ef5baf3486
There is a common macro __rte_packed for packing structs, which is now used where appropriate for consistency. Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
562 lines
16 KiB
C
562 lines
16 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2014 Intel Corporation
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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_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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#include "virtio_rxtx.h"
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struct rte_mbuf;
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/*
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* Per virtio_ring.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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* For using virtio to talk to real devices (eg. vDPA) we do need real
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* barriers.
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*/
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static inline void
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virtio_mb(uint8_t weak_barriers)
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{
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if (weak_barriers)
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rte_smp_mb();
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else
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rte_mb();
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}
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static inline void
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virtio_rmb(uint8_t weak_barriers)
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{
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if (weak_barriers)
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rte_smp_rmb();
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else
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rte_cio_rmb();
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}
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static inline void
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virtio_wmb(uint8_t weak_barriers)
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{
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if (weak_barriers)
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rte_smp_wmb();
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else
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rte_cio_wmb();
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}
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static inline uint16_t
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virtqueue_fetch_flags_packed(struct vring_packed_desc *dp,
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uint8_t weak_barriers)
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{
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uint16_t flags;
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if (weak_barriers) {
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/* x86 prefers to using rte_smp_rmb over __atomic_load_n as it reports
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* a better perf(~1.5%), which comes from the saved branch by the compiler.
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* The if and else branch are identical with the smp and cio barriers both
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* defined as compiler barriers on x86.
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*/
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#ifdef RTE_ARCH_X86_64
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flags = dp->flags;
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rte_smp_rmb();
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#else
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flags = __atomic_load_n(&dp->flags, __ATOMIC_ACQUIRE);
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#endif
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} else {
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flags = dp->flags;
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rte_cio_rmb();
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}
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return flags;
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}
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static inline void
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virtqueue_store_flags_packed(struct vring_packed_desc *dp,
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uint16_t flags, uint8_t weak_barriers)
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{
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if (weak_barriers) {
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/* x86 prefers to using rte_smp_wmb over __atomic_store_n as it reports
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* a better perf(~1.5%), which comes from the saved branch by the compiler.
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* The if and else branch are identical with the smp and cio barriers both
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* defined as compiler barriers on x86.
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*/
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#ifdef RTE_ARCH_X86_64
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rte_smp_wmb();
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dp->flags = flags;
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#else
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__atomic_store_n(&dp->flags, flags, __ATOMIC_RELEASE);
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#endif
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} else {
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rte_cio_wmb();
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dp->flags = flags;
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}
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}
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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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#ifdef RTE_VIRTIO_USER
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/**
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* Return the physical address (or virtual address in case of
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* virtio-user) of mbuf data buffer.
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*
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* The address is firstly casted to the word size (sizeof(uintptr_t))
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* before casting it to uint64_t. This is to make it work with different
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* combination of word size (64 bit and 32 bit) and virtio device
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* (virtio-pci and virtio-user).
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*/
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#define VIRTIO_MBUF_ADDR(mb, vq) \
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((uint64_t)(*(uintptr_t *)((uintptr_t)(mb) + (vq)->offset)))
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#else
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#define VIRTIO_MBUF_ADDR(mb, vq) ((mb)->buf_iova)
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#endif
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/**
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* Return the physical address (or virtual address in case of
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* virtio-user) of mbuf data buffer, taking care of mbuf data offset
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*/
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#define VIRTIO_MBUF_DATA_DMA_ADDR(mb, vq) \
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(VIRTIO_MBUF_ADDR(mb, vq) + (mb)->data_off)
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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[][RTE_ETHER_ADDR_LEN];
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} __rte_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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/*
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* Control link announce acknowledgement
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*
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* The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that
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* driver has recevied the notification; device would clear the
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* VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives
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* this command.
