| Message ID | 1454016364-30985-39-git-send-email-troy.kisky@boundarydevices.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 00c9b7e..8372d9b 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -1608,9 +1608,10 @@ static int fec_enet_napi_q1(struct napi_struct *napi, int budget) } writel(events, fep->hwp + FEC_IEVENT); - if (events & FEC_ENET_RXF_0) - pkts += fec_rxq(ndev, fep, fep->rx_queue[0], - budget - pkts); + /* don't check FEC_ENET_RXF_0, to recover from a full queue + * but bit clear condition + */ + pkts += fec_rxq(ndev, fep, fep->rx_queue[0], budget - pkts); if (events & FEC_ENET_TXF_0) fec_txq(ndev, fep, fep->tx_queue[0]); } while (pkts < budget);
The following is true of linux-3.14. I have not been able to verify on mainline, because I cannot get the cpuidle driver to work. If gpio6 workaround is not used for interrupts, then it is possible for the entire receive queue to become full without an interrupt. If that happens, and the last rxf_0 interrupt is lost, then the FEC can no longer receive packets. However packet transmission is still fine, so the tx watchdog will never fire. The only way to recover before this is a ifconfig down/up. Skipping the FEC_ENET_RXF_0 check will allow the rx queue to recover from the condition when the next packet is transmitted. This patch also has the advantage of increasing iperf speed. Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com> --- drivers/net/ethernet/freescale/fec_main.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)