Re: [dpdk-dev] [PATCH v2 2/2] examples/ipsec-secgw: add support for TSO

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> 
> Add support to allow user to specific MSS for TSO offload on a per SA
> basis. MSS configuration in the context of IPsec is only supported for
> outbound SA's in the context of an inline IPsec Crypto offload.


If this feature is enabled (by mss config file option),  shouldn't we check and request 
RTE_ETH_TX_OFFLOAD_UDP_TSO and RTE_ETH_TX_OFFLOAD_TCP_TSO?
As it is done for other TX offloads.
 
> Signed-off-by: Declan Doherty <declan.doherty@intel.com>
> Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
> ---
>  doc/guides/rel_notes/release_21_11.rst   |  4 ++++
>  doc/guides/sample_app_ug/ipsec_secgw.rst | 11 +++++++++++
>  examples/ipsec-secgw/ipsec-secgw.c       |  4 ++++
>  examples/ipsec-secgw/ipsec.h             |  1 +
>  examples/ipsec-secgw/ipsec_process.c     | 25 ++++++++++++++++++++++++
>  examples/ipsec-secgw/sa.c                | 10 ++++++++++
>  6 files changed, 55 insertions(+)
> 
> diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
> index b5b5abadee..8d1767b084 100644
> --- a/doc/guides/rel_notes/release_21_11.rst
> +++ b/doc/guides/rel_notes/release_21_11.rst
> @@ -306,6 +306,10 @@ New Features
>      * Pcapng format with timestamps and meta-data.
>      * Fixes packet capture with stripped VLAN tags.
> 
> +* **IPsec Security Gateway sample application new features.**
> +
> +  * Added support for TSO
> +
> 
>  Removed Items
>  -------------
> diff --git a/doc/guides/sample_app_ug/ipsec_secgw.rst b/doc/guides/sample_app_ug/ipsec_secgw.rst
> index 782574dd39..639d309a6e 100644
> --- a/doc/guides/sample_app_ug/ipsec_secgw.rst
> +++ b/doc/guides/sample_app_ug/ipsec_secgw.rst
> @@ -720,6 +720,17 @@ where each options means:
> 
>     * *udp-encap*
> 
> + ``<mss>``
> +
> + * Maximum segment size for TSO offload, available for egress SAs only.
> +
> + * Optional: Yes, TSO offload not set by default
> +
> + * Syntax:
> +
> +   * *mss N* N is the segment size in bytes
> +
> +
>  Example SA rules:
> 
>  .. code-block:: console
> diff --git a/examples/ipsec-secgw/ipsec-secgw.c b/examples/ipsec-secgw/ipsec-secgw.c
> index 4bdf99b62b..5fcf424efe 100644
> --- a/examples/ipsec-secgw/ipsec-secgw.c
> +++ b/examples/ipsec-secgw/ipsec-secgw.c
> @@ -398,6 +398,10 @@ prepare_one_packet(struct rte_mbuf *pkt, struct ipsec_traffic *t)
>  		pkt->l2_len = 0;
>  		pkt->l3_len = sizeof(*iph4);
>  		pkt->packet_type |= RTE_PTYPE_L3_IPV4;
> +		if  (pkt->packet_type & RTE_PTYPE_L4_TCP)
> +			pkt->l4_len = sizeof(struct rte_tcp_hdr);
> +		else if (pkt->packet_type & RTE_PTYPE_L4_UDP)
> +			pkt->l4_len = sizeof(struct rte_udp_hdr);
>  	} else if (eth->ether_type == rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV6)) {
>  		int next_proto;
>  		size_t l3len, ext_len;
> diff --git a/examples/ipsec-secgw/ipsec.h b/examples/ipsec-secgw/ipsec.h
> index 8405c48171..2c3640833d 100644
> --- a/examples/ipsec-secgw/ipsec.h
> +++ b/examples/ipsec-secgw/ipsec.h
> @@ -137,6 +137,7 @@ struct ipsec_sa {
>  	enum rte_security_ipsec_sa_direction direction;
>  	uint8_t udp_encap;
>  	uint16_t portid;
> +	uint16_t mss;
>  	uint8_t fdir_qid;
>  	uint8_t fdir_flag;
> 
> diff --git a/examples/ipsec-secgw/ipsec_process.c b/examples/ipsec-secgw/ipsec_process.c
> index 5012e1a6a4..26c6c2fe84 100644
> --- a/examples/ipsec-secgw/ipsec_process.c
> +++ b/examples/ipsec-secgw/ipsec_process.c
> @@ -222,6 +222,31 @@ prep_process_group(void *sa, struct rte_mbuf *mb[], uint32_t cnt)
>  	for (j = 0; j != cnt; j++) {
>  		priv = get_priv(mb[j]);
>  		priv->sa = sa;
> +		/* setup TSO related fields if TSO enabled*/
> +		if (priv->sa->mss) {
> +			mb[j]->tso_segsz = priv->sa->mss;
> +
> +			if ((IS_TUNNEL(priv->sa->flags))) {
> +				mb[j]->outer_l3_len = mb[j]->l3_len;
> +				mb[j]->outer_l2_len = mb[j]->l2_len;
> +				mb[j]->ol_flags |=
> +				(RTE_MBUF_F_TX_OUTER_IP_CKSUM |
> +						RTE_MBUF_F_TX_TUNNEL_ESP);
> +			}
> +			uint32_t ptype = mb[j]->packet_type;
> +			if  (ptype & RTE_PTYPE_L4_TCP)
> +				mb[j]->ol_flags |=
> +						(RTE_MBUF_F_TX_TCP_SEG |
> +						RTE_MBUF_F_TX_TCP_CKSUM);
> +			else
> +				mb[j]->ol_flags |=
> +					(RTE_MBUF_F_TX_UDP_SEG |
> +						RTE_MBUF_F_TX_UDP_CKSUM);
> +			if (RTE_ETH_IS_IPV4_HDR(ptype))
> +				mb[j]->ol_flags |= RTE_MBUF_F_TX_OUTER_IPV4;
> +			else
> +				mb[j]->ol_flags |= RTE_MBUF_F_TX_OUTER_IPV6;
> +		}
>  	}
>  }
> 
> diff --git a/examples/ipsec-secgw/sa.c b/examples/ipsec-secgw/sa.c
> index 88dd30464f..6679e2a598 100644
> --- a/examples/ipsec-secgw/sa.c
> +++ b/examples/ipsec-secgw/sa.c
> @@ -677,6 +677,16 @@ parse_sa_tokens(char **tokens, uint32_t n_tokens,
>  			continue;
>  		}
> 
> +		if (strcmp(tokens[ti], "mss") == 0) {
> +			INCREMENT_TOKEN_INDEX(ti, n_tokens, status);
> +			if (status->status < 0)
> +				return;
> +			rule->mss = atoi(tokens[ti]);
> +			if (status->status < 0)
> +				return;
> +			continue;
> +		}
> +
>  		if (strcmp(tokens[ti], "fallback") == 0) {
>  			struct rte_ipsec_session *fb;
> 
> --
> 2.25.1