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Date: Wed, 17 Apr 2024 17:22:56 +0530
From: Chintan Vankar <c-vankar@...com>
To: Julien Panis <jpanis@...libre.com>, Arnd Bergmann <arnd@...db.de>,
"Dan
Carpenter" <dan.carpenter@...aro.org>,
Heiner Kallweit
<hkallweit1@...il.com>,
Grygorii Strashko <grygorii.strashko@...com>,
Vladimir Oltean <vladimir.oltean@....com>,
Andrew Lunn <andrew@...n.ch>, Roger Quadros <rogerq@...nel.org>,
Richard Cochran
<richardcochran@...il.com>,
Paolo Abeni <pabeni@...hat.com>, Jakub Kicinski
<kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
"David S. Miller"
<davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v6 2/2] net: ethernet: ti: am65-cpsw/ethtool:
Enable RX HW timestamp only for PTP packets
On 17/04/24 17:09, Chintan Vankar wrote:
Due to some issue in my email client other two patches of the series
are missing from this version. I am posting v7 as v6.
> In the current mechanism of timestamping, am65-cpsw-nuss driver
> enables hardware timestamping for all received packets by setting
> the TSTAMP_EN bit in CPTS_CONTROL register, which directs the CPTS
> module to timestamp all received packets, followed by passing
> timestamp via DMA descriptors. This mechanism causes CPSW Port to
> Lock up.
>
> To prevent port lock up, don't enable rx packet timestamping by
> setting TSTAMP_EN bit in CPTS_CONTROL register. The workaround for
> timestamping received packets is to utilize the CPTS Event FIFO
> that records timestamps corresponding to certain events. The CPTS
> module is configured to generate timestamps for Multicast Ethernet,
> UDP/IPv4 and UDP/IPv6 PTP packets.
>
> Update supported hwtstamp_rx_filters values for CPSW's timestamping
> capability.
>
> Fixes: b1f66a5bee07 ("net: ethernet: ti: am65-cpsw-nuss: enable packet timestamping support")
>
> Signed-off-by: Chintan Vankar <c-vankar@...com>
> ---
>
> Link to v5:
> https://lore.kernel.org/r/20240402114405.219100-3-c-vankar@ti.com/
>
> Changes from v5 to v6:
> - No changes in v6.
>
> drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 13 +++++-
> drivers/net/ethernet/ti/am65-cpsw-nuss.c | 51 ++++++++++-----------
> drivers/net/ethernet/ti/am65-cpts.c | 23 ----------
> drivers/net/ethernet/ti/am65-cpts.h | 5 --
> 4 files changed, 35 insertions(+), 57 deletions(-)
>
> diff --git a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
> index d6ce2c9f0a8d..a1d0935d1ebe 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
> +++ b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
> @@ -695,6 +695,17 @@ static int am65_cpsw_get_ethtool_ts_info(struct net_device *ndev,
> struct ethtool_ts_info *info)
> {
> struct am65_cpsw_common *common = am65_ndev_to_common(ndev);
> + unsigned int ptp_v2_filter;
> +
> + ptp_v2_filter = BIT(HWTSTAMP_FILTER_PTP_V2_L4_EVENT) |
> + BIT(HWTSTAMP_FILTER_PTP_V2_L4_SYNC) |
> + BIT(HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) |
> + BIT(HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
> + BIT(HWTSTAMP_FILTER_PTP_V2_L2_SYNC) |
> + BIT(HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ) |
> + BIT(HWTSTAMP_FILTER_PTP_V2_EVENT) |
> + BIT(HWTSTAMP_FILTER_PTP_V2_SYNC) |
> + BIT(HWTSTAMP_FILTER_PTP_V2_DELAY_REQ);
>
> if (!IS_ENABLED(CONFIG_TI_K3_AM65_CPTS))
> return ethtool_op_get_ts_info(ndev, info);
> @@ -708,7 +719,7 @@ static int am65_cpsw_get_ethtool_ts_info(struct net_device *ndev,
> SOF_TIMESTAMPING_RAW_HARDWARE;
> info->phc_index = am65_cpts_phc_index(common->cpts);
> info->tx_types = BIT(HWTSTAMP_TX_OFF) | BIT(HWTSTAMP_TX_ON);
