From c5122cf584128f9d42655189e69fda7151c1f275 Mon Sep 17 00:00:00 2001
From: Edward Cree <ecree@solarflare.com>
Date: Thu, 12 Nov 2020 15:20:05 +0000
Subject: [PATCH] sfc: support GRE TSO on EF100
We can treat SKB_GSO_GRE almost exactly the same as UDP tunnels, except
that we don't want to edit the outer UDP len (as there isn't one).
For SKB_GSO_GRE_CSUM, we have to use GSO_PARTIAL as the device doesn't
support offload of non-UDP outer L4 checksums.
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Martin Habets <mhabets@solarflare.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
---
drivers/net/ethernet/sfc/ef100_nic.c | 7 ++++++-
drivers/net/ethernet/sfc/ef100_tx.c | 6 +++++-
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
index 05d22220228a4..518268ce20644 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.c
+++ b/drivers/net/ethernet/sfc/ef100_nic.c
@@ -185,11 +185,16 @@ static int efx_ef100_init_datapath_caps(struct efx_nic *efx)
if (efx_ef100_has_cap(nic_data->datapath_caps2, TX_TSO_V3)) {
struct net_device *net_dev = efx->net_dev;
netdev_features_t tso = NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GSO_PARTIAL |
- NETIF_F_GSO_UDP_TUNNEL | NETIF_F_GSO_UDP_TUNNEL_CSUM;
+ NETIF_F_GSO_UDP_TUNNEL | NETIF_F_GSO_UDP_TUNNEL_CSUM |
+ NETIF_F_GSO_GRE | NETIF_F_GSO_GRE_CSUM;
net_dev->features |= tso;
net_dev->hw_features |= tso;
net_dev->hw_enc_features |= tso;
+ /* EF100 HW can only offload outer checksums if they are UDP,
+ * so for GRE_CSUM we have to use GSO_PARTIAL.
+ */
+ net_dev->gso_partial_features |= NETIF_F_GSO_GRE_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 a9e045c54a79e..26ef51d6b5423 100644
--- a/drivers/net/ethernet/sfc/ef100_tx.c
+++ b/drivers/net/ethernet/sfc/ef100_tx.c
@@ -194,6 +194,7 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
u16 vlan_tci = skb_vlan_tag_get(skb);
u32 mss = skb_shinfo(skb)->gso_size;
bool encap = skb->encapsulation;
+ bool udp_encap = false;
u16 vlan_enable = 0;
struct tcphdr *tcp;
bool outer_csum;
@@ -212,6 +213,9 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
outer_l4_offset = skb_transport_offset(skb);
ip_offset = skb_inner_network_offset(skb);
tcp_offset = skb_inner_transport_offset(skb);
+ if (skb_shinfo(skb)->gso_type &
+ (SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM))
+ udp_encap = true;
} else {
ip_offset = skb_network_offset(skb);
tcp_offset = skb_transport_offset(skb);
@@ -239,7 +243,7 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
ESF_GZ_TX_TSO_ED_INNER_IP_LEN, 1,
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_UDP_LEN, udp_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,
--
2.30.2