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ofproto: Improve terminology.
[openvswitch]
/
datapath
/
vport-gre.c
diff --git
a/datapath/vport-gre.c
b/datapath/vport-gre.c
index 98e0abc3b7d494793a47a0a5d43328c590fb3fbc..2bddc871093205c6442a24e4954c5bd538b47693 100644
(file)
--- a/
datapath/vport-gre.c
+++ b/
datapath/vport-gre.c
@@
-44,6
+44,11
@@
* number of options. */
#define GRE_HEADER_SECTION 4
* number of options. */
#define GRE_HEADER_SECTION 4
+struct gre_base_hdr {
+ __be16 flags;
+ __be16 protocol;
+};
+
struct mutable_config {
struct rcu_head rcu;
struct mutable_config {
struct rcu_head rcu;
@@
-55,6
+60,7
@@
struct mutable_config {
};
struct gre_vport {
};
struct gre_vport {
+ struct rcu_head rcu;
struct tbl_node tbl_node;
char name[IFNAMSIZ];
struct tbl_node tbl_node;
char name[IFNAMSIZ];
@@
-74,34
+80,30
@@
static unsigned int key_remote_ports;
static unsigned int local_remote_ports;
static unsigned int remote_ports;
static unsigned int local_remote_ports;
static unsigned int remote_ports;
-static inline struct gre_vport *
-gre_vport_priv(const struct vport *vport)
+static inline struct gre_vport *gre_vport_priv(const struct vport *vport)
{
return vport_priv(vport);
}
{
return vport_priv(vport);
}
-static inline struct vport *
-gre_vport_to_vport(const struct gre_vport *gre_vport)
+static inline struct vport *gre_vport_to_vport(const struct gre_vport *gre_vport)
{
return vport_from_priv(gre_vport);
}
{
return vport_from_priv(gre_vport);
}
-static inline struct gre_vport *
-gre_vport_table_cast(const struct tbl_node *node)
+static inline struct gre_vport *gre_vport_table_cast(const struct tbl_node *node)
{
return container_of(node, struct gre_vport, tbl_node);
}
/* RCU callback. */
{
return container_of(node, struct gre_vport, tbl_node);
}
/* RCU callback. */
-static void
-free_config(struct rcu_head *rcu)
+static void free_config(struct rcu_head *rcu)
{
struct mutable_config *c = container_of(rcu, struct mutable_config, rcu);
kfree(c);
}
{
struct mutable_config *c = container_of(rcu, struct mutable_config, rcu);
kfree(c);
}
-static void
-
assign_config_rcu(struct vport *vport,
struct mutable_config *new_config)
+static void
assign_config_rcu(struct vport *vport,
+
struct mutable_config *new_config)
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct mutable_config *old_config;
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct mutable_config *old_config;
@@
-111,8
+113,7
@@
assign_config_rcu(struct vport *vport, struct mutable_config *new_config)
call_rcu(&old_config->rcu, free_config);
}
call_rcu(&old_config->rcu, free_config);
}
-static unsigned int *
-find_port_pool(const struct mutable_config *mutable)
+static unsigned int *find_port_pool(const struct mutable_config *mutable)
{
if (mutable->port_config.flags & GRE_F_IN_KEY_MATCH) {
if (mutable->port_config.saddr)
{
if (mutable->port_config.flags & GRE_F_IN_KEY_MATCH) {
if (mutable->port_config.saddr)
@@
-141,8
+142,7
@@
struct port_lookup_key {
/* Modifies 'target' to store the rcu_dereferenced pointer that was used to do
* the comparision. */
/* Modifies 'target' to store the rcu_dereferenced pointer that was used to do
* the comparision. */
-static int
-port_cmp(const struct tbl_node *node, void *target)
