netdev - Re: [PATCH net-next v10 4/7] net: tn40xx: add basic Tx handling

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Date: Thu, 13 Jun 2024 17:30:38 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: netdev@...r.kernel.org, andrew@...n.ch, horms@...nel.org,
 jiri@...nulli.us, pabeni@...hat.com, linux@...linux.org.uk,
 hfdevel@....net, naveenm@...vell.com, jdamato@...tly.com
Subject: Re: [PATCH net-next v10 4/7] net: tn40xx: add basic Tx handling

On Tue, 11 Jun 2024 13:52:14 +0900 FUJITA Tomonori wrote:
> +static void tn40_init_txd_sizes(void)
> +{
> +	int i, lwords;
> +
> +	if (tn40_txd_sizes[0].bytes)
> +		return;
> +
> +	/* 7 - is number of lwords in txd with one phys buffer
> +	 * 3 - is number of lwords used for every additional phys buffer
> +	 */
> +	for (i = 0; i < TN40_MAX_PBL; i++) {
> +		lwords = 7 + (i * 3);
> +		if (lwords & 1)
> +			lwords++;	/* pad it with 1 lword */
> +		tn40_txd_sizes[i].qwords = lwords >> 1;
> +		tn40_txd_sizes[i].bytes = lwords << 2;
> +	}
> +}

Since this initializes global data - you should do it in module init.
Due to this you can't rely on module_pci_driver(), you gotta write
the module init / exit functions by hand.