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authorBenoît Ganne <bganne@cisco.com>2020-10-20 16:24:17 +0200
committerDamjan Marion <dmarion@me.com>2020-11-13 11:17:50 +0000
commitb44c77d01dcf9ebf80d7bcab097515ad8135bc05 (patch)
tree71070f6ea6b5dc989730e1775f6c7916a07938fc /src/vnet/ethernet
parent41c0f45a56d4db5b2ee4ae4fff7f3f0571a23189 (diff)
ethernet: mac must support 64-bits loads
ethernet dataplane loads MAC addresses as 64-bits loads for efficiency. We must make sure it is valid, especially for the vector of secondary MACs. Type: fix Change-Id: I851e319b8a973c154e85ff9f05f3b8e385939788 Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src/vnet/ethernet')
-rw-r--r--src/vnet/ethernet/ethernet.h15
-rw-r--r--src/vnet/ethernet/interface.c73
-rw-r--r--src/vnet/ethernet/node.c19
3 files changed, 67 insertions, 40 deletions
diff --git a/src/vnet/ethernet/ethernet.h b/src/vnet/ethernet/ethernet.h
index afb932931b7..a83b0f39295 100644
--- a/src/vnet/ethernet/ethernet.h
+++ b/src/vnet/ethernet/ethernet.h
@@ -132,6 +132,17 @@ typedef u32 (ethernet_flag_change_function_t)
#define ETHERNET_MIN_PACKET_BYTES 64
#define ETHERNET_MAX_PACKET_BYTES 9216
+/* ethernet dataplane loads mac address as u64 for efficiency */
+typedef union ethernet_interface_address
+{
+ struct
+ {
+ mac_address_t mac;
+ u16 zero;
+ };
+ u64 as_u64;
+} ethernet_interface_address_t;
+
/* Ethernet interface instance. */
typedef struct ethernet_interface
{
@@ -160,10 +171,10 @@ typedef struct ethernet_interface
u32 driver_instance;
/* Ethernet (MAC) address for this interface. */
- u8 address[6];
+ ethernet_interface_address_t address;
/* Secondary MAC addresses for this interface */
- mac_address_t *secondary_addrs;
+ ethernet_interface_address_t *secondary_addrs;
} ethernet_interface_t;
extern vnet_hw_interface_class_t ethernet_hw_interface_class;
diff --git a/src/vnet/ethernet/interface.c b/src/vnet/ethernet/interface.c
index b09e2b02256..b5c48193bf3 100644
--- a/src/vnet/ethernet/interface.c
+++ b/src/vnet/ethernet/interface.c
@@ -144,7 +144,7 @@ ethernet_build_rewrite (vnet_main_t * vnm,
vec_validate (rewrite, n_bytes - 1);
h = (ethernet_header_t *) rewrite;
ei = pool_elt_at_index (em->interfaces, hw->hw_instance);
- clib_memcpy (h->src_address, ei->address, sizeof (h->src_address));
+ clib_memcpy (h->src_address, &ei->address, sizeof (h->src_address));
if (is_p2p)
{
clib_memcpy (h->dst_address, sub_sw->p2p.client_mac,
@@ -268,6 +268,27 @@ ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
}
}
+static void
+ethernet_interface_address_copy (ethernet_interface_address_t * dst,
+ const u8 * mac)
+{
+ clib_memcpy (&dst->mac, (u8 *) mac, sizeof (dst->mac));
+ /*
+ * ethernet dataplane loads mac as u64, makes sure the last 2 bytes are 0
+ * for comparison purpose
+ */
+ dst->zero = 0;
+}
+
+static void
+ethernet_set_mac (vnet_hw_interface_t * hi, ethernet_interface_t * ei,
+ const u8 * mac_address)
+{
+ vec_validate (hi->hw_address, sizeof (mac_address_t) - 1);
+ clib_memcpy (hi->hw_address, mac_address, sizeof (mac_address_t));
+ ethernet_interface_address_copy (&ei->address, mac_address);
+}
+
static clib_error_t *
ethernet_mac_change (vnet_hw_interface_t * hi,
const u8 * old_address, const u8 * mac_address)
@@ -278,11 +299,7 @@ ethernet_mac_change (vnet_hw_interface_t * hi,
em = &ethernet_main;
ei = pool_elt_at_index (em->interfaces, hi->hw_instance);
- vec_validate (hi->hw_address,
- STRUCT_SIZE_OF (ethernet_header_t, src_address) - 1);
- clib_memcpy (hi->hw_address, mac_address, vec_len (hi->hw_address));
-
- clib_memcpy (ei->address, (u8 *) mac_address, sizeof (ei->address));
