That's pretty clear. Thank you. Dimitris On Thu, Mar 19, 2020 at 6:52 AM Jason Gunthorpe <jgg@xxxxxxxx> wrote: > > On Wed, Mar 18, 2020 at 04:07:37PM -0700, Dimitris Dimitropoulos wrote: > > Hi, > > > > I'm looking at UDP using the IB verbs library. If I send UDP packets > > that are intercepted by the IB verbs layer, what happens with the > > completion notifications ? > > Each recv that requests a completion gets a completion. > > > For example, say I create a list of 10 ibv_recv_wr objects and each > > has num_sge = 30, with each SGE having a 4K size. And I setup for > > reception with ibv_post_recv(). If I transmit 30 UDP packets each 4K > > in size will I receive one CQ event ? Or 30 ? > > One per ibv_recv_wr requesting completion > > > Will the UDP packets be written in consecutive SGEs of the first > > ibv_recv_wr object ? Or will they be written in consecutive > > ibv_recv_wr objects (in their first SGE) ? > > Only the first. Each recv handles a single incoming packet. > > DPDK has a hyper-optimized version of processing IP/UDP packets via > mlx5dv > > Jason
