From 830a84019df408c04cdd4d1cb43f647b1db99252 Mon Sep 17 00:00:00 2001
From: Oliver Hartkopp <socketcan@hartkopp.net>
Date: Wed, 14 Feb 2024 21:18:58 +0100
Subject: [PATCH] isotprecv: add option to enable dynamic flow control
 parameters

New feature in Linux 6.9+

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
 isotprecv.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/isotprecv.c b/isotprecv.c
index e07e36a..35ba4d8 100644
--- a/isotprecv.c
+++ b/isotprecv.c
@@ -73,6 +73,7 @@ void print_usage(char *prg)
 	fprintf(stderr, "         -f <time ns>  (force rx stmin value in nanosecs)\n");
 	fprintf(stderr, "         -w <num>      (max. wait frame transmissions.)\n");
 	fprintf(stderr, "         -l            (loop: do not exit after pdu reception.)\n");
+	fprintf(stderr, "         -F            (enable dynamic flow control parameters)\n");
 	fprintf(stderr, "         -L <mtu>:<tx_dl>:<tx_flags>  (link layer options for CAN FD)\n");
 	fprintf(stderr, "\nCAN IDs and addresses are given and expected in hexadecimal values.\n");
 	fprintf(stderr, "The pdu data is written on STDOUT in space separated ASCII hex values.\n");
@@ -96,7 +97,7 @@ int main(int argc, char **argv)
 
     addr.can_addr.tp.tx_id = addr.can_addr.tp.rx_id = NO_CAN_ID;
 
-    while ((opt = getopt(argc, argv, "s:d:x:p:P:b:m:w:f:lL:?")) != -1) {
+    while ((opt = getopt(argc, argv, "s:d:x:p:P:b:m:w:f:lFL:?")) != -1) {
 	    switch (opt) {
 	    case 's':
 		    addr.can_addr.tp.tx_id = strtoul(optarg, NULL, 16);
@@ -183,6 +184,10 @@ int main(int argc, char **argv)
 		    loop = 1;
 		    break;
 
+	    case 'F':
+		    opts.flags |= CAN_ISOTP_DYN_FC_PARMS;
+		    break;
+
 	    case 'L':
 		    if (sscanf(optarg, "%hhu:%hhu:%hhu",
 			       &llopts.mtu,