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authorNeale Ranns <nranns@cisco.com>2017-08-12 02:12:00 -0700
committerNeale Ranns <nranns@cisco.com>2017-08-21 04:07:00 -0700
commit43161a873375ddf156cf6fbe8764bfc206b38fa0 (patch)
tree939e5455aaff68341d387b559f743dc049b03377 /src/vnet/adj/adj_midchain.c
parent352829f538783afe8609f09850f45536a4779b70 (diff)
PPPoE usses a midchain adjacency stack on an interface-tx DPO
1) introduce an interface-tx DPO. This is a simple wrapper around a sw_if_index. enhance DPO stacking functions to allow per-instance next-nodes and hence allow children to stack onto the interface per-instance tx node and not on 'interface-output'. 2) update PPPoE code to use ta midchain stack on a interface-tx DPO of the encap-interface. This remove the need for pppoe_encap node (which is replaced by the adj-midchain-tx) and interface-output node is no longer used (see above). Since PPPoE encap node is no longer needed, the PPPoE seesion does not need to be retrieved in the data-path, hence the cahce misses are removed. Change-Id: Id8b40f53daa14889a9c51d802e14fed7fba4399a Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/adj/adj_midchain.c')
-rw-r--r--src/vnet/adj/adj_midchain.c126
1 files changed, 91 insertions, 35 deletions
diff --git a/src/vnet/adj/adj_midchain.c b/src/vnet/adj/adj_midchain.c
index a93a1c3e..e9a510b0 100644
--- a/src/vnet/adj/adj_midchain.c
+++ b/src/vnet/adj/adj_midchain.c
@@ -65,8 +65,7 @@ adj_midchain_tx_inline (vlib_main_t * vm,
/* set up to enqueue to our disposition with index = next_index */
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
- while (n_left_from >= 4 && n_left_to_next > 2)
+ while (n_left_from >= 8 && n_left_to_next > 4)
{
u32 bi0, adj_index0, next0;
const ip_adjacency_t * adj0;
@@ -76,49 +75,75 @@ adj_midchain_tx_inline (vlib_main_t * vm,
const ip_adjacency_t * adj1;
const dpo_id_t *dpo1;
vlib_buffer_t * b1;
+ u32 bi2, adj_index2, next2;
+ const ip_adjacency_t * adj2;
+ const dpo_id_t *dpo2;
+ vlib_buffer_t * b2;
+ u32 bi3, adj_index3, next3;
+ const ip_adjacency_t * adj3;
+ const dpo_id_t *dpo3;
+ vlib_buffer_t * b3;
/* Prefetch next iteration. */
{
- vlib_buffer_t * p2, * p3;
-
- p2 = vlib_get_buffer (vm, from[2]);
- p3 = vlib_get_buffer (vm, from[3]);
-
- vlib_prefetch_buffer_header (p2, LOAD);
- vlib_prefetch_buffer_header (p3, LOAD);
-
- CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
- CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+ vlib_buffer_t * p4, * p5;
+ vlib_buffer_t * p6, * p7;
+
+ p4 = vlib_get_buffer (vm, from[4]);
+ p5 = vlib_get_buffer (vm, from[5]);
+ p6 = vlib_get_buffer (vm, from[6]);
+ p7 = vlib_get_buffer (vm, from[7]);
+
+ vlib_prefetch_buffer_header (p4, LOAD);
+ vlib_prefetch_buffer_header (p5, LOAD);
+ vlib_prefetch_buffer_header (p6, LOAD);
+ vlib_prefetch_buffer_header (p7, LOAD);
}
bi0 = from[0];
to_next[0] = bi0;
bi1 = from[1];
to_next[1] = bi1;
+ bi2 = from[2];
+ to_next[2] = bi2;
+ bi3 = from[3];
+ to_next[3] = bi3;
- from += 2;
- to_next += 2;
- n_left_from -= 2;
- n_left_to_next -= 2;
+ from += 4;
+ to_next += 4;
+ n_left_from -= 4;
+ n_left_to_next -= 4;
b0 = vlib_get_buffer(vm, bi0);
b1 = vlib_get_buffer(vm, bi1);
+ b2 = vlib_get_buffer(vm, bi2);
+ b3 = vlib_get_buffer(vm, bi3);
/* Follow the DPO on which the midchain is stacked */
adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
adj_index1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
+ adj_index2 = vnet_buffer(b2)->ip.adj_index[VLIB_TX];
+ adj_index3 = vnet_buffer(b3)->ip.adj_index[VLIB_TX];
adj0 = adj_get(adj_index0);
adj1 = adj_get(adj_index1);
+ adj2 = adj_get(adj_index2);
+ adj3 = adj_get(adj_index3);
dpo0 = &adj0->sub_type.midchain.next_dpo;
dpo1 = &adj1->sub_type.midchain.next_dpo;
+ dpo2 = &adj2->sub_type.midchain.next_dpo;
+ dpo3 = &adj3->sub_type.midchain.next_dpo;
next0 = dpo0->dpoi_next_node;
next1 = dpo1->dpoi_next_node;
+ next2 = dpo2->dpoi_next_node;
