diff --git a/lib/librte_ipsec/crypto.h b/lib/librte_ipsec/crypto.h
new file mode 100644
index 000000000..61f5c1433
--- /dev/null
+++ b/lib/librte_ipsec/crypto.h
@@ -0,0 +1,123 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+#ifndef _CRYPTO_H_
+#define _CRYPTO_H_
+
+/**
+ * @file crypto.h
+ * Contains crypto specific functions/structures/macros used internally
+ * by ipsec library.
+ */
+
+ /*
+  * AES-GCM devices have some specific requirements for IV and AAD formats.
+  * Ideally that to be done by the driver itself.
+  */
+
+struct aead_gcm_iv {
+	uint32_t salt;
+	uint64_t iv;
+	uint32_t cnt;
+} __attribute__((packed));
+
+struct aead_gcm_aad {
+	uint32_t spi;
+	/*
+	 * RFC 4106, section 5:
+	 * Two formats of the AAD are defined:
+	 * one for 32-bit sequence numbers, and one for 64-bit ESN.
+	 */
+	union {
+		uint32_t u32[2];
+		uint64_t u64;
+	} sqn;
+	uint32_t align0; /* align to 16B boundary */
+} __attribute__((packed));
+
+struct gcm_esph_iv {
+	struct esp_hdr esph;
+	uint64_t iv;
+} __attribute__((packed));
+
+
+static inline void
+aead_gcm_iv_fill(struct aead_gcm_iv *gcm, uint64_t iv, uint32_t salt)
+{
+	gcm->salt = salt;
+	gcm->iv = iv;
+	gcm->cnt = rte_cpu_to_be_32(1);
+}
+
+/*
+ * RFC 4106, 5 AAD Construction
+ * spi and sqn should already be converted into network byte order.
+ * Make sure that not used bytes are zeroed.
+ */
+static inline void
+aead_gcm_aad_fill(struct aead_gcm_aad *aad, rte_be32_t spi, rte_be64_t sqn,
+	int esn)
+{
+	aad->spi = spi;
+	if (esn)
+		aad->sqn.u64 = sqn;
+	else {
+		aad->sqn.u32[0] = sqn_low32(sqn);
+		aad->sqn.u32[1] = 0;
+	}
+	aad->align0 = 0;
+}
+
+static inline void
+gen_iv(uint64_t iv[IPSEC_MAX_IV_QWORD], rte_be64_t sqn)
+{
+	iv[0] = sqn;
+	iv[1] = 0;
+}
+
+/*
+ * from RFC 4303 3.3.2.1.4:
+ * If the ESN option is enabled for the SA, the high-order 32
+ * bits of the sequence number are appended after the Next Header field
+ * for purposes of this computation, but are not transmitted.
+ */
+
+/*
+ * Helper function that moves ICV by 4B below, and inserts SQN.hibits.
+ * icv parameter points to the new start of ICV.
+ */
+static inline void
+insert_sqh(uint32_t sqh, void *picv, uint32_t icv_len)
+{
+	uint32_t *icv;
+	int32_t i;
+
+	RTE_ASSERT(icv_len % sizeof(uint32_t) == 0);
+
+	icv = picv;
+	icv_len = icv_len / sizeof(uint32_t);
+	for (i = icv_len; i-- != 0; icv[i] = icv[i - 1])
+		;
+
+	icv[i] = sqh;
+}
+
+/*
+ * Helper function that moves ICV by 4B up, and removes SQN.hibits.
+ * icv parameter points to the new start of ICV.
+ */
+static inline void
+remove_sqh(void *picv, uint32_t icv_len)
+{
+	uint32_t i, *icv;
+
+	RTE_ASSERT(icv_len % sizeof(uint32_t) == 0);
+
+	icv = picv;
+	icv_len = icv_len / sizeof(uint32_t);
+	for (i = 0; i != icv_len; i++)
+		icv[i] = icv[i + 1];
+}
+
+#endif /* _CRYPTO_H_ */
diff --git a/lib/librte_ipsec/iph.h b/lib/librte_ipsec/iph.h
new file mode 100644
index 000000000..3fd93016d
--- /dev/null
+++ b/lib/librte_ipsec/iph.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+#ifndef _IPH_H_
+#define _IPH_H_
+
+/**
+ * @file iph.h
+ * Contains functions/structures/macros to manipulate IPv/IPv6 headers
+ * used internally by ipsec library.
+ */
+
+/*
+ * Move preceding (L3) headers down to remove ESP header and IV.
+ */
+static inline void
+remove_esph(char *np, char *op, uint32_t hlen)
+{
+	uint32_t i;
+
+	for (i = hlen; i-- != 0; np[i] = op[i])
+		;
+}
+
+/*
+ * Move preceding (L3) headers up to free space for ESP header and IV.
+ */
+static inline void
+insert_esph(char *np, char *op, uint32_t hlen)
+{
+	uint32_t i;
+
+	for (i = 0; i != hlen; i++)
+		np[i] = op[i];
+}
+
+/* update original ip header fields for trasnport case */
+static inline int
+update_trs_l3hdr(const struct rte_ipsec_sa *sa, void *p, uint32_t plen,
+		uint32_t l2len, uint32_t l3len, uint8_t proto)
+{
+	struct ipv4_hdr *v4h;
+	struct ipv6_hdr *v6h;
+	int32_t rc;
+
+	if ((sa->type & RTE_IPSEC_SATP_IPV_MASK) == RTE_IPSEC_SATP_IPV4) {
+		v4h = p;
+		rc = v4h->next_proto_id;
+		v4h->next_proto_id = proto;
+		v4h->total_length = rte_cpu_to_be_16(plen - l2len);
+	} else if (l3len == sizeof(*v6h)) {
+		v6h = p;
+		rc = v6h->proto;
+		v6h->proto = proto;
+		v6h->payload_len = rte_cpu_to_be_16(plen - l2len -
+				sizeof(*v6h));
+	/* need to add support for IPv6 with options */
+	} else
+		rc = -ENOTSUP;
+
+	return rc;
+}
+
+/* update original and new ip header fields for tunnel case */
+static inline void
+update_tun_l3hdr(const struct rte_ipsec_sa *sa, void *p, uint32_t plen,
+		uint32_t l2len, rte_be16_t pid)
+{
+	struct ipv4_hdr *v4h;
+	struct ipv6_hdr *v6h;
+
+	if (sa->type & RTE_IPSEC_SATP_MODE_TUNLV4) {
+		v4h = p;
+		v4h->packet_id = pid;
+		v4h->total_length = rte_cpu_to_be_16(plen - l2len);
+	} else {
+		v6h = p;
+		v6h->payload_len = rte_cpu_to_be_16(plen - l2len -
+				sizeof(*v6h));
+	}
+}
+
+#endif /* _IPH_H_ */
diff --git a/lib/librte_ipsec/ipsec_sqn.h b/lib/librte_ipsec/ipsec_sqn.h
index 4471814f9..a33ff9cca 100644
--- a/lib/librte_ipsec/ipsec_sqn.h
+++ b/lib/librte_ipsec/ipsec_sqn.h
@@ -15,6 +15,45 @@
 
 #define IS_ESN(sa)	((sa)->sqn_mask == UINT64_MAX)
 
+/*
+ * gets SQN.hi32 bits, SQN supposed to be in network byte order.
