Thanks Can I use NLM_F_MULTI netlink multipart msg flag to send large buffer ? I could not find example of that usage in sending case .
I have a kernel module and tryng to send large buffer to user app. If I can use that flag, will kernel take care of splitting large buffer into small chunks and will kernel also send NLMSG_DONE type msg at end to user app? How should I handle in user app. Can you point me to few example please. On Sat, Apr 22, 2017 at 9:06 PM, Eric Dumazet <eric.duma...@gmail.com> wrote: > On Sat, 2017-04-22 at 19:43 +0530, prashantkumar dhotre wrote: >> I am observing that max netlink msg that my kernel module can send to >> user app is close to 16K. >> >> For larger sizes, genlmsg_unicast() succeeds but my app does not receive >> data. >> >> I have tried increasing RECV buffer size in my user app but that does not >> help. >> >> Regards > > > You need a kernel >= linux-4.9 to get about 32KB > > Why is this limited ? Please read > > https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=d35c99ff77ecb2eb239731b799386f3b3637a31e > > >
