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Date: Wed, 1 Apr 2020 17:39:09 +0200
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
CC: <davem@...emloft.net>, <jiri@...nulli.us>, <ivecera@...hat.com>,
<kuba@...nel.org>, <roopa@...ulusnetworks.com>,
<olteanv@...il.com>, <andrew@...n.ch>,
<UNGLinuxDriver@...rochip.com>, <linux-kernel@...r.kernel.org>,
<netdev@...r.kernel.org>, <bridge@...ts.linux-foundation.org>
Subject: Re: [RFC net-next v4 4/9] bridge: mrp: Implement netlink interface
to configure MRP
The 03/30/2020 18:30, Nikolay Aleksandrov wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> On 27/03/2020 11:21, Horatiu Vultur wrote:
> > Implement netlink interface to configure MRP. The implementation
> > will do sanity checks over the attributes and then eventually call the MRP
> > interface.
> >
> > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> > ---
> > net/bridge/br_mrp_netlink.c | 176 ++++++++++++++++++++++++++++++++++++
> > 1 file changed, 176 insertions(+)
> > create mode 100644 net/bridge/br_mrp_netlink.c
> >
>
> Hi Horatiu,
Hi Nik,
Thanks for the feedback, I will update all this in the new patch series.
>
> > diff --git a/net/bridge/br_mrp_netlink.c b/net/bridge/br_mrp_netlink.c
> > new file mode 100644
> > index 000000000000..043b7f6cddbe
> > --- /dev/null
> > +++ b/net/bridge/br_mrp_netlink.c
> > @@ -0,0 +1,176 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +
> > +#include <net/genetlink.h>
> > +
> > +#include <uapi/linux/mrp_bridge.h>
> > +#include "br_private.h"
> > +#include "br_private_mrp.h"
> > +
> > +static int br_mrp_parse_instance(struct net_bridge *br, struct nlattr *attr,
> > + int cmd)
> > +{
> > + struct br_mrp_instance *instance;
> > +
> > + if (nla_len(attr) != sizeof(*instance))
> > + return -EINVAL;
> > +
> > + instance = nla_data(attr);
> > +
> > + if (cmd == RTM_SETLINK)
> > + return br_mrp_add(br, instance);
> > + else
> > + return br_mrp_del(br, instance);
> > +}
> > +
> > +static int br_mrp_parse_port_state(struct net_bridge *br,
> > + struct net_bridge_port *p,
> > + struct nlattr *attr)
> > +{
> > + enum br_mrp_port_state_type state;
> > +
> > + if (nla_len(attr) != sizeof(u32) || !p)
> > + return -EINVAL;
> > +
> > + state = nla_get_u32(attr);
> > +
> > + return br_mrp_set_port_state(p, state);
> > +}
> > +
> > +static int br_mrp_parse_port_role(struct net_bridge *br,
> > + struct net_bridge_port *p,
> > + struct nlattr *attr)
> > +{
> > + struct br_mrp_port_role *role;
> > +
> > + if (nla_len(attr) != sizeof(*role) || !p)
> > + return -EINVAL;
> > +
> > + role = nla_data(attr);
> > +
> > + return br_mrp_set_port_role(p, role->ring_id, role->role);
> > +}
> > +
> > +static int br_mrp_parse_ring_state(struct net_bridge *br, struct nlattr *attr)
> > +{
> > + struct br_mrp_ring_state *state;
> > +
> > + if (nla_len(attr) != sizeof(*state))
> > + return -EINVAL;
> > +
> > + state = nla_data(attr);
> > +
> > + return br_mrp_set_ring_state(br, state->ring_id, state->ring_state);
> > +}
> > +
> > +static int br_mrp_parse_ring_role(struct net_bridge *br, struct nlattr *attr)
> > +{
> > + struct br_mrp_ring_role *role;
> > +
> > + if (nla_len(attr) != sizeof(*role))
> > + return -EINVAL;
> > +
> > + role = nla_data(attr);
