From 23408827f9f74062a43041154a78505bc9fa4ed8 Mon Sep 17 00:00:00 2001
From: Honggang Li <honli@redhat.com>
Date: Tue, 3 Nov 2020 20:21:33 +0800
Subject: [PATCH] Only load i40iw for i40e device with specific PCI IDs

This a redhat specific hack to handle i40iw huge memory consuming issue.

rdma-core upstream maintainer believes this issue should be handled in
kernel space with i40e/i40iw driver. Unfortunately, Intel does not care
about this request.

<snip>
Just for the record, why is it a bad idea to use the original udev
rule that contained "kmod load i40iw". Two reasons:
a) for most i40e NICs i40iw is irrelevant and we have the memory issue
that Intel won't fix.
b) if i40iw is loaded you can no longer unload i40e by itself.
$ modprobe i40iw
$ modprobe -r i40e
modprobe: FATAL: Module i40e is in use.

Bad user experience and we may break existing user scripts!
Even worse unloading i40iw unloads i40e implicitly.
Also i40iw is going away upstream at some point.
<snip>

Resolves: bz1850462

Signed-off-by: Honggang Li <honli@redhat.com>
---
 kernel-boot/rdma-hw-modules.rules | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/kernel-boot/rdma-hw-modules.rules b/kernel-boot/rdma-hw-modules.rules
index 95eaf7206702..541516eb98f4 100644
--- a/kernel-boot/rdma-hw-modules.rules
+++ b/kernel-boot/rdma-hw-modules.rules
@@ -11,11 +11,29 @@ ENV{ID_NET_DRIVER}=="be2net", RUN{builtin}+="kmod load ocrdma"
 ENV{ID_NET_DRIVER}=="bnxt_en", RUN{builtin}+="kmod load bnxt_re"
 ENV{ID_NET_DRIVER}=="cxgb4", RUN{builtin}+="kmod load iw_cxgb4"
 ENV{ID_NET_DRIVER}=="hns", RUN{builtin}+="kmod load hns_roce"
-ENV{ID_NET_DRIVER}=="i40e", RUN{builtin}+="kmod load i40iw"
 ENV{ID_NET_DRIVER}=="mlx4_en", RUN{builtin}+="kmod load mlx4_ib"
 ENV{ID_NET_DRIVER}=="mlx5_core", RUN{builtin}+="kmod load mlx5_ib"
 ENV{ID_NET_DRIVER}=="qede", RUN{builtin}+="kmod load qedr"
 
+# Because most of X722 don't support RDMA, only load i40iw for X722 with specific device IDs.
+#define I40E_INTEL_VENDOR_ID            0x8086
+#define I40E_DEV_ID_X722                0x37CC
+#define I40E_DEV_ID_KX_X722             0x37CE
+#define I40E_DEV_ID_QSFP_X722           0x37CF
+#define I40E_DEV_ID_SFP_X722            0x37D0
+#define I40E_DEV_ID_1G_BASE_T_X722      0x37D1
+#define I40E_DEV_ID_10G_BASE_T_X722     0x37D2
+#define I40E_DEV_ID_SFP_I_X722          0x37D3
+#define I40E_DEV_ID_X722_VF             0x37CD
+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37cc", RUN{builtin}+="kmod load i40iw"
+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37ce", RUN{builtin}+="kmod load i40iw"
+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37cf", RUN{builtin}+="kmod load i40iw"
+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37d0", RUN{builtin}+="kmod load i40iw"
+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37d1", RUN{builtin}+="kmod load i40iw"
+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37d2", RUN{builtin}+="kmod load i40iw"
+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37d3", RUN{builtin}+="kmod load i40iw"
+ENV{ID_NET_DRIVER}=="i40e", ENV{ID_VENDOR_ID}=="0x8086", ENV{ID_MODEL_ID}=="0x37cd", RUN{builtin}+="kmod load i40iw"
+
 # The user must explicitly load these modules via /etc/modules-load.d/ or otherwise
 # rxe
 
-- 
2.25.4