Re: AIO operation and CMSG
Am Mittwoch, 17. Januar 2018, 20:22:13 CET schrieb Christoph Hellwig: Hi Christoph, > On Sun, Jan 14, 2018 at 09:01:00AM +0100, Stephan Müller wrote: > > The syscall io_submit sends data to the kernel and invokes the respective > > handler function in the kernel such as the recvmsg handler. What I am > > wondering is whether there is a way to send CMSG data along with the > > io_submit syscall? If not, is CMSG handling with the AIO syscalls > > possible at all? > Not as-is, but it could be easily added by repurposing unused fields > in the iocb. The big question is if it should be done to the existing > IOCB_CMD_PREADV/IOCB_CMD_PWRITEV types, or if new SENDMSG/RECVMSG ones > should be added instead. Thank you for the clarification. I think for the moment we have found another solution that we are discussing at linux-crypto. Therefore, I would currently not see the need for an additional support of CMSG in AIO. Ciao Stephan
Re: AIO operation and CMSG
Am Mittwoch, 17. Januar 2018, 20:22:13 CET schrieb Christoph Hellwig: Hi Christoph, > On Sun, Jan 14, 2018 at 09:01:00AM +0100, Stephan Müller wrote: > > The syscall io_submit sends data to the kernel and invokes the respective > > handler function in the kernel such as the recvmsg handler. What I am > > wondering is whether there is a way to send CMSG data along with the > > io_submit syscall? If not, is CMSG handling with the AIO syscalls > > possible at all? > Not as-is, but it could be easily added by repurposing unused fields > in the iocb. The big question is if it should be done to the existing > IOCB_CMD_PREADV/IOCB_CMD_PWRITEV types, or if new SENDMSG/RECVMSG ones > should be added instead. Thank you for the clarification. I think for the moment we have found another solution that we are discussing at linux-crypto. Therefore, I would currently not see the need for an additional support of CMSG in AIO. Ciao Stephan
Re: AIO operation and CMSG
On Sun, Jan 14, 2018 at 09:01:00AM +0100, Stephan Müller wrote: > The syscall io_submit sends data to the kernel and invokes the respective > handler function in the kernel such as the recvmsg handler. What I am > wondering is whether there is a way to send CMSG data along with the > io_submit > syscall? If not, is CMSG handling with the AIO syscalls possible at all? Not as-is, but it could be easily added by repurposing unused fields in the iocb. The big question is if it should be done to the existing IOCB_CMD_PREADV/IOCB_CMD_PWRITEV types, or if new SENDMSG/RECVMSG ones should be added instead. Also you really want to Cc the relevant lists, I've only accidentally seen this on linux-kernel. > > Thank you very much. > > [1] http://www.chronox.de/libkcapi.html > > Ciao > Stephan > > ---end quoted text---
Re: AIO operation and CMSG
On Sun, Jan 14, 2018 at 09:01:00AM +0100, Stephan Müller wrote: > The syscall io_submit sends data to the kernel and invokes the respective > handler function in the kernel such as the recvmsg handler. What I am > wondering is whether there is a way to send CMSG data along with the > io_submit > syscall? If not, is CMSG handling with the AIO syscalls possible at all? Not as-is, but it could be easily added by repurposing unused fields in the iocb. The big question is if it should be done to the existing IOCB_CMD_PREADV/IOCB_CMD_PWRITEV types, or if new SENDMSG/RECVMSG ones should be added instead. Also you really want to Cc the relevant lists, I've only accidentally seen this on linux-kernel. > > Thank you very much. > > [1] http://www.chronox.de/libkcapi.html > > Ciao > Stephan > > ---end quoted text---
