linux-kernel - Re: [PATCH iwl-next 5/7] i40e: Consolidate checks whether given VSI is main

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Date: Thu, 21 Mar 2024 10:33:21 +0100
From: Ivan Vecera <ivecera@...hat.com>
To: Paolo Abeni <pabeni@...hat.com>, intel-wired-lan@...ts.osuosl.org
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>,
 Tony Nguyen <anthony.l.nguyen@...el.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH iwl-next 5/7] i40e: Consolidate checks whether given VSI
 is main

On 19. 03. 24 11:17, Paolo Abeni wrote:
> On Mon, 2024-03-18 at 15:30 +0100, Ivan Vecera wrote:
>> In the driver code there are 3 types of checks whether given
>> VSI is main or not:
>> 1. vsi->type ==/!= I40E_VSI_MAIN
>> 2. vsi ==/!= pf->vsi[pf->lan_vsi]
>> 3. vsi->seid ==/!= pf->vsi[pf->lan_vsi]->seid
>>
>> All of them are equivalent and can be consolidated. Convert cases
>> 2 and 3 to case 1.
> 
> Minor nit: while at it, what about introducing an helper for such
> check?
> Reordering the patches you could use it also in i40e_pf_get_main_vsi()

No, I couldn't, that helper does not check vsi->type value:

/**
  * i40e_pf_get_main_vsi - get pointer to main VSI
  * @pf: pointer to a PF
  *
  * Return pointer to main VSI or NULL if it does not exist
  **/
static inline struct i40e_vsi *i40e_pf_get_main_vsi(struct i40e_pf *pf)
{
	return (pf->lan_vsi != I40E_NO_VSI) ? pf->vsi[pf->lan_vsi] : NULL;
}

I had an idea with helper like:
static inline bool i40e_is_main_vsi(struct i40e_vsi *vsi)
{
	struct i40e_pf *pf = vsi->back;
	return (pf->vsi[pf->lan_vsi] == vsi);
}

but I think that `vsi->type == I40E_VSI_MAIN` is simple enough.

Thanks,
Ivan