+ ethernet_set_mac (hi, ei, mac_address);
{
ethernet_address_change_ctx_t *cb;
@@ -362,9 +379,7 @@ ethernet_register_interface (vnet_main_t * vnm,
/* 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));
- CLIB_MEM_UNPOISON (hi->hw_address, 8);
+ ethernet_set_mac (hi, ei, address);
if (error)
{
@@ -979,7 +994,8 @@ ethernet_interface_add_del_address (ethernet_main_t * em,
u8 is_add)
{
ethernet_interface_t *ei = ethernet_get_interface (em, hw_if_index);
- mac_address_t *if_addr = 0;
+ ethernet_interface_address_t *if_addr = 0;
+ int found = 0;
/* return if there is not an ethernet interface for this hw interface */
if (!ei)
@@ -988,36 +1004,29 @@ ethernet_interface_add_del_address (ethernet_main_t * em,
/* determine whether the address is configured on the interface */
vec_foreach (if_addr, ei->secondary_addrs)
{
- if (!ethernet_mac_address_equal (if_addr->bytes, address))
- continue;
-
- break;
+ if (ethernet_mac_address_equal (if_addr->mac.bytes, address))
+ {
+ found = 1;
+ break;
+ }
}
- if (if_addr && vec_is_member (ei->secondary_addrs, if_addr))
+ if (is_add)
{
- /* delete found address */
- if (!is_add)
- {
- vec_delete (ei->secondary_addrs, 1, if_addr - ei->secondary_addrs);
- if_addr = 0;
- }
- /* address already found, so nothing needs to be done if adding */
- }
- else
- {
- /* if_addr could be 0 or past the end of the vector. reset to 0 */
- if_addr = 0;
-
- /* add new address */
- if (is_add)
+ if (!found)
{
+ /* address not found yet: add it */
vec_add2 (ei->secondary_addrs, if_addr, 1);
- clib_memcpy (&if_addr->bytes, address, sizeof (if_addr->bytes));
+ ethernet_interface_address_copy (if_addr, address);
}
+ return &if_addr->mac;
}
- return if_addr;
+ /* delete case */
+ if (found)
+ vec_delete (ei->secondary_addrs, 1, if_addr - ei->secondary_addrs);
+
+ return 0;
}
int
diff --git a/src/vnet/ethernet/node.c b/src/vnet/ethernet/node.c
index 73e9eec71ae..efe7290d19a 100644
--- a/src/vnet/ethernet/node.c
+++ b/src/vnet/ethernet/node.c
@@ -694,9 +694,11 @@ ethernet_input_inline_dmac_check (vnet_hw_interface_t * hi,
u32 n_packets, ethernet_interface_t * ei,
u8 have_sec_dmac)
{
- u64 hwaddr = (*(u64 *) hi->hw_address) & DMAC_MASK;
+ u64 hwaddr = ei->address.as_u64;
u8 bad = 0;
+ ASSERT (0 == ei->address.zero);
+
dmacs_bad[0] = is_dmac_bad (dmacs[0], hwaddr);
dmacs_bad[1] = ((n_packets > 1) & is_dmac_bad (dmacs[1], hwaddr));
@@ -704,11 +706,12 @@ ethernet_input_inline_dmac_check (vnet_hw_interface_t * hi,
if (PREDICT_FALSE (bad && have_sec_dmac))
{
- mac_address_t *sec_addr;
+ ethernet_interface_address_t *sec_addr;
vec_foreach (sec_addr, ei->secondary_addrs)
{
- hwaddr = (*(u64 *) sec_addr) & DMAC_MASK;
+ ASSERT (0 == sec_addr->zero);
+ hwaddr = sec_addr->as_u64;
bad = (eth_input_sec_dmac_check_x1 (hwaddr, dmacs, dmacs_bad) |
eth_input_sec_dmac_check_x1 (hwaddr, dmacs + 1,
@@ -726,12 +729,14 @@ eth_input_process_frame_dmac_check (vnet_hw_interface_t * hi,
u32 n_packets, ethernet_interface_t * ei,
u8 have_sec_dmac)
{
- u64 hwaddr = (*(u64 *) hi->hw_address) & DMAC_MASK;
+ u64 hwaddr = ei->address.as_u64;
u64 *dmac = dmacs;
u8 *dmac_bad = dmacs_bad;
u32 bad = 0;
i32 n_left = n_packets;
+ ASSERT (0 == ei->address.zero);
+
#ifdef CLIB_HAVE_VEC256
while (n_left > 0)
{
@@ -760,15 +765,17 @@ eth_input_process_frame_dmac_check (vnet_hw_interface_t * hi,
if (have_sec_dmac && bad)
{
- mac_address_t *addr;
+ ethernet_interface_address_t *addr;
vec_foreach (addr, ei->secondary_addrs)
{
- u64 hwaddr = ((u64 *) addr)[0] & DMAC_MASK;
+ u64 hwaddr = addr->as_u64;
i32 n_left = n_packets;
u64 *dmac = dmacs;
u8 *dmac_bad = dmacs_bad;
+ ASSERT (0 == addr->zero);
+
bad = 0;
while (n_left > 0)