netdev - [net-next 6/8] i40e: Add UDP segmentation offload support

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Date:   Tue, 29 Oct 2019 21:36:31 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Josh Hunt <johunt@...mai.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Andrew Bowers <andrewx.bowers@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 6/8] i40e: Add UDP segmentation offload support

From: Josh Hunt <johunt@...mai.com>

Based on a series from Alexander Duyck this change adds UDP segmentation
offload support to the i40e driver.

CC: Alexander Duyck <alexander.h.duyck@...el.com>
CC: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: Josh Hunt <johunt@...mai.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c |  1 +
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 12 +++++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 141575ada588..b3d7edbb1389 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -12931,6 +12931,7 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
 			  NETIF_F_GSO_IPXIP6		|
 			  NETIF_F_GSO_UDP_TUNNEL	|
 			  NETIF_F_GSO_UDP_TUNNEL_CSUM	|
+			  NETIF_F_GSO_UDP_L4		|
 			  NETIF_F_SCTP_CRC		|
 			  NETIF_F_RXHASH		|
 			  NETIF_F_RXCSUM		|
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index e3f29dc8b290..b8496037ef7f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2960,10 +2960,16 @@ static int i40e_tso(struct i40e_tx_buffer *first, u8 *hdr_len,
 
 	/* remove payload length from inner checksum */
 	paylen = skb->len - l4_offset;
-	csum_replace_by_diff(&l4.tcp->check, (__force __wsum)htonl(paylen));
 
-	/* compute length of segmentation header */
-	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
+	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
+		csum_replace_by_diff(&l4.udp->check, (__force __wsum)htonl(paylen));
+		/* compute length of segmentation header */
+		*hdr_len = sizeof(*l4.udp) + l4_offset;
+	} else {
+		csum_replace_by_diff(&l4.tcp->check, (__force __wsum)htonl(paylen));
+		/* compute length of segmentation header */
+		*hdr_len = (l4.tcp->doff * 4) + l4_offset;
+	}
 
 	/* pull values out of skb_shinfo */
 	gso_size = skb_shinfo(skb)->gso_size;
-- 
2.21.0