From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Freimann Subject: [PATCH v8 0/8] implement packed virtqueues Date: Tue, 16 Oct 2018 11:01:26 +0200 Message-ID: <20181016090134.29448-1-jfreimann@redhat.com> Cc: tiwei.bie@intel.com, maxime.coquelin@redhat.com, Gavin.Hu@arm.com To: dev@dpdk.org Return-path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id B15D41E2F for ; Tue, 16 Oct 2018 11:01:40 +0200 (CEST) List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" This is a basic implementation of packed virtqueues as specified in the Virtio 1.1 draft. A compiled version of the current draft is available at https://github.com/oasis-tcs/virtio-docs.git (or as .pdf at https://github.com/oasis-tcs/virtio-docs/blob/master/virtio-v1.1-packed-wd10.pdf A packed virtqueue is different from a split virtqueue in that it consists of only a single descriptor ring that replaces available and used ring, index and descriptor pointers. Each descriptor is readable and writable and has a flags field. These flags will mark if a descriptor is available or used. To detect new available descriptors even after the ring has wrapped, device and driver each have a single-bit wrap counter that is flipped from 0 to 1 and vice versa every time the last descriptor in the ring is used/made available. v7->v8: * move desc_is_used change to correct patch * remove trailing newline * correct xmit code, flags update and memory barrier * move packed desc init to dedicated function, split and packed variant Jens Freimann (8): net/virtio: vring init for packed queues net/virtio: add packed virtqueue defines net/virtio: add packed virtqueue helpers net/virtio: dump packed virtqueue data net/virtio: implement transmit path for packed queues net/virtio: implement receive path for packed queues net/virtio: add virtio send command packed queue support net/virtio: enable packed virtqueues by default drivers/net/virtio/virtio_ethdev.c | 154 ++++++-- drivers/net/virtio/virtio_ethdev.h | 5 + drivers/net/virtio/virtio_pci.h | 7 + drivers/net/virtio/virtio_ring.h | 110 +++++- drivers/net/virtio/virtio_rxtx.c | 545 +++++++++++++++++++++++++++-- drivers/net/virtio/virtqueue.c | 23 ++ drivers/net/virtio/virtqueue.h | 42 ++- 7 files changed, 832 insertions(+), 54 deletions(-) -- 2.17.1