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Message-ID: <1518754097.1827.8.camel@mendozajonas.com>
Date: Fri, 16 Feb 2018 15:08:17 +1100
From: Samuel Mendoza-Jonas <sam@...dozajonas.com>
To: Joel Stanley <joel@....id.au>, sdasari@...com
Cc: OpenBMC Maillist <openbmc@...ts.ozlabs.org>, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] net/ncsi: Add generic netlink family
On Thu, 2018-02-15 at 14:50 +1030, Joel Stanley wrote:
> Hey Sam,
>
> On Thu, Feb 15, 2018 at 2:00 PM, Samuel Mendoza-Jonas
> <sam@...dozajonas.com> wrote:
> > Add a generic netlink family for NCSI. This supports two commands;
> > NCSI_CMD_PKG_INFO which returns information on packages and their
> > associated channels, and NCSI_CMD_SET_INTERFACE which allows a specific
> > package or package/channel combination to be set as the preferred
> > choice.
> >
> > Signed-off-by: Samuel Mendoza-Jonas <sam@...dozajonas.com>
> > ---
> > Fielding an RFC first to gauge what sort of information people may want
> > out of an NCSI user API before it gets carved in stone. This RFC exposes
> > a few main things such as link state, active link, channel versions, and
> > active vlan ids, is there more that could be helpful in version 1 of the
> > UAPI?
> > The big drawcard here is of course the ability to set preferred packages
> > and channels so that the NCSI link can be bound to *only* port 0 for
> > example. If you have opinions about how this should function now is the
> > time to speak up :)
>
> I'd recommend ccing the netdev mailing list in addition to OpenBMC.
True, I was mostly thinking of checking in with the OpenBMC group but
I'll add in netdev now as well in case I've made a netlink faux pas :)
>
> I was chatting with Facebook people about some advanced uses of NCSI.
> I've added Sai to cc, hopefully he can loop in the right people.
>
> The advanced uses included per-manufacturer OEM commands for MAC
> address retrieval, firmware updates, and I heard someone mention temp
> sensors-over-NCSI. I'm not that all of those would fall into the
> category of a netlink API or not, but it's worth considering those
> requirements in your design, even if you're not implementing it at
> this stage.
Yep there's been some brainstorming about this as well. I suspect at
least a generic "send an NCSI packet with this header and these
parameters" Netlink command could be a good fit - that way the NCSI
driver is aware of any response frames instead of receiving unexpected
frames and throwing them away / logging an error.
OEM-specific stuff is probably best left out of the driver but with that
interface could be handled nicely.
>
> Would a netlink API mean we would have to write some userspace tools
> to perform this configuration? Do you have any code for that?
Yes and yes - I've got a little python script that matches this patch,
I'll link it once I've cleaned it up a little.
>
> Cheers,
>
> Joel
>
>
> >
> > include/uapi/linux/ncsi.h | 65 ++++++++
> > net/ncsi/Makefile | 2 +-
> > net/ncsi/internal.h | 3 +
> > net/ncsi/ncsi-manage.c | 28 +++-
> > net/ncsi/ncsi-netlink.c | 394 ++++++++++++++++++++++++++++++++++++++++++++++
> > net/ncsi/ncsi-netlink.h | 20 +++
> > 6 files changed, 508 insertions(+), 4 deletions(-)
> > create mode 100644 include/uapi/linux/ncsi.h
> > create mode 100644 net/ncsi/ncsi-netlink.c
> > create mode 100644 net/ncsi/ncsi-netlink.h
> >
> > diff --git a/include/uapi/linux/ncsi.h b/include/uapi/linux/ncsi.h
