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devlink: add shared buffer configuration

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Define userspace API and drivers API for configuration of shared
buffers. Four basic objects are defined:
shared buffer - attributes are size, number of pools and TCs
pool - chunk of sharedbuffer definition, it has some size and either
       static or dynamic threshold
port pool threshold - to set per-port threshold for each pool
port tc threshold bind - to bind port and TC to specified pool
                         with threshold.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
2016-04-14 18:19:13 +02:00
committed by David S. Miller
parent f38ba953be
commit bf7974710a
3 changed files with 1044 additions and 0 deletions
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57
include/uapi/linux/devlink.h
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@@ -33,6 +33,26 @@ enum devlink_command {
DEVLINK_CMD_PORT_SPLIT,
DEVLINK_CMD_PORT_UNSPLIT,
DEVLINK_CMD_SB_GET, /* can dump */
DEVLINK_CMD_SB_SET,
DEVLINK_CMD_SB_NEW,
DEVLINK_CMD_SB_DEL,
DEVLINK_CMD_SB_POOL_GET, /* can dump */
DEVLINK_CMD_SB_POOL_SET,
DEVLINK_CMD_SB_POOL_NEW,
DEVLINK_CMD_SB_POOL_DEL,
DEVLINK_CMD_SB_PORT_POOL_GET, /* can dump */
DEVLINK_CMD_SB_PORT_POOL_SET,
DEVLINK_CMD_SB_PORT_POOL_NEW,
DEVLINK_CMD_SB_PORT_POOL_DEL,
DEVLINK_CMD_SB_TC_POOL_BIND_GET, /* can dump */
DEVLINK_CMD_SB_TC_POOL_BIND_SET,
DEVLINK_CMD_SB_TC_POOL_BIND_NEW,
DEVLINK_CMD_SB_TC_POOL_BIND_DEL,
/* add new commands above here */
__DEVLINK_CMD_MAX,
@@ -46,6 +66,31 @@ enum devlink_port_type {
DEVLINK_PORT_TYPE_IB,
};
enum devlink_sb_pool_type {
DEVLINK_SB_POOL_TYPE_INGRESS,
DEVLINK_SB_POOL_TYPE_EGRESS,
};
/* static threshold - limiting the maximum number of bytes.
* dynamic threshold - limiting the maximum number of bytes
* based on the currently available free space in the shared buffer pool.
* In this mode, the maximum quota is calculated based
* on the following formula:
* max_quota = alpha / (1 + alpha) * Free_Buffer
* While Free_Buffer is the amount of none-occupied buffer associated to
* the relevant pool.
* The value range which can be passed is 0-20 and serves
* for computation of alpha by following formula:
* alpha = 2 ^ (passed_value - 10)
*/
enum devlink_sb_threshold_type {
DEVLINK_SB_THRESHOLD_TYPE_STATIC,
DEVLINK_SB_THRESHOLD_TYPE_DYNAMIC,
};
#define DEVLINK_SB_THRESHOLD_TO_ALPHA_MAX 20
enum devlink_attr {
/* don't change the order or add anything between, this is ABI! */
DEVLINK_ATTR_UNSPEC,
@@ -62,6 +107,18 @@ enum devlink_attr {
DEVLINK_ATTR_PORT_IBDEV_NAME, /* string */
DEVLINK_ATTR_PORT_SPLIT_COUNT, /* u32 */
DEVLINK_ATTR_PORT_SPLIT_GROUP, /* u32 */
DEVLINK_ATTR_SB_INDEX, /* u32 */
DEVLINK_ATTR_SB_SIZE, /* u32 */
DEVLINK_ATTR_SB_INGRESS_POOL_COUNT, /* u16 */
DEVLINK_ATTR_SB_EGRESS_POOL_COUNT, /* u16 */
DEVLINK_ATTR_SB_INGRESS_TC_COUNT, /* u16 */
DEVLINK_ATTR_SB_EGRESS_TC_COUNT, /* u16 */
DEVLINK_ATTR_SB_POOL_INDEX, /* u16 */
DEVLINK_ATTR_SB_POOL_TYPE, /* u8 */
DEVLINK_ATTR_SB_POOL_SIZE, /* u32 */
DEVLINK_ATTR_SB_POOL_THRESHOLD_TYPE, /* u8 */
DEVLINK_ATTR_SB_THRESHOLD, /* u32 */
DEVLINK_ATTR_SB_TC_INDEX, /* u16 */
/* add new attributes above here, update the policy in devlink.c */