mirror of
https://github.com/amadvance/snapraid.git
synced 2026-10-26 10:51:54 -04:00
Remove stream CRC and optimize CRC compute CRC32C using two lanes
This commit is contained in:
Andrea Mazzoleni
parent
581ec4e156
commit
a01ec45f14
7 changed files with 196 additions and 129 deletions
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@ -20,7 +20,6 @@ void test(int advise_mode)
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uint32_t u32 = -1L;
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uint64_t u64 = -1LL;
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uint32_t put_crc_stored;
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uint32_t put_crc_computed;
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crc32c_init();
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@ -79,13 +78,6 @@ void test(int advise_mode)
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}
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put_crc_stored = scrc(s);
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put_crc_computed = scrc_stream(s);
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if (put_crc_stored != put_crc_computed) {
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/* LCOV_EXCL_START */
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exit(EXIT_FAILURE);
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/* LCOV_EXCL_STOP */
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}
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if (sputble32(put_crc_stored, s) != 0) {
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/* LCOV_EXCL_START */
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@ -297,6 +297,33 @@ static void test_crc32c(void)
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/* LCOV_EXCL_STOP */
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}
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}
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{
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unsigned char data[8255 + 7];
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static const size_t size[] = { 4095, 4096, 4097, 5000, 8255 };
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static const unsigned offset[] = { 0, 1, 3, 7 };
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unsigned j;
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unsigned k;
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for (i = 0; i < sizeof(data); ++i)
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data[i] = (unsigned char)(i * 29 + i / 7);
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for (j = 0; j < sizeof(size) / sizeof(size[0]); ++j) {
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for (k = 0; k < sizeof(offset) / sizeof(offset[0]); ++k) {
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uint32_t seed = 0x12345678;
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uint32_t digest = crc32c(seed, data + offset[k], size[j]);
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uint32_t digest_gen = crc32c_gen(seed, data + offset[k], size[j]);
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if (digest != digest_gen) {
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/* LCOV_EXCL_START */
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log_fatal(EINTERNAL, "Failed CRC32C large buffer test\n");
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exit(EXIT_FAILURE);
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/* LCOV_EXCL_STOP */
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}
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}
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}
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}
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}
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static void test_parity(void)
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@ -3855,23 +3855,18 @@ struct state_write_thread_context {
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* Write all hashes in a contiguous run of file blocks.
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*
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* The source hashes are separated by the block state byte, so they cannot be
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* copied with a single memcpy(). Keep the stream pointer and the independent
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* CRC local while filling each buffered group to avoid the per-block stream
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* call and field updates. The CRC is still computed before each hash is copied,
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* preserving the memory-corruption check performed by swrite().
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* copied with a single memcpy(). Keep the stream pointer local while filling
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* each buffered group to avoid the per-block stream call and field updates.
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*/
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static int state_write_block_run(STREAM* f, struct snapraid_file* file, block_off_t file_pos, block_off_t count)
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{
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unsigned char* block_ptr = (unsigned char*)file_block(file, file_pos);
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size_t block_stride = block_sizeof();
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assert(f->flags & STREAM_FLAGS_CRC);
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while (count) {
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size_t available = (size_t)(f->end - f->pos);
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block_off_t cached_count = available / BLOCK_HASH_SIZE;
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unsigned char* output;
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uint32_t crc;
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if (cached_count > count)
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cached_count = count;
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@ -3888,18 +3883,15 @@ static int state_write_block_run(STREAM* f, struct snapraid_file* file, block_of
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}
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output = f->pos;
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crc = f->crc_stream;
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for (block_off_t i = 0; i < cached_count; ++i) {
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struct snapraid_block* block = (struct snapraid_block*)block_ptr;
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crc = crc32c_plain(crc, block->hash, BLOCK_HASH_SIZE);
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hash_copy(output, block->hash);
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output += BLOCK_HASH_SIZE;
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block_ptr += block_stride;
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}
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f->crc_stream = crc;
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f->pos = output;
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count -= cached_count;
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}
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@ -4473,19 +4465,6 @@ static void* state_write_thread(void* arg)
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/* get the file crc */
