linux-kernel - Re: [PATCH iwl-net] i40e: Fix waiting for queues of all VSIs to be disabled

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Message-ID: <0a203988-1062-4dc8-96f6-cab800c03026@intel.com>
Date:   Wed, 8 Nov 2023 09:54:07 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Ivan Vecera <ivecera@...hat.com>,
        <intel-wired-lan@...ts.osuosl.org>
CC:     Wojciech Drewek <wojciech.drewek@...el.com>,
        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>,
        Paolo Abeni <pabeni@...hat.com>,
        "Jeff Kirsher" <jeffrey.t.kirsher@...el.com>,
        Neerav Parikh <neerav.parikh@...el.com>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH iwl-net] i40e: Fix waiting for queues of all VSIs to be
 disabled



On 11/8/2023 8:01 AM, Ivan Vecera wrote:
> The function i40e_pf_wait_queues_disabled() iterates all PF's VSIs
> up to 'pf->hw.func_caps.num_vsis' but this is incorrect because
> the real number of VSIs can be up to 'pf->num_alloc_vsi' that
> can be higher. Fix this loop.

This confused me at first, but as described in i40e_probe:

>         /* The number of VSIs reported by the FW is the minimum guaranteed
>          * to us; HW supports far more and we share the remaining pool with
>          * the other PFs. We allocate space for more than the guarantee with
>          * the understanding that we might not get them all later.
>          */
>         if (pf->hw.func_caps.num_vsis < I40E_MIN_VSI_ALLOC)
>                 pf->num_alloc_vsi = I40E_MIN_VSI_ALLOC;
>         else
>                 pf->num_alloc_vsi = pf->hw.func_caps.num_vsis;

The func_caps.num_vsis is really a minimum guaranteed amount and a
single PF could get more from the shared pool.

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>

> 
> Fixes: 69129dc39fac ("i40e: Modify Tx disable wait flow in case of DCB reconfiguration")
> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 6a2907674583..de19d753ba83 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -5340,7 +5340,7 @@ static int i40e_pf_wait_queues_disabled(struct i40e_pf *pf)
>  {
>  	int v, ret = 0;
>  
> -	for (v = 0; v < pf->hw.func_caps.num_vsis; v++) {
> +	for (v = 0; v < pf->num_alloc_vsi; v++) {
>  		if (pf->vsi[v]) {
>  			ret = i40e_vsi_wait_queues_disabled(pf->vsi[v]);
>  			if (ret)