p54: more cryptographic accelerator fixes

If we let the firmware do the data encryption, we have to remove the ICV and
(M)MIC at the end of the frame before we can give it back to mac80211.
Or, these data frames have a few trailing bytes on cooked monitor interfaces.
Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/p54/p54common.c

@@ -745,7 +745,7 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(entry);
 		struct p54_hdr *entry_hdr;
 		struct p54_tx_data *entry_data;
-		int pad = 0;
+		unsigned int pad = 0, frame_len;
 
 		range = (void *)info->rate_driver_data;
 		if (range->start_addr != addr) {
@@ -768,6 +768,7 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
 		__skb_unlink(entry, &priv->tx_queue);
 		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 
+		frame_len = entry->len;
 		entry_hdr = (struct p54_hdr *) entry->data;
 		entry_data = (struct p54_tx_data *) entry_hdr->data;
 		priv->tx_stats[entry_data->hw_queue].len--;
@@ -814,7 +815,9 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
 		info->status.ack_signal = p54_rssi_to_dbm(dev,
 				(int)payload->ack_rssi);
 
-		if (entry_data->key_type == P54_CRYPTO_TKIPMICHAEL) {
+		/* Undo all changes to the frame. */
+		switch (entry_data->key_type) {
+		case P54_CRYPTO_TKIPMICHAEL: {
 			u8 *iv = (u8 *)(entry_data->align + pad +
 					entry_data->crypt_offset);
 
@@ -822,7 +825,18 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
 			iv[2] = iv[0];
 			iv[0] = iv[1];
 			iv[1] = (iv[0] | 0x20) & 0x7f;	/* WEPSeed - 8.3.2.2 */
+
+			frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
+			break;
+			}
+		case P54_CRYPTO_AESCCMP:
+			frame_len -= 8; /* remove CCMP_MIC */
+			break;
+		case P54_CRYPTO_WEP:
+			frame_len -= 4; /* remove WEP_ICV */
+			break;
 		}
+		skb_trim(entry, frame_len);
 		skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
 		ieee80211_tx_status_irqsafe(dev, entry);
 		goto out;