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crc = scrc(f);
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/*
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* Compare the crc of the data written to file
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* with the one of the data written to the stream
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*/
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if (crc != scrc_stream(f)) {
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/* LCOV_EXCL_START */
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log_fatal(ECONTENT, "CRC mismatch while writing the content stream.\n");
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log_fatal(ECONTENT, "DANGER! Your RAM memory is faulty! DO NOT PROCEED UNTIL FIXED!\n");
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log_fatal(ECONTENT, "Try running a memory test like http://www.memtest86.com/\n");
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goto bail;
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/* LCOV_EXCL_STOP */
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}
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sputble32(crc, f);
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if (serror(f)) {
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/* LCOV_EXCL_START */
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@ -68,7 +68,6 @@ STREAM* sopen_read(const char* file, int flags)
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s->offset_uncached = 0;
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s->crc = 0;
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s->crc_uncached = 0;
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s->crc_stream = CRC_IV;
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return s;
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}
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@ -100,7 +99,6 @@ STREAM* sopen_multi_write(unsigned count, int flags)
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s->offset_uncached = 0;
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s->crc = 0;
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s->crc_uncached = 0;
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s->crc_stream = CRC_IV;
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return s;
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}
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@ -389,12 +387,6 @@ uint32_t scrc(STREAM* s)
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return crc32c(s->crc_uncached, s->buffer, s->pos - s->buffer);
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}
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uint32_t scrc_stream(STREAM* s)
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{
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assert(s->flags & STREAM_FLAGS_CRC);
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return s->crc_stream ^ CRC_IV;
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}
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int sgetc_uncached(STREAM* s)
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{
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/* if at the end of the buffer, fill it */
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@ -735,10 +727,6 @@ int swrite_uncached(const void* void_data, size_t size, STREAM* f)
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if (available > size)
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available = size;
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/* compute the independent CRC before copying to detect buffer corruption */
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if (f->flags & STREAM_FLAGS_CRC)
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f->crc_stream = crc32c_plain(f->crc_stream, data, available);
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memcpy(f->pos, data, available);
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f->pos += available;
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data += available;
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@ -65,26 +65,6 @@ struct stream {
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*/
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uint32_t crc_uncached;
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/**
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* CRC of the data written to the stream.
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*
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* This is an extra check of the data that is written to
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* file to ensure that it's consistent even in case
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* of memory errors.
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*
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* This extra check takes about 2 seconds for each GB of
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* content file with the Intel CRC instruction,
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* and about 4 seconds without it.
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* But usually this doesn't slow down the write process,
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* as the disk is the bottle-neck.
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*
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* Note that this CRC doesn't have the IV processing.
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*
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* Not used in reading.
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* In writing, it's all the data wrote calling sput() functions.
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*/
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uint32_t crc_stream;
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struct advise_struct* advise; /**< Cache advice state for each handle. */
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};
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@ -147,11 +127,6 @@ int64_t stell(STREAM* s);
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*/
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uint32_t scrc(STREAM* s);
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/**
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* Get the CRC of the processed data in put.
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*/
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uint32_t scrc_stream(STREAM* s);
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/**
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* Check if the buffer has enough data loaded.
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*/
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@ -369,16 +344,6 @@ static inline int sputc(int c, STREAM* s)
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return -1;
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}
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/**
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* Update the crc *before* writing the data in the buffer
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*
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* This must be done before the memory write,
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* to be able to detect memory errors on the buffer,
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* happening before we write it on the file.
