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Message-ID: <CAM0EoMmRj9NmztK1fTRrEm05M0hGP_0FpWjeQsKt7CCM2kHZQA@mail.gmail.com>
Date: Sun, 31 Dec 2023 14:01:48 -0500
From: Jamal Hadi Salim <jhs@...atatu.com>
To: Pedro Tammela <pctammela@...atatu.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, xiyou.wangcong@...il.com,
jiri@...nulli.us
Subject: Re: [PATCH net-next] net/sched: sch_api: conditional netlink notifications
On Fri, Dec 29, 2023 at 8:27 AM Pedro Tammela <pctammela@...atatu.com> wrote:
>
> Implement conditional netlink notifications for Qdiscs and classes,
> which were missing in the initial patches that targeted tc filters and
> actions. Notifications will only be built after passing a check for
> 'rtnl_notify_needed()'.
>
> For both Qdiscs and classes 'get' operations now call a dedicated
> notification function as it was not possible to distinguish between
> 'create' and 'get' before. This distinction is necessary because 'get'
> always send a notification.
>
> Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
cheers,
jamal
> ---
> net/sched/sch_api.c | 79 ++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 68 insertions(+), 11 deletions(-)
>
> diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
> index 299086bb6205..2a2a48838eb9 100644
> --- a/net/sched/sch_api.c
> +++ b/net/sched/sch_api.c
> @@ -1003,6 +1003,32 @@ static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
> return false;
> }
>
> +static int qdisc_get_notify(struct net *net, struct sk_buff *oskb,
> + struct nlmsghdr *n, u32 clid, struct Qdisc *q,
> + struct netlink_ext_ack *extack)
> +{
> + struct sk_buff *skb;
> + u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
> +
> + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
> + if (!skb)
> + return -ENOBUFS;
> +
> + if (!tc_qdisc_dump_ignore(q, false)) {
> + if (tc_fill_qdisc(skb, q, clid, portid, n->nlmsg_seq, 0,
> + RTM_NEWQDISC, extack) < 0)
> + goto err_out;
> + }
> +
> + if (skb->len)
> + return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
> + n->nlmsg_flags & NLM_F_ECHO);
> +
> +err_out:
> + kfree_skb(skb);
> + return -EINVAL;
> +}
> +
> static int qdisc_notify(struct net *net, struct sk_buff *oskb,
> struct nlmsghdr *n, u32 clid,
> struct Qdisc *old, struct Qdisc *new,
> @@ -1011,6 +1037,9 @@ static int qdisc_notify(struct net *net, struct sk_buff *oskb,
> struct sk_buff *skb;
> u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
>
> + if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
> + return 0;
> +
> skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
> if (!skb)
> return -ENOBUFS;
> @@ -1583,7 +1612,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
> if (err != 0)
> return err;
> } else {
> - qdisc_notify(net, skb, n, clid, NULL, q, NULL);
> + qdisc_get_notify(net, skb, n, clid, q, NULL);
> }
> return 0;
> }
> @@ -1977,6 +2006,9 @@ static int tclass_notify(struct net *net, struct sk_buff *oskb,
> struct sk_buff *skb;
> u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
>
> + if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
> + return 0;
> +
> skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
> if (!skb)
> return -ENOBUFS;
> @@ -1990,6 +2022,27 @@ static int tclass_notify(struct net *net, struct sk_buff *oskb,
> n->nlmsg_flags & NLM_F_ECHO);
> }
>
> +static int tclass_get_notify(struct net *net, struct sk_buff *oskb,
> + struct nlmsghdr *n, struct Qdisc *q,
> + unsigned long cl, struct netlink_ext_ack *extack)
> +{
> + struct sk_buff *skb;
> + u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
> +
> + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
> + if (!skb)
> + return -ENOBUFS;
> +
> + if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, RTM_NEWTCLASS,
> + extack) < 0) {
> + kfree_skb(skb);
> + return -EINVAL;
> + }
> +
> + return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
> + n->nlmsg_flags & NLM_F_ECHO);
> +}
> +
> static int tclass_del_notify(struct net *net,
> const struct Qdisc_class_ops *cops,
> struct sk_buff *oskb, struct nlmsghdr *n,
> @@ -2003,14 +2056,18 @@ static int tclass_del_notify(struct net *net,
> if (!cops->delete)
> return -EOPNOTSUPP;
>
> - skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
> - if (!skb)
> - return -ENOBUFS;
> + if (rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
> + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
> + if (!skb)
> + return -ENOBUFS;
>
> - if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
> - RTM_DELTCLASS, extack) < 0) {
> - kfree_skb(skb);
> - return -EINVAL;
> + if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
> + RTM_DELTCLASS, extack) < 0) {
> + kfree_skb(skb);
> + return -EINVAL;
> + }
> + } else {
> + skb = NULL;
> }
>
> err = cops->delete(q, cl, extack);
> @@ -2019,8 +2076,8 @@ static int tclass_del_notify(struct net *net,
> return err;
> }
>
> - err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
> - n->nlmsg_flags & NLM_F_ECHO);
> + err = rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
> + n->nlmsg_flags & NLM_F_ECHO);
> return err;
> }
>
> @@ -2215,7 +2272,7 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
> tc_bind_tclass(q, portid, clid, 0);
> goto out;
> case RTM_GETTCLASS:
> - err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS, extack);
> + err = tclass_get_notify(net, skb, n, q, cl, extack);
> goto out;
> default:
> err = -EINVAL;
> --
> 2.40.1
>
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