mirror of
https://github.com/VectorCamp/vectorscan.git
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Feature/refactor fdr (#251)
* remove the use of macros for critical loops, easier to debug removed switch, merged get_conf_stride functions into 1 * remove the use of macros for critical loops, easier to debug removed switch, merged get_conf_stride functions into 1 split FDR implementations into arch specific files (same for now)
This commit is contained in:
Konstantinos Margaritis
committed by
GitHub
GitHub
parent
eaa8f91c95
commit
87d8b357a9
370
src/fdr/fdr.c
370
src/fdr/fdr.c
@@ -1,5 +1,6 @@
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/*
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* Copyright (c) 2015-2017, Intel Corporation
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* Copyright (c) 2020-2025, VectorCamp PC
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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@@ -31,6 +32,7 @@
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#include "fdr_confirm_runtime.h"
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#include "fdr_internal.h"
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#include "fdr_loadval.h"
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#include "fdr_impl.h"
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#include "flood_runtime.h"
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#include "scratch.h"
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#include "teddy.h"
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@@ -40,86 +42,6 @@
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#include "util/simd_utils.h"
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#include "util/uniform_ops.h"
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/** \brief number of bytes processed in each iteration */
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#define ITER_BYTES 16
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/** \brief total zone buffer size */
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#define ZONE_TOTAL_SIZE 64
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/** \brief maximum number of allowed zones */
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#define ZONE_MAX 3
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/** \brief zone information.
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*
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* Zone represents a region of data to scan in FDR.
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*
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* The incoming buffer is to split in multiple zones to ensure two properties:
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* 1: that we can read 8? bytes behind to generate a hash safely
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* 2: that we can read the 3 byte after the current byte (domain > 8)
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*/
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struct zone {
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/** \brief copied buffer, used only when it is a boundary zone. */
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u8 ALIGN_CL_DIRECTIVE buf[ZONE_TOTAL_SIZE];
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/** \brief shift amount for fdr state to avoid unwanted match. */
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u8 shift;
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/** \brief if boundary zone, start points into the zone buffer after the
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* pre-padding. Otherwise, points to the main buffer, appropriately. */
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const u8 *start;
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/** \brief if boundary zone, end points to the end of zone. Otherwise,
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* pointer to the main buffer, appropriately. */
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const u8 *end;
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/** \brief the amount to adjust to go from a pointer in the zones region
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* (between start and end) to a pointer in the original data buffer. */
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ptrdiff_t zone_pointer_adjust;
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/** \brief firstFloodDetect from FDR_Runtime_Args for non-boundary zones,
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* otherwise end of the zone buf. floodPtr always points inside the same
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* buffer as the start pointe. */
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const u8 *floodPtr;
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};
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static
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const ALIGN_CL_DIRECTIVE u8 zone_or_mask[ITER_BYTES+1][ITER_BYTES] = {
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 },
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
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};
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/* generates an initial state mask based on the last byte-ish of history rather
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* than being all accepting. If there is no history to consider, the state is
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* generated based on the minimum length of each bucket in order to prevent
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@@ -141,197 +63,6 @@ m128 getInitState(const struct FDR *fdr, u8 len_history, const u64a *ft,
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return s;
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}
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static really_inline
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void get_conf_stride_1(const u8 *itPtr, UNUSED const u8 *start_ptr,
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UNUSED const u8 *end_ptr, u32 domain_mask_flipped,
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const u64a *ft, u64a *conf0, u64a *conf8, m128 *s) {
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/* +1: the zones ensure that we can read the byte at z->end */
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assert(itPtr >= start_ptr && itPtr + ITER_BYTES <= end_ptr);
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u64a domain_mask = ~domain_mask_flipped;
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u64a it_hi = *(const u64a *)itPtr;
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u64a it_lo = *(const u64a *)(itPtr + 8);
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u64a reach0 = domain_mask & it_hi;
