netdev - Re: [PATCH net-next v3 10/10] net: ti: icssg-prueth: Add ICSSG Ethernet driver for AM65x SR1.0 platforms

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Date: Tue, 27 Feb 2024 17:31:36 +0000
From: Simon Horman <horms@...nel.org>
To: Diogo Ivo <diogo.ivo@...mens.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, danishanwar@...com, rogerq@...nel.org,
	vigneshr@...com, arnd@...db.de, wsa+renesas@...g-engineering.com,
	vladimir.oltean@....com, andrew@...n.ch, dan.carpenter@...aro.org,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	jan.kiszka@...mens.com
Subject: Re: [PATCH net-next v3 10/10] net: ti: icssg-prueth: Add ICSSG
 Ethernet driver for AM65x SR1.0 platforms

On Tue, Feb 27, 2024 at 12:05:14PM +0000, Diogo Ivo wrote:
> On 2/22/24 13:31, Simon Horman wrote:
> > On Wed, Feb 21, 2024 at 03:24:16PM +0000, Diogo Ivo wrote:
> > > Add the PRUeth driver for the ICSSG subsystem found in AM65x SR1.0 devices.
> > > The main differences that set SR1.0 and SR2.0 apart are the missing TXPRU
> > > core in SR1.0, two extra DMA channels for management purposes and different
> > > firmware that needs to be configured accordingly.
> > > 
> > > Based on the work of Roger Quadros, Vignesh Raghavendra and
> > > Grygorii Strashko in TI's 5.10 SDK [1].
> > > 
> > > [1]: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.ti.com%2Fcgit%2Fti-linux-kernel%2Fti-linux-kernel%2Ftree%2F%3Fh%3Dti-linux-5.10.y&data=05%7C02%7Cdiogo.ivo%40siemens.com%7Cfebc5e0f6a1b476c366d08dc33aa89ee%7C38ae3bcd95794fd4addab42e1495d55a%7C1%7C0%7C638442054773860177%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=YxcCwUMV7Zzyycb1Ss6xoCq9BK1vYsvuoF30XXA2tRI%3D&reserved=0
> > > 
> > > Co-developed-by: Jan Kiszka <jan.kiszka@...mens.com>
> > > Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> > > Signed-off-by: Diogo Ivo <diogo.ivo@...mens.com>
> > 
> > ...
> > 
> > > diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
> > 
> > ...
> > 
> 
> ...
> 
> > > +	config.rx_flow_id = emac->rx_flow_id_base; /* flow id for host port */
> > > +	config.rx_mgr_flow_id = emac->rx_mgm_flow_id_base; /* for mgm ch */
> > > +	config.rand_seed = get_random_u32();
> > 
> > Hi Diogo and Jan,
> > 
> > The fields of config above are all __le32.
> > However the last three lines above assign host byte-order values to these
> > fields. This does not seem correct.
> > 
> > This is flagged by Sparse along with some problems.
> > Please ensure that new Sparse warnings are not introduced.
> > 
> 
> You are correct, thank you for catching the inconsistency, this will be
> fixed in v4.
> 
> ...
> 
> > > +static int emac_send_command_sr1(struct prueth_emac *emac, u32 cmd)
> > > +{
> > > +	dma_addr_t desc_dma, buf_dma;
> > > +	struct prueth_tx_chn *tx_chn;
> > > +	struct cppi5_host_desc_t *first_desc;
> > > +	u32 *data = emac->cmd_data;
> > > +	u32 pkt_len = sizeof(emac->cmd_data);
> > > +	void **swdata;
> > > +	int ret = 0;
> > > +	u32 *epib;
> > 
> > In new Networking code please express local variables in reverse xmas tree
> > order - longest line to shortest.
> 
> Noted, will fix for v4.
> 
> ...
> 
> > There is also one such problem in Patch 06/10.
> Here xmastree reported the same problem in patch 08/10 rather than 06/10, I
> assumed you meant that one.

Yes, probably.

Thanks.