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Message-ID: <Zyzq6RskMsXer6PV@lizhi-Precision-Tower-5810>
Date: Thu, 7 Nov 2024 11:29:29 -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 2/5] net: enetc: add Tx checksum offload for
 i.MX95 ENETC

On Thu, Nov 07, 2024 at 11:38:14AM +0800, Wei Fang wrote:
> In addition to supporting Rx checksum offload, i.MX95 ENETC also supports
> Tx checksum offload. The transmit checksum offload is implemented through
> the Tx BD. To support Tx checksum offload, software needs to fill some
> auxiliary information in Tx BD, such as IP version, IP header offset and
> size, whether L4 is UDP or TCP, etc.

Add empty line here

> Same as Rx checksum offload, Tx checksum offload capability isn't defined
> in register, so tx_csum bit is added to struct enetc_drvdata to indicate
> whether the device supports Tx checksum offload.
>
> Signed-off-by: Wei Fang <wei.fang@....com>
> ---
>  drivers/net/ethernet/freescale/enetc/enetc.c  | 52 ++++++++++++++++---
>  drivers/net/ethernet/freescale/enetc/enetc.h  |  2 +
>  .../net/ethernet/freescale/enetc/enetc_hw.h   | 14 +++--
>  .../freescale/enetc/enetc_pf_common.c         |  3 ++
>  4 files changed, 61 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
> index 3137b6ee62d3..f98d14841838 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc.c
> +++ b/drivers/net/ethernet/freescale/enetc/enetc.c
> @@ -143,6 +143,26 @@ static int enetc_ptp_parse(struct sk_buff *skb, u8 *udp,
>  	return 0;
>  }
>
> +static bool enetc_tx_csum_offload_check(struct sk_buff *skb)
> +{
> +	if (ip_hdr(skb)->version == 4)
> +		return ip_hdr(skb)->protocol == IPPROTO_TCP ||
> +		       ip_hdr(skb)->protocol == IPPROTO_UDP;
> +	else if (ip_hdr(skb)->version == 6)

needn't else

> +		return ipv6_hdr(skb)->nexthdr == NEXTHDR_TCP ||
> +		       ipv6_hdr(skb)->nexthdr == NEXTHDR_UDP;
> +	else

needn't else, I remember some compiler check will report warning.

> +		return false;
> +}
> +
> +static bool enetc_skb_is_tcp(struct sk_buff *skb)
> +{
> +	if (ip_hdr(skb)->version == 4)
> +		return ip_hdr(skb)->protocol == IPPROTO_TCP;
> +	else
> +		return ipv6_hdr(skb)->nexthdr == NEXTHDR_TCP;
> +}
> +
>  static int enetc_map_tx_buffs(struct enetc_bdr *tx_ring, struct sk_buff *skb)
>  {
>  	bool do_vlan, do_onestep_tstamp = false, do_twostep_tstamp = false;
> @@ -160,6 +180,29 @@ static int enetc_map_tx_buffs(struct enetc_bdr *tx_ring, struct sk_buff *skb)
>  	dma_addr_t dma;
>  	u8 flags = 0;
>
> +	enetc_clear_tx_bd(&temp_bd);
> +	if (skb->ip_summed == CHECKSUM_PARTIAL) {
> +		/* Can not support TSD and checksum offload at the same time */
> +		if (priv->active_offloads & ENETC_F_TXCSUM &&
> +		    enetc_tx_csum_offload_check(skb) && !tx_ring->tsd_enable) {
> +			bool is_ipv6 = ip_hdr(skb)->version == 6;
> +			bool is_tcp = enetc_skb_is_tcp(skb);
> +
> +			temp_bd.l3_start = skb_network_offset(skb);
> +			temp_bd.ipcs = is_ipv6 ? 0 : 1;
> +			temp_bd.l3_hdr_size = skb_network_header_len(skb) / 4;
> +			temp_bd.l3t = is_ipv6 ? 1 : 0;
> +			temp_bd.l4t = is_tcp ? ENETC_TXBD_L4T_TCP : ENETC_TXBD_L4T_UDP;
> +			flags |= ENETC_TXBD_FLAGS_CSUM_LSO | ENETC_TXBD_FLAGS_L4CS;
> +		} else {
> +			if (skb_checksum_help(skb)) {
> +				dev_err(tx_ring->dev, "skb_checksum_help() error\n");
> +
> +				return 0;
> +			}
> +		}
> +	}
> +
>  	i = tx_ring->next_to_use;
>  	txbd = ENETC_TXBD(*tx_ring, i);
>  	prefetchw(txbd);
> @@ -170,7 +213,6 @@ static int enetc_map_tx_buffs(struct enetc_bdr *tx_ring, struct sk_buff *skb)
>
>  	temp_bd.addr = cpu_to_le64(dma);
>  	temp_bd.buf_len = cpu_to_le16(len);
> -	temp_bd.lstatus = 0;

not sure why remove clean lstatus here.