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u64a reach1 = domain_mask & (it_hi >> 8);
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u64a reach2 = domain_mask & (it_hi >> 16);
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u64a reach3 = domain_mask & (it_hi >> 24);
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u64a reach4 = domain_mask & (it_hi >> 32);
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u64a reach5 = domain_mask & (it_hi >> 40);
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u64a reach6 = domain_mask & (it_hi >> 48);
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u64a reach7 = domain_mask & ((it_hi >> 56) | (it_lo << 8));
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u64a reach8 = domain_mask & it_lo;
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u64a reach9 = domain_mask & (it_lo >> 8);
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u64a reach10 = domain_mask & (it_lo >> 16);
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u64a reach11 = domain_mask & (it_lo >> 24);
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u64a reach12 = domain_mask & (it_lo >> 32);
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u64a reach13 = domain_mask & (it_lo >> 40);
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u64a reach14 = domain_mask & (it_lo >> 48);
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u64a reach15 = domain_mask & unaligned_load_u32(itPtr + 15);
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m128 st0 = load_m128_from_u64a(ft + reach0);
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m128 st1 = lshiftbyte_m128(load_m128_from_u64a(ft + reach1), 1);
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m128 st2 = lshiftbyte_m128(load_m128_from_u64a(ft + reach2), 2);
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m128 st3 = lshiftbyte_m128(load_m128_from_u64a(ft + reach3), 3);
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m128 st4 = lshiftbyte_m128(load_m128_from_u64a(ft + reach4), 4);
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m128 st5 = lshiftbyte_m128(load_m128_from_u64a(ft + reach5), 5);
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m128 st6 = lshiftbyte_m128(load_m128_from_u64a(ft + reach6), 6);
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m128 st7 = lshiftbyte_m128(load_m128_from_u64a(ft + reach7), 7);
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m128 st8 = load_m128_from_u64a(ft + reach8);
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m128 st9 = lshiftbyte_m128(load_m128_from_u64a(ft + reach9), 1);
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m128 st10 = lshiftbyte_m128(load_m128_from_u64a(ft + reach10), 2);
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m128 st11 = lshiftbyte_m128(load_m128_from_u64a(ft + reach11), 3);
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m128 st12 = lshiftbyte_m128(load_m128_from_u64a(ft + reach12), 4);
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m128 st13 = lshiftbyte_m128(load_m128_from_u64a(ft + reach13), 5);
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m128 st14 = lshiftbyte_m128(load_m128_from_u64a(ft + reach14), 6);
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m128 st15 = lshiftbyte_m128(load_m128_from_u64a(ft + reach15), 7);
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st0 = or128(st0, st1);
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st2 = or128(st2, st3);
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st4 = or128(st4, st5);
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st6 = or128(st6, st7);
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st0 = or128(st0, st2);
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st4 = or128(st4, st6);
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st0 = or128(st0, st4);
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st8 = or128(st8, st9);
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st10 = or128(st10, st11);
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st12 = or128(st12, st13);
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st14 = or128(st14, st15);
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st8 = or128(st8, st10);
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st12 = or128(st12, st14);
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st8 = or128(st8, st12);
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m128 st = or128(*s, st0);
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*conf0 = movq(st) ^ ~0ULL;
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st = rshiftbyte_m128(st, 8);
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st = or128(st, st8);
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*conf8 = movq(st) ^ ~0ULL;
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*s = rshiftbyte_m128(st, 8);
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}
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static really_inline
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void get_conf_stride_2(const u8 *itPtr, UNUSED const u8 *start_ptr,
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UNUSED const u8 *end_ptr, u32 domain_mask_flipped,
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const u64a *ft, u64a *conf0, u64a *conf8, m128 *s) {
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assert(itPtr >= start_ptr && itPtr + ITER_BYTES <= end_ptr);
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u64a reach0 = andn(domain_mask_flipped, itPtr);
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u64a reach2 = andn(domain_mask_flipped, itPtr + 2);
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u64a reach4 = andn(domain_mask_flipped, itPtr + 4);
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u64a reach6 = andn(domain_mask_flipped, itPtr + 6);
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m128 st0 = load_m128_from_u64a(ft + reach0);
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m128 st2 = load_m128_from_u64a(ft + reach2);
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m128 st4 = load_m128_from_u64a(ft + reach4);
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m128 st6 = load_m128_from_u64a(ft + reach6);
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u64a reach8 = andn(domain_mask_flipped, itPtr + 8);
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u64a reach10 = andn(domain_mask_flipped, itPtr + 10);
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u64a reach12 = andn(domain_mask_flipped, itPtr + 12);
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u64a reach14 = andn(domain_mask_flipped, itPtr + 14);
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m128 st8 = load_m128_from_u64a(ft + reach8);
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m128 st10 = load_m128_from_u64a(ft + reach10);
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m128 st12 = load_m128_from_u64a(ft + reach12);
