[dpdk-stable] [PATCH v8 1/5] examples/l3fwd: fix LPM IPv6 subnets

[dpdk-stable] [PATCH v8 1/5] examples/l3fwd: fix LPM IPv6 subnets

[Conor Walsh]

Any IP within the 2001:200::/48 subnet will match all the routes given
instead of 1 individual route and the application cannot
differentiate between them.
The change in this patch allows the ports to be individually matched using
smaller /64 ranges for each port. These smaller subnet ranges are still
within the 2001:200::/48 subnet range set aside for benchmarking
in RFC5180.
l3fwd will now use 2001:200:0:{0-7}::/64 where 0-7 is the port ID for IPv6.

Fixes: 37afe381bde4 ("examples/l3fwd: use reserved IP addresses")
CC: stable@dpdk.org

Signed-off-by: Conor Walsh <conor.walsh@intel.com>
Acked-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
---
 examples/l3fwd/l3fwd_lpm.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/examples/l3fwd/l3fwd_lpm.c b/examples/l3fwd/l3fwd_lpm.c
index 3dcf1fef18..1cfaf36572 100644
--- a/examples/l3fwd/l3fwd_lpm.c
+++ b/examples/l3fwd/l3fwd_lpm.c
@@ -42,7 +42,10 @@ struct ipv6_l3fwd_lpm_route {
 	uint8_t  if_out;
 };
 
-/* 198.18.0.0/16 are set aside for RFC2544 benchmarking (RFC5735). */
+/*
+ * 198.18.0.0/16 are set aside for RFC2544 benchmarking (RFC5735).
+ * 198.18.{0-7}.0/24 = Port {0-7}
+ */
 static const struct ipv4_l3fwd_lpm_route ipv4_l3fwd_lpm_route_array[] = {
 	{RTE_IPV4(198, 18, 0, 0), 24, 0},
 	{RTE_IPV4(198, 18, 1, 0), 24, 1},
@@ -54,16 +57,19 @@ static const struct ipv4_l3fwd_lpm_route ipv4_l3fwd_lpm_route_array[] = {
 	{RTE_IPV4(198, 18, 7, 0), 24, 7},
 };
 
-/* 2001:0200::/48 is IANA reserved range for IPv6 benchmarking (RFC5180) */
+/*
+ * 2001:200::/48 is IANA reserved range for IPv6 benchmarking (RFC5180).
+ * 2001:200:0:{0-7}::/64 = Port {0-7}
+ */
 static const struct ipv6_l3fwd_lpm_route ipv6_l3fwd_lpm_route_array[] = {
-	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 48, 0},
-	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, 48, 1},
-	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0}, 48, 2},
-	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0}, 48, 3},
-	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0}, 48, 4},
-	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0}, 48, 5},
-	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0}, 48, 6},
-	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0}, 48, 7},
+	{{32, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 64, 0},
+	{{32, 1, 2, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 64, 1},
+	{{32, 1, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0}, 64, 2},
+	{{32, 1, 2, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0}, 64, 3},
+	{{32, 1, 2, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0}, 64, 4},
+	{{32, 1, 2, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0}, 64, 5},
+	{{32, 1, 2, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0}, 64, 6},
+	{{32, 1, 2, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0}, 64, 7},
 };
 
 #define IPV4_L3FWD_LPM_MAX_RULES         1024
-- 
2.25.1