[dpdk-dev] [PATCH 0/2] ipsec: add transmit segmentation offload support

[dpdk-dev] [PATCH 0/2] ipsec: add transmit segmentation offload support

[Radu Nicolau]

Add transmit segmentation offload support to the IPsec library and IPsec
Security GW sample app.
These patches were split from previously sent patchsets with feedback addressed

https://patchwork.dpdk.org/project/dpdk/patch/20211013121331.300245-7-radu.nicolau@intel.com/
https://patchwork.dpdk.org/project/dpdk/patch/20211001095202.3343782-5-radu.nicolau@intel.com/


Radu Nicolau (2):
  ipsec: add transmit segmentation offload support
  examples/ipsec-secgw: add support for TSO

 doc/guides/prog_guide/ipsec_lib.rst      |   2 +
 doc/guides/rel_notes/release_21_11.rst   |   5 +
 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                |  10 ++
 lib/ipsec/esp_outb.c                     | 131 ++++++++++++++++++-----
 8 files changed, 158 insertions(+), 28 deletions(-)

-- 
2.25.1

[dpdk-dev] [PATCH 1/2] ipsec: add transmit segmentation offload support

[Radu Nicolau]

Add support for transmit segmentation offload to inline crypto processing
mode. This offload is not supported by other offload modes, as at a
minimum it requires inline crypto for IPsec to be supported on the
network interface.

Signed-off-by: Declan Doherty <declan.doherty@intel.com>
Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
Signed-off-by: Abhijit Sinha <abhijit.sinha@intel.com>
Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>
---
 doc/guides/prog_guide/ipsec_lib.rst    |   2 +
 doc/guides/rel_notes/release_21_11.rst |   1 +
 lib/ipsec/esp_outb.c                   | 131 +++++++++++++++++++------
 3 files changed, 106 insertions(+), 28 deletions(-)

diff --git a/doc/guides/prog_guide/ipsec_lib.rst b/doc/guides/prog_guide/ipsec_lib.rst
index 1bafdc608c..2a262f8c51 100644
--- a/doc/guides/prog_guide/ipsec_lib.rst
+++ b/doc/guides/prog_guide/ipsec_lib.rst
@@ -315,6 +315,8 @@ Supported features
 
 *  NAT-T / UDP encapsulated ESP.
 
+*  TSO support (only for inline crypto mode)
+
 *  algorithms: 3DES-CBC, AES-CBC, AES-CTR, AES-GCM, AES_CCM, CHACHA20_POLY1305,
    AES_GMAC, HMAC-SHA1, NULL.
 
diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
index f6d2bc6f48..955b0bd68f 100644
--- a/doc/guides/rel_notes/release_21_11.rst
+++ b/doc/guides/rel_notes/release_21_11.rst
@@ -201,6 +201,7 @@ New Features
   * Added support for NAT-T / UDP encapsulated ESP
   * Added support for SA telemetry.
   * Added support for setting a non default starting ESN value.
+  * Added support TSO offload support; only supported for inline crypto mode.
 
 
 Removed Items
diff --git a/lib/ipsec/esp_outb.c b/lib/ipsec/esp_outb.c
index b6c72f58a4..c9fba662f2 100644
--- a/lib/ipsec/esp_outb.c
+++ b/lib/ipsec/esp_outb.c
@@ -18,7 +18,7 @@
 
 typedef int32_t (*esp_outb_prepare_t)(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 	const uint64_t ivp[IPSEC_MAX_IV_QWORD], struct rte_mbuf *mb,
-	union sym_op_data *icv, uint8_t sqh_len);
+	union sym_op_data *icv, uint8_t sqh_len, uint8_t tso);
 
 /*
  * helper function to fill crypto_sym op for cipher+auth algorithms.
@@ -139,7 +139,7 @@ outb_cop_prepare(struct rte_crypto_op *cop,
 static inline int32_t
 outb_tun_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 	const uint64_t ivp[IPSEC_MAX_IV_QWORD], struct rte_mbuf *mb,
-	union sym_op_data *icv, uint8_t sqh_len)
+	union sym_op_data *icv, uint8_t sqh_len, uint8_t tso)
 {
 	uint32_t clen, hlen, l2len, pdlen, pdofs, plen, tlen;
 	struct rte_mbuf *ml;
@@ -157,11 +157,20 @@ outb_tun_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 
 	/* number of bytes to encrypt */
 	clen = plen + sizeof(*espt);
-	clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
+
+	/* We don't need to pad/align packet when using TSO offload */
+	if (!tso)
+		clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
+
 