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m128 st14 = load_m128_from_u64a(ft + reach14);
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st2 = lshiftbyte_m128(st2, 2);
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st4 = lshiftbyte_m128(st4, 4);
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st6 = lshiftbyte_m128(st6, 6);
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*s = or128(*s, st0);
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*s = or128(*s, st2);
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*s = or128(*s, st4);
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*s = or128(*s, st6);
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*conf0 = movq(*s);
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*s = rshiftbyte_m128(*s, 8);
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*conf0 ^= ~0ULL;
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st10 = lshiftbyte_m128(st10, 2);
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st12 = lshiftbyte_m128(st12, 4);
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st14 = lshiftbyte_m128(st14, 6);
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*s = or128(*s, st8);
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*s = or128(*s, st10);
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*s = or128(*s, st12);
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*s = or128(*s, st14);
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*conf8 = movq(*s);
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*s = rshiftbyte_m128(*s, 8);
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*conf8 ^= ~0ULL;
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}
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static really_inline
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void get_conf_stride_4(const u8 *itPtr, UNUSED const u8 *start_ptr,
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UNUSED const u8 *end_ptr, u32 domain_mask_flipped,
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const u64a *ft, u64a *conf0, u64a *conf8, m128 *s) {
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assert(itPtr >= start_ptr && itPtr + ITER_BYTES <= end_ptr);
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u64a reach0 = andn(domain_mask_flipped, itPtr);
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u64a reach4 = andn(domain_mask_flipped, itPtr + 4);
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u64a reach8 = andn(domain_mask_flipped, itPtr + 8);
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u64a reach12 = andn(domain_mask_flipped, itPtr + 12);
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m128 st0 = load_m128_from_u64a(ft + reach0);
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m128 st4 = load_m128_from_u64a(ft + reach4);
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m128 st8 = load_m128_from_u64a(ft + reach8);
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m128 st12 = load_m128_from_u64a(ft + reach12);
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st4 = lshiftbyte_m128(st4, 4);
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st12 = lshiftbyte_m128(st12, 4);
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*s = or128(*s, st0);
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*s = or128(*s, st4);
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*conf0 = movq(*s);
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*s = rshiftbyte_m128(*s, 8);
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*conf0 ^= ~0ULL;
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*s = or128(*s, st8);
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*s = or128(*s, st12);
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*conf8 = movq(*s);
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*s = rshiftbyte_m128(*s, 8);
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*conf8 ^= ~0ULL;
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}
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static really_inline
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void do_confirm_fdr(u64a *conf, u8 offset, hwlmcb_rv_t *control,
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const u32 *confBase, const struct FDR_Runtime_Args *a,
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const u8 *ptr, u32 *last_match_id, const struct zone *z) {
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const u8 bucket = 8;
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if (likely(!*conf)) {
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return;
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}
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/* ptr is currently referring to a location in the zone's buffer, we also
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* need a pointer in the original, main buffer for the final string compare.
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*/
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const u8 *ptr_main = (const u8 *)((uintptr_t)ptr + z->zone_pointer_adjust); //NOLINT (performance-no-int-to-ptr)
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const u8 *confLoc = ptr;
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do {
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u32 bit = findAndClearLSB_64(conf);
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u32 byte = bit / bucket + offset;
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u32 bitRem = bit % bucket;
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u32 idx = bitRem;
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u32 cf = confBase[idx];
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if (!cf) {
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continue;
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}
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const struct FDRConfirm *fdrc = (const struct FDRConfirm *)
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((const u8 *)confBase + cf);
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if (!(fdrc->groups & *control)) {
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continue;
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}
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u64a confVal = unaligned_load_u64a(confLoc + byte - sizeof(u64a) + 1);
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confWithBit(fdrc, a, ptr_main - a->buf + byte, control,
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last_match_id, confVal, conf, bit);
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} while (unlikely(!!*conf));
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}
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static really_inline
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void dumpZoneInfo(UNUSED const struct zone *z, UNUSED size_t zone_id) {
