[v2,19/24] lpm: add dummy vector implementation for LoongArch

diff --git a/app/test/test_xmmt_ops.h b/app/test/test_xmmt_ops.h
index 3a82d5ecac..7b2c3c37dd 100644
--- a/app/test/test_xmmt_ops.h
+++ b/app/test/test_xmmt_ops.h
@@ -49,6 +49,23 @@  vect_set_epi32(int i3, int i2, int i1, int i0)
 	return data;
 }
 
+#elif defined(RTE_ARCH_LOONGARCH)
+/* loads the xmm_t value from address p(does not need to be 16-byte aligned)*/
+static __rte_always_inline xmm_t
+vect_loadu_sil128(void *p)
+{
+	xmm_t data;
+	data = *(const xmm_t *)p;
+	return data;
+}
+
+/* sets the 4 signed 32-bit integer values and returns the xmm_t variable */
+static __rte_always_inline xmm_t
+vect_set_epi32(int i3, int i2, int i1, int i0)
+{
+	xmm_t data = (xmm_t){.u32 = {i0, i1, i2, i3} };
+	return data;
+}
 #endif
 
 #endif /* _TEST_XMMT_OPS_H_ */
diff --git a/lib/lpm/meson.build b/lib/lpm/meson.build
index 78d91d3421..66df44b9b4 100644
--- a/lib/lpm/meson.build
+++ b/lib/lpm/meson.build
@@ -16,6 +16,7 @@  indirect_headers += files(
         'rte_lpm_neon.h',
         'rte_lpm_sse.h',
         'rte_lpm_sve.h',
+        'rte_lpm_lsx.h',
 )
 deps += ['hash']
 deps += ['rcu']
diff --git a/lib/lpm/rte_lpm.h b/lib/lpm/rte_lpm.h
index eb91960e81..7e94821212 100644
--- a/lib/lpm/rte_lpm.h
+++ b/lib/lpm/rte_lpm.h
@@ -405,6 +405,8 @@  rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
 #endif
 #elif defined(RTE_ARCH_PPC_64)
 #include "rte_lpm_altivec.h"
+#elif defined(RTE_ARCH_LOONGARCH)
+#include "rte_lpm_lsx.h"
 #else
 #include "rte_lpm_sse.h"
 #endif
diff --git a/lib/lpm/rte_lpm_lsx.h b/lib/lpm/rte_lpm_lsx.h
new file mode 100644
index 0000000000..07942571e7
--- /dev/null
+++ b/lib/lpm/rte_lpm_lsx.h
@@ -0,0 +1,129 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Loongson Technology Corporation Limited
+ */
+
+#ifndef _RTE_LPM_LSX_H_
+#define _RTE_LPM_LSX_H_
+
+#include <rte_branch_prediction.h>
+#include <rte_byteorder.h>
+#include <rte_common.h>
+#include <rte_vect.h>
+#include <rte_lpm.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef RTE_ARCH_NO_VECTOR
+static inline void
+rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
+	uint32_t defv)
+{
+	xmm_t i24;
+	rte_xmm_t i8;
+	uint32_t tbl[4];
+	uint64_t idx, pt, pt2;
+	const uint32_t *ptbl;
+	int i;
+
+	const uint32_t mask = UINT8_MAX;
+	xmm_t mask8_tmp = (xmm_t){.u32 = {mask, mask, mask, mask} };
+
+	const xmm_t mask8 = mask8_tmp;
+
+	/*
+	 * RTE_LPM_VALID_EXT_ENTRY_BITMASK for 2 LPM entries
+	 * as one 64-bit value (0x0300000003000000).
+	 */
+	const uint64_t mask_xv =
+		((uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK |
+		(uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK << 32);
+
+	/*
+	 * RTE_LPM_LOOKUP_SUCCESS for 2 LPM entries
+	 * as one 64-bit value (0x0100000001000000).
+	 */
+	const uint64_t mask_v =
+		((uint64_t)RTE_LPM_LOOKUP_SUCCESS |
+		(uint64_t)RTE_LPM_LOOKUP_SUCCESS << 32);
+
+	/* get 4 indexes for tbl24[]. */
+	for (i = 0; i < 4; i++)
+		i24.u32[i] = ip.u32[i] >> CHAR_BIT;
+
+	/* extract values from tbl24[] */
+	idx = i24.i64[0];
+
+	ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
+	tbl[0] = *ptbl;
+	ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
+	tbl[1] = *ptbl;
+
+	idx = i24.i64[1];
+
+	ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
+	tbl[2] = *ptbl;
+	ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
+	tbl[3] = *ptbl;
+
+	/* get 4 indexes for tbl8[]. */
+	for (i = 0; i < 2; i++)
+		i8.x.u64[i] = ip.u64[i] & mask8.u64[i];
+
+	pt = (uint64_t)tbl[0] |
+		(uint64_t)tbl[1] << 32;
+	pt2 = (uint64_t)tbl[2] |
+		(uint64_t)tbl[3] << 32;
+
+	/* search successfully finished for all 4 IP addresses. */
+	if (likely((pt & mask_xv) == mask_v) &&
+			likely((pt2 & mask_xv) == mask_v)) {
+		*(uint64_t *)hop = pt & RTE_LPM_MASKX4_RES;
+		*(uint64_t *)(hop + 2) = pt2 & RTE_LPM_MASKX4_RES;
+		return;
+	}
+
+	if (unlikely((pt & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
+			RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
+		i8.u32[0] = i8.u32[0] +
+			(tbl[0] & 0x00FFFFFF) * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
+		ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[0]];
+		tbl[0] = *ptbl;
+	}
+	if (unlikely((pt >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
+			RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
+		i8.u32[1] = i8.u32[1] +
+			(tbl[1] & 0x00FFFFFF) * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
+		ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[1]];
+		tbl[1] = *ptbl;
+	}
+	if (unlikely((pt2 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
+			RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
+		i8.u32[2] = i8.u32[2] +
+			(tbl[2] & 0x00FFFFFF) * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
+		ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[2]];
+		tbl[2] = *ptbl;
+	}
+	if (unlikely((pt2 >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
+			RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
+		i8.u32[3] = i8.u32[3] +
+			(tbl[3] & 0x00FFFFFF) * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
+		ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[3]];
+		tbl[3] = *ptbl;
+	}
+
+	hop[0] = (tbl[0] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[0] & 0x00FFFFFF : defv;
+	hop[1] = (tbl[1] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[1] & 0x00FFFFFF : defv;
+	hop[2] = (tbl[2] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[2] & 0x00FFFFFF : defv;
+	hop[3] = (tbl[3] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[3] & 0x00FFFFFF : defv;
+}
+#else
+#error "The current version of LoongArch does not support vector!"
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_LPM_LSX_H_ */