From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 9873E1B182 for ; Wed, 3 Oct 2018 15:07:06 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.25]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E849B80F96; Wed, 3 Oct 2018 13:07:05 +0000 (UTC) Received: from localhost (ovpn-117-117.ams2.redhat.com [10.36.117.117]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 297D42016BE2; Wed, 3 Oct 2018 13:06:55 +0000 (UTC) From: Jens Freimann To: dev@dpdk.org Cc: tiwei.bie@intel.com, maxime.coquelin@redhat.com, Gavin.Hu@arm.com Date: Wed, 3 Oct 2018 15:06:39 +0200 Message-Id: <20181003130646.20676-2-jfreimann@redhat.com> In-Reply-To: <20181003130646.20676-1-jfreimann@redhat.com> References: <20181003130646.20676-1-jfreimann@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.25 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Wed, 03 Oct 2018 13:07:06 +0000 (UTC) Subject: [dpdk-dev] [PATCH v7 1/8] net/virtio: vring init for packed queues X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Oct 2018 13:07:07 -0000 Add and initialize descriptor data structures. To allow out of order processing a .next field was added to struct vq_desc_extra because there is none in the packed virtqueue descriptor itself. This is used to chain descriptors and process them similiar to how it is handled for split virtqueues. Signed-off-by: Jens Freimann --- drivers/net/virtio/virtio_ethdev.c | 28 +++++++++------ drivers/net/virtio/virtio_pci.h | 8 +++++ drivers/net/virtio/virtio_ring.h | 55 +++++++++++++++++++++++++++--- drivers/net/virtio/virtqueue.h | 13 ++++++- 4 files changed, 88 insertions(+), 16 deletions(-) diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c index b81df0a99..d6a1613dd 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c @@ -299,19 +299,27 @@ virtio_init_vring(struct virtqueue *vq) PMD_INIT_FUNC_TRACE(); - /* - * Reinitialise since virtio port might have been stopped and restarted - */ memset(ring_mem, 0, vq->vq_ring_size); - vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN); + vring_init(vq->hw, vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN); + + vq->vq_free_cnt = vq->vq_nentries; + memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries); vq->vq_used_cons_idx = 0; + vq->vq_avail_idx = 0; vq->vq_desc_head_idx = 0; - vq->vq_avail_idx = 0; vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1); - vq->vq_free_cnt = vq->vq_nentries; - memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries); + if (vtpci_packed_queue(vq->hw)) { + uint16_t i; + for(i = 0; i < size - 1; i++) { + vq->vq_descx[i].next = i + 1; + vq->vq_ring.desc_packed[i].index = i; + } + vq->vq_ring.desc_packed[i].index = i; + vq->vq_descx[i].next = VQ_RING_DESC_CHAIN_END; + } else { - vring_desc_init(vr->desc, size); + vring_desc_init_split(vr->desc, size); + } /* * Disable device(host) interrupting guest @@ -386,7 +394,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx) /* * Reserve a memzone for vring elements */ - size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN); + size = vring_size(hw, vq_size, VIRTIO_PCI_VRING_ALIGN); vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN); PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d", size, vq->vq_ring_size); @@ -489,7 +497,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx) for (i = 0; i < vq_size; i++) { struct vring_desc *start_dp = txr[i].tx_indir; - vring_desc_init(start_dp, RTE_DIM(txr[i].tx_indir)); + vring_desc_init_split(start_dp, RTE_DIM(txr[i].tx_indir)); /* first indirect descriptor is always the tx header */ start_dp->addr = txvq->virtio_net_hdr_mem diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h index 58fdd3d45..90204d281 100644 --- a/drivers/net/virtio/virtio_pci.h +++ b/drivers/net/virtio/virtio_pci.h @@ -113,6 +113,8 @@ struct virtnet_ctl; #define