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]h"]h$]h&]uh1j~hj/ubeh}(h]h ]h"]h$]h&]uh1jihhhKhj,hhubjj)}(hhh](jo)}(h作者h]h作者}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1jnhjahhhKubj)}(hC- Yu Zhao - Donald Dutile h]h bullet_list)}(hhh](h list_item)}(hYu Zhao h]jN)}(hjh](h Yu Zhao <}(hjhhhNhNubj)}(hyu.zhao@intel.comh]hyu.zhao@intel.com}(hjhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:yu.zhao@intel.comuh1jhjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jMhhhKhj}ubah}(h]h ]h"]h$]h&]uh1j{hjxubj|)}(h#Donald Dutile h]jN)}(h"Donald Dutile h](hDonald Dutile <}(hjhhhNhNubj)}(hddutile@redhat.comh]hddutile@redhat.com}(hjhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:ddutile@redhat.comuh1jhjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jMhhhKhjubah}(h]h ]h"]h$]h&]uh1j{hjxubeh}(h]h ]h"]h$]h&]bullet-uh1jvhhhKhjrubah}(h]h ]h"]h$]h&]uh1j~hjaubeh}(h]h ]h"]h$]h&]uh1jihhhKhj,hhubeh}(h]h ]h"]h$]h&]uh1jdhjhhhhhKubj)}(hhh](j)}(h概述h]h概述}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjhhhhhKubj)}(hhh](j)}(h什么是SR-IOVh]h什么是SR-IOV}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjhhhhhKubjN)}(hX单根I/O虚拟化(SR-IOV)是一种PCI Express扩展功能,它使一个物理设备显示为多个 虚拟设备。物理设备被称为物理功能(PF),而虚拟设备被称为虚拟功能(VF)。VF的分 配可以由PF通过封装在该功能中的寄存器动态控制。默认情况下,该功能未被启用,PF表 现为传统的PCIe设备。一旦开启,每个VF的PCI配置空间都可以通过自己的总线、设备和 功能编号(路由ID)来访问。而且每个VF也有PCI内存空间,用于映射其寄存器集。VF设 备驱动程序对寄存器集进行操作,这样它就可以发挥功能,并作为一个真正的现有PCI设备 出现。h]hX单根I/O虚拟化(SR-IOV)是一种PCI Express扩展功能,它使一个物理设备显示为多个 虚拟设备。物理设备被称为物理功能(PF),而虚拟设备被称为虚拟功能(VF)。VF的分 配可以由PF通过封装在该功能中的寄存器动态控制。默认情况下,该功能未被启用,PF表 现为传统的PCIe设备。一旦开启,每个VF的PCI配置空间都可以通过自己的总线、设备和 功能编号(路由ID)来访问。而且每个VF也有PCI内存空间,用于映射其寄存器集。VF设 备驱动程序对寄存器集进行操作,这样它就可以发挥功能,并作为一个真正的现有PCI设备 出现。}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKhjhhubeh}(h]sr-iovah ]h"]什么是sr-iovah$]h&]uh1jhjhhhhhKubeh}(h]id1ah ]h"]概述ah$]h&]uh1jhjhhhhhKubj)}(hhh](j)}(h 使用指南h]h 使用指南}(hj1hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj.hhhhhK(ubj)}(hhh](j)}(h!我怎样才能启用SR-IOV功能h]h!我怎样才能启用SR-IOV功能}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1jhj?hhhhhK+ubjN)}(hX-有多种方法可用于SR-IOV的启用。在第一种方法中,设备驱动(PF驱动)将通过SR-IOV 核心提供的API控制功能的启用和禁用。如果硬件具有SR-IOV能力,加载其PF驱动器将启 用它和与PF相关的所有VF。一些PF驱动需要设置一个模块参数,以确定要启用的VF的数量。 在第二种方法中,对sysfs文件sriov_numvfs的写入将启用和禁用与PCIe PF相关的VF。 这种方法实现了每个PF的VF启用/禁用值,而第一种方法则适用于同一设备的所有PF。此外, PCI SRIOV核心支持确保启用/禁用操作是有效的,以减少同一检查在多个驱动程序中的重 复,例如,如果启用VF,检查numvfs == 0,确保numvfs <= totalvfs。 第二种方法是对新的/未来的VF设备的推荐方法。h]hX-有多种方法可用于SR-IOV的启用。在第一种方法中,设备驱动(PF驱动)将通过SR-IOV 核心提供的API控制功能的启用和禁用。如果硬件具有SR-IOV能力,加载其PF驱动器将启 用它和与PF相关的所有VF。一些PF驱动需要设置一个模块参数,以确定要启用的VF的数量。 在第二种方法中,对sysfs文件sriov_numvfs的写入将启用和禁用与PCIe PF相关的VF。 这种方法实现了每个PF的VF启用/禁用值,而第一种方法则适用于同一设备的所有PF。此外, PCI SRIOV核心支持确保启用/禁用操作是有效的,以减少同一检查在多个驱动程序中的重 复,例如,如果启用VF,检查numvfs == 0,确保numvfs <= totalvfs。 第二种方法是对新的/未来的VF设备的推荐方法。}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhK-hj?hhubeh}(h]id3ah ]h"]!