+static int port_cmp(const struct tbl_node *node, void *target)
{
const struct gre_vport *gre_vport = gre_vport_table_cast(node);
struct port_lookup_key *lookup = target;
{
const struct gre_vport *gre_vport = gre_vport_table_cast(node);
struct port_lookup_key *lookup = target;
@@
-156,14
+156,12
@@
port_cmp(const struct tbl_node *node, void *target)
lookup->mutable->port_config.saddr == lookup->vals[LOOKUP_SADDR];
}
lookup->mutable->port_config.saddr == lookup->vals[LOOKUP_SADDR];
}
-static u32
-port_hash(struct port_lookup_key *lookup)
+static u32 port_hash(struct port_lookup_key *lookup)
{
return jhash2(lookup->vals, ARRAY_SIZE(lookup->vals), 0);
}
{
return jhash2(lookup->vals, ARRAY_SIZE(lookup->vals), 0);
}
-static int
-add_port(struct vport *vport)
+static int add_port(struct vport *vport)
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct port_lookup_key lookup;
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct port_lookup_key lookup;
@@
-204,8
+202,7
@@
add_port(struct vport *vport)
return 0;
}
return 0;
}
-static int
-del_port(struct vport *vport)
+static int del_port(struct vport *vport)
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
int err;
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
int err;
@@
-223,9
+220,9
@@
del_port(struct vport *vport)
#define FIND_PORT_MATCH (1 << 1)
#define FIND_PORT_ANY (FIND_PORT_KEY | FIND_PORT_MATCH)
#define FIND_PORT_MATCH (1 << 1)
#define FIND_PORT_ANY (FIND_PORT_KEY | FIND_PORT_MATCH)
-static struct vport *
-
find_port(__be32 saddr, __be32 daddr, __be32 key,
int port_type,
- const struct mutable_config **mutable)
+static struct vport *
find_port(__be32 saddr, __be32 daddr, __be32 key,
+
int port_type,
+
const struct mutable_config **mutable)
{
struct port_lookup_key lookup;
struct tbl *table = rcu_dereference(port_table);
{
struct port_lookup_key lookup;
struct tbl *table = rcu_dereference(port_table);
@@
-284,8
+281,7
@@
found:
return gre_vport_to_vport(gre_vport_table_cast(tbl_node));
}
return gre_vport_to_vport(gre_vport_table_cast(tbl_node));
}
-static bool
-check_ipv4_address(__be32 addr)
+static bool check_ipv4_address(__be32 addr)
{
if (ipv4_is_multicast(addr) || ipv4_is_lbcast(addr)
|| ipv4_is_loopback(addr) || ipv4_is_zeronet(addr))
{
if (ipv4_is_multicast(addr) || ipv4_is_lbcast(addr)
|| ipv4_is_loopback(addr) || ipv4_is_zeronet(addr))
@@
-294,8
+290,7
@@
check_ipv4_address(__be32 addr)
return true;
}
return true;
}
-static bool
-ipv4_should_icmp(struct sk_buff *skb)
+static bool ipv4_should_icmp(struct sk_buff *skb)
{
struct iphdr *old_iph = ip_hdr(skb);
{
struct iphdr *old_iph = ip_hdr(skb);
@@
-335,9
+330,8
@@
ipv4_should_icmp(struct sk_buff *skb)
return true;
}
return true;
}
-static void
-ipv4_build_icmp(struct sk_buff *skb, struct sk_buff *nskb,
- unsigned int mtu, unsigned int payload_length)
+static void ipv4_build_icmp(struct sk_buff *skb, struct sk_buff *nskb,
+ unsigned int mtu, unsigned int payload_length)
{
struct iphdr *iph, *old_iph = ip_hdr(skb);
struct icmphdr *icmph;
{
struct iphdr *iph, *old_iph = ip_hdr(skb);
struct icmphdr *icmph;
@@
-378,8
+372,7
@@
ipv4_build_icmp(struct sk_buff *skb, struct sk_buff *nskb,
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-static bool
-ipv6_should_icmp(struct sk_buff *skb)
