_buff *skb);
diff --git a/drivers/staging/wfx/sta.c b/drivers/staging/wfx/sta.c
index 29848a202ab4..471dd15b227f 100644
--- a/drivers/staging/wfx/sta.c
+++ b/drivers/staging/wfx/sta.c
@@ -592,6 +592,7 @@ static void wfx_do_unjoin(struct wfx_vif *wvif)
 	wfx_tx_flush(wvif->wdev);
 	hif_keep_alive_period(wvif, 0);
 	hif_reset(wvif, false);
+	wfx_tx_policy_init(wvif);
 	hif_set_output_power(wvif, wvif->wdev->output_power * 10);
 	wvif->dtim_period = 0;
 	hif_set_macaddr(wvif, wvif->vif->addr);
@@ -880,8 +881,10 @@ static int wfx_update_beaconing(struct wfx_vif *wvif)
 		if (wvif->state != WFX_STATE_AP ||
 		    wvif->beacon_int != conf->beacon_int) {
 			wfx_tx_lock_flush(wvif->wdev);
-			if (wvif->state != WFX_STATE_PASSIVE)
+			if (wvif->state != WFX_STATE_PASSIVE) {
 				hif_reset(wvif, false);
+				wfx_tx_policy_init(wvif);
+			}
 			wvif->state = WFX_STATE_PASSIVE;
 			wfx_start_ap(wvif);
 			wfx_tx_unlock(wvif->wdev);
@@ -1567,6 +1570,7 @@ int wfx_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	INIT_WORK(&wvif->set_cts_work, wfx_set_cts_work);
 	INIT_WORK(&wvif->unjoin_work, wfx_unjoin_work);
 
+	INIT_WORK(&wvif->tx_policy_upload_work, wfx_tx_policy_upload_work);
 	mutex_unlock(&wdev->conf_mutex);
 
 	hif_set_macaddr(wvif, vif->addr);
-- 
2.24.0