> > new file mode 100644
> > index 000000000000..45de201569e3
> > --- /dev/null
> > +++ b/include/uapi/linux/ncsi.h
> > @@ -0,0 +1,65 @@
> > +/*
> > + * Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + */
> > +
> > +#ifndef __UAPI_NCSI_NETLINK_H__
> > +#define __UAPI_NCSI_NETLINK_H__
> > +
> > +enum ncsi_nl_commands {
> > + NCSI_CMD_UNSPEC,
> > + NCSI_CMD_SET_INTERFACE,
> > + NCSI_CMD_PKG_INFO,
> > + NCSI_CMD_MAX,
> > +};
> > +
> > +#define NCSI_CMD_MAX (NCSI_CMD_MAX - 1)
> > +
> > +enum ncsi_nl_attrs {
> > + NCSI_ATTR_UNSPEC,
> > + NCSI_ATTR_IFINDEX,
> > + NCSI_ATTR_PACKAGE_LIST,
> > + NCSI_ATTR_PACKAGE_ID,
> > + NCSI_ATTR_CHANNEL_ID,
> > + NCSI_ATTR_MAX,
> > +};
> > +
> > +enum ncsi_nl_pkg_attrs {
> > + NCSI_PKG_ATTR_UNSPEC,
> > + NCSI_PKG_ATTR,
> > + NCSI_PKG_ATTR_ID,
> > + NCSI_PKG_ATTR_CHANNEL_LIST,
> > + NCSI_PKG_ATTR_MAX,
> > +};
> > +
> > +enum ncsi_nl_channel_attrs {
> > + NCSI_CHANNEL_ATTR_UNSPEC,
> > + NCSI_CHANNEL_ATTR,
> > + NCSI_CHANNEL_ATTR_ID,
> > + NCSI_CHANNEL_ATTR_VERSION_MAJOR,
> > + NCSI_CHANNEL_ATTR_VERSION_MINOR,
> > + NCSI_CHANNEL_ATTR_VERSION_STR,
> > + NCSI_CHANNEL_ATTR_LINK_STATE,
> > + NCSI_CHANNEL_ATTR_ACTIVE,
> > + NCSI_CHANNEL_ATTR_VLAN_LIST,
> > + NCSI_CHANNEL_ATTR_MAX,
> > +};
> > +
> > +enum ncsi_nl_vlan_attrs {
> > + NCSI_VLAN_UNSPEC,
> > + NCSI_VLAN_ATTR,
> > + NCSI_VLAN_ATTR_ID,
> > + NCSI_VLAN_ATTR_PROTO,
> > + NCSI_VLAN_ATTR_MAX,
> > +};
> > +
> > +#define NCSI_ATTR_MAX (NCSI_ATTR_MAX - 1)
> > +#define NCSI_PKG_ATTR_MAX (NCSI_PKG_ATTR_MAX - 1)
> > +#define NCSI_CHANNEL_ATTR_MAX (NCSI_CHANNEL_ATTR_MAX - 1)
> > +#define NCSI_VLAN_ATTR_MAX (NCSI_VLAN_ATTR_MAX - 1)
> > +
> > +#endif /* __UAPI_NCSI_NETLINK_H__ */
> > diff --git a/net/ncsi/Makefile b/net/ncsi/Makefile
> > index dd12b564f2e7..436ef68331f2 100644
> > --- a/net/ncsi/Makefile
> > +++ b/net/ncsi/Makefile
> > @@ -1,4 +1,4 @@
> > #
> > # Makefile for NCSI API
> > #
> > -obj-$(CONFIG_NET_NCSI) += ncsi-cmd.o ncsi-rsp.o ncsi-aen.o ncsi-manage.o
> > +obj-$(CONFIG_NET_NCSI) += ncsi-cmd.o ncsi-rsp.o ncsi-aen.o ncsi-manage.o ncsi-netlink.o
> > diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
> > index d30f7bd741d0..8da84312cd3b 100644
> > --- a/net/ncsi/internal.h
> > +++ b/net/ncsi/internal.h
> > @@ -276,6 +276,8 @@ struct ncsi_dev_priv {
> > unsigned int package_num; /* Number of packages */
> > struct list_head packages; /* List of packages */
> > struct ncsi_channel *hot_channel; /* Channel was ever active */
> > + struct ncsi_package *force_package; /* Force a specific package */
> > + struct ncsi_channel *force_channel; /* Force a specific channel */
> > struct ncsi_request requests[256]; /* Request table */
> > unsigned int request_id; /* Last used request ID */
> > #define NCSI_REQ_START_IDX 1
> > @@ -318,6 +320,7 @@ extern spinlock_t ncsi_dev_lock;
> > list_for_each_entry_rcu(nc, &np->channels, node)
> >
> > /* Resources */
> > +u32 *ncsi_get_filter(struct ncsi_channel *nc, int table, int index);
> > int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data);
> > int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data);
> > int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index);
> > diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
> > index b799d7962544..f324f3fec11b 100644
> > --- a/net/ncsi/ncsi-manage.c
> > +++ b/net/ncsi/ncsi-manage.c
> > @@ -12,7 +12,6 @@
> > #include <linux/init.h>
