Ok, let me check again, the reason I don't suspect the packet is because, if I disable DPDK optimization (directly feed to ip4-no-checksum) - the packets are getting processed fine without any issues.
Thanks, -nagp On Tue, May 9, 2017 at 3:09 PM, Damjan Marion (damarion) <damar...@cisco.com > wrote: > dpdk_rx_next_from_etype () will return value different > than VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT _only_ if ethertype is > ETHERNET_TYPE_IP4, ETHERNET_TYPE_IP6 or ETHERNET_TYPE_MPLS. > > So looks like ethertype in your packet is set to one of three listed > above, which is wrong. > > On 9 May 2017, at 10:27, Nagaprabhanjan Bellaru <nagp.li...@gmail.com> > wrote: > > Yes, it is set correctly. To validate it, I bypassed the dpdk optimization > and fed every packet to ethernet-input (by making "dpdk_rx_next_from_etype" > always return VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT). Then things started > working fine - packets getting classified to correct sw_if_index, ip header > pointing to beginning of ip header etc. > > I am referring to the way l3_offset is set by looking up > device_input_next_node_advance[next] - there is no check to skip the vlan > header - can you please point me to the code snippet in dpdk_device_input > which does that? "vnet_feature_start_device_input" does not seem to be > doing anything here.. > > Thanks, > -nagp > > On Mon, May 8, 2017 at 7:32 PM, Damjan Marion (damarion) < > damar...@cisco.com> wrote: > >> > >> > On 3 May 2017, at 13:28, Nagaprabhanjan Bellaru <nagp.li...@gmail.com> >> wrote: >> > >> > Hi, >> > >> > It looks like dpdk_device_input() - is not checking if there is a vlan >> header in the packet or not and always sets the buffer->current_data to 14 >> (smac+dmac+ethtype). Because of that ip4_input is not able to recognize a >> correct IP packet. >> > >> > For example, I have a subinterface created with vlan100 - which is >> trying to send IP packets. The receiving side is setting l3offset to 14 and >> feeding the packet to ip4-input-no-checksum and is getting dropped there. >> > >> > Am I missing something? "show interface" shows the main and the sub >> interface. "show trace" for dpdk_input shows the vlan tag as 100. But >> ip4_input_inline gets a buffer with current_data as 14 instead of 18 >> (accounting for vlan header) >> >> We do respect VLAN ethertypes, is your ethertype set correctly? >> >> > >
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