Comments (9)
Ok, I found the culprit, which is the line
env.NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
First, a short explanation about the build system which is called ECC (ENA Compatibility Checker):
The system tries to identify the existence of a specific code by trying to compile a small snippet. The assumption here is that the snippet compiles iff the feature is supported by the kernel (we run regular checks to verify that this is indeed the case).
Back to the problem in this ticket:
When ECC checks for the support of ethtool_puts
function it tries to run the following code snippet:
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#define ENA_REQUIRE_MIN_VERSION(A, B, C) LINUX_VERSION_CODE < KERNEL_VERSION(A, B, C)
MODULE_LICENSE("Dual BSD/GPL");
#include <linux/ethtool.h>
int
main(void)
{ethtool_puts(NULL, NULL);
;
return 0;
}
Which for NixOS case returned the compilation output
/build/amzn-drivers/kernel/linux/ena/tmp_ENA_HAVE_ETHTOOL_PUTS_1716303999638_/main.c: In function 'main':
/build/amzn-drivers/kernel/linux/ena/tmp_ENA_HAVE_ETHTOOL_PUTS_1716303999638_/main.c:9:2: warning: implicit declaration of function 'ethtool_puts'; did you mean 'ethtool_sprintf'? [-Wimplicit-function-declaration]
9 | {ethtool_puts(NULL, NULL);
| ^~~~~~~~~~~~
| ethtool_sprintf
This output should have returned an error (as ECC runs the compiler with -Werror=implicit
), however the configuration file prevents failing this test because of this warning.
Removing the line
env.NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
makes the compilation succeed
./configure.sh --kernel-dir /nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/build --verbose
Trying to intercept CC arguments
Detected compiler: /nix/store/md6hh4rrcrf99nssvcam3qaqs3skj086-gcc-wrapper-13.2.0/bin/cc
Managed to intercept CC arguments
Command: /nix/store/md6hh4rrcrf99nssvcam3qaqs3skj086-gcc-wrapper-13.2.0/bin/cc -nostdinc -I/nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/source/arch/x86/include -I./arch/x86/include/generated -I/nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/source/include -I./include -I/nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/source/arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I/nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/source/include/uapi -I./include/generated/uapi -include /nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/source/include/linux/compiler-version.h -include /nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/source/include/linux/kconfig.h -include /nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/source/include/linux/compiler_types.h -D__KERNEL__ -fmacro-prefix-map=/nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/source/= -std=gnu11 -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -fcf-protection=branch -fno-jump-tables -m64 -falign-jumps=1 -falign-loops=1 -mno-80387 -mno-fp-ret-in-387 -mpreferred-stack-boundary=3 -mskip-rax-setup -mtune=generic -mno-red-zone -mcmodel=kernel -fno-asynchronous-unwind-tables -mindirect-branch=thunk-extern -mindirect-branch-register -mindirect-branch-cs-prefix -mfunction-return=thunk-extern -fno-jump-tables -mharden-sls=all -fpatchable-function-entry=16,16 -fno-delete-null-pointer-checks -O2 -fno-allow-store-data-races -fstack-protector-strong -ftrivial-auto-var-init=zero -fno-stack-clash-protection -pg -mrecord-mcount -mfentry -DCC_USING_FENTRY -falign-functions=16 -fstrict-flex-arrays=3 -fno-strict-overflow -fno-stack-check -fconserve-stack -g -DMODULE -DKBUILD_BASENAME="main" -DKBUILD_MODNAME="main" -D__KBUILD_MODNAME=kmod_main -fno-pie -Werror=incompatible-pointer-types -Wno-nonnull -Werror=implicit -isystem /nix/store/9hgsinpfgyvsd92v0wlvmxv9wnaal68r-gcc-13.2.0/lib/gcc/x86_64-unknown-linux-gnu/13.2.0/include
