Add NVLink

include/nvtop/extract_gpuinfo_common.h

@@ -240,4 +240,35 @@ inline unsigned busy_usage_from_time_usage_round(uint64_t current_use_ns, uint64
 
 unsigned nvtop_pcie_gen_from_link_speed(unsigned linkSpeed);
 
+// NVLink support
+#define NVTOP_NVLINK_MAX_LINKS 36
+
+struct nvlink_info {
+  unsigned num_links;                 // Number of NVLink links on this device
+  unsigned version;                   // NVLink version (e.g. 3 for NVLink 3.0)
+  bool supported;                     // NVLink is supported on this device
+  bool has_throughput;                // Whether throughput data was available this cycle
+  unsigned long long aggregate_tx;    // Aggregate TX throughput across all links (KiB/s)
+  unsigned long long aggregate_rx;    // Aggregate RX throughput across all links (KiB/s)
+  unsigned long long total_errors;    // Cumulative-since-launch errors across all links
+  unsigned long long total_corrections; // Cumulative-since-launch CRC corrections across all links
+  unsigned long long total_ecc_errors; // Cumulative-since-launch ECC data errors across all links
+};
+
+unsigned nvtop_get_nvlink_info(struct gpu_info *gpu_info, struct nvlink_info *nvlink_info);
+
+// Get display-ready NVLink error/correction/ECC counts from the per-device persistent struct.
+// Returns true if baseline has been established at least once.
+bool nvtop_get_nvlink_error_counts(struct gpu_info *gpu_info,
+                                    unsigned long long *out_errors,
+                                    unsigned long long *out_corrections,
+                                    unsigned long long *out_ecc);
+
+// NVLink probe — call before initialize_curses to set layout mode
+bool nvtop_probe_nvlink_list(struct list_head *devices);
+
+// Reset per-GPU NVLink cache (probed flag, cached linkcount/version, cached info struct).
+// Call when the monitored device set changes so newly-monitored NVLink GPUs get probed fresh.
+void nvtop_reset_nvlink_cache(struct gpu_info *gpu_info);
+
 #endif // EXTRACT_GPUINFO_COMMON_H__

include/nvtop/interface_internal_common.h

@@ -70,9 +70,11 @@ struct device_window {
   WINDOW *gpu_clock_info;
   WINDOW *mem_clock_info;
   WINDOW *pcie_info;
+  WINDOW *nvlink_info;
   WINDOW *shader_cores;
   WINDOW *l2_cache_size;
   WINDOW *exec_engines;
+  WINDOW *nvlink_errors;
   bool enc_was_visible;
   bool dec_was_visible;
   nvtop_time last_decode_seen;
@@ -154,6 +156,7 @@ enum device_field {
   device_shadercores,
   device_l2features,
   device_execengines,
+  device_nvlink_errors,
   device_field_count,
 };
 

src/CMakeLists.txt

@@ -52,6 +52,8 @@ endif()
 
 if(NVIDIA_SUPPORT)
   target_sources(nvtop PRIVATE extract_gpuinfo_nvidia.c)
+else()
+  target_sources(nvtop PRIVATE nvlink_nvidia_disabled.c)
 endif()
 
 if(ASCEND_SUPPORT)