| Message ID | 20240904103116.4022152-1-jacky_chou@aspeedtech.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: ftgmac100: Enable TX interrupt to avoid TX timeout | expand |
On Wed, Sep 04, 2024 at 06:31:16PM +0800, Jacky Chou wrote: > Currently, the driver only enables RX interrupt to handle RX > packets and TX resources. Sometimes there is not RX traffic, > so the TX resource needs to wait for RX interrupt to free. > This situation will toggle the TX timeout watchdog when the MAC > TX ring has no more resources to transmit packets. > Therefore, enable TX interrupt to release TX resources at any time. This looks reasonable. FTGMAC100_INT_ALL is used when NAPI polling is not being used, so the extra interrupts should not cause additional load. Is this a fix? How easy is it to trigger the issue? Andrew
On Wed, 4 Sep 2024 18:31:16 +0800 Jacky Chou wrote: > Currently, the driver only enables RX interrupt to handle RX > packets and TX resources. Sometimes there is not RX traffic, > so the TX resource needs to wait for RX interrupt to free. > This situation will toggle the TX timeout watchdog when the MAC > TX ring has no more resources to transmit packets. > Therefore, enable TX interrupt to release TX resources at any time. Please answer Andrew's question (preferably send a v2 with the answer as part of the commit message). Add a fixes tag, I think this is where the bug was added? Fixes: 10cbd6407609 ("ftgmac100: Rework NAPI & interrupts handling") And when you send v2, please make sure to CC the author (Benjamin).
On Fri, Sep 06, 2024 at 01:57:56AM +0000, Jacky Chou wrote: > Hello, > > When I am verifying iperf3 over UDP, the network hangs. > Like the log below. > > root# iperf3 -c 192.168.100.100 -i1 -t10 -u -b0 > Connecting to host 192.168.100.100, port 5201 > [ 4] local 192.168.100.101 port 35773 connected to 192.168.100.100 port 5201 > [ ID] Interval Transfer Bandwidth Total Datagrams > [ 4] 0.00-20.42 sec 160 KBytes 64.2 Kbits/sec 20 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > [ 4] 20.42-20.42 sec 0.00 Bytes 0.00 bits/sec 0 > - - - - - - - - - - - - - - - - - - - - - - - - - > [ ID] Interval Transfer Bandwidth Jitter Lost/Total > Datagrams > [ 4] 0.00-20.42 sec 160 KBytes 64.2 Kbits/sec 0.000 ms 0/20 (0%) > [ 4] Sent 20 datagrams > iperf3: error - the server has terminated The network topology is FTGMAC > connects directly to a PC. UDP does not need to wait for ACK, unlike TCP. > Therefore, FTGMAC needs to enable TX interrupt to release TX resources instead > of waiting for the RX interrupt. Please don't top post. So this does seem like a fix. Please read through: https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html You need a Fixes: tag, CC: stable tag, use the correct tree, etc. Andrew --- pw-bot: cr
diff --git a/drivers/net/ethernet/faraday/ftgmac100.h b/drivers/net/ethernet/faraday/ftgmac100.h index 63b3e02fab16..4968f6f0bdbc 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.h +++ b/drivers/net/ethernet/faraday/ftgmac100.h @@ -84,7 +84,7 @@ FTGMAC100_INT_RPKT_BUF) /* All the interrupts we care about */ -#define FTGMAC100_INT_ALL (FTGMAC100_INT_RPKT_BUF | \ +#define FTGMAC100_INT_ALL (FTGMAC100_INT_RXTX | \ FTGMAC100_INT_BAD) /*
Currently, the driver only enables RX interrupt to handle RX packets and TX resources. Sometimes there is not RX traffic, so the TX resource needs to wait for RX interrupt to free. This situation will toggle the TX timeout watchdog when the MAC TX ring has no more resources to transmit packets. Therefore, enable TX interrupt to release TX resources at any time. Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com> --- drivers/net/ethernet/faraday/ftgmac100.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)