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authorOle Troan <ot@cisco.com>2018-06-07 10:17:57 +0200
committerDamjan Marion <dmarion@me.com>2018-06-11 10:25:59 +0000
commitd723161e038d00e59766aa67a6a0dcc350227e4b (patch)
tree24f5a1d87ebdc0012f28d42aa80a9f5d760073bf /src/vnet/interface.c
parentf4fd0d4217ab6c41fe6b093871bd40ac130e6486 (diff)
MTU: Software interface / Per-protocol MTU support
This patch separates setting of hardware interfaec and software interface MTU. Software MTU is L2 payload MTU (i.e. not including L2 header). Per-protocol MTU for IPv4, IPv6 and MPLS can also be set. Currently only IP4, IP6 are enabled in adjacency / rewrite code. Documentation in src/vnet/MTU.md Change-Id: Iee2fd6f0bbc8210748dd8e073ab9fab87d323690 Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/vnet/interface.c')
-rw-r--r--src/vnet/interface.c101
1 files changed, 82 insertions, 19 deletions
diff --git a/src/vnet/interface.c b/src/vnet/interface.c
index 797fe44419a..7a2c3abd2d4 100644
--- a/src/vnet/interface.c
+++ b/src/vnet/interface.c
@@ -122,22 +122,6 @@ unserialize_vnet_sw_interface_set_flags (serialize_main_t * m, va_list * va)
/* helper_flags no redistribution */ 0);
}
-void
-vnet_hw_interface_set_mtu (vnet_main_t * vnm, u32 hw_if_index, u32 mtu)
-{
- vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
-
- if (hi->max_packet_bytes != mtu)
- {
- u16 l3_pad = hi->max_packet_bytes - hi->max_l3_packet_bytes[VLIB_TX];
- hi->max_packet_bytes = mtu;
- hi->max_l3_packet_bytes[VLIB_TX] =
- hi->max_l3_packet_bytes[VLIB_RX] = mtu - l3_pad;
- ethernet_set_flags (vnm, hw_if_index, ETHERNET_INTERFACE_FLAG_MTU);
- adj_mtu_update (hw_if_index);
- }
-}
-
static void
unserialize_vnet_hw_interface_set_flags (serialize_main_t * m, va_list * va)
{
@@ -681,6 +665,71 @@ vnet_delete_sw_interface (vnet_main_t * vnm, u32 sw_if_index)
pool_put (im->sw_interfaces, sw);
}
+static clib_error_t *
+call_sw_interface_mtu_change_callbacks (vnet_main_t * vnm, u32 sw_if_index)
+{
+ return call_elf_section_interface_callbacks
+ (vnm, sw_if_index, 0, vnm->sw_interface_mtu_change_functions);
+}
+
+void
+vnet_sw_interface_set_mtu (vnet_main_t * vnm, u32 sw_if_index, u32 mtu)
+{
+ vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
+
+ if (si->mtu[VNET_MTU_L3] != mtu)
+ {
+ si->mtu[VNET_MTU_L3] = mtu;
+ call_sw_interface_mtu_change_callbacks (vnm, sw_if_index);
+ }
+}
+
+void
+vnet_sw_interface_set_protocol_mtu (vnet_main_t * vnm, u32 sw_if_index,
+ u32 mtu[])
+{
+ vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
+ bool changed = false;
+ int i;
+
+ for (i = 0; i < VNET_N_MTU; i++)
+ {
+ if (si->mtu[i] != mtu[i])
+ {
+ si->mtu[i] = mtu[i];
+ changed = true;
+ }
+ }
+ /* Notify interested parties */
+ if (changed)
+ call_sw_interface_mtu_change_callbacks (vnm, sw_if_index);
+}
+
+/*
+ * Reflect a change in hardware MTU on protocol MTUs
+ */
+static walk_rc_t
+sw_interface_walk_callback (vnet_main_t * vnm, u32 sw_if_index, void *ctx)
+{
+ u32 *link_mtu = ctx;
+ vnet_sw_interface_set_mtu (vnm, sw_if_index, *link_mtu);
+ return WALK_CONTINUE;
+}
+
+void
+vnet_hw_interface_set_mtu (vnet_main_t * vnm, u32 hw_if_index, u32 mtu)
+{
+ vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
+
+ if (hi->max_packet_bytes != mtu)
+ {
+ hi->max_packet_bytes = mtu;
+ ethernet_set_flags (vnm, hw_if_index, ETHERNET_INTERFACE_FLAG_MTU);
+ vnet_hw_interface_walk_sw (vnm, hw_if_index, sw_interface_walk_callback,
+ &mtu);
+ }
+}
+
static void
setup_tx_node (vlib_main_t * vm,
u32 node_index, vnet_device_class_t * dev_class)
@@ -762,9 +811,7 @@ vnet_register_interface (vnet_main_t * vnm,
hw->max_rate_bits_per_sec = 0;
hw->min_packet_bytes = 0;
- hw->per_packet_overhead_bytes = 0;
- hw->max_l3_packet_bytes[VLIB_RX] = ~0;
- hw->max_l3_packet_bytes[VLIB_TX] = ~0;
+ vnet_sw_interface_set_mtu (vnm, hw->sw_if_index, 0);
if (dev_class->tx_function == 0)
goto no_output_nodes; /* No output/tx nodes to create */
@@ -1523,6 +1570,22 @@ vnet_link_to_l3_proto (vnet_link_t link)
return (0);
}
+vnet_mtu_t
+vnet_link_to_mtu (vnet_link_t link)
+{
+ switch (link)
+ {
+ case VNET_LINK_IP4:
+ return (VNET_MTU_IP4);
+ case VNET_LINK_IP6:
+ return (VNET_MTU_IP6);
+ case VNET_LINK_MPLS:
+ return (VNET_MTU_MPLS);
+ default:
+ return (VNET_MTU_L3);
+ }
+}
+
u8 *
default_build_rewrite (vnet_main_t * vnm,
u32 sw_if_index,