[iproute2 v3] devlink: add support for DEVLINK_CMD_REGION_NEW

[Jacob Keller]

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.kel...@intel.com>
---
 devlink/devlink.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 67e6e64181f9..827ee74a2015 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");
        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