diff mbox series

[v7,net-next,10/15] net-shapers: implement cap validation in the core

Message ID b1b9a2ba1f8847b602f90102a0321a42ac9ff06f.1725919039.git.pabeni@redhat.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series net: introduce TX H/W shaping API | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next, async
netdev/ynl success Generated files up to date; no warnings/errors; GEN HAS DIFF 2 files changed, 1242 insertions(+);
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 7 this patch: 7
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 4 of 4 maintainers
netdev/build_clang success Errors and warnings before: 7 this patch: 7
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 7 this patch: 7
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 125 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest fail net-next-2024-09-10--21-00 (tests: 724)

Commit Message

Paolo Abeni Sept. 9, 2024, 10:10 p.m. UTC 
Use the device capabilities to reject invalid attribute values before
pushing them to the H/W.

Note that validating the metric explicitly avoids NL_SET_BAD_ATTR()
usage, to provide unambiguous error messages to the user.

Validating the nesting requires the knowledge of the new parent for
the given shaper; as such is a chicken-egg problem: to validate the
leaf nesting we need to know the node scope, to validate the node
nesting we need to know the leafs parent scope.

To break the circular dependency, place the leafs nesting validation
after the parsing.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
v6 -> v7:
  - validate the queue id vs real_num_tx_queues
  - some mangling upon rebase, as 'node' is now always not NULL
    in net_shaper_parse_leaf()
---
 net/shaper/shaper.c | 101 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
diff mbox series

Patch

diff --git a/net/shaper/shaper.c b/net/shaper/shaper.c
index cf282b26f9aa..8631e700a069 100644
--- a/net/shaper/shaper.c
+++ b/net/shaper/shaper.c
@@ -439,6 +439,74 @@  static int net_shaper_parse_handle(const struct nlattr *attr,
 	return 0;
 }
 
+static int net_shaper_validate_caps(struct net_shaper_binding *binding,
+				    struct nlattr **tb,
+				    const struct genl_info *info,
+				    struct net_shaper *shaper)
+{
+	const struct net_shaper_ops *ops = net_shaper_ops(binding);
+	struct nlattr *bad = NULL;
+	unsigned long caps = 0;
+
+	ops->capabilities(binding, shaper->handle.scope, &caps);
+
+	if (tb[NET_SHAPER_A_PRIORITY] &&
+	    !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_PRIORITY)))
+		bad = tb[NET_SHAPER_A_PRIORITY];
+	if (tb[NET_SHAPER_A_WEIGHT] &&
+	    !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_WEIGHT)))
+		bad = tb[NET_SHAPER_A_WEIGHT];
+	if (tb[NET_SHAPER_A_BW_MIN] &&
+	    !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_BW_MIN)))
+		bad = tb[NET_SHAPER_A_BW_MIN];
+	if (tb[NET_SHAPER_A_BW_MAX] &&
+	    !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_BW_MAX)))
+		bad = tb[NET_SHAPER_A_BW_MAX];
+	if (tb[NET_SHAPER_A_BURST] &&
+	    !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_BURST)))
+		bad = tb[NET_SHAPER_A_BURST];
+
+	if (!caps)
+		bad = tb[NET_SHAPER_A_HANDLE];
+
+	if (bad) {
+		NL_SET_BAD_ATTR(info->extack, bad);
+		return -EOPNOTSUPP;
+	}
+
+	if (shaper->handle.scope == NET_SHAPER_SCOPE_QUEUE &&
+	    binding->type == NET_SHAPER_BINDING_TYPE_NETDEV &&
+	    shaper->handle.id >= binding->netdev->real_num_tx_queues) {
+		NL_SET_ERR_MSG_FMT(info->extack,
+				   "Not existing queue id %d max %d",
+				   shaper->handle.id,
+				   binding->netdev->real_num_tx_queues);
+		return -ENOENT;
+	}
+
+	/* The metric is really used only if there is *any* rate-related
+	 * setting, either in current attributes set or in pre-existing
+	 * values.
+	 */
+	if (shaper->burst || shaper->bw_min || shaper->bw_max) {
+		u32 metric_cap = NET_SHAPER_A_CAPS_SUPPORT_METRIC_BPS +
+				 shaper->metric;
+
+		/* The metric test can fail even when the user did not
+		 * specify the METRIC attribute. Pointing to rate related
+		 * attribute will be confusing, as the attribute itself
+		 * could be indeed supported, with a different metric.
+		 * Be more specific.
+		 */
+		if (!(caps & BIT(metric_cap))) {
+			NL_SET_ERR_MSG_FMT(info->extack, "Bad metric %d",
+					   shaper->metric);
+			return -EOPNOTSUPP;
+		}
+	}
+	return 0;
+}
+
 static int net_shaper_parse_info(struct net_shaper_binding *binding,
 				 struct nlattr **tb,
 				 const struct genl_info *info,
@@ -489,6 +557,28 @@  static int net_shaper_parse_info(struct net_shaper_binding *binding,
 
 	if (tb[NET_SHAPER_A_WEIGHT])
 		shaper->weight = nla_get_u32(tb[NET_SHAPER_A_WEIGHT]);
+
+	ret = net_shaper_validate_caps(binding, tb, info, shaper);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int net_shaper_validate_nesting(struct net_shaper_binding *binding,
+				       const struct net_shaper *shaper,
+				       struct netlink_ext_ack *extack)
+{
+	const struct net_shaper_ops *ops = net_shaper_ops(binding);
+	unsigned long caps = 0;
+
+	ops->capabilities(binding, shaper->handle.scope, &caps);
+	if (!(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_NESTING))) {
+		NL_SET_ERR_MSG_FMT(extack,
+				   "Nesting not supported for scope %d",
+				   shaper->handle.scope);
+		return -EOPNOTSUPP;
+	}
 	return 0;
 }
 
@@ -519,6 +609,13 @@  static int net_shaper_parse_leaf(struct net_shaper_binding *binding,
 		return -EINVAL;
 	}
 
+	if (node->handle.scope == NET_SHAPER_SCOPE_NODE) {
+		ret = net_shaper_validate_nesting(binding, shaper,
+						  info->extack);
+		if (ret < 0)
+			return ret;
+	}
+
 	if (!exists)
 		net_shaper_default_parent(&shaper->handle, &shaper->parent);
 	return 0;
@@ -860,6 +957,10 @@  static int __net_shaper_group(struct net_shaper_binding *binding,
 					   node->parent.scope, node->parent.id);
 			return -ENOENT;
 		}
+
+		ret = net_shaper_validate_nesting(binding, node, extack);
+		if (ret < 0)
+			return ret;
 	}
 
 	if (update_node) {