ixgbe: enable TSO with IPsec offload

Fix things up to support TSO offload in conjunction
with IPsec hw offload.  This raises throughput with
IPsec offload on to nearly line rate.

Signed-off-by: Shannon Nelson <[email protected]>
Tested-by: Andrew Bowers <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>

Author: Shannon Nelson

drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c

@@ -929,8 +929,13 @@ void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
 	ixgbe_ipsec_clear_hw_tables(adapter);
 
 	adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
-	adapter->netdev->features |= NETIF_F_HW_ESP;
-	adapter->netdev->hw_enc_features |= NETIF_F_HW_ESP;
+
+#define IXGBE_ESP_FEATURES	(NETIF_F_HW_ESP | \
+				 NETIF_F_HW_ESP_TX_CSUM | \
+				 NETIF_F_GSO_ESP)
+
+	adapter->netdev->features |= IXGBE_ESP_FEATURES;
+	adapter->netdev->hw_enc_features |= IXGBE_ESP_FEATURES;
 
 	return;
 

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -7730,7 +7730,8 @@ static void ixgbe_service_task(struct work_struct *work)
 
 static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 		     struct ixgbe_tx_buffer *first,
-		     u8 *hdr_len)
+		     u8 *hdr_len,
+		     struct ixgbe_ipsec_tx_data *itd)
 {
 	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
 	struct sk_buff *skb = first->skb;
@@ -7744,6 +7745,7 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 		unsigned char *hdr;
 	} l4;
 	u32 paylen, l4_offset;
+	u32 fceof_saidx = 0;
 	int err;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
@@ -7769,13 +7771,15 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 	if (ip.v4->version == 4) {
 		unsigned char *csum_start = skb_checksum_start(skb);
 		unsigned char *trans_start = ip.hdr + (ip.v4->ihl * 4);
+		int len = csum_start - trans_start;
 
 		/* IP header will have to cancel out any data that
-		 * is not a part of the outer IP header
+		 * is not a part of the outer IP header, so set to
+		 * a reverse csum if needed, else init check to 0.
 		 */
-		ip.v4->check = csum_fold(csum_partial(trans_start,
-						      csum_start - trans_start,
-						      0));
+		ip.v4->check = (skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) ?
+					   csum_fold(csum_partial(trans_start,
+								  len, 0)) : 0;
 		type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
 
 		ip.v4->tot_len = 0;
@@ -7806,12 +7810,15 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
 	mss_l4len_idx = (*hdr_len - l4_offset) << IXGBE_ADVTXD_L4LEN_SHIFT;
 	mss_l4len_idx |= skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 
+	fceof_saidx |= itd->sa_idx;
+	type_tucmd |= itd->flags | itd->trailer_len;
+
 	/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 	vlan_macip_lens = l4.hdr - ip.hdr;
 	vlan_macip_lens |= (ip.hdr - skb->data) << IXGBE_ADVTXD_MACLEN_SHIFT;
 	vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 
-	ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, 0, type_tucmd,
+	ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fceof_saidx, type_tucmd,
 			  mss_l4len_idx);
 
 	return 1;
@@ -8502,7 +8509,7 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
 	if (skb->sp && !ixgbe_ipsec_tx(tx_ring, first, &ipsec_tx))
 		goto out_drop;
 #endif
-	tso = ixgbe_tso(tx_ring, first, &hdr_len);
+	tso = ixgbe_tso(tx_ring, first, &hdr_len, &ipsec_tx);
 	if (tso < 0)
 		goto out_drop;
 	else if (!tso)
@@ -9911,9 +9918,15 @@ ixgbe_features_check(struct sk_buff *skb, struct net_device *dev,
 
 	/* We can only support IPV4 TSO in tunnels if we can mangle the
 	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
+	 * IPsec offoad sets skb->encapsulation but still can handle
+	 * the TSO, so it's the exception.
 	 */
-	if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID))
-		features &= ~NETIF_F_TSO;
+	if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID)) {
+#ifdef CONFIG_XFRM
+		if (!skb->sp)
+#endif
+			features &= ~NETIF_F_TSO;
+	}
 
 	return features;
 }