[PATCH net-next V3 3/8] devlink: Extend devlink rate API with traffic classes bandwidth management
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STALE701d
SUPERSEDED: 1 (0M)
From: Tariq Toukan <tariqt@nvidia.com>
Date: 2024-11-17 20:52:04
Subsystem:
devlink, networking [general], the rest, yaml netlink (ynl) · Maintainers:
Jiri Pirko, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Donald Hunter
Revision v3 of 6 in this series; 1 review trailer.
Revisions (6)
From: Carolina Jubran <redacted> Introduce support for specifying bandwidth proportions between traffic classes (TC) in the devlink-rate API. This new option allows users to allocate bandwidth across multiple traffic classes in a single command. This feature provides a more granular control over traffic management, especially for scenarios requiring Enhanced Transmission Selection. Users can now define a specific bandwidth share for each traffic class, such as allocating 20% for TC0 (TCP/UDP) and 80% for TC5 (RoCE). Example: DEV=pci/0000:08:00.0 $ devlink port function rate add $DEV/vfs_group tx_share 10Gbit \ tx_max 50Gbit tc-bw 0:20 1:0 2:0 3:0 4:0 5:80 6:0 7:0 $ devlink port function rate set $DEV/vfs_group \ tc-bw 0:20 1:0 2:0 3:0 4:0 5:20 6:60 7:0 Signed-off-by: Carolina Jubran <redacted> Reviewed-by: Cosmin Ratiu <redacted> Signed-off-by: Tariq Toukan <tariqt@nvidia.com> --- Documentation/netlink/specs/devlink.yaml | 22 ++++++++ include/net/devlink.h | 7 +++ include/uapi/linux/devlink.h | 3 + net/devlink/netlink_gen.c | 14 +++-- net/devlink/netlink_gen.h | 1 + net/devlink/rate.c | 71 +++++++++++++++++++++++- 6 files changed, 113 insertions(+), 5 deletions(-)
diff --git a/Documentation/netlink/specs/devlink.yaml b/Documentation/netlink/specs/devlink.yaml
index 09fbb4c03fc8..fece78ed60fe 100644
--- a/Documentation/netlink/specs/devlink.yaml
+++ b/Documentation/netlink/specs/devlink.yaml@@ -820,6 +820,19 @@ attribute-sets: - name: region-direct type: flag + - + name: rate-tc-bw + type: u32 + doc: | + Specifies the bandwidth allocation for the Traffic Class as a + percentage. + checks: + min: 0 + max: 100 + - + name: rate-tc-bw-values + type: nest + nested-attributes: dl-rate-tc-bw-values - name: dl-dev-stats
@@ -1225,6 +1238,13 @@ attribute-sets: - name: flash type: flag + - + name: dl-rate-tc-bw-values + subset-of: devlink + attributes: + - + name: rate-tc-bw + type: u32 operations: enum-model: directional
@@ -2149,6 +2169,7 @@ operations: - rate-tx-priority - rate-tx-weight - rate-parent-node-name + - rate-tc-bw-values - name: rate-new
@@ -2169,6 +2190,7 @@ operations: - rate-tx-priority - rate-tx-weight - rate-parent-node-name + - rate-tc-bw-values - name: rate-del
diff --git a/include/net/devlink.h b/include/net/devlink.h
index fbb9a2668e24..277b826cdd60 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h@@ -20,6 +20,7 @@ #include <uapi/linux/devlink.h> #include <linux/xarray.h> #include <linux/firmware.h> +#include <linux/dcbnl.h> struct devlink; struct devlink_linecard;
