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authorNeale Ranns <neale@graphiant.com>2021-08-06 13:12:00 +0000
committerOle Tr�an <otroan@employees.org>2021-08-11 08:48:42 +0000
commit7244a706430746facf20a5f047666b74d440cef8 (patch)
treeb6fe66ee36220d55639bdb81262daefadd323fc5 /src/vnet/ip/ip4_mtrie.h
parent6bb2db0ea860812d9c366935312e7849deca9c93 (diff)
ip: [re]introduce the 8-8-8-8 stride MTRIE
Type: improvement there's a time-space trade-off between the 16-8-8 and 8-8-8-8 stride. FIB continues to use the 16-8-8. Other features are now free to make the choice. Signed-off-by: Neale Ranns <neale@graphiant.com> Change-Id: I6691a163486ce62e75e629f6ef0c990f253df8e5
Diffstat (limited to 'src/vnet/ip/ip4_mtrie.h')
-rw-r--r--src/vnet/ip/ip4_mtrie.h58
1 files changed, 54 insertions, 4 deletions
diff --git a/src/vnet/ip/ip4_mtrie.h b/src/vnet/ip/ip4_mtrie.h
index 332e34a75ca..ec417c9a9f7 100644
--- a/src/vnet/ip/ip4_mtrie.h
+++ b/src/vnet/ip/ip4_mtrie.h
@@ -122,7 +122,7 @@ STATIC_ASSERT (0 == sizeof (ip4_mtrie_8_ply_t) % CLIB_CACHE_LINE_BYTES,
"IP4 Mtrie ply cache line");
/**
- * @brief The mutiway-TRIE.
+ * @brief The mutiway-TRIE with a 16-8-8 stride.
* There is no data associated with the mtrie apart from the top PLY
*/
typedef struct
@@ -136,14 +136,26 @@ typedef struct
} ip4_mtrie_16_t;
/**
+ * @brief The mutiway-TRIE with a 8-8-8-8 stride.
+ * There is no data associated with the mtrie apart from the top PLY
+ */
+typedef struct
+{
+ /* pool index of the root ply */
+ u32 root_ply;
+} ip4_mtrie_8_t;
+
+/**
* @brief Initialise an mtrie
*/
void ip4_mtrie_16_init (ip4_mtrie_16_t *m);
+void ip4_mtrie_8_init (ip4_mtrie_8_t *m);
/**
- * @brief Free an mtrie, It must be emty when free'd
+ * @brief Free an mtrie, It must be empty when free'd
*/
void ip4_mtrie_16_free (ip4_mtrie_16_t *m);
+void ip4_mtrie_8_free (ip4_mtrie_8_t *m);
/**
* @brief Add a route/entry to the mtrie
@@ -151,6 +163,9 @@ void ip4_mtrie_16_free (ip4_mtrie_16_t *m);
void ip4_mtrie_16_route_add (ip4_mtrie_16_t *m,
const ip4_address_t *dst_address,
u32 dst_address_length, u32 adj_index);
+void ip4_mtrie_8_route_add (ip4_mtrie_8_t *m, const ip4_address_t *dst_address,
+ u32 dst_address_length, u32 adj_index);
+
/**
* @brief remove a route/entry to the mtrie
*/
@@ -158,16 +173,21 @@ void ip4_mtrie_16_route_del (ip4_mtrie_16_t *m,
const ip4_address_t *dst_address,
u32 dst_address_length, u32 adj_index,
u32 cover_address_length, u32 cover_adj_index);
+void ip4_mtrie_8_route_del (ip4_mtrie_8_t *m, const ip4_address_t *dst_address,
+ u32 dst_address_length, u32 adj_index,
+ u32 cover_address_length, u32 cover_adj_index);
/**
* @brief return the memory used by the table
*/
uword ip4_mtrie_16_memory_usage (ip4_mtrie_16_t *m);
+uword ip4_mtrie_8_memory_usage (ip4_mtrie_8_t *m);
/**
* @brief Format/display the contents of the mtrie
*/
format_function_t format_ip4_mtrie_16;
+format_function_t format_ip4_mtrie_8;
/**
* @brief A global pool of 8bit stride plys
@@ -197,8 +217,7 @@ ip4_mtrie_leaf_get_adj_index (ip4_mtrie_leaf_t n)
* @brief Lookup step. Processes 1 byte of 4 byte ip4 address.
*/
always_inline ip4_mtrie_leaf_t
-ip4_mtrie_16_lookup_step (const ip4_mtrie_16_t *m,
- ip4_mtrie_leaf_t current_leaf,
+ip4_mtrie_16_lookup_step (ip4_mtrie_leaf_t current_leaf,
const ip4_address_t *dst_address,
u32 dst_address_byte_index)
{
@@ -229,6 +248,37 @@ ip4_mtrie_16_lookup_step_one (const ip4_mtrie_16_t *m,
return next_leaf;
}
+always_inline ip4_mtrie_leaf_t
+ip4_mtrie_8_lookup_step (ip4_mtrie_leaf_t current_leaf,
+ const ip4_address_t *dst_address,
+ u32 dst_address_byte_index)
+{
+ ip4_mtrie_8_ply_t *ply;
+
+ uword current_is_terminal = ip4_mtrie_leaf_is_terminal (current_leaf);
+
+ if (!current_is_terminal)
+ {
+ ply = ip4_ply_pool + (current_leaf >> 1);
+ return (ply->leaves[dst_address->as_u8[dst_address_byte_index]]);
+ }
+
+ return current_leaf;
+}
+
+always_inline ip4_mtrie_leaf_t
+ip4_mtrie_8_lookup_step_one (const ip4_mtrie_8_t *m,
+ const ip4_address_t *dst_address)
+{
+ ip4_mtrie_leaf_t next_leaf;
+ ip4_mtrie_8_ply_t *ply;
+
+ ply = pool_elt_at_index (ip4_ply_pool, m->root_ply);
+ next_leaf = ply->leaves[dst_address->as_u8[0]];
+
+ return next_leaf;
+}
+
#endif /* included_ip_ip4_fib_h */
/*