> > #include <linux/netdevice.h>
> > #include <linux/skbuff.h>
> > -#include <linux/netlink.h>
> >
> > #include <net/ncsi.h>
> > #include <net/net_namespace.h>
> > @@ -23,6 +22,7 @@
> >
> > #include "internal.h"
> > #include "ncsi-pkt.h"
> > +#include "ncsi-netlink.h"
> >
> > LIST_HEAD(ncsi_dev_list);
> > DEFINE_SPINLOCK(ncsi_dev_lock);
> > @@ -964,20 +964,37 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
> >
> > static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
> > {
> > - struct ncsi_package *np;
> > - struct ncsi_channel *nc, *found, *hot_nc;
> > + struct ncsi_package *np, *force_package;
> > + struct ncsi_channel *nc, *found, *hot_nc, *force_channel;
> > struct ncsi_channel_mode *ncm;
> > unsigned long flags;
> >
> > spin_lock_irqsave(&ndp->lock, flags);
> > hot_nc = ndp->hot_channel;
> > + force_channel = ndp->force_channel;
> > + force_package = ndp->force_package;
> > spin_unlock_irqrestore(&ndp->lock, flags);
> >
> > + /* Force a specific channel whether or not it has link if we have been
> > + * configured to do so
> > + */
> > + if (force_package && force_channel) {
> > + found = force_channel;
> > + ncm = &found->modes[NCSI_MODE_LINK];
> > + if (!(ncm->data[2] & 0x1))
> > + netdev_info(ndp->ndev.dev,
> > + "NCSI: Channel %u forced, but it is link down\n",
> > + found->id);
> > + goto out;
> > + }
> > +
> > /* The search is done once an inactive channel with up
> > * link is found.
> > */
> > found = NULL;
> > NCSI_FOR_EACH_PACKAGE(ndp, np) {
> > + if (ndp->force_package && np != ndp->force_package)
> > + continue;
> > NCSI_FOR_EACH_CHANNEL(np, nc) {
> > spin_lock_irqsave(&nc->lock, flags);
> >
> > @@ -1594,6 +1611,9 @@ struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
> > ndp->ptype.dev = dev;
> > dev_add_pack(&ndp->ptype);
> >
> > + /* Set up generic netlink interface */
> > + ncsi_init_netlink(dev);
> > +
> > return nd;
> > }
> > EXPORT_SYMBOL_GPL(ncsi_register_dev);
> > @@ -1673,6 +1693,8 @@ void ncsi_unregister_dev(struct ncsi_dev *nd)
> > #endif
> > spin_unlock_irqrestore(&ncsi_dev_lock, flags);
> >
> > + ncsi_unregister_netlink(nd->dev);
> > +
> > kfree(ndp);
> > }
> > EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
> > diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c
> > new file mode 100644
> > index 000000000000..02f4f89805d6
> > --- /dev/null
> > +++ b/net/ncsi/ncsi-netlink.c
> > @@ -0,0 +1,394 @@
> > +/*
> > + * Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/kernel.h>
> > +#include <linux/if_arp.h>
> > +#include <linux/rtnetlink.h>
> > +#include <linux/etherdevice.h>
> > +#include <linux/module.h>
> > +#include <net/genetlink.h>
> > +#include <net/ncsi.h>
> > +#include <linux/skbuff.h>
> > +#include <net/sock.h>
> > +#include <uapi/linux/ncsi.h>
> > +
> > +#include "internal.h"
> > +#include "ncsi-netlink.h"
> > +
> > +static struct genl_family ncsi_genl_family;
> > +
> > +static const struct nla_policy ncsi_genl_policy[NCSI_ATTR_MAX + 1] = {
> > + [NCSI_ATTR_IFINDEX] = { .type = NLA_U32 },
> > + [NCSI_ATTR_PACKAGE_LIST] = { .type = NLA_NESTED },
> > + [NCSI_ATTR_PACKAGE_ID] = { .type = NLA_U32 },
> > + [NCSI_ATTR_CHANNEL_ID] = { .type = NLA_U32 },
> > +};
> > +
> > +static struct ncsi_dev_priv *ndp_from_ifindex(struct net *net, u32 ifindex)
> > +{
> > + struct ncsi_dev_priv *ndp;
> > + struct net_device *dev;
> > + struct ncsi_dev *nd;
> > + struct ncsi_dev;
> > +
> > + if (!net)
> > + return NULL;
