1 files changed, 84 insertions, 64 deletions

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index c7ec23688d56..ac0f093f647a 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -504,11 +504,10 @@ static void ravb_csum_init_gbeth(struct net_device *ndev)
 			ndev->features &= ~NETIF_F_RXCSUM;
 	} else {
 		if (tx_enable)
-			ravb_write(ndev, CSR1_TIP4 | CSR1_TTCP4 | CSR1_TUDP4, CSR1);
+			ravb_write(ndev, CSR1_CSUM_ENABLE, CSR1);
 
 		if (rx_enable)
-			ravb_write(ndev, CSR2_RIP4 | CSR2_RTCP4 | CSR2_RUDP4 | CSR2_RICMP4,
-				   CSR2);
+			ravb_write(ndev, CSR2_CSUM_ENABLE, CSR2);
 	}
 
 done:
@@ -555,8 +554,16 @@ static void ravb_emac_init_gbeth(struct net_device *ndev)
 
 static void ravb_emac_init_rcar(struct net_device *ndev)
 {
-	/* Receive frame limit set register */
-	ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR);
+	struct ravb_private *priv = netdev_priv(ndev);
+
+	/* Set receive frame length
+	 *
+	 * The length set here describes the frame from the destination address
+	 * up to and including the CRC data. However only the frame data,
+	 * excluding the CRC, are transferred to memory. To allow for the
+	 * largest frames add the CRC length to the maximum Rx descriptor size.
+	 */
+	ravb_write(ndev, priv->info->rx_max_frame_size + ETH_FCS_LEN, RFLR);
 
 	/* EMAC Mode: PAUSE prohibition; Duplex; RX Checksum; TX; RX */
 	ravb_write(ndev, ECMR_ZPF | ECMR_DM |
@@ -742,38 +749,34 @@ static void ravb_get_tx_tstamp(struct net_device *ndev)
 static void ravb_rx_csum_gbeth(struct sk_buff *skb)
 {
 	struct skb_shared_info *shinfo = skb_shinfo(skb);
-	__wsum csum_ip_hdr, csum_proto;
-	skb_frag_t *last_frag;
-	u8 *hw_csum;
-
-	/* The hardware checksum status is contained in sizeof(__sum16) * 2 = 4
-	 * bytes appended to packet data. First 2 bytes is ip header checksum
-	 * and last 2 bytes is protocol checksum.
+	size_t csum_len;
+	u16 *hw_csum;
+
+	/* The hardware checksum status is contained in 4 bytes appended to
+	 * packet data.
+	 *
+	 * For ipv4, the first 2 bytes are the ip header checksum status. We can
+	 * ignore this as it will always be re-checked in inet_gro_receive().
+	 *
+	 * The last 2 bytes are the protocol checksum status which will be zero
+	 * if the checksum has been validated.
 	 */
-	if (unlikely(skb->len < sizeof(__sum16) * 2))
+	csum_len = sizeof(*hw_csum) * 2;
+	if (unlikely(skb->len < csum_len))
 		return;
 
 	if (skb_is_nonlinear(skb)) {
-		last_frag = &shinfo->frags[shinfo->nr_frags - 1];
-		hw_csum = skb_frag_address(last_frag) +
-			  skb_frag_size(last_frag);
+		skb_frag_t *last_frag = &shinfo->frags[shinfo->nr_frags - 1];
+
+		hw_csum = (u16 *)(skb_frag_address(last_frag) +
+				  skb_frag_size(last_frag));
+		skb_frag_size_sub(last_frag, csum_len);
 	} else {
-		hw_csum = skb_tail_pointer(skb);
+		hw_csum = (u16 *)skb_tail_pointer(skb);
+		skb_trim(skb, skb->len - csum_len);
 	}
 
-	hw_csum -= sizeof(__sum16);
-	csum_proto = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum));
-
-	hw_csum -= sizeof(__sum16);
-	csum_ip_hdr = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum));
-
-	if (skb_is_nonlinear(skb))
-		skb_frag_size_sub(last_frag, 2 * sizeof(__sum16));
-	else
-		skb_trim(skb, skb->len - 2 * sizeof(__sum16));
-
-	/* TODO: IPV6 Rx checksum */
-	if (skb->protocol == htons(ETH_P_IP) && !csum_ip_hdr && !csum_proto)
+	if (!get_unaligned(--hw_csum))
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 }
 
@@ -1742,20 +1745,19 @@ static int ravb_get_ts_info(struct net_device *ndev,
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *hw_info = priv->info;
 