+ */
+static inline rte_be32_t
+sqn_hi32(rte_be64_t sqn)
+{
+#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+	return (sqn >> 32);
+#else
+	return sqn;
+#endif
+}
+
+/*
+ * gets SQN.low32 bits, SQN supposed to be in network byte order.
+ */
+static inline rte_be32_t
+sqn_low32(rte_be64_t sqn)
+{
+#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+	return sqn;
+#else
+	return (sqn >> 32);
+#endif
+}
+
+/*
+ * gets SQN.low16 bits, SQN supposed to be in network byte order.
+ */
+static inline rte_be16_t
+sqn_low16(rte_be64_t sqn)
+{
+#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+	return sqn;
+#else
+	return (sqn >> 48);
+#endif
+}
+
 /*
  * for given size, calculate required number of buckets.
  */
@@ -30,6 +69,153 @@ replay_num_bucket(uint32_t wsz)
 	return nb;
 }
 
+/*
+ * According to RFC4303 A2.1, determine the high-order bit of sequence number.
+ * use 32bit arithmetic inside, return uint64_t.
+ */
+static inline uint64_t
+reconstruct_esn(uint64_t t, uint32_t sqn, uint32_t w)
+{
+	uint32_t th, tl, bl;
+
+	tl = t;
+	th = t >> 32;
+	bl = tl - w + 1;
+
+	/* case A: window is within one sequence number subspace */
+	if (tl >= (w - 1))
+		th += (sqn < bl);
+	/* case B: window spans two sequence number subspaces */
+	else if (th != 0)
+		th -= (sqn >= bl);
+
+	/* return constructed sequence with proper high-order bits */
+	return (uint64_t)th << 32 | sqn;
+}
+
+/**
+ * Perform the replay checking.
+ *
+ * struct rte_ipsec_sa contains the window and window related parameters,
+ * such as the window size, bitmask, and the last acknowledged sequence number.
+ *
+ * Based on RFC 6479.
+ * Blocks are 64 bits unsigned integers
+ */
+static inline int32_t
+esn_inb_check_sqn(const struct replay_sqn *rsn, const struct rte_ipsec_sa *sa,
+	uint64_t sqn)
+{
+	uint32_t bit, bucket;
+
+	/* replay not enabled */
+	if (sa->replay.win_sz == 0)
+		return 0;
+
+	/* seq is larger than lastseq */
+	if (sqn > rsn->sqn)
+		return 0;
+
+	/* seq is outside window */
+	if (sqn == 0 || sqn + sa->replay.win_sz < rsn->sqn)
+		return -EINVAL;
+
+	/* seq is inside the window */
+	bit = sqn & WINDOW_BIT_LOC_MASK;
+	bucket = (sqn >> WINDOW_BUCKET_BITS) & sa->replay.bucket_index_mask;
+
+	/* already seen packet */
+	if (rsn->window[bucket] & ((uint64_t)1 << bit))
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * For outbound SA perform the sequence number update.
+ */
+static inline uint64_t
+esn_outb_update_sqn(struct rte_ipsec_sa *sa, uint32_t *num)
+{
+	uint64_t n, s, sqn;
+
+	n = *num;
+	sqn = sa->sqn.outb + n;
+	sa->sqn.outb = sqn;
+
+	/* overflow */
+	if (sqn > sa->sqn_mask) {
+		s = sqn - sa->sqn_mask;
+		*num = (s < n) ?  n - s : 0;
+	}
+
+	return sqn - n;
+}
+
+/**
+ * For inbound SA perform the sequence number and replay window update.
+ */
+static inline int32_t
+esn_inb_update_sqn(struct replay_sqn *rsn, const struct rte_ipsec_sa *sa,
+	uint64_t sqn)
+{
+	uint32_t bit, bucket, last_bucket, new_bucket, diff, i;
+
+	/* replay not enabled */
+	if (sa->replay.win_sz == 0)
+		return 0;
+
+	/* handle ESN */
+	if (IS_ESN(sa))
+		sqn = reconstruct_esn(rsn->sqn, sqn, sa->replay.win_sz);
+
+	/* seq is outside window*/
+	if (sqn == 0 || sqn + sa->replay.win_sz < rsn->sqn)
+		return -EINVAL;
+
+	/* update the bit */
+	bucket = (sqn >> WINDOW_BUCKET_BITS);
+
+	/* check if the seq is within the range */
+	if (sqn > rsn->sqn) {
+		last_bucket = rsn->sqn >> WINDOW_BUCKET_BITS;
+		diff = bucket - last_bucket;
+		/* seq is way after the range of WINDOW_SIZE */
+		if (diff > sa->replay.nb_bucket)
+			diff = sa->replay.nb_bucket;
+
+		for (i = 0; i != diff; i++) {
+			new_bucket = (i + last_bucket + 1) &
+				sa->replay.bucket_index_mask;
+			rsn->window[new_bucket] = 0;
+		}
+		rsn->sqn = sqn;
+	}
+
+	bucket &= sa->replay.bucket_index_mask;
+	bit = (uint64_t)1 << (sqn & WINDOW_BIT_LOC_MASK);
+
+	/* already seen packet */
+	if (rsn->window[bucket] & bit)
+		return -EINVAL;
+
+	rsn->window[bucket] |= bit;
+	return 0;
+}
+
+/**
+ * To achieve ability to do multiple readers single writer for
+ * SA replay window information and sequence number (RSN)
+ * basic RCU schema is used:
+ * SA have 2 copies of RSN (one for readers, another for writers).
+ * Each RSN contains a rwlock that has to be grabbed (for read/write)
+ * to avoid races between readers and writer.
+ * Writer is responsible to make a copy or reader RSN, update it
+ * and mark newly updated RSN as readers one.
+ * That approach is intended to minimize contention and cache sharing
+ * between writer and readers.
