[dpdk-dev] [PATCH] net: introduce IPv4 ihl and version fields

[Gregory Etelson <getelson@nvidia.com>]

RTE IPv4 header definition combines the `version' and `ihl'  fields
into a single structure member.
This patch introduces dedicated structure members for both `version'
and `ihl' IPv4 fields. Separated header fields definitions allow to
create simplified code to match on the IHL value in a flow rule.
The original `version_ihl' structure member is kept for backward
compatibility.

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
---
 app/test/test_flow_classify.c |  8 ++++----
 lib/net/rte_ip.h              | 16 +++++++++++++++-
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/app/test/test_flow_classify.c b/app/test/test_flow_classify.c
index 951606f248..4f64be5357 100644
--- a/app/test/test_flow_classify.c
+++ b/app/test/test_flow_classify.c
@@ -95,7 +95,7 @@ static struct rte_acl_field_def ipv4_defs[NUM_FIELDS_IPV4] = {
  *  dst mask 255.255.255.00 / udp src is 32 dst is 33 / end"
  */
 static struct rte_flow_item_ipv4 ipv4_udp_spec_1 = {
-	{ 0, 0, 0, 0, 0, 0, IPPROTO_UDP, 0,
+	{ { .version_ihl = 0}, 0, 0, 0, 0, 0, IPPROTO_UDP, 0,
 	  RTE_IPV4(2, 2, 2, 3), RTE_IPV4(2, 2, 2, 7)}
 };
 static const struct rte_flow_item_ipv4 ipv4_mask_24 = {
@@ -131,7 +131,7 @@ static struct rte_flow_item  end_item = { RTE_FLOW_ITEM_TYPE_END,
  *  dst mask 255.255.255.00 / tcp src is 16 dst is 17 / end"
  */
 static struct rte_flow_item_ipv4 ipv4_tcp_spec_1 = {
-	{ 0, 0, 0, 0, 0, 0, IPPROTO_TCP, 0,
+	{ { .version_ihl = 0}, 0, 0, 0, 0, 0, IPPROTO_TCP, 0,
 	  RTE_IPV4(1, 2, 3, 4), RTE_IPV4(5, 6, 7, 8)}
 };
 
@@ -150,8 +150,8 @@ static struct rte_flow_item  tcp_item_1 = { RTE_FLOW_ITEM_TYPE_TCP,
  *  dst mask 255.255.255.00 / sctp src is 16 dst is 17/ end"
  */
 static struct rte_flow_item_ipv4 ipv4_sctp_spec_1 = {
-	{ 0, 0, 0, 0, 0, 0, IPPROTO_SCTP, 0, RTE_IPV4(11, 12, 13, 14),
-	RTE_IPV4(15, 16, 17, 18)}
+	{ { .version_ihl = 0}, 0, 0, 0, 0, 0, IPPROTO_SCTP, 0,
+	RTE_IPV4(11, 12, 13, 14), RTE_IPV4(15, 16, 17, 18)}
 };
 
 static struct rte_flow_item_sctp sctp_spec_1 = {
diff --git a/lib/net/rte_ip.h b/lib/net/rte_ip.h
index 4b728969c1..684bb028b2 100644
--- a/lib/net/rte_ip.h
+++ b/lib/net/rte_ip.h
@@ -38,7 +38,21 @@ extern "C" {
  * IPv4 Header
  */
 struct rte_ipv4_hdr {
-	uint8_t  version_ihl;		/**< version and header length */
+	__extension__
+	union {
+		uint8_t version_ihl;    /**< version and header length */
+		struct {
+#if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
+			uint8_t ihl:4;
+			uint8_t version:4;
+#elif RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+			uint8_t version:4;
+			uint8_t ihl:4;
+#else
+#error "setup endian definition"
+#endif
+		};
+	};
 	uint8_t  type_of_service;	/**< type of service */
 	rte_be16_t total_length;	/**< length of packet */
 	rte_be16_t packet_id;		/**< packet ID */
-- 
2.31.1