From 0528074e6bf729fda834271ea4231df44cd83176 Mon Sep 17 00:00:00 2001 From: Albert Date: Thu, 4 Feb 2016 21:45:39 +0200 Subject: [PATCH] How to create Ubuntus chroot and build DKMS modules and binary modules for bootstrap. Change-Id: I17ecaa7bd0e541fb85675f85a0ac0c922ebe4d58 --- devdocs/develop/custom-bootstrap-node.rst | 580 ++++++++++++++++++++++ 1 file changed, 580 insertions(+) diff --git a/devdocs/develop/custom-bootstrap-node.rst b/devdocs/develop/custom-bootstrap-node.rst index 5cee8708f..04bdfeb4d 100644 --- a/devdocs/develop/custom-bootstrap-node.rst +++ b/devdocs/develop/custom-bootstrap-node.rst @@ -270,4 +270,584 @@ follow these steps: cobbler sync +.. _chroot: +Creating Ubuntu chroot on the Fuel Master node +---------------------------------------------- + +.. note:: There is an alternative way of creating a ``chroot`` folder on the + Fuel Master node. You can download prebuilt `VM images`_ for Ubuntu and + run it with your favorite hypervisor. You can also use an IBP Ubuntu image + which is built to your Fuel Master node. + +.. _`VM images`: http://uec-images.ubuntu.com/trusty/current + +This section describes how to create a chroot with Ubuntu on the Fuel Master +node and provides the implementation script. + +Creating a ``chroot`` folder on Ubuntu can be useful for: + +* Rebuilding kernel modules for Ubuntu +* Creating DKMS DEB packages from sources +* Building kernel modules binaries for a given kernel version with DKMS + +The script below creates ``chroot`` on the Fuel Master node using a prebuilt +Ubuntu cloud image **trusty-server-cloudimg-amd64-root.tar.gz** that is +downloaded from the `VM images`_ site. The name of the image and the link +are kept in the ``UBUNTU_IMAGE`` and ``PREBUILT_IMAGE_LINK`` variables +respectively. + +.. note:: Before you copy and run the script, modify the ``UBUNTU_IMAGE``, + ``PREBUILT_IMAGE_LINK``, ``DISTRO_RELEASE``, ``KERNEL_FLAVOR``, or + ``MIRROR_DISTRO`` variables if required. + +The script completes the following steps: + +#. Creates ``chroot`` in the ``/tmp`` folder with the *ubuntu-chroot.XXXXX* + template name (where *XXXXX* is substituted with digits and characters, + for example, ``/tmp/ubuntu-chroot.Yusk8G``). +#. Mounts the ``/proc`` filesystem and creates a ``/dev`` folder with links to + ``/proc`` into the ``chroot`` folder. +#. Prepares a configuration for the ``apt`` package manager. +#. Downloads and installs an additional set of packages, listed in the + ``UBUNTU_PKGS`` variable, to ``chroot``. The packages are required to build + DKMS and deal with the DEB packages. These packages are: ``linux-headers``, + ``dkms``, ``build-essential``, and ``debhelper``. + +.. note:: The Fuel Master node should have access to the Internet to download + a required DEB package from the Ubuntu repository. + + Unmount the ``chroot/proc`` file system and delete ``chroot`` + when you do not need it anymore. + +.. code-block:: bash + + #!/bin/bash + + # Define the kernel flavor and path to the link to a prebuild image. + [ -z "$KERNEL_FLAVOR" ] && KERNEL_FLAVOR="-generic-lts-trusty" + [ -z "$DISTRO_RELEASE" ] && DISTRO_RELEASE="trusty" + [ -z "$UBUNTU_IMAGE" ] && UBUNTU_IMAGE="trusty-server-cloudimg-amd64-root.tar.gz" + [ -z "$PREBUILT_IMAGE_LINK" ] && \ + PREBUILT_IMAGE_LINK="http://uec-images.ubuntu.com/${DISTRO_RELEASE}/current" + + UBUNTU_PKGS="linux-headers${KERNEL_FLAVOR} linux-firmware dkms build-essential debhelper" + + # Create a temporary directory (ubuntu-chroot) using the command: + # [ -z "$root_dir" ] && + root_dir=$(mktemp -d --tmpdir ubuntu-chroot.XXXXX) + chmod 755 ${root_dir} + + # Download a prebuilt image and un-tar it. + # Check if it has been downloaded already. + if [ ! -e "$UBUNTU_IMAGE" ]; then + # download + wget ${PREBUILT_IMAGE_LINK}/${UBUNTU_IMAGE} + fi + tar -xzvf "${UBUNTU_IMAGE}" -C ${root_dir} + + # Install required packages and resolve dependencies. + chroot $root_dir env \ + LC_ALL=C \ + DEBIAN_FRONTEND=noninteractive \ + DEBCONF_NONINTERACTIVE_SEEN=true \ + TMPDIR=/tmp \ + TMP=/tmp \ + PATH=$PATH:/sbin:/bin \ + apt-get update + + chroot $root_dir env \ + LC_ALL=C \ + DEBIAN_FRONTEND=noninteractive \ + DEBCONF_NONINTERACTIVE_SEEN=true \ + TMPDIR=/tmp \ + TMP=/tmp \ + PATH=$PATH:/sbin:/bin \ + apt-get install --force-yes --yes $UBUNTU_PKGS + + echo "Don't forget to delete $root_dir at the end" + + +Adding DKMS kernel modules into bootstrap (Ubuntu) +-------------------------------------------------- + +The key strength of `Dynamic Kernel Module Support (DKMS) `_ +is the ability to rebuild the required kernel module for a different version of +kernels. But there is a drawback of installing DKMS kernel modules into +bootstrap. DKMS builds a module during installation, that queries the +installation of additional packages like ``linux-headers`` and a tool-chain +building. It unnecessarily oversizes the bootstrap. The DKMS package actually +should be installed into an IBP (image-based provisioning) image, which will +be deployed on nodes and be re-built during the kernel updates. + +.. note:: + You can add kernel modules on bootstrap by making the + kernel module binaries in a form of a DEB package and by installing the + package on bootstrap like other packages. + +DKMS provides an ability to build a DEB package and a disk driver archive +on the fly from sources. + +Ubuntu packages can be built on the Fuel Master node in ``chroot`` with Ubuntu +deployed in ``chroot``. For details, see :ref:`chroot`. + +**To create a DKMS package in the ``.deb`` format:** + +#. Copy the required module sources to a folder with the corresponding name + located in ``/usr/src`` of ``chroot``. +#. Create a ``dkms.conf`` configuration file in the ``/usr/src`` directory. +#. Optimize the ``dkms.conf`` file as described in the + :ref:`dkms_example` section. + +.. note:: + If you already have a DKMS package built with sources and want to simply + export the kernel module binaries to DEB format, install the existing + DKMS package into the ``chroot`` folder (and skip the + :ref:`Creating DKMS ` chapter). + +.. _create_dkms: + +Creating a DKMS package from sources +++++++++++++++++++++++++++++++++++++ + +Before creating a ``DKMS`` package from sources, verify that you have +completed the following steps: + +#. Create the :ref:`chroot folder `. +#. Install the following packages to the ``chroot`` folder: ``DKMS``, + ``build-essential``, and ``debhelper``. + +Once you complete the steps above, create a DKMS package from sources: + +#. Create a folder for a required kernel module in the *-* + format in the ``/usr/src`` directory located in ``chroot``. + For example, if the module name is i40e and module version is 1.3.47, + create a ``/usr/src/i40e-1.3.47`` folder in ``chroot``. + +#. Copy the sources into the created folder. + +#. Create and modify a ``dkms.conf`` file in the + ``/usr/src/-/`` directory. + +Example of a minimal dkms.conf file +*********************************** + +Below is an example of a minimal +`dkms.conf `_ file: + +.. code-block:: console + + PACKAGE_NAME="$module_name-dkms" + PACKAGE_VERSION="$module_version" + BUILT_MODULE_NAME="$module_name" + DEST_MODULE_LOCATION="/updates" + +The parameters in the minimal ``dkms.conf`` file are obligatory but not +sufficient to build a module. Therefore, proceed with adding additional +parameters to the ``dkms.conf`` file to make it operational. See the +:ref:`dkms_example` section