From: Maryam Tahhan <mtahhan@xxxxxxxxxx>
Add documentation for BPF_MAP_TYPE_DEVMAP and
BPF_MAP_TYPE_DEVMAP_HASH including kernel version
introduced, usage and examples.
Add documentation that describes XDP_REDIRECT.
Signed-off-by: Maryam Tahhan <mtahhan@xxxxxxxxxx>
---
Documentation/bpf/index.rst | 1 +
Documentation/bpf/map_devmap.rst | 221 +++++++++++++++++++++++++++++++
Documentation/bpf/redirect.rst | 81 +++++++++++
net/core/filter.c | 8 +-
4 files changed, 309 insertions(+), 2 deletions(-)
create mode 100644 Documentation/bpf/map_devmap.rst
create mode 100644 Documentation/bpf/redirect.rst
diff --git a/Documentation/bpf/index.rst b/Documentation/bpf/index.rst
index 1b50de1983ee..1088d44634d6 100644
--- a/Documentation/bpf/index.rst
+++ b/Documentation/bpf/index.rst
@@ -29,6 +29,7 @@ that goes into great technical depth about the BPF Architecture.
clang-notes
linux-notes
other
+ redirect
.. only:: subproject and html
diff --git a/Documentation/bpf/map_devmap.rst b/Documentation/bpf/map_devmap.rst
new file mode 100644
index 000000000000..77a7a10ee1b6
--- /dev/null
+++ b/Documentation/bpf/map_devmap.rst
@@ -0,0 +1,221 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+.. Copyright (C) 2022 Red Hat, Inc.
+
+=================================================
+BPF_MAP_TYPE_DEVMAP and BPF_MAP_TYPE_DEVMAP_HASH
+=================================================
+
+.. note::
+ - ``BPF_MAP_TYPE_DEVMAP`` was introduced in kernel version 4.14
+ - ``BPF_MAP_TYPE_DEVMAP_HASH`` was introduced in kernel version 5.4
+
+``BPF_MAP_TYPE_DEVMAP`` and ``BPF_MAP_TYPE_DEVMAP_HASH`` are BPF maps primarily
+used as backend maps for the XDP BPF helper call ``bpf_redirect_map()``.
+``BPF_MAP_TYPE_DEVMAP`` is backed by an array that uses the key as
+the index to lookup a reference to a net device. While ``BPF_MAP_TYPE_DEVMAP_HASH``
+is backed by a hash table that uses a key to lookup a reference to a net device.
+The user provides either <``key``/ ``ifindex``> or <``key``/ ``struct bpf_devmap_val``>
+pairs to update the maps with new net devices.
+
+.. note::
+ - The key to a hash map doesn't have to be an ``ifindex``.
+ - While ``BPF_MAP_TYPE_DEVMAP_HASH`` allows for densely packing the net devices
+ it comes at the cost of a hash of the key when performing a look up.
+
+The setup and packet enqueue/send code is shared between the two types of
+devmap; only the lookup and insertion is different.
+
+Usage
+=====
+Kernel BPF
+----------
+.. c:function::
+ long bpf_redirect_map(struct bpf_map *map, u32 key, u64 flags)
+
+Redirect the packet to the endpoint referenced by ``map`` at index ``key``.
+For ``BPF_MAP_TYPE_DEVMAP`` and ``BPF_MAP_TYPE_DEVMAP_HASH`` this map contains
+references to net devices (for forwarding packets through other ports).
+
+The lower two bits of *flags* are used as the return code if the map lookup
+fails. This is so that the return value can be one of the XDP program return
+codes up to ``XDP_TX``, as chosen by the caller. The higher bits of ``flags``
+can be set to ``BPF_F_BROADCAST`` or ``BPF_F_EXCLUDE_INGRESS`` as defined
+below.
+
+With ``BPF_F_BROADCAST`` the packet will be broadcast to all the interfaces
+in the map, with ``BPF_F_EXCLUDE_INGRESS`` the ingress interface will be excluded
+from the broadcast.
+
+.. note::
+ - The key is ignored if BPF_F_BROADCAST is set.
+ - Multicast can also be achieved using multiple DEVMAPs.
+
+This helper will return ``XDP_REDIRECT`` on success, or the value of the two
+lower bits of the ``flags`` argument if the map lookup fails.
+
+More information about redirection can be found :doc:`redirect`
+
+.. c:function::
+ void *bpf_map_lookup_elem(struct bpf_map *map, const void *key)
+
+Net device entries can be retrieved using the ``bpf_map_lookup_elem()``
+helper.
