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Message-Id: <20240223114453.335809-3-tobias@waldekranz.com>
Date: Fri, 23 Feb 2024 12:44:51 +0100
From: Tobias Waldekranz <tobias@...dekranz.com>
To: davem@...emloft.net,
kuba@...nel.org
Cc: roopa@...dia.com,
razor@...ckwall.org,
bridge@...ts.linux.dev,
netdev@...r.kernel.org,
jiri@...nulli.us,
ivecera@...hat.com,
rostedt@...dmis.org,
mhiramat@...nel.org,
linux-trace-kernel@...r.kernel.org
Subject: [PATCH v3 net-next 2/4] net: switchdev: Add helpers to display switchdev objects as strings
Useful both in error messages and in tracepoints.
Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
---
include/net/switchdev.h | 14 ++
net/switchdev/Makefile | 2 +-
net/switchdev/switchdev-str.c | 278 ++++++++++++++++++++++++++++++++++
3 files changed, 293 insertions(+), 1 deletion(-)
create mode 100644 net/switchdev/switchdev-str.c
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 86298a21c6c8..9bf387664e71 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -394,6 +394,20 @@ int switchdev_handle_port_attr_set(struct net_device *dev,
int (*set_cb)(struct net_device *dev, const void *ctx,
const struct switchdev_attr *attr,
struct netlink_ext_ack *extack));
+
+/* switchdev-str.c */
+ssize_t switchdev_attr_str(const struct switchdev_attr *attr,
+ char *buf, size_t len);
+ssize_t switchdev_obj_str(const struct switchdev_obj *obj,
+ char *buf, size_t len);
+ssize_t switchdev_fdb_info_str(enum switchdev_notifier_type nt,
+ const struct switchdev_notifier_fdb_info *fdbi,
+ char *buf, size_t len);
+ssize_t switchdev_brport_str(const struct switchdev_brport *brport,
+ char *buf, size_t len);
+ssize_t switchdev_notifier_str(enum switchdev_notifier_type nt,
+ const struct switchdev_notifier_info *info,
+ char *buf, size_t len);
#else
static inline int
diff --git a/net/switchdev/Makefile b/net/switchdev/Makefile
index c5561d7f3a7c..a40e4421087b 100644
--- a/net/switchdev/Makefile
+++ b/net/switchdev/Makefile
@@ -3,4 +3,4 @@
# Makefile for the Switch device API
#
-obj-y += switchdev.o
+obj-y += switchdev.o switchdev-str.o
diff --git a/net/switchdev/switchdev-str.c b/net/switchdev/switchdev-str.c
new file mode 100644
index 000000000000..a1fa7315cc28
--- /dev/null
+++ b/net/switchdev/switchdev-str.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/if_bridge.h>
+#include <net/switchdev.h>
+
+static ssize_t switchdev_str_write_id(char *buf, size_t len, unsigned long id,
+ const char *const *names, size_t n_names)
+{
+ if (id < n_names && names[id])
+ return snprintf(buf, len, "%s", names[id]);
+
+ return snprintf(buf, len, "UNKNOWN<%lu>", id);
+}
+
+ssize_t switchdev_attr_str(const struct switchdev_attr *attr,
+ char *buf, size_t len)
+{
+#define _ATTR_ID_STRINGER(_id) [SWITCHDEV_ATTR_ID_ ## _id] = #_id
+ static const char *const attr_id_strs[] = {
+ SWITCHDEV_ATTR_ID_MAPPER(_ATTR_ID_STRINGER)
+ };
+#undef _ATTR_ID_STRINGER
+
+ static const char *const stp_state_strs[] = {
+ [BR_STATE_DISABLED] = "disabled",
+ [BR_STATE_LISTENING] = "listening",
+ [BR_STATE_LEARNING] = "learning",
+ [BR_STATE_FORWARDING] = "forwarding",
+ [BR_STATE_BLOCKING] = "blocking",
+ };
+
+ char *cur = buf;
+ ssize_t n;
+
+ n = switchdev_str_write_id(cur, len, attr->id, attr_id_strs,
+ ARRAY_SIZE(attr_id_strs));
+ if (n < 0)
+ return n;
+
+ cur += n;
+ len -= n;
+
+ n = snprintf(cur, len, "(flags %#x orig %s) ", attr->flags,