+ */
+
 /**
  * Based on number of buckets calculated required size for the
  * structure that holds replay window and sequnce number (RSN) information.
diff --git a/lib/librte_ipsec/pad.h b/lib/librte_ipsec/pad.h
new file mode 100644
index 000000000..2f5ccd00e
--- /dev/null
+++ b/lib/librte_ipsec/pad.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+#ifndef _PAD_H_
+#define _PAD_H_
+
+#define IPSEC_MAX_PAD_SIZE	UINT8_MAX
+
+static const uint8_t esp_pad_bytes[IPSEC_MAX_PAD_SIZE] = {
+	1, 2, 3, 4, 5, 6, 7, 8,
+	9, 10, 11, 12, 13, 14, 15, 16,
+	17, 18, 19, 20, 21, 22, 23, 24,
+	25, 26, 27, 28, 29, 30, 31, 32,
+	33, 34, 35, 36, 37, 38, 39, 40,
+	41, 42, 43, 44, 45, 46, 47, 48,
+	49, 50, 51, 52, 53, 54, 55, 56,
+	57, 58, 59, 60, 61, 62, 63, 64,
+	65, 66, 67, 68, 69, 70, 71, 72,
+	73, 74, 75, 76, 77, 78, 79, 80,
+	81, 82, 83, 84, 85, 86, 87, 88,
+	89, 90, 91, 92, 93, 94, 95, 96,
+	97, 98, 99, 100, 101, 102, 103, 104,
+	105, 106, 107, 108, 109, 110, 111, 112,
+	113, 114, 115, 116, 117, 118, 119, 120,
+	121, 122, 123, 124, 125, 126, 127, 128,
+	129, 130, 131, 132, 133, 134, 135, 136,
+	137, 138, 139, 140, 141, 142, 143, 144,
+	145, 146, 147, 148, 149, 150, 151, 152,
+	153, 154, 155, 156, 157, 158, 159, 160,
+	161, 162, 163, 164, 165, 166, 167, 168,
+	169, 170, 171, 172, 173, 174, 175, 176,
+	177, 178, 179, 180, 181, 182, 183, 184,
+	185, 186, 187, 188, 189, 190, 191, 192,
+	193, 194, 195, 196, 197, 198, 199, 200,
+	201, 202, 203, 204, 205, 206, 207, 208,
+	209, 210, 211, 212, 213, 214, 215, 216,
+	217, 218, 219, 220, 221, 222, 223, 224,
+	225, 226, 227, 228, 229, 230, 231, 232,
+	233, 234, 235, 236, 237, 238, 239, 240,
+	241, 242, 243, 244, 245, 246, 247, 248,
+	249, 250, 251, 252, 253, 254, 255,
+};
+
+#endif /* _PAD_H_ */
diff --git a/lib/librte_ipsec/sa.c b/lib/librte_ipsec/sa.c
index 7f9baa602..6643a3293 100644
--- a/lib/librte_ipsec/sa.c
+++ b/lib/librte_ipsec/sa.c
@@ -6,9 +6,13 @@
 #include <rte_esp.h>
 #include <rte_ip.h>
 #include <rte_errno.h>
+#include <rte_cryptodev.h>
 
 #include "sa.h"
 #include "ipsec_sqn.h"
+#include "crypto.h"
+#include "iph.h"
+#include "pad.h"
 
 /* some helper structures */
 struct crypto_xform {
@@ -192,6 +196,7 @@ esp_sa_init(struct rte_ipsec_sa *sa, const struct rte_ipsec_sa_prm *prm,
 		/* RFC 4106 */
 		if (cxf->aead->algo != RTE_CRYPTO_AEAD_AES_GCM)
 			return -EINVAL;
+		sa->aad_len = sizeof(struct aead_gcm_aad);
 		sa->icv_len = cxf->aead->digest_length;
 		sa->iv_ofs = cxf->aead->iv.offset;
 		sa->iv_len = sizeof(uint64_t);
@@ -306,18 +311,1053 @@ rte_ipsec_sa_init(struct rte_ipsec_sa *sa, const struct rte_ipsec_sa_prm *prm,
 	return sz;
 }
 
+static inline void
+mbuf_bulk_copy(struct rte_mbuf *dst[], struct rte_mbuf * const src[],
+	uint32_t num)
+{
+	uint32_t i;
+
+	for (i = 0; i != num; i++)
+		dst[i] = src[i];
+}
+
+static inline void
+lksd_none_cop_prepare(const struct rte_ipsec_session *ss,
+	struct rte_mbuf *mb[], struct rte_crypto_op *cop[], uint16_t num)
+{
+	uint32_t i;
+	struct rte_crypto_sym_op *sop;
+
+	for (i = 0; i != num; i++) {
+		sop = cop[i]->sym;
+		cop[i]->type = RTE_CRYPTO_OP_TYPE_SYMMETRIC;
+		cop[i]->status = RTE_CRYPTO_OP_STATUS_NOT_PROCESSED;
+		cop[i]->sess_type = RTE_CRYPTO_OP_WITH_SESSION;
+		sop->m_src = mb[i];
+		__rte_crypto_sym_op_attach_sym_session(sop, ss->crypto.ses);
+	}
+}
+
+static inline void
+esp_outb_cop_prepare(struct rte_crypto_op *cop,
+	const struct rte_ipsec_sa *sa, const uint64_t ivp[IPSEC_MAX_IV_QWORD],
+	const union sym_op_data *icv, uint32_t hlen, uint32_t plen)
+{
+	struct rte_crypto_sym_op *sop;
+	struct aead_gcm_iv *gcm;
+
+	/* fill sym op fields */
+	sop = cop->sym;
+
+	/* AEAD (AES_GCM) case */
+	if (sa->aad_len != 0) {
+		sop->aead.data.offset = sa->ctp.cipher.offset + hlen;
+		sop->aead.data.length = sa->ctp.cipher.length + plen;
+		sop->aead.digest.data = icv->va;
+		sop->aead.digest.phys_addr = icv->pa;
+		sop->aead.aad.data = icv->va + sa->icv_len;
+		sop->aead.aad.phys_addr = icv->pa + sa->icv_len;
+
+		/* fill AAD IV (located inside crypto op) */
+		gcm = rte_crypto_op_ctod_offset(cop, struct aead_gcm_iv *,
+			sa->iv_ofs);
+		aead_gcm_iv_fill(gcm, ivp[0], sa->salt);
+	/* CRYPT+AUTH case */
+	} else {
+		sop->cipher.data.offset = sa->ctp.cipher.offset + hlen;
+		sop->cipher.data.length = sa->ctp.cipher.length + plen;
+		sop->auth.data.offset = sa->ctp.auth.offset + hlen;
+		sop->auth.data.length = sa->ctp.auth.length + plen;
+		sop->auth.digest.data = icv->va;
+		sop->auth.digest.phys_addr = icv->pa;
+	}
+}
+
+static inline int32_t
+esp_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)
+{
+	uint32_t clen, hlen, l2len, pdlen, pdofs, plen, tlen;
+	struct rte_mbuf *ml;
+	struct esp_hdr *esph;
+	struct esp_tail *espt;
+	char *ph, *pt;
+	uint64_t *iv;