@@ -117,6 +118,8 @@ struct devlink_rate { u32 tx_priority; u32 tx_weight; + + u32 tc_bw[IEEE_8021QAZ_MAX_TCS]; }; struct devlink_port {
@@ -1469,6 +1472,8 @@ struct devlink_ops { u32 tx_priority, struct netlink_ext_ack *extack); int (*rate_leaf_tx_weight_set)(struct devlink_rate *devlink_rate, void *priv, u32 tx_weight, struct netlink_ext_ack *extack); + int (*rate_leaf_tc_bw_set)(struct devlink_rate *devlink_rate, void *priv, + u32 *tc_bw, struct netlink_ext_ack *extack); int (*rate_node_tx_share_set)(struct devlink_rate *devlink_rate, void *priv, u64 tx_share, struct netlink_ext_ack *extack); int (*rate_node_tx_max_set)(struct devlink_rate *devlink_rate, void *priv,
@@ -1477,6 +1482,8 @@ struct devlink_ops { u32 tx_priority, struct netlink_ext_ack *extack); int (*rate_node_tx_weight_set)(struct devlink_rate *devlink_rate, void *priv, u32 tx_weight, struct netlink_ext_ack *extack); + int (*rate_node_tc_bw_set)(struct devlink_rate *devlink_rate, void *priv, + u32 *tc_bw, struct netlink_ext_ack *extack); int (*rate_node_new)(struct devlink_rate *rate_node, void **priv, struct netlink_ext_ack *extack); int (*rate_node_del)(struct devlink_rate *rate_node, void *priv,
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 9401aa343673..0940f8770319 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h@@ -614,6 +614,9 @@ enum devlink_attr { DEVLINK_ATTR_REGION_DIRECT, /* flag */ + DEVLINK_ATTR_RATE_TC_BW, /* u32 */ + DEVLINK_ATTR_RATE_TC_BW_VALUES, /* nested */ + /* Add new attributes above here, update the spec in * Documentation/netlink/specs/devlink.yaml and re-generate * net/devlink/netlink_gen.c.
diff --git a/net/devlink/netlink_gen.c b/net/devlink/netlink_gen.c
index f9786d51f68f..231c2752538f 100644
--- a/net/devlink/netlink_gen.c
+++ b/net/devlink/netlink_gen.c@@ -18,6 +18,10 @@ const struct nla_policy devlink_dl_port_function_nl_policy[DEVLINK_PORT_FN_ATTR_ [DEVLINK_PORT_FN_ATTR_CAPS] = NLA_POLICY_BITFIELD32(15), }; +const struct nla_policy devlink_dl_rate_tc_bw_values_nl_policy[DEVLINK_ATTR_RATE_TC_BW + 1] = { + [DEVLINK_ATTR_RATE_TC_BW] = NLA_POLICY_RANGE(NLA_U32, 0, 100), +}; + const struct nla_policy devlink_dl_selftest_id_nl_policy[DEVLINK_ATTR_SELFTEST_ID_FLASH + 1] = { [DEVLINK_ATTR_SELFTEST_ID_FLASH] = { .type = NLA_FLAG, }, };
@@ -496,7 +500,7 @@ static const struct nla_policy devlink_rate_get_dump_nl_policy[DEVLINK_ATTR_DEV_ }; /* DEVLINK_CMD_RATE_SET - do */ -static const struct nla_policy devlink_rate_set_nl_policy[DEVLINK_ATTR_RATE_TX_WEIGHT + 1] = { +static const struct nla_policy devlink_rate_set_nl_policy[DEVLINK_ATTR_RATE_TC_BW_VALUES + 1] = { [DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, }, [DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, }, [DEVLINK_ATTR_RATE_NODE_NAME] = { .type = NLA_NUL_STRING, },
