There are, especially with multi-attr arrays, many cases
of needing to iterate all attributes of a specific type
in a netlink message or a nested attribute. Add specific
macros to support that case.
Also convert many instances using this spatch:
@@
iterator nla_for_each_attr;
iterator name nla_for_each_attr_type;
identifier nla;
expression head, len, rem;
expression ATTR;
type T;
identifier x;
@@
-nla_for_each_attr(nla, head, len, rem)
+nla_for_each_attr_type(nla, ATTR, head, len, rem)
{
<... T x; ...>
-if (nla_type(nla) == ATTR) {
...
-}
}
@@
identifier nla;
iterator nla_for_each_nested;
iterator name nla_for_each_nested_type;
expression attr, rem;
expression ATTR;
type T;
identifier x;
@@
-nla_for_each_nested(nla, attr, rem)
+nla_for_each_nested_type(nla, ATTR, attr, rem)
{
<... T x; ...>
-if (nla_type(nla) == ATTR) {
...
-}
}
@@
iterator nla_for_each_attr;
iterator name nla_for_each_attr_type;
identifier nla;
expression head, len, rem;
expression ATTR;
type T;
identifier x;
@@
-nla_for_each_attr(nla, head, len, rem)
+nla_for_each_attr_type(nla, ATTR, head, len, rem)
{
<... T x; ...>
-if (nla_type(nla) != ATTR) continue;
...
}
@@
identifier nla;
iterator nla_for_each_nested;
iterator name nla_for_each_nested_type;
expression attr, rem;
expression ATTR;
type T;
identifier x;
@@
-nla_for_each_nested(nla, attr, rem)
+nla_for_each_nested_type(nla, ATTR, attr, rem)
{
<... T x; ...>
-if (nla_type(nla) != ATTR) continue;
...
}
Although I had to undo one bad change this made, and
I also adjusted some other code for whitespace and to
use direct variable initialization now.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20240328203144.b5a6c895fb80.I1869b44767379f204998ff44dd239803f39c23e0@changeid
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
if (!br_spec)
return -EINVAL;
- nla_for_each_nested(attr, br_spec, rem) {
+ nla_for_each_nested_type(attr, IFLA_BRIDGE_MODE, br_spec, rem) {
u16 mode;
- if (nla_type(attr) != IFLA_BRIDGE_MODE)
- continue;
-
mode = nla_get_u16(attr);
if (mode == bp->br_mode)
break;
if (!br_spec)
return -EINVAL;
- nla_for_each_nested(attr, br_spec, rem) {
- if (nla_type(attr) != IFLA_BRIDGE_MODE)
- continue;
-
+ nla_for_each_nested_type(attr, IFLA_BRIDGE_MODE, br_spec, rem) {
mode = nla_get_u16(attr);
if (BE3_chip(adapter) && mode == BRIDGE_MODE_VEPA)
return -EOPNOTSUPP;
if (!br_spec)
return -EINVAL;
- nla_for_each_nested(attr, br_spec, rem) {
- __u16 mode;
+ nla_for_each_nested_type(attr, IFLA_BRIDGE_MODE, br_spec, rem) {
+ __u16 mode = nla_get_u16(attr);
- if (nla_type(attr) != IFLA_BRIDGE_MODE)
- continue;
-
- mode = nla_get_u16(attr);
if ((mode != BRIDGE_MODE_VEPA) &&
(mode != BRIDGE_MODE_VEB))
return -EINVAL;
if (!br_spec)
return -EINVAL;
- nla_for_each_nested(attr, br_spec, rem) {
- __u16 mode;
+ nla_for_each_nested_type(attr, IFLA_BRIDGE_MODE, br_spec, rem) {
+ __u16 mode = nla_get_u16(attr);
- if (nla_type(attr) != IFLA_BRIDGE_MODE)
- continue;
- mode = nla_get_u16(attr);
