On Thu, Oct 14, 2021 at 10:42 AM Gregory Etelson <getel...@nvidia.com> wrote:
>
> 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 <getel...@nvidia.com>
> Acked-by: Olivier Matz <olivier.m...@6wind.com>
> Acked-by: Ray Kinsella <m...@ashroe.eu>
Acked-by: Ajit Khaparde <ajit.khapa...@broadcom.com>
> ---
> v2: Add dependency.
> v3: Add comments.
> v4: Update release notes.
> v5: Remove deprecation notice.
> Update the patch comment.
> v6: split the patch into 2 parts:
> 1: update the announce.
> 2: implement the IPv4 header changes.
> v7: Remove `#else`.
> ---
> app/test/test_flow_classify.c | 8 ++++----
> doc/guides/rel_notes/deprecation.rst | 3 ---
> doc/guides/rel_notes/release_21_11.rst | 3 +++
> lib/net/rte_ip.h | 14 +++++++++++++-
> 4 files changed, 20 insertions(+), 8 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/doc/guides/rel_notes/deprecation.rst
> b/doc/guides/rel_notes/deprecation.rst
> index 841653fe30..d1f3faac39 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -158,9 +158,6 @@ Deprecation Notices
> consistent with existing outer header checksum status flag naming, which
> should help in reducing confusion about its usage.
>
> -* net: The structure ``rte_ipv4_hdr`` will have a union for
> - existing ``version_ihl`` byte and new bitfield for ``version`` and ``ihl``.
> -
> * vhost: ``rte_vdpa_register_device``, ``rte_vdpa_unregister_device``,
> ``rte_vhost_host_notifier_ctrl`` and ``rte_vdpa_relay_vring_used`` vDPA
> driver interface will be marked as internal in DPDK v21.11.
> diff --git a/doc/guides/rel_notes/release_21_11.rst
> b/doc/guides/rel_notes/release_21_11.rst
> index e1726774ba..fa60fd9a85 100644
> --- a/doc/guides/rel_notes/release_21_11.rst
> +++ b/doc/guides/rel_notes/release_21_11.rst
> @@ -216,6 +216,9 @@ API Changes
> the crypto/security operation. This field will be used to communicate
> events such as soft expiry with IPsec in lookaside mode.
>
> +* net: Add ``version`` and ``ihl`` bit-fields to ``struct rte_ipv4_hdr``.
> + Existing ``version_ihl`` field was kept for backward compatibility.
> +
>
> ABI Changes
> -----------
> diff --git a/lib/net/rte_ip.h b/lib/net/rte_ip.h
> index b3d45e85db..0ef2430607 100644
> --- a/lib/net/rte_ip.h
> +++ b/lib/net/rte_ip.h
> @@ -39,7 +39,19 @@ 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; /**< header length */
> + uint8_t version:4; /**< version */
> +#elif RTE_BYTE_ORDER == RTE_BIG_ENDIAN
> + uint8_t version:4; /**< version */
> + uint8_t ihl:4; /**< header length */
> +#endif
> + };
> + };
> uint8_t type_of_service; /**< type of service */
> rte_be16_t total_length; /**< length of packet */
> rte_be16_t packet_id; /**< packet ID */
> --
> 2.33.0
>
