Yes, that should be the net effect, unless you have a very weird node hitting drivers tx-node directly - but you'd be aware of it if that's the case.
Best ben > -----Original Message----- > From: Prashant Upadhyaya <praupadhy...@gmail.com> > Sent: jeudi 6 janvier 2022 12:33 > To: Benoit Ganne (bganne) <bga...@cisco.com> > Cc: vpp-dev <vpp-dev@lists.fd.io> > Subject: Re: [vpp-dev] Prioritized packet sending > > Thanks Benoit, let me be more specific than last time -- > > Suppose my node is on the ip4-unicast feature arc and thus handling > the packets from ip4-input, say I get a frame here of 25 packets. > Now my node runs through these 25 packets, the first packet is special > and needs to go out on priority so I enqueue it to interface output at > L2 level like you said which is mighty fine. The node also finishes > the rest of packets processing and pushes them all to ip4-lookup for > further routing and sending. > In this scenario is it guaranteed that the first packet would be sent > out of the NIC first i.e. before the other 24 packets -- I am not > aware of the entire mechanics of the scheduling out here, but if > that's the net effect then that's exactly what I want. > > Regards > -Prashant > > On Thu, Jan 6, 2022 at 4:17 PM Benoit Ganne (bganne) <bga...@cisco.com> > wrote: > > > > Depends upon what you mean by "right now". > > The normal way to send a packet out in VPP is to just put the buffers to > the interface-output node with vlib_buffer_t.sw_if_index[VLIB_TX] set to > the correct interface. > > There will be some latency, as the interface-output node and then the > drivers node must run afterwards, but you'll skip any other nodes (eg. > let's say you're on the device-input feature arc and you want to skip the > whole L3 path - ip4-lookup and friends). > > > > Best > > ben > > > > > -----Original Message----- > > > From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Prashant > > > Upadhyaya > > > Sent: jeudi 6 janvier 2022 11:31 > > > To: vpp-dev <vpp-dev@lists.fd.io> > > > Subject: [vpp-dev] Prioritized packet sending > > > > > > Hi, > > > > > > Assume we are inside the code of a node in a plugin on a worker. > > > Normally we would do the packet processing the usual way, enqueue the > > > packets to various other nodes and return and the graph scheduler > > > would send the packets out as normal dispatch logic. > > > But what if from my node code, I want to send a packet out the NIC > > > like right now ? We can assume that I have the fully constructed L2 > > > packet with me. Is it possible to achieve this somehow from the plugin > > > node code so that this packet goes out right away and the rest of the > > > packets undergo the normal dispatch logic ? > > > > > > Regards > > > -Prashant
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