 	/* pad length + esp tail */
 	pdlen = clen - plen;
-	tlen = pdlen + sa->icv_len + sqh_len;
+
+	/* We don't append ICV length when using TSO offload */
+	if (!tso)
+		tlen = pdlen + sa->icv_len + sqh_len;
+	else
+		tlen = pdlen + sqh_len;
 
 	/* do append and prepend */
 	ml = rte_pktmbuf_lastseg(mb);
@@ -309,7 +318,7 @@ esp_outb_tun_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
 
 		/* try to update the packet itself */
 		rc = outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv,
-					  sa->sqh_len);
+					  sa->sqh_len, 0);
 		/* success, setup crypto op */
 		if (rc >= 0) {
 			outb_pkt_xprepare(sa, sqc, &icv);
@@ -336,7 +345,7 @@ esp_outb_tun_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
 static inline int32_t
 outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 	const uint64_t ivp[IPSEC_MAX_IV_QWORD], struct rte_mbuf *mb,
-	union sym_op_data *icv, uint8_t sqh_len)
+	union sym_op_data *icv, uint8_t sqh_len, uint8_t tso)
 {
 	uint8_t np;
 	uint32_t clen, hlen, pdlen, pdofs, plen, tlen, uhlen;
@@ -358,11 +367,19 @@ outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
 
 	/* number of bytes to encrypt */
 	clen = plen + sizeof(*espt);
-	clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
+
+	/* We don't need to pad/align packet when using TSO offload */
+	if (!tso)
+		clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
 
 	/* pad length + esp tail */
 	pdlen = clen - plen;
-	tlen = pdlen + sa->icv_len + sqh_len;
+
+	/* We don't append ICV length when using TSO offload */
+	if (!tso)
+		tlen = pdlen + sa->icv_len + sqh_len;
+	else
+		tlen = pdlen + sqh_len;
 
 	/* do append and insert */
 	ml = rte_pktmbuf_lastseg(mb);
@@ -452,7 +469,7 @@ esp_outb_trs_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
 
 		/* try to update the packet itself */
 		rc = outb_trs_pkt_prepare(sa, sqc, iv, mb[i], &icv,
-				  sa->sqh_len);
+				  sa->sqh_len, 0);
 		/* success, setup crypto op */
 		if (rc >= 0) {
 			outb_pkt_xprepare(sa, sqc, &icv);
@@ -549,7 +566,7 @@ cpu_outb_pkt_prepare(const struct rte_ipsec_session *ss,
 		gen_iv(ivbuf[k], sqc);
 
 		/* try to update the packet itself */
-		rc = prepare(sa, sqc, ivbuf[k], mb[i], &icv, sa->sqh_len);
+		rc = prepare(sa, sqc, ivbuf[k], mb[i], &icv, sa->sqh_len, 0);
 
 		/* success, proceed with preparations */
 		if (rc >= 0) {
@@ -668,6 +685,20 @@ inline_outb_mbuf_prepare(const struct rte_ipsec_session *ss,
 	ss->sa->statistics.bytes += bytes;
 }
 
