dpdk: Improve link status detection

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.

1 files changed, 1 insertions, 0 deletions

diff --git a/host/lib/include/uhdlib/transport/dpdk/common.hpp b/host/lib/include/uhdlib/transport/dpdk/common.hpp
index 280b7da64..c153c7107 100644
--- a/host/lib/include/uhdlib/transport/dpdk/common.hpp
+++ b/host/lib/include/uhdlib/transport/dpdk/common.hpp
@@ -387,6 +387,7 @@ private:
     size_t _mtu;
     int _num_mbufs;
     int _mbuf_cache_size;
+    int _link_init_timeout;
     std::mutex _init_mutex;
     std::atomic<bool> _init_done;
     uhd::dict<uint32_t, port_id_t> _routes;