if (mode != BRIDGE_MODE_VEPA && mode != BRIDGE_MODE_VEB)
return -EINVAL;
/* Continue if bridge mode is not being flipped */
if (!br_spec)
return -EINVAL;
- nla_for_each_nested(attr, br_spec, rem) {
- int status;
- __u16 mode;
+ nla_for_each_nested_type(attr, IFLA_BRIDGE_MODE, br_spec, rem) {
+ __u16 mode = nla_get_u16(attr);
+ int status = ixgbe_configure_bridge_mode(adapter, mode);
- if (nla_type(attr) != IFLA_BRIDGE_MODE)
- continue;
-
- mode = nla_get_u16(attr);
- status = ixgbe_configure_bridge_mode(adapter, mode);
if (status)
return status;
if (!br_spec)
return -EINVAL;
- nla_for_each_nested(attr, br_spec, rem) {
- if (nla_type(attr) != IFLA_BRIDGE_MODE)
- continue;
-
+ nla_for_each_nested_type(attr, IFLA_BRIDGE_MODE, br_spec, rem) {
mode = nla_get_u16(attr);
if (mode > BRIDGE_MODE_VEPA)
return -EINVAL;
if (!br_spec)
return -EINVAL;
- nla_for_each_nested(attr, br_spec, rem) {
- if (nla_type(attr) != IFLA_BRIDGE_MODE)
- continue;
-
+ nla_for_each_nested_type(attr, IFLA_BRIDGE_MODE, br_spec, rem) {
new_ctrl = nn->dp.ctrl;
mode = nla_get_u16(attr);
if (mode == BRIDGE_MODE_VEPA)
* nla_parse() parse and validate stream of attrs
* nla_parse_nested() parse nested attributes
* nla_for_each_attr() loop over all attributes
+ * nla_for_each_attr_type() loop over all attributes with the
+ * given type
* nla_for_each_nested() loop over the nested attributes
+ * nla_for_each_nested_type() loop over the nested attributes with
+ * the given type
*=========================================================================
*/
nla_ok(pos, rem); \
pos = nla_next(pos, &(rem)))
+/**
+ * nla_for_each_attr_type - iterate over a stream of attributes
+ * @pos: loop counter, set to current attribute
+ * @type: required attribute type for @pos
+ * @head: head of attribute stream
+ * @len: length of attribute stream
+ * @rem: initialized to len, holds bytes currently remaining in stream
+ */
+#define nla_for_each_attr_type(pos, type, head, len, rem) \
+ nla_for_each_attr(pos, head, len, rem) \
+ if (nla_type(pos) == type)
+
/**
* nla_for_each_nested - iterate over nested attributes
* @pos: loop counter, set to current attribute
#define nla_for_each_nested(pos, nla, rem) \
nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
+/**
+ * nla_for_each_nested_type - iterate over nested attributes
+ * @pos: loop counter, set to current attribute
+ * @type: required attribute type for @pos
+ * @nla: attribute containing the nested attributes
+ * @rem: initialized to len, holds bytes currently remaining in stream
+ */
+#define nla_for_each_nested_type(pos, type, nla, rem) \
+ nla_for_each_nested(pos, nla, rem) \
+ if (nla_type(pos) == type)
+
/**
* nla_is_last - Test if attribute is last in stream
* @nla: attribute to test
return err;
}
if (data[IFLA_VLAN_INGRESS_QOS]) {
- nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
- if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
- continue;
+ nla_for_each_nested_type(attr, IFLA_VLAN_QOS_MAPPING,
+ data[IFLA_VLAN_INGRESS_QOS], rem) {
