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Fix memory allocation issue for BLAKE3 context

The kmem_alloc(sizeof (*ctx), KM_NOSLEEP) call on FreeBSD can't be
used in this code segment. Work around this by pre-allocating a percpu
context array for later use.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tino Reichardt <milky-zfs@mcmilk.de>
Closes #13568
vendor/openzfs/master
Tino Reichardt 2 weeks ago committed by GitHub
parent
commit
deb1213098
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GPG Key ID: 4AEE18F83AFDEB23
  1. 5
      include/sys/blake3.h
  2. 28
      module/icp/algs/blake3/blake3_impl.c
  3. 12
      module/zfs/blake3_zfs.c
  4. 7
      module/zfs/zfs_chksum.c

5
include/sys/blake3.h

@ -92,6 +92,11 @@ void Blake3_Final(const BLAKE3_CTX *ctx, uint8_t *out);
void Blake3_FinalSeek(const BLAKE3_CTX *ctx, uint64_t seek, uint8_t *out,
size_t out_len);
/* these are pre-allocated contexts */
extern void **blake3_per_cpu_ctx;
extern void blake3_per_cpu_ctx_init(void);
extern void blake3_per_cpu_ctx_fini(void);
/* return number of supported implementations */
extern int blake3_get_impl_count(void);

28
module/icp/algs/blake3/blake3_impl.c

@ -201,6 +201,34 @@ blake3_impl_get_ops(void)
return (blake3_selected_impl);
}
#if defined(_KERNEL)
void **blake3_per_cpu_ctx;
void
blake3_per_cpu_ctx_init(void)
{
/*
* Create "The Godfather" ptr to hold all blake3 ctx
*/
blake3_per_cpu_ctx = kmem_alloc(max_ncpus * sizeof (void *), KM_SLEEP);
for (int i = 0; i < max_ncpus; i++) {
blake3_per_cpu_ctx[i] = kmem_alloc(sizeof (BLAKE3_CTX),
KM_SLEEP);
}
}
void
blake3_per_cpu_ctx_fini(void)
{
for (int i = 0; i < max_ncpus; i++) {
memset(blake3_per_cpu_ctx[i], 0, sizeof (BLAKE3_CTX));
kmem_free(blake3_per_cpu_ctx[i], sizeof (BLAKE3_CTX));
}
memset(blake3_per_cpu_ctx, 0, max_ncpus * sizeof (void *));
kmem_free(blake3_per_cpu_ctx, max_ncpus * sizeof (void *));
}
#endif
#if defined(_KERNEL) && defined(__linux__)
static int
icp_blake3_impl_set(const char *name, zfs_kernel_param_t *kp)

12
module/zfs/blake3_zfs.c

@ -47,18 +47,22 @@ void
abd_checksum_blake3_native(abd_t *abd, uint64_t size, const void *ctx_template,
zio_cksum_t *zcp)
{
BLAKE3_CTX *ctx;
ctx = kmem_alloc(sizeof (*ctx), KM_NOSLEEP);
ASSERT(ctx != 0);
ASSERT(ctx_template != 0);
#if defined(_KERNEL)
BLAKE3_CTX *ctx = blake3_per_cpu_ctx[CPU_SEQID_UNSTABLE];
#else
BLAKE3_CTX *ctx = kmem_alloc(sizeof (*ctx), KM_SLEEP);
#endif
memcpy(ctx, ctx_template, sizeof (*ctx));
(void) abd_iterate_func(abd, 0, size, blake3_incremental, ctx);
Blake3_Final(ctx, (uint8_t *)zcp);
#if !defined(_KERNEL)
memset(ctx, 0, sizeof (*ctx));
kmem_free(ctx, sizeof (*ctx));
#endif
}
/*

7
module/zfs/zfs_chksum.c

@ -277,6 +277,9 @@ chksum_benchmark(void)
void
chksum_init(void)
{
#ifdef _KERNEL
blake3_per_cpu_ctx_init();
#endif
/* Benchmark supported implementations */
chksum_benchmark();
@ -313,4 +316,8 @@ chksum_fini(void)
chksum_stat_cnt = 0;
chksum_stat_data = 0;
}
#ifdef _KERNEL
blake3_per_cpu_ctx_fini();
#endif
}

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