+
+	/* calculate extra header space required */
+	hlen = sa->hdr_len + sa->iv_len + sizeof(*esph);
+
+	/* size of ipsec protected data */
+	l2len = mb->l2_len;
+	plen = mb->pkt_len - mb->l2_len;
+
+	/* number of bytes to encrypt */
+	clen = plen + sizeof(*espt);
+	clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
+
+	/* pad length + esp tail */
+	pdlen = clen - plen;
+	tlen = pdlen + sa->icv_len;
+
+	/* do append and prepend */
+	ml = rte_pktmbuf_lastseg(mb);
+	if (tlen + sa->sqh_len + sa->aad_len > rte_pktmbuf_tailroom(ml))
+		return -ENOSPC;
+
+	/* prepend header */
+	ph = rte_pktmbuf_prepend(mb, hlen - l2len);
+	if (ph == NULL)
+		return -ENOSPC;
+
+	/* append tail */
+	pdofs = ml->data_len;
+	ml->data_len += tlen;
+	mb->pkt_len += tlen;
+	pt = rte_pktmbuf_mtod_offset(ml, typeof(pt), pdofs);
+
+	/* update pkt l2/l3 len */
+	mb->l2_len = sa->hdr_l3_off;
+	mb->l3_len = sa->hdr_len - sa->hdr_l3_off;
+
+	/* copy tunnel pkt header */
+	rte_memcpy(ph, sa->hdr, sa->hdr_len);
+
+	/* update original and new ip header fields */
+	update_tun_l3hdr(sa, ph + sa->hdr_l3_off, mb->pkt_len, sa->hdr_l3_off,
+			sqn_low16(sqc));
+
+	/* update spi, seqn and iv */
+	esph = (struct esp_hdr *)(ph + sa->hdr_len);
+	iv = (uint64_t *)(esph + 1);
+	rte_memcpy(iv, ivp, sa->iv_len);
+
+	esph->spi = sa->spi;
+	esph->seq = sqn_low32(sqc);
+
+	/* offset for ICV */
+	pdofs += pdlen + sa->sqh_len;
+
+	/* pad length */
+	pdlen -= sizeof(*espt);
+
+	/* copy padding data */
+	rte_memcpy(pt, esp_pad_bytes, pdlen);
+
+	/* update esp trailer */
+	espt = (struct esp_tail *)(pt + pdlen);
+	espt->pad_len = pdlen;
+	espt->next_proto = sa->proto;
+
+	icv->va = rte_pktmbuf_mtod_offset(ml, void *, pdofs);
+	icv->pa = rte_pktmbuf_iova_offset(ml, pdofs);
+
+	return clen;
+}
+
+/*
+ * for pure cryptodev (lookaside none) depending on SA settings,
+ * we might have to write some extra data to the packet.
+ */
+static inline void
+outb_pkt_xprepare(const struct rte_ipsec_sa *sa, rte_be64_t sqc,
+	const union sym_op_data *icv)
+{
+	uint32_t *psqh;
+	struct aead_gcm_aad *aad;
+
+	/* insert SQN.hi between ESP trailer and ICV */
+	if (sa->sqh_len != 0) {
+		psqh = (uint32_t *)(icv->va - sa->sqh_len);
+		psqh[0] = sqn_hi32(sqc);
+	}
+
+	/*
+	 * fill IV and AAD fields, if any (aad fields are placed after icv),
+	 * right now we support only one AEAD algorithm: AES-GCM .
+	 */
+	if (sa->aad_len != 0) {
+		aad = (struct aead_gcm_aad *)(icv->va + sa->icv_len);
+		aead_gcm_aad_fill(aad, sa->spi, sqc, IS_ESN(sa));
+	}
+}
+
+static uint16_t
+outb_tun_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
+	struct rte_crypto_op *cop[], uint16_t num)
+{
+	int32_t rc;
+	uint32_t i, k, n;
+	uint64_t sqn;
+	rte_be64_t sqc;
+	struct rte_ipsec_sa *sa;
+	union sym_op_data icv;
+	uint64_t iv[IPSEC_MAX_IV_QWORD];
+	struct rte_mbuf *dr[num];
+
+	sa = ss->sa;
+
+	n = num;
+	sqn = esn_outb_update_sqn(sa, &n);
+	if (n != num)
+		rte_errno = EOVERFLOW;
+
+	k = 0;
+	for (i = 0; i != n; i++) {
+
+		sqc = rte_cpu_to_be_64(sqn + i);
+		gen_iv(iv, sqc);
+
+		/* try to update the packet itself */
+		rc = esp_outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv);
+
+		/* success, setup crypto op */
+		if (rc >= 0) {
+			mb[k] = mb[i];
+			outb_pkt_xprepare(sa, sqc, &icv);
+			esp_outb_cop_prepare(cop[k], sa, iv, &icv, 0, rc);
+			k++;
+		/* failure, put packet into the death-row */
+		} else {
+			dr[i - k] = mb[i];
+			rte_errno = -rc;
+		}
+	}
+
+	/* update cops */
+	lksd_none_cop_prepare(ss, mb, cop, k);
+
+	 /* copy not prepared mbufs beyond good ones */
+	if (k != num && k != 0)
+		mbuf_bulk_copy(mb + k, dr, num - k);
+
+	return k;
+}
+
+static inline int32_t
+esp_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,
+	uint32_t l2len, uint32_t l3len, union sym_op_data *icv)
+{
+	uint8_t np;
+	uint32_t clen, hlen, pdlen, pdofs, plen, tlen, uhlen;
+	struct rte_mbuf *ml;
+	struct esp_hdr *esph;
+	struct esp_tail *espt;
+	char *ph, *pt;
+	uint64_t *iv;
+
+	uhlen = l2len + l3len;
+	plen = mb->pkt_len - uhlen;
+
+	/* calculate extra header space required */
+	hlen = sa->iv_len + sizeof(*esph);
+
+	/* number of bytes to encrypt */
+	clen = plen + sizeof(*espt);
+	clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
+
+	/* pad length + esp tail */
+	pdlen = clen - plen;
+	tlen = pdlen + sa->icv_len;
+
+	/* do append and insert */
+	ml = rte_pktmbuf_lastseg(mb);
+	if (tlen + sa->sqh_len + sa->aad_len > rte_pktmbuf_tailroom(ml))
+		return -ENOSPC;
+
+	/* prepend space for ESP header */
+	ph = rte_pktmbuf_prepend(mb, hlen);
+	if (ph == NULL)
+		return -ENOSPC;
+
+	/* append tail */
+	pdofs = ml->data_len;
+	ml->data_len += tlen;
+	mb->pkt_len += tlen;
+	pt = rte_pktmbuf_mtod_offset(ml, typeof(pt), pdofs);
+
