Commit bf797471 authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

devlink: add shared buffer configuration 



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: default avatarJiri Pirko <jiri@mellanox.com>
Reviewed-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f38ba953

include/net/devlink.h

+47 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ struct devlink_ops; 
struct devlink {

	struct list_head list;

	struct list_head port_list;

	struct list_head sb_list;

	const struct devlink_ops *ops;

	struct device *dev;

	possible_net_t _net;
@@ -42,6 +43,12 @@ struct devlink_port { 
	u32 split_group;

};



struct devlink_sb_pool_info {

	enum devlink_sb_pool_type pool_type;

	u32 size;

	enum devlink_sb_threshold_type threshold_type;

};



struct devlink_ops {

	size_t priv_size;

	int (*port_type_set)(struct devlink_port *devlink_port,
@@ -49,6 +56,28 @@ struct devlink_ops { 
	int (*port_split)(struct devlink *devlink, unsigned int port_index,

			  unsigned int count);

	int (*port_unsplit)(struct devlink *devlink, unsigned int port_index);

	int (*sb_pool_get)(struct devlink *devlink, unsigned int sb_index,

			   u16 pool_index,

			   struct devlink_sb_pool_info *pool_info);

	int (*sb_pool_set)(struct devlink *devlink, unsigned int sb_index,

			   u16 pool_index, u32 size,

			   enum devlink_sb_threshold_type threshold_type);

	int (*sb_port_pool_get)(struct devlink_port *devlink_port,

				unsigned int sb_index, u16 pool_index,

				u32 *p_threshold);

	int (*sb_port_pool_set)(struct devlink_port *devlink_port,

				unsigned int sb_index, u16 pool_index,

				u32 threshold);

	int (*sb_tc_pool_bind_get)(struct devlink_port *devlink_port,

				   unsigned int sb_index,

				   u16 tc_index,

				   enum devlink_sb_pool_type pool_type,

				   u16 *p_pool_index, u32 *p_threshold);

	int (*sb_tc_pool_bind_set)(struct devlink_port *devlink_port,

				   unsigned int sb_index,

				   u16 tc_index,

				   enum devlink_sb_pool_type pool_type,

				   u16 pool_index, u32 threshold);

};



static inline void *devlink_priv(struct devlink *devlink)
@@ -82,6 +111,11 @@ void devlink_port_type_ib_set(struct devlink_port *devlink_port, 
void devlink_port_type_clear(struct devlink_port *devlink_port);

void devlink_port_split_set(struct devlink_port *devlink_port,

			    u32 split_group);

int devlink_sb_register(struct devlink *devlink, unsigned int sb_index,

			u32 size, u16 ingress_pools_count,

			u16 egress_pools_count, u16 ingress_tc_count,

			u16 egress_tc_count);

void devlink_sb_unregister(struct devlink *devlink, unsigned int sb_index);



#else
@@ -135,6 +169,19 @@ static inline void devlink_port_split_set(struct devlink_port *devlink_port, 
{

}



static inline int devlink_sb_register(struct devlink *devlink,

				      unsigned int sb_index, u32 size,

				      u16 ingress_pools_count,

				      u16 egress_pools_count, u16 tc_count)

{

	return 0;

}



static inline void devlink_sb_unregister(struct devlink *devlink,

					 unsigned int sb_index)

{

}



#endif



#endif /* _NET_DEVLINK_H_ */

include/uapi/linux/devlink.h

+57 −0
Original line number Diff line number Diff line
@@ -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 */

net/core/devlink.c

+940 −0

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