staging: wfx: keys are kept during whole firmware life

Keys sent to the firmware are never reset. So, it is not necessary to
re-upload them after hif_reset(). Thus, it is no more necessary to keep
a copy of the keys in struct wfx_dev.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200420160311.57323-12-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/key.c

@@ -21,14 +21,12 @@ static int wfx_alloc_key(struct wfx_dev *wdev)
 		return -1;
 
 	wdev->key_map |= BIT(idx);
-	wdev->keys[idx].entry_index = idx;
 	return idx;
 }
 
 static void wfx_free_key(struct wfx_dev *wdev, int idx)
 {
 	WARN(!(wdev->key_map & BIT(idx)), "inconsistent key allocation");
-	memset(&wdev->keys[idx], 0, sizeof(wdev->keys[idx]));
 	wdev->key_map &= ~BIT(idx);
 }
 
@@ -160,7 +158,7 @@ static int wfx_add_key(struct wfx_vif *wvif, struct ieee80211_sta *sta,
 		       struct ieee80211_key_conf *key)
 {
 	int ret;
-	struct hif_req_add_key *k;
+	struct hif_req_add_key k = { };
 	struct ieee80211_key_seq seq;
 	struct wfx_dev *wdev = wvif->wdev;
 	int idx = wfx_alloc_key(wvif->wdev);
@@ -170,44 +168,44 @@ static int wfx_add_key(struct wfx_vif *wvif, struct ieee80211_sta *sta,
 	ieee80211_get_key_rx_seq(key, 0, &seq);
 	if (idx < 0)
 		return -EINVAL;
-	k = &wdev->keys[idx];
-	k->int_id = wvif->id;
+	k.int_id = wvif->id;
+	k.entry_index = idx;
 	if (key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
 	    key->cipher ==  WLAN_CIPHER_SUITE_WEP104) {
 		if (pairwise)
-			k->type = fill_wep_pair(&k->key.wep_pairwise_key, key,
-						sta->addr);
+			k.type = fill_wep_pair(&k.key.wep_pairwise_key, key,
+					       sta->addr);
 		else
-			k->type = fill_wep_group(&k->key.wep_group_key, key);
+			k.type = fill_wep_group(&k.key.wep_group_key, key);
 	} else if (key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 		if (pairwise)
-			k->type = fill_tkip_pair(&k->key.tkip_pairwise_key, key,
-						 sta->addr);
+			k.type = fill_tkip_pair(&k.key.tkip_pairwise_key, key,
+						sta->addr);
 		else
-			k->type = fill_tkip_group(&k->key.tkip_group_key, key,
-						  &seq, wvif->vif->type);
+			k.type = fill_tkip_group(&k.key.tkip_group_key, key,
+						 &seq, wvif->vif->type);
 	} else if (key->cipher == WLAN_CIPHER_SUITE_CCMP) {
 		if (pairwise)
-			k->type = fill_ccmp_pair(&k->key.aes_pairwise_key, key,
-						 sta->addr);
+			k.type = fill_ccmp_pair(&k.key.aes_pairwise_key, key,
+						sta->addr);
 		else
-			k->type = fill_ccmp_group(&k->key.aes_group_key, key,
-						  &seq);
+			k.type = fill_ccmp_group(&k.key.aes_group_key, key,
+						 &seq);
 	} else if (key->cipher ==  WLAN_CIPHER_SUITE_SMS4) {
 		if (pairwise)
-			k->type = fill_sms4_pair(&k->key.wapi_pairwise_key, key,
-						 sta->addr);
+			k.type = fill_sms4_pair(&k.key.wapi_pairwise_key, key,
+						sta->addr);
 		else
-			k->type = fill_sms4_group(&k->key.wapi_group_key, key);
+			k.type = fill_sms4_group(&k.key.wapi_group_key, key);
 	} else if (key->cipher ==  WLAN_CIPHER_SUITE_AES_CMAC) {
-		k->type = fill_aes_cmac_group(&k->key.igtk_group_key, key,
-					      &seq);
+		k.type = fill_aes_cmac_group(&k.key.igtk_group_key, key,
+					     &seq);
 	} else {
 		dev_warn(wdev->dev, "unsupported key type %d\n", key->cipher);
 		wfx_free_key(wdev, idx);
 		return -EOPNOTSUPP;
 	}
-	ret = hif_add_key(wdev, k);
+	ret = hif_add_key(wdev, &k);
 	if (ret) {
 		wfx_free_key(wdev, idx);
 		return -EOPNOTSUPP;
@@ -241,19 +239,3 @@ int wfx_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 	return ret;
 }
 
-int wfx_upload_keys(struct wfx_vif *wvif)
-{
-	int i;
-	struct hif_req_add_key *key;
-	struct wfx_dev *wdev = wvif->wdev;
-
-	for (i = 0; i < ARRAY_SIZE(wdev->keys); i++) {
-		if (wdev->key_map & BIT(i)) {
-			key = &wdev->keys[i];
-			if (key->int_id == wvif->id)
-				hif_add_key(wdev, key);
-		}
-	}
-	return 0;
-}
-

drivers/staging/wfx/key.h

@@ -16,6 +16,5 @@ struct wfx_vif;
 int wfx_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 		struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 		struct ieee80211_key_conf *key);
-int wfx_upload_keys(struct wfx_vif *wvif);
 
 #endif /* WFX_STA_H */

drivers/staging/wfx/sta.c

@@ -378,9 +378,6 @@ static void wfx_do_join(struct wfx_vif *wvif)
 		else
 			wvif->state = WFX_STATE_PRE_STA;
 
-		/* Upload keys */
-		wfx_upload_keys(wvif);
-
 		/* Due to beacon filtering it is possible that the
 		 * AP's beacon is not known for the mac80211 stack.
 		 * Disable filtering temporary to make sure the stack
@@ -457,7 +454,6 @@ int wfx_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
 	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
 
-	wfx_upload_keys(wvif);
 	wvif->state = WFX_STATE_AP;
 	wfx_upload_ap_templates(wvif);
 	hif_start(wvif, &vif->bss_conf, wvif->channel);

drivers/staging/wfx/wfx.h

@@ -56,7 +56,6 @@ struct wfx_dev {
 
 	atomic_t		packet_id;
 	u32			key_map;
-	struct hif_req_add_key	keys[MAX_KEY_ENTRIES];
 
 	struct hif_rx_stats	rx_stats;
 	struct mutex		rx_stats_lock;