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This change improves the DPDK link status detection algorithm in the
following ways:
- The status of the links are checked at an interval of 250 ms. If all
links report as being up, the driver proceeds.
- If any of the DPDK links has not reported as being up by the end of
the link status detection timeout (1000 ms by default), the algorithm
throws a runtime error rather than proceeds with one or more down
links.
- Users may override the default link status detection timeout by
passing dpdk_link_timeout=N, where N is the desired timeout in
milliseconds, either via device arguments or in the UHD configuration
file.
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Clear the io service map and the dpdk port map in the dpdk context
destructor to force them to destruct before the dpdk context.
Signed-off-by: ettus <matt.prost@ni.com>
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Debian uses pkg-config without the libdpdk.so linker script. Use
the pkg-config file to grab the installed libraries and determine
what to link to.
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These were left here as a reference.
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docs: Update DPDK docs with new parameters:
Parameter names have had their hyphens changed to underscores, and
the I/O CPU argument is now named after the lcores and reflects
the naming used by DPDK.
transport: Add new udp_dpdk_link, based atop the new APIs:
This link is tightly coupled with the DPDK I/O service. The link class
carries all the address information to communicate with the other
host, and it can send packets directly through the DPDK NIC ports.
However, for receiving packets, the I/O service must pull the packets
from the DMA queue and attach them to the appropriate link object.
The link object merely formats the frame_buff object underneath, which
is embedded in the rte_mbuf container. For get_recv_buff, the link
will pull buffers only from its internal queue (the one filled by the
I/O service).
transport: Add DPDK-specific I/O service:
The I/O service is split into two parts, the user threads and the
I/O worker threads. The user threads submit requests through
various appropriate queues, and the I/O threads perform all the
I/O on their behalf. This includes routing UDP packets to the
correct receiver and getting the MAC address of a destination (by
performing the ARP request and handling the ARP replies).
The DPDK context stores I/O services. The context spawns all I/O
services on init(), and I/O services can be fetched from the dpdk_ctx
object by using a port ID.
I/O service clients:
The clients have two lockless ring buffers. One is to get a buffer
from the I/O service; the other is to release a buffer back to the
I/O service. Threads sleeping on buffer I/O are kept in a separate
list from the service queue and are processed in the course of doing
RX or TX.
The list nodes are embedded in the dpdk_io_if, and the head of the
list is on the dpdk_io_service. The I/O service will transfer the
embedded wait_req to the list if it cannot acquire the mutex to
complete the condition for waking.
Co-authored-by: Martin Braun <martin.braun@ettus.com>
Co-authored-by: Ciro Nishiguchi <ciro.nishiguchi@ni.com>
Co-authored-by: Brent Stapleton <brent.stapleton@ettus.com>
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The DPDK files are left behind as a reference, for now.
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dpdk_ctx represents the central context and manager of all memory
and threads allocated via the DPDK EAL. In this commit, it parses
the user's arguments, configures all the ports, and brings them up.
dpdk_port represents each DPDK NIC port's configuration, and it
manages the allocation of individual queues and their flow rules.
It also would provide access to an ARP table and functions for
handling ARP requests and responses. The flow rules and ARP
functions are not yet implemented.
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Occasionally, MPM would check its links before the kernel would report
link up, and it would then shave those ports off the CHDR link list
prematurely. This commit adds a second of wait to allow the kernel time
to respond.
It also includes some additional reporting of link status, since Intel
PMDs may report a misleading initial state upon bring-up.
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Updating all SPDX license identifiers to include "-or-later"
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Some NICs were not enabling TX IP checksum offloads. This fixes that
issue.
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This was old code that wouldn't compile or run anymore.
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Add configuration sections to the UHD config file for NIC entries. Keys
are based on MAC addresses, and the entries beneath the section describe
which CPU and I/O thread to use for the NIC and its IPv4 address.
Make ring sizes configurable for uhd-dpdk. Ring size is now an argument
for packet buffers. Note that the maximum number of available buffers
is still determined at init!
Add ability to receive broadcasts to uhd-dpdk. This is controllable by
a boolean in the sockarg during socket creation. dpdk_zero_copy will
filter broadcast packets out.
Add dpdk_simple transport (to mirror udp_simple). This transport allows
receiving from broadcast addresses, but it only permits one outstanding
buffer at a time.
Fix IP checksum handling in UHD-DPDK.
TX checksums were not being calculated in the NIC, and in RX, the check
for IP checksums allowed values of zero (reported as none). Now packets
with bad IP checksums will be dropped.
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This adds an internal wait queue API to uhd-dpdk. Socket configuration
requests had their blocking calls re-implemented on top of this API, and
it is also used to service requests to wait on RX packets (w/ timeout).
The wait API involves a multi-producer, single-consumer queue per I/O
thread (waiter_ring), with a condition variable used for sleeping. The
data structure is shared between user thread and I/O thread, and because
timeouts make resource release time non-deterministic, we use reference
counting on the shared resource.
One reference is generated by the user thread and passed to the I/O
thread to consume. A user thread that still needs the data after waking
must get() another reference, to postpone the destruction of the
resource until it is done.
Timeouts are based on CLOCK_MONOTONIC. For recv, a timeout of 0
indicates blocking indefinitely, and a negative timeout indicates no
timeout is desired.
Also drop timeout for closing sockets in uhd-dpdk.
The timeout would allow a user thread to pre-empt the I/O thread's
cleanup process. The user thread would free data structures the I/O
thread still needed to function. Since this timeout is superfluous
anyway, let's just get rid of it.
Also add some more input checking and error reporting.
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Set MTU of Ethernet ports:
Some NICs (like the Mellanox ones) require this to work.
Add ARP responder to uhd-dpdk.
Clean up pending ARP request list when done:
Threads waiting for an ARP request to complete would be woken up when
the request completed, but they wouldn't get removed from the list of
pending requests. This fixes the issue.
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This library makes available a userspace network stack with a
socket-like interface for applications (except the sockets pass around
pointers to buffers and use the buffers directly--It's sockets + a
put/get for buffer management). Supported services are ARP and UDP.
Destinations can be unicast or broadcast. Multicast is not currently
supported.
The implementation has two driver layers. The upper layer runs within
the caller's context. The caller will make requests through lockless
ring buffers (including socket creation and packet transmission), and
the lower layer will implement the requests and provide a response.
Currently, the lower layer runs in a separate I/O thread, and the caller
will block until it receives a response.
The I/O thread's main body is in src/uhd_dpdk_driver.c. You'll find that
all I/O thread functions are prefixed by an underscore, and user thread
functions do not.
src/uhd_dpdk.c is used to initialize uhd-dpdk and bring up the network
interfaces.
src/uhd_dpdk_fops.c and src/uhd_dpdk_udp.c are for network services.
The test is a benchmark of a flow control loop using a certain made-up
protocol with credits and sequence number tracking.
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