for details. + +.. _dkms_example: + +Example of an improved dkms.conf file +************************************* + +To make your ``dkms.conf`` file operational, add and configure the following +fields: ``MAKE``, ``CLEAN``, and ``BUILD_MODULE_LOCATION``. There are also internal +variables in DKMS that you can use in ``dkms.conf``, for example, +``$kernelver``. For details, see `DKMS Manual page `_. + +The table below lists the fields that we use in our example to optimize the +``dkms.conf`` file: + + ======================= =================================================== + PACKAGE_NAME The DKMS package name. + PACKAGE_VERSION The DKMS package version. + BUILT_MODULE_NAME The binary kernel module name to be installed. + DEST_MODULE_LOCATION The install location of the binary kernel module. + MAKE The :command:`make` command to build the kernel + module bounded to the kernel version, sources, and + so on. + BUILD_KERNEL The kernel version for which the module should be + build. Use an internal variable ``$kernelver`` here. + CLEAN The ``clean`` directive to clean up after the module + build. + BUILT_MODULE_LOCATION The location of the sources in the DKMS tree. + REMAKE_INITRD Whether the ``initrd`` will be rebuilt or not when + the module is installed. + ======================= =================================================== + +For the i40e module that is used in our example, the following configuration +is applied: + +.. code-block:: console + + PACKAGE_NAME="i40e-dkms" + PACKAGE_VERSION="1.3.47" + BUILT_MODULE_NAME="i40e" + DEST_MODULE_LOCATION="/updates" + MAKE="make -C src/ KERNELDIR=/lib/modules/\${kernelver}/build" + BUILD_KERNEL="\${kernelver}" + CLEAN="make -C src/ clean" + BUILT_MODULE_LOCATION="src/" + REMAKE_INITRD="yes" + +.. note:: + The path that is set in the configuration file is bound to the DKMS tree. + For example, ``DEST_MODULE_LOCATION="/updates"`` actually means + ``/lib/modules/$kernelver/updates``. + + We recommend that you install new modules in the ``/updates`` directory for a + `safe update `_ + of the kernel modules. + +Exporting DKMS package and kernel binaries +****************************************** + +When ``dkms.conf`` is ready, you can build the binaries in ``chroot`` and +export the ``DKMS`` package with kernel module binaries to the ``.deb`` format. + +Use the DKMS commands to add and build a DKMS module for a particular kernel +version. + +When the build is done, run the following commands to create a DEB package +and a disk-driver ``.tar`` archive in ``chroot``: + +.. code-block:: console + + mkdeb + mkdriverdisk + +See details in the bash script below. + +The script builds a DKMS package in ``chroot``. The output is a disk-driver +archive containing the module binaries built against the kernel installed in +the ``chroot`` . + +The second produced package is a DKMS module. The output is placed into the +``/tmp/dkms-deb`` folder: + +.. code-block:: bash + + $ ls /tmp/dkms-deb/ + i40e-1.3.47-ubuntu-dd.tar i40e-dkms_1.3.47_all.deb + +.. code-block:: console + + The script requires following parameters to be provided: + $1 - ``chroot`` folder with Ubuntu has been deployed + $2 - module name + $3 - module version + $4 - path to the folder where is sources of the kernel module + +.. warning:: + The script unmounts the ``/proc`` file system from ``chroot`` and + finally deletes ``chroot`` made by the first script. Run the script with + the root privileges. + +.. code-block:: bash + + #!