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userspace: Switching of L3 packets in L2 pipeline

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Ports have a new layer3 attribute if they send/receive L3 packets.

The packet_type included in structs dp_packet and flow is considered in
ofproto-dpif. The classical L2 match fields (dl_src, dl_dst, dl_type, and
vlan_tci, vlan_vid, vlan_pcp) now have Ethernet as pre-requisite.

A dummy ethernet header is pushed to L3 packets received from L3 ports
before the the pipeline processing starts. The ethernet header is popped
before sending a packet to a L3 port.

For datapath ports that can receive L2 or L3 packets, the packet_type
becomes part of the flow key for datapath flows and is handled
appropriately in dpif-netdev.

In the 'else' branch in flow_put_on_pmd() function, the additional check
flow_equal(&match.flow, &netdev_flow->flow) was removed, as a) the dpcls
lookup is sufficient to uniquely identify a flow and b) it caused false
negatives because the flow in netdev->flow may not properly masked.

In dpif_netdev_flow_put() we now use the same method for constructing the
netdev_flow_key as the one used when adding the flow to the dplcs to make sure
these always match. The function netdev_flow_key_from_flow() used so far was
not only inefficient but sometimes caused mismatches and subsequent flow
update failures.

The kernel datapath does not support the packet_type match field.
Instead it encodes the packet type implictly by the presence or absence of
the Ethernet attribute in the flow key and mask.
This patch filters the PACKET_TYPE attribute out of netlink flow key and
mask to be sent to the kernel datapath.

Signed-off-by: Lorand Jakab <lojakab@cisco.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: Yi Yang <yi.y.yang@intel.com>
Signed-off-by: Jan Scheurich <jan.scheurich@ericsson.com>
Co-authored-by: Zoltan Balogh <zoltan.balogh@ericsson.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Jan Scheurich
2017-06-02 16:16:17 +00:00
committed by Ben Pfaff
parent 5978c2e315
commit beb75a40fd
23 changed files with 337 additions and 119 deletions
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43
lib/dpif-netlink.c
View File

@@ -1636,7 +1636,7 @@ dpif_netlink_encode_execute(int dp_ifindex, const struct dpif_execute *d_exec,
dp_packet_size(d_exec->packet));
key_ofs = nl_msg_start_nested(buf, OVS_PACKET_ATTR_KEY);
odp_key_from_pkt_metadata(buf, &d_exec->packet->md);
odp_key_from_dp_packet(buf, d_exec->packet);
nl_msg_end_nested(buf, key_ofs);
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_ACTIONS,
@@ -2984,6 +2984,38 @@ dpif_netlink_flow_from_ofpbuf(struct dpif_netlink_flow *flow,
return 0;
}
/*
* If PACKET_TYPE attribute is present in 'data', it filters PACKET_TYPE out,
* then puts 'data' to 'buf'.
*/
static void
put_exclude_packet_type(struct ofpbuf *buf, uint16_t type,
const struct nlattr *data, uint16_t data_len)
{
const struct nlattr *packet_type;
packet_type = nl_attr_find__(data, data_len, OVS_KEY_ATTR_PACKET_TYPE);
if (packet_type) {
/* exclude PACKET_TYPE Netlink attribute. */
ovs_assert(NLA_ALIGN(packet_type->nla_len) == NL_A_U32_SIZE);
size_t packet_type_len = NL_A_U32_SIZE;
size_t first_chunk_size = (uint8_t *)packet_type - (uint8_t *)data;
size_t second_chunk_size = data_len - first_chunk_size
- packet_type_len;
uint8_t *first_attr = NULL;
struct nlattr *next_attr = nl_attr_next(packet_type);
first_attr = nl_msg_put_unspec_uninit(buf, type,
data_len - packet_type_len);
memcpy(first_attr, data, first_chunk_size);
memcpy(first_attr + first_chunk_size, next_attr, second_chunk_size);
} else {
nl_msg_put_unspec(buf, type, data, data_len);
}
}
/* Appends to 'buf' (which must initially be empty) a "struct ovs_header"
* followed by Netlink attributes corresponding to 'flow'. */
static void
@@ -3010,13 +3042,12 @@ dpif_netlink_flow_to_ofpbuf(const struct dpif_netlink_flow *flow,
}
if (!flow->ufid_terse || !flow->ufid_present) {
if (flow->key_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_KEY,
flow->key, flow->key_len);
put_exclude_packet_type(buf, OVS_FLOW_ATTR_KEY, flow->key,
flow->key_len);
}
if (flow->mask_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_MASK,
flow->mask, flow->mask_len);
put_exclude_packet_type(buf, OVS_FLOW_ATTR_MASK, flow->mask,
flow->mask_len);
}
if (flow->actions || flow->actions_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_ACTIONS,