> > > > The new 'xdp_prog=<string>' vdev arg allows the user to specify the path > to > > a custom XDP program to be set on the device, instead of the default libbpf > > one. The program must have an XSK_MAP of name 'xsks_map' which will > > allow for the redirection of some packets to userspace and thus the PMD, > > using some criteria defined in the program. > > Note: a netdev may only load one program. > > > > Signed-off-by: Ciara Loftus <ciara.lof...@intel.com> > > --- > > [MT] Stupid question :), AF_XDP is specifically related to loading an XDP > program that allows you to redirect packets to an XSK... > why would you want to allow a custom XDP program to be loaded? > > Other than that the code itself looked GTM
Hi Maryam, Thanks for your feedback. It's a good question, and I will update the commit message in the v2 with the reasoning. Sometimes it might be desired to redirect some not all packets to the xsk/PMD. eg. if the user wishes to drop or process a certain type of packet in the kernel. That logic can be put in the custom program. The key is that the custom program allows for *some* packets to still hit the xsk, and we check for that through checking the presence of the xsks_map. Thanks, Ciara > > <snip>
