Re: [PATCH v3 5/5] scsi: ufs: Allow UFS host drivers to override the sg entry size

[Christoph Hellwig <hch@infradead.org>]

On Wed, Nov 09, 2022 at 09:29:47AM -0800, Bart Van Assche wrote:
> I'm not sure how to interpret your reply. Anyway, this patch is required to
> use the encryption functionality of the UFS Exynos controller. The
> "vendor-specific fields" text in the patch description refers to the
> encryption fields since these follow the data buffer when using the Exynos
> controller. Although it makes me unhappy that the UFS Exynos controller is
> not compliant with the UFS specification, since it is being used widely I
> think we need support for this controller in the upstream kernel.

The fact that in UFS no one sticks to the standard, and not one but
us in the kernel being more strict and your employer sticking to that
can fix it.

But that's not the point here - the point is that such fields are
always implementation specific and never vendor specific.  Any
particular vendor can, and often does, have various different
implementation specific derivations from or extensions to a spec.

Just like there is no 'vendor' driver as there are plenty different
drivers for the same device class from the same manufacturer.