+static bool ipv6_should_icmp(struct sk_buff *skb)
{
struct ipv6hdr *old_ipv6h = ipv6_hdr(skb);
int addr_type;
{
struct ipv6hdr *old_ipv6h = ipv6_hdr(skb);
int addr_type;
@@
-415,9
+408,8
@@
ipv6_should_icmp(struct sk_buff *skb)
return true;
}
return true;
}
-static void
-ipv6_build_icmp(struct sk_buff *skb, struct sk_buff *nskb, unsigned int mtu,
- unsigned int payload_length)
+static void ipv6_build_icmp(struct sk_buff *skb, struct sk_buff *nskb,
+ unsigned int mtu, unsigned int payload_length)
{
struct ipv6hdr *ipv6h, *old_ipv6h = ipv6_hdr(skb);
struct icmp6hdr *icmp6h;
{
struct ipv6hdr *ipv6h, *old_ipv6h = ipv6_hdr(skb);
struct icmp6hdr *icmp6h;
@@
-455,9
+447,10
@@
ipv6_build_icmp(struct sk_buff *skb, struct sk_buff *nskb, unsigned int mtu,
}
#endif /* IPv6 */
}
#endif /* IPv6 */
-static bool
-send_frag_needed(struct vport *vport, const struct mutable_config *mutable,
- struct sk_buff *skb, unsigned int mtu, __be32 flow_key)
+static bool send_frag_needed(struct vport *vport,
+ const struct mutable_config *mutable,
+ struct sk_buff *skb, unsigned int mtu,
+ __be32 flow_key)
{
unsigned int eth_hdr_len = ETH_HLEN;
unsigned int total_length = 0, header_length = 0, payload_length;
{
unsigned int eth_hdr_len = ETH_HLEN;
unsigned int total_length = 0, header_length = 0, payload_length;
@@
-554,11
+547,10
@@
send_frag_needed(struct vport *vport, const struct mutable_config *mutable,
return true;
}
return true;
}
-static struct sk_buff *
-check_headroom(struct sk_buff *skb, int headroom)
+static struct sk_buff *check_headroom(struct sk_buff *skb, int headroom)
{
if (skb_headroom(skb) < headroom || skb_header_cloned(skb)) {
{
if (skb_headroom(skb) < headroom || skb_header_cloned(skb)) {
- struct sk_buff *nskb = skb_realloc_headroom(skb,
max(headroom, 64)
);
+ struct sk_buff *nskb = skb_realloc_headroom(skb,
headroom + 16
);
if (!nskb) {
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
if (!nskb) {
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
@@
-576,22
+568,21
@@
check_headroom(struct sk_buff *skb, int headroom)
return skb;
}
return skb;
}
-static void
-
create_gre_header(struct sk_buff *skb,
const struct mutable_config *mutable)
+static void
create_gre_header(struct sk_buff *skb,
+
const struct mutable_config *mutable)
{
struct iphdr *iph = ip_hdr(skb);
{
struct iphdr *iph = ip_hdr(skb);
- __be16 *flags = (__be16 *)(iph + 1);
- __be16 *protocol = flags + 1;
+ struct gre_base_hdr *greh = (struct gre_base_hdr *)(iph + 1);
__be32 *options = (__be32 *)((u8 *)iph + mutable->tunnel_hlen
- GRE_HEADER_SECTION);
__be32 *options = (__be32 *)((u8 *)iph + mutable->tunnel_hlen
- GRE_HEADER_SECTION);
-
*
protocol = htons(ETH_P_TEB);
-
*
flags = 0;
+
greh->
protocol = htons(ETH_P_TEB);
+
greh->
flags = 0;
/* Work backwards over the options so the checksum is last. */
if (mutable->port_config.out_key ||
mutable->port_config.flags & GRE_F_OUT_KEY_ACTION) {
/* Work backwards over the options so the checksum is last. */
if (mutable->port_config.out_key ||
mutable->port_config.flags & GRE_F_OUT_KEY_ACTION) {
-
*
flags |= GRE_KEY;
+
greh->
flags |= GRE_KEY;
if (mutable->port_config.flags & GRE_F_OUT_KEY_ACTION)
*options = OVS_CB(skb)->tun_id;
if (mutable->port_config.flags & GRE_F_OUT_KEY_ACTION)
*options = OVS_CB(skb)->tun_id;