+
+static inline int
+esn_outb_nb_segments(struct rte_mbuf *m)
+{
+	if  (m->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_UDP_SEG)) {
+		uint16_t pkt_l3len = m->pkt_len - m->l2_len;
+		uint16_t segments =
+			(m->tso_segsz > 0 && pkt_l3len > m->tso_segsz) ?
+			(pkt_l3len + m->tso_segsz - 1) / m->tso_segsz : 1;
+		return segments;
+	}
+	return 1; /* no TSO */
+}
+
 /*
  * process group of ESP outbound tunnel packets destined for
  * INLINE_CRYPTO type of device.
@@ -677,29 +708,51 @@ inline_outb_tun_pkt_process(const struct rte_ipsec_session *ss,
 	struct rte_mbuf *mb[], uint16_t num)
 {
 	int32_t rc;
-	uint32_t i, k, n;
+	uint32_t i, k, nb_segs_t, n_sqn;
 	uint64_t sqn;
 	rte_be64_t sqc;
 	struct rte_ipsec_sa *sa;
 	union sym_op_data icv;
 	uint64_t iv[IPSEC_MAX_IV_QWORD];
 	uint32_t dr[num];
+	uint16_t nb_segs[num];
 
 	sa = ss->sa;
+	nb_segs_t = 0;
+	/* Calculate number of segments */
+	for (i = 0; i != num; i++) {
+		nb_segs[i] = esn_outb_nb_segments(mb[i]);
+		nb_segs_t += nb_segs[i];
+	}
 
-	n = num;
-	sqn = esn_outb_update_sqn(sa, &n);
-	if (n != num)
+	n_sqn = nb_segs_t;
+	sqn = esn_outb_update_sqn(sa, &n_sqn);
+	if (n_sqn != nb_segs_t) {
 		rte_errno = EOVERFLOW;
+		/* if there are segmented packets find out how many can be
+		 * sent until overflow occurs
+		 */
+		if (nb_segs_t > num) { /* there is at least 1 */
+			uint32_t seg_cnt = 0;
+			for (i = 0; i < num && seg_cnt < n_sqn; i++)
+				seg_cnt += nb_segs[i];
+			num = i - 1;
+		} else {
+			num = n_sqn; /* no segmented packets */
+		}
+	}
 
 	k = 0;
-	for (i = 0; i != n; i++) {
+	for (i = 0; i != num; i++) {
 
-		sqc = rte_cpu_to_be_64(sqn + i);
+		sqc = rte_cpu_to_be_64(sqn);
 		gen_iv(iv, sqc);
+		sqn += nb_segs[i];
 
 		/* try to update the packet itself */
-		rc = outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv, 0);
+		rc = outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv, 0,
+			(mb[i]->ol_flags &
+			(PKT_TX_TCP_SEG | PKT_TX_UDP_SEG)) != 0);
 
 		k += (rc >= 0);
 
@@ -711,8 +764,8 @@ inline_outb_tun_pkt_process(const struct rte_ipsec_session *ss,
 	}
 
 	/* copy not processed mbufs beyond good ones */
-	if (k != n && k != 0)
-		move_bad_mbufs(mb, dr, n, n - k);
+	if (k != num && k != 0)
+		move_bad_mbufs(mb, dr, num, num - k);
 
 	inline_outb_mbuf_prepare(ss, mb, k);
 	return k;
@@ -727,29 +780,51 @@ inline_outb_trs_pkt_process(const struct rte_ipsec_session *ss,
 	struct rte_mbuf *mb[], uint16_t num)
 {
 	int32_t rc;
-	uint32_t i, k, n;
+	uint32_t i, k, nb_segs_t, n_sqn;
 	uint64_t sqn;
 	rte_be64_t sqc;
 	struct rte_ipsec_sa *sa;
 	union sym_op_data icv;
 	uint64_t iv[IPSEC_MAX_IV_QWORD];
 	uint32_t dr[num];
+	uint16_t nb_segs[num];
 
 	sa = ss->sa;
+	nb_segs_t = 0;
+	/* Calculate number of segments */
+	for (i = 0; i != num; i++) {
+		nb_segs[i] = esn_outb_nb_segments(mb[i]);
+		nb_segs_t += nb_segs[i];
+	}
 