Frank
>
>  	tx_swbd = &tx_ring->tx_swbd[i];
>  	tx_swbd->dma = dma;
> @@ -591,7 +633,7 @@ static netdev_tx_t enetc_start_xmit(struct sk_buff *skb,
>  {
>  	struct enetc_ndev_priv *priv = netdev_priv(ndev);
>  	struct enetc_bdr *tx_ring;
> -	int count, err;
> +	int count;
>
>  	/* Queue one-step Sync packet if already locked */
>  	if (skb->cb[0] & ENETC_F_TX_ONESTEP_SYNC_TSTAMP) {
> @@ -624,11 +666,6 @@ static netdev_tx_t enetc_start_xmit(struct sk_buff *skb,
>  			return NETDEV_TX_BUSY;
>  		}
>
> -		if (skb->ip_summed == CHECKSUM_PARTIAL) {
> -			err = skb_checksum_help(skb);
> -			if (err)
> -				goto drop_packet_err;
> -		}
>  		enetc_lock_mdio();
>  		count = enetc_map_tx_buffs(tx_ring, skb);
>  		enetc_unlock_mdio();
> @@ -3287,6 +3324,7 @@ static const struct enetc_drvdata enetc4_pf_data = {
>  	.sysclk_freq = ENETC_CLK_333M,
>  	.pmac_offset = ENETC4_PMAC_OFFSET,
>  	.rx_csum = 1,
> +	.tx_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 5b65f79e05be..ee11ff97e9ed 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc.h
> +++ b/drivers/net/ethernet/freescale/enetc/enetc.h
> @@ -235,6 +235,7 @@ enum enetc_errata {
>  struct enetc_drvdata {
>  	u32 pmac_offset; /* Only valid for PSI which supports 802.1Qbu */
>  	u8 rx_csum:1;
> +	u8 tx_csum:1;
>  	u64 sysclk_freq;
>  	const struct ethtool_ops *eth_ops;
>  };
> @@ -343,6 +344,7 @@ enum enetc_active_offloads {
>  	ENETC_F_QCI			= BIT(10),
>  	ENETC_F_QBU			= BIT(11),
>  	ENETC_F_RXCSUM			= BIT(12),
> +	ENETC_F_TXCSUM			= BIT(13),
>  };
>
>  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 4b8fd1879005..590b1412fadf 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
> +++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
> @@ -558,7 +558,12 @@ union enetc_tx_bd {
>  		__le16 frm_len;
>  		union {
>  			struct {
> -				u8 reserved[3];
> +				u8 l3_start:7;
> +				u8 ipcs:1;
> +				u8 l3_hdr_size:7;
> +				u8 l3t:1;
> +				u8 resv:5;
> +				u8 l4t:3;
>  				u8 flags;
>  			}; /* default layout */
>  			__le32 txstart;
> @@ -582,10 +587,10 @@ union enetc_tx_bd {
>  };
>
>  enum enetc_txbd_flags {
> -	ENETC_TXBD_FLAGS_RES0 = BIT(0), /* reserved */
> +	ENETC_TXBD_FLAGS_L4CS = BIT(0), /* For ENETC 4.1 and later */
>  	ENETC_TXBD_FLAGS_TSE = BIT(1),
>  	ENETC_TXBD_FLAGS_W = BIT(2),
> -	ENETC_TXBD_FLAGS_RES3 = BIT(3), /* reserved */
> +	ENETC_TXBD_FLAGS_CSUM_LSO = BIT(3), /* For ENETC 4.1 and later */
>  	ENETC_TXBD_FLAGS_TXSTART = BIT(4),
>  	ENETC_TXBD_FLAGS_EX = BIT(6),
>  	ENETC_TXBD_FLAGS_F = BIT(7)
> @@ -594,6 +599,9 @@ enum enetc_txbd_flags {
>  #define ENETC_TXBD_TXSTART_MASK GENMASK(24, 0)
>  #define ENETC_TXBD_FLAGS_OFFSET 24
>
> +#define ENETC_TXBD_L4T_UDP	BIT(0)
> +#define ENETC_TXBD_L4T_TCP	BIT(1)
> +
>  static inline __le32 enetc_txbd_set_tx_start(u64 tx_start, u8 flags)
>  {
>  	u32 temp;
> diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
> index 91e79582a541..3a8a5b6d8c26 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
> +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
> @@ -122,6 +122,9 @@ void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
>  	if (si->drvdata->rx_csum)
>  		priv->active_offloads |= ENETC_F_RXCSUM;
>
> +	if (si->drvdata->tx_csum)
> +		priv->active_offloads |= ENETC_F_TXCSUM;
> +
>  	/* 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
>

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