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xCAT Network Boot Agent
744b98d273
The virtnet_transmit() logic for waiting the packet to be transmitted is reversed: we can't wait the packet to be transmitted if we didn't kick() the ring yet. The vring_more_used() while loop logic is reversed also, that explains why the code works today. The current code risks trying to free a buffer from the used ring when none was available, that will happen most times because KVM doesn't handle the packet immediately on kick(). Luckily it was working because it was unlikely to have a buffer still queued for transmit when virtnet_transmit() was called. Also, adds a BUG_ON() to vring_get_buf(), to catch cases where we try to free a buffer from the used ring when there was none available. Patch for Etherboot. gPXE has the same problem on the code, but I hadn't a chance to test gPXE using virtio-net yet. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com> |
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gPXE README File gPXE is an implementation of the PXE specification for network booting, with extensions to allow additional features such as booting via HTTP, iSCSI, and AoE. In generally, gPXE is compatible with the industry-standard PXE specification, and also supports Etherboot .nbi file loading and some additional protocols and features. For more detailed information about gPXE, please visit our project website at: http://etherboot.org/ BUILDING gPXE IMAGE FROM SOURCE If you don't want to install development tools, and have access to the Web, you can get gPXE and Etherboot ROM images made on demand from http://rom-o-matic.net/ If you would like to compile gPXE images from source, here are some tips. We normally compile gPXE images on x86, 32-bit Linux machines. It is possible to also use x86-64 machines. We use gcc compiler options to create 32-bit output. It is important to have the necessary software packages installed. A gcc-based toolchain is required. The following packages (at least) are required: - a gcc tool chain (gcc 3.x or gcc 4.x) - binutils - perl - syslinux - mtools To test your environment, cd to the "src" directory and type: make You should see a lot of output, and when it stops, the "bin" directory should be populated with gPXE images and object files. To learn more about what to build and how to use gPXE, please visit our project website at http://etherboot.org/ , particularly the "howto" section. CONTACTING US Pointers to our project mailing lists are on http://etherboot.org/ Real-time help is often available on IRC on the #etherboot channel of irc.freenode.net.