+	/* shift L2/L3 headers */
+	insert_esph(ph, ph + hlen, uhlen);
+
+	/* update ip  header fields */
+	np = update_trs_l3hdr(sa, ph + l2len, mb->pkt_len, l2len, l3len,
+			IPPROTO_ESP);
+
+	/* update spi, seqn and iv */
+	esph = (struct esp_hdr *)(ph + uhlen);
+	iv = (uint64_t *)(esph + 1);
+	rte_memcpy(iv, ivp, sa->iv_len);
+
+	esph->spi = sa->spi;
+	esph->seq = sqn_low32(sqc);
+
+	/* offset for ICV */
+	pdofs += pdlen + sa->sqh_len;
+
+	/* pad length */
+	pdlen -= sizeof(*espt);
+
+	/* copy padding data */
+	rte_memcpy(pt, esp_pad_bytes, pdlen);
+
+	/* update esp trailer */
+	espt = (struct esp_tail *)(pt + pdlen);
+	espt->pad_len = pdlen;
+	espt->next_proto = np;
+
+	icv->va = rte_pktmbuf_mtod_offset(ml, void *, pdofs);
+	icv->pa = rte_pktmbuf_iova_offset(ml, pdofs);
+
+	return clen;
+}
+
+static uint16_t
+outb_trs_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
+	struct rte_crypto_op *cop[], uint16_t num)
+{
+	int32_t rc;
+	uint32_t i, k, n, l2, l3;
+	uint64_t sqn;
+	rte_be64_t sqc;
+	struct rte_ipsec_sa *sa;
+	union sym_op_data icv;
+	uint64_t iv[IPSEC_MAX_IV_QWORD];
+	struct rte_mbuf *dr[num];
+
+	sa = ss->sa;
+
+	n = num;
+	sqn = esn_outb_update_sqn(sa, &n);
+	if (n != num)
+		rte_errno = EOVERFLOW;
+
+	k = 0;
+	for (i = 0; i != n; i++) {
+
+		l2 = mb[i]->l2_len;
+		l3 = mb[i]->l3_len;
+
+		sqc = rte_cpu_to_be_64(sqn + i);
+		gen_iv(iv, sqc);
+
+		/* try to update the packet itself */
+		rc = esp_outb_trs_pkt_prepare(sa, sqc, iv, mb[i],
+				l2, l3, &icv);
+
+		/* success, setup crypto op */
+		if (rc >= 0) {
+			mb[k] = mb[i];
+			outb_pkt_xprepare(sa, sqc, &icv);
+			esp_outb_cop_prepare(cop[k], sa, iv, &icv, l2 + l3, rc);
+			k++;
+		/* failure, put packet into the death-row */
+		} else {
+			dr[i - k] = mb[i];
+			rte_errno = -rc;
+		}
+	}
+
+	/* update cops */
+	lksd_none_cop_prepare(ss, mb, cop, k);
+
+	/* copy not prepared mbufs beyond good ones */
+	if (k != num && k != 0)
+		mbuf_bulk_copy(mb + k, dr, num - k);
+
+	return k;
+}
+
+static inline int32_t
+esp_inb_tun_cop_prepare(struct rte_crypto_op *cop,
+	const struct rte_ipsec_sa *sa, struct rte_mbuf *mb,
+	const union sym_op_data *icv, uint32_t pofs, uint32_t plen)
+{
+	struct rte_crypto_sym_op *sop;
+	struct aead_gcm_iv *gcm;
+	uint64_t *ivc, *ivp;
+	uint32_t clen;
+
+	clen = plen - sa->ctp.cipher.length;
+	if ((int32_t)clen < 0 || (clen & (sa->pad_align - 1)) != 0)
+		return -EINVAL;
+
+	/* fill sym op fields */
+	sop = cop->sym;
+
+	/* AEAD (AES_GCM) case */
+	if (sa->aad_len != 0) {
+		sop->aead.data.offset = pofs + sa->ctp.cipher.offset;
+		sop->aead.data.length = clen;
+		sop->aead.digest.data = icv->va;
+		sop->aead.digest.phys_addr = icv->pa;
+		sop->aead.aad.data = icv->va + sa->icv_len;
+		sop->aead.aad.phys_addr = icv->pa + sa->icv_len;
+
+		/* fill AAD IV (located inside crypto op) */
+		gcm = rte_crypto_op_ctod_offset(cop, struct aead_gcm_iv *,
+			sa->iv_ofs);
+		ivp = rte_pktmbuf_mtod_offset(mb, uint64_t *,
+			pofs + sizeof(struct esp_hdr));
+		aead_gcm_iv_fill(gcm, ivp[0], sa->salt);
+	/* CRYPT+AUTH case */
+	} else {
+		sop->cipher.data.offset = pofs + sa->ctp.cipher.offset;
+		sop->cipher.data.length = clen;
+		sop->auth.data.offset = pofs + sa->ctp.auth.offset;
+		sop->auth.data.length = plen - sa->ctp.auth.length;
+		sop->auth.digest.data = icv->va;
+		sop->auth.digest.phys_addr = icv->pa;
+
+		/* copy iv from the input packet to the cop */
+		ivc = rte_crypto_op_ctod_offset(cop, uint64_t *, sa->iv_ofs);
+		ivp = rte_pktmbuf_mtod_offset(mb, uint64_t *,
+			pofs + sizeof(struct esp_hdr));
+		rte_memcpy(ivc, ivp, sa->iv_len);
+	}
+	return 0;
+}
+
+/*
+ * for pure cryptodev (lookaside none) depending on SA settings,
+ * we might have to write some extra data to the packet.
+ */
+static inline void
+inb_pkt_xprepare(const struct rte_ipsec_sa *sa, rte_be64_t sqc,
+	const union sym_op_data *icv)
+{
+	struct aead_gcm_aad *aad;
+
+	/* insert SQN.hi between ESP trailer and ICV */
+	if (sa->sqh_len != 0)
+		insert_sqh(sqn_hi32(sqc), icv->va, sa->icv_len);
+
+	/*
+	 * fill AAD fields, if any (aad fields are placed after icv),
+	 * right now we support only one AEAD algorithm: AES-GCM.
+	 */
+	if (sa->aad_len != 0) {
+		aad = (struct aead_gcm_aad *)(icv->va + sa->icv_len);
+		aead_gcm_aad_fill(aad, sa->spi, sqc, IS_ESN(sa));
+	}
+}
+
+static inline int32_t
+esp_inb_tun_pkt_prepare(const struct rte_ipsec_sa *sa,
+	const struct replay_sqn *rsn, struct rte_mbuf *mb,
+	uint32_t hlen, union sym_op_data *icv)
+{
+	int32_t rc;
+	uint64_t sqn;
+	uint32_t icv_ofs, plen;
+	struct rte_mbuf *ml;
+	struct esp_hdr *esph;
+
+	esph = rte_pktmbuf_mtod_offset(mb, struct esp_hdr *, hlen);
+
+	/*
+	 * retrieve and reconstruct SQN, then check it, then
+	 * convert it back into network byte order.
