[dpdk-dev] [PATCH v5 5/7] examples/ipsec-secgw: define initial ESN value

[Radu Nicolau <radu.nicolau@intel.com>]

New option added to the SA configuration arguments that
allows setting an arbitrary start value for ESN.

For example in the SA below ESN will be enabled and first egress
IPsec packet will have the ESN value 10000:

sa out 15 cipher_algo null auth_algo null mode ipv4-tunnel \
src 172.16.1.5 dst 172.16.2.5 \
esn 10000

Signed-off-by: Declan Doherty <declan.doherty@intel.com>
Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
---
 doc/guides/sample_app_ug/ipsec_secgw.rst | 10 ++++++++++
 examples/ipsec-secgw/ipsec.c             |  6 ++++++
 examples/ipsec-secgw/ipsec.h             |  1 +
 examples/ipsec-secgw/sa.c                | 10 ++++++++++
 4 files changed, 27 insertions(+)

diff --git a/doc/guides/sample_app_ug/ipsec_secgw.rst b/doc/guides/sample_app_ug/ipsec_secgw.rst
index b0256da1d8..02846ac160 100644
--- a/doc/guides/sample_app_ug/ipsec_secgw.rst
+++ b/doc/guides/sample_app_ug/ipsec_secgw.rst
@@ -737,6 +737,16 @@ where each options means:
 
    * *telemetry*
 
+ ``<esn>``
+
+ * Enable ESN and set the initial ESN value.
+
+ * Optional: Yes, ESN not enabled by default
+
+ * Syntax:
+
+   * *esn N* N is the initial ESN value
+
 Example SA rules:
 
 .. code-block:: console
diff --git a/examples/ipsec-secgw/ipsec.c b/examples/ipsec-secgw/ipsec.c
index 90d9e61e5b..2d4a26c962 100644
--- a/examples/ipsec-secgw/ipsec.c
+++ b/examples/ipsec-secgw/ipsec.c
@@ -227,6 +227,12 @@ create_inline_session(struct socket_ctx *skt_ctx, struct ipsec_sa *sa,
 		sess_conf.ipsec.udp.dport = htons(sa->udp.dport);
 	}
 
+	if (sa->esn > 0) {
+		sess_conf.ipsec.options.esn = 1;
+		sess_conf.ipsec.esn.value = sa->esn;
+	}
+
+
 	RTE_LOG_DP(DEBUG, IPSEC, "Create session for SA spi %u on port %u\n",
 		sa->spi, sa->portid);
 
diff --git a/examples/ipsec-secgw/ipsec.h b/examples/ipsec-secgw/ipsec.h
index de4e0606e2..b037d5179f 100644
--- a/examples/ipsec-secgw/ipsec.h
+++ b/examples/ipsec-secgw/ipsec.h
@@ -143,6 +143,7 @@ struct ipsec_sa {
 	enum rte_security_ipsec_sa_direction direction;
 	uint8_t udp_encap;
 	uint16_t portid;
+	uint64_t esn;
 	uint8_t fdir_qid;
 	uint8_t fdir_flag;
 
diff --git a/examples/ipsec-secgw/sa.c b/examples/ipsec-secgw/sa.c
index 65c975993d..8725001fc7 100644
--- a/examples/ipsec-secgw/sa.c
+++ b/examples/ipsec-secgw/sa.c
@@ -684,6 +684,16 @@ parse_sa_tokens(char **tokens, uint32_t n_tokens,
 			continue;
 		}
 
+		if (strcmp(tokens[ti], "esn") == 0) {
+			INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
+			if (status->status < 0)
+				return;
+			rule->esn = atoll(tokens[ti]);
+			if (status->status < 0)
+				return;
+			continue;
+		}
+
 		if (strcmp(tokens[ti], "fallback") == 0) {
 			struct rte_ipsec_session *fb;
 
-- 
2.25.1