ixgbe: use different context for tso and offload

Change TSO offloads to use a different context than VLAN insertion
and Tx checksumming.  Hardware has separate registers internally for
storing these so use them.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/ixgbe/ixgbe_main.c

@@ -3126,6 +3126,8 @@ static int ixgbe_tso(struct ixgbe_adapter *adapter,
 		mss_l4len_idx |=
 		    (skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT);
 		mss_l4len_idx |= (l4len << IXGBE_ADVTXD_L4LEN_SHIFT);
+		/* use index 1 for TSO */
+		mss_l4len_idx |= (1 << IXGBE_ADVTXD_IDX_SHIFT);
 		context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);
 
 		tx_buffer_info->time_stamp = jiffies;
@@ -3198,6 +3200,7 @@ static bool ixgbe_tx_csum(struct ixgbe_adapter *adapter,
 		}
 
 		context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd_mlhl);
+		/* use index zero for tx checksum offload */
 		context_desc->mss_l4len_idx = 0;
 
 		tx_buffer_info->time_stamp = jiffies;
@@ -3306,6 +3309,8 @@ static void ixgbe_tx_queue(struct ixgbe_adapter *adapter,
 		olinfo_status |= IXGBE_TXD_POPTS_TXSM <<
 						IXGBE_ADVTXD_POPTS_SHIFT;
 
+		/* use index 1 context for tso */
+		olinfo_status |= (1 << IXGBE_ADVTXD_IDX_SHIFT);
 		if (tx_flags & IXGBE_TX_FLAGS_IPV4)
 			olinfo_status |= IXGBE_TXD_POPTS_IXSM <<
 						IXGBE_ADVTXD_POPTS_SHIFT;