[dpdk-dev] [PATCH v7 2/9] acl: add altivec intrinsics for dpdk acl on ppc_64

[Gowrishankar <gowrishankar.m@linux.vnet.ibm.com>]

From: Gowrishankar Muthukrishnan <gowrishankar.m@linux.vnet.ibm.com>

This patch adds port for ACL library in ppc64le.

Signed-off-by: Gowrishankar Muthukrishnan <gowrishankar.m@linux.vnet.ibm.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Chao Zhu <chaozhu@linux.vnet.ibm.com>
---
 app/test-acl/main.c                         |   4 +
 config/defconfig_ppc_64-power8-linuxapp-gcc |   1 -
 lib/librte_acl/Makefile                     |   2 +
 lib/librte_acl/acl.h                        |   4 +
 lib/librte_acl/acl_run.h                    |   2 +
 lib/librte_acl/acl_run_altivec.c            |  47 ++++
 lib/librte_acl/acl_run_altivec.h            | 329 ++++++++++++++++++++++++++++
 lib/librte_acl/rte_acl.c                    |  13 ++
 lib/librte_acl/rte_acl.h                    |   1 +
 9 files changed, 402 insertions(+), 1 deletion(-)
 create mode 100644 lib/librte_acl/acl_run_altivec.c
 create mode 100644 lib/librte_acl/acl_run_altivec.h

diff --git a/app/test-acl/main.c b/app/test-acl/main.c
index d366981..1b2b176 100644
--- a/app/test-acl/main.c
+++ b/app/test-acl/main.c
@@ -105,6 +105,10 @@ static const struct acl_alg acl_alg[] = {
 		.name = "neon",
 		.alg = RTE_ACL_CLASSIFY_NEON,
 	},
+	{
+		.name = "altivec",
+		.alg = RTE_ACL_CLASSIFY_ALTIVEC,
+	},
 };
 
 static struct {
diff --git a/config/defconfig_ppc_64-power8-linuxapp-gcc b/config/defconfig_ppc_64-power8-linuxapp-gcc
index 9ddf3c5..dede34f 100644
--- a/config/defconfig_ppc_64-power8-linuxapp-gcc
+++ b/config/defconfig_ppc_64-power8-linuxapp-gcc
@@ -57,7 +57,6 @@ CONFIG_RTE_LIBRTE_ENIC_PMD=n
 CONFIG_RTE_LIBRTE_FM10K_PMD=n
 
 # This following libraries are not available on Power. So they're turned off.
-CONFIG_RTE_LIBRTE_ACL=n
 CONFIG_RTE_LIBRTE_SCHED=n
 CONFIG_RTE_LIBRTE_PORT=n
 CONFIG_RTE_LIBRTE_TABLE=n
diff --git a/lib/librte_acl/Makefile b/lib/librte_acl/Makefile
index 9803e9d..d05be66 100644
--- a/lib/librte_acl/Makefile
+++ b/lib/librte_acl/Makefile
@@ -52,6 +52,8 @@ SRCS-$(CONFIG_RTE_LIBRTE_ACL) += acl_run_scalar.c
 ifneq ($(filter y,$(CONFIG_RTE_ARCH_ARM) $(CONFIG_RTE_ARCH_ARM64)),)
 SRCS-$(CONFIG_RTE_LIBRTE_ACL) += acl_run_neon.c
 CFLAGS_acl_run_neon.o += -flax-vector-conversions -Wno-maybe-uninitialized
+else ifeq ($(CONFIG_RTE_ARCH_PPC_64),y)
+SRCS-$(CONFIG_RTE_LIBRTE_ACL) += acl_run_altivec.c
 else
 SRCS-$(CONFIG_RTE_LIBRTE_ACL) += acl_run_sse.c
 #check if flag for SSE4.1 is already on, if not set it up manually
diff --git a/lib/librte_acl/acl.h b/lib/librte_acl/acl.h
index 09d6784..6664a55 100644
--- a/lib/librte_acl/acl.h
+++ b/lib/librte_acl/acl.h
@@ -234,6 +234,10 @@ int
 rte_acl_classify_neon(const struct rte_acl_ctx *ctx, const uint8_t **data,
 	uint32_t *results, uint32_t num, uint32_t categories);
 
+int
+rte_acl_classify_altivec(const struct rte_acl_ctx *ctx, const uint8_t **data,
+	uint32_t *results, uint32_t num, uint32_t categories);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/lib/librte_acl/acl_run.h b/lib/librte_acl/acl_run.h
index b2fc42c..024f393 100644
--- a/lib/librte_acl/acl_run.h
+++ b/lib/librte_acl/acl_run.h
@@ -39,7 +39,9 @@
 