+ attr->orig_dev ? netdev_name(attr->orig_dev) : "(null)");
+ if (n < 0)
+ return n;
+
+ cur += n;
+ len -= n;
+
+ switch (attr->id) {
+ case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
+ n = switchdev_str_write_id(cur, len, attr->u.stp_state,
+ stp_state_strs, ARRAY_SIZE(stp_state_strs));
+ break;
+ case SWITCHDEV_ATTR_ID_PORT_MST_STATE:
+ n = snprintf(cur, len, "msti %u", attr->u.mst_state.msti);
+ if (n < 0)
+ return n;
+
+ cur += n;
+ len -= n;
+
+ n = switchdev_str_write_id(cur, len, attr->u.mst_state.state,
+ stp_state_strs, ARRAY_SIZE(stp_state_strs));
+ break;
+ case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
+ case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
+ n = snprintf(cur, len, "val %#lx mask %#lx",
+ attr->u.brport_flags.val,
+ attr->u.brport_flags.mask);
+ break;
+ case SWITCHDEV_ATTR_ID_PORT_MROUTER:
+ case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
+ n = snprintf(cur, len, "%s",
+ attr->u.mrouter ? "enabled" : "disabled");
+ break;
+ case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
+ n = snprintf(cur, len, "%ums",
+ jiffies_to_msecs(clock_t_to_jiffies(attr->u.ageing_time)));
+ break;
+ case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
+ n = snprintf(cur, len, "%s",
+ attr->u.vlan_filtering ? "enabled" : "disabled");
+ break;
+ case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL:
+ n = snprintf(cur, len, "%#x", attr->u.vlan_protocol);
+ break;
+ case SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED:
+ n = snprintf(cur, len, "%s",
+ attr->u.mc_disabled ? "active" : "inactive");
+ break;
+ case SWITCHDEV_ATTR_ID_BRIDGE_MST:
+ n = snprintf(cur, len, "%s",
+ attr->u.mst ? "enabled" : "disabled");
+ break;
+ case SWITCHDEV_ATTR_ID_VLAN_MSTI:
+ n = snprintf(cur, len, "vid %u msti %u",
+ attr->u.vlan_msti.vid, attr->u.vlan_msti.msti);
+ break;
+ default:
+ /* Trim trailing space */
+ return --cur - buf;
+ }
+
+ if (n < 0)
+ return n;
+
+ cur += n;
+ return cur - buf;
+}
+EXPORT_SYMBOL_GPL(switchdev_attr_str);
+
+ssize_t switchdev_obj_str(const struct switchdev_obj *obj,
+ char *buf, size_t len)
+{
+#define _OBJ_ID_STRINGER(_id) [SWITCHDEV_OBJ_ID_ ## _id] = #_id
+ static const char *const obj_id_strs[] = {
+ SWITCHDEV_OBJ_ID_MAPPER(_OBJ_ID_STRINGER)
+ };
+#undef _OBJ_ID_STRINGER
+
+ const struct switchdev_obj_port_vlan *vlan;
+ const struct switchdev_obj_port_mdb *mdb;
+ char *cur = buf;
+ ssize_t n;
+
+ n = switchdev_str_write_id(cur, len, obj->id, obj_id_strs,
+ ARRAY_SIZE(obj_id_strs));
+ if (n < 0)
+ return n;
+
+ cur += n;
+ len -= n;
+
+ n = snprintf(cur, len, "(flags %#x orig %s) ", obj->flags,
+ obj->orig_dev ? netdev_name(obj->orig_dev) : "(null)");
+ if (n < 0)
+ return n;
+
+ cur += n;
+ len -= n;
+
+ switch (obj->id) {
+ case SWITCHDEV_OBJ_ID_PORT_VLAN:
+ vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
+ n = snprintf(cur, len, "vid %u flags %#x%s", vlan->vid,
+ vlan->flags, vlan->changed ? "(changed)" : "");
+ break;
+ case SWITCHDEV_OBJ_ID_PORT_MDB:
+ case SWITCHDEV_OBJ_ID_HOST_MDB:
+ mdb = SWITCHDEV_OBJ_PORT_MDB(obj);
+ n = snprintf(cur, len, "vid %u addr %pM", mdb->vid, mdb->addr);
+ break;
+ default:
+ /* Trim trailing space */
+ return --cur - buf;
+ }
+
+ if (n < 0)
+ return n;
+
+ cur += n;
+ return cur - buf;
+}
+EXPORT_SYMBOL_GPL(switchdev_obj_str);
+
+ssize_t switchdev_fdb_info_str(enum switchdev_notifier_type nt,
