af_xdp tryout

flow-graphs/2110-20.json

@@ -5,6 +5,8 @@
       "type": "2110",
       "params": {
         "interface": "eno1np0",
+        "backend": "af_xdp",
+        "af_xdp_zero_copy": false,
         "local_ip": "192.168.0.3",
         "sdp": "v=0\no=- 3150588975 5 IN IP4 192.168.0.2\ns=DeckLink IP/SDI HD (1): Video\nt=0 0\nm=video 16388 RTP/AVP 96\nc=IN IP4 239.255.197.181/255\na=source-filter:incl IN IP4 239.255.197.181 192.168.0.2\na=rtpmap:96 raw/90000\na=fmtp:96 sampling=YCbCr-4:2:2; depth=10; width=1920; height=1080; exactframerate=50; colorimetry=BT709; PM=2110GPM; SSN=ST2110-20:2017; TP=2110TPN;\na=ts-refclk:ptp=IEEE1588-2008:7C-2E-0D-FF-FE-A7-23-B6:127\na=mediaclk:direct=0\na=ssrc:1258156108 cname:EB02FE63F5DB433DA6739B90A9B67B02"
       }

nodes/st2110in/main.cpp

@@ -103,10 +103,10 @@ class ST2110In : public NodeBase {
             return;
         }
 
-        log("SMPTE 2110-20 RX %s:%u from %s on %s local=%s %dx%d depth=%d @ %d/%d latency=%d index_mode=%s",
+        log("SMPTE 2110-20 RX %s:%u from %s on %s backend=%s local=%s %dx%d depth=%d @ %d/%d latency=%d index_mode=%s",
             cfg.mcast_ip.c_str(), cfg.udp_port, cfg.source_ip.c_str(), cfg.ifname.c_str(),
-            cfg.local_ip.c_str(), cfg.width, cfg.height, cfg.depth, cfg.fps_num, cfg.fps_den,
+            cfg.backend.c_str(), cfg.local_ip.c_str(), cfg.width, cfg.height, cfg.depth,
-            cfg.mxl_latency_frames, cfg.mxl_index_mode.c_str());
+            cfg.fps_num, cfg.fps_den, cfg.mxl_latency_frames, cfg.mxl_index_mode.c_str());
 
         try {
             MTLContext mtl(cfg);
@@ -129,9 +129,9 @@ class ST2110In : public NodeBase {
             uint64_t last_report_frames = 0;
             auto last_report = std::chrono::steady_clock::now();
 
-            log("MTL version=%s output_stride=%u input_stride=%u direct_v210=%d", mtl_version(),
+            log("MTL version=%s port=%s output_stride=%u input_stride=%u direct_v210=%d",
-                video_stride, cfg.direct_v210() ? video_stride : uyvy_stride,
+                mtl_version(), mtl.port_name().c_str(), video_stride,
-                cfg.direct_v210() ? 1 : 0);
+                cfg.direct_v210() ? video_stride : uyvy_stride, cfg.direct_v210() ? 1 : 0);
 
             while (g_running.load(std::memory_order_relaxed)) {
                 st_frame* frame = st20p_rx_get_frame(rx.get());

shared/ST2110Receiver.hpp

@@ -40,6 +40,8 @@ struct ST2110ReceiverConfig {
     int framebuff_cnt = 3;
     int mxl_latency_frames = 2;
     std::string mxl_index_mode = "rtp";
+    std::string backend = "kernel";
+    bool af_xdp_zero_copy = true;
 
     bool direct_v210() const { return depth == 10; }
     enum st20_fmt transport_fmt() const {
@@ -232,6 +234,8 @@ inline ST2110ReceiverConfig parse_st2110_receiver_config(const nlohmann::json& c
     out.framebuff_cnt = cfg.value("framebuff_cnt", out.framebuff_cnt);
     out.mxl_latency_frames = cfg.value("mxl_latency_frames", out.mxl_latency_frames);
     out.mxl_index_mode = cfg.value("mxl_index_mode", out.mxl_index_mode);
+    out.backend = cfg.value("backend", out.backend);
+    out.af_xdp_zero_copy = cfg.value("af_xdp_zero_copy", out.af_xdp_zero_copy);
 
     if (out.width <= 0 || out.height <= 0) {
         throw std::runtime_error("width and height must be positive");
@@ -257,6 +261,9 @@ inline ST2110ReceiverConfig parse_st2110_receiver_config(const nlohmann::json& c
     if (out.mxl_index_mode != "rtp" && out.mxl_index_mode != "live") {
         throw std::runtime_error("mxl_index_mode must be 'rtp' or 'live'");
     }
+    if (out.backend != "kernel" && out.backend != "af_xdp") {
+        throw std::runtime_error("backend must be 'kernel' or 'af_xdp'");
+    }
 
     return out;
 }
@@ -267,16 +274,25 @@ public:
         mtl_init_params params{};
         params.num_ports = 1;
 
-        port_name_ = "kernel:" + cfg.ifname;
+        if (cfg.backend == "kernel") {
+            port_name_ = "kernel:" + cfg.ifname;
+            params.pmd[MTL_PORT_P] = MTL_PMD_KERNEL_SOCKET;
+        } else if (cfg.backend == "af_xdp") {
+            port_name_ = "native_af_xdp:" + cfg.ifname;
+            params.pmd[MTL_PORT_P] = MTL_PMD_NATIVE_AF_XDP;
+            if (!cfg.af_xdp_zero_copy) {
+                params.flags |= MTL_FLAG_AF_XDP_ZC_DISABLE;
+            }
+        }
+
         std::snprintf(params.port[MTL_PORT_P], sizeof(params.port[MTL_PORT_P]), "%s",
                       port_name_.c_str());
 
-        params.pmd[MTL_PORT_P] = MTL_PMD_KERNEL_SOCKET;
         params.net_proto[MTL_PORT_P] = MTL_PROTO_STATIC;
         params.rx_queues_cnt[MTL_PORT_P] = 1;
         params.tx_queues_cnt[MTL_PORT_P] = 0;
         params.log_level = MTL_LOG_LEVEL_INFO;
-        params.flags = MTL_FLAG_DEV_AUTO_START_STOP;
+        params.flags |= MTL_FLAG_DEV_AUTO_START_STOP;
         st2110_set_ip(params.sip_addr[MTL_PORT_P], cfg.local_ip);
 
         handle_ = mtl_init(&params);