From 4490108b4a5ada14c7be712260829faecc814ae5 Mon Sep 17 00:00:00 2001 From: Ben Pfaff Date: Fri, 15 Feb 2013 17:29:22 -0800 Subject: 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 Signed-off-by: Ben Pfaff Signed-off-by: Jesse Gross --- net/openvswitch/datapath.c | 11 ++++++----- net/openvswitch/datapath.h | 2 +- 2 files changed, 7 insertions(+), 6 deletions(-) (limited to 'net/openvswitch') diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index f9d2438e643..96cd5b243d5 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 031dfbf37c9..9125ad5c5ae 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 -- cgit v1.2.3-18-g5258