[dpdk-dev] [PATCH 4/4] examples/pipeline: add learner table example

[Cristian Dumitrescu <cristian.dumitrescu@intel.com>]

Added the files to illustrate the learner table usage.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
---
 examples/pipeline/examples/learner.cli  |  35 ++++++++
 examples/pipeline/examples/learner.spec | 109 ++++++++++++++++++++++++
 2 files changed, 144 insertions(+)
 create mode 100644 examples/pipeline/examples/learner.cli
 create mode 100644 examples/pipeline/examples/learner.spec

diff --git a/examples/pipeline/examples/learner.cli b/examples/pipeline/examples/learner.cli
new file mode 100644
index 0000000000..732b6cb85f
--- /dev/null
+++ b/examples/pipeline/examples/learner.cli
@@ -0,0 +1,35 @@
+; SPDX-License-Identifier: BSD-3-Clause
+; Copyright(c) 2020 Intel Corporation
+
+;
+; Customize the LINK parameters to match your setup.
+;
+mempool MEMPOOL0 buffer 2304 pool 32K cache 256 cpu 0
+
+link LINK0 dev 0000:18:00.0 rxq 1 128 MEMPOOL0 txq 1 512 promiscuous on
+link LINK1 dev 0000:18:00.1 rxq 1 128 MEMPOOL0 txq 1 512 promiscuous on
+link LINK2 dev 0000:3b:00.0 rxq 1 128 MEMPOOL0 txq 1 512 promiscuous on
+link LINK3 dev 0000:3b:00.1 rxq 1 128 MEMPOOL0 txq 1 512 promiscuous on
+
+;
+; PIPELINE0 setup.
+;
+pipeline PIPELINE0 create 0
+
+pipeline PIPELINE0 port in 0 link LINK0 rxq 0 bsz 32
+pipeline PIPELINE0 port in 1 link LINK1 rxq 0 bsz 32
+pipeline PIPELINE0 port in 2 link LINK2 rxq 0 bsz 32
+pipeline PIPELINE0 port in 3 link LINK3 rxq 0 bsz 32
+
+pipeline PIPELINE0 port out 0 link LINK0 txq 0 bsz 32
+pipeline PIPELINE0 port out 1 link LINK1 txq 0 bsz 32
+pipeline PIPELINE0 port out 2 link LINK2 txq 0 bsz 32
+pipeline PIPELINE0 port out 3 link LINK3 txq 0 bsz 32
+pipeline PIPELINE0 port out 4 sink none
+
+pipeline PIPELINE0 build ./examples/pipeline/examples/learner.spec
+
+;
+; Pipelines-to-threads mapping.
+;
+thread 1 pipeline PIPELINE0 enable
diff --git a/examples/pipeline/examples/learner.spec b/examples/pipeline/examples/learner.spec
new file mode 100644
index 0000000000..0fa56295a6
--- /dev/null
+++ b/examples/pipeline/examples/learner.spec
@@ -0,0 +1,109 @@
+; SPDX-License-Identifier: BSD-3-Clause
+; Copyright(c) 2020 Intel Corporation
+
+//
+// Headers
+//
+struct ethernet_h {
+	bit<48> dst_addr
+	bit<48> src_addr
+	bit<16> ethertype
+}
+
+struct ipv4_h {
+	bit<8> ver_ihl
+	bit<8> diffserv
+	bit<16> total_len
+	bit<16> identification
+	bit<16> flags_offset
+	bit<8> ttl
+	bit<8> protocol
+	bit<16> hdr_checksum
+	bit<32> src_addr
+	bit<32> dst_addr
+}
+
+header ethernet instanceof ethernet_h
+header ipv4 instanceof ipv4_h
+
+//
+// Meta-data
+//
+struct metadata_t {
+	bit<32> port_in
+	bit<32> port_out
+
+	// Arguments for the "fwd_action" action.
+	bit<32> fwd_action_arg_port_out
+}
+
+metadata instanceof metadata_t
+
+//
+// Registers.
+//
+regarray counter size 1 initval 0
+
+//
+// Actions
+//
+struct fwd_action_args_t {
+	bit<32> port_out
+}
+
+action fwd_action args instanceof fwd_action_args_t {
+	mov m.port_out t.port_out
+	return
+}
+
+action learn_action args none {
+	// Read current counter value into m.fwd_action_arg_port_out.
+	regrd m.fwd_action_arg_port_out counter 0
+
+	// Increment the counter.
+	regadd counter 0 1
+
+	// Limit the values of m.fwd_action_arg_port_out to 0 .. 3.
+	and m.fwd_action_arg_port_out 3
+
+	// Add the current lookup key to the table. The associated action is fwd_action, with the
+	// action parameters read from the packet meta-data starting with the
+	// m.fwd_action_arg_port_out field.
+	learn fwd_action
+
+	// Send the current packet to the same output port.
+	mov m.port_out m.fwd_action_arg_port_out
+
+	return
+}
+
+//
+// Tables.
+//
+learner fwd_table {
+	key {
+		h.ipv4.dst_addr
+	}
+
+	actions {
+		fwd_action args m.fwd_action_arg_port_out
+		learn_action args none
+	}
+
+	default_action learn_action args none
+	size 1048576
+	timeout 120
+}
+
+//
+// Pipeline.
+//
+apply {
+	rx m.port_in
+	extract h.ethernet
+	extract h.ipv4
+	table fwd_table
+	emit h.ethernet
+	emit h.ipv4
+	tx m.port_out
+}
-- 
2.17.1