linux-kernel - Re: [PATCH net-next v3 1/3] net: stmmac: Add basic dwxgmac4 support to stmmac core

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Message-ID: <20240802143818.GB2504122@kernel.org>
Date: Fri, 2 Aug 2024 15:38:18 +0100
From: Simon Horman <horms@...nel.org>
To: jitendra.vegiraju@...adcom.com
Cc: netdev@...r.kernel.org, alexandre.torgue@...s.st.com,
	joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, mcoquelin.stm32@...il.com,
	bcm-kernel-feedback-list@...adcom.com, richardcochran@...il.com,
	ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
	john.fastabend@...il.com, linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org,
	andrew@...n.ch, linux@...linux.org.uk,
	florian.fainelli@...adcom.com
Subject: Re: [PATCH net-next v3 1/3] net: stmmac: Add basic dwxgmac4 support
 to stmmac core

On Thu, Aug 01, 2024 at 08:18:20PM -0700, jitendra.vegiraju@...adcom.com wrote:
> From: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com>
> 
> Adds support for DWC_xgmac version 4.00a in stmmac core module.
> This version adds enhancements to DMA architecture for virtualization
> scalability. This is realized by decoupling physical DMA channels (PDMA)
> from Virtual DMA channels (VDMA). The  VDMAs are software abastractions
> that map to PDMAs for frame transmission and reception.
> 
> The virtualization enhancements are currently not being used and hence
> a fixed mapping of VDMA to PDMA is configured in the init functions.
> Because of the new init functions, a new instance of struct stmmac_dma_ops
> dwxgmac400_dma_ops is added.
> Most of the other dma operation functions in existing dwxgamc2_dma.c file
> can be reused.
> 
> Signed-off-by: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com>

...

>  stmmac-$(CONFIG_STMMAC_SELFTESTS) += stmmac_selftests.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c

...

> @@ -641,3 +642,33 @@ const struct stmmac_dma_ops dwxgmac210_dma_ops = {
>  	.enable_sph = dwxgmac2_enable_sph,
>  	.enable_tbs = dwxgmac2_enable_tbs,
>  };
> +
> +const struct stmmac_dma_ops dwxgmac400_dma_ops = {
> +	.reset = dwxgmac2_dma_reset,
> +	.init = dwxgmac4_dma_init,
> +	.init_chan = dwxgmac2_dma_init_chan,
> +	.init_rx_chan = dwxgmac4_dma_init_rx_chan,
> +	.init_tx_chan = dwxgmac4_dma_init_tx_chan,
> +	.axi = dwxgmac2_dma_axi,
> +	.dump_regs = dwxgmac2_dma_dump_regs,
> +	.dma_rx_mode = dwxgmac2_dma_rx_mode,
> +	.dma_tx_mode = dwxgmac2_dma_tx_mode,
> +	.enable_dma_irq = dwxgmac2_enable_dma_irq,
> +	.disable_dma_irq = dwxgmac2_disable_dma_irq,
> +	.start_tx = dwxgmac2_dma_start_tx,
> +	.stop_tx = dwxgmac2_dma_stop_tx,
> +	.start_rx = dwxgmac2_dma_start_rx,
> +	.stop_rx = dwxgmac2_dma_stop_rx,
> +	.dma_interrupt = dwxgmac2_dma_interrupt,
> +	.get_hw_feature = dwxgmac2_get_hw_feature,
> +	.rx_watchdog = dwxgmac2_rx_watchdog,
> +	.set_rx_ring_len = dwxgmac2_set_rx_ring_len,
> +	.set_tx_ring_len = dwxgmac2_set_tx_ring_len,
> +	.set_rx_tail_ptr = dwxgmac2_set_rx_tail_ptr,
> +	.set_tx_tail_ptr = dwxgmac2_set_tx_tail_ptr,
> +	.enable_tso = dwxgmac2_enable_tso,
> +	.qmode = dwxgmac2_qmode,
> +	.set_bfsize = dwxgmac2_set_bfsize,
> +	.enable_sph = dwxgmac2_enable_sph,
> +	.enable_tbs = dwxgmac2_enable_tbs,
> +};

Please add dwxgmac400_dma_ops to hwif.h in this patch rather than a
subsequent one to avoid Sparse suggesting the symbol should be static.

...