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* Enable RX interrupts
@ 2021-11-01  5:50 Jack Humphries
  2021-11-01  7:46 ` Dmitry Kozlyuk
  2021-11-01 15:20 ` Stephen Hemminger
  0 siblings, 2 replies; 7+ messages in thread
From: Jack Humphries @ 2021-11-01  5:50 UTC (permalink / raw)
  To: users

Hi folks,

Hope all are well. I’m trying to enable interrupts in DPDK so that my network receive thread can sleep on an epoll until packets arrive. I am using the ixgbe kernel driver and igb_uio userspace driver with an Intel 82599ES 10Gbps NIC.

I'm doing roughly the following to enable the interrupts, but the epoll never indicates that packets have arrived. The thread only handles packets when the epoll times out. I don't even see interrupts arrive from the device when monitoring /proc/interrupts.

port_conf.intr_conf.rxq = 1;

...

CHECK_EQ(rte_eth_dev_rx_intr_ctl_q(kPort, kQueue, RTE_EPOLL_PER_THREAD,
                                   RTE_INTR_EVENT_ADD, nullptr),
         0); 
CHECK_EQ(rte_eth_dev_rx_intr_enable(kPort, kQueue), 0);

...

rte_epoll_event event;
while (true) {
  int n = rte_epoll_wait(RTE_EPOLL_PER_THREAD, &event, /*maxevents=*/1,
                         /*timeout=*/1000);
  if (n == 0) {
    // Timeout expired.
  } else {
    // Received RX interrupt.
  }
}

Given that I don't see anything coming through in /proc/interrupts, I am going to start digging through the ixgbe driver. However, I wanted to ask here first to see if my setup is missing anything obvious. I based it closely on the l3fwd-power example, though I haven't been able to get that example up and running yet since my NIC only has one port plugged in right now and the example requires two (COVID building restrictions).

Thanks,
Jack Humphries

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2021-11-06 15:12 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-11-01  5:50 Enable RX interrupts Jack Humphries
2021-11-01  7:46 ` Dmitry Kozlyuk
2021-11-01  8:56   ` Jack Humphries
2021-11-06 15:12     ` Thomas Monjalon
2021-11-01 15:20 ` Stephen Hemminger
2021-11-01 19:16   ` Jack Humphries
2021-11-01 19:51     ` Stephen Hemminger

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