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tipc: implement configuration of UDP media MTU 

In previous commit, we changed the default emulated MTU for UDP bearers
to 14k.

This commit adds the functionality to set/change the default value
by configuring new MTU for UDP media. UDP bearer(s) have to be disabled
and enabled back for the new MTU to take effect.

Acked-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
GhantaKrishnamurthy MohanKrishna 2018-04-19 11:06:19 +02:00 committed by David S. Miller
parent a4dfa72d0a
commit 901271e040
4 changed files with 31 additions and 0 deletions
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1
include/uapi/linux/tipc_netlink.h
View File

@ -266,6 +266,7 @@ enum {
TIPC_NLA_PROP_PRIO, /* u32 */
TIPC_NLA_PROP_TOL, /* u32 */
TIPC_NLA_PROP_WIN, /* u32 */
TIPC_NLA_PROP_MTU, /* u32 */
__TIPC_NLA_PROP_MAX,
TIPC_NLA_PROP_MAX = __TIPC_NLA_PROP_MAX - 1

13
net/tipc/bearer.c
View File

@ -1029,6 +1029,9 @@ static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
goto prop_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
goto prop_msg_full;
if (media->type_id == TIPC_MEDIA_TYPE_UDP)
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
goto prop_msg_full;
nla_nest_end(msg->skb, prop);
nla_nest_end(msg->skb, attrs);
@ -1158,6 +1161,16 @@ int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
if (props[TIPC_NLA_PROP_WIN])
m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
if (props[TIPC_NLA_PROP_MTU]) {
if (m->type_id != TIPC_MEDIA_TYPE_UDP)
return -EINVAL;
#ifdef CONFIG_TIPC_MEDIA_UDP
if (tipc_udp_mtu_bad(nla_get_u32
(props[TIPC_NLA_PROP_MTU])))
return -EINVAL;
m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
#endif
}
}
return 0;

3
net/tipc/bearer.h
View File

@ -94,6 +94,8 @@ struct tipc_bearer;
* @priority: default link (and bearer) priority
* @tolerance: default time (in ms) before declaring link failure
* @window: default window (in packets) before declaring link congestion
* @mtu: max packet size bearer can support for media type not dependent on
* underlying device MTU
* @type_id: TIPC media identifier
* @hwaddr_len: TIPC media address len
* @name: media name
@ -118,6 +120,7 @@ struct tipc_media {
u32 priority;
u32 tolerance;
u32 window;
u32 mtu;
u32 type_id;
u32 hwaddr_len;
char name[TIPC_MAX_MEDIA_NAME];

14
net/tipc/udp_media.h
View File

@ -38,9 +38,23 @@
#ifndef _TIPC_UDP_MEDIA_H
#define _TIPC_UDP_MEDIA_H
#include <linux/ip.h>
#include <linux/udp.h>
int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr);
int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b);
int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb);
/* check if configured MTU is too low for tipc headers */
static inline bool tipc_udp_mtu_bad(u32 mtu)
{
if (mtu >= (TIPC_MIN_BEARER_MTU + sizeof(struct iphdr) +
sizeof(struct udphdr)))
return false;
pr_warn("MTU too low for tipc bearer\n");
return true;
}
#endif
#endif