+
+Userspace
+---------
+.. note::
+ DEVMAP entries can only be updated/deleted from user space and not
+ from an eBPF program. Trying to call these functions from a kernel eBPF
+ program will result in the program failing to load and a verifier warning.
+
+.. c:function::
+ int bpf_map_update_elem(int fd, const void *key, const void *value, __u64 flags);
+
+ Net device entries can be added or updated using the ``bpf_map_update_elem()``
+ helper. This helper replaces existing elements atomically. The ``value`` parameter
+ can be ``struct bpf_devmap_val`` or a simple ``int ifindex`` for backwards
+ compatibility.
+
+ .. code-block:: c
+
+ struct bpf_devmap_val {
+ __u32 ifindex; /* device index */
+ union {
+ int fd; /* prog fd on map write */
+ __u32 id; /* prog id on map read */
+ } bpf_prog;
+ };
+
+ The ``flags`` argument can be one of the following:
+
+ - ``BPF_ANY``: Create a new element or update an existing element.
+ - ``BPF_NOEXIST``: Create a new element only if it did not exist.
+ - ``BPF_EXIST``: Update an existing element.
+
+ DEVMAPs can associate a program with a device entry by adding a ``bpf_prog.fd``
+ to ``struct bpf_devmap_val``. Programs are run after ``XDP_REDIRECT`` and have
+ access to both Rx device and Tx device. The program associated with the ``fd``
+ must have type XDP with expected attach type ``xdp_devmap``.
+ When a program is associated with a device index, the program is run on an
+ ``XDP_REDIRECT`` and before the buffer is added to the per-cpu queue. Examples
+ of how to attach/use xdp_devmap progs can be found in the kernel selftests:
+
+ - ``tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c``
+ - ``tools/testing/selftests/bpf/progs/test_xdp_with_devmap_helpers.c``
+
+.. c:function::
+ int bpf_map_lookup_elem(int fd, const void *key, void *value);
+
+ Net device entries can be retrieved using the ``bpf_map_lookup_elem()``
+ helper.
+
+.. c:function::
+ int bpf_map_delete_elem(int fd, const void *key);
+
+ Net device entries can be deleted using the ``bpf_map_delete_elem()``
+ helper. This helper will return 0 on success, or negative error in case of
+ failure.
+
+Examples
+========
+
+Kernel BPF
+----------
+
+The following code snippet shows how to declare a ``BPF_MAP_TYPE_DEVMAP``
+called tx_port.
+
+.. code-block:: c
+
+ struct {
+ __uint(type, BPF_MAP_TYPE_DEVMAP);
+ __type(key, __u32);
+ __type(value, __u32);
+ __uint(max_entries, 256);
+ } tx_port SEC(".maps");
+
+The following code snippet shows how to declare a ``BPF_MAP_TYPE_DEVMAP_HASH``
+called forward_map.
+
+.. code-block:: c
+
+ struct {
+ __uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
+ __type(key, __u32);
+ __type(value, struct bpf_devmap_val);
+ __uint(max_entries, 32);
+ } forward_map SEC(".maps");
+
+.. note::
+
+ The value type in the DEVMAP above is a ``struct bpf_devmap_val``
+
+The following code snippet shows a simple xdp_redirect_map program. This program
+would work with a user space program that populates the devmap ``forward_map`` based
+on ingress ifindexes. The BPF program (below) is redirecting packets using the
+ingress ``ifindex`` as the ``key``.
+
+.. code-block:: c
+
+ SEC("xdp")
+ int xdp_redirect_map_func(struct xdp_md *ctx)
+ {
+ int index = ctx->ingress_ifindex;
+
+ return bpf_redirect_map(&forward_map, index, 0);
+ }
+
+The following code snippet shows a BPF program that is broadcasting packets to
+all the interfaces in the ``tx_port`` devmap.
+
+.. code-block:: c
+
+ SEC("xdp")
+ int xdp_redirect_map_func(struct xdp_md *ctx)
+ {
+ return bpf_redirect_map(&tx_port, 0, BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS);
+ }
+
+User space
+----------
+
+The following code snippet shows how to update a devmap called ``tx_port``.
+
+.. code-block:: c
+
+ int update_devmap(int ifindex, int redirect_ifindex)
+ {
+ int ret = -1;
+
+ ret = bpf_map_update_elem(bpf_map__fd(tx_port), &ifindex, &redirect_ifindex, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Failed to update devmap_ value: %s\n",
+ strerror(errno));
+ }
+
+ return ret;
+ }
+
+The following code snippet shows how to update a hash_devmap called ``forward_map``.
