netdev - [PATCH 1/2] samples: pktgen: add some helper functions for port parsing

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Message-Id: <20190629133358.8251-1-danieltimlee@gmail.com>
Date:   Sat, 29 Jun 2019 22:33:57 +0900
From:   "Daniel T. Lee" <danieltimlee@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: [PATCH 1/2] samples: pktgen: add some helper functions for port parsing

This commit adds port parsing and port validate helper function to parse
single or range of port(s) from a given string. (e.g. 1234, 443-444)

Helpers will be used in prior to set target port(s) in samples/pktgen.

Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
---
 samples/pktgen/functions.sh | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/samples/pktgen/functions.sh b/samples/pktgen/functions.sh
index f8bb3cd0f4ce..4af4046d71be 100644
--- a/samples/pktgen/functions.sh
+++ b/samples/pktgen/functions.sh
@@ -162,3 +162,37 @@ function get_node_cpus()
 
 	echo $node_cpu_list
 }
+
+# Given a single or range of port(s), return minimum and maximum port number.
+function parse_ports()
+{
+    local port_str=$1
+    local port_list
+    local min_port
+    local max_port
+
+    IFS="-" read -ra port_list <<< $port_str
+
+    min_port=${port_list[0]}
+    max_port=${port_list[1]:-$min_port}
+
+    echo $min_port $max_port
+}
+
+# Given a minimum and maximum port, verify port number.
+function validate_ports()
+{
+    local min_port=$1
+    local max_port=$2
+
+    # 0 < port < 65536
+    if [[ $min_port -gt 0 && $min_port -lt 65536 ]]; then
+	if [[ $max_port -gt 0 && $max_port -lt 65536 ]]; then
+	    if [[ $min_port -le $max_port ]]; then
+		return 0
+	    fi
+	fi
+    fi
+
+    err 5 "Invalid port(s): $min_port-$max_port"
+}
-- 
2.17.1