> > +
> > + return br_mrp_set_ring_role(br, role->ring_id, role->ring_role);
> > +}
> > +
> > +static int br_mrp_parse_start_test(struct net_bridge *br, struct nlattr *attr)
> > +{
> > + struct br_mrp_start_test *test;
> > +
> > + if (nla_len(attr) != sizeof(*test))
> > + return -EINVAL;
> > +
> > + test = nla_data(attr);
> > +
> > + return br_mrp_start_test(br, test->ring_id, test->interval,
> > + test->max_miss, test->period);
> > +}
> > +
> > +int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
> > + struct nlattr *attr, int cmd)
> > +{
> > + struct nlattr *mrp;
> > + int rem, err;
> > +
> > + nla_for_each_nested(mrp, attr, rem) {
> > + err = 0;
> > + switch (nla_type(mrp)) {
> > + case IFLA_BRIDGE_MRP_INSTANCE:
> > + err = br_mrp_parse_instance(br, mrp, cmd);
> > + if (err)
> > + return err;
> > + break;
> > + case IFLA_BRIDGE_MRP_PORT_STATE:
> > + err = br_mrp_parse_port_state(br, p, mrp);
> > + if (err)
> > + return err;
> > + break;
> > + case IFLA_BRIDGE_MRP_PORT_ROLE:
> > + err = br_mrp_parse_port_role(br, p, mrp);
> > + if (err)
> > + return err;
> > + break;
> > + case IFLA_BRIDGE_MRP_RING_STATE:
> > + err = br_mrp_parse_ring_state(br, mrp);
> > + if (err)
> > + return err;
> > + break;
> > + case IFLA_BRIDGE_MRP_RING_ROLE:
> > + err = br_mrp_parse_ring_role(br, mrp);
> > + if (err)
> > + return err;
> > + break;
> > + case IFLA_BRIDGE_MRP_START_TEST:
> > + err = br_mrp_parse_start_test(br, mrp);
> > + if (err)
> > + return err;
> > + break;
> > + }
> > + }
> > +
> > + return 0;
> > +}
>
> All of the above can be implemented via nla_parse_nested() with a proper policy.
> You don't have to manually check for the attribute size. Then your code follows
> the netlink normal (e.g. check the bridge netlink handling) of:
> nla_parse_nested(tb)
> if (tb[attr])
> do_something_with(tb[attr])
> ...
>
>
> > +
> > +void br_mrp_port_open(struct net_device *dev, u8 loc)
> > +{
> > + struct nlattr *af, *mrp;
> > + struct ifinfomsg *hdr;
> > + struct nlmsghdr *nlh;
> > + struct sk_buff *skb;
> > + int err = -ENOBUFS;
> > + struct net *net;
> > +
> > + net = dev_net(dev);
> > +
> > + skb = nlmsg_new(1024, GFP_ATOMIC);
>
> Please add a function which calculates the size based on the attribute sizes.
>
> > + if (!skb)
> > + goto errout;
> > +
> > + nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*hdr), 0);
> > + if (!nlh)
> > + goto errout;
> > +
> > + hdr = nlmsg_data(nlh);
> > + hdr->ifi_family = AF_BRIDGE;
> > + hdr->__ifi_pad = 0;
> > + hdr->ifi_type = dev->type;
> > + hdr->ifi_index = dev->ifindex;
> > + hdr->ifi_flags = dev_get_flags(dev);
> > + hdr->ifi_change = 0;
> > +
> > + af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
> > + mrp = nla_nest_start_noflag(skb, IFLA_BRIDGE_MRP);
> > +
>
> These can return an error which has to be handled.
>
> > + nla_put_u32(skb, IFLA_BRIDGE_MRP_RING_OPEN, loc);
> > +
>
> Same for this.
>
> > + nla_nest_end(skb, mrp);
> > + nla_nest_end(skb, af);
> > + nlmsg_end(skb, nlh);
> > +
> > + rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
> > + return;
> > +errout:
> > + rtnl_set_sk_err(net, RTNLGRP_LINK, err);
> > +}
> > +EXPORT_SYMBOL(br_mrp_port_open);
> >
>
--
/Horatiu
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