+
+.. code-block:: c
+
+ int update_devmap(int ifindex, int redirect_ifindex)
+ {
+ struct bpf_devmap_val devmap_val = { .ifindex = redirect_ifindex };
+ int ret = -1;
+
+ ret = bpf_map_update_elem(bpf_map__fd(forward_map), &ifindex, &devmap_val, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Failed to update devmap_ value: %s\n",
+ strerror(errno));
+ }
+ return ret;
+ }
+
+References
+===========
+
+- https://lwn.net/Articles/728146/
+- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=6f9d451ab1a33728adb72d7ff66a7b374d665176
+- https://elixir.bootlin.com/linux/latest/source/net/core/filter.c#L4106
diff --git a/Documentation/bpf/redirect.rst b/Documentation/bpf/redirect.rst
new file mode 100644
index 000000000000..9440a913c185
--- /dev/null
+++ b/Documentation/bpf/redirect.rst
@@ -0,0 +1,81 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+.. Copyright (C) 2022 Red Hat, Inc.
+
+========
+Redirect
+========
+XDP_REDIRECT
+############
+Supported maps
+--------------
+
+XDP_REDIRECT works with the following map types:
+
+- ``BPF_MAP_TYPE_DEVMAP``
+- ``BPF_MAP_TYPE_DEVMAP_HASH``
+- ``BPF_MAP_TYPE_CPUMAP``
+- ``BPF_MAP_TYPE_XSKMAP``
+
+For more information on these maps, please see the specific map documentation.
+
+Process
+-------
+
+.. kernel-doc:: net/core/filter.c
+ :doc: xdp redirect
+
+.. note::
+ Not all drivers support transmitting frames after a redirect, and for
+ those that do, not all of them support non-linear frames. Non-linear xdp
+ bufs/frames are bufs/frames that contain more than one fragment.
+
+Debugging packet drops
+----------------------
+Silent packet drops for ``XDP_REDIRECT`` can be debugged using:
+
+- bpf_trace
+- perf_record
+
+bpf_trace
+^^^^^^^^^
+The following bpftrace command can be used to capture and count all XDP tracepoints:
+
+.. code-block:: none
+
+ sudo bpftrace -e 'tracepoint:xdp:* { @cnt[probe] = count(); }'
+ Attaching 12 probes...
+ ^C
+
+ @cnt[tracepoint:xdp:mem_connect]: 18
+ @cnt[tracepoint:xdp:mem_disconnect]: 18
+ @cnt[tracepoint:xdp:xdp_exception]: 19605
+ @cnt[tracepoint:xdp:xdp_devmap_xmit]: 1393604
+ @cnt[tracepoint:xdp:xdp_redirect]: 22292200
+
+.. note::
+ The various xdp tracepoints can be found in ``source/include/trace/events/xdp.h``
+
+The following bpftrace command can be used to extract the ``ERRNO`` being returned as
+part of the err parameter:
+
+.. code-block:: none
+
+ sudo bpftrace -e \
+ 'tracepoint:xdp:xdp_redirect*_err {@redir_errno[-args->err] = count();}
+ tracepoint:xdp:xdp_devmap_xmit {@devmap_errno[-args->err] = count();}'
+
+perf record
+^^^^^^^^^^^
+The perf tool also supports recording tracepoints:
+
+.. code-block:: none
+
+ perf record -a -e xdp:xdp_redirect_err \
+ -e xdp:xdp_redirect_map_err \
+ -e xdp:xdp_exception \
+ -e xdp:xdp_devmap_xmit
+
+References
+===========
+
+- https://github.com/xdp-project/xdp-tutorial/tree/master/tracing02-xdp-monitor
diff --git a/net/core/filter.c b/net/core/filter.c
index bb0136e7a8e4..d582cb025f4c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4104,7 +4104,10 @@ static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
.arg2_type = ARG_ANYTHING,
};
-/* XDP_REDIRECT works by a three-step process, implemented in the functions
+/**
+ * DOC: xdp redirect
+ *
+ * XDP_REDIRECT works by a three-step process, implemented in the functions
* below:
*
* 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target
@@ -4119,7 +4122,8 @@ static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
* 3. Before exiting its NAPI poll loop, the driver will call xdp_do_flush(),
* which will flush all the different bulk queues, thus completing the
* redirect.
- *
+ */
+/*
* Pointers to the map entries will be kept around for this whole sequence of
* steps, protected by RCU. However, there is no top-level rcu_read_lock() in
* the core code; instead, the RCU protection relies on everything happening
--
2.35.3
