linux-kernel - [PATCH net-next 1/5] net: enetc: add Rx checksum offload for i.MX95 ENETC

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Message-Id: <20241107033817.1654163-2-wei.fang@nxp.com>
Date: Thu,  7 Nov 2024 11:38:13 +0800
From: Wei Fang <wei.fang@....com>
To: claudiu.manoil@....com,
	vladimir.oltean@....com,
	xiaoning.wang@....com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev
Subject: [PATCH net-next 1/5] net: enetc: add Rx checksum offload for i.MX95 ENETC

ENETC rev 4.1 supports TCP and UDP checksum offload for receive, the bit
108 of the Rx BD will be set if the TCP/UDP checksum is correct. Since
this capability is not defined in register, the rx_csum bit is added to
struct enetc_drvdata to indicate whether the device supports Rx checksum
offload.

Signed-off-by: Wei Fang <wei.fang@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c       | 14 ++++++++++----
 drivers/net/ethernet/freescale/enetc/enetc.h       |  2 ++
 drivers/net/ethernet/freescale/enetc/enetc_hw.h    |  2 ++
 .../net/ethernet/freescale/enetc/enetc_pf_common.c |  3 +++
 4 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 35634c516e26..3137b6ee62d3 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1011,10 +1011,15 @@ static void enetc_get_offloads(struct enetc_bdr *rx_ring,
 
 	/* TODO: hashing */
 	if (rx_ring->ndev->features & NETIF_F_RXCSUM) {
-		u16 inet_csum = le16_to_cpu(rxbd->r.inet_csum);
-
-		skb->csum = csum_unfold((__force __sum16)~htons(inet_csum));
-		skb->ip_summed = CHECKSUM_COMPLETE;
+		if (priv->active_offloads & ENETC_F_RXCSUM &&
+		    le16_to_cpu(rxbd->r.flags) & ENETC_RXBD_FLAG_L4_CSUM_OK) {
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+		} else {
+			u16 inet_csum = le16_to_cpu(rxbd->r.inet_csum);
+
+			skb->csum = csum_unfold((__force __sum16)~htons(inet_csum));
+			skb->ip_summed = CHECKSUM_COMPLETE;
+		}
 	}
 
 	if (le16_to_cpu(rxbd->r.flags) & ENETC_RXBD_FLAG_VLAN) {
@@ -3281,6 +3286,7 @@ static const struct enetc_drvdata enetc_pf_data = {
 static const struct enetc_drvdata enetc4_pf_data = {
 	.sysclk_freq = ENETC_CLK_333M,
 	.pmac_offset = ENETC4_PMAC_OFFSET,
+	.rx_csum = 1,
 	.eth_ops = &enetc4_pf_ethtool_ops,
 };
 
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index 72fa03dbc2dd..5b65f79e05be 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -234,6 +234,7 @@ enum enetc_errata {
 
 struct enetc_drvdata {
 	u32 pmac_offset; /* Only valid for PSI which supports 802.1Qbu */
+	u8 rx_csum:1;
 	u64 sysclk_freq;
 	const struct ethtool_ops *eth_ops;
 };
@@ -341,6 +342,7 @@ enum enetc_active_offloads {
 	ENETC_F_QBV			= BIT(9),
 	ENETC_F_QCI			= BIT(10),
 	ENETC_F_QBU			= BIT(11),
+	ENETC_F_RXCSUM			= BIT(12),
 };
 
 enum enetc_flags_bit {
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index 7c3285584f8a..4b8fd1879005 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -645,6 +645,8 @@ union enetc_rx_bd {
 #define ENETC_RXBD_LSTATUS(flags)	((flags) << 16)
 #define ENETC_RXBD_FLAG_VLAN	BIT(9)
 #define ENETC_RXBD_FLAG_TSTMP	BIT(10)
+/* UDP and TCP checksum offload, for ENETC 4.1 and later */
+#define ENETC_RXBD_FLAG_L4_CSUM_OK	BIT(12)
 #define ENETC_RXBD_FLAG_TPID	GENMASK(1, 0)
 
 #define ENETC_MAC_ADDR_FILT_CNT	8 /* # of supported entries per port */
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
index 0eecfc833164..91e79582a541 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
@@ -119,6 +119,9 @@ void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
 
 	ndev->priv_flags |= IFF_UNICAST_FLT;
 
+	if (si->drvdata->rx_csum)
+		priv->active_offloads |= ENETC_F_RXCSUM;
+
 	/* TODO: currently, i.MX95 ENETC driver does not support advanced features */
 	if (!is_enetc_rev1(si)) {
 		ndev->hw_features &= ~(NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_LOOPBACK);
-- 
2.34.1