-	n = num;
-	sqn = esn_outb_update_sqn(sa, &n);
-	if (n != num)
+	n_sqn = nb_segs_t;
+	sqn = esn_outb_update_sqn(sa, &n_sqn);
+	if (n_sqn != nb_segs_t) {
 		rte_errno = EOVERFLOW;
+		/* if there are segmented packets find out how many can be
+		 * sent until overflow occurs
+		 */
+		if (nb_segs_t > num) { /* there is at least 1 */
+			uint32_t seg_cnt = 0;
+			for (i = 0; i < num && seg_cnt < n_sqn; i++)
+				seg_cnt += nb_segs[i];
+			num = i - 1;
+		} else {
+			num = n_sqn; /* no segmented packets */
+		}
+	}
 
 	k = 0;
-	for (i = 0; i != n; i++) {
+	for (i = 0; i != num; i++) {
 
-		sqc = rte_cpu_to_be_64(sqn + i);
+		sqc = rte_cpu_to_be_64(sqn);
 		gen_iv(iv, sqc);
+		sqn += nb_segs[i];
 
 		/* try to update the packet itself */
-		rc = outb_trs_pkt_prepare(sa, sqc, iv, mb[i], &icv, 0);
+		rc = outb_trs_pkt_prepare(sa, sqc, iv, mb[i], &icv, 0,
+				(mb[i]->ol_flags &
+				(PKT_TX_TCP_SEG | PKT_TX_UDP_SEG)) != 0);
 
 		k += (rc >= 0);
 
@@ -761,8 +836,8 @@ inline_outb_trs_pkt_process(const struct rte_ipsec_session *ss,
 	}
 
 	/* copy not processed mbufs beyond good ones */
-	if (k != n && k != 0)
-		move_bad_mbufs(mb, dr, n, n - k);
+	if (k != num && k != 0)
+		move_bad_mbufs(mb, dr, num, num - k);
 
 	inline_outb_mbuf_prepare(ss, mb, k);
 	return k;
-- 
2.25.1

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

[Radu Nicolau]

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.

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                | 10 ++++++++++
 6 files changed, 52 insertions(+)

diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
index 955b0bd68f..c2563c6f63 100644
--- a/doc/guides/rel_notes/release_21_11.rst
+++ b/doc/guides/rel_notes/release_21_11.rst
@@ -203,6 +203,10 @@ New Features
   * Added support for setting a non default starting ESN value.
   * Added support TSO offload support; only supported for inline crypto mode.
 
+* **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 6510456e31..2ff928e4dc 100644
--- a/doc/guides/sample_app_ug/ipsec_secgw.rst
+++ b/doc/guides/sample_app_ug/ipsec_secgw.rst
@@ -748,6 +748,17 @@ where each options means:
 
    * *esn N* N is the initial ESN value
 
+ ``<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 47c33661df..6aaaaa3a14 100644
--- a/examples/ipsec-secgw/ipsec-secgw.c
+++ b/examples/ipsec-secgw/ipsec-secgw.c
@@ -400,6 +400,10 @@ 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 0dfb0d6acb..02855ce774 100644
--- a/examples/ipsec-secgw/ipsec.h
+++ b/examples/ipsec-secgw/ipsec.h
@@ -142,6 +142,7 @@ struct ipsec_sa {
 	enum rte_security_ipsec_sa_direction direction;
 	uint8_t udp_encap;
 	uint16_t portid;
+	uint16_t mss;
 	uint64_t esn;
 	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..333e3f1e74 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) {
+			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 |=
+				(PKT_TX_OUTER_IP_CKSUM | PKT_TX_TUNNEL_ESP);
+			}
+			uint32_t ptype = mb[j]->packet_type;
+			if  (ptype & RTE_PTYPE_L4_TCP)
+				mb[j]->ol_flags |=
+					(PKT_TX_TCP_SEG | PKT_TX_TCP_CKSUM);
+			else
+				mb[j]->ol_flags |=
+					(PKT_TX_UDP_SEG | PKT_TX_UDP_CKSUM);
+			if (RTE_ETH_IS_IPV4_HDR(ptype))
+				mb[j]->ol_flags |= PKT_TX_OUTER_IPV4;
+			else
+				mb[j]->ol_flags |= PKT_TX_OUTER_IPV6;
+		}
 	}
 }
 
diff --git a/examples/ipsec-secgw/sa.c b/examples/ipsec-secgw/sa.c
index de06f24d01..3690e0a7eb 100644
--- a/examples/ipsec-secgw/sa.c
+++ b/examples/ipsec-secgw/sa.c
@@ -778,6 +778,16 @@ 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

