linux-kernel - Re: [PATCH net-next v3 4/6] net: ti: icssg-prueth: Enable HSR Tx Packet duplication offload

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Message-ID: <7ebd7657-8e79-44e4-9680-832946fab523@kernel.org>
Date: Fri, 30 Aug 2024 16:30:09 +0300
From: Roger Quadros <rogerq@...nel.org>
To: MD Danish Anwar <danishanwar@...com>, Andrew Lunn <andrew@...n.ch>,
 Dan Carpenter <dan.carpenter@...aro.org>, Jan Kiszka
 <jan.kiszka@...mens.com>, Javier Carrasco <javier.carrasco.cruz@...il.com>,
 Jacob Keller <jacob.e.keller@...el.com>, Diogo Ivo <diogo.ivo@...mens.com>,
 Simon Horman <horms@...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,
 linux-arm-kernel@...ts.infradead.org, srk@...com,
 Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH net-next v3 4/6] net: ti: icssg-prueth: Enable HSR Tx
 Packet duplication offload



On 28/08/2024 12:18, MD Danish Anwar wrote:
> From: Ravi Gunasekaran <r-gunasekaran@...com>
> 
> The HSR stack allows to offload its Tx packet duplication functionality to
> the hardware. Enable this offloading feature for ICSSG driver
> 
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
> Signed-off-by: MD Danish Anwar <danishanwar@...com>
> ---
>  drivers/net/ethernet/ti/icssg/icssg_common.c | 13 ++++++++++---
>  drivers/net/ethernet/ti/icssg/icssg_prueth.c |  5 +++--
>  drivers/net/ethernet/ti/icssg/icssg_prueth.h |  2 ++
>  3 files changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
> index b9d8a93d1680..2d6d8648f5a9 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_common.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
> @@ -660,14 +660,15 @@ enum netdev_tx icssg_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev
>  {
>  	struct cppi5_host_desc_t *first_desc, *next_desc, *cur_desc;
>  	struct prueth_emac *emac = netdev_priv(ndev);
> +	struct prueth *prueth = emac->prueth;
>  	struct netdev_queue *netif_txq;
>  	struct prueth_tx_chn *tx_chn;
>  	dma_addr_t desc_dma, buf_dma;
> +	u32 pkt_len, dst_tag_id;
>  	int i, ret = 0, q_idx;
>  	bool in_tx_ts = 0;
>  	int tx_ts_cookie;
>  	void **swdata;
> -	u32 pkt_len;
>  	u32 *epib;
>  
>  	pkt_len = skb_headlen(skb);
> @@ -712,9 +713,15 @@ enum netdev_tx icssg_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev
>  
>  	/* set dst tag to indicate internal qid at the firmware which is at
>  	 * bit8..bit15. bit0..bit7 indicates port num for directed
> -	 * packets in case of switch mode operation
> +	 * packets in case of switch mode operation and port num 0
> +	 * for undirected packets in case of HSR offload mode
>  	 */
> -	cppi5_desc_set_tags_ids(&first_desc->hdr, 0, (emac->port_id | (q_idx << 8)));
> +	dst_tag_id = emac->port_id | (q_idx << 8);
> +
> +	if (prueth->is_hsr_offload_mode && (ndev->features & NETIF_F_HW_HSR_DUP))
> +		dst_tag_id = PRUETH_UNDIRECTED_PKT_DST_TAG;
> +
> +	cppi5_desc_set_tags_ids(&first_desc->hdr, 0, dst_tag_id);
>  	k3_udma_glue_tx_dma_to_cppi5_addr(tx_chn->tx_chn, &buf_dma);
>  	cppi5_hdesc_attach_buf(first_desc, buf_dma, pkt_len, buf_dma, pkt_len);
>  	swdata = cppi5_hdesc_get_swdata(first_desc);
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> index f4fd346fe6f5..b60efe7bd7a7 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> @@ -41,7 +41,8 @@
>  #define DEFAULT_PORT_MASK	1
>  #define DEFAULT_UNTAG_MASK	1
>  
> -#define NETIF_PRUETH_HSR_OFFLOAD_FEATURES	NETIF_F_HW_HSR_FWD
> +#define NETIF_PRUETH_HSR_OFFLOAD_FEATURES	(NETIF_F_HW_HSR_FWD | \
> +						 NETIF_F_HW_HSR_DUP)

You mentioned that these 2 features can't be enabled individually.

So better to squash this with previous patch and use ndo_fix_features() to make sure both
are set or cleared together.

>  
>  /* CTRLMMR_ICSSG_RGMII_CTRL register bits */
>  #define ICSSG_CTRL_RGMII_ID_MODE                BIT(24)
> @@ -897,7 +898,7 @@ static int prueth_netdev_init(struct prueth *prueth,
>  	ndev->ethtool_ops = &icssg_ethtool_ops;
>  	ndev->hw_features = NETIF_F_SG;
>  	ndev->features = ndev->hw_features;
> -	ndev->hw_features |= NETIF_F_HW_HSR_FWD;
> +	ndev->hw_features |= NETIF_PRUETH_HSR_OFFLOAD_FEATURES;
>  
>  	netif_napi_add(ndev, &emac->napi_rx, icssg_napi_rx_poll);
>  	hrtimer_init(&emac->rx_hrtimer, CLOCK_MONOTONIC,
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.h b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> index a4b025fae797..e110a5f92684 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> @@ -59,6 +59,8 @@
>  
>  #define IEP_DEFAULT_CYCLE_TIME_NS	1000000	/* 1 ms */
>  
> +#define PRUETH_UNDIRECTED_PKT_DST_TAG	0
> +
>  /* Firmware status codes */
>  #define ICSS_HS_FW_READY 0x55555555
>  #define ICSS_HS_FW_DEAD 0xDEAD0000	/* lower 16 bits contain error code */

-- 
cheers,
-roger