[dpdk-dev] [PATCH v4 00/11] Port Hotplug Framework

Tetsuya Mukawa mukawa at igel.co.jp
Tue Jan 27 06:01:43 CET 2015


On 2015/01/27 12:00, Qiu, Michael wrote:
> On 1/19/2015 6:42 PM, Tetsuya Mukawa wrote:
>> This patch series adds a dynamic port hotplug framework to DPDK.
>> With the patches, DPDK apps can attach or detach ports at runtime.
>>
>> The basic concept of the port hotplug is like followings.
>> - DPDK apps must have responsibility to manage ports.
>>   DPDK apps only know which ports are attached or detached at the moment.
>>   The port hotplug framework is implemented to allow DPDK apps to manage ports.
>>   For example, when DPDK apps call port attach function, attached port number
>>   will be returned. Also DPDK apps can detach port by port number.
>> - Kernel support is needed for attaching or detaching physical device ports.
>>   To attach new device, the device will be recognized by kernel at first and
>>   controlled by kernel driver. Then user can bind the device to igb_uio
> Here does it really need native kernel driver here? As it will be
> controlled by igb_uio.
> I think even if the device has no kernel driver is also OK.

Thanks for correcting. Yes, it should be.
How about following.

- Kernel support is needed for attaching or detaching physical device ports.
  To attach a new device, the device will be recognized by kernel PCI
hotplug feature at first.
  Then user can bind the device to igb_uio.

>
> Also I have finished initial patch of passthrough driver flag in
> "struct rte_pci_device"
>
> I will send to you after I do some basic test on that, then I will send to
> you, and you can give some comments on that.

I appreciate for your implementing.