Re: [dpdk-dev] [EXT] [PATCH 1/2] ipsec: add transmit segmentation offload support

[Akhil Goyal]

> Subject: [EXT] [PATCH 1/2] ipsec: add transmit segmentation offload support
> 
Title should be ipsec: support TSO

> Add support for transmit segmentation offload to inline crypto processing
> mode. This offload is not supported by other offload modes, as at a
> minimum it requires inline crypto for IPsec to be supported on the
> network interface.
> 
> Signed-off-by: Declan Doherty <declan.doherty@intel.com>
> Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
> Signed-off-by: Abhijit Sinha <abhijit.sinha@intel.com>
> Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
> Acked-by: Fan Zhang <roy.fan.zhang@intel.com>
> ---
>  doc/guides/prog_guide/ipsec_lib.rst    |   2 +
>  doc/guides/rel_notes/release_21_11.rst |   1 +
>  lib/ipsec/esp_outb.c                   | 131 +++++++++++++++++++------
>  3 files changed, 106 insertions(+), 28 deletions(-)
> 
> diff --git a/doc/guides/prog_guide/ipsec_lib.rst
> b/doc/guides/prog_guide/ipsec_lib.rst
> index 1bafdc608c..2a262f8c51 100644
> --- a/doc/guides/prog_guide/ipsec_lib.rst
> +++ b/doc/guides/prog_guide/ipsec_lib.rst
> @@ -315,6 +315,8 @@ Supported features
> 
>  *  NAT-T / UDP encapsulated ESP.
> 
> +*  TSO support (only for inline crypto mode)
> +
The word support can be dropped here as it is a list of supported features.

>  *  algorithms: 3DES-CBC, AES-CBC, AES-CTR, AES-GCM, AES_CCM,
> CHACHA20_POLY1305,
>     AES_GMAC, HMAC-SHA1, NULL.
> 
> diff --git a/doc/guides/rel_notes/release_21_11.rst
> b/doc/guides/rel_notes/release_21_11.rst
> index f6d2bc6f48..955b0bd68f 100644
> --- a/doc/guides/rel_notes/release_21_11.rst
> +++ b/doc/guides/rel_notes/release_21_11.rst
> @@ -201,6 +201,7 @@ New Features
>    * Added support for NAT-T / UDP encapsulated ESP
>    * Added support for SA telemetry.
>    * Added support for setting a non default starting ESN value.
> +  * Added support TSO offload support; only supported for inline crypto
> mode.

The word support is added three times in a single sentence.
It can be rephrased as
* Added support for TSO in inline crypto mode.


> 
> 
>  Removed Items
> diff --git a/lib/ipsec/esp_outb.c b/lib/ipsec/esp_outb.c
> index b6c72f58a4..c9fba662f2 100644
> --- a/lib/ipsec/esp_outb.c
> +++ b/lib/ipsec/esp_outb.c
> @@ -18,7 +18,7 @@
> 
>  typedef int32_t (*esp_outb_prepare_t)(struct rte_ipsec_sa *sa, rte_be64_t
> sqc,
>  	const uint64_t ivp[IPSEC_MAX_IV_QWORD], struct rte_mbuf *mb,
> -	union sym_op_data *icv, uint8_t sqh_len);
> +	union sym_op_data *icv, uint8_t sqh_len, uint8_t tso);
> 
>  /*
>   * helper function to fill crypto_sym op for cipher+auth algorithms.
> @@ -139,7 +139,7 @@ outb_cop_prepare(struct rte_crypto_op *cop,
>  static inline int32_t
>  outb_tun_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
>  	const uint64_t ivp[IPSEC_MAX_IV_QWORD], struct rte_mbuf *mb,
> -	union sym_op_data *icv, uint8_t sqh_len)
> +	union sym_op_data *icv, uint8_t sqh_len, uint8_t tso)
>  {
>  	uint32_t clen, hlen, l2len, pdlen, pdofs, plen, tlen;
>  	struct rte_mbuf *ml;
> @@ -157,11 +157,20 @@ outb_tun_pkt_prepare(struct rte_ipsec_sa *sa,
> rte_be64_t sqc,
> 
>  	/* number of bytes to encrypt */
>  	clen = plen + sizeof(*espt);
> -	clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
> +
> +	/* We don't need to pad/align packet when using TSO offload */
> +	if (!tso)
> +		clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
> +
> 
>  	/* pad length + esp tail */
>  	pdlen = clen - plen;
> -	tlen = pdlen + sa->icv_len + sqh_len;
> +
> +	/* We don't append ICV length when using TSO offload */
> +	if (!tso)
> +		tlen = pdlen + sa->icv_len + sqh_len;
> +	else
> +		tlen = pdlen + sqh_len;
This is a data path function, 2 extra checks are added for tso in the same function
if (tso) {
	pdlen = clen - plen;
	tlen = pdlen + sqh_len;
} else {
	clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
	pdlen = clen - plen;
	tlen = pdlen + sa->icv_len + sqh_len;
}


