On Tue, 6 Feb 2024 at 21:28, Jerin Jacob <jerinjac...@gmail.com> wrote: > > On Tue, Feb 6, 2024 at 9:20 PM Prashant Upadhyaya > <praupadhy...@gmail.com> wrote: > > > > On Tue, 6 Feb 2024 at 19:43, Bruce Richardson > > <bruce.richard...@intel.com> wrote: > > > > > > On Tue, Feb 06, 2024 at 07:36:16PM +0530, Prashant Upadhyaya wrote: > > > > Hi, > > > > > > > > I have a usecase where I have to evaluate writing a DPDK PMD for a non > > > > PCI/e device doing the ethernet packet i/o. > > > > > > > > Wanted to know if the above usecase is supported by DPDK infra and any > > > > pointers on how one should go about writing a PMD for such a usecase > > > > if supported. Would appreciate any inputs. > > > > > > > Hi, > > > > > > yes, such a usecase is supported, but the specifics of how to go about it > > > will vary depending on the type of PMD it is. DPDK already supports a > > > range > > > of other types of PMD, for emulated, or SW backed PMDs, e.g. net/pcap > > > driver, and drivers for various SoCs which don't use PCI. For the case > > > where the PMD is backed by real hardware (or an emulated device that > > > appears to a VM as a piece of hardware), you may want to consider writing > > > a > > > "bus" driver for DPDK to support probing of the device. For non-HW > > > devices, the "vdev" bus may be what you want to use, where probing is not > > > done and devices are created in response to cmdline arguments on init, or > > > via C APIs later in the app. > > > > > > Regards, > > > /Bruce > > > > Thanks Bruce, this is helpful. Is there any PMD in DPDK code that you > > can refer me to for any SoC which does not use PCI (the usecase of > > backing by real hardware), that would be great to follow. > > > See drivers/bus/* > > Based on your description, vfio-platorm will be the closest > match(driver/bus/platform) > > > > > > Regards > > -Prashant
Thanks Jerin, this is helpful. One more question -- would you or anyone else on the list have information about any off the shelf/custom board with ARM cores (preferably 64 bit) which does ethernet i/o with a non PCI device on that board and for which a DPDK PMD is already available ? I wanted to compare the perf difference on such a board with and without PMD and hopefully read the PMD code for that device as a reference if available. Regards -Prashant
