6dc5de3a6a
The virtio ring in QEMU/KVM is usually limited to 256 entries and the normal way that virtio driver was queuing mbufs required nsegs + 1 ring elements. By using the indirect ring element feature if available, each packet will take only one ring slot even for multi-segment packets. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Acked-by: Huawei Xie <huawei.xie@intel.com>
345 lines
11 KiB
C
345 lines
11 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _VIRTQUEUE_H_
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#define _VIRTQUEUE_H_
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#include <stdint.h>
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#include <rte_atomic.h>
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#include <rte_memory.h>
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#include <rte_memzone.h>
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#include <rte_mempool.h>
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#include "virtio_pci.h"
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#include "virtio_ring.h"
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#include "virtio_logs.h"
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struct rte_mbuf;
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/*
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* Per virtio_config.h in Linux.
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* For virtio_pci on SMP, we don't need to order with respect to MMIO
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* accesses through relaxed memory I/O windows, so smp_mb() et al are
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* sufficient.
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*
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*/
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#define virtio_mb() rte_smp_mb()
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#define virtio_rmb() rte_smp_rmb()
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#define virtio_wmb() rte_smp_wmb()
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#ifdef RTE_PMD_PACKET_PREFETCH
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#define rte_packet_prefetch(p) rte_prefetch1(p)
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#else
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#define rte_packet_prefetch(p) do {} while(0)
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#endif
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#define VIRTQUEUE_MAX_NAME_SZ 32
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#define VTNET_SQ_RQ_QUEUE_IDX 0
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#define VTNET_SQ_TQ_QUEUE_IDX 1
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#define VTNET_SQ_CQ_QUEUE_IDX 2
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enum { VTNET_RQ = 0, VTNET_TQ = 1, VTNET_CQ = 2 };
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/**
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* The maximum virtqueue size is 2^15. Use that value as the end of
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* descriptor chain terminator since it will never be a valid index
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* in the descriptor table. This is used to verify we are correctly
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* handling vq_free_cnt.
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*/
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#define VQ_RING_DESC_CHAIN_END 32768
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/**
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* Control the RX mode, ie. promiscuous, allmulti, etc...
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* All commands require an "out" sg entry containing a 1 byte
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* state value, zero = disable, non-zero = enable. Commands
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* 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
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* Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
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*/
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#define VIRTIO_NET_CTRL_RX 0
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#define VIRTIO_NET_CTRL_RX_PROMISC 0
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#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
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#define VIRTIO_NET_CTRL_RX_ALLUNI 2
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#define VIRTIO_NET_CTRL_RX_NOMULTI 3
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#define VIRTIO_NET_CTRL_RX_NOUNI 4
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#define VIRTIO_NET_CTRL_RX_NOBCAST 5
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/**
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* Control the MAC
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*
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* The MAC filter table is managed by the hypervisor, the guest should
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* assume the size is infinite. Filtering should be considered
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* non-perfect, ie. based on hypervisor resources, the guest may
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* received packets from sources not specified in the filter list.
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*
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* In addition to the class/cmd header, the TABLE_SET command requires
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* two out scatterlists. Each contains a 4 byte count of entries followed
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* by a concatenated byte stream of the ETH_ALEN MAC addresses. The
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* first sg list contains unicast addresses, the second is for multicast.
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* This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
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* is available.
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*
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* The ADDR_SET command requests one out scatterlist, it contains a
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* 6 bytes MAC address. This functionality is present if the
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* VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
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*/
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struct virtio_net_ctrl_mac {
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uint32_t entries;
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uint8_t macs[][ETHER_ADDR_LEN];
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} __attribute__((__packed__));
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#define VIRTIO_NET_CTRL_MAC 1
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#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
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#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
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/**
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* Control VLAN filtering
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*
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* The VLAN filter table is controlled via a simple ADD/DEL interface.