> > +
> > + dev = dev_get_by_index(net, ifindex);
> > + if (!dev) {
> > + printk(KERN_ERR "NCSI netlink: No device for ifindex %u\n",
> > + ifindex);
> > + return NULL;
> > + }
> > +
> > + nd = ncsi_find_dev(dev);
> > + ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
> > +
> > + dev_put(dev);
> > + return ndp;
> > +}
> > +
> > +static int ncsi_write_channel_info(struct sk_buff *skb,
> > + struct ncsi_dev_priv *ndp,
> > + struct ncsi_channel *nc)
> > +{
> > + struct nlattr *vlist_nest, *vlan_nest;
> > + struct ncsi_channel_filter *ncf;
> > + struct ncsi_channel_mode *m;
> > + u32 *data;
> > + int i;
> > +
> > + nla_put_u32(skb, NCSI_CHANNEL_ATTR_ID, nc->id);
> > + m = &nc->modes[NCSI_MODE_LINK];
> > + nla_put_u32(skb, NCSI_CHANNEL_ATTR_LINK_STATE, m->data[2]);
> > + if (nc->state == NCSI_CHANNEL_ACTIVE)
> > + nla_put_flag(skb, NCSI_CHANNEL_ATTR_ACTIVE);
> > +
> > + nla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MAJOR, nc->version.version);
> > + nla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MINOR, nc->version.alpha2);
> > + nla_put_string(skb, NCSI_CHANNEL_ATTR_VERSION_STR, nc->version.fw_name);
> > +
> > + vlist_nest = nla_nest_start(skb, NCSI_CHANNEL_ATTR_VLAN_LIST);
> > + if (!vlist_nest)
> > + return -ENOMEM;
> > + ncf = nc->filters[NCSI_FILTER_VLAN];
> > + i = -1;
> > + if (ncf) {
> > + while ((i = find_next_bit((void *)&ncf->bitmap, ncf->total,
> > + i + 1)) < ncf->total) {
> > + data = ncsi_get_filter(nc, NCSI_FILTER_VLAN, i);
> > + /* Uninitialised channels will have 'zero' vlan ids */
> > + if (!data || !*data)
> > + continue;
> > + vlan_nest = nla_nest_start(skb, NCSI_VLAN_ATTR);
> > + if (!vlan_nest)
> > + continue;
> > + nla_put_u16(skb, NCSI_VLAN_ATTR_ID, *(u16 *)data);
> > + nla_nest_end(skb, vlan_nest);
> > + }
> > + }
> > + nla_nest_end(skb, vlist_nest);
> > +
> > + return 0;
> > +}
> > +
> > +static int ncsi_write_package_info(struct sk_buff *skb,
> > + struct ncsi_dev_priv *ndp, unsigned int id)
> > +{
> > + struct nlattr *pnest, *cnest, *nest;
> > + struct ncsi_package *np;
> > + struct ncsi_channel *nc;
> > + bool found;
> > + int rc;
> > +
> > + if (id > ndp->package_num) {
> > + netdev_info(ndp->ndev.dev, "NCSI: No package with id %u\n", id);
> > + return -ENODEV;
> > + }
> > +
> > + found = false;
> > + NCSI_FOR_EACH_PACKAGE(ndp, np) {
> > + if (np->id != id)
> > + continue;
> > + pnest = nla_nest_start(skb, NCSI_PKG_ATTR);
> > + if (!pnest)
> > + return -ENOMEM;
> > + nla_put_u32(skb, NCSI_PKG_ATTR_ID, np->id);
> > + cnest = nla_nest_start(skb, NCSI_PKG_ATTR_CHANNEL_LIST);
> > + if (!cnest) {
> > + nla_nest_cancel(skb, pnest);
> > + return -ENOMEM;
> > + }
> > + NCSI_FOR_EACH_CHANNEL(np, nc) {
> > + nest = nla_nest_start(skb, NCSI_CHANNEL_ATTR);
> > + if (!nest) {
> > + nla_nest_cancel(skb, cnest);
> > + nla_nest_cancel(skb, pnest);
> > + return -ENOMEM;
> > + }
> > + rc = ncsi_write_channel_info(skb, ndp, nc);
> > + if (rc) {
> > + nla_nest_cancel(skb, nest);
> > + nla_nest_cancel(skb, cnest);
> > + nla_nest_cancel(skb, pnest);
> > + return rc;
> > + }
> > + nla_nest_end(skb, nest);
> > + }
> > + nla_nest_end(skb, cnest);
> > + nla_nest_end(skb, pnest);
> > + found = true;
> > + }
> > +
> > + if (!found)
> > + return -ENODEV;
> > +
> > + return 0;
> > +}
> > +
> > +static int ncsi_pkg_info_nl(struct sk_buff *msg, struct genl_info *info)
> > +{
> > + struct ncsi_dev_priv *ndp;
> > + unsigned int package_id;
