TOE has hw support for calculating IP header checkum for IPV4 and
TCP/UDP/ICMP checksum for both IPV4 and IPV6.
This patch adds Rx checksum offload supported by TOE.
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
drivers/net/ethernet/renesas/ravb.h | 4 +++
drivers/net/ethernet/renesas/ravb_main.c | 31 ++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index a96552348e2d..d0e5eec0636e 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -44,6 +44,10 @@
#define RAVB_RXTSTAMP_TYPE_ALL 0x00000006
#define RAVB_RXTSTAMP_ENABLED 0x00000010 /* Enable RX timestamping */
+/* GbEthernet TOE hardware checksum values */
+#define TOE_RX_CSUM_OK 0x0000
+#define TOE_RX_CSUM_UNSUPPORTED 0xFFFF
+
enum ravb_reg {
/* AVB-DMAC registers */
CCC = 0x0000,
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index c2b92c6a6cd2..2533e3401593 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -720,6 +720,33 @@ static void ravb_get_tx_tstamp(struct net_device *ndev)
}
}
+static void ravb_rx_csum_gbeth(struct sk_buff *skb)
+{
+ u32 csum_ip_hdr, csum_proto;
+ u8 *hw_csum;
+
+ /* The hardware checksum is contained in sizeof(__sum16) * 2 = 4 bytes
+ * appended to packet data. First 2 bytes is ip header csum and last
+ * 2 bytes is protocol csum.
+ */
+ if (unlikely(skb->len < sizeof(__sum16) * 2))
+ return;
+ hw_csum = skb_tail_pointer(skb) - sizeof(__sum16);
+ csum_proto = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum));
+
+ hw_csum = skb_tail_pointer(skb) - 2 * sizeof(__sum16);
+ csum_ip_hdr = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum));
+
+ skb->ip_summed = CHECKSUM_NONE;
+ if (csum_proto == TOE_RX_CSUM_OK) {
+ if (skb->protocol == htons(ETH_P_IP) && csum_ip_hdr == TOE_RX_CSUM_OK)
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ else if (skb->protocol == htons(ETH_P_IPV6) &&
+ csum_ip_hdr == TOE_RX_CSUM_UNSUPPORTED)
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+}
+
static void ravb_rx_csum(struct sk_buff *skb)
{
u8 *hw_csum;
@@ -805,6 +832,8 @@ static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
skb = ravb_get_skb_gbeth(ndev, entry, desc);
skb_put(skb, pkt_len);
skb->protocol = eth_type_trans(skb, ndev);
+ if (ndev->features & NETIF_F_RXCSUM)
+ ravb_rx_csum_gbeth(skb);
napi_gro_receive(&priv->napi[q], skb);
stats->rx_packets++;
stats->rx_bytes += pkt_len;
@@ -832,6 +861,8 @@ static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
dev_kfree_skb(skb);
priv->rx_1st_skb->protocol =
eth_type_trans(priv->rx_1st_skb, ndev);
+ if (ndev->features & NETIF_F_RXCSUM)
+ ravb_rx_csum_gbeth(skb);
napi_gro_receive(&priv->napi[q],
priv->rx_1st_skb);
stats->rx_packets++;
--
2.17.1
