iptuntap: allow creation of multi-queue tun/tap device

This patch adds multi_queue option to ip tuntap.
This allows IFF_MULTI_QUEUE flag to be specified during
tun/tap device creation enabling multi-queue support in tun/tap
device.

Example: ip tuntap add dev tap0 mode tap multi_queue

Signed-off-by: Sriram Narasimhan <sriram.narasimhan@hp.com>

diff --git a/ip/iptuntap.c b/ip/iptuntap.c
index 3d9ad7dedd1db179396842621e08859e79e26b23..2391af2bf923bf05a259b17aa247626e42ded3a7 100644 (file)
--- a/ip/iptuntap.c
+++ b/ip/iptuntap.c
@@ -38,7 +38,7 @@ static void usage(void)
 {
        fprintf(stderr, "Usage: ip tuntap { add | del } [ dev PHYS_DEV ] \n");
        fprintf(stderr, "          [ mode { tun | tap } ] [ user USER ] [ group GROUP ]\n");
-       fprintf(stderr, "          [ one_queue ] [ pi ] [ vnet_hdr ]\n");
+       fprintf(stderr, "          [ one_queue ] [ pi ] [ vnet_hdr ] [ multi_queue ]\n");
        fprintf(stderr, "\n");
        fprintf(stderr, "Where: USER  := { STRING | NUMBER }\n");
        fprintf(stderr, "       GROUP := { STRING | NUMBER }\n");
@@ -168,6 +168,8 @@ static int parse_args(int argc, char **argv, struct ifreq *ifr, uid_t *uid, gid_
                        ifr->ifr_flags |= IFF_ONE_QUEUE;
                } else if (matches(*argv, "vnet_hdr") == 0) {
                        ifr->ifr_flags |= IFF_VNET_HDR;
+               } else if (matches(*argv, "multi_queue") == 0) {
+                       ifr->ifr_flags |= IFF_MULTI_QUEUE;
                } else if (matches(*argv, "dev") == 0) {
                        NEXT_ARG();
                        strncpy(ifr->ifr_name, *argv, IFNAMSIZ-1);