> > + struct sk_buff *skb;
> > + struct nlattr *attr;
> > + void *hdr;
> > + int rc;
> > +
> > + if (!info || !info->attrs)
> > + return -EINVAL;
> > +
> > + if (!info->attrs[NCSI_ATTR_IFINDEX])
> > + return -EINVAL;
> > +
> > + if (!info->attrs[NCSI_ATTR_PACKAGE_ID])
> > + return -EINVAL;
> > +
> > + ndp = ndp_from_ifindex(genl_info_net(info),
> > + nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
> > + if (!ndp)
> > + return -ENODEV;
> > +
> > + skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
> > + if (!skb)
> > + return -ENOMEM;
> > +
> > + hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq,
> > + &ncsi_genl_family, 0, NCSI_CMD_PKG_INFO);
> > + if (!hdr) {
> > + kfree(skb);
> > + return -EMSGSIZE;
> > + }
> > +
> > + package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
> > +
> > + attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
> > + rc = ncsi_write_package_info(skb, ndp, package_id);
> > +
> > + if (rc) {
> > + nla_nest_cancel(skb, attr);
> > + goto err;
> > + }
> > +
> > + nla_nest_end(skb, attr);
> > +
> > + genlmsg_end(skb, hdr);
> > + return genlmsg_reply(skb, info);
> > +
> > +err:
> > + genlmsg_cancel(skb, hdr);
> > + kfree(skb);
> > + return rc;
> > +}
> > +
> > +static int ncsi_pkg_info_all_nl(struct sk_buff *skb,
> > + struct netlink_callback *cb)
> > +{
> > + struct nlattr *attrs[NCSI_ATTR_MAX];
> > + struct ncsi_package *np, *package;
> > + struct ncsi_dev_priv *ndp;
> > + unsigned int package_id;
> > + struct nlattr *attr;
> > + void *hdr;
> > + int rc;
> > +
> > + rc = genlmsg_parse(cb->nlh, &ncsi_genl_family, attrs, NCSI_ATTR_MAX,
> > + ncsi_genl_policy);
> > + if (rc)
> > + return rc;
> > +
> > + if (!attrs[NCSI_ATTR_IFINDEX])
> > + return -EINVAL;
> > +
> > + ndp = ndp_from_ifindex(get_net(sock_net(skb->sk)),
> > + nla_get_u32(attrs[NCSI_ATTR_IFINDEX]));
> > +
> > + if (!ndp)
> > + return -ENODEV;
> > +
> > + package_id = cb->args[0];
> > + package = NULL;
> > + NCSI_FOR_EACH_PACKAGE(ndp, np)
> > + if (np->id == package_id)
> > + package = np;
> > +
> > + if (!package)
> > + return 0; /* done */
> > +
> > + hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
> > + &ncsi_genl_family, 0, NCSI_CMD_PKG_INFO);
> > + if (!hdr) {
> > + rc = -EMSGSIZE;
> > + goto err;
> > + }
> > +
> > + attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
> > + rc = ncsi_write_package_info(skb, ndp, package->id);
> > + if (rc) {
> > + nla_nest_cancel(skb, attr);
> > + goto err;
> > + }
> > +
> > + nla_nest_end(skb, attr);
> > + genlmsg_end(skb, hdr);
> > +
> > + cb->args[0] = package_id + 1;
> > +
> > + return skb->len;
> > +err:
> > + genlmsg_cancel(skb, hdr);
> > + return rc;
> > +}
> > +
> > +static int ncsi_set_interface_nl(struct sk_buff *msg, struct genl_info *info)
> > +{
> > + struct ncsi_package *np, *package;
> > + struct ncsi_channel *nc, *channel;
> > + u32 package_id, channel_id;
> > + struct ncsi_dev_priv *ndp;
> > + unsigned long flags;
> > +
> > + if (!info || !info->attrs)
> > + return -EINVAL;
> > +
> > + if (!info->attrs[NCSI_ATTR_IFINDEX])
> > + return -EINVAL;
> > +
> > + ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)),
> > + nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
> > + if (!ndp)
> > + return -ENODEV;
> > +
> > + if (!info->attrs[NCSI_ATTR_PACKAGE_ID]) {
> > + /* Clear any override */
> > + spin_lock_irqsave(&ndp->lock, flags);
> > + ndp->force_package = NULL;