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#ifdef DEBUG
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@@ -660,41 +391,6 @@ size_t prepareZones(const u8 *buf, size_t len, const u8 *hend,
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#define INVALID_MATCH_ID (~0U)
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#define FDR_MAIN_LOOP(zz, s, get_conf_fn) \
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do { \
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const u8 *tryFloodDetect = zz->floodPtr; \
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const u8 *start_ptr = zz->start; \
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const u8 *end_ptr = zz->end; \
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for (const u8 *itPtr = ROUNDDOWN_PTR(start_ptr, 64); itPtr + 4*ITER_BYTES <= end_ptr; \
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itPtr += 4*ITER_BYTES) { \
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__builtin_prefetch(itPtr); \
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} \
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\
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for (const u8 *itPtr = start_ptr; itPtr + ITER_BYTES <= end_ptr; \
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itPtr += ITER_BYTES) { \
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if (unlikely(itPtr > tryFloodDetect)) { \
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tryFloodDetect = floodDetect(fdr, a, &itPtr, tryFloodDetect,\
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&floodBackoff, &control, \
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ITER_BYTES); \
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if (unlikely(control == HWLM_TERMINATE_MATCHING)) { \
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return HWLM_TERMINATED; \
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} \
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} \
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__builtin_prefetch(itPtr + ITER_BYTES); \
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u64a conf0; \
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u64a conf8; \
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get_conf_fn(itPtr, start_ptr, end_ptr, domain_mask_flipped, \
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ft, &conf0, &conf8, &s); \
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do_confirm_fdr(&conf0, 0, &control, confBase, a, itPtr, \
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&last_match_id, zz); \
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do_confirm_fdr(&conf8, 8, &control, confBase, a, itPtr, \
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&last_match_id, zz); \
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if (unlikely(control == HWLM_TERMINATE_MATCHING)) { \
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return HWLM_TERMINATED; \
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} \
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} /* end for loop */ \
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} while (0) \
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static never_inline
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hwlm_error_t fdr_engine_exec(const struct FDR *fdr,
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const struct FDR_Runtime_Args *a,
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@@ -703,8 +399,7 @@ hwlm_error_t fdr_engine_exec(const struct FDR *fdr,
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u32 floodBackoff = FLOOD_BACKOFF_START;
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u32 last_match_id = INVALID_MATCH_ID;
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u32 domain_mask_flipped = ~fdr->domainMask;
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u8 stride = fdr->stride;
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const u64a *ft =
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(const u64a *)((const u8 *)fdr + ROUNDUP_CL(sizeof(struct FDR)));
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assert(ISALIGNED_CL(ft));
|
||||
@@ -722,42 +417,39 @@ hwlm_error_t fdr_engine_exec(const struct FDR *fdr,
|
||||
|
||||
for (size_t curZone = 0; curZone < numZone; curZone++) {
|
||||
struct zone *z = &zones[curZone];
|
||||
dumpZoneInfo(z, curZone);
|
||||
m128 zone_mask = load128(zone_or_mask[z->shift]);
|
||||
|
||||
/* When a zone contains less data than is processed in an iteration
|
||||
* of FDR_MAIN_LOOP(), we need to scan over some extra data.
|
||||
*
|
||||
* We have chosen to scan this extra data at the start of the
|
||||
* iteration. The extra data is either data we have already scanned or
|
||||
* garbage (if it is earlier than offset 0),
|
||||
*
|
||||
* As a result we need to shift the incoming state back so that it will
|
||||
* properly line up with the data being scanned.
|
||||
*
|
||||
* We also need to forbid reporting any matches in the data being
|
||||
* rescanned as they have already been reported (or are over garbage but
|
||||
* later stages should also provide that safety guarantee).
|
||||
*/
|
||||
const u8 *cacheline = ROUNDDOWN_PTR(z->start, 64);
|
||||
__builtin_prefetch(cacheline);
|
||||
|
||||
u8 shift = z->shift;
|
||||
const u8 *tryFloodDetect = z->floodPtr;
|
||||
|
||||
state = variable_byte_shift_m128(state, shift);
|
||||
state = variable_byte_shift_m128(state, z->shift);
|
||||
state = or128(state, zone_mask);
|
||||
|
||||
state = or128(state, load128(zone_or_mask[shift]));
|
||||
for (const u8 *itPtr = z->start; itPtr + ITER_BYTES <= z->end; itPtr += ITER_BYTES) {
|
||||
if (unlikely(itPtr > tryFloodDetect)) {
|
||||
tryFloodDetect = floodDetect(fdr, a, &itPtr, tryFloodDetect,
|
||||
&floodBackoff, &control,
|
||||
ITER_BYTES);
|
||||
if (unlikely(control == HWLM_TERMINATE_MATCHING)) {
|
||||
return HWLM_TERMINATED;
|
||||
}
|
||||
}
|
||||
u64a conf0;
|
||||
u64a conf8;
|
||||
|
||||
switch (stride) {
|
||||
case 1:
|
||||
FDR_MAIN_LOOP(z, state, get_conf_stride_1);
|
||||
break;
|
||||
case 2:
|
||||
FDR_MAIN_LOOP(z, state, get_conf_stride_2);
|
||||
break;
|
||||
case 4:
|
||||
FDR_MAIN_LOOP(z, state, get_conf_stride_4);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
cacheline += 64;
|
||||
__builtin_prefetch(cacheline);
|
||||
|
||||
get_conf_stride(itPtr, z->start, z->end, fdr->domainMask, fdr->stride, ft, &conf0, &conf8, &state);
|
||||
|
||||
do_confirm_fdr(&conf0, 0, &control, confBase, a, itPtr, &last_match_id, z);
|
||||
do_confirm_fdr(&conf8, 8, &control, confBase, a, itPtr, &last_match_id, z);
|
||||
if (unlikely(control == HWLM_TERMINATE_MATCHING)) {
|
||||
return HWLM_TERMINATED;
|
||||
}
|
||||
} /* end for loop */
|
||||
}
|
||||
|
||||
return HWLM_SUCCESS;
|
||||
|
||||
Reference in New Issue
Block a user