> - info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) | BIT(HWTSTAMP_FILTER_ALL);
> + info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) | ptp_v2_filter;
> return 0;
> }
>
> diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> index bfba883d4fc4..305eda711e0c 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> @@ -103,6 +103,12 @@
> #define AM65_CPSW_PN_TS_CTL_TX_HOST_TS_EN BIT(11)
> #define AM65_CPSW_PN_TS_CTL_MSG_TYPE_EN_SHIFT 16
>
> +#define AM65_CPSW_PN_TS_CTL_RX_ANX_F_EN BIT(0)
> +#define AM65_CPSW_PN_TS_CTL_RX_VLAN_LT1_EN BIT(1)
> +#define AM65_CPSW_PN_TS_CTL_RX_VLAN_LT2_EN BIT(2)
> +#define AM65_CPSW_PN_TS_CTL_RX_ANX_D_EN BIT(3)
> +#define AM65_CPSW_PN_TS_CTL_RX_ANX_E_EN BIT(9)
> +
> /* AM65_CPSW_PORTN_REG_TS_SEQ_LTYPE_REG register fields */
> #define AM65_CPSW_PN_TS_SEQ_ID_OFFSET_SHIFT 16
>
> @@ -126,6 +132,11 @@
> AM65_CPSW_PN_TS_CTL_TX_ANX_E_EN | \
> AM65_CPSW_PN_TS_CTL_TX_ANX_F_EN)
>
> +#define AM65_CPSW_TS_RX_ANX_ALL_EN \
> + (AM65_CPSW_PN_TS_CTL_RX_ANX_D_EN | \
> + AM65_CPSW_PN_TS_CTL_RX_ANX_E_EN | \
> + AM65_CPSW_PN_TS_CTL_RX_ANX_F_EN)
> +
> #define AM65_CPSW_ALE_AGEOUT_DEFAULT 30
> /* Number of TX/RX descriptors */
> #define AM65_CPSW_MAX_TX_DESC 500
> @@ -1044,18 +1055,6 @@ static int am65_cpsw_run_xdp(struct am65_cpsw_common *common,
> return ret;
> }
>
> -static void am65_cpsw_nuss_rx_ts(struct sk_buff *skb, u32 *psdata)
> -{
> - struct skb_shared_hwtstamps *ssh;
> - u64 ns;
> -
> - ns = ((u64)psdata[1] << 32) | psdata[0];
> -
> - ssh = skb_hwtstamps(skb);
> - memset(ssh, 0, sizeof(*ssh));
> - ssh->hwtstamp = ns_to_ktime(ns);
> -}
> -
> /* RX psdata[2] word format - checksum information */
> #define AM65_CPSW_RX_PSD_CSUM_ADD GENMASK(15, 0)
> #define AM65_CPSW_RX_PSD_CSUM_ERR BIT(16)
> @@ -1171,13 +1170,11 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_common *common,
> skb_reserve(skb, headroom);
> }
>
> - /* Pass skb to netstack if no XDP prog or returned XDP_PASS */
> - if (port->rx_ts_enabled)
> - am65_cpsw_nuss_rx_ts(skb, psdata);
> -
> ndev_priv = netdev_priv(ndev);
> am65_cpsw_nuss_set_offload_fwd_mark(skb, ndev_priv->offload_fwd_mark);
> skb_put(skb, pkt_len);
> + if (port->rx_ts_enabled)
> + am65_cpts_rx_timestamp(common->cpts, skb);
> skb_mark_for_recycle(skb);
> skb->protocol = eth_type_trans(skb, ndev);
> am65_cpsw_nuss_rx_csum(skb, csum_info);
> @@ -1730,7 +1727,6 @@ static int am65_cpsw_nuss_ndo_slave_set_mac_address(struct net_device *ndev,
> static int am65_cpsw_nuss_hwtstamp_set(struct net_device *ndev,
> struct ifreq *ifr)
> {
> - struct am65_cpsw_common *common = am65_ndev_to_common(ndev);
> struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
> u32 ts_ctrl, seq_id, ts_ctrl_ltype2, ts_vlan_ltype;
> struct hwtstamp_config cfg;
> @@ -1754,11 +1750,6 @@ static int am65_cpsw_nuss_hwtstamp_set(struct net_device *ndev,
> case HWTSTAMP_FILTER_NONE:
> port->rx_ts_enabled = false;
> break;
> - case HWTSTAMP_FILTER_ALL:
> - case HWTSTAMP_FILTER_SOME:
> - case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
> - case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
> - case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
> case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
> case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
> case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
> @@ -1768,10 +1759,13 @@ static int am65_cpsw_nuss_hwtstamp_set(struct net_device *ndev,
> case HWTSTAMP_FILTER_PTP_V2_EVENT:
> case HWTSTAMP_FILTER_PTP_V2_SYNC:
> case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
> - case HWTSTAMP_FILTER_NTP_ALL:
> port->rx_ts_enabled = true;