我怎样才能启用sr-iov功能ah$]h&]uh1jhj.hhhhhK+ubj)}(hhh](j)}(h!我怎样才能使用虚拟功能h]h!我怎样才能使用虚拟功能}(hjihhhNhNubah}(h]h ]h"]h$]h&]uh1jhjfhhhhhK7ubjN)}(h在内核中,VF被视为热插拔的PCI设备,所以它们应该能够以与真正的PCI设备相同的方式 工作。VF需要的设备驱动与普通PCI设备的驱动相同。h]h在内核中,VF被视为热插拔的PCI设备,所以它们应该能够以与真正的PCI设备相同的方式 工作。VF需要的设备驱动与普通PCI设备的驱动相同。}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhK9hjfhhubeh}(h]id4ah ]h"]!我怎样才能使用虚拟功能ah$]h&]uh1jhj.hhhhhK7ubeh}(h]id2ah ]h"] 使用指南ah$]h&]uh1jhjhhhhhK(ubj)}(hhh](j)}(h开发者指南h]h开发者指南}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjhhhhhK=ubj)}(hhh](j)}(h SR-IOV APIh]h SR-IOV API}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjhhhhhK@ubjN)}(h用来开启SR-IOV功能:h]h用来开启SR-IOV功能:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKBhjhhubhenumerated_list)}(hhh]j|)}(hl对于第一种方法,在驱动程序中:: int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn); h](jN)}(h,对于第一种方法,在驱动程序中::h]h+对于第一种方法,在驱动程序中:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKDhjubh literal_block)}(h9int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);h]h9int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKFhjubeh}(h]h ]h"]h$]h&]uh1j{hjhhhhhNubah}(h]h ]h"]h$]h&]enumtype loweralphaprefix(suffix)uh1jhjhhhhhKDubjN)}(h'nr_virtfn'是要启用的VF的编号。h]h)nr_virtfn’是要启用的VF的编号。}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKHhjhhubj)}(hhh]j|)}(h对于第二种方法,从sysfs:: echo 'nr_virtfn' > \ /sys/bus/pci/devices//sriov_numvfs h](jN)}(h"对于第二种方法,从sysfs::h]h!对于第二种方法,从sysfs:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKJhjubj)}(hSecho 'nr_virtfn' > \ /sys/bus/pci/devices//sriov_numvfsh]hSecho 'nr_virtfn' > \ /sys/bus/pci/devices//sriov_numvfs}hj!sbah}(h]h ]h"]h$]h&]hhuh1jhhhKLhjubeh}(h]h ]h"]h$]h&]uh1j{hj hhhhhNubah}(h]h ]h"]h$]h&]jjjjjjstartKuh1jhjhhhhhKJubjN)}(h用来关闭SR-IOV功能:h]h用来关闭SR-IOV功能:}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKOhjhhubj)}(hhh](j|)}(h_对于第一种方法,在驱动程序中:: void pci_disable_sriov(struct pci_dev *dev); h](jN)}(h,对于第一种方法,在驱动程序中::h]h+对于第一种方法,在驱动程序中:}(hjQhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKQhjMubj)}(h,void pci_disable_sriov(struct pci_dev *dev);h]h,void pci_disable_sriov(struct pci_dev *dev);}hj_sbah}(h]h ]h"]h$]h&]hhuh1jhhhKShjMubeh}(h]h ]h"]h$]h&]uh1j{hjJhhhhhNubj|)}(hw对于第二种方法,从sysfs:: echo 0 > \ /sys/bus/pci/devices//sriov_numvfs h](jN)}(h"对于第二种方法,从sysfs::h]h!对于第二种方法,从sysfs:}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKUhjsubj)}(hJecho 0 > \ /sys/bus/pci/devices//sriov_numvfsh]hJecho 0 > \ /sys/bus/pci/devices//sriov_numvfs}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKWhjsubeh}(h]h ]h"]h$]h&]uh1j{hjJhhhhhNubeh}(h]h ]h"]h$]h&]jjjjjjuh1jhjhhhhhKQubjN)}(h要想通过主机上的兼容驱动启用自动探测VF,在启用SR-IOV功能之前运行下面的命令。这 是默认的行为。 ::h]h要想通过主机上的兼容驱动启用自动探测VF,在启用SR-IOV功能之前运行下面的命令。这 是默认的行为。