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
