netdev - [RFC PATCH 2/3] devlink: add support for DEVLINK_CMD_REGION_TAKE

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Date:   Thu, 30 Jan 2020 14:59:12 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     netdev@...r.kernel.org
Cc:     jiri@...nulli.us, valex@...lanox.com, linyunsheng@...wei.com,
        lihong.yang@...el.com, Jacob Keller <jacob.e.keller@...el.com>
Subject: [RFC PATCH 2/3] devlink: add support for DEVLINK_CMD_REGION_TAKE_SNAPSHOT

Add support to request an immediate snapshot of a devlink region. This
enables the devlink program to obtain a snapshot of the region if the
driver for the region supports immediate snapshots.

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 73ce98654fd8..ac1ad8aa0769 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -4163,6 +4163,7 @@ static const char *cmd_obj(uint8_t cmd)
 	case DEVLINK_CMD_REGION_SET:
 	case DEVLINK_CMD_REGION_NEW:
 	case DEVLINK_CMD_REGION_DEL:
+	case DEVLINK_CMD_REGION_TAKE_SNAPSHOT:
 		return "region";
 	case DEVLINK_CMD_FLASH_UPDATE:
 	case DEVLINK_CMD_FLASH_UPDATE_END:
@@ -6345,12 +6346,28 @@ static int cmd_region_read(struct dl *dl)
 	return err;
 }
 
+static int cmd_region_take_snapshot(struct dl *dl)
+{
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = mnlg_msg_prepare(dl->nlg, DEVLINK_CMD_REGION_TAKE_SNAPSHOT,
+			NLM_F_REQUEST | NLM_F_ACK);
+
+	err = dl_argv_parse_put(nlh, dl, DL_OPT_HANDLE_REGION, 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 dump DEV/REGION [ snapshot SNAPSHOT_ID ]\n");
 	pr_err("       devlink region read DEV/REGION [ snapshot SNAPSHOT_ID ] address ADDRESS length LENGTH\n");
+	pr_err("       devlink region snapshot DEV/REGION\n");
 }
 
 static int cmd_region(struct dl *dl)
@@ -6372,6 +6389,9 @@ 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, "snapshot")) {
+		dl_arg_inc(dl);
+		return cmd_region_take_snapshot(dl);
 	}
 	pr_err("Command \"%s\" not found\n", dl_argv(dl));
 	return -ENOENT;
-- 
2.25.0.rc1