netdev - Re: [iproute2] devlink: add support for DEVLINK_CMD_REGION

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Date:   Tue, 28 Apr 2020 07:43:21 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [iproute2] devlink: add support for DEVLINK_CMD_REGION_NEW

Tue, Apr 28, 2020 at 04:05:12AM CEST, jacob.e.keller@...el.com wrote:
>Add support to request that a new snapshot be taken immediately for
>a devlink region. To avoid confusion, the desired snapshot id must be
>provided.
>
>Note that if a region does not support snapshots on demand, the kernel
>will reject the request with -EOPNOTSUP.
>
>Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
>---
> devlink/devlink.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
>diff --git a/devlink/devlink.c b/devlink/devlink.c
>index 67e6e64181f9..c750ee1ec6d3 100644
>--- a/devlink/devlink.c
>+++ b/devlink/devlink.c
>@@ -6362,10 +6362,27 @@ static int cmd_region_read(struct dl *dl)
> 	return err;
> }
> 
>+static int cmd_region_snapshot_new(struct dl *dl)
>+{
>+	struct nlmsghdr *nlh;
>+	int err;
>+
>+	nlh = mnlg_msg_prepare(dl->nlg, DEVLINK_CMD_REGION_NEW,
>+			NLM_F_REQUEST | NLM_F_ACK);
>+
>+	err = dl_argv_parse_put(nlh, dl, DL_OPT_HANDLE_REGION |
>+				DL_OPT_REGION_SNAPSHOT_ID, 0);
>+	if (err)
>+		return err;
>+
>+	return _mnlg_socket_sndrcv(dl->nlg, nlh, NULL, NULL);
>+}
>+
> static void cmd_region_help(void)
> {
> 	pr_err("Usage: devlink region show [ DEV/REGION ]\n");
> 	pr_err("       devlink region del DEV/REGION snapshot SNAPSHOT_ID\n");
>+	pr_err("       devlink region new DEV/REGION [snapshot SNAPSHOT_ID]\n");

Same as for "del", snapshot id is mandatory. You should not have it in "[]".


> 	pr_err("       devlink region dump DEV/REGION [ snapshot SNAPSHOT_ID ]\n");
> 	pr_err("       devlink region read DEV/REGION [ snapshot SNAPSHOT_ID ] address ADDRESS length LENGTH\n");
> }
>@@ -6389,6 +6406,9 @@ static int cmd_region(struct dl *dl)
> 	} else if (dl_argv_match(dl, "read")) {
> 		dl_arg_inc(dl);
> 		return cmd_region_read(dl);
>+	} else if (dl_argv_match(dl, "new")) {
>+		dl_arg_inc(dl);
>+		return cmd_region_snapshot_new(dl);
> 	}
> 	pr_err("Command \"%s\" not found\n", dl_argv(dl));
> 	return -ENOENT;
>-- 
>2.25.2
>