> 
>  	/* do append and prepend */
>  	ml = rte_pktmbuf_lastseg(mb);
> @@ -309,7 +318,7 @@ esp_outb_tun_prepare(const struct
> rte_ipsec_session *ss, struct rte_mbuf *mb[],
> 
>  		/* try to update the packet itself */
>  		rc = outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv,
> -					  sa->sqh_len);
> +					  sa->sqh_len, 0);
>  		/* success, setup crypto op */
>  		if (rc >= 0) {
>  			outb_pkt_xprepare(sa, sqc, &icv);
> @@ -336,7 +345,7 @@ esp_outb_tun_prepare(const struct
> rte_ipsec_session *ss, struct rte_mbuf *mb[],
>  static inline int32_t
>  outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
>  	const uint64_t ivp[IPSEC_MAX_IV_QWORD], struct rte_mbuf *mb,
> -	union sym_op_data *icv, uint8_t sqh_len)
> +	union sym_op_data *icv, uint8_t sqh_len, uint8_t tso)
>  {
>  	uint8_t np;
>  	uint32_t clen, hlen, pdlen, pdofs, plen, tlen, uhlen;
> @@ -358,11 +367,19 @@ outb_trs_pkt_prepare(struct rte_ipsec_sa *sa,
> rte_be64_t sqc,
> 
>  	/* number of bytes to encrypt */
>  	clen = plen + sizeof(*espt);
> -	clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
> +
> +	/* We don't need to pad/align packet when using TSO offload */
> +	if (!tso)
> +		clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
> 
>  	/* pad length + esp tail */
>  	pdlen = clen - plen;
> -	tlen = pdlen + sa->icv_len + sqh_len;
> +
> +	/* We don't append ICV length when using TSO offload */
> +	if (!tso)
> +		tlen = pdlen + sa->icv_len + sqh_len;
> +	else
> +		tlen = pdlen + sqh_len;

Same comment as above.

> 
>  	/* do append and insert */
>  	ml = rte_pktmbuf_lastseg(mb);
> @@ -452,7 +469,7 @@ esp_outb_trs_prepare(const struct rte_ipsec_session
> *ss, struct rte_mbuf *mb[],
> 
>  		/* try to update the packet itself */
>  		rc = outb_trs_pkt_prepare(sa, sqc, iv, mb[i], &icv,
> -				  sa->sqh_len);
> +				  sa->sqh_len, 0);
>  		/* success, setup crypto op */
>  		if (rc >= 0) {
>  			outb_pkt_xprepare(sa, sqc, &icv);
> @@ -549,7 +566,7 @@ cpu_outb_pkt_prepare(const struct
> rte_ipsec_session *ss,
>  		gen_iv(ivbuf[k], sqc);
> 
>  		/* try to update the packet itself */
> -		rc = prepare(sa, sqc, ivbuf[k], mb[i], &icv, sa->sqh_len);
> +		rc = prepare(sa, sqc, ivbuf[k], mb[i], &icv, sa->sqh_len, 0);
> 
>  		/* success, proceed with preparations */
>  		if (rc >= 0) {
> @@ -668,6 +685,20 @@ inline_outb_mbuf_prepare(const struct
> rte_ipsec_session *ss,
>  	ss->sa->statistics.bytes += bytes;
>  }
> 
> +
> +static inline int
> +esn_outb_nb_segments(struct rte_mbuf *m)
> +{
> +	if  (m->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_UDP_SEG)) {
> +		uint16_t pkt_l3len = m->pkt_len - m->l2_len;
> +		uint16_t segments =
> +			(m->tso_segsz > 0 && pkt_l3len > m->tso_segsz) ?
> +			(pkt_l3len + m->tso_segsz - 1) / m->tso_segsz : 1;
> +		return segments;

Directly return, no need for defining segments.