 #define MAX_SEARCHES_AVX16	16
 #define MAX_SEARCHES_SSE8	8
+#define MAX_SEARCHES_ALTIVEC8	8
 #define MAX_SEARCHES_SSE4	4
+#define MAX_SEARCHES_ALTIVEC4	4
 #define MAX_SEARCHES_SCALAR	2
 
 #define GET_NEXT_4BYTES(prm, idx)	\
diff --git a/lib/librte_acl/acl_run_altivec.c b/lib/librte_acl/acl_run_altivec.c
new file mode 100644
index 0000000..3523526
--- /dev/null
+++ b/lib/librte_acl/acl_run_altivec.c
@@ -0,0 +1,47 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright (C) IBM Corporation 2016.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "acl_run_altivec.h"
+
+int
+rte_acl_classify_altivec(const struct rte_acl_ctx *ctx, const uint8_t **data,
+	uint32_t *results, uint32_t num, uint32_t categories)
+{
+	if (likely(num >= MAX_SEARCHES_ALTIVEC8))
+		return search_altivec_8(ctx, data, results, num, categories);
+	else if (num >= MAX_SEARCHES_ALTIVEC4)
+		return search_altivec_4(ctx, data, results, num, categories);
+	else
+		return rte_acl_classify_scalar(ctx, data, results, num,
+			categories);
+}
diff --git a/lib/librte_acl/acl_run_altivec.h b/lib/librte_acl/acl_run_altivec.h
new file mode 100644
index 0000000..7d329bc
--- /dev/null
+++ b/lib/librte_acl/acl_run_altivec.h
@@ -0,0 +1,329 @@
+/*
+ *   BSD LICENSE
+ *
+ *   Copyright (C) IBM Corporation 2016.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of IBM Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "acl_run.h"
+#include "acl_vect.h"
+
+struct _altivec_acl_const {
+	rte_xmm_t xmm_shuffle_input;
+	rte_xmm_t xmm_index_mask;
+	rte_xmm_t xmm_ones_16;
+	rte_xmm_t range_base;
+} altivec_acl_const  __attribute__((aligned(RTE_CACHE_LINE_SIZE))) = {
+	{
+		.u32 = {0x00000000, 0x04040404, 0x08080808, 0x0c0c0c0c}
+	},
+	{
+		.u32 = {RTE_ACL_NODE_INDEX, RTE_ACL_NODE_INDEX,
+		RTE_ACL_NODE_INDEX, RTE_ACL_NODE_INDEX}
+	},
+	{
+		.u16 = {1, 1, 1, 1, 1, 1, 1, 1}
+	},
+	{
+		.u32 = {0xffffff00, 0xffffff04, 0xffffff08, 0xffffff0c}
+	},
+};
+
+/*
+ * Resolve priority for multiple results (altivec version).
+ * This consists comparing the priority of the current traversal with the
+ * running set of results for the packet.
+ * For each result, keep a running array of the result (rule number) and
+ * its priority for each category.
+ */
+static inline void
+resolve_priority_altivec(uint64_t transition, int n,
+	const struct rte_acl_ctx *ctx, struct parms *parms,
+	const struct rte_acl_match_results *p, uint32_t categories)
+{
+	uint32_t x;
+	xmm_t results, priority, results1, priority1;
+	vector bool int selector;
+	xmm_t *saved_results, *saved_priority;
+
+	for (x = 0; x < categories; x += RTE_ACL_RESULTS_MULTIPLIER) {
+
+		saved_results = (xmm_t *)(&parms[n].cmplt->results[x]);
+		saved_priority =
+			(xmm_t *)(&parms[n].cmplt->priority[x]);
+
+		/* get results and priorities for completed trie */
+		results = *(const xmm_t *)&p[transition].results[x];
+		priority = *(const xmm_t *)&p[transition].priority[x];
+
+		/* if this is not the first completed trie */
+		if (parms[n].cmplt->count != ctx->num_tries) {
+
+			/* get running best results and their priorities */
+			results1 = *saved_results;
+			priority1 = *saved_priority;
+
+			/* select results that are highest priority */
+			selector = vec_cmpgt(priority1, priority);
+			results = vec_sel(results, results1, selector);
+			priority = vec_sel(priority, priority1,
+				selector);
+		}
+
+		/* save running best results and their priorities */
+		*saved_results = results;
+		*saved_priority = priority;
+	}
+}
+
+/*
+ * Check for any match in 4 transitions
+ */
+static inline __attribute__((always_inline)) uint32_t
+check_any_match_x4(uint64_t val[])
+{
+	return (val[0] | val[1] | val[2] | val[3]) & RTE_ACL_NODE_MATCH;
+}
+
