netdev - Re: [patch net-next v8 08/14] net: sched: add rt netlink message type for block get

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Date:   Mon, 15 Jan 2018 09:56:31 -0700
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, jhs@...atatu.com, xiyou.wangcong@...il.com,
        mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com,
        simon.horman@...ronome.com, pieter.jansenvanvuuren@...ronome.com,
        john.hurley@...ronome.com, alexander.h.duyck@...el.com,
        ogerlitz@...lanox.com, john.fastabend@...il.com,
        daniel@...earbox.net
Subject: Re: [patch net-next v8 08/14] net: sched: add rt netlink message type
 for block get

On 1/12/18 8:46 AM, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...lanox.com>
> 
> Add simple block get operation which primary purpose is to check the
> block existence by block index.
> 
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
> v6->v7:
> - new patch
> ---
>  include/uapi/linux/rtnetlink.h |  6 ++++
>  net/sched/cls_api.c            | 64 ++++++++++++++++++++++++++++++++++++++++++
>  security/selinux/nlmsgtab.c    |  5 +++-
>  3 files changed, 74 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
> index da878f2..4b1f626 100644
> --- a/include/uapi/linux/rtnetlink.h
> +++ b/include/uapi/linux/rtnetlink.h
> @@ -150,6 +150,12 @@ enum {
>  	RTM_NEWCACHEREPORT = 96,
>  #define RTM_NEWCACHEREPORT RTM_NEWCACHEREPORT
>  
> +	RTM_NEWBLOCK = 100,
> +#define RTM_NEWBLOCK RTM_NEWBLOCK
> +	RTM_DELBLOCK,
> +#define RTM_DELBLOCK RTM_DELBLOCK
> +	RTM_GETBLOCK,
> +#define RTM_GETBLOCK RTM_GETBLOCK
>  	__RTM_MAX,
>  #define RTM_MAX		(((__RTM_MAX + 3) & ~3) - 1)
>  };
> diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
> index d687e58..14e4f20 100644
> --- a/net/sched/cls_api.c
> +++ b/net/sched/cls_api.c
> @@ -1553,6 +1553,69 @@ int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
>  }
>  EXPORT_SYMBOL(tc_setup_cb_call);
>  
> +static int block_notify_fill(struct net *net, struct sk_buff *skb,
> +			     struct tcf_block *block, u32 portid, u32 seq,
> +			     u16 flags, int event)
> +{
> +	struct nlmsghdr *nlh;
> +	struct tcmsg *tcm;
> +
> +	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
> +	if (!nlh)
> +		return -EMSGSIZE;
> +	tcm = nlmsg_data(nlh);
> +	memset(tcm, 0, sizeof(*tcm));
> +	tcm->tcm_family = AF_UNSPEC;
> +	tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
> +	tcm->tcm_block_index = block->index;
> +	return 0;
> +}

Why can't this be done with RTM_GETQDISC?