mpmd,transport,prefs: Add xport_mgr for dpdk_zero_copy

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.

1 files changed, 80 insertions, 0 deletions

diff --git a/host/lib/include/uhdlib/transport/dpdk_common.hpp b/host/lib/include/uhdlib/transport/dpdk_common.hpp
new file mode 100644
index 000000000..2f320e79e
--- /dev/null
+++ b/host/lib/include/uhdlib/transport/dpdk_common.hpp
@@ -0,0 +1,80 @@
+//
+// Copyright 2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#ifndef INCLUDED_DPDK_COMMON_HPP
+#define INCLUDED_DPDK_COMMON_HPP
+
+#include <uhd/config.hpp>
+#include <uhd/types/device_addr.hpp>
+#include <uhd/utils/static.hpp>
+#include <array>
+#include <atomic>
+#include <mutex>
+#include <string>
+
+namespace uhd { namespace transport {
+
+class uhd_dpdk_ctx : boost::noncopyable {
+public:
+    UHD_SINGLETON_FCN(uhd_dpdk_ctx, get);
+
+    ~uhd_dpdk_ctx(void);
+
+    /*!
+     * Initialize uhd-dpdk (and do only once)
+     * \param user_args User args passed in to override config files
+     */
+    void init(const device_addr_t &user_args);
+
+    /*!
+     * Get MTU of NICs used by DPDK
+     *
+     * \return Number of Bytes in MTU
+     */
+    size_t get_mtu(void) const;
+
+    /*!
+     * Get port ID from provided MAC address
+     * \param mac_addr MAC address
+     * \param port_id Int to write ID of port corresponding to MAC address
+     * \return 0 if match found, else no match
+     */
+    int get_port_id(std::array<uint8_t, 6> mac_addr, unsigned int &port_id) const;
+
+    /*!
+     * Get port ID for routing packet destined for given address
+     * \param addr Destination address
+     * \return port ID from routing table
+     */
+    int get_route(const std::string &addr) const;
+
+    /*!
+     * Set IPv4 address and subnet mask of given NIC port
+     * Not thread-safe. Should only be written before ports are in use.
+     * \param port_id NIC port ID
+     * \param ipv4_addr IPv4 address to write
+     * \param netmask Subnet mask identifying network number in ipv4_addr
+     * \return 0 if successful, else error
+     */
+    int set_ipv4_addr(unsigned int port_id, uint32_t ipv4_addr, uint32_t netmask);
+
+    /*!
+     * \return whether init() has been called
+     */
+    bool is_init_done(void) const;
+
+private:
+    uhd_dpdk_ctx(void);
+
+    size_t _mtu;
+    std::mutex _init_mutex;
+    std::atomic<bool> _init_done;
+    uhd::dict<uint32_t, unsigned int> _routes;
+};
+
+}} // namespace uhd::transport
+
+#endif /* INCLUDED_DPDK_COMMON_HPP */