+	 */
+	sqn = rte_be_to_cpu_32(esph->seq);
+	if (IS_ESN(sa))
+		sqn = reconstruct_esn(rsn->sqn, sqn, sa->replay.win_sz);
+
+	rc = esn_inb_check_sqn(rsn, sa, sqn);
+	if (rc != 0)
+		return rc;
+
+	sqn = rte_cpu_to_be_64(sqn);
+
+	/* start packet manipulation */
+	plen = mb->pkt_len;
+	plen = plen - hlen;
+
+	ml = rte_pktmbuf_lastseg(mb);
+	icv_ofs = ml->data_len - sa->icv_len + sa->sqh_len;
+
+	/* we have to allocate space for AAD somewhere,
+	 * right now - just use free trailing space at the last segment.
+	 * Would probably be more convenient to reserve space for AAD
+	 * inside rte_crypto_op itself
+	 * (again for IV space is already reserved inside cop).
+	 */
+	if (sa->aad_len + sa->sqh_len > rte_pktmbuf_tailroom(ml))
+		return -ENOSPC;
+
+	icv->va = rte_pktmbuf_mtod_offset(ml, void *, icv_ofs);
+	icv->pa = rte_pktmbuf_iova_offset(ml, icv_ofs);
+
+	inb_pkt_xprepare(sa, sqn, icv);
+	return plen;
+}
+
+static uint16_t
+inb_pkt_prepare(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
+	struct rte_crypto_op *cop[], uint16_t num)
+{
+	int32_t rc;
+	uint32_t i, k, hl;
+	struct rte_ipsec_sa *sa;
+	struct replay_sqn *rsn;
+	union sym_op_data icv;
+	struct rte_mbuf *dr[num];
+
+	sa = ss->sa;
+	rsn = sa->sqn.inb;
+
+	k = 0;
+	for (i = 0; i != num; i++) {
+
+		hl = mb[i]->l2_len + mb[i]->l3_len;
+		rc = esp_inb_tun_pkt_prepare(sa, rsn, mb[i], hl, &icv);
+		if (rc >= 0)
+			rc = esp_inb_tun_cop_prepare(cop[k], sa, mb[i], &icv,
+				hl, rc);
+
+		if (rc == 0)
+			mb[k++] = mb[i];
+		else {
+			dr[i - k] = mb[i];
+			rte_errno = -rc;
+		}
+	}
+
+	/* update cops */
+	lksd_none_cop_prepare(ss, mb, cop, k);
+
+	/* copy not prepared mbufs beyond good ones */
+	if (k != num && k != 0)
+		mbuf_bulk_copy(mb + k, dr, num - k);
+
+	return k;
+}
+
+static inline void
+lksd_proto_cop_prepare(const struct rte_ipsec_session *ss,
+	struct rte_mbuf *mb[], struct rte_crypto_op *cop[], uint16_t num)
+{
+	uint32_t i;
+	struct rte_crypto_sym_op *sop;
+
+	for (i = 0; i != num; i++) {
+		sop = cop[i]->sym;
+		cop[i]->type = RTE_CRYPTO_OP_TYPE_SYMMETRIC;
+		cop[i]->status = RTE_CRYPTO_OP_STATUS_NOT_PROCESSED;
+		cop[i]->sess_type = RTE_CRYPTO_OP_SECURITY_SESSION;
+		sop->m_src = mb[i];
+		__rte_security_attach_session(sop, ss->security.ses);
+	}
+}
+
+static uint16_t
+lksd_proto_prepare(const struct rte_ipsec_session *ss,
+	struct rte_mbuf *mb[], struct rte_crypto_op *cop[], uint16_t num)
+{
+	lksd_proto_cop_prepare(ss, mb, cop, num);
+	return num;
+}
+
+static inline int
+esp_inb_tun_single_pkt_process(struct rte_ipsec_sa *sa, struct rte_mbuf *mb,
+	uint32_t *sqn)
+{
+	uint32_t hlen, icv_len, tlen;
+	struct esp_hdr *esph;
+	struct esp_tail *espt;
+	struct rte_mbuf *ml;
+	char *pd;
+
+	if (mb->ol_flags & PKT_RX_SEC_OFFLOAD_FAILED)
+		return -EBADMSG;
+
+	icv_len = sa->icv_len;
+
+	ml = rte_pktmbuf_lastseg(mb);
+	espt = rte_pktmbuf_mtod_offset(ml, struct esp_tail *,
+		ml->data_len - icv_len - sizeof(*espt));
+
+	/*
+	 * check padding and next proto.
+	 * return an error if something is wrong.
+	 */
+	pd = (char *)espt - espt->pad_len;
+	if (espt->next_proto != sa->proto ||
+			memcmp(pd, esp_pad_bytes, espt->pad_len))
+		return -EINVAL;
+
+	/* cut of ICV, ESP tail and padding bytes */
+	tlen = icv_len + sizeof(*espt) + espt->pad_len;
+	ml->data_len -= tlen;
+	mb->pkt_len -= tlen;
+
+	/* cut of L2/L3 headers, ESP header and IV */
+	hlen = mb->l2_len + mb->l3_len;
+	esph = rte_pktmbuf_mtod_offset(mb, struct esp_hdr *, hlen);
+	rte_pktmbuf_adj(mb, hlen + sa->ctp.cipher.offset);
+
+	/* retrieve SQN for later check */
+	*sqn = rte_be_to_cpu_32(esph->seq);
+
+	/* reset mbuf metatdata: L2/L3 len, packet type */
+	mb->packet_type = RTE_PTYPE_UNKNOWN;
+	mb->l2_len = 0;
+	mb->l3_len = 0;
+
+	/* clear the PKT_RX_SEC_OFFLOAD flag if set */
+	mb->ol_flags &= ~(mb->ol_flags & PKT_RX_SEC_OFFLOAD);
+	return 0;
+}
+
+static inline int
+esp_inb_trs_single_pkt_process(struct rte_ipsec_sa *sa, struct rte_mbuf *mb,
+	uint32_t *sqn)
+{
+	uint32_t hlen, icv_len, l2len, l3len, tlen;
+	struct esp_hdr *esph;
+	struct esp_tail *espt;
+	struct rte_mbuf *ml;
+	char *np, *op, *pd;
+
+	if (mb->ol_flags & PKT_RX_SEC_OFFLOAD_FAILED)
+		return -EBADMSG;
+
+	icv_len = sa->icv_len;
+
+	ml = rte_pktmbuf_lastseg(mb);
+	espt = rte_pktmbuf_mtod_offset(ml, struct esp_tail *,
+		ml->data_len - icv_len - sizeof(*espt));
+
+	/* check padding, return an error if something is wrong. */
+	pd = (char *)espt - espt->pad_len;
+	if (memcmp(pd, esp_pad_bytes, espt->pad_len))
+		return -EINVAL;
+
+	/* cut of ICV, ESP tail and padding bytes */
