Add example for swapping the two halves of the IPv6 source address.
Signed-off-by: Cristian Dumitrescu <cristian.dumitre...@intel.com>
---
examples/pipeline/examples/ipv6_addr_swap.cli | 35 ++++++++
.../pipeline/examples/ipv6_addr_swap.spec | 83 +++++++++++++++++++
2 files changed, 118 insertions(+)
create mode 100644 examples/pipeline/examples/ipv6_addr_swap.cli
create mode 100644 examples/pipeline/examples/ipv6_addr_swap.spec
diff --git a/examples/pipeline/examples/ipv6_addr_swap.cli
b/examples/pipeline/examples/ipv6_addr_swap.cli
new file mode 100644
index 0000000000..a8c9c77e00
--- /dev/null
+++ b/examples/pipeline/examples/ipv6_addr_swap.cli
@@ -0,0 +1,35 @@
+; SPDX-License-Identifier: BSD-3-Clause
+; Copyright(c) 2022 Intel Corporation
+
+# Example command line:
+# ./build/examples/dpdk-pipeline -l0-1 -- -s
./examples/pipeline/examples/ipv6_addr_swap.cli
+#
+# Once the application has started, the command to get the CLI prompt is:
+# telnet 0.0.0.0 8086
+
+;
+; Pipeline code generation & shared object library build.
+;
+pipeline codegen ./examples/pipeline/examples/ipv6_addr_swap.spec
/tmp/ipv6_addr_swap.c
+pipeline libbuild /tmp/ipv6_addr_swap.c /tmp/ipv6_addr_swap.so
+
+;
+; List of DPDK devices.
+;
+; Note: Customize the parameters below to match your setup.
+;
+mempool MEMPOOL0 meta 0 pkt 2176 pool 32K cache 256 numa 0
+ethdev 0000:18:00.0 rxq 1 128 MEMPOOL0 txq 1 512 promiscuous on
+ethdev 0000:18:00.1 rxq 1 128 MEMPOOL0 txq 1 512 promiscuous on
+ethdev 0000:3b:00.0 rxq 1 128 MEMPOOL0 txq 1 512 promiscuous on
+ethdev 0000:3b:00.1 rxq 1 128 MEMPOOL0 txq 1 512 promiscuous on
+
+;
+; List of pipelines.
+;
+pipeline PIPELINE0 build lib /tmp/ipv6_addr_swap.so io
./examples/pipeline/examples/ethdev.io numa 0
+
+;
+; Pipelines-to-threads mapping.
+;
+pipeline PIPELINE0 enable thread 1
diff --git a/examples/pipeline/examples/ipv6_addr_swap.spec
b/examples/pipeline/examples/ipv6_addr_swap.spec
new file mode 100644
index 0000000000..42f8216463
--- /dev/null
+++ b/examples/pipeline/examples/ipv6_addr_swap.spec
@@ -0,0 +1,83 @@
+; SPDX-License-Identifier: BSD-3-Clause
+; Copyright(c) 2022 Intel Corporation
+
+; This simple example swaps the two halves of the IPv6 source address.
+;
+; It demonstrates how to operate with 128-bit fields (used to represent IPv6
addresses) by using
+; 64-bit operations.
+;
+; Notes:
+;
+; 1. The 128-bit fields are always stored in network byte order (NBO), even
when these fields are
+; meta-data fields, so the instructions like "mov" or "movh" that accept a
128-bit operand and
+; a 64-bit (or lesser size) operand require the latter to be also stored in
NBO, i.e. it must
+; be a header field. Hence, the 64-bit upper_half and lower_half fields
below are stored in a
+; header, and not in meta-data.
+;
+; 2. To write a IPv6 address, the lower half (bits 63-0) must be written first
using the mov
+; instruction, as it also fills the upper half (bits 127-64) with zeros,
and then the upper
+; half must me written using the movh instruction, as the movh instruction
does not change the
+; lower half.
+
+//
+// Headers.
+//
+struct ethernet_h {
+ bit<48> dst_addr
+ bit<48> src_addr
+ bit<16> ethertype
+}
+
+struct ipv6_h {
+ bit<32> version_traffic_class_flow_label
+ bit<16> payload_length
+ bit<8> next_header
+ bit<8> hop_limit
+ bit<128> src_addr
+ bit<128> dst_addr
+}
+
+struct sandbox_h {
+ bit<64> upper_half
+ bit<64> lower_half
+}
+
+header ethernet instanceof ethernet_h
+header ipv6 instanceof ipv6_h
+header tmp instanceof sandbox_h
+
+//
+// Meta-data.
+//
+struct metadata_t {
+ bit<32> port
+}
+
+metadata instanceof metadata_t
+
+//
+// Pipeline.
+//
+apply {
+ //
+ // RX and parse.
+ //
+ rx m.port
+ extract h.ethernet
+ extract h.ipv6
+
+ //
+ // Swap the two halves of the IPv6 source address.
+ //
+ movh h.tmp.upper_half h.ipv6.src_addr
+ mov h.tmp.lower_half h.ipv6.src_addr
+ mov h.ipv6.src_addr h.tmp.upper_half
+ movh h.ipv6.src_addr h.tmp.lower_half
+
+ //
+ // De-parse and TX.
+ //
+ emit h.ethernet
+ emit h.ipv6
+ tx m.port
+}
--
2.34.1
