RE: [EXT] Re: [PATCH net-next] net: stmmac: bump tc when get underflow error from DMA descriptor

On Fri, 11 Dec 2021 00:07:13 Jakub Kicinski wrote:

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5 queues with FIFO cut-through mode can work well after applying this

patch.

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This never worked, correct? It's not a regression fix?

Yes, it's never worked when the underflow error is observed in the
case of NFS boot on i.mx8mp. I'm not sure if other SoC have same issue
in this case, but I think it's necessary to increase the threshold
value in case of underflow error.

Oh, so NFS boot works for the most part on i.mx8mp but under certain
conditions (or with certain configuration?) this error can be observed and the
boot will fail?

Yes, when configure the DMA as threshold mode, this error can be observed.

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Do you mean that I need to send the patch as a bug fix to net branch?

Your call, if you would like for the patch to go to stable and LTS releases -- then
it need to be resent for net with a Fixes tag.

LMK if you prefer net or net-next.

Because this error requires a certain condition in DTS file, and I haven't update the DTS file. So I prefer to add the patch in net-next, thanks.