[PATCH net-next v2 1/1] ice: add support BIG TCP on IPv6

[Pawel Chmielewski <pawel.chmielewski@intel.com>]

Enable sending BIG TCP packets on IPv6 in the ice driver using generic
ipv6_hopopt_jumbo_remove helper for stripping HBH header.

Tested:
netperf -t TCP_RR -H 2001:db8:0:f101::1  -- -r80000,80000 -O MIN_LATENCY,P90_LATENCY,P99_LATENCY,TRANSACTION_RATE

Tested on two different setups. In both cases, the following settings were
applied after loading the changed driver:

ip link set dev enp175s0f1np1 gso_max_size 130000
ip link set dev enp175s0f1np1 gro_max_size 130000
ip link set dev enp175s0f1np1 mtu 9000

First setup:
Before:
Minimum      90th         99th         Transaction
Latency      Percentile   Percentile   Rate
Microseconds Latency      Latency      Tran/s
             Microseconds Microseconds
134          279          410          3961.584

After:
Minimum      90th         99th         Transaction
Latency      Percentile   Percentile   Rate
Microseconds Latency      Latency      Tran/s
             Microseconds Microseconds
135          178          216          6093.404

The other setup:
Before:
Minimum      90th         99th         Transaction
Latency      Percentile   Percentile   Rate
Microseconds Latency      Latency      Tran/s
             Microseconds Microseconds
218          414          478          2944.765

After:
Minimum      90th         99th         Transaction
Latency      Percentile   Percentile   Rate
Microseconds Latency      Latency      Tran/s
             Microseconds Microseconds
146          238          266          4700.596

Signed-off-by: Pawel Chmielewski <pawel.chmielewski@intel.com>
---

Changes since v1:
 * Added testing results
---
 drivers/net/ethernet/intel/ice/ice.h      | 2 ++
 drivers/net/ethernet/intel/ice/ice_main.c | 2 ++
 drivers/net/ethernet/intel/ice/ice_txrx.c | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 3d26ff4122e0..c774fdd482cd 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -122,6 +122,8 @@
 
 #define ICE_MAX_MTU	(ICE_AQ_SET_MAC_FRAME_SIZE_MAX - ICE_ETH_PKT_HDR_PAD)
 
+#define ICE_MAX_TSO_SIZE 131072
+
 #define ICE_UP_TABLE_TRANSLATE(val, i) \
 		(((val) << ICE_AQ_VSI_UP_TABLE_UP##i##_S) & \
 		  ICE_AQ_VSI_UP_TABLE_UP##i##_M)
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 22b8ad058286..8c74a48ad0d3 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3421,6 +3421,8 @@ static void ice_set_netdev_features(struct net_device *netdev)
 	 * be changed at runtime
 	 */
 	netdev->hw_features |= NETIF_F_RXFCS;
+
+	netif_set_tso_max_size(netdev, ICE_MAX_TSO_SIZE);
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index ccf09c957a1c..bef927afb766 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -2297,6 +2297,9 @@ ice_xmit_frame_ring(struct sk_buff *skb, struct ice_tx_ring *tx_ring)
 
 	ice_trace(xmit_frame_ring, tx_ring, skb);
 
+	if (unlikely(ipv6_hopopt_jumbo_remove(skb)))
+		goto out_drop;
+
 	count = ice_xmit_desc_count(skb);
 	if (ice_chk_linearize(skb, count)) {
 		if (__skb_linearize(skb))
-- 
2.37.3