liquidio: Consider PTP for packet size calculations

This patch is to refactor packet size calculations to support PTP enabled
for 66xx and 68xx cards and also other cards that do not support PTP.
Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/lio_main.c

@@ -84,6 +84,8 @@ static int conf_type;
 module_param(conf_type, int, 0);
 MODULE_PARM_DESC(conf_type, "select octeon configuration 0 default 1 ovs");
 
+static int ptp_enable = 1;
+
 /* Bit mask values for lio->ifstate */
 #define   LIO_IFSTATE_DROQ_OPS             0x01
 #define   LIO_IFSTATE_REGISTERED           0x02
@@ -1851,6 +1853,7 @@ liquidio_push_packet(u32 octeon_id,
 	if (netdev) {
 		int packet_was_received;
 		struct lio *lio = GET_LIO(netdev);
+		struct octeon_device *oct = lio->oct_dev;
 
 		/* Do not proceed if the interface is not in RUNNING state. */
 		if (!ifstate_check(lio, LIO_IFSTATE_RUNNING)) {
@@ -1889,21 +1892,26 @@ liquidio_push_packet(u32 octeon_id,
 			put_page(pg_info->page);
 		}
 
-		if (rh->r_dh.has_hwtstamp) {
-			/* timestamp is included from the hardware at the
-			 * beginning of the packet.
-			 */
-			if (ifstate_check(lio,
-					  LIO_IFSTATE_RX_TIMESTAMP_ENABLED)) {
-				/* Nanoseconds are in the first 64-bits
-				 * of the packet.
+		if (((oct->chip_id == OCTEON_CN66XX) ||
+		     (oct->chip_id == OCTEON_CN68XX)) &&
+		    ptp_enable) {
+			if (rh->r_dh.has_hwtstamp) {
+				/* timestamp is included from the hardware at
+				 * the beginning of the packet.
 				 */
-				memcpy(&ns, (skb->data), sizeof(ns));
-				shhwtstamps = skb_hwtstamps(skb);
-				shhwtstamps->hwtstamp =
-					ns_to_ktime(ns + lio->ptp_adjust);
+				if (ifstate_check
+				    (lio, LIO_IFSTATE_RX_TIMESTAMP_ENABLED)) {
+					/* Nanoseconds are in the first 64-bits
+					 * of the packet.
+					 */
+					memcpy(&ns, (skb->data), sizeof(ns));
+					shhwtstamps = skb_hwtstamps(skb);
+					shhwtstamps->hwtstamp =
+						ns_to_ktime(ns +
+							    lio->ptp_adjust);
+				}
+				skb_pull(skb, sizeof(ns));
 			}
-			skb_pull(skb, sizeof(ns));
 		}
 
 		skb->protocol = eth_type_trans(skb, skb->dev);

drivers/net/ethernet/cavium/liquidio/liquidio_common.h

@@ -174,9 +174,11 @@ static inline void add_sg_size(struct octeon_sg_entry *sg_entry,
 /*------------------------- End Scatter/Gather ---------------------------*/
 
 #define   OCTNET_FRM_PTP_HEADER_SIZE  8
-#define   OCTNET_FRM_HEADER_SIZE     30 /* PTP timestamp + VLAN + Ethernet */
 
-#define   OCTNET_MIN_FRM_SIZE        (64  + OCTNET_FRM_PTP_HEADER_SIZE)
+#define   OCTNET_FRM_HEADER_SIZE     22 /* VLAN + Ethernet */
+
+#define   OCTNET_MIN_FRM_SIZE        64
+
 #define   OCTNET_MAX_FRM_SIZE        (16000 + OCTNET_FRM_HEADER_SIZE)
 
 #define   OCTNET_DEFAULT_FRM_SIZE    (1500 + OCTNET_FRM_HEADER_SIZE)