VIRTIO_F_VERSION_1 32 #define VIRTIO_F_IOMMU_PLATFORM 33 +#define VIRTIO_F_RING_PACKED 34 +#define VIRTIO_F_IN_ORDER 35 /* * Some VirtIO feature bits (currently bits 28 through 31) are @@ -314,6 +316,12 @@ vtpci_with_feature(struct virtio_hw *hw, uint64_t bit) return (hw->guest_features & (1ULL << bit)) != 0; } +static inline int +vtpci_packed_queue(struct virtio_hw *hw) +{ + return vtpci_with_feature(hw, VIRTIO_F_RING_PACKED); +} + /* * Function declaration from virtio_pci.c */ diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h index 9e3c2a015..309069fdb 100644 --- a/drivers/net/virtio/virtio_ring.h +++ b/drivers/net/virtio/virtio_ring.h @@ -54,11 +54,38 @@ struct vring_used { struct vring_used_elem ring[0]; }; +/* For support of packed virtqueues in Virtio 1.1 the format of descriptors + * looks like this. + */ +struct vring_desc_packed { + uint64_t addr; + uint32_t len; + uint16_t index; + uint16_t flags; +} __attribute__ ((aligned(16))); + +#define RING_EVENT_FLAGS_ENABLE 0x0 +#define RING_EVENT_FLAGS_DISABLE 0x1 +#define RING_EVENT_FLAGS_DESC 0x2 +struct vring_packed_desc_event { + uint16_t desc_event_off_wrap; + uint16_t desc_event_flags; +}; + struct vring { unsigned int num; - struct vring_desc *desc; - struct vring_avail *avail; - struct vring_used *used; + union { + struct vring_desc_packed *desc_packed; + struct vring_desc *desc; + }; + union { + struct vring_avail *avail; + struct vring_packed_desc_event *driver_event; + }; + union { + struct vring_used *used; + struct vring_packed_desc_event *device_event; + }; }; /* The standard layout for the ring is a continuous chunk of memory which @@ -95,10 +122,18 @@ struct vring { #define vring_avail_event(vr) (*(uint16_t *)&(vr)->used->ring[(vr)->num]) static inline size_t -vring_size(unsigned int num, unsigned long align) +vring_size(struct virtio_hw *hw, unsigned int num, unsigned long align) { size_t size; + if (vtpci_packed_queue(hw)) { + size = num * sizeof(struct vring_desc_packed); + size += sizeof(struct vring_packed_desc_event); + size = RTE_ALIGN_CEIL(size, align); + size += sizeof(struct vring_packed_desc_event); + return size; + } + size = num * sizeof(struct vring_desc); size += sizeof(struct vring_avail) + (num * sizeof(uint16_t)); size = RTE_ALIGN_CEIL(size, align); @@ -108,10 +143,20 @@ vring_size(unsigned int num, unsigned long align) } static inline void -vring_init(struct vring *vr, unsigned int num, uint8_t *p, +vring_init(struct virtio_hw *hw, struct vring *vr, unsigned int num, uint8_t *p, unsigned long align) { vr->num = num; + if (vtpci_packed_queue(hw)) { + vr->desc_packed = (struct vring_desc_packed *)p; + vr->driver_event = (struct vring_packed_desc_event *)(p + + num * sizeof(struct vring_desc_packed)); + vr->device_event = (struct vring_packed_desc_event *) + RTE_ALIGN_CEIL((uintptr_t)(vr->driver_event + + sizeof(struct vring_packed_desc_event)), align); + return; + } + vr->desc = (struct vring_desc *) p; vr->avail = (struct vring_avail *) (p + num * sizeof(struct vring_desc)); diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h index 26518ed98..6a4f92b79 100644 --- a/drivers/net/virtio/virtqueue.h +++ b/drivers/net/virtio/virtqueue.h @@ -161,6 +161,7 @@ struct virtio_pmd_ctrl { struct vq_desc_extra { void *cookie; uint16_t ndescs; + uint16_t next; }; struct virtqueue { @@ -245,9 +246,19 @@ struct virtio_tx_region { __attribute__((__aligned__(16))); }; +static inline void +vring_desc_init_packed(struct vring *vr, int n) +{ + int i; + for (i = 0; i < n; i++) { + struct vring_desc_packed *desc = &vr->desc_packed[i]; + desc->index = i; + } +} + /* Chain all the descriptors in the ring with an END */ static inline void -vring_desc_init(struct vring_desc *dp, uint16_t n) +vring_desc_init_split(struct vring_desc *dp, uint16_t n) { uint16_t i; -- 2.17.1