You have been subscribed to a public bug: ---Problem Description--- Using Ubuntu mainline kernel http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8-rc6/ if we try to enable SRIOV in Mellanox CX4 card it will fail.
# uname -r 4.8.0-040800rc6-generic root@c158f2u09os:~# echo 7 > /sys/class/net/enP5p1s0f0/device/sriov_numvfs -bash: echo: write error: Cannot allocate memory logs show: Sep 16 00:52:46 c158f2u09os kernel: [ 1419.778118] mlx5_core 0005:01:00.0: not enough MMIO resources for SR-IOV Sep 16 00:52:46 c158f2u09os kernel: [ 1419.778238] mlx5_core 0005:01:00.0: enable sriov failed -12 Sep 16 00:52:46 c158f2u09os kernel: [ 1419.778604] mlx5_core 0005:01:00.0: mlx5_core_sriov_enable failed -12 ---uname output--- 4.8.0-040800rc6-generic ---Additional Hardware Info--- To recreate this you need power system and a Mellanox card that can be used for SRIOV. Machine Type = P8 ---Steps to Reproduce--- with a Mellanox card like CX4 with SRIOV enabled. just do this echo to the PF interface in this case was enP5p1s0f0. echo 1 > /sys/class/net/enP5p1s0f0/device If I take kernel 4.8 and I revert the following patch I can get it to work again: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/arch/powerpc/platforms/powernv /pci-ioda.c?id=5958d19a143eb229e9ece20bd4c781ad41cb7d24 From 5958d19a143eb229e9ece20bd4c781ad41cb7d24 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt <b...@kernel.crashing.org> Date: Fri, 8 Jul 2016 15:55:43 +1000 Subject: powerpc/pnv/pci: Fix incorrect PE reservation attempt on some 64-bit BARs ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Taco Screen team (taco-screen-team) Status: New ** Tags: architecture-ppc64le bugnameltc-146447 severity-critical targetmilestone-inin1610 -- Ubuntu 16.10 KVM: kernel 4.8 can not enable SRIOV for power systems https://bugs.launchpad.net/bugs/1624961 You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
