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dpif: Fix slow action handling for DP_HASH and RECIRC

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In case DP_HASH and RECIRC actions need to be executed in slow path,
current implementation simply don't handle them -- vswitchd simply
crashes. This patch fixes them by supply an implementation for them.

RECIRC will be handled by the datapath, same as the output action.

DP_HASH, on the other hand, is handled in the user space. Although the
resulting hash values may not match those computed by the datapath, it
is less expensive; current use case (bonding) does not require a strict
match to work properly.

Reported-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
This commit is contained in:
Andy Zhou
2014-05-28 17:00:48 -07:00
parent 50a1a1d2cc
commit c6bf49f3fa
2 changed files with 24 additions and 3 deletions
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23
lib/odp-execute.c
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@@ -26,6 +26,7 @@
#include "ofpbuf.h"
#include "odp-util.h"
#include "packets.h"
#include "flow.h"
#include "unaligned.h"
#include "util.h"
@@ -208,7 +209,6 @@ odp_execute_actions__(void *dp, struct ofpbuf *packet, bool steal,
case OVS_ACTION_ATTR_OUTPUT:
case OVS_ACTION_ATTR_USERSPACE:
case OVS_ACTION_ATTR_RECIRC:
case OVS_ACTION_ATTR_HASH:
if (dp_execute_action) {
/* Allow 'dp_execute_action' to steal the packet data if we do
* not need it any more. */
@@ -219,6 +219,27 @@ odp_execute_actions__(void *dp, struct ofpbuf *packet, bool steal,
}
break;
case OVS_ACTION_ATTR_HASH: {
const struct ovs_action_hash *hash_act = nl_attr_get(a);
/* Calculate a hash value directly. This might not match the
* value computed by the datapath, but it is much less expensive,
* and the current use case (bonding) does not require a strict
* match to work properly. */
if (hash_act->hash_alg == OVS_HASH_ALG_L4) {
struct flow flow;
uint32_t hash;
flow_extract(packet, md, &flow);
hash = flow_hash_5tuple(&flow, hash_act->hash_basis);
md->dp_hash = hash ? hash : 1;
} else {
/* Assert on unknown hash algorithm. */
OVS_NOT_REACHED();
}
break;
}
case OVS_ACTION_ATTR_PUSH_VLAN: {
const struct ovs_action_push_vlan *vlan = nl_attr_get(a);
eth_push_vlan(packet, htons(ETH_TYPE_VLAN), vlan->vlan_tci);