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Message-ID: <20240210092107.53598a13@hermes.local>
Date: Sat, 10 Feb 2024 09:21:07 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: Takanori Hirano <me@...tknr.net>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 v2] tc: Add support json option in filter.

On Sat, 10 Feb 2024 10:08:03 +0000
Takanori Hirano <me@...tknr.net> wrote:

>  	if (tb[TCA_FLOW_MODE]) {
>  		__u32 mode = rta_getattr_u32(tb[TCA_FLOW_MODE]);
>  
>  		switch (mode) {
>  		case FLOW_MODE_MAP:
> -			fprintf(f, "map ");
> +			open_json_object("map");
> +			print_string(PRINT_FP, NULL, "map ", NULL);
>  			break;
>  		case FLOW_MODE_HASH:
> -			fprintf(f, "hash ");
> +			open_json_object("hash");
> +			print_string(PRINT_FP, NULL, "hash ", NULL);
>  			break;
>  		}
>  	}

Since this is two values for mode, in my version it looks like
 
+static const char *flow_mode2str(__u32 mode)
+{
+	static char buf[128];
+
+	switch (mode) {
+	case FLOW_MODE_MAP:
+		return "map";
+	case FLOW_MODE_HASH:
+		return "hash";
+	default:
+		snprintf(buf, sizeof(buf), "%#x", mode);
+		return buf;
+	}
+}
+

 
 	if (tb[TCA_FLOW_MODE]) {
 		__u32 mode = rta_getattr_u32(tb[TCA_FLOW_MODE]);
 
-		switch (mode) {
-		case FLOW_MODE_MAP:
-			fprintf(f, "map ");
-			break;
-		case FLOW_MODE_HASH:
-			fprintf(f, "hash ");
-			break;
-		}
+		print_string(PRINT_ANY, "mode", "%s ", flow_mode2str(mode));
 	}
 

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