[PATCH ethtool-next v2 4/6] add support for stats in subcommands

[Jakub Kicinski <kuba@kernel.org>]

Add new parameters (-I | --include-statistics) which will
control requesting statistic dumps from the kernel.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 ethtool.8.in | 7 +++++++
 ethtool.c    | 8 ++++++++
 internal.h   | 1 +
 3 files changed, 16 insertions(+)

diff --git a/ethtool.8.in b/ethtool.8.in
index f70edb5d9d39..866b4e940dc0 100644
--- a/ethtool.8.in
+++ b/ethtool.8.in
@@ -140,6 +140,9 @@ ethtool \- query or control network driver and hardware settings
 .B ethtool [--json]
 .I args
 .HP
+.B ethtool [-I | --include-statistics]
+.I args
+.HP
 .B ethtool \-\-monitor
 [
 .I command
@@ -499,6 +502,10 @@ Output results in JavaScript Object Notation (JSON). Only a subset of
 options support this. Those which do not will continue to output
 plain text in the presence of this option.
 .TP
+.B \-I \-\-include\-statistics
+Include command-related statistics in the output. This option allows
+displaying relevant device statistics for selected get commands.
+.TP
 .B \-a \-\-show\-pause
 Queries the specified Ethernet device for pause parameter information.
 .TP
diff --git a/ethtool.c b/ethtool.c
index 403616bb7fa0..1d9067e774af 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -6031,6 +6031,7 @@ static int show_usage(struct cmd_context *ctx __maybe_unused)
 	fprintf(stdout, "FLAGS:\n");
 	fprintf(stdout, "	--debug MASK	turn on debugging messages\n");
 	fprintf(stdout, "	--json		enable JSON output format (not supported by all commands)\n");
+	fprintf(stdout, "	-I|--include-statistics		request device statistics related to the command (not supported by all commands)\n");
 
 	return 0;
 }
@@ -6291,6 +6292,13 @@ int main(int argc, char **argp)
 			argc -= 1;
 			continue;
 		}
+		if (*argp && (!strcmp(*argp, "--include-statistics") ||
+			      !strcmp(*argp, "-I"))) {
+			ctx.show_stats = true;
+			argp += 1;
+			argc -= 1;
+			continue;
+		}
 		break;
 	}
 	if (*argp && !strcmp(*argp, "--monitor")) {
diff --git a/internal.h b/internal.h
index 935ebac3ca2e..27da8eac57bb 100644
--- a/internal.h
+++ b/internal.h
@@ -225,6 +225,7 @@ struct cmd_context {
 	char **argp;		/* arguments to the sub-command */
 	unsigned long debug;	/* debugging mask */
 	bool json;		/* Output JSON, if supported */
+	bool show_stats;	/* include command-specific stats */
 #ifdef ETHTOOL_ENABLE_NETLINK
 	struct nl_context *nlctx;	/* netlink context (opaque) */
 #endif
-- 
2.26.2