wlcore/wl18xx: add hw op for Rx HW checksum

Some chip families can checksum certain classes of Rx packets in FW.
Implement the Rx-checksum feature as a HW-op. For the 18xx chip-family,
set Rx-checsum according to indication from FW.
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/ti/wl12xx/main.c

@@ -1314,6 +1314,7 @@ static struct wlcore_ops wl12xx_ops = {
 	.get_pg_ver		= wl12xx_get_pg_ver,
 	.get_mac		= wl12xx_get_mac,
 	.set_tx_desc_csum	= wl12xx_set_tx_desc_csum,
+	.set_rx_csum		= NULL,
 };
 
 static struct ieee80211_sta_ht_cap wl12xx_ht_cap = {

drivers/net/wireless/ti/wl18xx/main.c

@@ -39,6 +39,8 @@
 #include "wl18xx.h"
 
 
+#define WL18XX_RX_CHECKSUM_MASK      0x40
+
 static const u8 wl18xx_rate_to_idx_2ghz[] = {
 	/* MCS rates are used only with 11n */
 	15,                            /* WL18XX_CONF_HW_RXTX_RATE_MCS15 */
@@ -534,6 +536,14 @@ static void wl18xx_set_tx_desc_csum(struct wl1271 *wl,
 	desc->wl18xx_checksum_data |= (ip_hdr->protocol & 0x01);
 }
 
+static void wl18xx_set_rx_csum(struct wl1271 *wl,
+			       struct wl1271_rx_descriptor *desc,
+			       struct sk_buff *skb)
+{
+	if (desc->status & WL18XX_RX_CHECKSUM_MASK)
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+}
+
 static struct wlcore_ops wl18xx_ops = {
 	.identify_chip	= wl18xx_identify_chip,
 	.boot		= wl18xx_boot,
@@ -548,6 +558,7 @@ static struct wlcore_ops wl18xx_ops = {
 	.tx_delayed_compl = NULL,
 	.hw_init	= wl18xx_hw_init,
 	.set_tx_desc_csum = wl18xx_set_tx_desc_csum,
+	.set_rx_csum = wl18xx_set_rx_csum,
 };
 
 int __devinit wl18xx_probe(struct platform_device *pdev)

drivers/net/wireless/ti/wlcore/hw_ops.h

@@ -130,4 +130,13 @@ wlcore_hw_set_tx_desc_csum(struct wl1271 *wl,
 	wl->ops->set_tx_desc_csum(wl, desc, skb);
 }
 
+static inline void
+wlcore_hw_set_rx_csum(struct wl1271 *wl,
+		      struct wl1271_rx_descriptor *desc,
+		      struct sk_buff *skb)
+{
+	if (wl->ops->set_rx_csum)
+		wl->ops->set_rx_csum(wl, desc, skb);
+}
+
 #endif

drivers/net/wireless/ti/wlcore/rx.c

@@ -186,6 +186,7 @@ static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
 		is_data = 1;
 
 	wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
+	wlcore_hw_set_rx_csum(wl, desc, skb);
 
 	seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
 	wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,

drivers/net/wireless/ti/wlcore/wlcore.h

@@ -33,6 +33,7 @@
 /* forward declaration */
 struct wl1271_tx_hw_descr;
 enum wl_rx_buf_align;
+struct wl1271_rx_descriptor;
 
 struct wlcore_ops {
 	int (*identify_chip)(struct wl1271 *wl);
@@ -64,6 +65,9 @@ struct wlcore_ops {
 	void (*set_tx_desc_csum)(struct wl1271 *wl,
 				 struct wl1271_tx_hw_descr *desc,
 				 struct sk_buff *skb);
+	void (*set_rx_csum)(struct wl1271 *wl,
+			    struct wl1271_rx_descriptor *desc,
+			    struct sk_buff *skb);
 };
 
 enum wlcore_partitions {