096b31fc0d
When receiving packets, netvsp puts data in a buffer mapped through UIO. Depending on packet size, netvsc may attach the buffer as an external mbuf. This is not a problem if this mbuf is consumed in the application, and the application can correctly read data out of an external mbuf. However, there are two problems with data in an external mbuf. 1. Due to the limitation of the kernel UIO implementation, physical address of this external buffer is not exposed to the user-mode. If this mbuf is passed to another driver, the other driver is unable to map this buffer to iova. 2. Some DPDK applications are not aware of external mbuf, and may bug when they receive an mbuf with external buffer attached. Introduce a driver parameter "rx_extmbuf_enable" to control if netvsc should use external mbuf for receiving packets. The default value is 0. (netvsc doesn't use external mbuf, it always allocates mbuf and copy data to mbuf) A non-zero value tells netvsc to attach external buffers to mbuf on receiving packets, thus avoid copying memory. Signed-off-by: Long Li <longli@microsoft.com> |
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| app | ||
| buildtools | ||
| config | ||
| devtools | ||
| doc | ||
| drivers | ||
| examples | ||
| kernel | ||
| lib | ||
| license | ||
| usertools | ||
| .editorconfig | ||
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| .gitignore | ||
| .travis.yml | ||
| ABI_VERSION | ||
| MAINTAINERS | ||
| Makefile | ||
| meson_options.txt | ||
| meson.build | ||
| README | ||
| VERSION | ||
DPDK is a set of libraries and drivers for fast packet processing. It supports many processor architectures and both FreeBSD and Linux. The DPDK uses the Open Source BSD-3-Clause license for the core libraries and drivers. The kernel components are GPL-2.0 licensed. Please check the doc directory for release notes, API documentation, and sample application information. For questions and usage discussions, subscribe to: users@dpdk.org Report bugs and issues to the development mailing list: dev@dpdk.org