+ next3 = dpo3->dpoi_next_node;
- vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
- vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+ vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+ vnet_buffer(b2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
+ vnet_buffer(b3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
if (interface_count)
{
@@ -134,6 +159,18 @@ adj_midchain_tx_inline (vlib_main_t * vm,
adj1->rewrite_header.sw_if_index,
1,
vlib_buffer_length_in_chain (vm, b1));
+ vlib_increment_combined_counter (im->combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_TX,
+ thread_index,
+ adj2->rewrite_header.sw_if_index,
+ 1,
+ vlib_buffer_length_in_chain (vm, b2));
+ vlib_increment_combined_counter (im->combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_TX,
+ thread_index,
+ adj3->rewrite_header.sw_if_index,
+ 1,
+ vlib_buffer_length_in_chain (vm, b3));
}
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
@@ -148,11 +185,23 @@ adj_midchain_tx_inline (vlib_main_t * vm,
b1, sizeof (*tr));
tr->ai = adj_index1;
}
+ if (PREDICT_FALSE(b2->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ adj_midchain_tx_trace_t *tr = vlib_add_trace (vm, node,
+ b2, sizeof (*tr));
+ tr->ai = adj_index2;
+ }
+ if (PREDICT_FALSE(b3->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ adj_midchain_tx_trace_t *tr = vlib_add_trace (vm, node,
+ b3, sizeof (*tr));
+ tr->ai = adj_index3;
+ }
- vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
to_next, n_left_to_next,
- bi0, bi1,
- next0, next1);
+ bi0, bi1, bi2, bi3,
+ next0, next1, next2, next3);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
@@ -175,7 +224,7 @@ adj_midchain_tx_inline (vlib_main_t * vm,
adj0 = adj_get(adj_index0);
dpo0 = &adj0->sub_type.midchain.next_dpo;
next0 = dpo0->dpoi_next_node;
- vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
if (interface_count)
{
@@ -392,6 +441,17 @@ adj_nbr_midchain_get_tx_node (ip_adjacency_t *adj)
adj_midchain_tx_node.index);
}
+static u32
+adj_nbr_midchain_get_feature_node (ip_adjacency_t *adj)
+{
+ if (adj->ia_flags & ADJ_FLAG_MIDCHAIN_NO_COUNT)
+ {
+ return (adj_midchain_tx_no_count_feature_node[adj->ia_link]);
+ }
+
+ return (adj_midchain_tx_feature_node[adj->ia_link]);
+}
+
/**
* adj_midchain_setup
*
@@ -414,10 +474,7 @@ adj_midchain_setup (adj_index_t adj_index,
adj->ia_flags |= flags;
arc_index = adj_midchain_get_feature_arc_index_for_link_type (adj);
- feature_index = (flags & ADJ_FLAG_MIDCHAIN_NO_COUNT) ?
- adj_midchain_tx_no_count_feature_node[adj->ia_link] :
- adj_midchain_tx_feature_node[adj->ia_link];
-
+ feature_index = adj_nbr_midchain_get_feature_node(adj);
tx_node = adj_nbr_midchain_get_tx_node(adj);
vnet_feature_enable_disable_with_index (arc_index, feature_index,
@@ -432,8 +489,8 @@ adj_midchain_setup (adj_index_t adj_index,
* need to get to the stacked child's node.
*/
dpo_stack_from_node(tx_node,
- &adj->sub_type.midchain.next_dpo,
- drop_dpo_get(vnet_link_to_dpo_proto(adj->ia_link)));
+ &adj->sub_type.midchain.next_dpo,
+ drop_dpo_get(vnet_link_to_dpo_proto(adj->ia_link)));
}
/**
@@ -495,10 +552,9 @@ adj_nbr_midchain_unstack (adj_index_t adj_index)
* stack on the drop
*/
dpo_stack(DPO_ADJACENCY_MIDCHAIN,
- vnet_link_to_dpo_proto(adj->ia_link),
- &adj->sub_type.midchain.next_dpo,
- drop_dpo_get(vnet_link_to_dpo_proto(adj->ia_link)));
-
+ vnet_link_to_dpo_proto(adj->ia_link),
+ &adj->sub_type.midchain.next_dpo,
+ drop_dpo_get(vnet_link_to_dpo_proto(adj->ia_link)));
CLIB_MEMORY_BARRIER();
}
@@ -537,9 +593,9 @@ format_adj_midchain (u8* s, va_list *ap)
format_vnet_rewrite,
&adj->rewrite_header, sizeof (adj->rewrite_data), indent);
s = format (s, "\n%Ustacked-on:\n%U%U",
- format_white_space, indent,
- format_white_space, indent+2,
- format_dpo_id, &adj->sub_type.midchain.next_dpo, indent+2);
+ format_white_space, indent,
+ format_white_space, indent+2,
+ format_dpo_id, &adj->sub_type.midchain.next_dpo, indent+2);
return (s);
}