linux-kernel - Re: [PATCH net-next v10 03/11] net: ti: prueth: Adds PRUETH HW and SW configuration

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Message-ID: <20250708175301.599c82b8@kernel.org>
Date: Tue, 8 Jul 2025 17:53:01 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Parvathi Pudi <parvathi@...thit.com>
Cc: danishanwar@...com, rogerq@...nel.org, andrew+netdev@...n.ch,
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Subject: Re: [PATCH net-next v10 03/11] net: ti: prueth: Adds PRUETH HW and
 SW configuration

On Wed,  2 Jul 2025 19:36:25 +0530 Parvathi Pudi wrote:
> diff --git a/drivers/net/ethernet/ti/icssm/icssm_prueth.c b/drivers/net/ethernet/ti/icssm/icssm_prueth.c
> index aed5cdc402b5..f52858da89d4 100644
> --- a/drivers/net/ethernet/ti/icssm/icssm_prueth.c
> +++ b/drivers/net/ethernet/ti/icssm/icssm_prueth.c
> +	txcfg = PRUSS_MII_RT_TXCFG_TX_ENABLE |
> +		PRUSS_MII_RT_TXCFG_TX_AUTO_PREAMBLE |
> +		PRUSS_MII_RT_TXCFG_TX_32_MODE_EN |
> +		(TX_START_DELAY << PRUSS_MII_RT_TXCFG_TX_START_DELAY_SHIFT) |
> +		(TX_CLK_DELAY_100M << PRUSS_MII_RT_TXCFG_TX_CLK_DELAY_SHIFT);

> +	/* Min frame length should be set to 64 to allow receive of standard
> +	 * Ethernet frames such as PTP, LLDP that will not have the tag/rct.
> +	 * Actual size written to register is size - 1 per TRM. This also
> +	 * includes CRC/FCS.
> +	 */
> +	txcfg = (((PRUSS_MII_RT_RX_FRMS_MIN_FRM - 1) <<
> +			PRUSS_MII_RT_RX_FRMS_MIN_FRM_SHIFT) &
> +			PRUSS_MII_RT_RX_FRMS_MIN_FRM_MASK);

Please use FIELD_PREP() instead of defining separate _MASK and _SHIFT
values.

> +	/* For EMAC, set Max frame size to 1528 i.e size with VLAN.
> +	 * Actual size written to register is size - 1 as per TRM.
> +	 * Since driver support run time change of protocol, driver
> +	 * must overwrite the values based on Ethernet type.
> +	 */
> +	txcfg |= (((PRUSS_MII_RT_RX_FRMS_MAX_SUPPORT_EMAC - 1) <<
> +			   PRUSS_MII_RT_RX_FRMS_MAX_FRM_SHIFT)	&
> +			   PRUSS_MII_RT_RX_FRMS_MAX_FRM_MASK);

> +struct prueth_queue_desc {
> +	u16 rd_ptr;
> +	u16 wr_ptr;
> +	u8 busy_s;
> +	u8 status;
> +	u8 max_fill_level;
> +	u8 overflow_cnt;
> +} __packed;

Please don't use __packed if the struct will be packed anyway based on
C packing rules.