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net: ravb: Add VLAN checksum support

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The GbEth IP supports offloading checksum calculation for VLAN-tagged
packets, provided that the EtherType is 0x8100 and only one VLAN tag is
present.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
This commit is contained in:
Paul Barker 2024-10-15 14:36:34 +01:00 committed by Andrew Lunn
parent 85c1715098
commit 546875ccba
2 changed files with 21 additions and 4 deletions
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1
drivers/net/ethernet/renesas/ravb.h
View File

@ -1055,6 +1055,7 @@ struct ravb_hw_info {
size_t gstrings_size;
netdev_features_t net_hw_features;
netdev_features_t net_features;
netdev_features_t vlan_features;
int stats_len;
u32 tccr_mask;
u32 tx_max_frame_size;

24
drivers/net/ethernet/renesas/ravb_main.c
View File

@ -2063,13 +2063,27 @@ static void ravb_tx_timeout_work(struct work_struct *work)
static bool ravb_can_tx_csum_gbeth(struct sk_buff *skb)
{
u16 net_protocol = ntohs(skb->protocol);
u8 inner_protocol;
/* TODO: Need to add support for VLAN tag 802.1Q */
if (skb_vlan_tag_present(skb))
return false;
/* GbEth IP can calculate the checksum if:
* - there are zero or one VLAN headers with TPID=0x8100
* - the network protocol is IPv4 or IPv6
* - the transport protocol is TCP, UDP or ICMP
* - the packet is not fragmented
*/
switch (ntohs(skb->protocol)) {
if (net_protocol == ETH_P_8021Q) {
struct vlan_hdr vhdr, *vh;
vh = skb_header_pointer(skb, ETH_HLEN, sizeof(vhdr), &vhdr);
if (!vh)
return false;
net_protocol = ntohs(vh->h_vlan_encapsulated_proto);
}
switch (net_protocol) {
case ETH_P_IP:
inner_protocol = ip_hdr(skb)->protocol;
break;
@ -2772,6 +2786,7 @@ static const struct ravb_hw_info gbeth_hw_info = {
.gstrings_size = sizeof(ravb_gstrings_stats_gbeth),
.net_hw_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM,
.net_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM,
.vlan_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM,
.stats_len = ARRAY_SIZE(ravb_gstrings_stats_gbeth),
.tccr_mask = TCCR_TSRQ0,
.tx_max_frame_size = 1522,
@ -2914,6 +2929,7 @@ static int ravb_probe(struct platform_device *pdev)
ndev->features = info->net_features;
ndev->hw_features = info->net_hw_features;
ndev->vlan_features = info->vlan_features;
error = reset_control_deassert(rstc);
if (error)