dwc: improve checksum offloading
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Authored by tuexen on Mon, Dec 29, 2:18 PM.

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	F141902220: D54395.diff
	Mon, Jan 12, 6:35 AM

	F141875779: D54395.diff
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timo.voelker_fh-muenster.de
manu
bnovkov
br

Summary

This patch provides two improvements for TCP/IPv4 and UDP/IPv4 checksum offloading:

Use *CIC_SEG instead of *CIC_FULL, since FreeBSD always provides a pseudo header checksum.
Don't make IPv4 header checksum offloading a prerequisite for TCP/IPv4 or UDP/IPv4 checksum offloading.

This is the root cause of PR 291696, since right now the epair interface does not support IPv4 header checksum offloading, but TCP/IPv4 and UDP/IPv4 checksum offloading.

Thanks to Marek Benc for reporting the issue and testing the fix.