libpcap: hw timestamps via adapter_unsynced do not work

[belinea123--- via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: belinea123 () gmx de
>
> Date: Fri, 11 Feb 2022 11:50:44 +0100
>
>
>  
> Hello list,
>  
> I use libpcap on linux to start a measurement on the PCIe NIC that my company developed. I set the tstamp type to 
> adapter_unsynced. pcap_set_tstamp_type returns with PCAP_WARNING_TSTAMP_TYPE_NOTSUP. The packets I receive in the 
> packet_handler function I registered contain a software timestamp (number of seconds sind 1970-01-01).
>  
> When I capture via tcpdump I get the correct hardware timestamps (number of seconds since the NIC was powered). I use 
> following command:
> sudo tcpdump -U -i eth0 -j adapter_unsynced -w log.pcap
>  
> Do you have an idea why libpcap does not read the hw timestamp but tcpdump does?
>  
> NIC tstamp capabilities:
>  
> Time stamping parameters for enp5s0f1:
> Capabilities:
>     hardware-transmit     (SOF_TIMESTAMPING_TX_HARDWARE)
>     software-transmit     (SOF_TIMESTAMPING_TX_SOFTWARE)
>     hardware-receive      (SOF_TIMESTAMPING_RX_HARDWARE)
>     software-receive      (SOF_TIMESTAMPING_RX_SOFTWARE)
>     software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
>     hardware-raw-clock    (SOF_TIMESTAMPING_RAW_HARDWARE)
> PTP Hardware Clock: none
> Hardware Transmit Timestamp Modes:
>     off                   (HWTSTAMP_TX_OFF)
>     on                    (HWTSTAMP_TX_ON)
> Hardware Receive Filter Modes:
>     none                  (HWTSTAMP_FILTER_NONE)
>     all                   (HWTSTAMP_FILTER_ALL)
>  
>  
>  
> pcap version:
> libpcap version 1.9.1 (with TPACKET_V3)
>  
> tcpdump version 4.9.3 (with libpcap 1.9.1 with TPACKET_V3)
>  
> Here is the code of my application:
>  
>
>         printf("pcap_create device: %s\n", deviceName.c_str());
>         handle = pcap_create(deviceName.c_str(), errbuf);
>         int returnVal = pcap_set_snaplen(handle, 65536);
>         if (returnVal != 0) printf("pcap_set_snaplen failed %s\n", pcap_geterr(handle));
>         returnVal = pcap_set_timeout(handle, 1000);
>         if (returnVal != 0) printf("pcap_set_timeout failed %s\n", pcap_geterr(handle));
>         returnVal = pcap_set_buffer_size(handle, 1000000);
>         if (returnVal != 0)
>             printf("pcap_set_buffer_size failed %s\n", pcap_geterr(handle));
>         returnVal = pcap_set_promisc(handle, 1);
>         if (returnVal != 0) printf("pcap_set_promisc failed %s\n", pcap_geterr(handle));
>         int* tstypes;
>         int ntstypes = pcap_list_tstamp_types(handle, &tstypes);
>         printf("pcap_list_tstamp_types: number: %d\n", ntstypes);
>         int requiredTimestampType = 0;
>         if(ntstypes > 0)
>         {
>             for(int i = 0; i < ntstypes; i++)
>             {
>                 const char* tsName = pcap_tstamp_type_val_to_name(tstypes[i]);
>                 printf("index: %d. name: %s\n", i, tsName);
>                 
>                 if(strcmp(tsName, "adapter_unsynced") == 0)
>                 {
>                      requiredTimestampType = i;
>                 }
>             }
>         }
>         
>         printf("requiredTimestampType: %d\n", requiredTimestampType);
>         returnVal = pcap_set_tstamp_type(handle, requiredTimestampType);
>         if (returnVal != 0)
>         {
>             printf("pcap_set_tstamp_type failed %s\n", pcap_geterr(handle));
>             
>             if(returnVal == PCAP_ERROR_ACTIVATED)
>                 printf("pcap_set_tstamp_type PCAP_ERROR_ACTIVATED\n");
>             else if(returnVal == PCAP_ERROR_CANTSET_TSTAMP_TYPE)
>                 printf("pcap_set_tstamp_type PCAP_ERROR_CANTSET_TSTAMP_TYPE\n");
>             else if(returnVal == PCAP_WARNING_TSTAMP_TYPE_NOTSUP)
>                 printf("pcap_set_tstamp_type PCAP_WARNING_TSTAMP_TYPE_NOTSUP\n");
>                 
>         }
>         else
>         {
>             printf("pcap_set_tstamp_type ok\n");
>         }
>         
>         pcap_free_tstamp_types(tstypes);
>         returnVal = pcap_activate(handle);
>  
>
>
>
> --- End Message ---
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