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devlink: add support for DEVLINK_CMD_REGION_NEW 

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@intel.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Jacob Keller 2020-04-28 13:43:24 -07:00 committed by Stephen Hemminger
parent 2b93f66863
commit 7ae84fedcb
1 changed files with 20 additions and 0 deletions
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20
devlink/devlink.c
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@ -6464,10 +6464,27 @@ 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");
}
@ -6491,6 +6508,9 @@ 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;