netdev - [RFC PATCH net-next 06/12] Documentation: Add description of netdevsim traps

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Date:   Tue, 28 May 2019 15:21:30 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...lanox.com, mlxsw@...lanox.com,
        dsahern@...il.com, roopa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com, andy@...yhouse.net,
        pablo@...filter.org, jakub.kicinski@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, andrew@...n.ch,
        f.fainelli@...il.com, vivien.didelot@...oirfairelinux.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [RFC PATCH net-next 06/12] Documentation: Add description of netdevsim traps

From: Ido Schimmel <idosch@...lanox.com>

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 .../networking/devlink-trap-netdevsim.rst     | 20 +++++++++++++++++++
 Documentation/networking/devlink-trap.rst     | 11 ++++++++++
 Documentation/networking/index.rst            |  1 +
 drivers/net/netdevsim/dev.c                   |  3 +++
 4 files changed, 35 insertions(+)
 create mode 100644 Documentation/networking/devlink-trap-netdevsim.rst

diff --git a/Documentation/networking/devlink-trap-netdevsim.rst b/Documentation/networking/devlink-trap-netdevsim.rst
new file mode 100644
index 000000000000..06bb93caa22d
--- /dev/null
+++ b/Documentation/networking/devlink-trap-netdevsim.rst
@@ -0,0 +1,20 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+======================
+Devlink Trap netdevsim
+======================
+
+Driver-specific Traps
+=====================
+
+.. list-table:: List of Driver-specific Traps Registered by ``netdevsim``
+   :widths: 5 5 90
+
+   * - Name
+     - Type
+     - Description
+   * - ``fid_miss_exception``
+     - ``exception``
+     - When a packet enters the device it is classified to a filtering
+       indentifier (FID) based on the ingress port and VLAN. This trap is used
+       to trap packets for which a FID could not be found
diff --git a/Documentation/networking/devlink-trap.rst b/Documentation/networking/devlink-trap.rst
index 4b3045bc76d1..a015f82421b8 100644
--- a/Documentation/networking/devlink-trap.rst
+++ b/Documentation/networking/devlink-trap.rst
@@ -163,6 +163,17 @@ be added to the following table:
        Random Early Detection (RED) queueing discipline to earlydrop the
        packet
 
+Driver-specific Packet Traps
+============================
+
+Device drivers can register driver-specific packet traps, but these must be
+clearly documented. Such traps can correspond to device-specific exceptions and
+help debug packet drops caused by these exceptions. The following list includes
+links to the description of driver-specific traps registered by various device
+drivers:
+
+  * :doc:`/devlink-trap-netdevsim`
+
 Generic Packet Trap Groups
 ==========================
 
diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index c09bf85ec050..50fe7f9346ab 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -27,6 +27,7 @@ Contents:
    dsa/index
    devlink-info-versions
    devlink-trap
+   devlink-trap-netdevsim
    ieee802154
    kapi
    z8530book
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 0115a1ef1ca3..952764d1f6e6 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -216,6 +216,9 @@ struct nsim_trap_data {
 	spinlock_t trap_lock;	/* Protects trap_items_arr */
 };
 
+/* All driver-specific traps must be documented in
+ * Documentation/networking/devlink-trap-netdevsim.rst
+ */
 enum {
 	NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX,
 	NSIM_TRAP_ID_FID_MISS_EXCEPTION,
-- 
2.20.1