@@ -505,10 +509,11 @@ static const struct nla_policy devlink_rate_set_nl_policy[DEVLINK_ATTR_RATE_TX_W [DEVLINK_ATTR_RATE_TX_PRIORITY] = { .type = NLA_U32, }, [DEVLINK_ATTR_RATE_TX_WEIGHT] = { .type = NLA_U32, }, [DEVLINK_ATTR_RATE_PARENT_NODE_NAME] = { .type = NLA_NUL_STRING, }, + [DEVLINK_ATTR_RATE_TC_BW_VALUES] = NLA_POLICY_NESTED(devlink_dl_rate_tc_bw_values_nl_policy), }; /* DEVLINK_CMD_RATE_NEW - do */ -static const struct nla_policy devlink_rate_new_nl_policy[DEVLINK_ATTR_RATE_TX_WEIGHT + 1] = { +static const struct nla_policy devlink_rate_new_nl_policy[DEVLINK_ATTR_RATE_TC_BW_VALUES + 1] = { [DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, }, [DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, }, [DEVLINK_ATTR_RATE_NODE_NAME] = { .type = NLA_NUL_STRING, },
@@ -517,6 +522,7 @@ static const struct nla_policy devlink_rate_new_nl_policy[DEVLINK_ATTR_RATE_TX_W [DEVLINK_ATTR_RATE_TX_PRIORITY] = { .type = NLA_U32, }, [DEVLINK_ATTR_RATE_TX_WEIGHT] = { .type = NLA_U32, }, [DEVLINK_ATTR_RATE_PARENT_NODE_NAME] = { .type = NLA_NUL_STRING, }, + [DEVLINK_ATTR_RATE_TC_BW_VALUES] = NLA_POLICY_NESTED(devlink_dl_rate_tc_bw_values_nl_policy), }; /* DEVLINK_CMD_RATE_DEL - do */
@@ -1164,7 +1170,7 @@ const struct genl_split_ops devlink_nl_ops[74] = { .doit = devlink_nl_rate_set_doit, .post_doit = devlink_nl_post_doit, .policy = devlink_rate_set_nl_policy, - .maxattr = DEVLINK_ATTR_RATE_TX_WEIGHT, + .maxattr = DEVLINK_ATTR_RATE_TC_BW_VALUES, .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, }, {
@@ -1174,7 +1180,7 @@ const struct genl_split_ops devlink_nl_ops[74] = { .doit = devlink_nl_rate_new_doit, .post_doit = devlink_nl_post_doit, .policy = devlink_rate_new_nl_policy, - .maxattr = DEVLINK_ATTR_RATE_TX_WEIGHT, + .maxattr = DEVLINK_ATTR_RATE_TC_BW_VALUES, .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, }, {
diff --git a/net/devlink/netlink_gen.h b/net/devlink/netlink_gen.h
index 8f2bd50ddf5e..a8f0f20f6f0b 100644
--- a/net/devlink/netlink_gen.h
+++ b/net/devlink/netlink_gen.h@@ -13,6 +13,7 @@ /* Common nested types */ extern const struct nla_policy devlink_dl_port_function_nl_policy[DEVLINK_PORT_FN_ATTR_CAPS + 1]; +extern const struct nla_policy devlink_dl_rate_tc_bw_values_nl_policy[DEVLINK_ATTR_RATE_TC_BW + 1]; extern const struct nla_policy devlink_dl_selftest_id_nl_policy[DEVLINK_ATTR_SELFTEST_ID_FLASH + 1]; /* Ops table for devlink */
diff --git a/net/devlink/rate.c b/net/devlink/rate.c
index 8828ffaf6cbc..4eb0598d40f9 100644
--- a/net/devlink/rate.c
+++ b/net/devlink/rate.c@@ -86,7 +86,9 @@ static int devlink_nl_rate_fill(struct sk_buff *msg, int flags, struct netlink_ext_ack *extack) { struct devlink *devlink = devlink_rate->devlink; + struct nlattr *nla_tc_bw; void *hdr; + int i; hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd); if (!hdr)
@@ -129,6 +131,19 @@ static int devlink_nl_rate_fill(struct sk_buff *msg, devlink_rate->parent->name)) goto nla_put_failure; + nla_tc_bw = nla_nest_start(msg, DEVLINK_ATTR_RATE_TC_BW_VALUES); + if (!nla_tc_bw) + goto nla_put_failure; + + for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) { + if (nla_put_u32(msg, DEVLINK_ATTR_RATE_TC_BW, devlink_rate->tc_bw[i])) { + nla_nest_cancel(msg, nla_tc_bw); + goto nla_put_failure; + } + } + + nla_nest_end(msg, nla_tc_bw); + genlmsg_end(msg, hdr); return 0;
