[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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