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*/
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#define VIRTIO_NET_CTRL_ANNOUNCE 3
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#define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0
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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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} __rte_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 vq_desc_extra {
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void *cookie;
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uint16_t ndescs;
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uint16_t next;
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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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union {
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struct {
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/**< vring keeping desc, used and avail */
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struct vring ring;
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} vq_split;
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struct {
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/**< vring keeping descs and events */
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struct vring_packed ring;
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bool used_wrap_counter;
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uint16_t cached_flags; /**< cached flags for descs */
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uint16_t event_flags_shadow;
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} vq_packed;
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};
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uint16_t vq_used_cons_idx; /**< last consumed descriptor */
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uint16_t vq_nentries; /**< vring desc numbers */
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uint16_t vq_free_cnt; /**< num of desc available */
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uint16_t vq_avail_idx; /**< sync until needed */
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uint16_t vq_free_thresh; /**< free threshold */
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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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union {
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struct virtnet_rx rxq;
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struct virtnet_tx txq;
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struct virtnet_ctl cq;
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};
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rte_iova_t vq_ring_mem; /**< physical address of vring,
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* or virtual address for virtio_user. */
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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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uint16_t vq_queue_index; /**< PCI queue index */
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uint16_t offset; /**< relative offset to obtain addr in mbuf */
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uint16_t *notify_addr;
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struct rte_mbuf **sw_ring; /**< RX software ring. */
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struct vq_desc_extra 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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/**
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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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#define VIRTIO_NET_HDR_F_DATA_VALID 2 /**< Checksum is valid */
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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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__rte_aligned(16);
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};
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static inline int
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desc_is_used(struct vring_packed_desc *desc, struct virtqueue *vq)
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{
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uint16_t used, avail, flags;
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flags = virtqueue_fetch_flags_packed(desc, vq->hw->weak_barriers);
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used = !!(flags & VRING_PACKED_DESC_F_USED);
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avail = !!(flags & VRING_PACKED_DESC_F_AVAIL);
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return avail == used && used == vq->vq_packed.used_wrap_counter;
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}
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static inline void
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vring_desc_init_packed(struct virtqueue *vq, int n)
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{
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int i;
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for (i = 0; i < n - 1; i++) {
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vq->vq_packed.ring.desc[i].id = i;
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vq->vq_descx[i].next = i + 1;
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}
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vq->vq_packed.ring.desc[i].id = i;
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vq->vq_descx[i].next = VQ_RING_DESC_CHAIN_END;
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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_split(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. Implementation for packed virtqueues.
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*/
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static inline void
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virtqueue_disable_intr_packed(struct virtqueue *vq)
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{
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if (vq->vq_packed.event_flags_shadow != RING_EVENT_FLAGS_DISABLE) {
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vq->vq_packed.event_flags_shadow = RING_EVENT_FLAGS_DISABLE;
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vq->vq_packed.ring.driver->desc_event_flags =
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vq->vq_packed.event_flags_shadow;
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}
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}
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/**
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* Tell the backend not to interrupt us. Implementation for split virtqueues.
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*/
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static inline void
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virtqueue_disable_intr_split(struct virtqueue *vq)
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{
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vq->vq_split.ring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
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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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static inline void
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virtqueue_disable_intr(struct virtqueue *vq)
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{
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if (vtpci_packed_queue(vq->hw))
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virtqueue_disable_intr_packed(vq);
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else
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virtqueue_disable_intr_split(vq);
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}
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/**
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* Tell the backend to interrupt. Implementation for packed virtqueues.
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*/
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static inline void
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virtqueue_enable_intr_packed(struct virtqueue *vq)
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{
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if (vq->vq_packed.event_flags_shadow == RING_EVENT_FLAGS_DISABLE) {
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vq->vq_packed.event_flags_shadow = RING_EVENT_FLAGS_ENABLE;
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vq->vq_packed.ring.driver->desc_event_flags =
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vq->vq_packed.event_flags_shadow;
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}
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}
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/**
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* Tell the backend to interrupt. Implementation for split virtqueues.
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*/
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static inline void
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virtqueue_enable_intr_split(struct virtqueue *vq)
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{
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vq->vq_split.ring.avail->flags &= (~VRING_AVAIL_F_NO_INTERRUPT);
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}
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/**
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* Tell the backend to interrupt us.