}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKZhjhhubj)}(hTecho 1 > \ /sys/bus/pci/devices//sriov_drivers_autoprobeh]hTecho 1 > \ /sys/bus/pci/devices//sriov_drivers_autoprobe}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhK^hjhhubjN)}(h要禁止主机上的兼容驱动自动探测VF,请在启用SR-IOV功能之前运行以下命令。更新这个 入口不会影响已经被探测的VF。 ::h]h要禁止主机上的兼容驱动自动探测VF,请在启用SR-IOV功能之前运行以下命令。更新这个 入口不会影响已经被探测的VF。}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKahjhhubj)}(hUecho 0 > \ /sys/bus/pci/devices//sriov_drivers_autoprobeh]hUecho 0 > \ /sys/bus/pci/devices//sriov_drivers_autoprobe}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKehjhhubeh}(h] sr-iov-apiah ]h"] sr-iov apiah$]h&]uh1jhjhhhhhK@ubj)}(hhh](j)}(h用例h]h用例}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjhhhhhKiubjN)}(h.下面的代码演示了SR-IOV API的用法 ::h]h+下面的代码演示了SR-IOV API的用法}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jMhhhKkhjhhubj)}(hXstatic int dev_probe(struct pci_dev *dev, const struct pci_device_id *id) { pci_enable_sriov(dev, NR_VIRTFN); ... return 0; } static void dev_remove(struct pci_dev *dev) { pci_disable_sriov(dev); ... } static int dev_suspend(struct device *dev) { ... return 0; } static int dev_resume(struct device *dev) { ... return 0; } static void dev_shutdown(struct pci_dev *dev) { ... } static int dev_sriov_configure(struct pci_dev *dev, int numvfs) { if (numvfs > 0) { ... pci_enable_sriov(dev, numvfs); ... return numvfs; } if (numvfs == 0) { .... pci_disable_sriov(dev); ... return 0; } } static struct pci_driver dev_driver = { .name = "SR-IOV Physical Function driver", .id_table = dev_id_table, .probe = dev_probe, .remove = dev_remove, .driver.pm = &dev_pm_ops .shutdown = dev_shutdown, .sriov_configure = dev_sriov_configure, };h]hXstatic int dev_probe(struct pci_dev *dev, const struct pci_device_id *id) { pci_enable_sriov(dev, NR_VIRTFN); ... return 0; } static void dev_remove(struct pci_dev *dev) { pci_disable_sriov(dev); ... } static int dev_suspend(struct device *dev) { ... return 0; } static int dev_resume(struct device *dev) { ... return 0; } static void dev_shutdown(struct pci_dev *dev) { ... } static int dev_sriov_configure(struct pci_dev *dev, int numvfs) { if (numvfs > 0) { ... pci_enable_sriov(dev, numvfs); ... return numvfs; } if (numvfs == 0) { .... pci_disable_sriov(dev); ... return 0; } } static struct pci_driver dev_driver = { .name = "SR-IOV Physical Function driver", .id_table = dev_id_table, .probe = dev_probe, .remove = dev_remove, .driver.pm = &dev_pm_ops .shutdown = dev_shutdown, .sriov_configure = dev_sriov_configure, };}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKnhjhhubeh}(h]id6ah ]h"]用例ah$]h&]uh1jhjhhhhhKiubeh}(h]id5ah ]h"]开发者指南ah$]h&]uh1jhjhhhhhK=ubeh}(h](pci-express-i-ojeh ]h"](pci express i/o 虚拟化指南cn_pci-iov-howtoeh$]h&]uh1jhhhhhhhKexpect_referenced_by_name}j" j sexpect_referenced_by_id}jj subeh}(h]h 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