netdev - [PATCH net-next 2/3] sfc: correctly support non-partial GSO_UDP_TUNNEL

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Date:   Thu, 12 Nov 2020 15:19:47 +0000
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <kuba@...nel.org>
CC:     <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: [PATCH net-next 2/3] sfc: correctly support non-partial
 GSO_UDP_TUNNEL_CSUM on EF100

By asking the HW for the correct edits, we can make UDP tunnel TSO
 work without needing GSO_PARTIAL.  So don't specify it in our
 netdev->gso_partial_features.
However, retain GSO_PARTIAL support, as this will be used for other
 protocols later.

Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 drivers/net/ethernet/sfc/ef100_nic.c | 1 -
 drivers/net/ethernet/sfc/ef100_tx.c  | 6 +++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
index cd93c5ffd45c..05d22220228a 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.c
+++ b/drivers/net/ethernet/sfc/ef100_nic.c
@@ -190,7 +190,6 @@ static int efx_ef100_init_datapath_caps(struct efx_nic *efx)
 		net_dev->features |= tso;
 		net_dev->hw_features |= tso;
 		net_dev->hw_enc_features |= tso;
-		net_dev->gso_partial_features |= NETIF_F_GSO_UDP_TUNNEL | NETIF_F_GSO_UDP_TUNNEL_CSUM;
 	}
 	efx->num_mac_stats = MCDI_WORD(outbuf,
 				       GET_CAPABILITIES_V4_OUT_MAC_STATS_NUM_STATS);
diff --git a/drivers/net/ethernet/sfc/ef100_tx.c b/drivers/net/ethernet/sfc/ef100_tx.c
index ad0ad9bad423..a9e045c54a79 100644
--- a/drivers/net/ethernet/sfc/ef100_tx.c
+++ b/drivers/net/ethernet/sfc/ef100_tx.c
@@ -196,6 +196,7 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
 	bool encap = skb->encapsulation;
 	u16 vlan_enable = 0;
 	struct tcphdr *tcp;
+	bool outer_csum;
 	u32 paylen;
 
 	if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID)
@@ -216,19 +217,21 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
 		tcp_offset = skb_transport_offset(skb);
 		outer_ip_offset = outer_l4_offset = 0;
 	}
+	outer_csum = skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM;
 
 	/* subtract TCP payload length from inner checksum */
 	tcp = (void *)skb->data + tcp_offset;
 	paylen = skb->len - tcp_offset;
 	csum_replace_by_diff(&tcp->check, (__force __wsum)htonl(paylen));
 
-	EFX_POPULATE_OWORD_17(*txd,
+	EFX_POPULATE_OWORD_19(*txd,
 			      ESF_GZ_TX_DESC_TYPE, ESE_GZ_TX_DESC_TYPE_TSO,
 			      ESF_GZ_TX_TSO_MSS, mss,
 			      ESF_GZ_TX_TSO_HDR_NUM_SEGS, 1,
 			      ESF_GZ_TX_TSO_PAYLOAD_NUM_SEGS, payload_segs,
 			      ESF_GZ_TX_TSO_HDR_LEN_W, buffer->len >> 1,
 			      ESF_GZ_TX_TSO_PAYLOAD_LEN, len,
+			      ESF_GZ_TX_TSO_CSO_OUTER_L4, outer_csum,
 			      ESF_GZ_TX_TSO_CSO_INNER_L4, 1,
 			      ESF_GZ_TX_TSO_INNER_L3_OFF_W, ip_offset >> 1,
 			      ESF_GZ_TX_TSO_INNER_L4_OFF_W, tcp_offset >> 1,
@@ -237,6 +240,7 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
 			      ESF_GZ_TX_TSO_OUTER_L3_OFF_W, outer_ip_offset >> 1,
 			      ESF_GZ_TX_TSO_OUTER_L4_OFF_W, outer_l4_offset >> 1,
 			      ESF_GZ_TX_TSO_ED_OUTER_UDP_LEN, encap && !gso_partial,
+			      ESF_GZ_TX_TSO_ED_OUTER_IP_LEN, encap && !gso_partial,
 			      ESF_GZ_TX_TSO_ED_OUTER_IP4_ID, encap ? mangleid :
 								     ESE_GZ_TX_DESC_IP4_ID_NO_OP,
 			      ESF_GZ_TX_TSO_VLAN_INSERT_EN, vlan_enable,