Initial release: NCCL Mesh Plugin for direct-connect RDMA topologies

- Enables NCCL over multi-subnet mesh topologies
- 8+ GB/s bandwidth over 100Gbps RDMA
- Successfully tested with distributed LLM inference (Mistral-7B)
- Custom subnet-aware NIC selection
- Background handshake thread for deadlock-free connection setup

Makefile

@@ -0,0 +1,56 @@
+# NCCL Mesh Plugin Makefile
+
+CC = gcc
+CFLAGS = -Wall -Wextra -O2 -fPIC -g
+CFLAGS += -I. -I./include
+LDFLAGS = -shared -libverbs -lpthread
+
+# Target
+TARGET = libnccl-net.so
+TARGET_MESH = libnccl-net-mesh.so
+
+# Sources
+SRCS = src/mesh_plugin.c
+OBJS = $(SRCS:.c=.o)
+
+# Default target
+all: $(TARGET) $(TARGET_MESH)
+
+$(TARGET): $(OBJS)
+	$(CC) $(OBJS) -o $@ $(LDFLAGS)
+
+$(TARGET_MESH): $(TARGET)
+	ln -sf $(TARGET) $(TARGET_MESH)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+# Install to a standard location
+PREFIX ?= /usr/local
+install: all
+	install -d $(PREFIX)/lib
+	install -m 755 $(TARGET) $(PREFIX)/lib/
+	ln -sf $(TARGET) $(PREFIX)/lib/$(TARGET_MESH)
+
+# Clean
+clean:
+	rm -f $(OBJS) $(TARGET) $(TARGET_MESH)
+
+# Test build (requires libibverbs-dev)
+test-deps:
+	@echo "Checking dependencies..."
+	@pkg-config --exists libibverbs || (echo "ERROR: libibverbs-dev not found" && exit 1)
+	@echo "All dependencies found."
+
+# Debug build
+debug: CFLAGS += -DDEBUG -g3 -O0
+debug: clean all
+
+# Print configuration
+info:
+	@echo "CC      = $(CC)"
+	@echo "CFLAGS  = $(CFLAGS)"
+	@echo "LDFLAGS = $(LDFLAGS)"
+	@echo "TARGET  = $(TARGET)"
+
+.PHONY: all clean install test-deps debug info