NVMe copy command acceleration
A data storage device includes a memory device and a controller coupled to the memory device. When a copy command is received by the controller from a host device, the controller reads the relevant data from one or more first locations of the memory device. The data is the processed by an Rx path, where the data is decoded, decrypted, and verified. Rather than providing the data back to the host device or being made available to the host device, a copy accelerator loops the data from the Rx path to a Tx path, where protection information is generated and added to the data and the data is encrypted and encoded. The data is then programmed back to the memory device in a second location. By using the copy accelerator, a latency associated with performing copy command operations and other data management operations may be decreased.
1. A data storage device, comprising:
a memory device; and
a controller coupled to the memory device, wherein the controller is configured to:
fetch data associated with a copy command operation from one or more first locations of the memory device;
perform a plurality of operations in an Rx path on the data, wherein an operation of the plurality of operations in the Rx path is decryption;
transfer the data from the Rx path to a Tx path in a loopback mode using a copy accelerator that is separate and distinct from a peripheral component interconnect express (PCIe) bus, wherein a storage tag module that is separate and distinct from the copy accelerator and separate and distinct from the PCIe bus checks protection information associated with the data and generates new protection information for the data;
perform a plurality of operations in the Tx path on the data, wherein an operation of the plurality of operations in the Tx path is encryption and wherein the decryption and the encryption are performed as a single atomic operation while looping back the data from the Rx path to the Tx path; and
program the data to a second location of the memory device.
2. The data storage device of claim 1 , wherein the loopback mode comprises not providing the data back to a host device between the Rx path and the Tx path.
3. The data storage device of claim 1 , wherein the plurality of operations in the Rx path comprises:
decoding the data;
decrypting the data; and
verifying protection information associated with the data.
4. The data storage device of claim 3 , wherein the decrypting uses a last generated key associated with the data.
5. The data storage device of claim 4 , wherein the controller is further configured to generate a key associated with the data when the data is encrypted.
6. The data storage device of claim 4 , wherein the plurality of operations in the Tx path comprises:
generating protection information for the data;
adding the generated protection information to the data;
encrypting the data; and
encoding the data.
7. The data storage device of claim 6 , wherein the generated protection information is generated based on a logical block address of the second location.
8. The data storage device of claim 6 , wherein the data programmed to the location of the memory device is the encoded data.
9. The data storage device of claim 1 , wherein the controller is further configured to check and update protection information associated with the data in the Rx path and the Tx path dynamically.
10. The data storage device of claim 1 , wherein the controller further comprises:
a peripheral component interconnect (PCI) express (PCIe) bus;
the Tx path coupled to the PCIe bus;
a flash interface module (FIM) coupled to the Tx path and the memory device; and
the Rx path coupled to the FIM and the PCIe.
11. The data storage device of claim 10 , wherein the Tx path comprises:
a Tx direct memory access (DMA) and data protection module;
an encryption engine configured to encrypt the data;
a redundant array of independent disks (RAID) engine; and
an encoder configured to encode the data.
12. The data storage device of claim 11 , wherein the Rx path comprises:
a decoder configured to decode the data received from the memory device;
a decryption engine configured to decrypt the data received from the decoder; and
an Rx DMA and data protection module.
13. The data storage device of claim 12 , wherein the storage tag module is configured to check a tag associated with the data, wherein the tag is provided by a host device associated with the data.
14. The data storage device of claim 12 , wherein the copy accelerator is configured to provide the decrypted data from the Rx DMA and protection module to the Tx DMA and protection module.
15. The data storage device of claim 14 , wherein the provided decrypted data is not accessible by a host device.
16. The data storage device of claim 10 , wherein the copy accelerator is used to move data from one or more first locations of the memory device to a second location of the memory device.