Thanks a lot, Jim. I've opened SPDK issue #1605 to track this, and the mail is forwarded to dev(a)dpdk.org. Thanks -Niu On 2020/9/28, 11:44 PM, "Harris, James R" <james.r.harris(a)intel.com&gt; wrote: Hi Niu, I agree, this doesn't look right. Could you file an SPDK issue for this to make sure we track it? And then try sending an e-mail to the DPDK mailing list? I'm open to submitting a patch to our DPDK submodule short-term, but only if we get agreement with DPDK community that this fix is correct. Thanks, Jim On 9/28/20, 12:17 AM, "Niu, Yawei" <yawei.niu(a)intel.com&gt; wrote: Hi, In the pci_unplug() (dpdk/drivers/bus/pci/pci_common.c), why do we call rte_devargs_remove() to remove the saved device args? That looks a defect to me, since that’ll result in the hot removed device failed to be detected when it’s plugged back (when white list option was provided), the situation is described following: 1. App starts with white list option provided, let’s suppose the device in white list is: 0000:81:00.0; 2. rte_devargs_add() is called to add this device arg on rte_eal_init(); 3. Issue “echo 1 > /sys/bus/pci/devices/0000\:81\:00.0/remove” to hot remove the device; 4. pci_unplug() is called to remove the device, and rte_devargs_remove() is called, so this device arg for white list is remove too; 5. Issue “echo 1 > /sys/bus/pci/rescan” then “PCI_WHITELIST=”0000:81:00.0” spdk/script/setup.sh” to do hot plug; 6. In pci_scan_one(), new dev is generated, however, the dev->device.devargs is set NULL since the device args has been removed on device unplug; 7. rte_pci_probe() does white list scan, however, it unexpectedly skips the device because the devargs of the device is NULL now; I don’t fully understand the DPDK code, but this rte_devargs_remove() in pci_unplug() doesn’t make sense to me (when I commented it out, seems everything will work as expected). Is this a glitch or I missed anything? Thanks -Niu _______________________________________________ SPDK mailing list -- spdk(a)lists.01.org To unsubscribe send an email to spdk-leave(a)lists.01.org _______________________________________________ SPDK mailing list -- spdk(a)lists.01.org To unsubscribe send an email to spdk-leave(a)lists.01.org