### Detection of the available kernel API ###
ENA_HAVE_PCI_DEV_ID: YES
ENA_HAVE_XDP_DO_FLUSH: YES
ENA_HAVE_CPUMASK_LOCAL_SPREAD: YES
ENA_HAVE_UPDATE_AFFINITY_HINT: YES
ENA_HAVE_ETHTOOL_PUTS: NO
ENA_HAVE_ETHTOOL_RXFH_PARAM: NO
### Detection completed ###
make -C /nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/build M=/build/source/kernel/linux/ena modules
make[1]: Entering directory '/nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/build'
CC [M] /build/source/kernel/linux/ena/ena_netdev.o
CC [M] /build/source/kernel/linux/ena/ena_ethtool.o
CC [M] /build/source/kernel/linux/ena/ena_lpc.o
CC [M] /build/source/kernel/linux/ena/ena_phc.o
CC [M] /build/source/kernel/linux/ena/ena_xdp.o
CC [M] /build/source/kernel/linux/ena/dim.o
CC [M] /build/source/kernel/linux/ena/net_dim.o
CC [M] /build/source/kernel/linux/ena/../common/ena_com//ena_com.o
CC [M] /build/source/kernel/linux/ena/../common/ena_com//ena_eth_com.o
CC [M] /build/source/kernel/linux/ena/ena_sysfs.o
LD [M] /build/source/kernel/linux/ena/ena.o
MODPOST /build/source/kernel/linux/ena/Module.symvers
CC [M] /build/source/kernel/linux/ena/ena.mod.o
LD [M] /build/source/kernel/linux/ena/ena.ko
BTF [M] /build/source/kernel/linux/ena/ena.ko
Skipping BTF generation for /build/source/kernel/linux/ena/ena.ko due to unavailability of vmlinux
make[1]: Leaving directory '/nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/build'
Running phase: installPhase
Running phase: fixupPhase
shrinking RPATHs of ELF executables and libraries in /nix/store/vpnggaamm20k9gg6h4zabrspp69v8psf-ena-2.12.0-6.6.31
checking for references to /build/ in /nix/store/vpnggaamm20k9gg6h4zabrspp69v8psf-ena-2.12.0-6.6.31...
patching script interpreter paths in /nix/store/vpnggaamm20k9gg6h4zabrspp69v8psf-ena-2.12.0-6.6.31
stripping (with command strip and flags -S -p) in /nix/store/vpnggaamm20k9gg6h4zabrspp69v8psf-ena-2.12.0-6.6.31/lib
/nix/store/vpnggaamm20k9gg6h4zabrspp69v8psf-ena-2.12.0-6.6.31
Going further from here:
I don't know the reason for disabling this warning in the package, but please note that this breaks our ECC system. We don't recommended tweaking the compiler error handling when compiling ENA driver
from amzn-drivers.
Glad it worked. The compilation error in kernel 4.19.314 isn't nixOS specific.
The eth_hw_addr_set
function was backported to kernel 4.19.291 but support for it wasn't added to ENA.
We will solve this compilation issue in a future release
For now I attach a temporary patch
0001-Temp-fix-Allow-4.19.291-to-compile-eth_hw_addr_set..txt
(can be manually applied with git am 0001-Temp-fix-Allow-4.19.291-to-compile-eth_hw_addr_set.txt
).
This patch can be applied for all kernel versions (i.e. it doesn't break another compilation)
from amzn-drivers.
Thank you for raising this @kiike
We will look into this.
If you have relevant information such as AMI ID and additional steps that might help us, please share them here.
from amzn-drivers.
Hi,
I'm trying to reproduce the issue. Note that I'm not using NixOS.
