Hardware Checksum Offload Support for NuttX Network Stack

[13627105546]

Note: Please adhere to Contributing Guidelines.

Summary

This PR introduces hardware checksum offload support to the NuttX network protocol stack, enabling network devices to perform checksum calculations in hardware rather than software.
Key Changes:

• Added NETDEV_TX_CSUM and NETDEV_RX_CSUM feature flags in netdev.h to indicate hardware checksum capabilities
• Implemented new checksum calculation functions ipv4_upperlayer_header_chksum() and ipv6_upperlayer_header_chksum()
• Modified TCP/UDP send and receive paths to conditionally use hardware or software checksum based on device capabilities
• Added netdev_checksum.c containing core checksum handling logic
• Fixed compilation errors and updated build system configuration (CMake/Makefile)

Impact

Build Impact:

• Adds new source file net/netdev/netdev_checksum.c
• Updates CMake and Makefile build configurations
• No impact on existing build processes for current configurations
  API Impact:
• Extends usage of d_features field in struct net_driver_s
• Introduces new checksum-related helper functions
• Maintains full compatibility with existing network APIs
  Runtime Impact:
• Network device drivers need to appropriately set NETDEV_TX_CSUM / NETDEV_RX_CSUM flags to enable hardware checksum
• For devices not setting these flags, behavior remains identical to previous implementation
• No breaking changes to existing network functionality

Testing

All existing network applications function correctly

[acassis]

Suggested change

	bool "netdev hardware checksum"
	bool "Enable support to netdev checksum in Hardware"

[acassis]

Since this is something that depends on chip supporting it, shouldn't it have a "depends on ARCH_HAVE_NETDEV_CHKSUM_HW" ?

@xiaoxiang781216 @raiden00pl please comment

[acassis]

@13627105546 since it is a new feature, please include basic Documentation to it. The documentation should be included at https://nuttx.apache.org/docs/latest/components/net/netdev.html as a new section

[acassis]

Please add Documentation

[linguini1]

All existing network applications function correctly

How did you quantify this? Which applications did you run, on what hardware, and how did you verify that they worked correctly?

[acassis]

All existing network applications function correctly

How did you quantify this? Which applications did you run, on what hardware, and how did you verify that they worked correctly?

@13627105546 the Testing should have the list of boards and applications you tested: i.e. tested on esp32-devkitc running iperf, thttpd, telnet, etc...