+static inline __attribute__((always_inline)) void
+acl_match_check_x4(int slot, const struct rte_acl_ctx *ctx, struct parms *parms,
+	struct acl_flow_data *flows, uint64_t transitions[])
+{
+	while (check_any_match_x4(transitions)) {
+		transitions[0] = acl_match_check(transitions[0], slot, ctx,
+			parms, flows, resolve_priority_altivec);
+		transitions[1] = acl_match_check(transitions[1], slot + 1, ctx,
+			parms, flows, resolve_priority_altivec);
+		transitions[2] = acl_match_check(transitions[2], slot + 2, ctx,
+			parms, flows, resolve_priority_altivec);
+		transitions[3] = acl_match_check(transitions[3], slot + 3, ctx,
+			parms, flows, resolve_priority_altivec);
+	}
+}
+
+/*
+ * Process 4 transitions (in 2 XMM registers) in parallel
+ */
+static inline __attribute__((optimize("O2"))) xmm_t
+transition4(xmm_t next_input, const uint64_t *trans,
+	xmm_t *indices1, xmm_t *indices2)
+{
+	xmm_t addr, tr_lo, tr_hi;
+	xmm_t in, node_type, r, t;
+	xmm_t dfa_ofs, quad_ofs;
+	xmm_t *index_mask, *tp;
+	vector bool int dfa_msk;
+	vector signed char zeroes = {};
+	union {
+		uint64_t d64[2];
+		uint32_t d32[4];
+	} v;
+
+	/* Move low 32 into tr_lo and high 32 into tr_hi */
+	tr_lo = (xmm_t){(*indices1)[0], (*indices1)[2],
+			(*indices2)[0], (*indices2)[2]};
+	tr_hi = (xmm_t){(*indices1)[1], (*indices1)[3],
+			(*indices2)[1], (*indices2)[3]};
+
+	 /* Calculate the address (array index) for all 4 transitions. */
+	index_mask = (xmm_t *)&altivec_acl_const.xmm_index_mask.u32;
+	t = vec_xor(*index_mask, *index_mask);
+	in = vec_perm(next_input, (xmm_t){},
+		*(vector unsigned char *)&altivec_acl_const.xmm_shuffle_input);
+
+	/* Calc node type and node addr */
+	node_type = vec_and(vec_nor(*index_mask, *index_mask), tr_lo);
+	addr = vec_and(tr_lo, *index_mask);
+
+	/* mask for DFA type(0) nodes */
+	dfa_msk = vec_cmpeq(node_type, t);
+
+	/* DFA calculations. */
+	r = vec_sr(in, (vector unsigned int){30, 30, 30, 30});
+	tp = (xmm_t *)&altivec_acl_const.range_base.u32;
+	r = vec_add(r, *tp);
+	t = vec_sr(in, (vector unsigned int){24, 24, 24, 24});
+	r = vec_perm(tr_hi, (xmm_t){(uint16_t)0 << 16},
+		(vector unsigned char)r);
+
+	dfa_ofs = vec_sub(t, r);
+
+	/* QUAD/SINGLE caluclations. */
+	t = (xmm_t)vec_cmpgt((vector signed char)in, (vector signed char)tr_hi);
+	t = (xmm_t)vec_sel(
+		vec_sel(
+			(vector signed char)vec_sub(
+				zeroes, (vector signed char)t),
+			(vector signed char)t,
+			vec_cmpgt((vector signed char)t, zeroes)),
+		zeroes,
+		vec_cmpeq((vector signed char)t, zeroes));
+
+	t = (xmm_t)vec_msum((vector signed char)t,
+		(vector unsigned char)t, (xmm_t){});
+	quad_ofs = (xmm_t)vec_msum((vector signed short)t,
+		*(vector signed short *)&altivec_acl_const.xmm_ones_16.u16,
+		(xmm_t){});
+
+	/* blend DFA and QUAD/SINGLE. */
+	t = vec_sel(quad_ofs, dfa_ofs, dfa_msk);
+
+	/* calculate address for next transitions. */
+	addr = vec_add(addr, t);
+
+	v.d64[0] = (uint64_t)trans[addr[0]];
+	v.d64[1] = (uint64_t)trans[addr[1]];
+	*indices1 = (xmm_t){v.d32[0], v.d32[1], v.d32[2], v.d32[3]};
+	v.d64[0] = (uint64_t)trans[addr[2]];
+	v.d64[1] = (uint64_t)trans[addr[3]];
+	*indices2 = (xmm_t){v.d32[0], v.d32[1], v.d32[2], v.d32[3]};
+
+	return vec_sr(next_input,
+		(vector unsigned int){CHAR_BIT, CHAR_BIT, CHAR_BIT, CHAR_BIT});
+}
+
+/*
+ * Execute trie traversal with 8 traversals in parallel
+ */
+static inline int
+search_altivec_8(const struct rte_acl_ctx *ctx, const uint8_t **data,
+	uint32_t *results, uint32_t total_packets, uint32_t categories)
+{
+	int n;
+	struct acl_flow_data flows;
+	uint64_t index_array[MAX_SEARCHES_ALTIVEC8];
+	struct completion cmplt[MAX_SEARCHES_ALTIVEC8];
+	struct parms parms[MAX_SEARCHES_ALTIVEC8];
+	xmm_t input0, input1;
+
