3ad7a4b141
Vxlan COLLECT_METADATA mode today solves the per-vni netdev
scalability problem in l3 networks. It expects all forwarding
information to be present in dst_metadata. This patch series
enhances collect metadata mode to include the case where only
vni is present in dst_metadata, and the vxlan driver can then use
the rest of the forwarding information datbase to make forwarding
decisions. There is no change to default COLLECT_METADATA
behaviour. These changes only apply to COLLECT_METADATA when
used with the bridging use-case with a special dst_metadata
tunnel info flag (eg: where vxlan device is part of a bridge).
For all this to work, the vxlan driver will need to now support a
single fdb table hashed by mac + vni. This series essentially makes
this happen.
use-case and workflow:
vxlan collect metadata device participates in bridging vlan
to vn-segments. Bridge driver above the vxlan device,
sends the vni corresponding to the vlan in the dst_metadata.
vxlan driver will lookup forwarding database with (mac + vni)
for the required remote destination information to forward the
packet.
Changes introduced by this patch:
- allow learning and forwarding database state in vxlan netdev in
COLLECT_METADATA mode. Current behaviour is not changed
by default. tunnel info flag IP_TUNNEL_INFO_BRIDGE is used
to support the new bridge friendly mode.
- A single fdb table hashed by (mac, vni) to allow fdb entries with
multiple vnis in the same fdb table
- rx path already has the vni
- tx path expects a vni in the packet with dst_metadata
- prior to this series, fdb remote_dsts carried remote vni and
the vxlan device carrying the fdb table represented the
source vni. With the vxlan device now representing multiple vnis,
this patch adds a src vni attribute to the fdb entry. The remote
vni already uses NDA_VNI attribute. This patch introduces
NDA_SRC_VNI netlink attribute to represent the src vni in a multi
vni fdb table.
iproute2 example (patched and pruned iproute2 output to just show
relevant fdb entries):
example shows same host mac learnt on two vni's.
before (netdev per vni):
$bridge fdb show | grep "00:02:00:00:00:03"
00:02:00:00:00:03 dev vxlan1001 dst 12.0.0.8 self
00:02:00:00:00:03 dev vxlan1000 dst 12.0.0.8 self
after this patch with collect metadata in bridged mode (single netdev):
$bridge fdb show | grep "00:02:00:00:00:03"
00:02:00:00:00:03 dev vxlan0 src_vni 1001 dst 12.0.0.8 self
00:02:00:00:00:03 dev vxlan0 src_vni 1000 dst 12.0.0.8 self
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
171 lines
4.1 KiB
C
171 lines
4.1 KiB
C
#ifndef __LINUX_NEIGHBOUR_H
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#define __LINUX_NEIGHBOUR_H
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#include <linux/types.h>
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#include <linux/netlink.h>
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struct ndmsg {
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__u8 ndm_family;
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__u8 ndm_pad1;
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__u16 ndm_pad2;
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__s32 ndm_ifindex;
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__u16 ndm_state;
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__u8 ndm_flags;
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__u8 ndm_type;
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};
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enum {
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NDA_UNSPEC,
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NDA_DST,
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NDA_LLADDR,
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NDA_CACHEINFO,
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NDA_PROBES,
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NDA_VLAN,
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NDA_PORT,
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NDA_VNI,
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NDA_IFINDEX,
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NDA_MASTER,
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NDA_LINK_NETNSID,
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NDA_SRC_VNI,
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__NDA_MAX
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};
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#define NDA_MAX (__NDA_MAX - 1)
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/*
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* Neighbor Cache Entry Flags
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*/
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#define NTF_USE 0x01
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#define NTF_SELF 0x02
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#define NTF_MASTER 0x04
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#define NTF_PROXY 0x08 /* == ATF_PUBL */
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#define NTF_EXT_LEARNED 0x10
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#define NTF_ROUTER 0x80
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/*
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* Neighbor Cache Entry States.
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*/
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#define NUD_INCOMPLETE 0x01
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#define NUD_REACHABLE 0x02
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#define NUD_STALE 0x04
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#define NUD_DELAY 0x08
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#define NUD_PROBE 0x10
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#define NUD_FAILED 0x20
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/* Dummy states */
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#define NUD_NOARP 0x40
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#define NUD_PERMANENT 0x80
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#define NUD_NONE 0x00
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/* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change
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and make no address resolution or NUD.
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NUD_PERMANENT also cannot be deleted by garbage collectors.