> - cfg.rx_filter = HWTSTAMP_FILTER_ALL;
> + cfg.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
> break;
> + case HWTSTAMP_FILTER_ALL:
> + case HWTSTAMP_FILTER_SOME:
> + case HWTSTAMP_FILTER_NTP_ALL:
> + return -EOPNOTSUPP;
> default:
> return -ERANGE;
> }
> @@ -1801,6 +1795,10 @@ static int am65_cpsw_nuss_hwtstamp_set(struct net_device *ndev,
> ts_ctrl |= AM65_CPSW_TS_TX_ANX_ALL_EN |
> AM65_CPSW_PN_TS_CTL_TX_VLAN_LT1_EN;
>
> + if (port->rx_ts_enabled)
> + ts_ctrl |= AM65_CPSW_TS_RX_ANX_ALL_EN |
> + AM65_CPSW_PN_TS_CTL_RX_VLAN_LT1_EN;
> +
> writel(seq_id, port->port_base + AM65_CPSW_PORTN_REG_TS_SEQ_LTYPE_REG);
> writel(ts_vlan_ltype, port->port_base +
> AM65_CPSW_PORTN_REG_TS_VLAN_LTYPE_REG);
> @@ -1808,9 +1806,6 @@ static int am65_cpsw_nuss_hwtstamp_set(struct net_device *ndev,
> AM65_CPSW_PORTN_REG_TS_CTL_LTYPE2);
> writel(ts_ctrl, port->port_base + AM65_CPSW_PORTN_REG_TS_CTL);
>
> - /* en/dis RX timestamp */
> - am65_cpts_rx_enable(common->cpts, port->rx_ts_enabled);
> -
> return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
> }
>
> @@ -1827,7 +1822,7 @@ static int am65_cpsw_nuss_hwtstamp_get(struct net_device *ndev,
> cfg.tx_type = port->tx_ts_enabled ?
> HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
> cfg.rx_filter = port->rx_ts_enabled ?
> - HWTSTAMP_FILTER_ALL : HWTSTAMP_FILTER_NONE;
> + HWTSTAMP_FILTER_PTP_V2_EVENT : HWTSTAMP_FILTER_NONE;
>
> return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? -EFAULT : 0;
> }
> diff --git a/drivers/net/ethernet/ti/am65-cpts.c b/drivers/net/ethernet/ti/am65-cpts.c
> index 599454c1d19f..68891a227dc8 100644
> --- a/drivers/net/ethernet/ti/am65-cpts.c
> +++ b/drivers/net/ethernet/ti/am65-cpts.c
> @@ -866,29 +866,6 @@ static long am65_cpts_ts_work(struct ptp_clock_info *ptp)
> return delay;
> }
>
> -/**
> - * am65_cpts_rx_enable - enable rx timestamping
> - * @cpts: cpts handle
> - * @en: enable
> - *
> - * This functions enables rx packets timestamping. The CPTS can timestamp all
> - * rx packets.
> - */
> -void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en)
> -{
> - u32 val;
> -
> - mutex_lock(&cpts->ptp_clk_lock);
> - val = am65_cpts_read32(cpts, control);
> - if (en)
> - val |= AM65_CPTS_CONTROL_TSTAMP_EN;
> - else
> - val &= ~AM65_CPTS_CONTROL_TSTAMP_EN;
> - am65_cpts_write32(cpts, val, control);
> - mutex_unlock(&cpts->ptp_clk_lock);
> -}
> -EXPORT_SYMBOL_GPL(am65_cpts_rx_enable);
> -
> static int am65_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)
> {
> unsigned int ptp_class = ptp_classify_raw(skb);
> diff --git a/drivers/net/ethernet/ti/am65-cpts.h b/drivers/net/ethernet/ti/am65-cpts.h
> index 90296968a75c..6099d772799d 100644
> --- a/drivers/net/ethernet/ti/am65-cpts.h
> +++ b/drivers/net/ethernet/ti/am65-cpts.h
> @@ -25,7 +25,6 @@ int am65_cpts_phc_index(struct am65_cpts *cpts);
> void am65_cpts_rx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
> void am65_cpts_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
> void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
> -void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en);
> u64 am65_cpts_ns_gettime(struct am65_cpts *cpts);
> int am65_cpts_estf_enable(struct am65_cpts *cpts, int idx,
> struct am65_cpts_estf_cfg *cfg);
> @@ -64,10 +63,6 @@ static inline void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts,
> {
> }
>
> -static inline void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en)
> -{
> -}
> -
> static inline s64 am65_cpts_ns_gettime(struct am65_cpts *cpts)
> {
> return 0;
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