I did the following:
Downloaded vanilla kernel version 6.6.30 and compiled it:
$ wget https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.6.30.tar.xz
$ cd linux-6.6.30
$ cp /boot/config-`uname -r` ./.config
$ make olddefconfig
$ ./scripts/config -e CONFIG_NET_VENDOR_AMAZON
$ ./scripts/config -m CONFIG_ENA_ETHERNET
$ make -j`nproc`
Downloading the Github driver and compiled it against this kernel:
$ git clone https://github.com/amzn/amzn-drivers.git ~/amzn-drivers
$ cd ~/amzn-drivers/kernel/linux/ena
$ KERNEL_BUILD_DIR=~/linux-6.6.30 make
The compilation does seem to succeed:
$ KERNEL_BUILD_DIR=~/linux-6.6.30 make
./configure.sh --kernel-dir /home/ec2-user/linux-6.6.30 --verbose
Trying to intercept CC arguments
Detected compiler: gcc
Managed to intercept CC arguments
Command: gcc -nostdinc -I./arch/x86/include -I./arch/x86/include/generated -I./include -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/compiler-version.h -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ -fmacro-prefix-map=./= -std=gnu11 -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -fcf-protection=none -m64 -falign-jumps=1 -falign-loops=1 -mno-80387 -mno-fp-ret-in-387 -mpreferred-stack-boundary=3 -mskip-rax-setup -mtune=generic -mno-red-zone -mcmodel=kernel -fno-asynchronous-unwind-tables -mindirect-branch=thunk-extern -mindirect-branch-register -mindirect-branch-cs-prefix -mfunction-return=thunk-extern -fno-jump-tables -fpatchable-function-entry=16,16 -fno-delete-null-pointer-checks -O2 -fno-allow-store-data-races -fstack-protector-strong -fno-stack-clash-protection -pg -mrecord-mcount -mfentry -DCC_USING_FENTRY -fno-inline-functions-called-once -falign-functions=16 -fno-strict-overflow -fno-stack-check -fconserve-stack -g -gdwarf-4 -DMODULE -DKBUILD_BASENAME="main" -DKBUILD_MODNAME="main" -D__KBUILD_MODNAME=kmod_main -fno-pie -Werror=incompatible-pointer-types -Wno-nonnull -Werror=implicit
### Detection of the available kernel API ###
ENA_HAVE_PCI_DEV_ID: YES
ENA_HAVE_XDP_DO_FLUSH: YES
ENA_HAVE_CPUMASK_LOCAL_SPREAD: YES
ENA_HAVE_UPDATE_AFFINITY_HINT: YES
ENA_HAVE_ETHTOOL_PUTS: NO
ENA_HAVE_ETHTOOL_RXFH_PARAM: NO
### Detection completed ###
make -C /home/ec2-user/linux-6.6.30 M=/home/ec2-user/amzn-drivers/kernel/linux/ena modules
make[1]: Entering directory '/home/ec2-user/linux-6.6.30'
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena_netdev.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena_ethtool.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena_lpc.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena_phc.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena_xdp.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/dim.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/net_dim.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/../common/ena_com//ena_com.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/../common/ena_com//ena_eth_com.o
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena_sysfs.o
LD [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena.o
MODPOST /home/ec2-user/amzn-drivers/kernel/linux/ena/Module.symvers
CC [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena.mod.o
LD [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena.ko
BTF [M] /home/ec2-user/amzn-drivers/kernel/linux/ena/ena.ko
make[1]: Leaving directory '/home/ec2-user/linux-6.6.30'
It is possible that we're using a different version of Linux 6.6.30 or a compiler variance is what causing the check of ethtool_puts
to falsely succeed, so I'd appreciate if you can provide more information for them
from amzn-drivers.
Thanks for trying to reproduce it. The build log contains the intercepted compiler command calls as well as the versions of everything used to try the build. I noticed that there might be something erroneous when calling the build, because the feature detection always reports the same available features, no matter what kernel version I am pointing it to. For instance, for a 4.19 kernel, which should have less available features, I am getting:
ena> ### Detection of the available kernel API ###
ena> ENA_HAVE_PCI_DEV_ID: YES
ena> ENA_HAVE_XDP_DO_FLUSH: YES
ena> ENA_HAVE_CPUMASK_LOCAL_SPREAD: YES
ena> ENA_HAVE_UPDATE_AFFINITY_HINT: YES
ena> ENA_HAVE_ETHTOOL_PUTS: YES
ena> ENA_HAVE_ETHTOOL_RXFH_PARAM: NO
ena> ### Detection completed ###
If I am running the same long command on the git repo, the reported features are more in line what would be expected, although the build fails.
### Detection of the available kernel API ###
ENA_HAVE_PCI_DEV_ID: NO
ENA_HAVE_XDP_DO_FLUSH: NO
ENA_HAVE_CPUMASK_LOCAL_SPREAD: YES
ENA_HAVE_UPDATE_AFFINITY_HINT: NO
ENA_HAVE_ETHTOOL_PUTS: NO
ENA_HAVE_ETHTOOL_RXFH_PARAM: NO
### Detection completed ###
make -C /nix/store/sfd9v1slhdwcz64hn4rl8802y2b7i7fh-linux-4.19.313-dev/lib/modules/4.19.313/build M=/home/kiike/projects/amzn-drivers/kernel/linux/ena modules
CC [M] /home/kiike/projects/amzn-drivers/kernel/linux/ena/ena_netdev.o
In file included from /home/kiike/projects/amzn-drivers/kernel/linux/ena/ena_netdev.h:9,
from /home/kiike/projects/amzn-drivers/kernel/linux/ena/ena_netdev.c:25:
/home/kiike/projects/amzn-drivers/kernel/linux/ena/kcompat.h:900:20: error: redefinition of ‘eth_hw_addr_set’
900 | static inline void eth_hw_addr_set(struct net_device *dev, const u8 *addr)
As a workaround, I am using patches on the kcompat.h file to use the kernel version as a hint.
from amzn-drivers.