> > + ndp->force_channel = NULL;
> > + spin_unlock_irqrestore(&ndp->lock, flags);
> > + netdev_info(ndp->ndev.dev,
> > + "NCSI: Cleared preferred package/channel\n");
> > + goto done;
> > + }
> > +
> > + package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
> > + package = NULL;
> > +
> > + spin_lock_irqsave(&ndp->lock, flags);
> > +
> > + NCSI_FOR_EACH_PACKAGE(ndp, np)
> > + if (np->id == package_id)
> > + package = np;
> > + if (!package) {
> > + /* The user has set a package that does not exist */
> > + return -ERANGE;
> > + }
> > +
> > + channel = NULL;
> > + if (!info->attrs[NCSI_ATTR_CHANNEL_ID]) {
> > + /* Allow any channel */
> > + channel_id = NCSI_RESERVED_CHANNEL;
> > + } else {
> > + channel_id = nla_get_u32(info->attrs[NCSI_ATTR_CHANNEL_ID]);
> > + NCSI_FOR_EACH_CHANNEL(package, nc)
> > + if (nc->id == channel_id)
> > + channel = nc;
> > + }
> > +
> > + if (channel_id != NCSI_RESERVED_CHANNEL && !channel) {
> > + /* The user has set a channel that does not exist on this
> > + * package
> > + */
> > + netdev_info(ndp->ndev.dev, "NCSI: Channel %u does not exist!\n",
> > + channel_id);
> > + return -ERANGE;
> > + }
> > +
> > + ndp->force_package = package;
> > + ndp->force_channel = channel;
> > + spin_unlock_irqrestore(&ndp->lock, flags);
> > +
> > + netdev_info(ndp->ndev.dev, "Set package 0x%x, channel 0x%x%s as preferred\n",
> > + package_id, channel_id,
> > + channel_id == NCSI_RESERVED_CHANNEL ? " (any)" : "");
> > +
> > +done:
> > + /* Bounce the NCSI channel to set changes */
> > + ncsi_stop_dev(&ndp->ndev);
> > + ncsi_start_dev(&ndp->ndev);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct genl_ops ncsi_ops[] = {
> > + {
> > + .cmd = NCSI_CMD_SET_INTERFACE,
> > + .policy = ncsi_genl_policy,
> > + .doit = ncsi_set_interface_nl,
> > + .flags = GENL_ADMIN_PERM,
> > + },
> > + {
> > + .cmd = NCSI_CMD_PKG_INFO,
> > + .policy = ncsi_genl_policy,
> > + .doit = ncsi_pkg_info_nl,
> > + .dumpit = ncsi_pkg_info_all_nl,
> > + .flags = 0,
> > + },
> > +};
> > +
> > +static struct genl_family ncsi_genl_family __ro_after_init = {
> > + .name = "NCSI",
> > + .version = 0,
> > + .maxattr = NCSI_ATTR_MAX,
> > + .module = THIS_MODULE,
> > + .ops = ncsi_ops,
> > + .n_ops = ARRAY_SIZE(ncsi_ops),
> > +};
> > +
> > +int ncsi_init_netlink(struct net_device *dev)
> > +{
> > + int rc;
> > +
> > + rc = genl_register_family(&ncsi_genl_family);
> > + if (rc)
> > + netdev_err(dev, "ncsi: failed to register netlink family\n");
> > +
> > + return rc;
> > +}
> > +
> > +int ncsi_unregister_netlink(struct net_device *dev)
> > +{
> > + int rc;
> > +
> > + rc = genl_unregister_family(&ncsi_genl_family);
> > + if (rc)
> > + netdev_err(dev, "ncsi: failed to unregister netlink family\n");
> > +
> > + return rc;
> > +}
> > diff --git a/net/ncsi/ncsi-netlink.h b/net/ncsi/ncsi-netlink.h
> > new file mode 100644
> > index 000000000000..91a5c256f8c4
> > --- /dev/null
> > +++ b/net/ncsi/ncsi-netlink.h
> > @@ -0,0 +1,20 @@
> > +/*
> > + * Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + */
> > +
> > +#ifndef __NCSI_NETLINK_H__
> > +#define __NCSI_NETLINK_H__
> > +
> > +#include <linux/netdevice.h>
> > +
> > +#include "internal.h"
> > +
> > +int ncsi_init_netlink(struct net_device *dev);
> > +int ncsi_unregister_netlink(struct net_device *dev);
> > +
> > +#endif /* __NCSI_NETLINK_H__ */
> > --
> > 2.16.1
> >
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