From b99d0f348eada0500ea5d668d5eba283afa6c4a4 Mon Sep 17 00:00:00 2001
From: Ashish Chaudhari <ashish@ettus.com>
Date: Tue, 28 May 2019 13:21:08 -0700
Subject: rfnoc: Added link/graph specific stream managers

- Fleshed out mb_iface
- Managers currently only export ctrl APIs. Data APIs TBD
---
 host/lib/rfnoc/graph_stream_manager.cpp | 129 ++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 host/lib/rfnoc/graph_stream_manager.cpp

(limited to 'host/lib/rfnoc/graph_stream_manager.cpp')

diff --git a/host/lib/rfnoc/graph_stream_manager.cpp b/host/lib/rfnoc/graph_stream_manager.cpp
new file mode 100644
index 000000000..06f78dad4
--- /dev/null
+++ b/host/lib/rfnoc/graph_stream_manager.cpp
@@ -0,0 +1,129 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#include <uhd/exception.hpp>
+#include <uhd/utils/log.hpp>
+#include <uhdlib/rfnoc/graph_stream_manager.hpp>
+#include <uhdlib/rfnoc/link_stream_manager.hpp>
+#include <boost/format.hpp>
+#include <map>
+#include <set>
+
+using namespace uhd;
+using namespace uhd::rfnoc;
+using namespace uhd::rfnoc::chdr;
+
+graph_stream_manager::~graph_stream_manager() = default;
+
+class graph_stream_manager_impl : public graph_stream_manager
+{
+public:
+    graph_stream_manager_impl(const chdr::chdr_packet_factory& pkt_factory,
+        const epid_allocator::sptr& epid_alloc,
+        const std::vector<std::pair<device_id_t, mb_iface*>>& links)
+        : _epid_alloc(epid_alloc)
+    {
+        for (const auto& lnk : links) {
+            UHD_ASSERT_THROW(lnk.second);
+            _link_mgrs.emplace(lnk.first,
+                std::move(link_stream_manager::make(
+                    pkt_factory, *lnk.second, epid_alloc, lnk.first)));
+        }
+        for (const auto& mgr_pair : _link_mgrs) {
+            for (const auto& ep : mgr_pair.second->get_reachable_endpoints()) {
+                // Add the (potential) destinations to the
+                _reachable_endpoints.insert(ep);
+                // Add entry to source map
+                if (_src_map.count(ep) == 0) {
+                    _src_map[ep] = std::vector<device_id_t>();
+                }
+                _src_map[ep].push_back(mgr_pair.first);
+            }
+        }
+    }
+
+    virtual ~graph_stream_manager_impl() = default;
+
+    virtual const std::set<sep_addr_t>& get_reachable_endpoints() const
+    {
+        return _reachable_endpoints;
+    }
+
+    virtual std::vector<device_id_t> get_local_devices() const
+    {
+        std::vector<device_id_t> retval;
+        for (const auto& mgr_pair : _link_mgrs) {
+            retval.push_back(mgr_pair.first);
+        }
+        return retval;
+    }
+
+    virtual sep_id_pair_t init_ctrl_stream(
+        sep_addr_t dst_addr, device_id_t via_device = NULL_DEVICE_ID)
+    {
+        return _link_mgrs.at(_check_dst_and_find_src(dst_addr, via_device))
+            ->init_ctrl_stream(dst_addr);
+    }
+
+    virtual ctrlport_endpoint::sptr get_block_register_iface(sep_id_t dst_epid,
+        uint16_t block_index,
+        const clock_iface& client_clk,
+        const clock_iface& timebase_clk,
+        device_id_t via_device = NULL_DEVICE_ID)
+    {
+        sep_addr_t dst_addr = _epid_alloc->lookup_epid(dst_epid);
+        return _link_mgrs.at(_check_dst_and_find_src(dst_addr, via_device))
+            ->get_block_register_iface(dst_epid, block_index, client_clk, timebase_clk);
+    }
+
+    virtual detail::client_zero::sptr get_client_zero(
+        sep_id_t dst_epid, device_id_t via_device = NULL_DEVICE_ID) const
+    {
+        sep_addr_t dst_addr = _epid_alloc->lookup_epid(dst_epid);
+        return _link_mgrs.at(_check_dst_and_find_src(dst_addr, via_device))
+            ->get_client_zero(dst_epid);
+    }
+
+private:
+    device_id_t _check_dst_and_find_src(sep_addr_t dst_addr, device_id_t via_device) const
+    {
+        if (_src_map.count(dst_addr) > 0) {
+            const auto& src_devs = _src_map.at(dst_addr);
+            if (via_device == NULL_DEVICE_ID) {
+                // TODO: Maybe we can come up with a better heuristic for when the user
+                // gives no preference
+                return src_devs[0];
+            } else {
+                for (const auto& src : src_devs) {
+                    if (src == via_device) {
+                        return src;
+                    }
+                }
+                throw uhd::rfnoc_error("Specified destination address is unreachable "
+                                       "from the via device");
+            }
+        } else {
+            throw uhd::rfnoc_error("Specified destination address is unreachable");
+        }
+    }
+
+    // The cached EPID allocator object
+    epid_allocator::sptr _epid_alloc;
+    // A map the contains all link manager indexed by the device ID
+    std::map<device_id_t, link_stream_manager::uptr> _link_mgrs;
+    // A set of the addresses of all devices reachable from this graph
+    std::set<sep_addr_t> _reachable_endpoints;
+    // A map of addresses that can be taken to reach a particular destination
+    std::map<sep_addr_t, std::vector<device_id_t>> _src_map;
+};
+
+graph_stream_manager::uptr graph_stream_manager::make(
+    const chdr::chdr_packet_factory& pkt_factory,
+    const epid_allocator::sptr& epid_alloc,
+    const std::vector<std::pair<device_id_t, mb_iface*>>& links)
+{
+    return std::make_unique<graph_stream_manager_impl>(pkt_factory, epid_alloc, links);
+}
-- 
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