memif: fix the spinlock and unlock issue. - vpp

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author	fangtong <fangtong2007@163.com>	2021-06-05 21:45:36 +0800
committer	Damjan Marion <dmarion@me.com>	2021-06-10 15:13:39 +0000
commit	dc9215903809f74bd27cef332a18858711f928a0 (patch)
tree	2bb7f01ca7613c5be825cae83c586f599e49ffbe /src/svm/fifo_segment.c
parent	07d04f7b03077d1b6e93d9a430fedd31bd858023 (diff)

memif: fix the spinlock and unlock issue.

when the configuration of tx queues is larger than the worker-threads, the clib_spinlock_lock_if_init will not be executed, and then this function will executed the clib_spinlock_unlock_if_init, so this may caused the issue. Type: fix Signed-off-by: fangtong <fangtong2007@163.com> Change-Id: I3ce244cd5e1f410e9f14bd060b929238f069b9fa

Diffstat (limited to 'src/svm/fifo_segment.c')

0 files changed, 0 insertions, 0 deletions

/* * Copyright (c) 2015 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef included_clib_h #define included_clib_h #include <stddef.h> #if __has_include(<vppinfra/config.h>) #include <vppinfra/config.h> #endif #ifdef __x86_64__ #include <x86intrin.h> #endif /* Standalone means to not assume we are running on a Unix box. */ #if ! defined (CLIB_STANDALONE) && ! defined (CLIB_LINUX_KERNEL) #define CLIB_UNIX #endif #include <vppinfra/types.h> #include <vppinfra/atomics.h> /* Global DEBUG flag. Setting this to 1 or 0 turns off ASSERT (see vppinfra/error.h) & other debugging code. */ #ifndef CLIB_DEBUG #define CLIB_DEBUG 0 #endif #ifndef NULL #define NULL ((void *) 0) #endif #define BITS(x) (8*sizeof(x)) #define ARRAY_LEN(x) (sizeof (x)/sizeof (x[0])) #define _STRUCT_FIELD(t,f) (((t *) 0)->f) #define STRUCT_OFFSET_OF(t,f) offsetof(t, f) #define STRUCT_BIT_OFFSET_OF(t,f) (BITS(u8) * STRUCT_OFFSET_OF (t, f)) #define STRUCT_SIZE_OF(t,f) (sizeof (_STRUCT_FIELD (t, f))) #define STRUCT_BITS_OF(t,f) (BITS (_STRUCT_FIELD (t, f))) #define STRUCT_ARRAY_LEN(t,f) ARRAY_LEN (_STRUCT_FIELD (t, f)) #define STRUCT_MARK(mark) u8 mark[0] #define STRUCT_MARK_PTR(v, f) &(v)->f /* Stride in bytes between struct array elements. */ #define STRUCT_STRIDE_OF(t,f) \ ( ((uword) & (((t *) 0)[1].f)) \ - ((uword) & (((t *) 0)[0].f))) #define STRUCT_OFFSET_OF_VAR(v,f) ((uword) (&(v)->f) - (uword) (v)) /* Used to pack structure elements. */ #define CLIB_PACKED(x) x __attribute__ ((packed)) #define CLIB_UNUSED(x) x __attribute__ ((unused)) /* similar to CLIB_CACHE_LINE_ALIGN_MARK() but with arbitrary alignment */ #define CLIB_ALIGN_MARK(name, alignment) u8 name[0] __attribute__((aligned(alignment))) /* Make a string from the macro's argument */ #define CLIB_STRING_MACRO(x) #x #define __clib_unused __attribute__ ((unused)) #define __clib_weak __attribute__ ((weak)) #define __clib_packed __attribute__ ((packed)) #define __clib_constructor __attribute__ ((constructor)) #define __clib_noinline __attribute__ ((noinline)) #define __clib_noclone __attribute__ ((noclone)) #define __clib_aligned(x) __attribute__ ((aligned(x))) #define __clib_section(s) __attribute__ ((section(s))) #define __clib_warn_unused_result __attribute__ ((warn_unused_result)) #define __clib_export __attribute__ ((visibility("default"))) #define never_inline __attribute__ ((__noinline__)) #if CLIB_DEBUG > 0 #define always_inline static inline #define static_always_inline static inline #else #define always_inline static inline __attribute__ ((__always_inline__)) #define static_always_inline static inline __attribute__ ((__always_inline__)) #endif /* Reserved (unused) structure element with address offset between from and to. */ #define CLIB_PAD_FROM_TO(from,to) u8 pad_##from[(to) - (from)] /* Hints to compiler about hot/cold code. */ #define PREDICT_FALSE(x) __builtin_expect((x),0) #define PREDICT_TRUE(x) __builtin_expect((x),1) #define COMPILE_TIME_CONST(x) __builtin_constant_p (x) #define CLIB_ASSUME(x) \ do \ { \ if (!(x)) \ __builtin_unreachable (); \ } \ while (0) /* * Compiler barrier * prevent compiler to reorder memory access across this boundary * prevent compiler to cache values in register (force reload) * Not to be confused with CPU memory barrier below */ #define CLIB_COMPILER_BARRIER() asm volatile ("":::"memory") /* Full memory barrier (read and write). */ #define CLIB_MEMORY_BARRIER() __sync_synchronize () #if __x86_64__ #define CLIB_MEMORY_STORE_BARRIER() __builtin_ia32_sfence () #else #define CLIB_MEMORY_STORE_BARRIER() __sync_synchronize () #endif /* Arranges for function to be called before main. */ #define INIT_FUNCTION(decl) \ decl __attribute ((constructor)); \ decl /* Arranges for function to be called before exit. */ #define EXIT_FUNCTION(decl) \ decl __attribute ((destructor)); \ decl /* Use __builtin_clz if available. */ #if uword_bits == 64 #define count_leading_zeros(x) __builtin_clzll (x) #define count_trailing_zeros(x) __builtin_ctzll (x) #else #define count_leading_zeros(x) __builtin_clzl (x) #define count_trailing_zeros(x) __builtin_ctzl (x) #endif #if defined (count_leading_zeros) always_inline uword clear_lowest_set_bit (uword x) { #ifdef __BMI2__ return _blsr_u64 (x); #else return x ^ (1ULL << count_trailing_zeros (x)); #endif } always_inline uword min_log2 (uword x) { uword n; n = count_leading_zeros (x); return BITS (uword) - n - 1; } #else always_inline uword min_log2 (uword x) { uword a = x, b = BITS (uword) / 2, c = 0, r = 0; /* Reduce x to 4 bit result. */ #define _ \ { \ c = a >> b; \ if (c) a = c; \ if (c) r += b; \ b /= 2; \ } if (BITS (uword) > 32) _; _; _; _; #undef _ /* Do table lookup on 4 bit partial. */ if (BITS (uword) > 32) { const u64 table = 0x3333333322221104LL; uword t = (table >> (4 * a)) & 0xf; r = t < 4 ? r + t : ~0; } else { const u32 table = 0x22221104; uword t = (a & 8) ? 3 : ((table >> (4 * a)) & 0xf); r = t < 4 ? r + t : ~0; } return r; } #endif always_inline uword max_log2 (uword x) { uword l = min_log2 (x); if (x > ((uword) 1 << l)) l++; return l; } always_inline u64 min_log2_u64 (u64 x) { if (BITS (uword) == 64) return min_log2 (x); else { uword l, y; y = x; l = 0; if (y == 0) { l += 32; x >>= 32; } l += min_log2 (x); return l; } } always_inline uword pow2_mask (uword x) { #ifdef __BMI2__ return _bzhi_u64 (-1ULL, x); #endif return ((uword) 1 << x) - (uword) 1; } always_inline uword max_pow2 (uword x) { word y = (word) 1 << min_log2 (x); if (x > y) y *= 2; return y; } always_inline uword is_pow2 (uword x) { return 0 == (x & (x - 1)); } always_inline uword round_down_pow2 (uword x, uword pow2) { return (x) & ~(pow2 - 1); } always_inline uword round_pow2 (uword x, uword pow2) { return (x + pow2 - 1) & ~(pow2 - 1); } always_inline u64 round_pow2_u64 (u64 x, u64 pow2) { return (x + pow2 - 1) & ~(pow2 - 1); } always_inline uword first_set (uword x) { return x & -x; } always_inline uword log2_first_set (uword x) { uword result; #ifdef count_trailing_zeros result = count_trailing_zeros (x); #else result = min_log2 (first_set (x)); #endif return result; } always_inline f64 flt_round_down (f64 x) { return (int) x; } always_inline word flt_round_nearest (f64 x) { return (word) (x + .5); } always_inline f64 flt_round_to_multiple (f64 x, f64 f) { return f * flt_round_nearest (x / f); } always_inline uword extract_bits (uword x, int start, int count) { #ifdef __BMI__ return _bextr_u64 (x, start, count); #endif return (x >> start) & pow2_mask (count); } #define clib_max(x,y) \ ({ \ __typeof__ (x) _x = (x); \ __typeof__ (y) _y = (y); \ _x > _y ? _x : _y; \ }) #define clib_min(x,y) \ ({ \ __typeof__ (x) _x = (x); \ __typeof__ (y) _y = (y); \ _x < _y ? _x : _y; \ }) #define clib_clamp(x,lo,hi) \ ({ \ __typeof__ (x) _x = (x); \ __typeof__ (lo) _lo = (lo); \ __typeof__ (hi) _hi = (hi); \ _x < _lo ? _lo : (_x > _hi ? _hi : _x); \ }) #define clib_abs(x) \ ({ \ __typeof__ (x) _x = (x); \ _x < 0 ? -_x : _x; \ }) /* Standard standalone-only function declarations. */ #ifndef CLIB_UNIX void clib_standalone_init (void *memory, uword memory_bytes); void qsort (void *base, uword n, uword size, int (*)(const void *, const void *)); #endif /* Stack backtrace. */ uword clib_backtrace (uword * callers, uword max_callers, uword n_frames_to_skip); #include <vppinfra/byte_order.h> #endif /* included_clib_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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