+	tlen = icv_len + sizeof(*espt) + espt->pad_len;
+	ml->data_len -= tlen;
+	mb->pkt_len -= tlen;
+
+	/* retrieve SQN for later check */
+	l2len = mb->l2_len;
+	l3len = mb->l3_len;
+	hlen = l2len + l3len;
+	op = rte_pktmbuf_mtod(mb, char *);
+	esph = (struct esp_hdr *)(op + hlen);
+	*sqn = rte_be_to_cpu_32(esph->seq);
+
+	/* cut off ESP header and IV, update L3 header */
+	np = rte_pktmbuf_adj(mb, sa->ctp.cipher.offset);
+	remove_esph(np, op, hlen);
+	update_trs_l3hdr(sa, np + l2len, mb->pkt_len, l2len, l3len,
+			espt->next_proto);
+
+	/* reset mbuf packet type */
+	mb->packet_type &= (RTE_PTYPE_L2_MASK | RTE_PTYPE_L3_MASK);
+
+	/* clear the PKT_RX_SEC_OFFLOAD flag if set */
+	mb->ol_flags &= ~(mb->ol_flags & PKT_RX_SEC_OFFLOAD);
+	return 0;
+}
+
+static inline uint16_t
+esp_inb_rsn_update(struct rte_ipsec_sa *sa, const uint32_t sqn[],
+	struct rte_mbuf *mb[], struct rte_mbuf *dr[], uint16_t num)
+{
+	uint32_t i, k;
+	struct replay_sqn *rsn;
+
+	rsn = sa->sqn.inb;
+
+	k = 0;
+	for (i = 0; i != num; i++) {
+		if (esn_inb_update_sqn(rsn, sa, sqn[i]) == 0)
+			mb[k++] = mb[i];
+		else
+			dr[i - k] = mb[i];
+	}
+
+	return k;
+}
+
+static uint16_t
+inb_tun_pkt_process(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
+	uint16_t num)
+{
+	uint32_t i, k;
+	struct rte_ipsec_sa *sa;
+	uint32_t sqn[num];
+	struct rte_mbuf *dr[num];
+
+	sa = ss->sa;
+
+	/* process packets, extract seq numbers */
+
+	k = 0;
+	for (i = 0; i != num; i++) {
+		/* good packet */
+		if (esp_inb_tun_single_pkt_process(sa, mb[i], sqn + k) == 0)
+			mb[k++] = mb[i];
+		/* bad packet, will drop from furhter processing */
+		else
+			dr[i - k] = mb[i];
+	}
+
+	/* update seq # and replay winow */
+	k = esp_inb_rsn_update(sa, sqn, mb, dr + i - k, k);
+
+	/* handle unprocessed mbufs */
+	if (k != num) {
+		rte_errno = EBADMSG;
+		if (k != 0)
+			mbuf_bulk_copy(mb + k, dr, num - k);
+	}
+
+	return k;
+}
+
+static uint16_t
+inb_trs_pkt_process(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
+	uint16_t num)
+{
+	uint32_t i, k;
+	uint32_t sqn[num];
+	struct rte_ipsec_sa *sa;
+	struct rte_mbuf *dr[num];
+
+	sa = ss->sa;
+
+	/* process packets, extract seq numbers */
+
+	k = 0;
+	for (i = 0; i != num; i++) {
+		/* good packet */
+		if (esp_inb_trs_single_pkt_process(sa, mb[i], sqn + k) == 0)
+			mb[k++] = mb[i];
+		/* bad packet, will drop from furhter processing */
+		else
+			dr[i - k] = mb[i];
+	}
+
+	/* update seq # and replay winow */
+	k = esp_inb_rsn_update(sa, sqn, mb, dr + i - k, k);
+
+	/* handle unprocessed mbufs */
+	if (k != num) {
+		rte_errno = EBADMSG;
+		if (k != 0)
+			mbuf_bulk_copy(mb + k, dr, num - k);
+	}
+
+	return k;
+}
+
+/*
+ * process outbound packets for SA with ESN support,
+ * for algorithms that require SQN.hibits to be implictly included
+ * into digest computation.
+ * In that case we have to move ICV bytes back to their proper place.
+ */
+static uint16_t
+outb_sqh_process(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
+	uint16_t num)
+{
+	uint32_t i, k, icv_len, *icv;
+	struct rte_mbuf *ml;
+	struct rte_ipsec_sa *sa;
+	struct rte_mbuf *dr[num];
+
+	sa = ss->sa;
+
+	k = 0;
+	icv_len = sa->icv_len;
+
+	for (i = 0; i != num; i++) {
+		if ((mb[i]->ol_flags & PKT_RX_SEC_OFFLOAD_FAILED) == 0) {
+			ml = rte_pktmbuf_lastseg(mb[i]);
+			icv = rte_pktmbuf_mtod_offset(ml, void *,
+				ml->data_len - icv_len);
+			remove_sqh(icv, icv_len);
+			mb[k++] = mb[i];
+		} else
+			dr[i - k] = mb[i];
+	}
+
+	/* handle unprocessed mbufs */
+	if (k != num) {
+		rte_errno = EBADMSG;
+		if (k != 0)
+			mbuf_bulk_copy(mb + k, dr, num - k);
+	}
+
+	return k;
+}
+
+/*
+ * simplest pkt process routine:
+ * all actual processing is done already doneby HW/PMD,
+ * just check mbuf ol_flags.
+ * used for:
+ * - inbound for RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL
+ * - inbound/outbound for RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL
+ * - outbound for RTE_SECURITY_ACTION_TYPE_NONE when ESN is disabled
+ */
+static uint16_t
+pkt_flag_process(const struct rte_ipsec_session *ss, struct rte_mbuf *mb[],
+	uint16_t num)
+{
+	uint32_t i, k;
+	struct rte_mbuf *dr[num];
+
+	RTE_SET_USED(ss);
+
+	k = 0;
+	for (i = 0; i != num; i++) {
+		if ((mb[i]->ol_flags & PKT_RX_SEC_OFFLOAD_FAILED) == 0)
+			mb[k++] = mb[i];
+		else
+			dr[i - k] = mb[i];
+	}
+
+	/* handle unprocessed mbufs */
+	if (k != num) {
+		rte_errno = EBADMSG;
+		if (k != 0)
+			mbuf_bulk_copy(mb + k, dr, num - k);
+	}
+
+	return k;
+}
+
+/*
+ * prepare packets for inline ipsec processing:
+ * set ol_flags and attach metadata.