The build log contains the intercepted compiler command calls as well as the versions of everything used to try the build
Yup it is, just picking up a NixOS distribution randomly doesn't seem to give the the same environment as yours. It'd be quicker if you send me the ami-id (+region) and the nix configuration you're using.
If I am running the same long command on the git repo, the reported features are more in line what would be expected, although the build fails.
Can you please send me the commands you're using ? Did you try running the commands I used ?
because the feature detection always reports the same available features, no matter what kernel version I am pointing it to.
I'm not sure whether you're using the build instructions for the nix package I found:
https://github.com/NixOS/nixpkgs/blob/nixos-23.11/pkgs/os-specific/linux/ena/default.nix#L26
but if so, note that replacing the kernel directory in the Makefile itself is not the intended way to modify the kernel version.
To build the driver against a specific kernel directory, you need to set the environment variable KERNEL_BUILD_DIR
like I did in my previous comment:
$ export KERNEL_BUILD_DIR=${HOME}/linux-6.6.30
$ make
Maybe using this approach would solve the compilation error
from amzn-drivers.
AMI: ami-07158550d1e5327f0
AMI name: nixos/23.11.7071.71bae31b7dbc-x86_64-linux
Region: eu-west-3
I am using a build derivation similar to what you linked. It's on nixpkgs master. To test building, I am now removing the api features detection patch I included there, as well as an exported env variable with the build dir as per your recommendation.
Here are the contents of the derivation at pkgs/os-specific/linux/ena/default.nix
{ lib, stdenv, fetchFromGitHub, kernel }:
stdenv.mkDerivation rec {
version = "2.12.0";
name = "ena-${version}-${kernel.version}";
src = fetchFromGitHub {
owner = "amzn";
repo = "amzn-drivers";
rev = "ena_linux_${version}";
hash = "sha256-Z/eeIUY7Yl2l/IqK3Z2nxPhn+JLvP976IZ9ZXPBqoSo=";
};
hardeningDisable = [ "pic" ];
nativeBuildInputs = kernel.moduleBuildDependencies;
makeFlags = kernel.makeFlags;
# linux 3.12
env.NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
patches = [
# Use kernel version checks instead of API feature detection
# See https://github.com/NixOS/nixpkgs/pull/310680
# ./override-features-api-detection.patch
];
configurePhase = ''
runHook preConfigure
cd kernel/linux/ena
export ENA_PHC_INCLUDE=1 KERNEL_BUILD_DIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build
runHook postConfigure
'';
installPhase = ''
runHook preInstall
$STRIP -S ena.ko
dest=$out/lib/modules/${kernel.modDirVersion}/misc
mkdir -p $dest
cp ena.ko $dest/
xz $dest/ena.ko
runHook postInstall
'';
meta = with lib; {
description = "Amazon Elastic Network Adapter (ENA) driver for Linux";
homepage = "https://github.com/amzn/amzn-drivers";
license = licenses.gpl2Only;
maintainers = with maintainers; [ eelco sielicki ];
platforms = platforms.linux;
};
}
To trigger the build, I am using the command nix-build -A linuxPackages.ena -v --keep-failed
inside the cloned nixpkgs
repository on the master
branch. This builds for the current default kernel which is 6.6.31, but it's possible to also build the module for 6.8 with nix-build -A linuxPackages_6_8.ena
, or nix-build -A linuxPackages_4_19.ena
for kernel 4.19. Unfortunately, exporting the KERNEL_BUILD_DIR
environment variable doesn't result in the build succeeding.
Thank you for your support on this. Please feel free to close the issue if you think it deviates from the supported path.
UPDATE: To further troubleshoot this, changing directories to the build that failed with nix-build -A linuxPackages.ena -v --keep-failed
and using KERNEL_BUILD_DIR=/nix/store/akphn3a1a37jcnz317pph0kynzm1c7v3-linux-6.6.31-dev/lib/modules/6.6.31/build make
results in a successful build. I'll check if there are differing make flags behind the different build outcomes.
from amzn-drivers.
