Re: [RFC PATCH net-next 4/4] net: ti: icssg_prueth: add TAPRIO offload support

[Roger Quadros <rogerq@kernel.org>]

On 30/08/2023 14:08, MD Danish Anwar wrote:
> From: Roger Quadros <rogerq@kernel.org>
> 
> ICSSG dual-emac f/w supports Enhanced Scheduled Traffic (EST – defined
> in P802.1Qbv/D2.2 that later got included in IEEE 802.1Q-2018)
> configuration. EST allows express queue traffic to be scheduled
> (placed) on the wire at specific repeatable time intervals. In
> Linux kernel, EST configuration is done through tc command and
> the taprio scheduler in the net core implements a software only
> scheduler (SCH_TAPRIO). If the NIC is capable of EST configuration,
> user indicate "flag 2" in the command which is then parsed by
> taprio scheduler in net core and indicate that the command is to
> be offloaded to h/w. taprio then offloads the command to the
> driver by calling ndo_setup_tc() ndo ops. This patch implements
> ndo_setup_tc() to offload EST configuration to ICSSG.
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
> Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
> ---
>  drivers/net/ethernet/ti/Makefile             |   3 +-
>  drivers/net/ethernet/ti/icssg/icssg_prueth.c |   5 +-
>  drivers/net/ethernet/ti/icssg/icssg_prueth.h |   7 +
>  drivers/net/ethernet/ti/icssg/icssg_qos.c    | 294 +++++++++++++++++++
>  drivers/net/ethernet/ti/icssg/icssg_qos.h    | 119 ++++++++
>  5 files changed, 426 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/net/ethernet/ti/icssg/icssg_qos.c
>  create mode 100644 drivers/net/ethernet/ti/icssg/icssg_qos.h
> 
> diff --git a/drivers/net/ethernet/ti/Makefile b/drivers/net/ethernet/ti/Makefile
> index 3adceff760ce..de348c20eff9 100644
> --- a/drivers/net/ethernet/ti/Makefile
> +++ b/drivers/net/ethernet/ti/Makefile
> @@ -38,5 +38,6 @@ icssg-prueth-y := k3-cppi-desc-pool.o \
>  		  icssg/icssg_mii_cfg.o \
>  		  icssg/icssg_stats.o \
>  		  icssg/icssg_ethtool.o \
> -		  icssg/icssg_switchdev.o
> +		  icssg/icssg_switchdev.o \
> +		  icssg/icssg_qos.o
>  obj-$(CONFIG_TI_ICSS_IEP) += icssg/icss_iep.o
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> index 5b7e7297ce23..3236af45aa4e 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> @@ -1179,7 +1179,7 @@ static int emac_phy_connect(struct prueth_emac *emac)
>  	return 0;
>  }
>  
> -static u64 prueth_iep_gettime(void *clockops_data, struct ptp_system_timestamp *sts)
> +u64 prueth_iep_gettime(void *clockops_data, struct ptp_system_timestamp *sts)
>  {
>  	u32 hi_rollover_count, hi_rollover_count_r;
>  	struct prueth_emac *emac = clockops_data;
> @@ -1416,6 +1416,8 @@ static int emac_ndo_open(struct net_device *ndev)
>  		napi_enable(&emac->tx_chns[i].napi_tx);
>  	napi_enable(&emac->napi_rx);
>  
> +	icssg_qos_init(ndev);
> +
>  	/* start PHY */
>  	phy_start(ndev->phydev);
>  
> @@ -1695,6 +1697,7 @@ static const struct net_device_ops emac_netdev_ops = {
>  	.ndo_set_rx_mode = emac_ndo_set_rx_mode,
>  	.ndo_eth_ioctl = emac_ndo_ioctl,
>  	.ndo_get_stats64 = emac_ndo_get_stats64,
> +	.ndo_setup_tc = icssg_qos_ndo_setup_tc,
>  };
>  
>  /* get emac_port corresponding to eth_node name */
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.h b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> index 6e18da06c786..43b67213d8c7 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> @@ -37,6 +37,7 @@
>  #include "icssg_config.h"
>  #include "icss_iep.h"
>  #include "icssg_switch_map.h"
> +#include "icssg_qos.h"
>  
>  #define PRUETH_MAX_MTU          (2000 - ETH_HLEN - ETH_FCS_LEN)
>  #define PRUETH_MIN_PKT_SIZE     (VLAN_ETH_ZLEN)
> @@ -186,6 +187,9 @@ struct prueth_emac {
>  	struct devlink_port devlink_port;
>  	int port_vlan;
>  
> +	struct prueth_qos qos;
> +	struct work_struct ts_work;
> +
>  	struct delayed_work stats_work;
>  	u64 stats[ICSSG_NUM_STATS];
>  };
> @@ -331,4 +335,7 @@ void icssg_set_pvid(struct prueth *prueth, u8 vid, u8 port);
>  void emac_stats_work_handler(struct work_struct *work);
>  void emac_update_hardware_stats(struct prueth_emac *emac);
>  int emac_get_stat_by_name(struct prueth_emac *emac, char *stat_name);
> +
> +u64 prueth_iep_gettime(void *clockops_data, struct ptp_system_timestamp *sts);
> +
>  #endif /* __NET_TI_ICSSG_PRUETH_H */
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_qos.c b/drivers/net/ethernet/ti/icssg/icssg_qos.c
> new file mode 100644
> index 000000000000..e8102703e257
> --- /dev/null
> +++ b/drivers/net/ethernet/ti/icssg/icssg_qos.c
> @@ -0,0 +1,294 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Texas Instruments ICSSG PRUETH QoS submodule
> + * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/

2023 here and rest of series.

> + */
> +
> +#include <linux/printk.h>
> +#include "icssg_prueth.h"
> +#include "icssg_switch_map.h"
> +
> +static void icssg_qos_tas_init(struct net_device *ndev);
> +
> +void icssg_qos_init(struct net_device *ndev)
> +{
> +	icssg_qos_tas_init(ndev);
> +
> +	/* IET init goes here */

Please drop this comment.

> +}
> +

<snip>

-- 
cheers,
-roger