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ofp-actions: Add truncate action.

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The patch adds a new action to support packet truncation.  The new action
is formatted as 'output(port=n,max_len=m)', as output to port n, with
packet size being MIN(original_size, m).

One use case is to enable port mirroring to send smaller packets to the
destination port so that only useful packet information is mirrored/copied,
saving some performance overhead of copying entire packet payload.  Example
use case is below as well as shown in the testcases:

    - Output to port 1 with max_len 100 bytes.
    - The output packet size on port 1 will be MIN(original_packet_size, 100).
    # ovs-ofctl add-flow br0 'actions=output(port=1,max_len=100)'

    - The scope of max_len is limited to output action itself.  The following
      packet size of output:1 and output:2 will be intact.
    # ovs-ofctl add-flow br0 \
            'actions=output(port=1,max_len=100),output:1,output:2'
    - The Datapath actions shows:
    # Datapath actions: trunc(100),1,1,2

Tested-at: https://travis-ci.org/williamtu/ovs-travis/builds/140037134
Signed-off-by: William Tu <u9012063@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
This commit is contained in:
William Tu
2016-06-24 07:42:30 -07:00
committed by Pravin B Shelar
parent 4c7804f14b
commit aaca4fe0ce
27 changed files with 848 additions and 4 deletions
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12
lib/odp-execute.c
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@@ -503,6 +503,7 @@ requires_datapath_assistance(const struct nlattr *a)
case OVS_ACTION_ATTR_HASH:
case OVS_ACTION_ATTR_PUSH_MPLS:
case OVS_ACTION_ATTR_POP_MPLS:
case OVS_ACTION_ATTR_TRUNC:
return false;
case OVS_ACTION_ATTR_UNSPEC:
@@ -625,6 +626,17 @@ odp_execute_actions(void *dp, struct dp_packet_batch *batch, bool steal,
}
break;
case OVS_ACTION_ATTR_TRUNC: {
const struct ovs_action_trunc *trunc =
nl_attr_get_unspec(a, sizeof *trunc);
batch->trunc = true;
for (i = 0; i < cnt; i++) {
dp_packet_set_cutlen(packets[i], trunc->max_len);
}
break;
}
case OVS_ACTION_ATTR_OUTPUT:
case OVS_ACTION_ATTR_TUNNEL_PUSH:
case OVS_ACTION_ATTR_TUNNEL_POP: