Function outb_pkt_xprepare

dpdk/lib/ipsec/esp_outb.c:243–286

* for pure cryptodev (lookaside none) depending on SA settings, * we might have to write some extra data to the packet. */

 * 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 *gaad;
	struct aead_ccm_aad *caad;
	struct aead_chacha20_poly1305_aad *chacha20_poly1305_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 .
	 */
	switch (sa->algo_type) {
	case ALGO_TYPE_AES_GCM:
	if (sa->aad_len != 0) {
		gaad = (struct aead_gcm_aad *)(icv->va + sa->icv_len);
		aead_gcm_aad_fill(gaad, sa->spi, sqc, IS_ESN(sa));
	}
		break;
	case ALGO_TYPE_AES_CCM:
	if (sa->aad_len != 0) {
		caad = (struct aead_ccm_aad *)(icv->va + sa->icv_len);
		aead_ccm_aad_fill(caad, sa->spi, sqc, IS_ESN(sa));
	}
		break;
	case ALGO_TYPE_CHACHA20_POLY1305:
	if (sa->aad_len != 0) {
		chacha20_poly1305_aad =	(struct aead_chacha20_poly1305_aad *)
			(icv->va + sa->icv_len);
		aead_chacha20_poly1305_aad_fill(chacha20_poly1305_aad,
			sa->spi, sqc, IS_ESN(sa));
	}
		break;
	default:
		break;
	}
}

/*
 * setup/update packets and crypto ops for ESP outbound tunnel case.