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*/
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static inline void
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virtqueue_enable_intr(struct virtqueue *vq)
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{
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if (vtpci_packed_queue(vq->hw))
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virtqueue_enable_intr_packed(vq);
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else
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virtqueue_enable_intr_split(vq);
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}
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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_detach_unused(struct virtqueue *vq);
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/* Flush the elements in the used ring. */
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void virtqueue_rxvq_flush(struct virtqueue *vq);
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int virtqueue_rxvq_reset_packed(struct virtqueue *vq);
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int virtqueue_txvq_reset_packed(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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static inline int
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virtio_get_queue_type(struct virtio_hw *hw, uint16_t vtpci_queue_idx)
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{
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if (vtpci_queue_idx == hw->max_queue_pairs * 2)
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return VTNET_CQ;
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else if (vtpci_queue_idx % 2 == 0)
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return VTNET_RQ;
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else
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return VTNET_TQ;
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}
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#define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_split.ring.used->idx - \
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(vq)->vq_used_cons_idx))
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void vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx);
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void vq_ring_free_chain_packed(struct virtqueue *vq, uint16_t used_idx);
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void vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx,
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uint16_t num);
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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(vq->hw->weak_barriers);
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vq->vq_split.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)
|
|
{
|
|
uint16_t avail_idx;
|
|
/*
|
|
* Place the head of the descriptor chain into the next slot and make
|
|
* it usable to the host. The chain is made available now rather than
|
|
* deferring to virtqueue_notify() in the hopes that if the host is
|
|
* currently running on another CPU, we can keep it processing the new
|
|
* descriptor.
|
|
*/
|
|
avail_idx = (uint16_t)(vq->vq_avail_idx & (vq->vq_nentries - 1));
|
|
if (unlikely(vq->vq_split.ring.avail->ring[avail_idx] != desc_idx))
|
|
vq->vq_split.ring.avail->ring[avail_idx] = desc_idx;
|
|
vq->vq_avail_idx++;
|
|
}
|
|
|
|
static inline int
|
|
virtqueue_kick_prepare(struct virtqueue *vq)
|
|
{
|
|
/*
|
|
* Ensure updated avail->idx is visible to vhost before reading
|
|
* the used->flags.
|
|
*/
|
|
virtio_mb(vq->hw->weak_barriers);
|
|
return !(vq->vq_split.ring.used->flags & VRING_USED_F_NO_NOTIFY);
|
|
}
|
|
|
|
static inline int
|
|
virtqueue_kick_prepare_packed(struct virtqueue *vq)
|
|
{
|
|
uint16_t flags;
|
|
|
|
/*
|
|
* Ensure updated data is visible to vhost before reading the flags.
|
|
*/
|
|
virtio_mb(vq->hw->weak_barriers);
|
|
flags = vq->vq_packed.ring.device->desc_event_flags;
|
|
|
|
return flags != RING_EVENT_FLAGS_DISABLE;
|
|
}
|
|
|
|
/*
|
|
* virtqueue_kick_prepare*() or the virtio_wmb() should be called
|
|
* before this function to be sure that all the data is visible to vhost.
|
|
*/
|
|
static inline void
|
|
virtqueue_notify(struct virtqueue *vq)
|
|
{
|
|
VTPCI_OPS(vq->hw)->notify_queue(vq->hw, vq);
|
|
}
|
|
|
|
#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
|
|
#define VIRTQUEUE_DUMP(vq) do { \
|
|
uint16_t used_idx, nused; \
|
|
used_idx = (vq)->vq_split.ring.used->idx; \
|
|
nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
|
|
if (vtpci_packed_queue((vq)->hw)) { \
|
|
PMD_INIT_LOG(DEBUG, \
|
|
"VQ: - size=%d; free=%d; used_cons_idx=%d; avail_idx=%d;" \
|
|
" cached_flags=0x%x; used_wrap_counter=%d", \
|
|
(vq)->vq_nentries, (vq)->vq_free_cnt, (vq)->vq_used_cons_idx, \
|
|
(vq)->vq_avail_idx, (vq)->vq_packed.cached_flags, \
|
|
(vq)->vq_packed.used_wrap_counter); \
|
|
break; \
|
|
} \
|
|
PMD_INIT_LOG(DEBUG, \
|
|
"VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
|
|
" avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
|
|
" avail.flags=0x%x; used.flags=0x%x", \
|
|
(vq)->vq_nentries, (vq)->vq_free_cnt, nused, \
|
|
(vq)->vq_desc_head_idx, (vq)->vq_split.ring.avail->idx, \
|
|
(vq)->vq_used_cons_idx, (vq)->vq_split.ring.used->idx, \
|
|
(vq)->vq_split.ring.avail->flags, (vq)->vq_split.ring.used->flags); \
|
|
} while (0)
|
|
#else
|
|
#define VIRTQUEUE_DUMP(vq) do { } while (0)
|
|
#endif
|
|
|
|
#endif /* _VIRTQUEUE_H_ */
|