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net sched actions: Complete the JUMPX opcode
per discussion at netconf/netdev: When we have an action that is capable of branching (example a policer), we can achieve a continuation of the action graph by programming a "continue" where we find an exact replica of the same filter rule with a lower priority and the remainder of the action graph. When you have 100s of thousands of filters which require such a feature it gets very inefficient to do two lookups. This patch completes a leftover feature of action codes. Its time has come. Example below where a user labels packets with a different skbmark on ingress of a port depending on whether they have/not exceeded the configured rate. This mark is then used to make further decisions on some egress port. #rate control, very low so we can easily see the effect sudo $TC actions add action police rate 1kbit burst 90k \ conform-exceed pipe/jump 2 index 10 # skbedit index 11 will be used if the user conforms sudo $TC actions add action skbedit mark 11 ok index 11 # skbedit index 12 will be used if the user does not conform sudo $TC actions add action skbedit mark 12 ok index 12 #lets bind the user .. sudo $TC filter add dev $ETH parent ffff: protocol ip prio 8 u32 \ match ip dst 127.0.0.8/32 flowid 1:10 \ action police index 10 \ action skbedit index 11 \ action skbedit index 12 #run a ping -f and see what happens.. # jhs@foobar:~$ sudo $TC -s filter ls dev $ETH parent ffff: protocol ip filter pref 8 u32 filter pref 8 u32 fh 800: ht divisor 1 filter pref 8 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:10 (rule hit 2800 success 1005) match 7f000008/ffffffff at 16 (success 1005 ) action order 1: police 0xa rate 1Kbit burst 23440b mtu 2Kb action pipe/jump 2 overhead 0b ref 2 bind 1 installed 207 sec used 122 sec Action statistics: Sent 84420 bytes 1005 pkt (dropped 0, overlimits 721 requeues 0) backlog 0b 0p requeues 0 action order 2: skbedit mark 11 pass index 11 ref 2 bind 1 installed 204 sec used 122 sec Action statistics: Sent 60564 bytes 721 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 action order 3: skbedit mark 12 pass index 12 ref 2 bind 1 installed 201 sec used 122 sec Action statistics: Sent 23856 bytes 284 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 Not bad, about 28% non-conforming packets.. Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -428,24 +428,49 @@ static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
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return res;
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}
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/*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
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#define TCA_ACT_MAX_PRIO_MASK 0x1FF
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int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
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int nr_actions, struct tcf_result *res)
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{
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int ret = -1, i;
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u32 jmp_prgcnt = 0;
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u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
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if (skb_skip_tc_classify(skb))
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return TC_ACT_OK;
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restart_act_graph:
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for (i = 0; i < nr_actions; i++) {
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const struct tc_action *a = actions[i];
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if (jmp_prgcnt > 0) {
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jmp_prgcnt -= 1;
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continue;
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}
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repeat:
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ret = a->ops->act(skb, a, res);
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if (ret == TC_ACT_REPEAT)
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goto repeat; /* we need a ttl - JHS */
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if (ret & TC_ACT_JUMP) {
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jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
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if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
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/* faulty opcode, stop pipeline */
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return TC_ACT_OK;
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} else {
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jmp_ttl -= 1;
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if (jmp_ttl > 0)
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goto restart_act_graph;
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else /* faulty graph, stop pipeline */
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return TC_ACT_OK;
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}
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}
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if (ret != TC_ACT_PIPE)
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break;
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}
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return ret;
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}
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EXPORT_SYMBOL(tcf_action_exec);
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