Hi Sri, LKD chapter 15 is right resource for you. specifically you can look for remap_pfn_range function to map I/O memory to user space. Thanks, Rajat On Fri, Feb 11, 2011 at 6:12 PM, YOUNGWHAN SONG <breadncup@xxxxxxxxx> wrote: > Hi Sri, > > > On Feb 10, 2011, at 11:56 AM, Sri Ram Vemulpali wrote: > >> Hi Santosa, >> >> Can you please be more explicit. I do manage buffers internally in >> my module. >> Some cases if it full I will lose data. Can you please provide more >> detailed explanation >> on how to approach this. Thanks. >> >> --Sri >> >> On Wed, Feb 9, 2011 at 10:21 PM, Mulyadi Santosa >> <mulyadi.santosa@xxxxxxxxx> wrote: >>> On Thu, Feb 10, 2011 at 06:45, Sri Ram Vemulpali >>> <sri.ram.gmu06@xxxxxxxxx> wrote: >>>> Hi all, >>>> >>>> How do I map some space between kernel and user space. Can anyone >>>> point me in to right direction. I was trying to map the packets from >>>> my netfilter function to kernel user space, to avoid over head of >>>> copying. Thanks in advance. > > Isn't it possible if your driver supports mmap? Have you checked it out in Linux Kernel Drive chapter 15? > > >>> >>> Not trying to discourage you, but I assume your "filtering" function >>> will be engaged many many times in the case of rapid traffic...thus, >>> the buffer might grow rapidly too, right? In that case, are you sure >>> direct mapping could cope with it? Well unless you're ready to loose >>> some data ..... >>> >>> Anyway, I think you can do that by reserve the buffer in user space >>> and the get_user_page() them. As the bridge, a unique device with >>> ioctl() might do the job. >>> >>> -- >>> regards, >>> >>> Mulyadi Santosa >>> Freelance Linux trainer and consultant >>> >>> blog: the-hydra.blogspot.com >>> training: mulyaditraining.blogspot.com >>> >> >> >> >> -- >> Regards, >> Sri. >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > Daniel. > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
