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nexthop: Add netlink defines and enumerators for resilient NH groups

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- RTM_NEWNEXTHOP et.al. that handle resilient groups will have a new nested
  attribute, NHA_RES_GROUP, whose elements are attributes NHA_RES_GROUP_*.

- RTM_NEWNEXTHOPBUCKET et.al. is a suite of new messages that will
  currently serve only for dumping of individual buckets of resilient next
  hop groups. For nexthop group buckets, these messages will carry a nested
  attribute NHA_RES_BUCKET, whose elements are attributes NHA_RES_BUCKET_*.

  There are several reasons why a new suite of messages is created for
  nexthop buckets instead of overloading the information on the existing
  RTM_{NEW,DEL,GET}NEXTHOP messages.

  First, a nexthop group can contain a large number of nexthop buckets (4k
  is not unheard of). This imposes limits on the amount of information that
  can be encoded for each nexthop bucket given a netlink message is limited
  to 64k bytes.

  Second, while RTM_NEWNEXTHOPBUCKET is only used for notifications at
  this point, in the future it can be extended to provide user space with
  control over nexthop buckets configuration.

- The new group type is NEXTHOP_GRP_TYPE_RES. Note that nexthop code is
  adjusted to bounce groups with that type for now.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel
2021-03-11 19:03:15 +01:00
committed by David S. Miller
parent 90e1a9e213
commit 710ec56223
4 changed files with 59 additions and 2 deletions
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47
include/uapi/linux/nexthop.h
View File

@@ -21,7 +21,10 @@ struct nexthop_grp {
};
enum {
NEXTHOP_GRP_TYPE_MPATH, /* default type if not specified */
NEXTHOP_GRP_TYPE_MPATH, /* hash-threshold nexthop group
* default type if not specified
*/
NEXTHOP_GRP_TYPE_RES, /* resilient nexthop group */
__NEXTHOP_GRP_TYPE_MAX,
};
@@ -52,8 +55,50 @@ enum {
NHA_FDB, /* flag; nexthop belongs to a bridge fdb */
/* if NHA_FDB is added, OIF, BLACKHOLE, ENCAP cannot be set */
/* nested; resilient nexthop group attributes */
NHA_RES_GROUP,
/* nested; nexthop bucket attributes */
NHA_RES_BUCKET,
__NHA_MAX,
};
#define NHA_MAX (__NHA_MAX - 1)
enum {
NHA_RES_GROUP_UNSPEC,
/* Pad attribute for 64-bit alignment. */
NHA_RES_GROUP_PAD = NHA_RES_GROUP_UNSPEC,
/* u16; number of nexthop buckets in a resilient nexthop group */
NHA_RES_GROUP_BUCKETS,
/* clock_t as u32; nexthop bucket idle timer (per-group) */
NHA_RES_GROUP_IDLE_TIMER,
/* clock_t as u32; nexthop unbalanced timer */
NHA_RES_GROUP_UNBALANCED_TIMER,
/* clock_t as u64; nexthop unbalanced time */
NHA_RES_GROUP_UNBALANCED_TIME,
__NHA_RES_GROUP_MAX,
};
#define NHA_RES_GROUP_MAX (__NHA_RES_GROUP_MAX - 1)
enum {
NHA_RES_BUCKET_UNSPEC,
/* Pad attribute for 64-bit alignment. */
NHA_RES_BUCKET_PAD = NHA_RES_BUCKET_UNSPEC,
/* u16; nexthop bucket index */
NHA_RES_BUCKET_INDEX,
/* clock_t as u64; nexthop bucket idle time */
NHA_RES_BUCKET_IDLE_TIME,
/* u32; nexthop id assigned to the nexthop bucket */
NHA_RES_BUCKET_NH_ID,
__NHA_RES_BUCKET_MAX,
};
#define NHA_RES_BUCKET_MAX (__NHA_RES_BUCKET_MAX - 1)
#endif