+ */
+static inline void
+inline_outb_mbuf_prepare(const struct rte_ipsec_session *ss,
+	struct rte_mbuf *mb[], uint16_t num)
+{
+	uint32_t i, ol_flags;
+
+	ol_flags = ss->security.ol_flags & RTE_SECURITY_TX_OLOAD_NEED_MDATA;
+	for (i = 0; i != num; i++) {
+
+		mb[i]->ol_flags |= PKT_TX_SEC_OFFLOAD;
+		if (ol_flags != 0)
+			rte_security_set_pkt_metadata(ss->security.ctx,
+				ss->security.ses, mb[i], NULL);
+	}
+}
+
+static uint16_t
+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;
+	uint64_t sqn;
+	rte_be64_t sqc;
+	struct rte_ipsec_sa *sa;
+	union sym_op_data icv;
+	uint64_t iv[IPSEC_MAX_IV_QWORD];
+	struct rte_mbuf *dr[num];
+
+	sa = ss->sa;
+
+	n = num;
+	sqn = esn_outb_update_sqn(sa, &n);
+	if (n != num)
+		rte_errno = EOVERFLOW;
+
+	k = 0;
+	for (i = 0; i != n; i++) {
+
+		sqc = rte_cpu_to_be_64(sqn + i);
+		gen_iv(iv, sqc);
+
+		/* try to update the packet itself */
+		rc = esp_outb_tun_pkt_prepare(sa, sqc, iv, mb[i], &icv);
+
+		/* success, update mbuf fields */
+		if (rc >= 0)
+			mb[k++] = mb[i];
+		/* failure, put packet into the death-row */
+		else {
+			dr[i - k] = mb[i];
+			rte_errno = -rc;
+		}
+	}
+
+	inline_outb_mbuf_prepare(ss, mb, k);
+
+	/* copy not processed mbufs beyond good ones */
+	if (k != num && k != 0)
+		mbuf_bulk_copy(mb + k, dr, num - k);
+
+	return k;
+}
+
+static uint16_t
+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, l2, l3;
+	uint64_t sqn;
+	rte_be64_t sqc;
+	struct rte_ipsec_sa *sa;
+	union sym_op_data icv;
+	uint64_t iv[IPSEC_MAX_IV_QWORD];
+	struct rte_mbuf *dr[num];
+
+	sa = ss->sa;
+
+	n = num;
+	sqn = esn_outb_update_sqn(sa, &n);
+	if (n != num)
+		rte_errno = EOVERFLOW;
+
+	k = 0;
+	for (i = 0; i != n; i++) {
+
+		l2 = mb[i]->l2_len;
+		l3 = mb[i]->l3_len;
+
+		sqc = rte_cpu_to_be_64(sqn + i);
+		gen_iv(iv, sqc);
+
+		/* try to update the packet itself */
+		rc = esp_outb_trs_pkt_prepare(sa, sqc, iv, mb[i],
+				l2, l3, &icv);
+
+		/* success, update mbuf fields */
+		if (rc >= 0)
+			mb[k++] = mb[i];
+		/* failure, put packet into the death-row */
+		else {
+			dr[i - k] = mb[i];
+			rte_errno = -rc;
+		}
+	}
+
+	inline_outb_mbuf_prepare(ss, mb, k);
+
+	/* copy not processed mbufs beyond good ones */
+	if (k != num && k != 0)
+		mbuf_bulk_copy(mb + k, dr, num - k);
+
+	return k;
+}
+
+/*
+ * outbound for RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL:
+ * actual processing is done by HW/PMD, just set flags and metadata.
+ */
+static uint16_t
+outb_inline_proto_process(const struct rte_ipsec_session *ss,
+		struct rte_mbuf *mb[], uint16_t num)
+{
+	inline_outb_mbuf_prepare(ss, mb, num);
+	return num;
+}
+
+static int
+lksd_none_pkt_func_select(const struct rte_ipsec_sa *sa,
+		struct rte_ipsec_sa_pkt_func *pf)
+{
+	int32_t rc;
+
+	static const uint64_t msk = RTE_IPSEC_SATP_DIR_MASK |
+			RTE_IPSEC_SATP_MODE_MASK;
+
+	rc = 0;
+	switch (sa->type & msk) {
+	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TUNLV4):
+	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TUNLV6):
+		pf->prepare = inb_pkt_prepare;
+		pf->process = inb_tun_pkt_process;
+		break;
+	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TRANS):
+		pf->prepare = inb_pkt_prepare;
+		pf->process = inb_trs_pkt_process;
+		break;
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV4):
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV6):
+		pf->prepare = outb_tun_prepare;
+		pf->process = (sa->sqh_len != 0) ?
+			outb_sqh_process : pkt_flag_process;
+		break;
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TRANS):
+		pf->prepare = outb_trs_prepare;
+		pf->process = (sa->sqh_len != 0) ?
+			outb_sqh_process : pkt_flag_process;
+		break;
+	default:
+		rc = -ENOTSUP;
+	}
+
+	return rc;
+}
+
+static int
+inline_crypto_pkt_func_select(const struct rte_ipsec_sa *sa,
+		struct rte_ipsec_sa_pkt_func *pf)
+{
+	int32_t rc;
+
+	static const uint64_t msk = RTE_IPSEC_SATP_DIR_MASK |
+			RTE_IPSEC_SATP_MODE_MASK;
+
+	rc = 0;
+	switch (sa->type & msk) {
+	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TUNLV4):
+	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TUNLV6):
+		pf->process = inb_tun_pkt_process;
+		break;
+	case (RTE_IPSEC_SATP_DIR_IB | RTE_IPSEC_SATP_MODE_TRANS):
+		pf->process = inb_trs_pkt_process;
+		break;
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV4):
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TUNLV6):
+		pf->process = inline_outb_tun_pkt_process;
+		break;
+	case (RTE_IPSEC_SATP_DIR_OB | RTE_IPSEC_SATP_MODE_TRANS):
+		pf->process = inline_outb_trs_pkt_process;
+		break;
+	default:
+		rc = -ENOTSUP;
+	}
+
+	return rc;
+}
+
 int
 ipsec_sa_pkt_func_select(const struct rte_ipsec_session *ss,
 	const struct rte_ipsec_sa *sa, struct rte_ipsec_sa_pkt_func *pf)
 {
 	int32_t rc;
 
-	RTE_SET_USED(sa);
-
 	rc = 0;
 	pf[0] = (struct rte_ipsec_sa_pkt_func) { 0 };
 
 	switch (ss->type) {
+	case RTE_SECURITY_ACTION_TYPE_NONE:
+		rc = lksd_none_pkt_func_select(sa, pf);
+		break;
+	case RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO:
+		rc = inline_crypto_pkt_func_select(sa, pf);
+		break;
+	case RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL:
+		if ((sa->type & RTE_IPSEC_SATP_DIR_MASK) ==
+				RTE_IPSEC_SATP_DIR_IB)
+			pf->process = pkt_flag_process;
+		else
+			pf->process = outb_inline_proto_process;
+		break;
+	case RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL:
+		pf->prepare = lksd_proto_prepare;
+		pf->process = pkt_flag_process;
+		break;
 	default:
 		rc = -ENOTSUP;
 	}