@@
-602,7
+593,7
@@
create_gre_header(struct sk_buff *skb, const struct mutable_config *mutable)
}
if (mutable->port_config.flags & GRE_F_OUT_CSUM) {
}
if (mutable->port_config.flags & GRE_F_OUT_CSUM) {
-
*
flags |= GRE_CSUM;
+
greh->
flags |= GRE_CSUM;
*options = 0;
*(__sum16 *)options = csum_fold(skb_checksum(skb,
*options = 0;
*(__sum16 *)options = csum_fold(skb_checksum(skb,
@@
-612,8
+603,7
@@
create_gre_header(struct sk_buff *skb, const struct mutable_config *mutable)
}
}
}
}
-static int
-check_checksum(struct sk_buff *skb)
+static int check_checksum(struct sk_buff *skb)
{
struct iphdr *iph = ip_hdr(skb);
__be16 flags = *(__be16 *)(iph + 1);
{
struct iphdr *iph = ip_hdr(skb);
__be16 flags = *(__be16 *)(iph + 1);
@@
-639,31
+629,29
@@
check_checksum(struct sk_buff *skb)
return (csum == 0);
}
return (csum == 0);
}
-static int
-parse_gre_header(struct iphdr *iph, __be16 *flags, __be32 *key)
+static int parse_gre_header(struct iphdr *iph, __be16 *flags, __be32 *key)
{
/* IP and ICMP protocol handlers check that the IHL is valid. */
{
/* IP and ICMP protocol handlers check that the IHL is valid. */
- __be16 *flagsp = (__be16 *)((u8 *)iph + (iph->ihl << 2));
- __be16 *protocol = flagsp + 1;
- __be32 *options = (__be32 *)(protocol + 1);
+ struct gre_base_hdr *greh = (struct gre_base_hdr *)((u8 *)iph + (iph->ihl << 2));
+ __be32 *options = (__be32 *)(greh + 1);
int hdr_len;
int hdr_len;
- *flags =
*flagsp
;
+ *flags =
greh->flags
;
- if (
*
flags & (GRE_VERSION | GRE_ROUTING))
+ if (
greh->
flags & (GRE_VERSION | GRE_ROUTING))
return -EINVAL;
return -EINVAL;
- if (
*
protocol != htons(ETH_P_TEB))
+ if (
greh->
protocol != htons(ETH_P_TEB))
return -EINVAL;
hdr_len = GRE_HEADER_SECTION;
return -EINVAL;
hdr_len = GRE_HEADER_SECTION;
- if (
*
flags & GRE_CSUM) {
+ if (
greh->
flags & GRE_CSUM) {
hdr_len += GRE_HEADER_SECTION;
options++;
}
hdr_len += GRE_HEADER_SECTION;
options++;
}
- if (
*
flags & GRE_KEY) {
+ if (
greh->
flags & GRE_KEY) {
hdr_len += GRE_HEADER_SECTION;
*key = *options;
hdr_len += GRE_HEADER_SECTION;
*key = *options;
@@
-671,14
+659,13
@@
parse_gre_header(struct iphdr *iph, __be16 *flags, __be32 *key)
} else
*key = 0;
} else
*key = 0;
- if (
*
flags & GRE_SEQ)
+ if (
greh->
flags & GRE_SEQ)
hdr_len += GRE_HEADER_SECTION;
return hdr_len;
}
hdr_len += GRE_HEADER_SECTION;
return hdr_len;
}
-static inline u8
-ecn_encapsulate(u8 tos, struct sk_buff *skb)
+static inline u8 ecn_encapsulate(u8 tos, struct sk_buff *skb)
{
u8 inner;
{
u8 inner;
@@
-694,8
+681,7
@@
ecn_encapsulate(u8 tos, struct sk_buff *skb)
return INET_ECN_encapsulate(tos, inner);
}
return INET_ECN_encapsulate(tos, inner);
}
-static inline void
-ecn_decapsulate(u8 tos, struct sk_buff *skb)
+static inline void ecn_decapsulate(u8 tos, struct sk_buff *skb)
{
if (INET_ECN_is_ce(tos)) {
__be16 protocol = skb->protocol;
{
if (INET_ECN_is_ce(tos)) {
__be16 protocol = skb->protocol;
@@
-729,11
+715,10
@@
ecn_decapsulate(u8 tos, struct sk_buff *skb)
}
}
}
}
-static struct sk_buff *
-handle_gso(struct sk_buff *skb)
+static struct sk_buff *handle_gso(struct sk_buff *skb)
{
if (skb_is_gso(skb)) {
{
if (skb_is_gso(skb)) {
- struct sk_buff *nskb = skb_gso_segment(skb,
NETIF_F_SG
);
+ struct sk_buff *nskb = skb_gso_segment(skb,
0
);
dev_kfree_skb(skb);
