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net/dcb: Add an optional max rate attribute 

Although not specified in 8021Qaz spec, it could be useful to enable drivers
whose HW supports setting a rate limit for an ETS TC. This patch adds this
optional attribute to DCB netlink. To use it, drivers should implement and
register the callbacks ieee_setmaxrate and ieee_getmaxrate. The units are 64
bits long and specified in Kbps to enable usage over both slow and very fast
networks.

Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amir Vadai 2012-04-04 21:33:30 +00:00 committed by David S. Miller
parent 366cddb402
commit 08f10affe4
3 changed files with 34 additions and 0 deletions
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12
include/linux/dcbnl.h
View File

@ -67,6 +67,17 @@ struct ieee_ets {
__u8 reco_prio_tc[IEEE_8021QAZ_MAX_TCS];
};
/* This structure contains rate limit extension to the IEEE 802.1Qaz ETS
* managed object.
* Values are 64 bits long and specified in Kbps to enable usage over both
* slow and very fast networks.
*
* @tc_maxrate: maximal tc tx bandwidth indexed by traffic class
*/
struct ieee_maxrate {
__u64 tc_maxrate[IEEE_8021QAZ_MAX_TCS];
};
/* This structure contains the IEEE 802.1Qaz PFC managed object
*
* @pfc_cap: Indicates the number of traffic classes on the local device
@ -321,6 +332,7 @@ enum ieee_attrs {
DCB_ATTR_IEEE_PEER_ETS,
DCB_ATTR_IEEE_PEER_PFC,
DCB_ATTR_IEEE_PEER_APP,
DCB_ATTR_IEEE_MAXRATE,
__DCB_ATTR_IEEE_MAX
};
#define DCB_ATTR_IEEE_MAX (__DCB_ATTR_IEEE_MAX - 1)

2
include/net/dcbnl.h
View File

@ -48,6 +48,8 @@ struct dcbnl_rtnl_ops {
/* IEEE 802.1Qaz std */
int (*ieee_getets) (struct net_device *, struct ieee_ets *);
int (*ieee_setets) (struct net_device *, struct ieee_ets *);
int (*ieee_getmaxrate) (struct net_device *, struct ieee_maxrate *);
int (*ieee_setmaxrate) (struct net_device *, struct ieee_maxrate *);
int (*ieee_getpfc) (struct net_device *, struct ieee_pfc *);
int (*ieee_setpfc) (struct net_device *, struct ieee_pfc *);
int (*ieee_getapp) (struct net_device *, struct dcb_app *);

20
net/dcb/dcbnl.c
View File

@ -178,6 +178,7 @@ static const struct nla_policy dcbnl_ieee_policy[DCB_ATTR_IEEE_MAX + 1] = {
[DCB_ATTR_IEEE_ETS] = {.len = sizeof(struct ieee_ets)},
[DCB_ATTR_IEEE_PFC] = {.len = sizeof(struct ieee_pfc)},
[DCB_ATTR_IEEE_APP_TABLE] = {.type = NLA_NESTED},
[DCB_ATTR_IEEE_MAXRATE] = {.len = sizeof(struct ieee_maxrate)},
};
static const struct nla_policy dcbnl_ieee_app[DCB_ATTR_IEEE_APP_MAX + 1] = {
@ -1246,6 +1247,17 @@ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
goto nla_put_failure;
}
if (ops->ieee_getmaxrate) {
struct ieee_maxrate maxrate;
err = ops->ieee_getmaxrate(netdev, &maxrate);
if (!err) {
err = nla_put(skb, DCB_ATTR_IEEE_MAXRATE,
sizeof(maxrate), &maxrate);
if (err)
goto nla_put_failure;
}
}
if (ops->ieee_getpfc) {
struct ieee_pfc pfc;
err = ops->ieee_getpfc(netdev, &pfc);
@ -1601,6 +1613,14 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlattr **tb,
goto err;
}
if (ieee[DCB_ATTR_IEEE_MAXRATE] && ops->ieee_setmaxrate) {
struct ieee_maxrate *maxrate =
nla_data(ieee[DCB_ATTR_IEEE_MAXRATE]);
err = ops->ieee_setmaxrate(netdev, maxrate);
if (err)
goto err;
}
if (ieee[DCB_ATTR_IEEE_PFC] && ops->ieee_setpfc) {
struct ieee_pfc *pfc = nla_data(ieee[DCB_ATTR_IEEE_PFC]);
err = ops->ieee_setpfc(netdev, pfc);