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* VLAN IDs not added may be filtered by the hypervisor. Del is the
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* opposite of add. Both commands expect an out entry containing a 2
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* byte VLAN ID. VLAN filtering is available with the
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* VIRTIO_NET_F_CTRL_VLAN feature bit.
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*/
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#define VIRTIO_NET_CTRL_VLAN 2
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#define VIRTIO_NET_CTRL_VLAN_ADD 0
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#define VIRTIO_NET_CTRL_VLAN_DEL 1
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struct virtio_net_ctrl_hdr {
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uint8_t class;
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uint8_t cmd;
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} __attribute__((packed));
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typedef uint8_t virtio_net_ctrl_ack;
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#define VIRTIO_NET_OK 0
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#define VIRTIO_NET_ERR 1
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#define VIRTIO_MAX_CTRL_DATA 2048
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struct virtio_pmd_ctrl {
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struct virtio_net_ctrl_hdr hdr;
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virtio_net_ctrl_ack status;
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uint8_t data[VIRTIO_MAX_CTRL_DATA];
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};
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struct virtqueue {
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struct virtio_hw *hw; /**< virtio_hw structure pointer. */
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const struct rte_memzone *mz; /**< mem zone to populate RX ring. */
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const struct rte_memzone *virtio_net_hdr_mz; /**< memzone to populate hdr. */
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struct rte_mempool *mpool; /**< mempool for mbuf allocation */
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uint16_t queue_id; /**< DPDK queue index. */
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uint8_t port_id; /**< Device port identifier. */
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uint16_t vq_queue_index; /**< PCI queue index */
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void *vq_ring_virt_mem; /**< linear address of vring*/
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unsigned int vq_ring_size;
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phys_addr_t vq_ring_mem; /**< physical address of vring */
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struct vring vq_ring; /**< vring keeping desc, used and avail */
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uint16_t vq_free_cnt; /**< num of desc available */
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uint16_t vq_nentries; /**< vring desc numbers */
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uint16_t vq_free_thresh; /**< free threshold */
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/**
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* Head of the free chain in the descriptor table. If
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* there are no free descriptors, this will be set to
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* VQ_RING_DESC_CHAIN_END.
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*/
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uint16_t vq_desc_head_idx;
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uint16_t vq_desc_tail_idx;
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/**
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* Last consumed descriptor in the used table,
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* trails vq_ring.used->idx.
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*/
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uint16_t vq_used_cons_idx;
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uint16_t vq_avail_idx;
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uint64_t mbuf_initializer; /**< value to init mbufs. */
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phys_addr_t virtio_net_hdr_mem; /**< hdr for each xmit packet */
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struct rte_mbuf **sw_ring; /**< RX software ring. */
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/* dummy mbuf, for wraparound when processing RX ring. */
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struct rte_mbuf fake_mbuf;
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/* Statistics */
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uint64_t packets;
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uint64_t bytes;
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uint64_t errors;
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uint64_t multicast;
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uint64_t broadcast;
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/* Size bins in array as RFC 2819, undersized [0], 64 [1], etc */
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uint64_t size_bins[8];
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uint16_t *notify_addr;
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struct vq_desc_extra {
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void *cookie;
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uint16_t ndescs;
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} vq_descx[0];
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};
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/* If multiqueue is provided by host, then we suppport it. */
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#define VIRTIO_NET_CTRL_MQ 4
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
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#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
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/**
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* This is the first element of the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header.
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*/
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struct virtio_net_hdr {
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#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /**< Use csum_start,csum_offset*/
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uint8_t flags;
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#define VIRTIO_NET_HDR_GSO_NONE 0 /**< Not a GSO frame */
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#define VIRTIO_NET_HDR_GSO_TCPV4 1 /**< GSO frame, IPv4 TCP (TSO) */
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#define VIRTIO_NET_HDR_GSO_UDP 3 /**< GSO frame, IPv4 UDP (UFO) */
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#define VIRTIO_NET_HDR_GSO_TCPV6 4 /**< GSO frame, IPv6 TCP */
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#define VIRTIO_NET_HDR_GSO_ECN 0x80 /**< TCP has ECN set */
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uint8_t gso_type;
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uint16_t hdr_len; /**< Ethernet + IP + tcp/udp hdrs */
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uint16_t gso_size; /**< Bytes to append to hdr_len per frame */
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uint16_t csum_start; /**< Position to start checksumming from */
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uint16_t csum_offset; /**< Offset after that to place checksum */
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};
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/**
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* This is the version of the header to use when the MRG_RXBUF
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* feature has been negotiated.
