Re: [dpdk-dev] [PATCH v4 2/2] examples/ipsec-secgw: add support for TCP TSO

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

> Add support to allow user to specific MSS for TCP 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.
> 
> 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     | 22 +++++++++++++++++++++
>  examples/ipsec-secgw/sa.c                | 25 +++++++++++++++++++++---
>  6 files changed, 64 insertions(+), 3 deletions(-)
> 
> diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
> index b5b5abadee..35ececc3f2 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 (only for inline crypto TCP packets)
> +
> 
>  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..bb56e97ad7 100644
> --- a/examples/ipsec-secgw/ipsec_process.c
> +++ b/examples/ipsec-secgw/ipsec_process.c
> @@ -222,6 +222,28 @@ 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) {
> +			/* TCP only */
> +			uint32_t ptype = mb[j]->packet_type;
> +			if  (ptype & (RTE_PTYPE_L4_TCP == 0))

It should be:
if  ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP)
...

With that fixed:
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>


> +				continue;
> +
> +			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);
> +			}
> +			mb[j]->ol_flags |= (RTE_MBUF_F_TX_TCP_SEG |
> +					RTE_MBUF_F_TX_TCP_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..97f265cc7b 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;
> 
> @@ -970,7 +980,7 @@ sa_create(const char *name, int32_t socket_id, uint32_t nb_sa)
>  }
> 
>  static int
> -check_eth_dev_caps(uint16_t portid, uint32_t inbound)
> +check_eth_dev_caps(uint16_t portid, uint32_t inbound, uint32_t tso)
>  {
>  	struct rte_eth_dev_info dev_info;
>  	int retval;
> @@ -999,6 +1009,12 @@ check_eth_dev_caps(uint16_t portid, uint32_t inbound)
>  				"hardware TX IPSec offload is not supported\n");
>  			return -EINVAL;
>  		}
> +		if (tso && (dev_info.tx_offload_capa &
> +				RTE_ETH_TX_OFFLOAD_TCP_TSO) == 0) {
> +			RTE_LOG(WARNING, PORT,
> +				"hardware TCP TSO offload is not supported\n");
> +			return -EINVAL;
> +		}
>  	}
>  	return 0;
>  }
> @@ -1127,7 +1143,7 @@ sa_add_rules(struct sa_ctx *sa_ctx, const struct ipsec_sa entries[],
> 
>  		if (ips->type == RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL ||
>  			ips->type == RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO) {
> -			if (check_eth_dev_caps(sa->portid, inbound))
> +			if (check_eth_dev_caps(sa->portid, inbound, sa->mss))
>  				return -EINVAL;
>  		}
> 
> @@ -1638,8 +1654,11 @@ sa_check_offloads(uint16_t port_id, uint64_t *rx_offloads,
>  		if ((rule_type == RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO ||
>  				rule_type ==
>  				RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL)
> -				&& rule->portid == port_id)
> +				&& rule->portid == port_id) {
>  			*tx_offloads |= RTE_ETH_TX_OFFLOAD_SECURITY;
> +			if (rule->mss)
> +				*tx_offloads |= RTE_ETH_TX_OFFLOAD_TCP_TSO;
> +		}
>  	}
>  	return 0;
>  }
> --
> 2.25.1