-	info->so_timestamping =
-		SOF_TIMESTAMPING_TX_SOFTWARE |
-		SOF_TIMESTAMPING_TX_HARDWARE |
-		SOF_TIMESTAMPING_RX_HARDWARE |
-		SOF_TIMESTAMPING_RAW_HARDWARE;
-	info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
-	info->rx_filters =
-		(1 << HWTSTAMP_FILTER_NONE) |
-		(1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
-		(1 << HWTSTAMP_FILTER_ALL);
-	if (hw_info->gptp || hw_info->ccc_gac)
+	if (hw_info->gptp || hw_info->ccc_gac) {
+		info->so_timestamping =
+			SOF_TIMESTAMPING_TX_SOFTWARE |
+			SOF_TIMESTAMPING_TX_HARDWARE |
+			SOF_TIMESTAMPING_RX_HARDWARE |
+			SOF_TIMESTAMPING_RAW_HARDWARE;
+		info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
+		info->rx_filters =
+			(1 << HWTSTAMP_FILTER_NONE) |
+			(1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
+			(1 << HWTSTAMP_FILTER_ALL);
 		info->phc_index = ptp_clock_index(priv->ptp.clock);
-	else
-		info->phc_index = 0;
+	}
 
 	return 0;
 }
@@ -2060,32 +2062,44 @@ out_unlock:
 
 static bool ravb_can_tx_csum_gbeth(struct sk_buff *skb)
 {
-	struct iphdr *ip = ip_hdr(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
+	 */
 
-	/* TODO: Need to add hardware checksum for IPv6 */
-	if (skb->protocol != htons(ETH_P_IP))
-		return false;
+	if (net_protocol == ETH_P_8021Q) {
+		struct vlan_hdr vhdr, *vh;
 
-	switch (ip->protocol) {
-	case IPPROTO_TCP:
-		break;
-	case IPPROTO_UDP:
-		/* If the checksum value in the UDP header field is 0, TOE does
-		 * not calculate checksum for UDP part of this frame as it is
-		 * optional function as per standards.
-		 */
-		if (udp_hdr(skb)->check == 0)
+		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;
+	case ETH_P_IPV6:
+		inner_protocol = ipv6_hdr(skb)->nexthdr;
 		break;
 	default:
 		return false;
 	}
 
-	return true;
+	switch (inner_protocol) {
+	case IPPROTO_TCP:
+	case IPPROTO_UDP:
+		return true;
+	default:
+		return false;
+	}
 }
 
 /* Packet transmit function for Ethernet AVB */
@@ -2523,7 +2537,7 @@ static int ravb_set_features_gbeth(struct net_device *ndev,
 	spin_lock_irqsave(&priv->lock, flags);
 	if (changed & NETIF_F_RXCSUM) {
 		if (features & NETIF_F_RXCSUM)
-			val = CSR2_RIP4 | CSR2_RTCP4 | CSR2_RUDP4 | CSR2_RICMP4;
+			val = CSR2_CSUM_ENABLE;
 		else
 			val = 0;
 
@@ -2534,7 +2548,7 @@ static int ravb_set_features_gbeth(struct net_device *ndev,
 
 	if (changed & NETIF_F_HW_CSUM) {
 		if (features & NETIF_F_HW_CSUM)
-			val = CSR1_TIP4 | CSR1_TTCP4 | CSR1_TUDP4;
+			val = CSR1_CSUM_ENABLE;
 		else
 			val = 0;
 
@@ -2674,6 +2688,7 @@ static const struct ravb_hw_info ravb_gen2_hw_info = {
 	.net_features = NETIF_F_RXCSUM,
 	.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
 	.tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
+	.tx_max_frame_size = SZ_2K,
 	.rx_max_frame_size = SZ_2K,
 	.rx_buffer_size = SZ_2K +
 			  SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
@@ -2696,6 +2711,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = {
 	.net_features = NETIF_F_RXCSUM,
 	.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
 	.tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
+	.tx_max_frame_size = SZ_2K,
 	.rx_max_frame_size = SZ_2K,
 	.rx_buffer_size = SZ_2K +
 			  SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
@@ -2721,6 +2737,7 @@ static const struct ravb_hw_info ravb_gen4_hw_info = {
 	.net_features = NETIF_F_RXCSUM,
 	.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
 	.tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
+	.tx_max_frame_size = SZ_2K,
 	.rx_max_frame_size = SZ_2K,
 	.rx_buffer_size = SZ_2K +
 			  SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
@@ -2768,8 +2785,10 @@ 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,
 	.rx_max_frame_size = SZ_8K,
 	.rx_buffer_size = SZ_2K,
 	.rx_desc_size = sizeof(struct ravb_rx_desc),
@@ -2909,6 +2928,7 @@ 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)
@@ -2981,7 +3001,7 @@ static int ravb_probe(struct platform_device *pdev)
 	priv->avb_link_active_low =
 		of_property_read_bool(np, "renesas,ether-link-active-low");
 
-	ndev->max_mtu = info->rx_max_frame_size -
+	ndev->max_mtu = info->tx_max_frame_size -
 		(ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
 	ndev->min_mtu = ETH_MIN_MTU;
 
@@ -3279,7 +3299,7 @@ static const struct dev_pm_ops ravb_dev_pm_ops = {
 
 static struct platform_driver ravb_driver = {
 	.probe		= ravb_probe,
-	.remove_new	= ravb_remove,
+	.remove		= ravb_remove,
 	.driver = {
 		.name	= "ravb",
 		.pm	= pm_ptr(&ravb_dev_pm_ops),