Messages in this thread | | | Date | Thu, 9 Dec 2021 18:41:23 -0800 | From | Jakub Kicinski <> | Subject | Re: [PATCH net-next] net: stmmac: bump tc when get underflow error from DMA descriptor |
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On Thu, 9 Dec 2021 01:31:52 +0000 Joakim Zhang wrote: > > net: stmmac: bump tc when get underflow error from DMA descriptor > > > > In DMA threshold mode, frame underflow errors may sometimes occur > > when the TC(threshold control) value is not enough. The TC value need to be > > bumped up in this case. > > > > There is no underflow interrupt bit on DMA_CH(#i)_Status of dwmac4, so > > the DMA threshold cannot be bumped up in stmmac_dma_interrupt(). The > > i.mx8mp board observed an underflow error while running NFS boot, the > > NFS rootfs could not be mounted. > > > > The underflow error can be got from the DMA descriptor TDES3 on dwmac4. > > This patch bump up tc value once underflow error is got from TDES3. > > > > Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@nxp.com> > > 5 queues with FIFO cut-through mode can work well after applying this patch.
This never worked, correct? It's not a regression fix?
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