netdev - [PATCH net-next 3/7] net: hns3: add UDP segmentation offload support

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Date:   Tue, 29 Sep 2020 17:32:01 +0800
From:   Huazhong Tan <tanhuazhong@...wei.com>
To:     <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <linuxarm@...wei.com>, <kuba@...nel.org>,
        Huazhong Tan <tanhuazhong@...wei.com>
Subject: [PATCH net-next 3/7] net: hns3: add UDP segmentation offload support

Add support for UDP segmentation offload to the HNS3 driver
when the device can do it.

Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index df52abb..a362516 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -696,12 +696,19 @@ static int hns3_set_tso(struct sk_buff *skb, u32 *paylen,
 
 	/* normal or tunnel packet */
 	l4_offset = l4.hdr - skb->data;
-	hdr_len = (l4.tcp->doff << 2) + l4_offset;
 
 	/* remove payload length from inner pseudo checksum when tso */
 	l4_paylen = skb->len - l4_offset;
-	csum_replace_by_diff(&l4.tcp->check,
-			     (__force __wsum)htonl(l4_paylen));
+
+	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
+		hdr_len = sizeof(*l4.udp) + l4_offset;
+		csum_replace_by_diff(&l4.udp->check,
+				     (__force __wsum)htonl(l4_paylen));
+	} else {
+		hdr_len = (l4.tcp->doff << 2) + l4_offset;
+		csum_replace_by_diff(&l4.tcp->check,
+				     (__force __wsum)htonl(l4_paylen));
+	}
 
 	/* find the txbd field values */
 	*paylen = skb->len - hdr_len;
@@ -2311,6 +2318,13 @@ static void hns3_set_default_feature(struct net_device *netdev)
 			netdev->features |= NETIF_F_NTUPLE;
 		}
 	}
+
+	if (test_bit(HNAE3_DEV_SUPPORT_UDP_GSO_B, ae_dev->caps)) {
+		netdev->hw_features |= NETIF_F_GSO_UDP_L4;
+		netdev->features |= NETIF_F_GSO_UDP_L4;
+		netdev->vlan_features |= NETIF_F_GSO_UDP_L4;
+		netdev->hw_enc_features |= NETIF_F_GSO_UDP_L4;
+	}
 }
 
 static int hns3_alloc_buffer(struct hns3_enet_ring *ring,
-- 
2.7.4