Re: [PATCH v2 02/17] psp: base PSP device support

On Thu, 26 Jun 2025 10:25:11 -0400 Willem de Bruijn wrote:

Preferable over the following?

	struct psphdr {
		u8      nexthdr;
		u8      hdrlen;
		u8      crypt_offset;

		u8      sample:1;
		u8      drop:1;
		u8	version:4;
		u8	vc_present:1;
		u8	reserved:1;

		__be32  spi;
		__be64  iv;
		__be64  vc[]; /* optional */
	};

I suppose that has an endianness issue requiring
variants with __LITTLE_ENDIAN_BITFIELD and
__BIG_ENDIAN_BITFIELD.

Right, this part. Always gives me pause :(

quoted

quoted

This makes sense with a single physical device plus optional virtual
(vlan, bonding, ..) devices.

It may also be possible for a single physical device (with single
device key) to present multiple PFs and/or VFs. In that case, will
there be multiple struct psp_dev, or will one PF be the "main".  

AFAIU we have no ability to represent multi-PCIe function devices 
in the kernel model today. So realistically I think psp_dev per
function and then propagate the rotation events.  

IDPF does support multiple "vports" (num_alloc_vports), and with that
struct net_device, from a single BDF.

Upstream? If yes then I'm very bad at reviewing code :D