@@ -316,11 +331,46 @@ devlink_nl_rate_parent_node_set(struct devlink_rate *devlink_rate, return 0; } +static int devlink_nl_rate_tc_bw_set(struct devlink_rate *devlink_rate, + struct genl_info *info, + struct nlattr *nla_tc_bw) +{ + struct devlink *devlink = devlink_rate->devlink; + const struct devlink_ops *ops = devlink->ops; + u32 tc_bw[IEEE_8021QAZ_MAX_TCS] = {0}; + struct nlattr *nla_tc_entry; + int rem, err = 0, i = 0; + + nla_for_each_nested(nla_tc_entry, nla_tc_bw, rem) { + if (i >= IEEE_8021QAZ_MAX_TCS || nla_type(nla_tc_entry) != DEVLINK_ATTR_RATE_TC_BW) + return -EINVAL; + + tc_bw[i++] = nla_get_u32(nla_tc_entry); + } + + if (i != IEEE_8021QAZ_MAX_TCS) + return -EINVAL; + + if (devlink_rate_is_leaf(devlink_rate)) + err = ops->rate_leaf_tc_bw_set(devlink_rate, devlink_rate->priv, tc_bw, + info->extack); + else if (devlink_rate_is_node(devlink_rate)) + err = ops->rate_node_tc_bw_set(devlink_rate, devlink_rate->priv, tc_bw, + info->extack); + + if (err) + return err; + + memcpy(devlink_rate->tc_bw, tc_bw, sizeof(tc_bw)); + + return 0; +} + static int devlink_nl_rate_set(struct devlink_rate *devlink_rate, const struct devlink_ops *ops, struct genl_info *info) { - struct nlattr *nla_parent, **attrs = info->attrs; + struct nlattr *nla_parent, *nla_tc_bw, **attrs = info->attrs; int err = -EOPNOTSUPP; u32 priority; u32 weight;
@@ -380,6 +430,13 @@ static int devlink_nl_rate_set(struct devlink_rate *devlink_rate, devlink_rate->tx_weight = weight; } + nla_tc_bw = attrs[DEVLINK_ATTR_RATE_TC_BW_VALUES]; + if (nla_tc_bw) { + err = devlink_nl_rate_tc_bw_set(devlink_rate, info, nla_tc_bw); + if (err) + return err; + } + nla_parent = attrs[DEVLINK_ATTR_RATE_PARENT_NODE_NAME]; if (nla_parent) { err = devlink_nl_rate_parent_node_set(devlink_rate, info,
@@ -423,6 +480,12 @@ static bool devlink_rate_set_ops_supported(const struct devlink_ops *ops, "TX weight set isn't supported for the leafs"); return false; } + if (attrs[DEVLINK_ATTR_RATE_TC_BW_VALUES] && !ops->rate_leaf_tc_bw_set) { + NL_SET_ERR_MSG_ATTR(info->extack, + attrs[DEVLINK_ATTR_RATE_TC_BW_VALUES], + "TC bandwidth set isn't supported for the leafs"); + return false; + } } else if (type == DEVLINK_RATE_TYPE_NODE) { if (attrs[DEVLINK_ATTR_RATE_TX_SHARE] && !ops->rate_node_tx_share_set) { NL_SET_ERR_MSG(info->extack, "TX share set isn't supported for the nodes");
@@ -449,6 +512,12 @@ static bool devlink_rate_set_ops_supported(const struct devlink_ops *ops, "TX weight set isn't supported for the nodes"); return false; } + if (attrs[DEVLINK_ATTR_RATE_TC_BW_VALUES] && !ops->rate_node_tc_bw_set) { + NL_SET_ERR_MSG_ATTR(info->extack, + attrs[DEVLINK_ATTR_RATE_TC_BW_VALUES], + "TC bandwidth set isn't supported for the nodes"); + return false; + } } else { WARN(1, "Unknown type of rate object"); return false;
--
2.44.0