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devlink: Allow setting tx rate for devlink rate leaf objects

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Implement support for DEVLINK_CMD_RATE_SET command with new attributes
DEVLINK_ATTR_RATE_TX_{SHARE|MAX} that are used to set devlink rate
shared/max tx rate values. Extend devlink ops with new callbacks
rate_leaf_tx_{share|max}_set() to allow supporting drivers to implement
rate control through devlink.

New attributes are optional. Driver implementations are allowed to
support either or both of them.

Shared rate example:

$ devlink port function rate set netdevsim/netdevsim10/0 tx_share 10mbit

$ devlink port function rate show netdevsim/netdevsim10/0
netdevsim/netdevsim10/0: type leaf tx_share 10mbit

Max rate example:

$ devlink port function rate set netdevsim/netdevsim10/0 tx_max 100mbit

$ devlink port function rate show netdevsim/netdevsim10/0
netdevsim/netdevsim10/0: type leaf tx_max 100mbit

Co-developed-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmytro Linkin 2021-06-02 15:17:22 +03:00 • committed by David S. Miller
parent a27d8e352b
commit 1897db2ec3
3 changed files with 98 additions and 0 deletions
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2
include/uapi/linux/devlink.h
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@ -545,6 +545,8 @@ enum devlink_attr {
DEVLINK_ATTR_PORT_PCI_SF_NUMBER, /* u32 */
DEVLINK_ATTR_RATE_TYPE, /* u16 */
DEVLINK_ATTR_RATE_TX_SHARE, /* u64 */
DEVLINK_ATTR_RATE_TX_MAX, /* u64 */
/* add new attributes above here, update the policy in devlink.c */
__DEVLINK_ATTR_MAX,