On Tue, 16 Oct 2018 22:37:31 +0200 Heiner Kallweit <hkallwe...@gmail.com> wrote:
> rtl_rx() and rtl_tx() are called only if the respective bits are set > in the interrupt status register. Under high load NAPI may not be > able to process all data (work_done == budget) and it will schedule > subsequent calls to the poll callback. > rtl_ack_events() however resets the bits in the interrupt status > register, therefore subsequent calls to rtl8169_poll() won't call > rtl_rx() and rtl_tx() - chip interrupts are still disabled. > > Fix this by calling rtl_rx() and rtl_tx() independent of the bits > set in the interrupt status register. Both functions will detect > if there's nothing to do for them. > > This issue has been there more or less forever (at least it exists in > 3.16 already), so I can't provide a "Fixes" tag. > > Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com> Another issue is this: if (work_done < budget) { napi_complete_done(napi, work_done); rtl_irq_enable(tp, enable_mask); mmiowb(); } return work_done; } The code needs to check return value of napi_complete_done. if (work_done < budget && napi_complete_done(napi, work_done) { rtl_irq_enable(tp, enable_mask); mmiowb(); } return work_done; } Try that, it might fix the problem and your logic would be unnecessary