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*/
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if (s->flags & STREAM_FLAGS_CRC)
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s->crc_stream = crc32c_plain_char(s->crc_stream, c);
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*s->pos++ = c;
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return 0;
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@ -412,10 +377,6 @@ static __always_inline int swrite(const void* data, size_t size, STREAM* f)
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if (tommy_unlikely(!sptrlookup(f, size)))
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return swrite_uncached(data, size, f);
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/* compute the independent CRC before copying to detect buffer corruption */
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if (f->flags & STREAM_FLAGS_CRC)
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f->crc_stream = crc32c_plain(f->crc_stream, data, size);
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memcpy(f->pos, data, size);
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f->pos += size;
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@ -398,8 +398,68 @@ uint32_t CRC32C_3[256] = {
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0x4a21617b, 0x9764cbc3, 0xf54642fa, 0x2803e842
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};
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#if CONFIG_X86
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int crc_x86;
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#if CONFIG_X86 || CONFIG_ARM_CRC
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static uint32_t crc32c_shift_table[sizeof(size_t) * 8][32];
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static uint32_t crc32c_matrix_times(const uint32_t* matrix, uint32_t vector)
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{
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uint32_t value = 0;
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while (vector) {
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if (vector & 1)
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value ^= *matrix;
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vector >>= 1;
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++matrix;
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}
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return value;
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}
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static void crc32c_matrix_square(uint32_t* square, const uint32_t* matrix)
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{
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unsigned i;
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for (i = 0; i < 32; ++i)
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square[i] = crc32c_matrix_times(matrix, matrix[i]);
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}
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static void crc32c_shift_init(void)
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{
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uint32_t matrix[32];
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uint32_t square[32];
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uint32_t row;
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unsigned i;
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/* reflected Castagnoli polynomial, represented as one zero-bit operator. */
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matrix[0] = 0x82f63b78;
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row = 1;
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for (i = 1; i < 32; ++i) {
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matrix[i] = row;
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row <<= 1;
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}
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/* square three times to obtain the operator for one zero byte. */
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crc32c_matrix_square(square, matrix);
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crc32c_matrix_square(matrix, square);
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crc32c_matrix_square(crc32c_shift_table[0], matrix);
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for (i = 1; i < sizeof(size_t) * 8; ++i)
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crc32c_matrix_square(crc32c_shift_table[i], crc32c_shift_table[i - 1]);
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}
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uint32_t crc32c_shift(uint32_t crc, size_t size)
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{
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unsigned i = 0;
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while (size) {
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if (size & 1)
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crc = crc32c_matrix_times(crc32c_shift_table[i], crc);
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size >>= 1;
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++i;
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}
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return crc;
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}
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#endif
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uint32_t crc32c_gen(uint32_t crc, const unsigned char* ptr, size_t size)
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@ -446,10 +506,14 @@ void crc32c_init(void)
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crc32c = crc32c_gen;
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#if CONFIG_X86
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if (raid_cpu_has_crc32()) {
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crc_x86 = 1;
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crc32c_shift_init();
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crc32c = crc32c_x86;
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}
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#endif
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#if CONFIG_ARM_CRC
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crc32c_shift_init();
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crc32c = crc32c_arm64;
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#endif
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}
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/****************************************************************************/
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144
cmdline/util.h
144
cmdline/util.h
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@ -91,31 +91,14 @@ extern uint32_t CRC32C_1[256];
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extern uint32_t CRC32C_2[256];
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extern uint32_t CRC32C_3[256];
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/**
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* If the CPU support the CRC instructions.
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*/
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#if CONFIG_X86
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extern int crc_x86;
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#endif
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/** Minimum size worth splitting into two hardware CRC lanes. */
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#define CRC32C_2LANE_MIN 4096
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/**
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* Compute CRC-32 (Castagnoli) for a single byte without the IV.
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* Advance a raw CRC-32C by a number of zero bytes.
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* Used to combine independent hardware CRC lanes.
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*/
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static inline uint32_t crc32c_plain_char(uint32_t crc, unsigned char c)
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{
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#if CONFIG_X86
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if (tommy_likely(crc_x86)) {
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asm ("crc32b %1, %0\n" : "+r" (crc) : "m" (c));
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return crc;
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}
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#endif
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#if CONFIG_ARM_CRC
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asm ("crc32cb %w0, %w0, %w1\n" : "+r" (crc) : "r" (c));
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return crc;
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#else
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return CRC32C_0[(crc ^ c) & 0xff] ^ (crc >> 8);
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#endif
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}
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uint32_t crc32c_shift(uint32_t crc, size_t size);
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/**
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* Compute the CRC-32 (Castagnoli) without the IV.