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*/
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struct virtio_net_hdr_mrg_rxbuf {
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struct virtio_net_hdr hdr;
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uint16_t num_buffers; /**< Number of merged rx buffers */
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};
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/* Region reserved to allow for transmit header and indirect ring */
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#define VIRTIO_MAX_TX_INDIRECT 8
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struct virtio_tx_region {
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struct virtio_net_hdr_mrg_rxbuf tx_hdr;
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struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
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__attribute__((__aligned__(16)));
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};
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/* Chain all the descriptors in the ring with an END */
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static inline void
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vring_desc_init(struct vring_desc *dp, uint16_t n)
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{
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uint16_t i;
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for (i = 0; i < n - 1; i++)
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dp[i].next = (uint16_t)(i + 1);
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dp[i].next = VQ_RING_DESC_CHAIN_END;
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}
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/**
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* Tell the backend not to interrupt us.
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*/
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void virtqueue_disable_intr(struct virtqueue *vq);
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/**
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* Dump virtqueue internal structures, for debug purpose only.
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*/
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void virtqueue_dump(struct virtqueue *vq);
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/**
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* Get all mbufs to be freed.
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*/
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struct rte_mbuf *virtqueue_detatch_unused(struct virtqueue *vq);
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static inline int
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virtqueue_full(const struct virtqueue *vq)
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{
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return vq->vq_free_cnt == 0;
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}
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#define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
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static inline void
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vq_update_avail_idx(struct virtqueue *vq)
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{
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virtio_wmb();
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vq->vq_ring.avail->idx = vq->vq_avail_idx;
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}
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static inline void
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vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx)
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{
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uint16_t avail_idx;
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/*
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* Place the head of the descriptor chain into the next slot and make
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* it usable to the host. The chain is made available now rather than
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* deferring to virtqueue_notify() in the hopes that if the host is
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* currently running on another CPU, we can keep it processing the new
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* descriptor.
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*/
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avail_idx = (uint16_t)(vq->vq_avail_idx & (vq->vq_nentries - 1));
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vq->vq_ring.avail->ring[avail_idx] = desc_idx;
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vq->vq_avail_idx++;
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}
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static inline int
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virtqueue_kick_prepare(struct virtqueue *vq)
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{
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return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
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}
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static inline void
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virtqueue_notify(struct virtqueue *vq)
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{
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/*
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* Ensure updated avail->idx is visible to host.
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* For virtio on IA, the notificaiton is through io port operation
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* which is a serialization instruction itself.
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*/
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vq->hw->vtpci_ops->notify_queue(vq->hw, vq);
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}
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#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
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#define VIRTQUEUE_DUMP(vq) do { \
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uint16_t used_idx, nused; \
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used_idx = (vq)->vq_ring.used->idx; \
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nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
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PMD_INIT_LOG(DEBUG, \
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"VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
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" avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
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" avail.flags=0x%x; used.flags=0x%x", \
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(vq)->vq_nentries, (vq)->vq_free_cnt, nused, \
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(vq)->vq_desc_head_idx, (vq)->vq_ring.avail->idx, \
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(vq)->vq_used_cons_idx, (vq)->vq_ring.used->idx, \
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(vq)->vq_ring.avail->flags, (vq)->vq_ring.used->flags); \
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} while (0)
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#else
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#define VIRTQUEUE_DUMP(vq) do { } while (0)
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#endif
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#endif /* _VIRTQUEUE_H_ */
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