wil6210: accessing 802.3 addresses via utility functions

Rearrange the code by having functions to access 802.3 header
members, source and destination addresses.
Signed-off-by: Ahmad Masri <amasri@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/wil6210/txrx.c

@@ -383,7 +383,6 @@ static int wil_rx_get_cid_by_skb(struct wil6210_priv *wil, struct sk_buff *skb)
 	 */
 	int cid = wil_rxdesc_cid(d);
 	unsigned int snaplen = wil_rx_snaplen();
-	struct ethhdr *eth;
 	struct ieee80211_hdr_3addr *hdr;
 	int i;
 	unsigned char *ta;
@@ -401,8 +400,7 @@ static int wil_rx_get_cid_by_skb(struct wil6210_priv *wil, struct sk_buff *skb)
 					    skb->len);
 			return -ENOENT;
 		}
-		eth = (void *)skb->data;
-		ta = eth->h_source;
+		ta = wil_skb_get_sa(skb);
 	} else {
 		if (unlikely(skb->len < sizeof(struct ieee80211_hdr_3addr))) {
 			wil_err_ratelimited(wil, "Short frame, len = %d\n",
@@ -739,11 +737,11 @@ void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
 	unsigned int len = skb->len;
 	int cid;
 	int security;
-	struct ethhdr *eth = (void *)skb->data;
+	u8 *sa, *da = wil_skb_get_da(skb);
 	/* here looking for DA, not A1, thus Rxdesc's 'mcast' indication
 	 * is not suitable, need to look at data
 	 */
-	int mcast = is_multicast_ether_addr(eth->h_dest);
+	int mcast = is_multicast_ether_addr(da);
 	struct wil_net_stats *stats;
 	struct sk_buff *xmit_skb = NULL;
 	static const char * const gro_res_str[] = {
@@ -774,7 +772,8 @@ void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
 	}
 
 	if (wdev->iftype == NL80211_IFTYPE_STATION) {
-		if (mcast && ether_addr_equal(eth->h_source, ndev->dev_addr)) {
+		sa = wil_skb_get_sa(skb);
+		if (mcast && ether_addr_equal(sa, ndev->dev_addr)) {
 			/* mcast packet looped back to us */
 			rc = GRO_DROP;
 			dev_kfree_skb(skb);
@@ -787,8 +786,7 @@ void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
 			 */
 			xmit_skb = skb_copy(skb, GFP_ATOMIC);
 		} else {
-			int xmit_cid = wil_find_cid(wil, vif->mid,
-						    eth->h_dest);
+			int xmit_cid = wil_find_cid(wil, vif->mid, da);
 
 			if (xmit_cid >= 0) {
 				/* The destination station is associated to
@@ -1239,11 +1237,12 @@ static struct wil_ring *wil_find_tx_ucast(struct wil6210_priv *wil,
 					  struct wil6210_vif *vif,
 					  struct sk_buff *skb)
 {
-	int i;
-	struct ethhdr *eth = (void *)skb->data;
-	int cid = wil_find_cid(wil, vif->mid, eth->h_dest);
+	int i, cid;
+	const u8 *da = wil_skb_get_da(skb);
 	int min_ring_id = wil_get_min_tx_ring_id(wil);
 
+	cid = wil_find_cid(wil, vif->mid, da);
+
 	if (cid < 0 || cid >= max_assoc_sta)
 		return NULL;
 
@@ -1257,7 +1256,7 @@ static struct wil_ring *wil_find_tx_ucast(struct wil6210_priv *wil,
 			struct wil_ring_tx_data *txdata = &wil->ring_tx_data[i];
 
 			wil_dbg_txrx(wil, "find_tx_ucast: (%pM) -> [%d]\n",
-				     eth->h_dest, i);
+				     da, i);
 			if (v->va && txdata->enabled) {
 				return v;
 			} else {
@@ -1348,10 +1347,10 @@ static struct wil_ring *wil_find_tx_bcast_1(struct wil6210_priv *wil,
 static void wil_set_da_for_vring(struct wil6210_priv *wil,
 				 struct sk_buff *skb, int vring_index)
 {
-	struct ethhdr *eth = (void *)skb->data;
+	u8 *da = wil_skb_get_da(skb);
 	int cid = wil->ring2cid_tid[vring_index][0];
 
-	ether_addr_copy(eth->h_dest, wil->sta[cid].addr);
+	ether_addr_copy(da, wil->sta[cid].addr);
 }
 
 static struct wil_ring *wil_find_tx_bcast_2(struct wil6210_priv *wil,
@@ -1362,8 +1361,7 @@ static struct wil_ring *wil_find_tx_bcast_2(struct wil6210_priv *wil,
 	struct sk_buff *skb2;
 	int i;
 	u8 cid;
-	struct ethhdr *eth = (void *)skb->data;
-	char *src = eth->h_source;
+	const u8 *src = wil_skb_get_sa(skb);
 	struct wil_ring_tx_data *txdata, *txdata2;
 	int min_ring_id = wil_get_min_tx_ring_id(wil);
 
@@ -2121,8 +2119,8 @@ netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 {
 	struct wil6210_vif *vif = ndev_to_vif(ndev);
 	struct wil6210_priv *wil = vif_to_wil(vif);
-	struct ethhdr *eth = (void *)skb->data;
-	bool bcast = is_multicast_ether_addr(eth->h_dest);
+	const u8 *da = wil_skb_get_da(skb);
+	bool bcast = is_multicast_ether_addr(da);
 	struct wil_ring *ring;
 	static bool pr_once_fw;
 	int rc;
@@ -2169,7 +2167,7 @@ netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 		ring = wil_find_tx_ucast(wil, vif, skb);
 	}
 	if (unlikely(!ring)) {
-		wil_dbg_txrx(wil, "No Tx RING found for %pM\n", eth->h_dest);
+		wil_dbg_txrx(wil, "No Tx RING found for %pM\n", da);
 		goto drop;
 	}
 	/* set up vring entry */

drivers/net/wireless/ath/wil6210/txrx.h

@@ -567,11 +567,25 @@ static inline int wil_ring_is_full(struct wil_ring *ring)
 	return wil_ring_next_tail(ring) == ring->swhead;
 }
 
-static inline bool wil_need_txstat(struct sk_buff *skb)
+static inline u8 *wil_skb_get_da(struct sk_buff *skb)
+{
+	struct ethhdr *eth = (void *)skb->data;
+
+	return eth->h_dest;
+}
+
+static inline u8 *wil_skb_get_sa(struct sk_buff *skb)
 {
 	struct ethhdr *eth = (void *)skb->data;
 
-	return is_unicast_ether_addr(eth->h_dest) && skb->sk &&
+	return eth->h_source;
+}
+
+static inline bool wil_need_txstat(struct sk_buff *skb)
+{
+	const u8 *da = wil_skb_get_da(skb);
+
+	return is_unicast_ether_addr(da) && skb->sk &&
 	       (skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS);
 }