Kevin Bowling
fa78e1d0b1
Some firmware assigns only one bus number to each PCI-PCI bridge. This prevents later SR-IOV VF enumeration when a VF routing ID falls on a bus number already allocated to a sibling bridge. Reserve only the additional bus numbers required by SR-IOV PFs. Enumerate all directly attached functions before child drivers and bridges attach, inspect their device_t objects for SR-IOV, and grow the PCI bus resource through the highest possible VF routing ID. First VF Offset and VF Stride may change when NumVFs changes. Probe every valid NumVFs value and preserve the original setting. When the upstream hierarchy uses ARI, temporarily enable the SR-IOV ARI Hierarchy control in the lowest-numbered PF while sizing, then restore it. Scope active-VF detection to each conventional PCI slot; an ARI bus remains one slot-0 hierarchy. If firmware left VFs enabled on a device, do not modify it and reserve only its active layout. During runtime configuration, consult the PCI bus's owned resource range rather than PCI-PCI bridge registers. This recognizes an existing boot-time reservation beneath both PCI-PCI and host bridges and avoids a second, overlapping bus-number allocation. This avoids consuming bus numbers behind unrelated bridges. The runtime allocation in pci_iov.c remains as a fallback when the boot-time range cannot be enlarged. hw.pci.clear_buses remains useful when firmware assigned a required number to another bridge before enumeration. Validated the targeted implementation on an Intel E810-XXV behind a non-ARI root port. With hw.pci.clear_buses=1 and no global reserve tunable, the PF bridge received buses 1-2 while three unrelated bridges each received one bus. A VF with First VF Offset 0x100 attached as iavf0 at pci0:2:0:0, and detached cleanly. Reviewed by: jhb, manpages (ziaee) MFC after: 2 weeks Sponsored by: BBOX.io Differential Revision: https://reviews.freebsd.org/D58624
FreeBSD Source:
This is the top level of the FreeBSD source directory.
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), FreeBSD handbook on building userland, and Handbook for kernels for more information, including setting make(1) variables.
For information on the CPU architectures and platforms supported by FreeBSD, see the FreeBSD website's Platforms page.
For official FreeBSD bootable images, see the release page.
Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Source code for third-party software under the Common Development and Distribution License. |
| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see crypto/README). |
| etc | Template files for /etc. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |
| krb5 | Build system for Kerberos 5 (MIT). |
| lib | System libraries. |
| libexec | System commands intended to be executed by other commands or daemons. |
| packages | Base system packages. |
| release | Makefiles and scripts used for building releases and VM images. |
| rescue | Build system for statically linked /rescue commands. |
| sbin | System commands. |
| secure | Build system for cryptographic libraries and commands (excluding Kerberos). |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Tests which can be run by Kyua. See tests/README for additional information. |
| tools | Ancillary utilities and tests (not included in the build). |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see FreeBSD Handbook.