Hi, On 18.12.2016 19:30, Pavel Machek wrote: > Hi! > >> > - e1efa87241272104d6a12c8b9fcdc4f62634d447 >> >> Yep, a sync of the dma descriptors before the hardware gets ownership of the >> tx tail >> idx is missing in the stmmac, too. > > I can reproduce failure with 4.4 fairly easily. I tried with dma_ > variant of barriers, and it failed, too > > [ 1018.410012] stmmac: early irq > [ 1023.939702] fpga_cmd_read:wait_event timed out! > [ 1033.128692] ------------[ cut here ]------------ > [ 1033.133329] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:303 > dev_watchdog+0x264/0x284() > [ 1033.141748] NETDEV WATCHDOG: eth0 (socfpga-dwmac): transmit queue 0 > timed out > [ 1033.148861] Modules linked in:
This watchdog warning clearly says that for some reason the tx queue was stopped but never woken up in a certain timespan (5 sec in our case, which is a lot). Does this occur after the queue has been stopped and woken up again a few times or is it already the first time the queue is stopped (and never woken up)? Regards, Lino
