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From 23408827f9f74062a43041154a78505bc9fa4ed8 Mon Sep 17 00:00:00 2001
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From: Honggang Li <honli@redhat.com>
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Date: Tue, 3 Nov 2020 20:21:33 +0800
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Subject: [PATCH] Only load i40iw for i40e device with specific PCI IDs
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This a redhat specific hack to handle i40iw huge memory consuming issue.
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rdma-core upstream maintainer believes this issue should be handled in
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kernel space with i40e/i40iw driver. Unfortunately, Intel does not care
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about this request.
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<snip>
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Just for the record, why is it a bad idea to use the original udev
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rule that contained "kmod load i40iw". Two reasons:
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a) for most i40e NICs i40iw is irrelevant and we have the memory issue
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that Intel won't fix.
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b) if i40iw is loaded you can no longer unload i40e by itself.
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$ modprobe i40iw
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$ modprobe -r i40e
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modprobe: FATAL: Module i40e is in use.
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Bad user experience and we may break existing user scripts!
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Even worse unloading i40iw unloads i40e implicitly.
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Also i40iw is going away upstream at some point.
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<snip>
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Resolves: bz1850462
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Signed-off-by: Honggang Li <honli@redhat.com>
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---
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kernel-boot/rdma-hw-modules.rules | 20 +++++++++++++++++++-
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1 file changed, 19 insertions(+), 1 deletion(-)
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diff --git a/kernel-boot/rdma-hw-modules.rules b/kernel-boot/rdma-hw-modules.rules
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index 95eaf7206702..541516eb98f4 100644
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--- a/kernel-boot/rdma-hw-modules.rules
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+++ b/kernel-boot/rdma-hw-modules.rules
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@@ -11,11 +11,29 @@ ENV{ID_NET_DRIVER}=="be2net", RUN{builtin}+="kmod load ocrdma"
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ENV{ID_NET_DRIVER}=="bnxt_en", RUN{builtin}+="kmod load bnxt_re"
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ENV{ID_NET_DRIVER}=="cxgb4", RUN{builtin}+="kmod load iw_cxgb4"
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ENV{ID_NET_DRIVER}=="hns", RUN{builtin}+="kmod load hns_roce"
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-ENV{ID_NET_DRIVER}=="i40e", RUN{builtin}+="kmod load i40iw"
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ENV{ID_NET_DRIVER}=="mlx4_en", RUN{builtin}+="kmod load mlx4_ib"
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ENV{ID_NET_DRIVER}=="mlx5_core", RUN{builtin}+="kmod load mlx5_ib"
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ENV{ID_NET_DRIVER}=="qede", RUN{builtin}+="kmod load qedr"
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+# Because most of X722 don't support RDMA, only load i40iw for X722 with specific device IDs.
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+#define I40E_INTEL_VENDOR_ID 0x8086
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+#define I40E_DEV_ID_X722 0x37CC
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+#define I40E_DEV_ID_KX_X722 0x37CE
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+#define I40E_DEV_ID_QSFP_X722 0x37CF
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+#define I40E_DEV_ID_SFP_X722 0x37D0
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+#define I40E_DEV_ID_1G_BASE_T_X722 0x37D1
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+#define I40E_DEV_ID_10G_BASE_T_X722 0x37D2
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+#define I40E_DEV_ID_SFP_I_X722 0x37D3
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+#define I40E_DEV_ID_X722_VF 0x37CD
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+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37cc", RUN{builtin}+="kmod load i40iw"
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+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37ce", RUN{builtin}+="kmod load i40iw"
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+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37cf", RUN{builtin}+="kmod load i40iw"
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+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37d0", RUN{builtin}+="kmod load i40iw"
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+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37d1", RUN{builtin}+="kmod load i40iw"
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+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37d2", RUN{builtin}+="kmod load i40iw"
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+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37d3", RUN{builtin}+="kmod load i40iw"
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+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37cd", RUN{builtin}+="kmod load i40iw"
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+
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# The user must explicitly load these modules via /etc/modules-load.d/ or otherwise
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# rxe
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--
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2.25.4
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