+	acl_set_flow(&flows, cmplt, RTE_DIM(cmplt), data, results,
+		total_packets, categories, ctx->trans_table);
+
+	for (n = 0; n < MAX_SEARCHES_ALTIVEC8; n++) {
+		cmplt[n].count = 0;
+		index_array[n] = acl_start_next_trie(&flows, parms, n, ctx);
+	}
+
+	 /* Check for any matches. */
+	acl_match_check_x4(0, ctx, parms, &flows, (uint64_t *)&index_array[0]);
+	acl_match_check_x4(4, ctx, parms, &flows, (uint64_t *)&index_array[4]);
+
+	while (flows.started > 0) {
+
+		/* Gather 4 bytes of input data for each stream. */
+		input0 = (xmm_t){GET_NEXT_4BYTES(parms, 0),
+				GET_NEXT_4BYTES(parms, 1),
+				GET_NEXT_4BYTES(parms, 2),
+				GET_NEXT_4BYTES(parms, 3)};
+
+		input1 = (xmm_t){GET_NEXT_4BYTES(parms, 4),
+				GET_NEXT_4BYTES(parms, 5),
+				GET_NEXT_4BYTES(parms, 6),
+				GET_NEXT_4BYTES(parms, 7)};
+
+		 /* Process the 4 bytes of input on each stream. */
+
+		input0 = transition4(input0, flows.trans,
+			(xmm_t *)&index_array[0], (xmm_t *)&index_array[2]);
+		input1 = transition4(input1, flows.trans,
+			(xmm_t *)&index_array[4], (xmm_t *)&index_array[6]);
+
+		input0 = transition4(input0, flows.trans,
+			(xmm_t *)&index_array[0], (xmm_t *)&index_array[2]);
+		input1 = transition4(input1, flows.trans,
+			(xmm_t *)&index_array[4], (xmm_t *)&index_array[6]);
+
+		input0 = transition4(input0, flows.trans,
+			(xmm_t *)&index_array[0], (xmm_t *)&index_array[2]);
+		input1 = transition4(input1, flows.trans,
+			(xmm_t *)&index_array[4], (xmm_t *)&index_array[6]);
+
+		input0 = transition4(input0, flows.trans,
+			(xmm_t *)&index_array[0], (xmm_t *)&index_array[2]);
+		input1 = transition4(input1, flows.trans,
+			(xmm_t *)&index_array[4], (xmm_t *)&index_array[6]);
+
+		 /* Check for any matches. */
+		acl_match_check_x4(0, ctx, parms, &flows,
+			(uint64_t *)&index_array[0]);
+		acl_match_check_x4(4, ctx, parms, &flows,
+			(uint64_t *)&index_array[4]);
+	}
+
+	return 0;
+}
+
+/*
+ * Execute trie traversal with 4 traversals in parallel
+ */
+static inline int
+search_altivec_4(const struct rte_acl_ctx *ctx, const uint8_t **data,
+	 uint32_t *results, int total_packets, uint32_t categories)
+{
+	int n;
+	struct acl_flow_data flows;
+	uint64_t index_array[MAX_SEARCHES_ALTIVEC4];
+	struct completion cmplt[MAX_SEARCHES_ALTIVEC4];
+	struct parms parms[MAX_SEARCHES_ALTIVEC4];
+	xmm_t input;
+
+	acl_set_flow(&flows, cmplt, RTE_DIM(cmplt), data, results,
+		total_packets, categories, ctx->trans_table);
+
+	for (n = 0; n < MAX_SEARCHES_ALTIVEC4; n++) {
+		cmplt[n].count = 0;
+		index_array[n] = acl_start_next_trie(&flows, parms, n, ctx);
+	}
+
+	/* Check for any matches. */
+	acl_match_check_x4(0, ctx, parms, &flows, index_array);
+
+	while (flows.started > 0) {
+
+		/* Gather 4 bytes of input data for each stream. */
+		input = (xmm_t){GET_NEXT_4BYTES(parms, 0),
+				GET_NEXT_4BYTES(parms, 1),
+				GET_NEXT_4BYTES(parms, 2),
+				GET_NEXT_4BYTES(parms, 3)};
+
+		/* Process the 4 bytes of input on each stream. */
+		input = transition4(input, flows.trans,
+			(xmm_t *)&index_array[0], (xmm_t *)&index_array[2]);
+		input = transition4(input, flows.trans,
+			(xmm_t *)&index_array[0], (xmm_t *)&index_array[2]);
+		input = transition4(input, flows.trans,
+			(xmm_t *)&index_array[0], (xmm_t *)&index_array[2]);
+		input = transition4(input, flows.trans,
+			(xmm_t *)&index_array[0], (xmm_t *)&index_array[2]);
+
+		/* Check for any matches. */
+		acl_match_check_x4(0, ctx, parms, &flows, index_array);
+	}
+
+	return 0;
+}
diff --git a/lib/librte_acl/rte_acl.c b/lib/librte_acl/rte_acl.c
index 4ba9786..8b7e92c 100644
--- a/lib/librte_acl/rte_acl.c
+++ b/lib/librte_acl/rte_acl.c
@@ -75,12 +75,23 @@ rte_acl_classify_neon(__rte_unused const struct rte_acl_ctx *ctx,
 	return -ENOTSUP;
 }
 
