On 27.02.2015 20:42, Nelson, Shannon wrote: >> From: nick [mailto:xerofo...@gmail.com] >> On 2015-02-27 09:16 AM, Stefan Assmann wrote: >>> On 27.02.2015 15:02, nick wrote: >>> >>> [...] >>> >>>>> i40e: Fix a bug where Rx would stop after some time >>>>> [...] >>>>> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c >> b/drivers/net/ethernet/intel/i40e/i40e_main.c >>>>> index f7464e8..ff6d94d 100644 >>>>> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c >>>>> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c >>>>> [...] >>>>> @@ -9169,6 +9178,13 @@ static int i40e_probe(struct pci_dev *pdev, >> const struct pci_device_id *ent) >>>>> if (err) >>>>> dev_info(&pf->pdev->dev, "set phy mask fail, aq_err %d\n", >> err); >>>>> >>>>> + msleep(75); >>>>> + err = i40e_aq_set_link_restart_an(&pf->hw, true, NULL); >>>>> + if (err) { >>>>> + dev_info(&pf->pdev->dev, "link restart failed, aq_err=%d\n", >>>>> + pf->hw.aq.asq_last_status); >>>>> + } >>>>> + >>>>> /* The main driver is (mostly) up and happy. We need to set this >> state >>>>> * before setting up the misc vector or we get a race and the >> vector >>>>> * ends up disabled forever. >>>>> >>>>> With this hunk removed the driver successfully unloaded/reloaded a >>>>> couple of hundred times. Would it be safe to just remove this hunk? >>>>> I haven't seen any negative effects by removing this yet. >>>>> >>>>> Stefan >>>>> >>>> Stefan, >>>> I wouldn't remove them yet as this does look like a valid idea to >> check to see if the link is >>>> restarting successfully. On the other hand can you try removing the >> msleep line as this one is >>>> most likely causing the issue due to sleeping for some long in a >> probe function is generally a >>>> bad idea. >>>> Thanks, >>>> Nick >>> >>> Thanks Nick for the quick reply. I tested removing the msleep but that >>> didn't make a difference. You actually need to remove the complete >> hunk >>> to get a stable driver reload. >>> >>> Stefan >>> >> Stefan, >> Basically there are a few things that could be going wrong >> 1. You are getting a error return for the >> function,i40e_aq_set_link_restart_an >> 2. You are trying to re able the device again when not needed >> 3. You are sending a NULL value to a field for command arguments that >> takes a 0 and not NULL >> to take no arguments >> Nick > > First of all, I would make sure you've got a short sleep in between each load > and unload in this stress test. There's a lot going on under the covers in > the Firmware that really should be allowed to settle out before jostling it > again with another load/unload command.
If a short delay is needed I think this should be implemented by the driver. Triggering this kind of bug from userspace shouldn't be possible. I'm using this reload loop regularly on driver backports to test for regressions. Btw, I noticed this problem during a normal reboot and used the reloading while looking for a reproducer. > It would help to know what Firmware you have on your NIC - can you give us > the output from "ethtool -i <ethX>"? # ethtool -i eth6 driver: i40e version: 1.2.9-k firmware-version: f4.22 a1.1 n04.26 e800014b1 bus-info: 0000:07:00.0 supports-statistics: yes supports-test: yes supports-eeprom-access: yes supports-register-dump: yes supports-priv-flags: yes > The out-of-tree driver has just (finally!) been updated on SourceForge, so > you might give this version 1.2.37 driver a try to see if it changes your > result. That code still has the hunk in question, but protected by a FW > version check. The related patch will be headed upstream to net-next very > soon. 1.2.37 fails the same way. > Firmware updates have also just been released, but I'm not sure they've made > it to the Intel Downloads site yet. Updating your FW will make a difference. If you could point me to the firmware updates and instructions I can perform the update. Thanks! Stefan ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
