Transitioning a buffer to be accessed exclusively by a driver layer for writing immediate data stream

A non-transitory machine-readable storage medium with instructions executable to at least partially implement an Internet Small Computer System Interface (iSCSI) driver, the instructions executable to:

• negotiate with a client device a number of simultaneous input/output (IO) commands allowed in a single session between the storage device and the client device;
• pre-allocate a subset of immediate data buffers for the single session based on the negotiated number of simultaneous I/O commands in response to receiving a session connection to the storage device from the client device;
• receive an I/O input comprising an I/O command and immediate data, wherein the immediate data is transmitted within a single protocol data unit (PDU) as the I/O command;
• transition the pre-allocated buffers to a driver state from a network interface state in an atomic operation, wherein the driver state enables that the pre-allocated buffers are accessed by a driver layer of the storage device exclusively, and wherein the atomic operation prevents other I/O commands from transitioning the network interface state of the pre-allocated buffers until the atomic operation is completed;
• and
• write the immediate data to the pre-allocated buffers in the driver state.

A computing device comprising:

• at least one processor;
• a non-transitory machine-readable storage medium comprising instructions executable by at least one processor to:
• negotiate with a client device a number of simultaneous inputs/outputs (IO) commands allowed in a single session between the memory storage array and a client device;
• search, in a first atomic operation, for a plurality of available immediate data buffers based on the negotiated number of I/O commands in response to receiving a session connection to the memory storage array from the client device;
• allocate, in the first atomic operation, the plurality of immediate data buffers for the single session;
• receive an I/O command and immediate data, wherein the immediate data is transmitted within a single protocol data unit (PDU) as the I/O command;
• switch, in a second atomic operation, a subset of the plurality of immediate data buffers to a driver state from a network interface state in an atomic operation, wherein the driver state enabling that the subset of immediate data buffers are accessed by a driver layer of the memory storage array exclusively, and wherein the atomic operation prevents other I/O commands from transitioning the network interface state of the pre-allocated buffers until the atomic operation is completed;
• and
• write the immediate data to the subset of immediate data buffers in the driver state.