> +	}
> +	return 1; /* no TSO */
> +}
> +
>  /*
>   * process group of ESP outbound tunnel packets destined for
>   * INLINE_CRYPTO type of device.
> @@ -677,29 +708,51 @@ inline_outb_tun_pkt_process(const struct
> rte_ipsec_session *ss,
>  	struct rte_mbuf *mb[], uint16_t num)
>  {
>  	int32_t rc;
> -	uint32_t i, k, n;
> +	uint32_t i, k, nb_segs_t, n_sqn;

_t is normally used for typedefs. Can we rename it?

>  	uint64_t sqn;
>  	rte_be64_t sqc;
>  	struct rte_ipsec_sa *sa;
>  	union sym_op_data icv;
>  	uint64_t iv[IPSEC_MAX_IV_QWORD];
>  	uint32_t dr[num];
> +	uint16_t nb_segs[num];
> 
>  	sa = ss->sa;
> +	nb_segs_t = 0;
> +	/* Calculate number of segments */
> +	for (i = 0; i != num; i++) {
> +		nb_segs[i] = esn_outb_nb_segments(mb[i]);
> +		nb_segs_t += nb_segs[i];
> +	}
> 
> -	n = num;
> -	sqn = esn_outb_update_sqn(sa, &n);
> -	if (n != num)
> +	n_sqn = nb_segs_t;
> +	sqn = esn_outb_update_sqn(sa, &n_sqn);
> +	if (n_sqn != nb_segs_t) {
>  		rte_errno = EOVERFLOW;

If it is an error condition, shouldn't we return.
Also, I do not see rte_errno being checked anywhere in the app/test or ipsec-secgw.

> +		/* if there are segmented packets find out how many can be
> +		 * sent until overflow occurs
> +		 */
> +		if (nb_segs_t > num) { /* there is at least 1 */
> +			uint32_t seg_cnt = 0;
> +			for (i = 0; i < num && seg_cnt < n_sqn; i++)
> +				seg_cnt += nb_segs[i];
> +			num = i - 1;
> +		} else {
> +			num = n_sqn; /* no segmented packets */
> +		}
> +	}
> 

Re: [dpdk-dev] [EXT] [PATCH 1/2] ipsec: add transmit segmentation offload support

[Nicolau, Radu]

Hi Akhil, I will address all issues except the last one with a comment 
below:

>> -	n = num;
>> -	sqn = esn_outb_update_sqn(sa, &n);
>> -	if (n != num)
>> +	n_sqn = nb_segs_t;
>> +	sqn = esn_outb_update_sqn(sa, &n_sqn);
>> +	if (n_sqn != nb_segs_t) {
>>   		rte_errno = EOVERFLOW;
> If it is an error condition, shouldn't we return.
> Also, I do not see rte_errno being checked anywhere in the app/test or ipsec-secgw.
We are sending all packets that don't cause a SN overflow, and we set 
the error flag. The user will see that not all packets were sent and and 
rte_errno, and this is the behaviour that was in place before this patch.
>
>> +		/* if there are segmented packets find out how many can be
>> +		 * sent until overflow occurs
>> +		 */
>> +		if (nb_segs_t > num) { /* there is at least 1 */
>> +			uint32_t seg_cnt = 0;
>> +			for (i = 0; i < num && seg_cnt < n_sqn; i++)
>> +				seg_cnt += nb_segs[i];
>> +			num = i - 1;
>> +		} else {
>> +			num = n_sqn; /* no segmented packets */
>> +		}
>> +	}
>>