config: allow changing config for existing ports

The "port" config word is not creating a new port any more, it locates an existing port, if any is there. This allows, for example, to set diagnostics from the command line: -C "port eth0; diagnostics 022" Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

config: allow changing config for existing ports
The "port" config word is not creating a new port any more, it locates an existing port, if any is there. This allows, for example, to set diagnostics from the command line: -C "port eth0; diagnostics 022" Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
b3c5e11e · Alessandro Rubini · c3a762b8 · b3c5e11e
Commit b3c5e11e authored Oct 16, 2013 by Alessandro Rubini
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conf.c lib/conf.c +10 -1

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--- a/lib/conf.c
+++ b/lib/conf.c
@@ -18,9 +18,18 @@
 static struct pp_globals *current_ppg;
 static struct pp_instance *current_ppi;

-/* A "port" (or "link", for compatibility) line creates a ppi instance */
+/* A "port" (or "link", for compatibility) line creates or uses a pp instance */
 static int f_port(int lineno, int iarg, char *sarg)
 {
+	int i;
+
+	/* First look for an existing port with the same name */
+	for (i = 0; i < current_ppg->nlinks; i++) {
+		current_ppi = current_ppg->pp_instances + i;
+		if (!strcmp(sarg, current_ppi->cfg.port_name))
+			return 0;
+	}
+	/* Allocate a new ppi */
 	if (current_ppg->nlinks >= current_ppg->max_links) {
 		pp_printf("config line %i: out of available ports\n",
 			  lineno);