/bin/bash + # Check passed parameters, expectations are following: + # $1 - chroot folder with Ubuntu has been deployed + # $2 - module name + # $3 - module version + # $4 - path to the folder where is sources of the kernel module + + if [ $# != 4 ] ; + then + echo "ERR: Passed wrong number of parameters, the expectation are following" + echo " $1 - chroot folder with Ubuntu has been deployed" + echo " $2 - module name" + echo " $3 - module version" + echo " $4 - path to the folder where is sources of the module" + echo "$0 " + exit 1; + else + root_dir=$1 # chroot folder + module_name=$2 + module_version=$3 + module_src_dir=$4 + fi + if [ ! -d "$root_dir" ] || [ ! -d "$module_src_dir" ] ; + then + echo "ERR: The $root_dir or $module_src_dir was not found"; + exit 1; + fi + + output_dir="/tmp/dkms-deb" + + # Create the folder ${root_dir}/usr/src/${module-name}-${module-version} + mkdir -p "${root_dir}/usr/src/${module_name}-${module_version}" + chmod 755 "${root_dir}/usr/src/${module_name}-${module_version}" + + # Copy sources into the folder + cp -R "$module_src_dir"/* \ + ${root_dir}/usr/src/${module_name}-${module_version} + + # Create the dkms.conf package + cat > "${root_dir}/usr/src/${module_name}-${module_version}/dkms.conf" <<-EOF + MAKE="make -C src/ KERNELDIR=/lib/modules/\${kernelver}/build" + BUILD_KERNEL="\${kernelver}" + CLEAN="make -C src/ clean" + BUILT_MODULE_NAME="$module_name" + BUILT_MODULE_LOCATION="src/" + DEST_MODULE_LOCATION="/updates" + PACKAGE_NAME="$module_name-dkms" + PACKAGE_VERSION="$module_version" + REMAKE_INITRD="yes" + EOF + + # Deduce the kernel version + KERNELDIR=$(ls -d ${root_dir}/lib/modules/*) + kv="${KERNELDIR##*/}" + + # Build the binaries by DKMS + # Add the dkms + chroot $root_dir env \ + LC_ALL=C \ + DEBIAN_FRONTEND=noninteractive \ + DEBCONF_NONINTERACTIVE_SEEN=true \ + TMPDIR=/tmp \ + TMP=/tmp \ + PATH=$PATH:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \ + BUILD_KERNEL=${kv} \ + dkms add -m "${module_name}"/"${module_version}" -k ${kv} + + # Build the kernel module by dkms + chroot $root_dir env \ + LC_ALL=C \ + DEBIAN_FRONTEND=noninteractive \ + DEBCONF_NONINTERACTIVE_SEEN=true \ + TMPDIR=/tmp \ + TMP=/tmp \ + PATH=$PATH:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \ + BUILD_KERNEL=${kv} \ + dkms build -m "${module_name}"/"${module_version}" -k ${kv} + + # Create the deb-dkms package + chroot $root_dir env \ + LC_ALL=C \ + DEBIAN_FRONTEND=noninteractive \ + DEBCONF_NONINTERACTIVE_SEEN=true \ + TMPDIR=/tmp \ + TMP=/tmp \ + PATH=$PATH:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \ + BUILD_KERNEL=${kernelver} \ + dkms mkdeb -m "${module_name}"/"${module_version}" -k ${kv} + + # Create the disk-driver archive with + # module binaries in deb package ready to install on bootstrap + chroot $root_dir env \ + LC_ALL=C \ + DEBIAN_FRONTEND=noninteractive \ + DEBCONF_NONINTERACTIVE_SEEN=true \ + TMPDIR=/tmp \ + TMP=/tmp \ + BUILD_KERNEL=${kv} \ + PATH=$PATH:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \ + dkms mkdriverdisk -m "${module_name}"/"${module_version}" \ + -k ${kv} -d ubuntu --media tar + + # Create /tmp/dkms-deb folder and copy the created deb file into it + if [ ! -d "${output_dir}" ]; + then + mkdir -p ${output_dir} + fi + # Copy the built deb dkms package into the folder + # and driver disk tar archive.i + # The archive contains the binary module as a deb package for given kernel version + # + cp ${root_dir}/var/lib/dkms/${module_name}/${module_version}/deb/*.deb ${output_dir} + cp ${root_dir}/var/lib/dkms/${module_name}/${module_version}/driver_disk/*.tar ${output_dir} + + # Don't forget to umount ${root_dir}/proc and remove ${root_dir} + umount ${root_dir}/proc + rm -Rf ${root_dir} + +Extracting kernel module binaries +********************************* + +The ``/tmp/dkms-deb`` folder contains a built DKMS DEB package. You can +install it into IBP. The ``DEB`` package with the kernel