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SubjectRe: [PATCH 6/7] PCI: Make sure VF's driver get attached after PF's
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On Tue, May 14, 2013 at 2:46 AM, Perla, Sathya <Sathya.Perla@emulex.com> wrote:
>
>> -----Original Message-----
>> From: linux-pci-owner@vger.kernel.org [mailto:linux-pci-
>> owner@vger.kernel.org] On Behalf Of Yinghai Lu
>>
>> Found kernel try to load mlx4 drivers for VFs before PF's is really loaded
>> when the drivers are built-in, and kernel command line include
>> probe_vfs=63, num_vfs=63.
>>
>> It turns that it also happen for hotadd path even drivers are compiled as
>> modules and if they loaded. Esp some VF share the same driver with PF.
>>
>> calling path:
>> device driver probe
>> ==> pci_enable_sriov
>> ==> virtfn_add
>> ==> pci_dev_add
>> ==> pci_bus_device_add
>> when pci_bus_device_add is called, the VF's driver will be attached.
>> and at that time PF's driver does not finish yet.
>>
>> Need to move out pci_bus_device_add from virtfn_add and call it later. Fix
>> the problem for two path, 1. hotadd path: use device_schedule_callback.
>> 2. for booting path, use initcall to call that for all VF's.
>>
>
> ...
>>
>> Index: linux-2.6/drivers/net/ethernet/emulex/benet/be_main.c
>> ==========================================================
>> =========
>> --- linux-2.6.orig/drivers/net/ethernet/emulex/benet/be_main.c
>> +++ linux-2.6/drivers/net/ethernet/emulex/benet/be_main.c
>> @@ -4119,6 +4119,7 @@ static int lancer_recover_func(struct be
>> if (status)
>> goto err;
>>
>> + pci_bus_add_device_vfs(adapter->pdev);
>> if (netif_running(adapter->netdev)) {
>> status = be_open(adapter->netdev);
>> if (status)
>> @@ -4335,6 +4336,8 @@ static int be_probe(struct pci_dev *pdev
>> dev_info(&pdev->dev, "%s: %s %s port %c\n", nic_name(pdev),
>> func_name(adapter), mc_name(adapter), port_name);
>>
>> + pci_bus_add_device_vfs(pdev);
>> +
>> return 0;
>>
>> unsetup:
>> @@ -4406,6 +4409,7 @@ static int be_resume(struct pci_dev *pde
>> rtnl_unlock();
>> }
>>
>> + pci_bus_add_device_vfs(adapter->pdev);
>> schedule_delayed_work(&adapter->func_recovery_work,
>> msecs_to_jiffies(1000));
>> netif_device_attach(netdev);
>
> I fixed this issue in be2net with the following patch (commit b4c1df93)
> http://marc.info/?l=linux-netdev&m=136801459808765&w=2

We should fix that in generic way.

BTW, Can you please implement sriov_configure like
intel igb, ixgbe
qlogic: qlcnic
...

driver really should not call pci_enable_sriov in probe path.

Yinghai


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