NVMe over Fabric Buffer Control via Storage Space Detection

The patent introduces a buffer status notification mechanism as an intermediary between the network adapter and the host. The network adapter notifies the host about buffer status (full, empty, partially filled), and the host adjusts its command sending accordingly. This intermediary communication layer simplifies the overall system by providing clear status signals rather than requiring complex embedded logic within the network adapter to manage buffer overflow/underflow conditions.

The host system is empowered to self-regulate its command sending based on buffer status notifications. Instead of the network adapter actively managing and buffering commands (which increases its complexity), the host monitors buffer status and controls its own command flow. This shifts the burden of buffer management to the host, allowing the network adapter to remain simpler and more maintainable.

The patent implements a feedback mechanism where the network adapter continuously monitors its buffer status and sends notifications to the host. When the buffer is full or empty, the adapter notifies the host to pause or resume command sending. This real-time feedback loop ensures that commands are only sent when the buffer can accommodate them, preventing execution failures while maintaining high data transmission efficiency when buffer space is available.

The system performs preliminary checks of buffer status before command execution. The host checks buffer status notifications before sending commands, and the network adapter checks buffer availability before accepting new commands. This preliminary verification prevents situations where commands would fail due to insufficient storage space, thereby improving command execution reliability without significantly impacting overall productivity.

The host performs preliminary checks of buffer status before sending commands, preventing buffer overflow before it occurs. By checking whether the buffer has sufficient space in advance and only sending commands when appropriate, the system avoids the need for time-consuming waiting and reallocation operations, thereby maintaining both reliability and processing speed.

The feedback-based buffer management enables continuous useful action by keeping the data transmission pipeline flowing smoothly. The host continuously monitors buffer status notifications and adjusts its command sending to match buffer availability, ensuring that the buffer is consistently utilized without overflow or unnecessary idle time. This continuous adaptation maintains high productivity while ensuring reliable data buffering.