netdev - Re: [PATCH net-next] net: ethernet: mtk_ppe: add MTK_FOE_ENTRY_V{1,2}

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Date: Fri, 21 Jul 2023 07:52:51 +0100
From: Simon Horman <simon.horman@...igine.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, nbd@....name, john@...ozen.org,
	sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
	lorenzo.bianconi@...hat.com, daniel@...rotopia.org
Subject: Re: [PATCH net-next] net: ethernet: mtk_ppe: add
 MTK_FOE_ENTRY_V{1,2}_SIZE macros

On Thu, Jul 20, 2023 at 10:52:15PM +0200, Lorenzo Bianconi wrote:
> > On Wed, Jul 19, 2023 at 12:29:49PM +0200, Lorenzo Bianconi wrote:
> > > Introduce MTK_FOE_ENTRY_V{1,2}_SIZE macros in order to make more
> > > explicit foe_entry size for different chipset revisions.
> > > 
> > > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> > > ---
> > >  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 10 +++++-----
> > >  drivers/net/ethernet/mediatek/mtk_ppe.h     |  3 +++
> > >  2 files changed, 8 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> > > index 834c644b67db..7f9e23ddb3c4 100644
> > > --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> > > +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> > > @@ -4811,7 +4811,7 @@ static const struct mtk_soc_data mt7621_data = {
> > >  	.required_pctl = false,
> > >  	.offload_version = 1,
> > >  	.hash_offset = 2,
> > > -	.foe_entry_size = sizeof(struct mtk_foe_entry) - 16,
> > > +	.foe_entry_size = MTK_FOE_ENTRY_V1_SIZE,
> > >  	.txrx = {
> > >  		.txd_size = sizeof(struct mtk_tx_dma),
> > >  		.rxd_size = sizeof(struct mtk_rx_dma),
> > 
> > ...
> > 
> > > @@ -4889,8 +4889,8 @@ static const struct mtk_soc_data mt7981_data = {
> > >  	.required_pctl = false,
> > >  	.offload_version = 2,
> > >  	.hash_offset = 4,
> > > -	.foe_entry_size = sizeof(struct mtk_foe_entry),
> > >  	.has_accounting = true,
> > > +	.foe_entry_size = MTK_FOE_ENTRY_V2_SIZE,
> > >  	.txrx = {
> > >  		.txd_size = sizeof(struct mtk_tx_dma_v2),
> > >  		.rxd_size = sizeof(struct mtk_rx_dma_v2),
> > 
> > ...
> > 
> > > diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.h b/drivers/net/ethernet/mediatek/mtk_ppe.h
> > > index e51de31a52ec..fb6bf58172d9 100644
> > > --- a/drivers/net/ethernet/mediatek/mtk_ppe.h
> > > +++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
> > > @@ -216,6 +216,9 @@ struct mtk_foe_ipv6_6rd {
> > >  	struct mtk_foe_mac_info l2;
> > >  };
> > >  
> > > +#define MTK_FOE_ENTRY_V1_SIZE	80
> > > +#define MTK_FOE_ENTRY_V2_SIZE	96
> > 
> > Hi Lorenzo,
> > 
> > Would it make sense to define these in terms of sizeof(struct mtk_foe_entry) ?
> > 
> 
> Hi Simon,
> 
> I was discussing with Felix to have something like:
> 
> struct mtk_foe_entry_v1 {
> 	u32 data[19];
> };
> 
> struct mtk_foe_entry_v2 {
> 	u32 data[23];
> };
> 
> struct mtk_foe_entry {
> 	u32 ib1;
> 
> 	union {
> 		...
> 		struct mtk_foe_entry_v1 e;
> 		struct mtk_foe_entry_v2 e2;
> 	};
> };
> 
> and then relying on sizeof of struct mtk_foe_entry_v1/mtk_foe_entry_v2
> but then we decided to have a simpler approach. What do you think?

Hi Lorenzo,

I do see some value in something like what you have above.
But I also appreciate the value of simplicity.

So I have no objections if you prefer the patch in it's current form.

Reviewed-by: Simon Horman <simon.horman@...igine.com>