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net/dcb: Add an optional max rate attribute

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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
commit 08f10affe4
3 changed files with 34 additions and 0 deletions
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12
include/linux/dcbnl.h
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@ -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)