Hi, I have a board based on Intel C3000 (Denverton) processor which has an embedded X553 controller, attached to uPC MDIO there's a PHY that I have to access from user space. Using in-tree ixgbe driver I can access it although ioctl call takes ~40ms to complete (as below) which is too slow.
In-tree-driver ioctl performance: $ sudo strace -T --trace=ioctl ./phytool read eno1/0/2 ioctl(3, SIOCGMIIREG, 0x7fffc81f42c0) = 0 <0.039746> 0x0141 Using a test program which call PHY read 1000 times the program takes 40s to complete although it uses 22ms of user + system time. $ time sudo ./mdio_ioctl_performance 1000 IOCTL Mode reads real 0m40.050s user 0m0.011s sys 0m0.011s Changing to out-of-tree driver (5.19.6) external MDIO access does not work at all even though ethernet ports work. I've noticed that using out-of-tree driver the mdio bus disappears from "/sys/class/mdio_bus/ixgbe-mdio-0000:05:00.0" I've tried Kernel 5.4, 5.15 and 6.5 and the result is the same both using in-tree and out-of-tree driver. Any Idea on how to enable external MDIO access in out-of-tree driver or improve performance using in-tree driver? _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel Ethernet, visit https://community.intel.com/t5/Ethernet-Products/bd-p/ethernet-products
