On Thu, Nov 21, 2019 at 03:38:04PM +0800, Kai-Heng Feng wrote: > Hi, > > Currently there are two quirks for Dell TB16 to workaround an issue: > "xhci: Bad Ethernet performance plugged in ASM1042A host", and > "r8152: disable RX aggregation on Dell TB16 dock". > > However, the issue wasn't analyzed and root caused. I'd like to understand what's really going on here. > Reverting those two patches, and as soon as doing TX/RX over the ethernet on TB16, xhci_hcd errors out: > > [ 69.803804] xhci_hcd 0000:3f:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13 > [ 69.803807] xhci_hcd 0000:3f:00.0: Looking for event-dma 000000047c4b1010 trb-start 000000047c4b0fe0 trb-end 000000047c4b0fe0 seg-start 000000047c4b0000 seg-end 000000047c4b0ff0 > [ 69.803900] xhci_hcd 0000:3f:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13 > [ 69.803901] xhci_hcd 0000:3f:00.0: Looking for event-dma 000000047c4b1020 trb-start 000000047c4b0fe0 trb-end 000000047c4b0fe0 seg-start 000000047c4b0000 seg-end 000000047c4b0ff0 > [ 69.803998] xhci_hcd 0000:3f:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13 > [ 69.803999] xhci_hcd 0000:3f:00.0: Looking for event-dma 000000047c4b1030 trb-start 000000047c4b0fe0 trb-end 000000047c4b0fe0 seg-start 000000047c4b0000 seg-end 000000047c4b0ff0 > [ 69.804096] xhci_hcd 0000:3f:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13 > [ 69.804099] xhci_hcd 0000:3f:00.0: Looking for event-dma 000000047c4b1040 trb-start 000000047c4b0fe0 trb-end 000000047c4b0fe0 seg-start 000000047c4b0000 seg-end 000000047c4b0ff0 > [ 69.955830] xhci_hcd 0000:3f:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13 > [ 69.955847] xhci_hcd 0000:3f:00.0: Looking for event-dma 000000047c4b1050 trb-start 000000047c4b0fe0 trb-end 000000047c4b0fe0 seg-start 000000047c4b0000 seg-end 000000047c4b0ff0 > [ 69.956704] xhci_hcd 0000:3f:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13 > [ 69.956718] xhci_hcd 0000:3f:00.0: Looking for event-dma 000000047c4b1060 trb-start 000000047c4b0fe0 trb-end 000000047c4b0fe0 seg-start 000000047c4b0000 seg-end 000000047c4b0ff0 > [ 69.963802] xhci_hcd 0000:3f:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13 > [ 69.963819] xhci_hcd 0000:3f:00.0: Looking for event-dma 000000047c4b1070 trb-start 000000047c4b0fe0 trb-end 000000047c4b0fe0 seg-start 000000047c4b0000 seg-end 000000047c4b0ff0 > [ 70.112302] xhci_hcd 0000:3f:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13 > [ 70.112321] xhci_hcd 0000:3f:00.0: Looking for event-dma 000000047c4b1080 trb-start 000000047c4b0fe0 trb-end 000000047c4b0fe0 seg-start 000000047c4b0000 seg-end 000000047c4b0ff0 > > So, under what circumstances the DMA pointer can be out of the TD? What kernel version are you running that causes these errors? thanks, greg k-h
