http://bugs.dpdk.org/show_bug.cgi?id=1840
Bug ID: 1840
Summary: net/pcap: missing read_clock operation
Product: DPDK
Version: 25.07
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
The pcap PMD provides receive timestamps from the pcap interface into the mbuf.
But there are a couple of issues with it.
The units of the timestamp are limited to microseconds now, but the pcap
library has a flag to provide nanosecond resolution. This should be used. One
caveat is that the API is misleading in reporting timestamp. The packet header
struct gives timestamp as a timeval (ie. usec) but if nanosecond mode flag is
used then the timestamp is really in timespec (ie nanoseconds).
The pcap PMD doesn't have a read_clock device operation so the application can
not determine the units of the receive timestamp. Pcap should behave like a
hardware PMD and return the underlying clock value.
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