Replace some hard-coded section numbers by dynamic links.
Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
For each physical port, kni also creates a kernel thread that retrieves packets from the kni receive queue,
place them onto kni's raw socket's queue and wake up the vhost kernel thread to exchange packets with the virtio virt queue.
- For more details about kni, please refer to Chapter 24 "Kernel NIC Interface".
+ For more details about kni, please refer to :ref:`kni`.
#. Enable the kni raw socket functionality for the specified physical NIC port,
get the generated file descriptor and set it in the qemu command line parameter.
The caller has an ability to explicitly specify which mempools should be used to allocate 'direct' and 'indirect' mbufs from.
-For more information about direct and indirect mbufs, refer to the *DPDK Programmers guide 7.7 Direct and Indirect Buffers.*
+For more information about direct and indirect mbufs, refer to :ref:`direct_indirect_buffer`.
Packet reassembly
-----------------
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.. _kni:
+
Kernel NIC Interface
====================
Implementation Details
~~~~~~~~~~~~~~~~~~~~~~
-This is a modification of the algorithm used for IPv4 (see Section 19.2 "Implementation Details").
+This is a modification of the algorithm used for IPv4 (see :ref:`lpm4_details`).
In this case, instead of using two levels, one with a tbl24 and a second with a tbl8, 14 levels are used.
The implementation can be seen as a multi-bit trie where the *stride*
the algorithm picks the rule with the highest depth as the best match rule,
which means that the rule has the highest number of most significant bits matching between the input key and the rule key.
+.. _lpm4_details:
+
Implementation Details
----------------------
documentation (rte_mbuf.h). Also refer to the testpmd source code
(specifically the csumonly.c file) for details.
+.. _direct_indirect_buffer:
+
Direct and Indirect Buffers
---------------------------
When creating a new pool, the user can specify to use this feature or not.
+.. _mempool_local_cache:
+
Local Cache
-----------
.. note::
- Refer to Section 23.3 "Multi-process Limitations" for details of
+ Refer to `Multi-process Limitations`_ for details of
how Linux kernel Address-Space Layout Randomization (ASLR) can affect memory sharing.
.. _figure_multi_process_memory:
The hierarchical scheduler is optimized for a large number of packet queues.
When only a small number of queues are needed, message passing queues should be used instead of this block.
-See Section 26.2.5 "Worst Case Scenarios for Performance" for a more detailed discussion.
+See `Worst Case Scenarios for Performance`_ for a more detailed discussion.
Scheduling Hierarchy
~~~~~~~~~~~~~~~~~~~~
| | | of the grinders), update the credits for the pipe and its subport. |
| | | |
| | | The current implementation is using option 3. According to Section |
- | | | 26.2.4.4 "Dequeue State Machine", the pipe and subport credits are |
+ | | | `Dequeue State Machine`_, the pipe and subport credits are |
| | | updated every time a pipe is selected by the dequeue process before the |
| | | pipe and subport credits are actually used. |
| | | |
| 1 | tc_time | Bytes | Time of the next update (upper limit refill) for the 4 TCs of the |
| | | | current subport / pipe. |
| | | | |
- | | | | See Section 26.2.4.5.1, "Internal Time Reference" for the |
+ | | | | See Section `Internal Time Reference`_ for the |
| | | | explanation of why the time is maintained in byte units. |
| | | | |
+---+-----------------------+-------+-----------------------------------------------------------------------+
The time reference is in units of bytes,
where a byte signifies the time duration required by the physical interface to send out a byte on the transmission medium
-(see Section 26.2.4.5.1 "Internal Time Reference").
+(see Section `Internal Time Reference`_).
The parameter s is defined in the dropper module as a constant with the value: s=2^22.
This corresponds to the time required by every leaf node in a hierarchy with 64K leaf nodes
to transmit one 64-byte packet onto the wire and represents the worst case scenario.
The ring supports bulk and burst access,
meaning that it is possible to read several elements from the ring with only one costly atomic operation
-(see Chapter 5 "Ring Library").
+(see :doc:`ring_lib`).
Performance is greatly improved when using bulk access operations.
The code algorithm that dequeues messages may be something similar to the following:
~~~~~~~~~~~~~~~~~~~~~~
The L2 Forwarding sample application takes specific parameters,
-in addition to Environment Abstraction Layer (EAL) arguments (see Section 9.3).
+in addition to Environment Abstraction Layer (EAL) arguments
+(see `Running the Application`_).
The preferred way to parse parameters is to use the getopt() function,
since it is part of a well-defined and portable library.
Values of struct lcore_queue_conf:
* n_rx_port and rx_port_list[] are used in the main packet processing loop
- (see Section 9.4.6 "Receive, Process and Transmit Packets" later in this chapter).
+ (see Section `Receive, Process and Transmit Packets`_ later in this chapter).
* rx_timers and flush_timer are used to ensure forced TX on low packet rate.
rte_lcore_id() function will not work in the correct way.
However, sometimes these threads/processes still need the unique ID mechanism to do easy access on structures or resources.
For example, the DPDK mempool library provides a local cache mechanism
-(refer to *DPDK Programmer's Guide* , Section 6.4, "Local Cache")
+(refer to :ref:`mempool_local_cache`)
for fast element allocation and freeing.
If using a non-unique ID or a fake one,
a race condition occurs if two or more threads/ processes with the same core ID try to use the local cache.
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