module binaries +built for a given kernel version is archived in the disk-driver archive. + +Unpack the ``.tar`` file and copy the ``.deb`` file into the repository. +For example, if the archive is ``i40e-1.3.47-ubuntu-dd.tar`` and the i40e +module was built for kernel 3.13.0-77-generic, the output should be the +following: + +.. code-block:: console + + tar -xvf i40e-1.3.47-ubuntu-dd.tar + ./ + ./ubuntu-drivers/ + ./ubuntu-drivers/3.13.0/ + ./ubuntu-drivers/3.13.0/i40e_1.3.47-3.13.0-77-generic_x86_64.deb + ... + +The ``i40e_1.3.47-3.13.0-77-generic_x86_64.deb`` package contains the kernel +module binaries for kernel 3.13.0-77-generic that you install on the +bootstrap with the kernel. + +.. warning:: + Updating the new kernel for Ubuntu requires rebuilding the DKMS package + against a new kernel in order to get the module binaries package. + +Known Issues +************ + +Not all the kernel module sources can be compiled by DKMS. + +DKMS builds the given drivers sources against different kernels versions. +The ABI (kernel functions) may be changed among different kernels, and +the compilation of a module can potentially fail when calling +non-existing of expired functions. + +The example below shows an attempt to build a module taken from one kernel +version against the other kernel version: + +.. code-block:: console + + # dkms build -m be2net/10.4u + + Kernel preparation unnecessary for this kernel. Skipping... + + Building module: + make clean + make: *** No rule to make target `clean'. Stop. + (bad exit status: 2) + { make KERNELRELEASE=3.13.0-77-generic -C /lib/modules/3.13.0-77-generic/build SUBDIRS=/var/lib/dkms/be2net/10.4u/build modules; } >> /var/lib/dkms/be2net/10.4u/build/make.log 2>&1 + (bad exit status: 2) + ERROR (dkms apport): binary package for be2net: 10.4u not found + Error! Bad return status for module build on kernel: 3.13.0-77-generic (x86_64) + Consult /var/lib/dkms/be2net/10.4u/build/make.log for more information. + +The ``make.log`` file contains errors that some functions or structures +have not been declared or declared implicitly: + +.. code-block:: console + + # cat /var/lib/dkms/be2net/10.4u/build/make.log + DKMS make.log for be2net-10.4u for kernel 3.13.0-77-generic (x86_64) + + make: Entering directory `/usr/src/linux-headers-3.13.0-77-generic' + CC [M] /var/lib/dkms/be2net/10.4u/build/be_main.o + /var/lib/dkms/be2net/10.4u/build/be_main.c: In function ‘be_mac_addr_set’: + /var/lib/dkms/be2net/10.4u/build/be_main.c:315:2: error: implicit declaration of function ‘ether_addr_copy’ [-Werror=implicit-function-declaration] + ether_addr_copy(netdev->dev_addr, addr->sa_data); + ^ + /var/lib/dkms/be2net/10.4u/build/be_main.c: In function ‘be_get_tx_vlan_tag’: + /var/lib/dkms/be2net/10.4u/build/be_main.c:727:2: error: implicit declaration of function ‘skb_vlan_tag_get’ [-Werror=implicit-function-declaration] + vlan_tag = skb_vlan_tag_get(skb); + ^ + /var/lib/dkms/be2net/10.4u/build/be_main.c: In function ‘be_get_wrb_params_from_skb’: + /var/lib/dkms/be2net/10.4u/build/be_main.c:789:2: error: implicit declaration of function ‘skb_vlan_tag_present’ [-Werror=implicit-function-declaration] + if (skb_vlan_tag_present(skb)) { + ^ + /var/lib/dkms/be2net/10.4u/build/be_main.c: In function ‘be_insert_vlan_in_pkt’: + /var/lib/dkms/be2net/10.4u/build/be_main.c:1001:3: error: implicit declaration of function ‘vlan_insert_tag_set_proto’ [-Werror=implicit-function-declaration] + skb = vlan_insert_tag_set_proto(skb, htons(ETH_P_8021Q), + ^ + /var/lib/dkms/be2net/10.4u/build/be_main.c:1001:7: warning: assignment makes pointer from integer without a cast [enabled by default] + skb = vlan_insert_tag_set_proto(skb, htons(ETH_P_8021Q), + ^ + /var/lib/dkms/be2net/10.4u/build/be_main.c:1011:7: warning: assignment makes pointer from integer without a cast [enabled by default] + skb = vlan_insert_tag_set_proto(skb, htons(ETH_P_8021Q), + ^ + /var/lib/dkms/be2net/10.4u/build/be_main.c: In function ‘be_xmit_workarounds’: + /var/lib/dkms/be2net/10.4u/build/be_main.c:1132:3: error: implicit declaration of function ‘skb_put_padto’ [-Werror=implicit-function-declaration] + if (skb_put_padto(skb, 36)) + ^ + /var/lib/dkms/be2net/10.4u/build/be_main.c: In function ‘be_xmit’: + /var/lib/dkms/be2net/10.4u/build/be_main.c:1299:19: error: ‘struct sk_buff’ has no member named ‘xmit_more’ + bool flush = !skb->xmit_more; + +To make the kernel module sources compatible with different kernels, the +sources should contain the wrappers, which are re-declaring changed functions +depending on the kernel version. This work should be done by driver developers. + +The example below shows the ``compat.h`` file wrapper: + +.. code-block:: console + + /* + * This file is part of the Linux NIC driver for Emulex networking products. + * + * Copyright (C) 2005-2015 Emulex. All rights reserved. + * + * EMULEX and SLI are trademarks of Emulex. + * www.emulex.com + * linux-drivers@emulex.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful. + * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, + * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A + * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO THE + * EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID. + * See the GNU General Public License for more details, a copy of which + * can be found in the file COPYING included with this package + */ + + #ifndef BE_COMPAT_H + #define BE_COMPAT_H + + #ifdef RHEL_RELEASE_CODE + #define RHEL + #endif + + #ifndef RHEL_RELEASE_CODE + #define RHEL_RELEASE_CODE 0 + #endif + + #ifndef RHEL_RELEASE_VERSION + #define RHEL_RELEASE_VERSION(a,b) (((a) << 8) + (b)) + #endif + + #ifndef NETIF_F_HW_VLAN_CTAG_DEFINED + #define NETIF_F_HW_VLAN_CTAG_TX NETIF_F_HW_VLAN_TX + #define NETIF_F_HW_VLAN_CTAG_RX NETIF_F_HW_VLAN_RX + #define NETIF_F_HW_VLAN_CTAG_FILTER NETIF_F_HW_VLAN_FILTER + #endif + + /*************************** NAPI backport ********************************/ + #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 27) + + /* RHEL 5.4+ has a half baked napi_struct implementation. + * Bypass it and use simulated NAPI using multiple netdev structs + */ + #ifdef RHEL + typedef struct napi_struct rhel_napi; + #endif + + #define netif_napi_add netif_napi_add_compat + #define netif_napi_del netif_napi_del_compat + #define napi_gro_frags(napi) napi_gro_frags((rhel_napi*) napi) + #define napi_get_frags(napi) napi_get_frags((rhel_napi*) napi) + #define vlan_gro_frags(napi, g, v) vlan_gro_frags((rhel_napi*) napi, g, v); + #define napi_schedule(napi) netif_rx_schedule((napi)->dev) + #define napi_enable(napi) netif_poll_enable((napi)->dev) + #define napi_disable(napi) netif_poll_disable((napi)->dev) + #define napi_complete(napi) napi_gro_flush((rhel_napi *)napi); \ + netif_rx_complete(napi->dev) + #define napi_schedule_prep(napi) netif_rx_schedule_prep((napi)->dev) + #define __napi_schedule(napi) __netif_rx_schedule((napi)->dev) + + #define napi_struct napi_struct_compat + + struct napi_struct_compat { + #ifdef RHEL + rhel_napi napi; /* must be the first member */ + #endif + struct net_device *dev; + int (*poll) (struct napi_struct *napi, int budget); + }; + + extern void netif_napi_del_compat(struct napi_struct *napi); + extern void netif_napi_add_compat(struct net_device *, struct napi_struct *, + int (*poll) (struct napi_struct *, int), int); + #endif /*********************** NAPI backport *****************************/