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Message-ID: <ZzOOulVvfGiqYc7s@lizhi-Precision-Tower-5810>
Date: Tue, 12 Nov 2024 12:22:02 -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 v3 net-next 2/5] net: enetc: add Tx checksum offload for
i.MX95 ENETC
On Tue, Nov 12, 2024 at 05:14:44PM +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.
>
> 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>
Reviewed-by: Frank Li <Frank.Li@....com>
> ---
> v2: refine enetc_tx_csum_offload_check().
> v3:
> 1. refine enetc_tx_csum_offload_check() and enetc_skb_is_tcp() through
> skb->csum_offset instead of touching skb->data.
> 2. add enetc_skb_is_ipv6() helper function
> ---
> drivers/net/ethernet/freescale/enetc/enetc.c | 51 ++++++++++++++++---
> 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, 60 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
> index 3137b6ee62d3..eeefd536d051 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc.c
> +++ b/drivers/net/ethernet/freescale/enetc/enetc.c
> @@ -143,6 +143,27 @@ static int enetc_ptp_parse(struct sk_buff *skb, u8 *udp,
> return 0;
> }
>
> +static bool enetc_tx_csum_offload_check(struct sk_buff *skb)
> +{
> + switch (skb->csum_offset) {
> + case offsetof(struct tcphdr, check):
> + case offsetof(struct udphdr, check):
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static inline bool enetc_skb_is_ipv6(struct sk_buff *skb)
> +{
> + return vlan_get_protocol(skb) == htons(ETH_P_IPV6);
> +}
> +
> +static inline bool enetc_skb_is_tcp(struct sk_buff *skb)
> +{
> + return skb->csum_offset == offsetof(struct tcphdr, check);
> +}
> +
> 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 +181,27 @@ 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) {
> + temp_bd.l3_start = skb_network_offset(skb);
> + temp_bd.ipcs = enetc_skb_is_ipv6(skb) ? 0 : 1;
> + temp_bd.l3_hdr_size = skb_network_header_len(skb) / 4;
> + temp_bd.l3t = enetc_skb_is_ipv6(skb) ? 1 : 0;
> + temp_bd.l4t = enetc_skb_is_tcp(skb) ? 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 +212,6 @@ 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;
>
> tx_swbd = &tx_ring->tx_swbd[i];
> tx_swbd->dma = dma;
> @@ -591,7 +632,7 @@ 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 +665,6 @@ 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 +3323,7 @@ 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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