> > On 8/11/2020 10:50 AM, Ciara Loftus wrote: > > This RFC integrates shared UMEM support into the AF_XDP PMD. It is > based on the > > WIP kernel series [1] by Magnus Karlsson. > > > > Detailed information on the shared UMEM feature can be found in the final > patch > > in the aforementioned series. > > > > Support for the kernel feature can eventually be detected in DPDK by > querying > > the LINUX_KERNEL_VERSION. As of now the feature is not yet merged > upstream, so > > for this RFC it is assumed the user is using a patched version of v5.8. > > Hi Ciara, > > I don't see this feature in kernel in 5.9.0-rc2, is there any update in the > kernel side?
Hi Ferruh, Some performance quirks have been identified with the latest version of the kernel patch. Once those are resolved we should expect a new revision, hopefully within the 5.9 window. Thanks, Ciara > > > > > Shared UMEM is only available for zero copy mode. > > > > In order to share UMEM information between PMDs, the ethdevs wishing > to share > > must be tracked somehow. The method chosen to do so is similar to > methods used > > in the vHost [2] and vDPA drivers, where pointers to the ethdevs are > maintained > > in an internal list. Proposals for alternate solutions are welcome. > > > > Performance data to follow with the v1. > > > > [1] https://patchwork.ozlabs.org/project/netdev/cover/1595307848- > 20719-1-git-send-email-magnus.karls...@intel.com/ > > [2] > https://git.dpdk.org/dpdk/commit/?id=ee584e9710b9abd60ee9faef664e106 > dcea10085 > > > > Ciara Loftus (1): > > net/af_xdp: shared UMEM support > > > > doc/guides/nics/af_xdp.rst | 5 +- > > drivers/net/af_xdp/rte_eth_af_xdp.c | 315 ++++++++++++++++++++++-- > ---- > > 2 files changed, 252 insertions(+), 68 deletions(-) > >