+int __attribute__ ((weak))
+rte_acl_classify_altivec(__rte_unused const struct rte_acl_ctx *ctx,
+	__rte_unused const uint8_t **data,
+	__rte_unused uint32_t *results,
+	__rte_unused uint32_t num,
+	__rte_unused uint32_t categories)
+{
+	return -ENOTSUP;
+}
+
 static const rte_acl_classify_t classify_fns[] = {
 	[RTE_ACL_CLASSIFY_DEFAULT] = rte_acl_classify_scalar,
 	[RTE_ACL_CLASSIFY_SCALAR] = rte_acl_classify_scalar,
 	[RTE_ACL_CLASSIFY_SSE] = rte_acl_classify_sse,
 	[RTE_ACL_CLASSIFY_AVX2] = rte_acl_classify_avx2,
 	[RTE_ACL_CLASSIFY_NEON] = rte_acl_classify_neon,
+	[RTE_ACL_CLASSIFY_ALTIVEC] = rte_acl_classify_altivec,
 };
 
 /* by default, use always available scalar code path. */
@@ -119,6 +130,8 @@ rte_acl_init(void)
 #elif defined(RTE_ARCH_ARM)
 	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))
 		alg =  RTE_ACL_CLASSIFY_NEON;
+#elif defined(RTE_ARCH_PPC_64)
+	alg = RTE_ACL_CLASSIFY_ALTIVEC;
 #else
 #ifdef CC_AVX2_SUPPORT
 	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2))
diff --git a/lib/librte_acl/rte_acl.h b/lib/librte_acl/rte_acl.h
index 0979a09..8d4e2a6 100644
--- a/lib/librte_acl/rte_acl.h
+++ b/lib/librte_acl/rte_acl.h
@@ -271,6 +271,7 @@ enum rte_acl_classify_alg {
 	RTE_ACL_CLASSIFY_SSE = 2,     /**< requires SSE4.1 support. */
 	RTE_ACL_CLASSIFY_AVX2 = 3,    /**< requires AVX2 support. */
 	RTE_ACL_CLASSIFY_NEON = 4,    /**< requires NEON support. */
+	RTE_ACL_CLASSIFY_ALTIVEC = 5,    /**< requires ALTIVEC support. */
 	RTE_ACL_CLASSIFY_NUM          /* should always be the last one. */
 };
 
-- 
1.9.1