Hi, >> I have searched the mailing list and know about the DPDK take buffer from >> VPP, Correct. VPP does two things to allow DPDK to use VPP buffers.
1. Register two mempool ops to DPDK namely “vpp” (cached/fast) and “vpp-no-cache” (non-cached/slow). See function dpdk_buffer_pool_create() in src/plugin/dpdk/buffer.c 2. For each VPP buffer pool (as per NUMA) create two mempools, one having mempool_ops set as “vpp” and other one having “vpp-no-cache” For each outgoing packet, non-cached mempool is used whenever there is (refcnt >1) (See dpdk_validate_rte_mbuf() function in src/plugins/dpdk/device/device.c). In case where refcnt >1, DPDK will end up calling enqueue/dequeue function of “vpp-no-cache” mempool ops, otherwise function of “vpp” mempool ops are called Bottom line, buffers will be freed to VPP pool only when mbuf.refcnt ==1. Thanks, Nitin From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of guangwei Sent: Wednesday, July 24, 2019 3:14 PM To: vpp-dev@lists.fd.io Subject: [EXT] [vpp-dev] VPP version 19.04 - Confusing with vlib_buffer and rte_mbuf (use DPDK as interface input) referent count operations #vpp External Email ________________________________ Hi, everyone I'am a newer with VPP architeture, I want't to use the vlib_buffer reference count(such as clone) to reduce the copies, but I'am confused with the referent count operations between the vlib_buffer and rte_mbuf (use DPDK as the interface input), I have searched the mailing list and know about the DPDK take buffer from VPP, but I'am still confused with these memory implementations, Is there anyone give some key points about the relationship between the rte_mbuf and vlib_buffer memory implementation, such as how DPDK take buffer from VPP and allocation/free between the two parts?
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