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Merge pull request #3477 from donaldsharp/multipath_respect

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zebra: Allow zebra to only mark up to multipath_num nexthops as ACTIVE
This commit is contained in:
Russ White 2018-12-13 10:41:26 -05:00 committed by GitHub
commit f4aaa03907
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2 changed files with 14 additions and 15 deletions
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16
zebra/rt_netlink.c
View File

@ -1584,7 +1584,7 @@ static int netlink_route_multipath(int cmd, struct zebra_dplane_ctx *ctx)
}
/* Singlepath case. */
if (nexthop_num == 1 || multipath_num == 1) {
if (nexthop_num == 1) {
nexthop_num = 0;
for (ALL_NEXTHOPS_PTR(dplane_ctx_get_ng(ctx), nexthop)) {
/*
@ -1676,9 +1676,6 @@ static int netlink_route_multipath(int cmd, struct zebra_dplane_ctx *ctx)
nexthop_num = 0;
for (ALL_NEXTHOPS_PTR(dplane_ctx_get_ng(ctx), nexthop)) {
if (nexthop_num >= multipath_num)
break;
if (CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_RECURSIVE)) {
/* This only works for IPv4 now */
@ -1876,12 +1873,6 @@ enum zebra_dplane_result kernel_route_update(struct zebra_dplane_ctx *ctx)
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)) {
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
/* If we're only allowed a single nh, don't
* continue.
*/
if (multipath_num == 1)
break;
}
}
}
@ -2698,7 +2689,7 @@ int netlink_mpls_multipath(int cmd, zebra_lsp_t *lsp)
/* Fill nexthops (paths) based on single-path or multipath. The paths
* chosen depend on the operation.
*/
if (nexthop_num == 1 || multipath_num == 1) {
if (nexthop_num == 1) {
routedesc = "single-path";
_netlink_mpls_debug(cmd, lsp->ile.in_label, routedesc);
@ -2745,9 +2736,6 @@ int netlink_mpls_multipath(int cmd, zebra_lsp_t *lsp)
if (!nexthop)
continue;
if (nexthop_num >= multipath_num)
break;
if ((cmd == RTM_NEWROUTE
&& (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED)
&& CHECK_FLAG(nexthop->flags,

13
zebra/zebra_rib.c
View File

@ -971,7 +971,18 @@ static int nexthop_active_update(struct route_node *rn, struct route_entry *re,
prev_src = nexthop->rmap_src;
prev_active = CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
prev_index = nexthop->ifindex;
if ((new_active = nexthop_active_check(rn, re, nexthop, set)))
/*
* We need to respect the multipath_num here
* as that what we should be able to install from
* a multipath perpsective should not be a data plane
* decision point.
*/
new_active = nexthop_active_check(rn, re, nexthop, set);
if (new_active && re->nexthop_active_num >= multipath_num) {
UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
new_active = 0;
}
if (new_active)
re->nexthop_active_num++;
/* Don't allow src setting on IPv6 addr for now */
if (prev_active != new_active || prev_index != nexthop->ifindex