Thanks,
Tetsuya


>
> Thanks,
> Michael
>
>>   by 'dpdk_nic_bind.py'. Finally, DPDK apps can call the port hotplug
>>   functions to attach ports.
>>   For detaching, steps are vice versa.
>> - Before detach ports, ports must be stopped and closed.
>>   DPDK application must call rte_eth_dev_stop() and rte_eth_dev_close() before
>>   detaching ports. These function will call finalization codes of PMDs.
>>   But so far, no PMD frees all resources allocated by initialization.
>>   It means PMDs are needed to be fixed to support the port hotplug.
>>   'RTE_PCI_DRV_DETACHABLE' is a new flag indicating a PMD supports detaching.
>>   Without this flag, detaching will be failed.
>> - Mustn't affect legacy DPDK apps.
>>   No DPDK EAL behavior is changed, if the port hotplug functions are't called.
>>   So all legacy DPDK apps can still work without modifications.
>>
>> And a few limitations.
>> - The port hotplug functions are not thread safe.
>>   DPDK apps should handle it.
>> - Only support Linux and igb_uio so far.
>>   BSD and VFIO is not supported. I will send VFIO patches at least, but I don't
>>   have a plan to submit BSD patch so far.
>>
>>
>> Here is port hotplug APIs.
>> -------------------------------------------------------------------------------
>> /**
>>  * Attach a new device.
>>  *
>>  * @param devargs
>>  *   A pointer to a strings array describing the new device
>>  *   to be attached. The strings should be a pci address like
>>  *   '0000:01:00.0' or virtual device name like 'eth_pcap0'.
>>  * @param port_id
>>  *  A pointer to a port identifier actually attached.
>>  * @return
>>  *  0 on success and port_id is filled, negative on error
>>  */
>> int rte_eal_dev_attach(const char *devargs, uint8_t *port_id);
>>
>> /**
>>  * Detach a device.
>>  *
>>  * @param port_id
>>  *   The port identifier of the device to detach.
>>  * @param addr
>>  *  A pointer to a device name actually detached.
>>  * @return
>>  *  0 on success and devname is filled, negative on error
>>  */
>> int rte_eal_dev_detach(uint8_t port_id, char *devname);
>> -------------------------------------------------------------------------------
>>
>> This patch series are for DPDK EAL. To use port hotplug function by DPDK apps,
>> each PMD should be fixed to support 'RTE_PCI_DRV_DETACHABLE' flag. Please check
>> a patch for pcap PMD.
>>
>> Also please check testpmd patch. It will show you how to fix your legacy
>> applications to support port hotplug feature.
>>
>>
>> PATCH v4 changes
>>  - Merge patches to review easier.
>>  - Fix indent of 'if' statement.
>>  - Fix calculation method of eal_compare_pci_addr().
>>  - Fix header file declaration.
>>  - Add header file to determine if hotplug can be enabled.
>>    (Thanks to Qiu, Michael)
>>  - Use braces with 'for' loop.
>>  - Add paramerter checking.
>>  - Fix sanity check code
>>  - Fix comments of rte_eth_dev_type.
>>  - Change function names.
>>    (Thanks to Iremonger, Bernard)
>>
>> PATCH v3 changes:
>>  - Fix enum definition used in rte_ethdev.c.
>>    (Thanks to Zhang, Helin)
>>
>> PATCH v2 changes:
>>  - Replace rte_eal_dev_attach_pdev(), rte_eal_dev_detach_pdev,
>>    rte_eal_dev_attach_vdev() and rte_eal_dev_detach_vdev() to
>>    rte_eal_dev_attach() and rte_eal_dev_detach().
>>  - Add parameter values checking.
>>  - Refashion a few functions.
>>    (Thanks to Iremonger, Bernard)
>>
>> PATCH v1 Changes:
>>  - Fix error checking code of librte_eth APIs.
>>  - Fix issue that port from pcap PMD cannot be detached correctly.
>>  - Fix issue that testpmd could hang after forwarding, if attaching and detaching
>>    is repeatedly.
>>  - Fix if-condition of rte_eth_dev_get_port_by_addr().
>>    (Thanks to Mark Enright)
>>
>> RFC PATCH v2 Changes:
>> - remove 'rte_eth_dev_validate_port()', and cleanup codes.
>>
>>
>> Tetsuya Mukawa (11):
>>   eal/pci,ethdev: Remove assumption that port will not be detached
>>   eal/pci: Consolidate pci address comparison APIs
>>   ethdev: Add rte_eth_dev_free to free specified device
>>   eal,ethdev: Add a function and function pointers to close ether device
>>   ethdev: Add functions that will be used by port hotplug functions
>>   eal/linux/pci: Add functions for unmapping igb_uio resources
>>   eal/pci: Add a function to remove the entry of devargs list
>>   eal/pci: Cleanup pci driver initialization code
>>   ethdev: Add one dev_type paramerter to rte_eth_dev_allocate
>>   eal/pci: Add rte_eal_dev_attach/detach() functions
>>   eal: Enable port hotplug framework in Linux
>>
>>  app/test/virtual_pmd.c                          |   2 +-
>>  config/common_linuxapp                          |   5 +
>>  lib/librte_eal/bsdapp/eal/eal_pci.c             |  16 +-
>>  lib/librte_eal/common/Makefile                  |   1 +
>>  lib/librte_eal/common/eal_common_dev.c          | 273 +++++++++++++++
>>  lib/librte_eal/common/eal_common_devargs.c      |  57 ++++
>>  lib/librte_eal/common/eal_common_pci.c          |  92 ++++-
>>  lib/librte_eal/common/eal_private.h             |  36 ++
>>  lib/librte_eal/common/include/rte_dev.h         |  33 ++
>>  lib/librte_eal/common/include/rte_dev_hotplug.h |  44 +++
>>  lib/librte_eal/common/include/rte_devargs.h     |  18 +
>>  lib/librte_eal/common/include/rte_pci.h         |  76 +++++
>>  lib/librte_eal/linuxapp/eal/Makefile            |   1 +
>>  lib/librte_eal/linuxapp/eal/eal_pci.c           | 136 ++++++--
>>  lib/librte_eal/linuxapp/eal/eal_pci_init.h      |   8 +
>>  lib/librte_eal/linuxapp/eal/eal_pci_uio.c       |  67 +++-
>>  lib/librte_ether/rte_ethdev.c                   | 424 ++++++++++++++++++------
>>  lib/librte_ether/rte_ethdev.h                   | 145 +++++++-
>>  lib/librte_pmd_af_packet/rte_eth_af_packet.c    |   2 +-
>>  lib/librte_pmd_bond/rte_eth_bond_api.c          |   2 +-
>>  lib/librte_pmd_pcap/rte_eth_pcap.c              |   2 +-
>>  lib/librte_pmd_ring/rte_eth_ring.c              |   2 +-
>>  lib/librte_pmd_xenvirt/rte_eth_xenvirt.c        |   2 +-
>>  23 files changed, 1283 insertions(+), 161 deletions(-)
>>  create mode 100644 lib/librte_eal/common/include/rte_dev_hotplug.h
>>




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