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authorDave Barach <dave@barachs.net>2020-02-26 10:27:08 -0500
committerFlorin Coras <florin.coras@gmail.com>2020-02-26 18:50:35 +0000
commit5fa4525543b212dd04b4f687722bf7feb1eeb6f9 (patch)
treeacbfb597680d6c2b1102f570b92d28e39afb5e30
parent2fcd265d383a17e74b7d51f26e81bd27f830bf6b (diff)
ethernet: configure system default ethernet MTU
Type: feature Signed-off-by: Dave Barach <dave@barachs.net> Change-Id: I9c2081c56cfbf61df7e5170002f5f65902f49942
-rw-r--r--src/vnet/ethernet/ethernet.h3
-rw-r--r--src/vnet/ethernet/init.c5
-rw-r--r--src/vnet/ethernet/interface.c27
3 files changed, 33 insertions, 2 deletions
diff --git a/src/vnet/ethernet/ethernet.h b/src/vnet/ethernet/ethernet.h
index 2e5209c4423..2f544bbdbaa 100644
--- a/src/vnet/ethernet/ethernet.h
+++ b/src/vnet/ethernet/ethernet.h
@@ -315,6 +315,9 @@ typedef struct ethernet_main_t_
/** Functions to call when interface hw address changes. */
ethernet_address_change_ctx_t *address_change_callbacks;
+ /** Default interface MTU */
+ u32 default_mtu;
+
} ethernet_main_t;
extern ethernet_main_t ethernet_main;
diff --git a/src/vnet/ethernet/init.c b/src/vnet/ethernet/init.c
index 9fd95f1b75a..f78b65c7cc0 100644
--- a/src/vnet/ethernet/init.c
+++ b/src/vnet/ethernet/init.c
@@ -88,6 +88,11 @@ ethernet_init (vlib_main_t * vm)
em->type_info_by_name = hash_create_string (0, sizeof (uword));
em->type_info_by_type = hash_create (0, sizeof (uword));
+ /*
+ * System default ethernet interface MTU, configure via ethernet_config in
+ * interface.c if desired.
+ */
+ em->default_mtu = 9000;
#define ethernet_type(n,s) add_type (em, ETHERNET_TYPE_##s, #s);
#include "types.def"
diff --git a/src/vnet/ethernet/interface.c b/src/vnet/ethernet/interface.c
index 39e5cfb3cf8..3b9093c6031 100644
--- a/src/vnet/ethernet/interface.c
+++ b/src/vnet/ethernet/interface.c
@@ -359,8 +359,8 @@ ethernet_register_interface (vnet_main_t * vnm,
hi->max_packet_bytes = hi->max_supported_packet_bytes =
ETHERNET_MAX_PACKET_BYTES;
- /* Standard default ethernet MTU. */
- vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, 9000);
+ /* Default ethernet MTU, 9000 unless set by ethernet_config see below */
+ vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, em->default_mtu);
clib_memcpy (ei->address, address, sizeof (ei->address));
vec_add (hi->hw_address, address, sizeof (ei->address));
@@ -1192,6 +1192,29 @@ VLIB_CLI_COMMAND (delete_sub_interface_command, static) = {
};
/* *INDENT-ON* */
+static clib_error_t *
+ethernet_config (vlib_main_t * vm, unformat_input_t * input)
+{
+ ethernet_main_t *em = &ethernet_main;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "default-mtu %u", &em->default_mtu))
+ {
+ if (em->default_mtu < 64 || em->default_mtu > 9000)
+ return clib_error_return (0, "default MTU must be >=64, <=9000");
+ }
+ else
+ {
+ return clib_error_return (0, "unknown input '%U'",
+ format_unformat_error, input);
+ }
+ }
+ return 0;
+}
+
+VLIB_CONFIG_FUNCTION (ethernet_config, "ethernet");
+
/*
* fd.io coding-style-patch-verification: ON
*