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

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Message-ID: <ZyzpJaRu9KWiEW8N@lizhi-Precision-Tower-5810>
Date: Thu, 7 Nov 2024 11:21:57 -0500
From: Frank Li <Frank.li@....com>
To: Wei Fang <wei.fang@....com>
Cc: 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, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH net-next 1/5] net: enetc: add Rx checksum offload for
 i.MX95 ENETC

On Thu, Nov 07, 2024 at 11:38:13AM +0800, Wei Fang wrote:
> 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>
> ---

Reviewed-by: Frank Li <Frank.Li@....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
>