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38a6f08657
This patch allows users to pick queue_mapping, range
from A to B. Then we can load balance packets from A
to B tx queue. The range is an unsigned 16bit value
in decimal format.
$ tc filter ... action skbedit queue_mapping skbhash A B
"skbedit queue_mapping QUEUE_MAPPING" (from "man 8 tc-skbedit")
is enhanced with flags: SKBEDIT_F_TXQ_SKBHASH
+----+ +----+ +----+
| P1 | | P2 | | Pn |
+----+ +----+ +----+
| | |
+-----------+-----------+
|
| clsact/skbedit
| MQ
v
+-----------+-----------+
| q0 | qn | qm
v v v
HTB/FQ FIFO ... FIFO
For example:
If P1 sends out packets to different Pods on other host, and
we want distribute flows from qn - qm. Then we can use skb->hash
as hash.
setup commands:
$ NETDEV=eth0
$ ip netns add n1
$ ip link add ipv1 link $NETDEV type ipvlan mode l2
$ ip link set ipv1 netns n1
$ ip netns exec n1 ifconfig ipv1 2.2.2.100/24 up
$ tc qdisc add dev $NETDEV clsact
$ tc filter add dev $NETDEV egress protocol ip prio 1 \
flower skip_hw src_ip 2.2.2.100 action skbedit queue_mapping skbhash 2 6
$ tc qdisc add dev $NETDEV handle 1: root mq
$ tc qdisc add dev $NETDEV parent 1:1 handle 2: htb
$ tc class add dev $NETDEV parent 2: classid 2:1 htb rate 100kbit
$ tc class add dev $NETDEV parent 2: classid 2:2 htb rate 200kbit
$ tc qdisc add dev $NETDEV parent 1:2 tbf rate 100mbit burst 100mb latency 1
$ tc qdisc add dev $NETDEV parent 1:3 pfifo
$ tc qdisc add dev $NETDEV parent 1:4 pfifo
$ tc qdisc add dev $NETDEV parent 1:5 pfifo
$ tc qdisc add dev $NETDEV parent 1:6 pfifo
$ tc qdisc add dev $NETDEV parent 1:7 pfifo
$ ip netns exec n1 iperf3 -c 2.2.2.1 -i 1 -t 10 -P 10
pick txqueue from 2 - 6:
$ ethtool -S $NETDEV | grep -i tx_queue_[0-9]_bytes
tx_queue_0_bytes: 42
tx_queue_1_bytes: 0
tx_queue_2_bytes: 11442586444
tx_queue_3_bytes: 7383615334
tx_queue_4_bytes: 3981365579
tx_queue_5_bytes: 3983235051
tx_queue_6_bytes: 6706236461
tx_queue_7_bytes: 42
tx_queue_8_bytes: 0
tx_queue_9_bytes: 0
txqueues 2 - 6 are mapped to classid 1:3 - 1:7
$ tc -s class show dev $NETDEV
...
class mq 1:3 root leaf 8002:
Sent 11949133672 bytes 7929798 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
class mq 1:4 root leaf 8003:
Sent 7710449050 bytes 5117279 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
class mq 1:5 root leaf 8004:
Sent 4157648675 bytes
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|---|---|---|
| .. | ||
| tc_bpf.h | ||
| tc_connmark.h | ||
| tc_csum.h | ||
| tc_ct.h | ||
| tc_ctinfo.h | ||
| tc_defact.h | ||
| tc_gact.h | ||
| tc_gate.h | ||
| tc_ife.h | ||
| tc_ipt.h | ||
| tc_mirred.h | ||
| tc_mpls.h | ||
| tc_nat.h | ||
| tc_pedit.h | ||
| tc_police.h | ||
| tc_sample.h | ||
| tc_skbedit.h | ||
| tc_skbmod.h | ||
| tc_tunnel_key.h | ||
| tc_vlan.h | ||