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Limit route nexthops to 8 for eBPF #1039 #1041

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Merged
backguynn merged 2 commits into from
Dec 11, 2025
Merged

Limit route nexthops to 8 for eBPF #1039 #1041

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377ff8a
Limit route nexthops to 8 for eBPF #1039
backguynn Dec 11, 2025
d18abf5
Merge branch 'loxilb-io:main' into main
backguynn Dec 11, 2025
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17 changes: 14 additions & 3 deletions pkg/loxinet/route.go
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Original file line number Diff line number Diff line change
Expand Up @@ -19,10 +19,11 @@ package loxinet
import (
"errors"
"fmt"
"net"

cmn "github.com/loxilb-io/loxilb/common"
opts "github.com/loxilb-io/loxilb/options"
tk "github.com/loxilb-io/loxilib"
"net"
)

// error codes
Expand Down Expand Up @@ -580,8 +581,18 @@ func (rt *Rt) DP(work DpWorkT) int {
rtWq.Dst = *rtNet
rtWq.RtType = rt.TFlags
rtWq.RtMark = int(rt.Mark)
rtWq.NMax = len(rt.NextHops)
for i := range rt.NextHops {

// Limit to 8 nexthops (NMark array size)
// eBPF kernel only supports up to 4 (DP_MAX_ACTIVE_PATHS)
maxNh := len(rt.NextHops)
if maxNh > 8 {
tk.LogIt(tk.LogWarning, "route %s has %d nexthops, limiting to 8 (eBPF supports max 4)\n",
rt.Key.RtCidr, maxNh)
maxNh = 8
}

rtWq.NMax = maxNh
for i := 0; i < maxNh; i++ {
rtWq.NMark[i] = int(rt.RtGetNhMark(i))
}

Expand Down
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