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

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Date: Sat, 15 Jun 2024 09:44:31 +0200
From: Hans-Frieder Vogt <hfdevel@....net>
To: Jakub Kicinski <kuba@...nel.org>,
 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,
 naveenm@...vell.com, jdamato@...tly.com
Subject: Re: [PATCH net-next v10 4/7] net: tn40xx: add basic Tx handling

On 14.06.2024 02.30, Jakub Kicinski wrote:

> 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.
I would rather move tn40_txd_sizes into tn40_priv and initialize it at
probe-time. Just thinking what will happen if there is more than one
tn40 card in a computer. Then a driver-based global struct would lead to
all sorts of problems.