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* [dpdk-dev] [PATCH] eal: map uio resources after hugepages when --base_virtaddr is  configured
@ 2014-11-05  9:49 XU Liang
  2014-11-05  9:58 ` De Lara Guarch, Pablo
  0 siblings, 1 reply; 3+ messages in thread
From: XU Liang @ 2014-11-05  9:49 UTC (permalink / raw)
  To: dev

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When start a secondary process, we got error message "EAL: pci_map_resource(): cannot mmap(11, 0x7ffff7fba000, 0x20000, 0x0): Bad file descriptor (0x7ffff7fb9000)"

The secondary process link difference shared libraries, so the 0x7ffff7fba000 is used. 

We know the --base_virtaddr is designed for this situation for hugepages.

This patch map the device resouce into address that is after hugepages when --base_virtaddr is  configured.

From manoj.viswanath@gmail.com  Wed Nov  5 10:48:52 2014
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From: Manoj Viswanath <manoj.viswanath@gmail.com>
To: dev@dpdk.org
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Subject: [dpdk-dev] Ports not detected by IGB_UIO in DPDK 1.7.1 in QEMU_KVM
	environment
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Hi,

I have a DPDK application running on QEMU-KVM environment using DPDK 1.6.0.
I am trying to port the same to DPDK version 1.7.1.

I am using Virt-manager GUI to assign e1000 emulated port to the VM. This
works fine in DPDK 1.6.0. The device is identified by IGB_UIO and
initialized by my application as expected.

However in case of DPDK 1.7.1, the emulated e1000 devices do not seem to be
recognized.
Following is my analysis:

1. The API pci_get_uio_dev() is returning ERROR. This is called from
pci_uio_map_resource() in the flow of PCI PROBE [rte_eal_pci_probe()].

2. Due to this, the PCI device is not getting mapped to the correct driver
(EM
​ Driver​
).

3. The reason for the error in [1] appears to be that "uio" sub-directory
doesn't seem to be correctly created for interfaces assigned to this VM.

4. Upon further analysis i found that IGB_UIO probe function
["igbuio_pci_probe()"] is not getting triggered indicating the port has *not
been assigned* to the IGB_UIO.

Kindly refer to the attachments:-
- "Output of sys-bus-pci-devices" - indicating "uio" subdirectory not
created for PCI devices in case of DPDK 1.7.1
- "Output of lspci -v" - indicating device not bound to driver in case of
DPDK 1.7.1
- IGB_UIO init log snippet - indicating PCI devices not detected and
initialized by IGB_UIO in case of DPDK 1.7.1
- CONFIG file used for DPDK compilation

Not sure what has changed between 1.6.0 and 1.7.1 which is impacting this.

Could someone throw light in this regard as to what i may be missing ?

Thanks in advance.

Regards,
Manoj

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^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-11-05 10:29 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-11-05  9:49 [dpdk-dev] [PATCH] eal: map uio resources after hugepages when --base_virtaddr is configured XU Liang
2014-11-05  9:58 ` De Lara Guarch, Pablo
2014-11-05 10:38   ` Thomas Monjalon

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