net: pktgen: build skb list and call netif_receive_skb_list()

Build a batch with 8 skbuffs and inject them via netif_receive_skb_list.

Tested with:

echo 1 > /proc/sys/net/ipv4/ip_forward
modprobe dummy numdummies=1
ip link set up dev dummy0
ip ro add dev dummy0 scope link
cd linux-stk/samples/pktgen/
./ -i eth0 -n 1500000 -m xx:xx:xx:xx:xx:xx

where xx:xx:xx:xx:xx:xx is the mac address of eth0.

without flowtable:

Result: OK: 591472(c591472+d0) usec, 1204224 (60byte,0frags)
  254496pps 977Mb/sec (977264640bps) errors: 0

with flowtable:

Result: OK: 364031(c364031+d0) usec, 12001280 (60byte,0frags)
  4120962pps 15824Mb/sec (15824494080bps) errors: 0

 # cat ruleset.nft
 table ip x {
        flowtable x {
                hook ingress priority filter
                devices = { dummy0, eth0 }

        chain y {
                type filter hook forward priority filter; policy accept;
                flow add @x counter packets 4 bytes 184
                counter packets 64 bytes 2944

Update samples/pktgen/ to set
up source address different than the one of the ingress interface,
otherwise packets are dropped as martians.
2 files changed