[PATCH] nvme-pci: place chain addresses in iod

[Christoph Hellwig]

On Tue, Dec 20, 2022 at 10:21:31AM -0800, Keith Busch wrote:
> -#define NVME_MAX_KB_SZ	4096
> -#define NVME_MAX_SEGS	127
> +#define NVME_MAX_KB_SZ	8192
> +#define NVME_MAX_SEGS	128
> +#define NVME_MAX_CHAINS	5

NVME_MAX_CHAINS sounds a bit odd.  Maybe MAX_ALLOCATIONS to match
the nr_allocations field?

>  
>  static int use_threaded_interrupts;
>  module_param(use_threaded_interrupts, int, 0444);
> @@ -232,6 +233,7 @@ struct nvme_iod {
>  	dma_addr_t first_dma;
>  	dma_addr_t meta_dma;
>  	struct sg_table sgt;
> +	void *list[NVME_MAX_CHAINS];

I think this should a union nvme_data_ptr * so that we have some typing
information.