m = nla_data(attr);
vlan_dev_set_ingress_priority(dev, m->to, m->from);
}
}
if (data[IFLA_VLAN_EGRESS_QOS]) {
- nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
- if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
- continue;
+ nla_for_each_nested_type(attr, IFLA_VLAN_QOS_MAPPING,
+ data[IFLA_VLAN_EGRESS_QOS], rem) {
m = nla_data(attr);
err = vlan_dev_set_egress_priority(dev, m->from, m->to);
if (err)
if (!bpf_capable())
return ERR_PTR(-EPERM);
- nla_for_each_nested(nla, nla_stgs, rem) {
- if (nla_type(nla) == SK_DIAG_BPF_STORAGE_REQ_MAP_FD) {
- if (nla_len(nla) != sizeof(u32))
- return ERR_PTR(-EINVAL);
- nr_maps++;
- }
+ nla_for_each_nested_type(nla, SK_DIAG_BPF_STORAGE_REQ_MAP_FD,
+ nla_stgs, rem) {
+ if (nla_len(nla) != sizeof(u32))
+ return ERR_PTR(-EINVAL);
+ nr_maps++;
}
diag = kzalloc(struct_size(diag, maps, nr_maps), GFP_KERNEL);
if (!diag)
return ERR_PTR(-ENOMEM);
- nla_for_each_nested(nla, nla_stgs, rem) {
- struct bpf_map *map;
- int map_fd;
-
- if (nla_type(nla) != SK_DIAG_BPF_STORAGE_REQ_MAP_FD)
- continue;
+ nla_for_each_nested_type(nla, SK_DIAG_BPF_STORAGE_REQ_MAP_FD,
+ nla_stgs, rem) {
+ int map_fd = nla_get_u32(nla);
+ struct bpf_map *map = bpf_map_get(map_fd);
- map_fd = nla_get_u32(nla);
- map = bpf_map_get(map_fd);
if (IS_ERR(map)) {
err = PTR_ERR(map);
goto err_free;
br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
if (br_spec) {
- nla_for_each_nested(attr, br_spec, rem) {
- if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
- if (nla_len(attr) < sizeof(flags))
- return -EINVAL;
+ nla_for_each_nested_type(attr, IFLA_BRIDGE_FLAGS, br_spec,
+ rem) {
+ if (nla_len(attr) < sizeof(flags))
+ return -EINVAL;
- have_flags = true;
- flags = nla_get_u16(attr);
- break;
- }
+ have_flags = true;
+ flags = nla_get_u16(attr);
+ break;
}
}
if (err)
goto free_msg;
- nla_for_each_attr(nlattr, (void *)msg->data, msg->len, rem) {
+ nla_for_each_attr_type(nlattr, DEVLINK_ATTR_INFO_VERSION_RUNNING,
+ (void *)msg->data, msg->len, rem) {
const struct nlattr *kv;
int rem_kv;
- if (nla_type(nlattr) != DEVLINK_ATTR_INFO_VERSION_RUNNING)
- continue;
-
- nla_for_each_nested(kv, nlattr, rem_kv) {
- if (nla_type(kv) != DEVLINK_ATTR_INFO_VERSION_VALUE)
- continue;
-
+ nla_for_each_nested_type(kv, DEVLINK_ATTR_INFO_VERSION_VALUE,
+ nlattr, rem_kv) {
strlcat(buf, nla_data(kv), len);
strlcat(buf, " ", len);
}
for (tc = 0; tc < TC_QOPT_MAX_QUEUE; tc++)
fp[tc] = priv->fp[tc];
- nla_for_each_attr(n, nlattr_opt, nlattr_opt_len, rem) {
- if (nla_type(n) != TCA_MQPRIO_TC_ENTRY)
- continue;
-
+ nla_for_each_attr_type(n, TCA_MQPRIO_TC_ENTRY, nlattr_opt,
+ nlattr_opt_len, rem) {
err = mqprio_parse_tc_entry(fp, n, &seen_tcs, extack);
if (err)
goto out;
fp[tc] = q->fp[tc];
}
- nla_for_each_nested(n, opt, rem) {
- if (nla_type(n) != TCA_TAPRIO_ATTR_TC_ENTRY)
- continue;
-
+ nla_for_each_nested_type(n, TCA_TAPRIO_ATTR_TC_ENTRY, opt, rem) {
err = taprio_parse_tc_entry(sch, n, max_sdu, fp, &seen_tcs,
extack);
if (err)