netdev - Re: [RFC net-next v2 3/5] net: phy: nxp-c45-tja11xx add MACsec support

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Date: Fri, 25 Aug 2023 15:50:06 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Radu Pirea (OSS)" <radu-nicolae.pirea@....nxp.com>
Cc: Sabrina Dubroca <sd@...asysnail.net>, hkallweit1@...il.com,
	linux@...linux.org.uk, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, richardcochran@...il.com,
	sebastian.tobuschat@....com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC net-next v2 3/5] net: phy: nxp-c45-tja11xx add MACsec
 support

> > > > +static bool nxp_c45_rx_sc_valid(struct nxp_c45_secy *phy_secy,
> > > > +				struct macsec_rx_sc *rx_sc)
> > > > +{
> > > > +	u16 port =  (__force u64)rx_sc->sci >> (ETH_ALEN * 8);
> > > 
> > > u64 sci = be64_to_cpu((__force __be64)rx_sc->sci);
> > 
> > why is the __force needed? What happens with a normal cast?
> > 
> 
> Sparse will print warnings if __force is missing.

What is the warning? I just want to make sure __force is the correct
solution, not that something has the wrong type and we should be
fixing a design issue.

       Andrew