+ const struct switchdev_notifier_fdb_info *fdbi,
+ char *buf, size_t len)
+{
+ switch (nt) {
+ case SWITCHDEV_FDB_FLUSH_TO_BRIDGE:
+ return snprintf(buf, len, "vid %u", fdbi->vid);
+ case SWITCHDEV_FDB_ADD_TO_BRIDGE:
+ case SWITCHDEV_FDB_DEL_TO_BRIDGE:
+ case SWITCHDEV_FDB_ADD_TO_DEVICE:
+ case SWITCHDEV_FDB_DEL_TO_DEVICE:
+ case SWITCHDEV_FDB_OFFLOADED:
+ case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
+ case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
+ case SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE:
+ case SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE:
+ case SWITCHDEV_VXLAN_FDB_OFFLOADED:
+ return snprintf(buf, len, "vid %u addr %pM%s%s%s%s",
+ fdbi->vid, fdbi->addr,
+ fdbi->added_by_user ? " added_by_user" : "",
+ fdbi->is_local ? " is_local" : "",
+ fdbi->locked ? " locked" : "",
+ fdbi->offloaded ? " offloaded" : "");
+ default:
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(switchdev_fdb_info_str);
+
+ssize_t switchdev_brport_str(const struct switchdev_brport *brport,
+ char *buf, size_t len)
+{
+ return snprintf(buf, len, "dev %s%s",
+ brport->dev ? netdev_name(brport->dev) : "(null)",
+ brport->tx_fwd_offload ? " tx_fwd_offload" : "");
+}
+EXPORT_SYMBOL_GPL(switchdev_brport_str);
+
+ssize_t switchdev_notifier_str(enum switchdev_notifier_type nt,
+ const struct switchdev_notifier_info *info,
+ char *buf, size_t len)
+{
+#define _TYPE_STRINGER(_id) [SWITCHDEV_ ## _id] = #_id
+ static const char *const type_strs[] = {
+ SWITCHDEV_TYPE_MAPPER(_TYPE_STRINGER)
+ };
+#undef _TYPE_STRINGER
+
+ const struct switchdev_notifier_port_attr_info *attri;
+ const struct switchdev_notifier_brport_info *brporti;
+ const struct switchdev_notifier_port_obj_info *obji;
+ const struct switchdev_notifier_fdb_info *fdbi;
+ char *cur = buf;
+ ssize_t n;
+
+ n = switchdev_str_write_id(cur, len, nt, type_strs,
+ ARRAY_SIZE(type_strs));
+ if (n < 0)
+ return n;
+
+ cur += n;
+ len -= n;
+
+ if (len > 0) {
+ *cur++ = ' ';
+ len--;
+ }
+
+ switch (nt) {
+ case SWITCHDEV_FDB_FLUSH_TO_BRIDGE:
+ case SWITCHDEV_FDB_ADD_TO_BRIDGE:
+ case SWITCHDEV_FDB_DEL_TO_BRIDGE:
+ case SWITCHDEV_FDB_ADD_TO_DEVICE:
+ case SWITCHDEV_FDB_DEL_TO_DEVICE:
+ case SWITCHDEV_FDB_OFFLOADED:
+ case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
+ case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
+ case SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE:
+ case SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE:
+ case SWITCHDEV_VXLAN_FDB_OFFLOADED:
+ fdbi = container_of(info, typeof(*fdbi), info);
+ n = switchdev_fdb_info_str(nt, fdbi, cur, len);
+ break;
+ case SWITCHDEV_PORT_OBJ_ADD:
+ case SWITCHDEV_PORT_OBJ_DEL:
+ obji = container_of(info, typeof(*obji), info);
+ n = switchdev_obj_str(obji->obj, cur, len);
+ break;
+ case SWITCHDEV_PORT_ATTR_SET:
+ attri = container_of(info, typeof(*attri), info);
+ n = switchdev_attr_str(attri->attr, cur, len);
+ break;
+ case SWITCHDEV_BRPORT_OFFLOADED:
+ case SWITCHDEV_BRPORT_UNOFFLOADED:
+ case SWITCHDEV_BRPORT_REPLAY:
+ brporti = container_of(info, typeof(*brporti), info);
+ n = switchdev_brport_str(&brporti->brport, cur, len);
+ break;
+ default:
+ /* Trim trailing space */
+ return --cur - buf;
+ }
+
+ if (n < 0)
+ return n;
+
+ cur += n;
+ return cur - buf;
+}
+EXPORT_SYMBOL_GPL(switchdev_notifier_str);
--
2.34.1
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