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*/
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struct nda_cacheinfo {
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__u32 ndm_confirmed;
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__u32 ndm_used;
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__u32 ndm_updated;
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__u32 ndm_refcnt;
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};
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/*****************************************************************
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* Neighbour tables specific messages.
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*
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* To retrieve the neighbour tables send RTM_GETNEIGHTBL with the
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* NLM_F_DUMP flag set. Every neighbour table configuration is
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* spread over multiple messages to avoid running into message
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* size limits on systems with many interfaces. The first message
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* in the sequence transports all not device specific data such as
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* statistics, configuration, and the default parameter set.
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* This message is followed by 0..n messages carrying device
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* specific parameter sets.
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* Although the ordering should be sufficient, NDTA_NAME can be
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* used to identify sequences. The initial message can be identified
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* by checking for NDTA_CONFIG. The device specific messages do
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* not contain this TLV but have NDTPA_IFINDEX set to the
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* corresponding interface index.
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*
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* To change neighbour table attributes, send RTM_SETNEIGHTBL
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* with NDTA_NAME set. Changeable attribute include NDTA_THRESH[1-3],
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* NDTA_GC_INTERVAL, and all TLVs in NDTA_PARMS unless marked
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* otherwise. Device specific parameter sets can be changed by
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* setting NDTPA_IFINDEX to the interface index of the corresponding
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* device.
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****/
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struct ndt_stats {
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__u64 ndts_allocs;
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__u64 ndts_destroys;
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__u64 ndts_hash_grows;
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__u64 ndts_res_failed;
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__u64 ndts_lookups;
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__u64 ndts_hits;
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__u64 ndts_rcv_probes_mcast;
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__u64 ndts_rcv_probes_ucast;
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__u64 ndts_periodic_gc_runs;
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__u64 ndts_forced_gc_runs;
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__u64 ndts_table_fulls;
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};
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enum {
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NDTPA_UNSPEC,
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NDTPA_IFINDEX, /* u32, unchangeable */
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NDTPA_REFCNT, /* u32, read-only */
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NDTPA_REACHABLE_TIME, /* u64, read-only, msecs */
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NDTPA_BASE_REACHABLE_TIME, /* u64, msecs */
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NDTPA_RETRANS_TIME, /* u64, msecs */
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NDTPA_GC_STALETIME, /* u64, msecs */
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NDTPA_DELAY_PROBE_TIME, /* u64, msecs */
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NDTPA_QUEUE_LEN, /* u32 */
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NDTPA_APP_PROBES, /* u32 */
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NDTPA_UCAST_PROBES, /* u32 */
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NDTPA_MCAST_PROBES, /* u32 */
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NDTPA_ANYCAST_DELAY, /* u64, msecs */
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NDTPA_PROXY_DELAY, /* u64, msecs */
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NDTPA_PROXY_QLEN, /* u32 */
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NDTPA_LOCKTIME, /* u64, msecs */
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NDTPA_QUEUE_LENBYTES, /* u32 */
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NDTPA_MCAST_REPROBES, /* u32 */
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NDTPA_PAD,
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__NDTPA_MAX
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};
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#define NDTPA_MAX (__NDTPA_MAX - 1)
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struct ndtmsg {
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__u8 ndtm_family;
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__u8 ndtm_pad1;
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__u16 ndtm_pad2;
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};
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struct ndt_config {
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__u16 ndtc_key_len;
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__u16 ndtc_entry_size;
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__u32 ndtc_entries;
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__u32 ndtc_last_flush; /* delta to now in msecs */
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__u32 ndtc_last_rand; /* delta to now in msecs */
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__u32 ndtc_hash_rnd;
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__u32 ndtc_hash_mask;
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__u32 ndtc_hash_chain_gc;
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__u32 ndtc_proxy_qlen;
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};
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enum {
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NDTA_UNSPEC,
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NDTA_NAME, /* char *, unchangeable */
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NDTA_THRESH1, /* u32 */
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NDTA_THRESH2, /* u32 */
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NDTA_THRESH3, /* u32 */
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NDTA_CONFIG, /* struct ndt_config, read-only */
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NDTA_PARMS, /* nested TLV NDTPA_* */
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NDTA_STATS, /* struct ndt_stats, read-only */
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NDTA_GC_INTERVAL, /* u64, msecs */
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NDTA_PAD,
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__NDTA_MAX
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};
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#define NDTA_MAX (__NDTA_MAX - 1)
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#endif
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