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Substituting old values to restore API breakage from DPDK 18.11 to DPDK 19.
It is recommended at this point that users upgrade to more recent DPDK LTS
versions, but the DPDK 18.11 API is functional with UHD.
Signed-off-by: mattprost <matt.prost@ni.com>
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Signed-off-by: Virendra Kakade <virendra.kakade@ni.com>
Co-authored-by: Wade Fife <wade.fife@ettus.com>
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Some APIs were changed with the latest DPDK LTS release,
add some ifdefs to fix the build.
Fixes https://github.com/EttusResearch/uhd/issues/547
Updated CMake file to reflect updated DPDK version.
Fixed mbuf size to take ethernet headers into account.
Updated documentation.
Co-authored-by: Martin Anderseck <martin.anderseck@ni.com>
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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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Swap out hyphens for underscores in the DPDK args. Also update list
of distributions with the correct DPDK version in the repos.
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The link to the MPM page in the DPDK docs was incorrectly named. This
change links to the correct page name.
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This adds some info about what is happening in the dpdk_zero_copy
transport, especially the fact that there are threads spun off that take
over CPUs.
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Co-authored-by: Alex Williams <alex.williams@ni.com>
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