67b68824a8
Added new path to do lpm4 lookup by using scalable vector extension. The SVE path will be selected if compiler has flag SVE set. Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com> Acked-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2020 Arm Limited
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*/
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#ifndef _RTE_LPM_SVE_H_
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#define _RTE_LPM_SVE_H_
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#include <rte_vect.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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__rte_internal
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static void
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__rte_lpm_lookup_vec(const struct rte_lpm *lpm, const uint32_t *ips,
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uint32_t *__rte_restrict next_hops, const uint32_t n)
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{
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uint32_t i = 0;
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svuint32_t v_ip, v_idx, v_tbl24, v_tbl8, v_hop;
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svuint32_t v_mask_xv, v_mask_v, v_mask_hop;
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svbool_t pg = svwhilelt_b32(i, n);
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svbool_t pv;
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do {
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v_ip = svld1(pg, &ips[i]);
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/* Get indices for tbl24[] */
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v_idx = svlsr_x(pg, v_ip, 8);
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/* Extract values from tbl24[] */
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v_tbl24 = svld1_gather_index(pg, (const uint32_t *)lpm->tbl24,
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v_idx);
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/* Create mask with valid set */
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v_mask_v = svdup_u32_z(pg, RTE_LPM_LOOKUP_SUCCESS);
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/* Create mask with valid and valid_group set */
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v_mask_xv = svdup_u32_z(pg, RTE_LPM_VALID_EXT_ENTRY_BITMASK);
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/* Create predicate for tbl24 entries: (valid && !valid_group) */
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pv = svcmpeq(pg, svand_z(pg, v_tbl24, v_mask_xv), v_mask_v);
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/* Create mask for next_hop in table entry */
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v_mask_hop = svdup_u32_z(pg, 0x00ffffff);
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/* Extract next_hop and write back */
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v_hop = svand_x(pv, v_tbl24, v_mask_hop);
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svst1(pv, &next_hops[i], v_hop);
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/* Update predicate for tbl24 entries: (valid && valid_group) */
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pv = svcmpeq(pg, svand_z(pg, v_tbl24, v_mask_xv), v_mask_xv);
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/* Compute tbl8 index */
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v_idx = svand_x(pv, v_tbl24, svdup_u32_z(pv, 0xffffff));
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v_idx = svmul_x(pv, v_idx, RTE_LPM_TBL8_GROUP_NUM_ENTRIES);
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v_idx = svadd_x(pv, svand_x(pv, v_ip, svdup_u32_z(pv, 0xff)),
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v_idx);
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/* Extract values from tbl8[] */
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v_tbl8 = svld1_gather_index(pv, (const uint32_t *)lpm->tbl8,
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v_idx);
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/* Update predicate for tbl8 entries: (valid) */
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pv = svcmpeq(pv, svand_z(pv, v_tbl8, v_mask_v), v_mask_v);
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/* Extract next_hop and write back */
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v_hop = svand_x(pv, v_tbl8, v_mask_hop);
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svst1(pv, &next_hops[i], v_hop);
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i += svlen(v_ip);
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pg = svwhilelt_b32(i, n);
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} while (svptest_any(svptrue_b32(), pg));
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}
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static inline void
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rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
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uint32_t defv)
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{
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uint32_t i, ips[4];
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vst1q_s32((int32_t *)ips, ip);
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for (i = 0; i < 4; i++)
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hop[i] = defv;
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__rte_lpm_lookup_vec(lpm, ips, hop, 4);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RTE_LPM_SVE_H_ */
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