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@ -146,12 +129,31 @@ static inline uint32_t crc32c_x86_plain(uint32_t crc, const unsigned char* ptr,
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{
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#ifdef CONFIG_X86_64
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uint64_t crc64 = crc;
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if (size >= CRC32C_2LANE_MIN) {
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const unsigned char* ptr0 = ptr;
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size_t lane_size = (size / 2) & ~(size_t)31;
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const unsigned char* ptr1 = ptr + lane_size;
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const unsigned char* end = ptr1;
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uint64_t crc0 = crc;
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uint64_t crc1 = 0;
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/* block hashes are normally 16 bytes and dominate content serialization */
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if (tommy_likely(size == 16)) {
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asm ("crc32q %1, %0\n" : "+r" (crc64) : "m" (*(const uint64_t*)ptr));
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asm ("crc32q %1, %0\n" : "+r" (crc64) : "m" (*(const uint64_t*)(ptr + 8)));
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return (uint32_t)crc64;
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/* Keep two dependency chains in flight and combine them only once. */
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while (ptr0 < end) {
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asm ("crc32q %1, %0\n" : "+r" (crc0) : "m" (*(const uint64_t*)ptr0));
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asm ("crc32q %1, %0\n" : "+r" (crc1) : "m" (*(const uint64_t*)ptr1));
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asm ("crc32q %1, %0\n" : "+r" (crc0) : "m" (*(const uint64_t*)(ptr0 + 8)));
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asm ("crc32q %1, %0\n" : "+r" (crc1) : "m" (*(const uint64_t*)(ptr1 + 8)));
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asm ("crc32q %1, %0\n" : "+r" (crc0) : "m" (*(const uint64_t*)(ptr0 + 16)));
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asm ("crc32q %1, %0\n" : "+r" (crc1) : "m" (*(const uint64_t*)(ptr1 + 16)));
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asm ("crc32q %1, %0\n" : "+r" (crc0) : "m" (*(const uint64_t*)(ptr0 + 24)));
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asm ("crc32q %1, %0\n" : "+r" (crc1) : "m" (*(const uint64_t*)(ptr1 + 24)));
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ptr0 += 32;
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ptr1 += 32;
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}
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crc64 = crc32c_shift((uint32_t)crc0, lane_size) ^ (uint32_t)crc1;
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ptr += 2 * lane_size;
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size -= 2 * lane_size;
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}
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while (size >= 32) {
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@ -175,6 +177,33 @@ static inline uint32_t crc32c_x86_plain(uint32_t crc, const unsigned char* ptr,
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}
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crc = (uint32_t)crc64;
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#else
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if (size >= CRC32C_2LANE_MIN) {
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const unsigned char* ptr0 = ptr;
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size_t lane_size = (size / 2) & ~(size_t)15;
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const unsigned char* ptr1 = ptr + lane_size;
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const unsigned char* end = ptr1;
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uint32_t crc0 = crc;
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uint32_t crc1 = 0;
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/* Keep two dependency chains in flight and combine them only once. */