return nskb;
dev_kfree_skb(skb);
return nskb;
@@
-742,8
+727,7
@@
handle_gso(struct sk_buff *skb)
return skb;
}
return skb;
}
-static int
-handle_csum_offload(struct sk_buff *skb)
+static int handle_csum_offload(struct sk_buff *skb)
{
if (skb->ip_summed == CHECKSUM_PARTIAL)
return skb_checksum_help(skb);
{
if (skb->ip_summed == CHECKSUM_PARTIAL)
return skb_checksum_help(skb);
@@
-754,8
+738,7
@@
handle_csum_offload(struct sk_buff *skb)
}
/* Called with rcu_read_lock. */
}
/* Called with rcu_read_lock. */
-static void
-gre_err(struct sk_buff *skb, u32 info)
+static void gre_err(struct sk_buff *skb, u32 info)
{
struct vport *vport;
const struct mutable_config *mutable;
{
struct vport *vport;
const struct mutable_config *mutable;
@@
-871,8
+854,7
@@
out:
}
/* Called with rcu_read_lock. */
}
/* Called with rcu_read_lock. */
-static int
-gre_rcv(struct sk_buff *skb)
+static int gre_rcv(struct sk_buff *skb)
{
struct vport *vport;
const struct mutable_config *mutable;
{
struct vport *vport;
const struct mutable_config *mutable;
@@
-937,10
+919,9
@@
error:
return 0;
}
return 0;
}
-static int
-build_packet(struct vport *vport, const struct mutable_config *mutable,
- struct iphdr *iph, struct rtable *rt, int max_headroom, int mtu,
- struct sk_buff *skb)
+static int build_packet(struct vport *vport, const struct mutable_config *mutable,
+ struct iphdr *iph, struct rtable *rt, int max_headroom,
+ int mtu, struct sk_buff *skb)
{
int err;
struct iphdr *new_iph;
{
int err;
struct iphdr *new_iph;
@@
-1014,8
+995,7
@@
error:
return 0;
}
return 0;
}
-static int
-gre_send(struct vport *vport, struct sk_buff *skb)
+static int gre_send(struct vport *vport, struct sk_buff *skb)
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
const struct mutable_config *mutable = rcu_dereference(gre_vport->mutable);
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
const struct mutable_config *mutable = rcu_dereference(gre_vport->mutable);
@@
-1131,7
+1111,9
@@
gre_send(struct vport *vport, struct sk_buff *skb)
}
forward_ip_summed(skb);
}
forward_ip_summed(skb);
- vswitch_skb_checksum_setup(skb);
+
+ if (unlikely(vswitch_skb_checksum_setup(skb)))
+ goto error_free;
skb = handle_gso(skb);
if (unlikely(IS_ERR(skb))) {
skb = handle_gso(skb);
if (unlikely(IS_ERR(skb))) {
@@
-1165,8
+1147,7
@@
static struct net_protocol gre_protocol_handlers = {
.err_handler = gre_err,
};
.err_handler = gre_err,
};
-static int
-gre_init(void)
+static int gre_init(void)
{
int err;
{
int err;
@@
-1177,16
+1158,14
@@
gre_init(void)
return err;
}
return err;
}
-static void
-gre_exit(void)
+static void gre_exit(void)
{
tbl_destroy(port_table, NULL);
inet_del_protocol(&gre_protocol_handlers, IPPROTO_GRE);
}
{
tbl_destroy(port_table, NULL);
inet_del_protocol(&gre_protocol_handlers, IPPROTO_GRE);
}
-static int
-set_config(const struct vport *cur_vport, struct mutable_config *mutable,
- const void __user *uconfig)
+static int set_config(const struct vport *cur_vport,
+ struct mutable_config *mutable, const void __user *uconfig)
{
const struct vport *old_vport;
const struct mutable_config *old_mutable;
{
const struct vport *old_vport;
const struct mutable_config *old_mutable;
@@
-1227,8
+1206,7
@@
set_config(const struct vport *cur_vport, struct mutable_config *mutable,
