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Date:   Mon, 1 Apr 2019 09:37:55 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Steve Wise <larrystevenwise@...il.com>
Cc:     dsahern@...il.com, stephen@...workplumber.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH v2 iproute2-next 3/4] rdma: add 'link add/delete' commands

On Tue, Mar 26, 2019 at 02:18:29PM -0500, Steve Wise wrote:
> Add new 'link' subcommand 'add' and 'delete' to allow binding a soft-rdma
> device to a netdev interface.
>
> EG:
>
> rdma link add rxe_eth0 type rxe netdev eth0
> rdma link delete rxe_eth0
>
> Signed-off-by: Steve Wise <larrystevenwise@...il.com>
> ---
>  rdma/link.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>  rdma/rdma.h |  2 ++
>  2 files changed, 85 insertions(+)
>
> diff --git a/rdma/link.c b/rdma/link.c
> index 89e81b84..982c2b16 100644
> --- a/rdma/link.c
> +++ b/rdma/link.c
> @@ -9,6 +9,9 @@
>  static int link_help(struct rd *rd)
>  {
>  	pr_out("Usage: %s link show [DEV/PORT_INDEX]\n", rd->filename);
> +	pr_out("Usage: %s link add NAME type TYPE netdev NETDEV\n",
> +	       rd->filename);
> +	pr_out("Usage: %s link delete NAME\n", rd->filename);
>  	return 0;
>  }
>
> @@ -336,10 +339,90 @@ static int link_show(struct rd *rd)
>  	return rd_exec_link(rd, link_one_show, true);
>  }
>
> +static int link_add_netdev(struct rd *rd)
> +{
> +	rd->link_netdev = rd_argv(rd);
> +	rd_arg_inc(rd);
> +	return 0;
> +}
> +
> +static int link_add_type(struct rd *rd)
> +{
> +	const struct rd_cmd cmds[] = {
> +		{ NULL,		link_help},
> +		{ "netdev",	link_add_netdev},
> +		{ 0 }
> +	};
> +	rd->link_type = rd_argv(rd);
> +	rd_arg_inc(rd);
> +	return rd_exec_cmd(rd, cmds, "parameter");
> +}
> +
> +static int link_add(struct rd *rd)
> +{
> +	const struct rd_cmd cmds[] = {
> +		{ NULL,		link_help},
> +		{ "type",	link_add_type},
> +		{ 0 }
> +	};
> +
> +	uint32_t seq;
> +	char *name;
> +	int ret;
> +
> +	if (rd_no_arg(rd)) {
> +		pr_err("Please provide a link name to add.\n");
> +		return -EINVAL;
> +	}
> +	name = rd_argv(rd);
> +	rd_arg_inc(rd);
> +
> +	ret = rd_exec_cmd(rd, cmds, "parameter");
> +	if (ret)
> +		return ret;
> +
> +	if (!rd->link_type) {
> +		pr_err("Please provide a link type name.\n");
> +		return -EINVAL;
> +	}
> +	if (!rd->link_netdev) {
> +		pr_err("Please provide a net device name.\n");
> +		return -EINVAL;
> +	}

After a little bit more thinking, the checks above are supposed to be
part of rd_exec_cmd() execution of chains. E.g if (!rd->link_type) needs
to be inside link_add_type().

> +
> +	rd_prepare_msg(rd, RDMA_NLDEV_CMD_NEWLINK, &seq,
> +		       (NLM_F_REQUEST | NLM_F_ACK));
> +	mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_DEV_NAME, name);
> +	mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_LINK_TYPE, rd->link_type);
> +	mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_NDEV_NAME, rd->link_netdev);
> +	return rd_sendrecv_msg(rd, seq);
> +}
> +
> +static int _link_del(struct rd *rd)
> +{
> +	uint32_t seq;
> +
> +	if (!rd_no_arg(rd)) {
> +		pr_err("Unknown parameter %s\n", rd_argv(rd));
> +		return -EINVAL;
> +	}
> +	rd_prepare_msg(rd, RDMA_NLDEV_CMD_DELLINK, &seq,
> +		       (NLM_F_REQUEST | NLM_F_ACK));
> +	mnl_attr_put_u32(rd->nlh, RDMA_NLDEV_ATTR_DEV_INDEX, rd->dev_idx);
> +	return rd_sendrecv_msg(rd, seq);
> +}
> +
> +static int link_del(struct rd *rd)
> +{
> +	return rd_exec_require_dev(rd, _link_del);
> +}
> +
>  int cmd_link(struct rd *rd)
>  {
>  	const struct rd_cmd cmds[] = {
>  		{ NULL,		link_show },
> +		{ "add",	link_add },
> +		{ "delete",	link_del },
>  		{ "show",	link_show },
>  		{ "list",	link_show },
>  		{ "help",	link_help },
> diff --git a/rdma/rdma.h b/rdma/rdma.h
> index 6c7f7d15..070c8ddf 100644
> --- a/rdma/rdma.h
> +++ b/rdma/rdma.h
> @@ -70,6 +70,8 @@ struct rd {
>  	bool pretty_output;
>  	bool suppress_errors;
>  	struct list_head filter_list;
> +	char *link_type;
> +	char *link_netdev;
>  };
>
>  struct rd_cmd {
> --
> 2.20.1
>

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