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lib: add backup-nexthop value to nexthop

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Add a field supporting a backup nexthop.

Signed-off-by: Mark Stapp <mjs@voltanet.io>
This commit is contained in:
Mark Stapp 2020-01-16 16:24:16 -05:00
parent bf1626a6b1
commit defd2ea4a1
2 changed files with 35 additions and 5 deletions
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31
lib/nexthop.c
View File

@ -23,11 +23,9 @@
#include "table.h"
#include "memory.h"
#include "command.h"
#include "if.h"
#include "log.h"
#include "sockunion.h"
#include "linklist.h"
#include "thread.h"
#include "prefix.h"
#include "nexthop.h"
#include "mpls.h"
@ -155,7 +153,24 @@ static int _nexthop_cmp_no_labels(const struct nexthop *next1,
}
ret = _nexthop_source_cmp(next1, next2);
if (ret != 0)
goto done;
if (!CHECK_FLAG(next1->flags, NEXTHOP_FLAG_HAS_BACKUP) &&
CHECK_FLAG(next2->flags, NEXTHOP_FLAG_HAS_BACKUP))
return -1;
if (CHECK_FLAG(next1->flags, NEXTHOP_FLAG_HAS_BACKUP) &&
!CHECK_FLAG(next2->flags, NEXTHOP_FLAG_HAS_BACKUP))
return 1;
if (next1->backup_idx < next2->backup_idx)
return -1;
if (next1->backup_idx > next2->backup_idx)
return 1;
done:
return ret;
}
@ -240,7 +255,7 @@ struct nexthop *nexthop_new(void)
* The linux kernel does some weird stuff with adding +1 to
* all nexthop weights it gets over netlink.
* To handle this, just default everything to 1 right from
* from the beggining so we don't have to special case
* from the beginning so we don't have to special case
* default weights in the linux netlink code.
*
* 1 should be a valid on all platforms anyway.
@ -508,6 +523,7 @@ unsigned int nexthop_level(struct nexthop *nexthop)
uint32_t nexthop_hash_quick(const struct nexthop *nexthop)
{
uint32_t key = 0x45afe398;
uint32_t val;
key = jhash_3words(nexthop->type, nexthop->vrf_id,
nexthop->nh_label_type, key);
@ -537,8 +553,12 @@ uint32_t nexthop_hash_quick(const struct nexthop *nexthop)
key = jhash_1word(nexthop->nh_label->label[i], key);
}
key = jhash_2words(nexthop->ifindex,
CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ONLINK),
val = 0;
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_HAS_BACKUP))
val = (uint32_t)nexthop->backup_idx;
key = jhash_3words(nexthop->ifindex,
CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ONLINK), val,
key);
return key;
@ -578,6 +598,7 @@ void nexthop_copy_no_recurse(struct nexthop *copy,
copy->type = nexthop->type;
copy->flags = nexthop->flags;
copy->weight = nexthop->weight;
copy->backup_idx = nexthop->backup_idx;
memcpy(&copy->gate, &nexthop->gate, sizeof(nexthop->gate));
memcpy(&copy->src, &nexthop->src, sizeof(nexthop->src));
memcpy(&copy->rmap_src, &nexthop->rmap_src, sizeof(nexthop->rmap_src));

9
lib/nexthop.h
View File

@ -86,6 +86,8 @@ struct nexthop {
* active one
*/
#define NEXTHOP_FLAG_RNH_FILTERED (1 << 5) /* rmap filtered, used by rnh */
#define NEXTHOP_FLAG_HAS_BACKUP (1 << 6) /* Backup nexthop index is set */
#define NEXTHOP_IS_ACTIVE(flags) \
(CHECK_FLAG(flags, NEXTHOP_FLAG_ACTIVE) \
&& !CHECK_FLAG(flags, NEXTHOP_FLAG_DUPLICATE))
@ -116,8 +118,15 @@ struct nexthop {
/* Weight of the nexthop ( for unequal cost ECMP ) */
uint8_t weight;
/* Index of a corresponding backup nexthop in a backup list;
* only meaningful if the HAS_BACKUP flag is set.
*/
uint8_t backup_idx;
};
/* Backup index value is limited */
#define NEXTHOP_BACKUP_IDX_MAX 255
/* Utility to append one nexthop to another. */
#define NEXTHOP_APPEND(to, new) \