Re: [PATCH v5 01/10] block: add BLK_STS_P2PDMA for unsupported peer-to-peer transfers

> From: Logan Gunthorpe <[email protected]>
> 
> blk_dma_map_iter_start() reports BLK_STS_INVAL when a P2PDMA transfer
> is attempted between two devices whose PCIe topology cannot route it.
> blk_path_error() treats INVAL as retryable, so multipath requeues the
> I/O forever, and callers cannot tell it apart from an invalid request.
> md also ignores it for member failures, so a mirror silently diverges.
> 
> Restoring the old BLK_STS_TARGET would stay ambiguous -- nvme maps
> NS_NOT_READY, LBA_RANGE and CMD_INTERRUPTED to it too.  Add a dedicated
> BLK_STS_P2PDMA, non-retryable in blk_path_error(), and return it from
> blk_dma_map_iter_start().
> 
> Fixes: 858299dc6160 ("block: add scatterlist-less DMA mapping helpers")
> Fixes: 7ce3c1dd78fc ("nvme-pci: convert the data mapping to blk_rq_dma_map")
> Cc: [email protected] # v6.17
> Signed-off-by: Logan Gunthorpe <[email protected]>
> Signed-off-by: Mykola Marzhan <[email protected]>

Sashiko has reviewed this patch and found no issues. It looks great!

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