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authorBen Pfaff <blp@nicira.com>2013-02-15 17:29:22 -0800
committerJesse Gross <jesse@nicira.com>2013-02-22 16:29:22 -0800
commit4490108b4a5ada14c7be712260829faecc814ae5 (patch)
tree1a8aa00a6e518cd597b8ffda27f5e357c998a33b /net/openvswitch
parent14408dba8440ef629a3a2827bc4c7b5045889295 (diff)
downloadop-kernel-dev-4490108b4a5ada14c7be712260829faecc814ae5.zip
op-kernel-dev-4490108b4a5ada14c7be712260829faecc814ae5.tar.gz
openvswitch: Allow OVS_USERSPACE_ATTR_USERDATA to be variable length.
Until now, the optional OVS_USERSPACE_ATTR_USERDATA attribute had to be exactly 64 bits long, if it was present. However, 64 bits is not enough space to associate as much information with a flow as would be convenient for some userspace features now under development. This commit generalizes the attribute, allowing it to be any length. This generalization is backward-compatible: if userspace only uses 64-bit attributes, then it will not see any change in behavior. CC: Romain Lenglet <rlenglet@vmware.com> Signed-off-by: Ben Pfaff <blp@nicira.com> Signed-off-by: Jesse Gross <jesse@nicira.com>
Diffstat (limited to 'net/openvswitch')
-rw-r--r--net/openvswitch/datapath.c11
-rw-r--r--net/openvswitch/datapath.h2
2 files changed, 7 insertions, 6 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index f9d2438..96cd5b2 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -370,8 +370,8 @@ static int queue_userspace_packet(struct net *net, int dp_ifindex,
len = sizeof(struct ovs_header);
len += nla_total_size(skb->len);
len += nla_total_size(FLOW_BUFSIZE);
- if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
- len += nla_total_size(8);
+ if (upcall_info->userdata)
+ len += NLA_ALIGN(upcall_info->userdata->nla_len);
user_skb = genlmsg_new(len, GFP_ATOMIC);
if (!user_skb) {
@@ -388,8 +388,9 @@ static int queue_userspace_packet(struct net *net, int dp_ifindex,
nla_nest_end(user_skb, nla);
if (upcall_info->userdata)
- nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
- nla_get_u64(upcall_info->userdata));
+ __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
+ nla_len(upcall_info->userdata),
+ nla_data(upcall_info->userdata));
nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
@@ -544,7 +545,7 @@ static int validate_userspace(const struct nlattr *attr)
{
static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
[OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
- [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
+ [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
};
struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
int error;
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index 031dfbf..9125ad5 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -119,7 +119,7 @@ struct ovs_skb_cb {
* struct dp_upcall - metadata to include with a packet to send to userspace
* @cmd: One of %OVS_PACKET_CMD_*.
* @key: Becomes %OVS_PACKET_ATTR_KEY. Must be nonnull.
- * @userdata: If nonnull, its u64 value is extracted and passed to userspace as
+ * @userdata: If nonnull, its variable-length value is passed to userspace as
* %OVS_PACKET_ATTR_USERDATA.
* @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
* packet is sent and the packet is accounted in the datapath's @n_lost
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