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: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 57 insertions, 0 deletions

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index c9fee5781eb1..9c1aa5783090 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -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 */