return 0;
}
return 0;
}
-static struct vport *
-gre_create(const char *name, const void __user *config)
+static struct vport *gre_create(const char *name, const void __user *config)
{
struct vport *vport;
struct gre_vport *gre_vport;
{
struct vport *vport;
struct gre_vport *gre_vport;
@@
-1271,8
+1249,7
@@
error:
return ERR_PTR(err);
}
return ERR_PTR(err);
}
-static int
-gre_modify(struct vport *vport, const void __user *config)
+static int gre_modify(struct vport *vport, const void __user *config)
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct mutable_config *mutable;
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct mutable_config *mutable;
@@
-1323,8
+1300,15
@@
error:
return err;
}
return err;
}
-static int
-gre_destroy(struct vport *vport)
+static void free_port(struct rcu_head *rcu)
+{
+ struct gre_vport *gre_vport = container_of(rcu, struct gre_vport, rcu);
+
+ kfree(gre_vport->mutable);
+ vport_free(gre_vport_to_vport(gre_vport));
+}
+
+static int gre_destroy(struct vport *vport)
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
int port_type;
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
int port_type;
@@
-1342,14
+1326,12
@@
gre_destroy(struct vport *vport)
gre_vport->mutable->port_config.in_key, port_type, &old_mutable))
del_port(vport);
gre_vport->mutable->port_config.in_key, port_type, &old_mutable))
del_port(vport);
- kfree(gre_vport->mutable);
- vport_free(vport);
+ call_rcu(&gre_vport->rcu, free_port);
return 0;
}
return 0;
}
-static int
-gre_set_mtu(struct vport *vport, int mtu)
+static int gre_set_mtu(struct vport *vport, int mtu)
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct mutable_config *mutable;
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct mutable_config *mutable;
@@
-1364,8
+1346,7
@@
gre_set_mtu(struct vport *vport, int mtu)
return 0;
}
return 0;
}
-static int
-gre_set_addr(struct vport *vport, const unsigned char *addr)
+static int gre_set_addr(struct vport *vport, const unsigned char *addr)
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct mutable_config *mutable;
{
struct gre_vport *gre_vport = gre_vport_priv(vport);
struct mutable_config *mutable;
@@
-1381,22
+1362,19
@@
gre_set_addr(struct vport *vport, const unsigned char *addr)
}
}
-static const char *
-gre_get_name(const struct vport *vport)
+static const char *gre_get_name(const struct vport *vport)
{
const struct gre_vport *gre_vport = gre_vport_priv(vport);
return gre_vport->name;
}
{
const struct gre_vport *gre_vport = gre_vport_priv(vport);
return gre_vport->name;
}
-static const unsigned char *
-gre_get_addr(const struct vport *vport)
+static const unsigned char *gre_get_addr(const struct vport *vport)
{
const struct gre_vport *gre_vport = gre_vport_priv(vport);
return rcu_dereference(gre_vport->mutable)->eth_addr;
}
{
const struct gre_vport *gre_vport = gre_vport_priv(vport);
return rcu_dereference(gre_vport->mutable)->eth_addr;
}
-static int
-gre_get_mtu(const struct vport *vport)
+static int gre_get_mtu(const struct vport *vport)
{
const struct gre_vport *gre_vport = gre_vport_priv(vport);
return rcu_dereference(gre_vport->mutable)->mtu;
{
const struct gre_vport *gre_vport = gre_vport_priv(vport);
return rcu_dereference(gre_vport->mutable)->mtu;