Thank you so much for researching this further! Your explanation makes sense and I now understand better the reasoning for the error. Indeed, disabling this line enables successful detection of the features and building for the following packaged kernels for NixOS:
- 6.9.1
- 6.8.9
- 6.6.31
- 5.15.159
- 5.4.276
Only 4.19.314 is failing:
ena> ### Detection of the available kernel API ###
ena> ENA_HAVE_PCI_DEV_ID: NO
ena> ENA_HAVE_XDP_DO_FLUSH: NO
ena> ENA_HAVE_CPUMASK_LOCAL_SPREAD: YES
ena> ENA_HAVE_UPDATE_AFFINITY_HINT: NO
ena> ENA_HAVE_ETHTOOL_PUTS: NO
ena> ENA_HAVE_ETHTOOL_RXFH_PARAM: NO
ena> ### Detection completed ###
ena> make -C /nix/store/rdhpl75hqbdpqw52d3gs210i6zs2wwlq-linux-4.19.314-dev/lib/modules/4.19.314/build M=/build/source/kernel/linux/ena modules
ena> CC [M] /build/source/kernel/linux/ena/ena_netdev.o
ena> In file included from /build/source/kernel/linux/ena/ena_netdev.h:9,
ena> from /build/source/kernel/linux/ena/ena_netdev.c:25:
ena> /build/source/kernel/linux/ena/kcompat.h:900:20: error: redefinition of 'eth_hw_addr_set'
ena> 900 | static inline void eth_hw_addr_set(struct net_device *dev, const u8 *addr)
ena> | ^~~~~~~~~~~~~~~
ena> compilation terminated due to -Wfatal-errors.
ena> make[4]: *** [/nix/store/rdhpl75hqbdpqw52d3gs210i6zs2wwlq-linux-4.19.314-dev/lib/modules/4.19.314/source/scripts/Makefile.build:304: /build/source/kernel/linux/ena/ena_netdev.o] Error 1
ena> make[3]: *** [/nix/store/rdhpl75hqbdpqw52d3gs210i6zs2wwlq-linux-4.19.314-dev/lib/modules/4.19.314/source/Makefile:1562: _module_/build/source/kernel/linux/ena] Error 2
ena> make[2]: *** [Makefile:153: sub-make] Error 2
ena> make[1]: *** [Makefile:24: __sub-make] Error 2
ena> make: *** [Makefile:102: ena.ko] Error 2
error: builder for '/nix/store/7ilajxfn7pl9dy9zk4w6ig0vbhr0fwv9-ena-2.12.0-4.19.314.drv' failed with exit code 2
Regarding the flag that disables the warning, I think it can safely go, as 3.12 is not available anymore for NixOS. Here is the build expression:
{
lib,
stdenv,
fetchFromGitHub,
kernel,
}:
stdenv.mkDerivation rec {
version = "2.12.0";
name = "ena-${version}-${kernel.version}";
src = fetchFromGitHub {
owner = "amzn";
repo = "amzn-drivers";
rev = "ena_linux_${version}";
hash = "sha256-Z/eeIUY7Yl2l/IqK3Z2nxPhn+JLvP976IZ9ZXPBqoSo=";
};
hardeningDisable = [ "pic" ];
nativeBuildInputs = kernel.moduleBuildDependencies;
makeFlags = kernel.makeFlags;
env.KERNEL_BUILD_DIR = "${kernel.dev}/lib/modules/${kernel.modDirVersion}/build";
configurePhase = ''
runHook preConfigure
cd kernel/linux/ena
export ENA_PHC_INCLUDE=1
runHook postConfigure
'';
installPhase = ''
runHook preInstall
$STRIP -S ena.ko
dest=$out/lib/modules/${kernel.modDirVersion}/misc
mkdir -p $dest
cp ena.ko $dest/
xz $dest/ena.ko
runHook postInstall
'';
meta = with lib; {
description = "Amazon Elastic Network Adapter (ENA) driver for Linux";
homepage = "https://github.com/amzn/amzn-drivers";
license = licenses.gpl2Only;
maintainers = with maintainers; [
eelco
sielicki
];
platforms = platforms.linux;
};
}
from amzn-drivers.
The patch works perfectly and all other kernel versions compile successfully as you indicated. I am trying to push for using it in NixOS/nixpkgs#313941. Thanks again!
from amzn-drivers.
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