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authorDamjan Marion <damarion@cisco.com>2021-09-20 13:39:37 +0200
committerDamjan Marion <damarion@cisco.com>2021-09-20 17:44:10 +0200
commit3bb2da9cb115a489061ffb70332ac0801ce2551b (patch)
tree3112838d5d458d559ed3785028569b742542d8e0 /src
parent3d5e74172de146782244d7638a8b2c4efcb4006e (diff)
classify: avoid dependent read of classify mask
Type: improvement Change-Id: I176f08c74eb58a78f7fbdb48fd4592e6ddf74d34 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src')
-rw-r--r--src/vnet/classify/vnet_classify.c11
-rw-r--r--src/vnet/classify/vnet_classify.h7
2 files changed, 9 insertions, 9 deletions
diff --git a/src/vnet/classify/vnet_classify.c b/src/vnet/classify/vnet_classify.c
index 48d444271c5..796250735e4 100644
--- a/src/vnet/classify/vnet_classify.c
+++ b/src/vnet/classify/vnet_classify.c
@@ -139,7 +139,7 @@ vnet_classify_new_table (vnet_classify_main_t *cm, const u8 *mask,
pool_get_aligned_zero (cm->tables, t, CLIB_CACHE_LINE_BYTES);
- vec_validate_aligned (t->mask, match_n_vectors - 1, sizeof (u32x4));
+ clib_memset_u32 (t->mask, 0, 4 * ARRAY_LEN (t->mask));
clib_memcpy_fast (t->mask, mask, match_n_vectors * sizeof (u32x4));
t->next_table_index = ~0;
@@ -175,7 +175,6 @@ vnet_classify_delete_table_index (vnet_classify_main_t * cm,
/* Recursively delete the entire chain */
vnet_classify_delete_table_index (cm, t->next_table_index, del_chain);
- vec_free (t->mask);
vec_free (t->buckets);
clib_mem_destroy_heap (t->mheap);
pool_put (cm->tables, t);
@@ -1649,13 +1648,13 @@ filter_table_mask_compare (void *a1, void *a2)
m1 = (u8 *) (t1->mask);
m2 = (u8 *) (t2->mask);
- for (i = 0; i < vec_len (t1->mask) * sizeof (u32x4); i++)
+ for (i = 0; i < t1->match_n_vectors * sizeof (u32x4); i++)
{
n1 += count_set_bits (m1[0]);
m1++;
}
- for (i = 0; i < vec_len (t2->mask) * sizeof (u32x4); i++)
+ for (i = 0; i < t2->match_n_vectors * sizeof (u32x4); i++)
{
n2 += count_set_bits (m2[0]);
m2++;
@@ -1815,11 +1814,11 @@ classify_lookup_chain (u32 table_index, u8 * mask, u32 n_skip, u32 n_match)
continue;
/* Masks aren't congruent, can't use this table. */
- if (vec_len (t->mask) * sizeof (u32x4) != vec_len (mask))
+ if (t->match_n_vectors * sizeof (u32x4) != vec_len (mask))
continue;
/* Masks aren't bit-for-bit identical, can't use this table. */
- if (memcmp (t->mask, mask, vec_len (mask)))
+ if (memcmp (t->mask, mask, t->match_n_vectors * sizeof (u32x4)))
continue;
/* Winner... */
diff --git a/src/vnet/classify/vnet_classify.h b/src/vnet/classify/vnet_classify.h
index 06784e0541e..196a24172cc 100644
--- a/src/vnet/classify/vnet_classify.h
+++ b/src/vnet/classify/vnet_classify.h
@@ -147,9 +147,6 @@ typedef struct
typedef struct
{
CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
- /* Mask to apply after skipping N vectors */
- u32x4 *mask;
-
/* hash Buckets */
vnet_classify_bucket_t *buckets;
@@ -196,6 +193,10 @@ typedef struct
/* Writer (only) lock for this table */
clib_spinlock_t writer_lock;
+ CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
+ /* Mask to apply after skipping N vectors */
+ u32x4 mask[8];
+
} vnet_classify_table_t;
/**