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while (ptr0 < end) {
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asm ("crc32l %1, %0\n" : "+r" (crc0) : "m" (*(const uint32_t*)ptr0));
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asm ("crc32l %1, %0\n" : "+r" (crc1) : "m" (*(const uint32_t*)ptr1));
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asm ("crc32l %1, %0\n" : "+r" (crc0) : "m" (*(const uint32_t*)(ptr0 + 4)));
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asm ("crc32l %1, %0\n" : "+r" (crc1) : "m" (*(const uint32_t*)(ptr1 + 4)));
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asm ("crc32l %1, %0\n" : "+r" (crc0) : "m" (*(const uint32_t*)(ptr0 + 8)));
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asm ("crc32l %1, %0\n" : "+r" (crc1) : "m" (*(const uint32_t*)(ptr1 + 8)));
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asm ("crc32l %1, %0\n" : "+r" (crc0) : "m" (*(const uint32_t*)(ptr0 + 12)));
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asm ("crc32l %1, %0\n" : "+r" (crc1) : "m" (*(const uint32_t*)(ptr1 + 12)));
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ptr0 += 16;
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ptr1 += 16;
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}
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crc = crc32c_shift(crc0, lane_size) ^ crc1;
|
||||
ptr += 2 * lane_size;
|
||||
size -= 2 * lane_size;
|
||||
}
|
||||
|
||||
while (size >= 16) {
|
||||
asm ("crc32l %1, %0\n" : "+r" (crc) : "m" (*(const uint32_t*)ptr));
|
||||
asm ("crc32l %1, %0\n" : "+r" (crc) : "m" (*(const uint32_t*)(ptr + 4)));
|
||||
|
|
@ -211,6 +240,50 @@ static inline uint32_t crc32c_x86_plain(uint32_t crc, const unsigned char* ptr,
|
|||
#if CONFIG_ARM_CRC
|
||||
static inline uint32_t crc32c_arm64_plain(uint32_t crc, const unsigned char* ptr, size_t size)
|
||||
{
|
||||
if (size >= CRC32C_2LANE_MIN) {
|
||||
const unsigned char* ptr0 = ptr;
|
||||
size_t lane_size = (size / 2) & ~(size_t)31;
|
||||
const unsigned char* ptr1 = ptr + lane_size;
|
||||
const unsigned char* end = ptr1;
|
||||
uint32_t crc0 = crc;
|
||||
uint32_t crc1 = 0;
|
||||
|
||||
/* Keep two dependency chains in flight and combine them only once. */
|
||||
while (ptr0 < end) {
|
||||
uint64_t val00;
|
||||
uint64_t val01;
|
||||
uint64_t val02;
|
||||
uint64_t val03;
|
||||
uint64_t val10;
|
||||
uint64_t val11;
|
||||
uint64_t val12;
|
||||
uint64_t val13;
|
||||
|
||||
__builtin_memcpy(&val00, ptr0, 8);
|
||||
__builtin_memcpy(&val10, ptr1, 8);
|
||||
__builtin_memcpy(&val01, ptr0 + 8, 8);
|
||||
__builtin_memcpy(&val11, ptr1 + 8, 8);
|
||||
__builtin_memcpy(&val02, ptr0 + 16, 8);
|
||||
__builtin_memcpy(&val12, ptr1 + 16, 8);
|
||||
__builtin_memcpy(&val03, ptr0 + 24, 8);
|
||||
__builtin_memcpy(&val13, ptr1 + 24, 8);
|
||||
asm ("crc32cx %w0, %w0, %x1\n" : "+r" (crc0) : "r" (val00));
|
||||
asm ("crc32cx %w0, %w0, %x1\n" : "+r" (crc1) : "r" (val10));
|
||||
asm ("crc32cx %w0, %w0, %x1\n" : "+r" (crc0) : "r" (val01));
|
||||
asm ("crc32cx %w0, %w0, %x1\n" : "+r" (crc1) : "r" (val11));
|
||||
asm ("crc32cx %w0, %w0, %x1\n" : "+r" (crc0) : "r" (val02));
|
||||
asm ("crc32cx %w0, %w0, %x1\n" : "+r" (crc1) : "r" (val12));
|
||||
asm ("crc32cx %w0, %w0, %x1\n" : "+r" (crc0) : "r" (val03));
|
||||
asm ("crc32cx %w0, %w0, %x1\n" : "+r" (crc1) : "r" (val13));
|
||||
ptr0 += 32;
|
||||
ptr1 += 32;
|
||||
}
|
||||
|
||||
crc = crc32c_shift(crc0, lane_size) ^ crc1;
|
||||
ptr += 2 * lane_size;
|
||||
size -= 2 * lane_size;
|
||||
}
|
||||
|
||||
while (size >= 8) {
|
||||
uint64_t val;
|
||||
__builtin_memcpy(&val, ptr, 8);
|
||||
|
|
@ -235,23 +308,6 @@ static inline uint32_t crc32c_arm64_plain(uint32_t crc, const unsigned char* ptr
|
|||
}
|
||||
#endif
|
||||
|
||||
/**
|
||||
* Compute CRC-32 (Castagnoli) without the IV.
|
||||
*/
|
||||
static inline uint32_t crc32c_plain(uint32_t crc, const unsigned char* ptr, size_t size)
|
||||
{
|
||||
#if CONFIG_X86
|
||||
if (tommy_likely(crc_x86)) {
|
||||
return crc32c_x86_plain(crc, ptr, size);
|
||||
}
|
||||
#endif
|
||||
#if CONFIG_ARM_CRC
|
||||
return crc32c_arm64_plain(crc, ptr, size);
|
||||
#else
|
||||
return crc32c_gen_plain(crc, ptr, size);
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* Compute the CRC-32 (Castagnoli)
|
||||
*/
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue