Efficient packet re-transmission for express data paths
Embodiments of the present disclosure relate to determining modification bounds that identify portions of a packet that are safe to modify so that modified portions of the packet may be flushed from a cache to a memory of a network interface card (NIC) of a host system when the entire packet is synchronized from the NIC. A modification bound of the filter may be determined, and a network packet may be received from the NIC. In response to determining that the network packet is to be modified, a portion of the network packet that is safe to modify may be identified based on the modification bound of the filter and modifications may be made thereto. The modified portion of the network packet may be synchronized to the NIC.
1. A method comprising:
validating register values of a filter to determine a modification bound of the filter;
receiving a network packet from a network interface card (NIC);
determining, based on a handling of network packets indicated by the filter, whether the network packet is to be modified;
in response to determining that the network packet is to be modified, modifying a portion of the network packet based on the modification bound of the filter; and
synchronizing, by a processing device, the modified portion of the network packet to the NIC.
2. The method of claim 1 , wherein the modified portion of the network packet comprises a header of the network packet.
3. The method of claim 1 , wherein synchronizing the modified portion of the network packet to the NIC causes the NIC to transmit the network packet comprising the modified portion via a network.
4. The method of claim 1 , wherein synchronizing the modified portion of the network packet to the NIC comprises:
flushing the modified portion of the network packet from a cache operatively coupled to the processing device to the NIC.
5. The method of claim 1 , wherein the processing device is operatively coupled to one or more non-coherent direct-memory access devices.
6. The method of claim 1 , wherein receiving the network packet from the NIC comprises:
synchronizing, by the NIC, the network packet in its entirety to the processing device.
7. The method of claim 1 , wherein the modified portion of the network packet corresponds to the modification bound.
8. A system comprising:
a memory; and
a processing device operatively coupled to the memory, the processing device to:
validate register values of a filter to determine a modification bound of the filter;
receive a network packet from a network interface card (NIC);
determine, based on a handling of network packets indicated by the filter, whether the network packet is to be modified;
in response to determining that the network packet is to be modified, modify a portion of the network packet based on the modification bound of the filter; and
synchronize the modified portion of the network packet to the NIC.
9. The system of claim 8 , wherein the modified portion of the network packet comprises a header of the network packet.
10. The system of claim 8 , wherein synchronizing the modified portion of the network packet to the NIC causes the NIC to transmit the network packet comprising the modified portion via a network.
11. The system of claim 8 , wherein to synchronize the modified portion of the network packet to the NIC, the processing device is to:
flush the modified portion of the network packet from a cache operatively coupled to the processing device to the NIC.
12. The system of claim 8 , wherein the processing device is operatively coupled to one or more non-coherent direct-memory access devices.
13. The system of claim 8 , wherein the network packet is synchronized to the processing device in its entirety by the NIC.
14. The system of claim 8 , wherein the modified portion of the network packet corresponds to the modification bound.
15. A non-transitory computer-readable storage medium including instructions that, when executed by a processing device, cause the processing device to:
validate register values of a filter to determine a modification bound of the filter;
receive a network packet from a network interface card (NIC);
determine, based on a handling of network packets indicated by the filter, whether the network packet is to be modified;
in response to determining that the network packet is to be modified, modify a portion of the network packet based on the modification bound of the filter; and
synchronize, by the processing device, the modified portion of the network packet to the NIC.
16. The non-transitory computer-readable storage medium of claim 15 , wherein the modified portion of the network packet comprises a header of the network packet.
17. The non-transitory computer-readable storage medium of claim 15 , wherein synchronizing the modified portion of the network packet to the NIC causes the NIC to transmit the network packet comprising the modified portion via a network.
18. The non-transitory computer-readable storage medium of claim 15 , wherein to synchronize the modified portion of the network packet to the NIC, the processing device is to:
flush the modified portion of the network packet from a cache operatively coupled to the processing device to the NIC.
19. The non-transitory computer-readable storage medium of claim 15 , wherein the processing device is operatively coupled to one or more non-coherent direct-memory access devices.
20. The non-transitory computer-readable storage medium of claim 15 , wherein the network packet is synchronized to the processing device in its entirety by the NIC.