netdev - Re: [PATCH net-next] enetc: Use generic rule to map Tx rings to interrupt vectors

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Date:   Fri, 9 Apr 2021 18:23:12 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net-next] enetc: Use generic rule to map Tx rings to
 interrupt vectors

On Fri, 9 Apr 2021 13:19:52 +0300 Vladimir Oltean wrote:
> On Fri, Apr 09, 2021 at 10:16:13AM +0300, Claudiu Manoil wrote:
> > Even if the current mapping is correct for the 1 CPU and 2 CPU cases
> > (currently enetc is included in SoCs with up to 2 CPUs only), better
> > use a generic rule for the mapping to cover all possible cases.
> > The number of CPUs is the same as the number of interrupt vectors:
> > 
> > Per device Tx rings -
> > device_tx_ring[idx], where idx = 0..n_rings_total-1
> > 
> > Per interrupt vector Tx rings -
> > int_vector[i].ring[j], where i = 0..n_int_vects-1
> > 			     j = 0..n_rings_per_v-1
> > 
> > Mapping rule -
> > n_rings_per_v = n_rings_total / n_int_vects
> > for i = 0..n_int_vects - 1:
> > 	for j = 0..n_rings_per_v - 1:
> > 		idx = n_int_vects * j + i
> > 		int_vector[i].ring[j] <- device_tx_ring[idx]
> > 
> > Signed-off-by: Claudiu Manoil <claudiu.manoil@....com>
> 
> Tested-by: Vladimir Oltean <vladimir.oltean@....com>

Applied, thanks!