From: Sivaprasad Tummala <sivaprasad.tumm...@intel.com> As of DPDK 19.11, in order to use dequeue-zero-copy in DPDK Vhost library, the application has to disable the linear buffer option. Hence dequeue-zero-copy is not supported for vhost application that requires linear buffers.
An alternative DPDK based approach to disable the linear buffers within the vhost library itself was proposed in [1], however the consensus was that application should be responsible for disabling linear buffers. As such this patch disables linear buffers when zero-copy is enabled. [1] https://patches.dpdk.org/patch/67200/ Fixes: 127b6a6eea02 ("dpdk: Update to use DPDK 19.11.") Signed-off-by: Sivaprasad Tummala <sivaprasad.tumm...@intel.com> --- lib/netdev-dpdk.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c index 44ebf96da..b940b1ac2 100644 --- a/lib/netdev-dpdk.c +++ b/lib/netdev-dpdk.c @@ -5059,6 +5059,12 @@ netdev_dpdk_vhost_client_reconfigure(struct netdev *netdev) /* Enable zero copy flag, if requested */ if (zc_enabled) { vhost_flags |= RTE_VHOST_USER_DEQUEUE_ZERO_COPY; + /* DPDK vHost library doesn't allow zero-copy with linear buffers. + * Hence disable Linear buffer. + */ + vhost_flags &= ~RTE_VHOST_USER_LINEARBUF_SUPPORT; + VLOG_WARN("Zero copy enabled, disabling linear buffer" + " check for vHost port %s", dev->up.name); } /* Enable External Buffers if TCP Segmentation Offload is enabled. */ -- 2.13.6 _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev
