2e42b74a6f
netmap(4) support for vtnet(4) was incomplete and had multiple bugs.
This commit fixes those bugs to bring netmap on vtnet in a functional state.
Changelist:
- handle errors returned by virtqueue_enqueue() properly (they were
previously ignored)
- make sure netmap XOR rest of the kernel access each virtqueue.
- compute the number of netmap slots for TX and RX separately, according to
whether indirect descriptors are used or not for a given virtqueue.
- make sure sglist are freed according to their type (mbufs or netmap
buffers)
- add support for mulitiqueue and netmap host (aka sw) rings.
- intercept VQ interrupts directly instead of intercepting them in txq_eof
and rxq_eof. This simplifies the code and makes it easier to make sure
taskqueues are not running for a VQ while it is in netmap mode.
- implement vntet_netmap_config() to cope with changes in the number of queues.
Reviewed by: bryanv
Approved by: gnn (mentor)
MFC after: 3 days
Sponsored by: Sunny Valley Networks
Differential Revision: https://reviews.freebsd.org/D17916
368 lines
11 KiB
C
368 lines
11 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice unmodified, this list of conditions, and the following
|
|
* disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _IF_VTNETVAR_H
|
|
#define _IF_VTNETVAR_H
|
|
|
|
struct vtnet_softc;
|
|
|
|
struct vtnet_statistics {
|
|
uint64_t mbuf_alloc_failed;
|
|
|
|
uint64_t rx_frame_too_large;
|
|
uint64_t rx_enq_replacement_failed;
|
|
uint64_t rx_mergeable_failed;
|
|
uint64_t rx_csum_bad_ethtype;
|
|
uint64_t rx_csum_bad_ipproto;
|
|
uint64_t rx_csum_bad_offset;
|
|
uint64_t rx_csum_bad_proto;
|
|
uint64_t tx_csum_bad_ethtype;
|
|
uint64_t tx_tso_bad_ethtype;
|
|
uint64_t tx_tso_not_tcp;
|
|
uint64_t tx_defragged;
|
|
uint64_t tx_defrag_failed;
|
|
|
|
/*
|
|
* These are accumulated from each Rx/Tx queue.
|
|
*/
|
|
uint64_t rx_csum_failed;
|
|
uint64_t rx_csum_offloaded;
|
|
uint64_t rx_task_rescheduled;
|
|
uint64_t tx_csum_offloaded;
|
|
uint64_t tx_tso_offloaded;
|
|
uint64_t tx_task_rescheduled;
|
|
};
|
|
|
|
struct vtnet_rxq_stats {
|
|
uint64_t vrxs_ipackets; /* if_ipackets */
|
|
uint64_t vrxs_ibytes; /* if_ibytes */
|
|
uint64_t vrxs_iqdrops; /* if_iqdrops */
|
|
uint64_t vrxs_ierrors; /* if_ierrors */
|
|
uint64_t vrxs_csum;
|
|
uint64_t vrxs_csum_failed;
|
|
uint64_t vrxs_rescheduled;
|
|
};
|
|
|
|
struct vtnet_rxq {
|
|
struct mtx vtnrx_mtx;
|
|
struct vtnet_softc *vtnrx_sc;
|
|
struct virtqueue *vtnrx_vq;
|
|
struct sglist *vtnrx_sg;
|
|
int vtnrx_id;
|
|
struct vtnet_rxq_stats vtnrx_stats;
|
|
struct taskqueue *vtnrx_tq;
|
|
struct task vtnrx_intrtask;
|
|
#ifdef DEV_NETMAP
|
|
struct virtio_net_hdr_mrg_rxbuf vtnrx_shrhdr;
|
|
#endif /* DEV_NETMAP */
|
|
char vtnrx_name[16];
|
|
} __aligned(CACHE_LINE_SIZE);
|
|
|
|
#define VTNET_RXQ_LOCK(_rxq) mtx_lock(&(_rxq)->vtnrx_mtx)
|
|
#define VTNET_RXQ_UNLOCK(_rxq) mtx_unlock(&(_rxq)->vtnrx_mtx)
|
|
#define VTNET_RXQ_LOCK_ASSERT(_rxq) \
|
|
mtx_assert(&(_rxq)->vtnrx_mtx, MA_OWNED)
|
|
#define VTNET_RXQ_LOCK_ASSERT_NOTOWNED(_rxq) \
|
|
mtx_assert(&(_rxq)->vtnrx_mtx, MA_NOTOWNED)
|
|
|
|
struct vtnet_txq_stats {
|
|
uint64_t vtxs_opackets; /* if_opackets */
|
|
uint64_t vtxs_obytes; /* if_obytes */
|
|
uint64_t vtxs_omcasts; /* if_omcasts */
|
|
uint64_t vtxs_csum;
|
|
uint64_t vtxs_tso;
|
|
uint64_t vtxs_rescheduled;
|
|
};
|
|
|
|
struct vtnet_txq {
|
|
struct mtx vtntx_mtx;
|
|
struct vtnet_softc *vtntx_sc;
|
|
struct virtqueue *vtntx_vq;
|
|
struct sglist *vtntx_sg;
|
|
#ifndef VTNET_LEGACY_TX
|
|
struct buf_ring *vtntx_br;
|
|
#endif
|
|
int vtntx_id;
|
|
int vtntx_watchdog;
|
|
struct vtnet_txq_stats vtntx_stats;
|
|
struct taskqueue *vtntx_tq;
|
|
struct task vtntx_intrtask;
|
|
#ifndef VTNET_LEGACY_TX
|
|
struct task vtntx_defrtask;
|
|
#endif
|
|
#ifdef DEV_NETMAP
|
|
struct virtio_net_hdr_mrg_rxbuf vtntx_shrhdr;
|
|
#endif /* DEV_NETMAP */
|
|
char vtntx_name[16];
|
|
} __aligned(CACHE_LINE_SIZE);
|
|
|
|
#define VTNET_TXQ_LOCK(_txq) mtx_lock(&(_txq)->vtntx_mtx)
|
|
#define VTNET_TXQ_TRYLOCK(_txq) mtx_trylock(&(_txq)->vtntx_mtx)
|
|
#define VTNET_TXQ_UNLOCK(_txq) mtx_unlock(&(_txq)->vtntx_mtx)
|
|
#define VTNET_TXQ_LOCK_ASSERT(_txq) \
|
|
mtx_assert(&(_txq)->vtntx_mtx, MA_OWNED)
|
|
#define VTNET_TXQ_LOCK_ASSERT_NOTOWNED(_txq) \
|
|
mtx_assert(&(_txq)->vtntx_mtx, MA_NOTOWNED)
|
|
|
|
struct vtnet_softc {
|
|
device_t vtnet_dev;
|
|
struct ifnet *vtnet_ifp;
|
|
struct vtnet_rxq *vtnet_rxqs;
|
|
struct vtnet_txq *vtnet_txqs;
|
|
|
|
uint32_t vtnet_flags;
|
|
#define VTNET_FLAG_SUSPENDED 0x0001
|
|
#define VTNET_FLAG_MAC 0x0002
|
|
#define VTNET_FLAG_CTRL_VQ 0x0004
|
|
#define VTNET_FLAG_CTRL_RX 0x0008
|
|
#define VTNET_FLAG_CTRL_MAC 0x0010
|
|
#define VTNET_FLAG_VLAN_FILTER 0x0020
|
|
#define VTNET_FLAG_TSO_ECN 0x0040
|
|
#define VTNET_FLAG_MRG_RXBUFS 0x0080
|
|
#define VTNET_FLAG_LRO_NOMRG 0x0100
|
|
#define VTNET_FLAG_MULTIQ 0x0200
|
|
#define VTNET_FLAG_INDIRECT 0x0400
|
|
#define VTNET_FLAG_EVENT_IDX 0x0800
|
|
|
|
int vtnet_link_active;
|
|
int vtnet_hdr_size;
|
|
int vtnet_rx_process_limit;
|
|
int vtnet_rx_nsegs;
|
|
int vtnet_rx_nmbufs;
|
|
int vtnet_rx_clsize;
|
|
int vtnet_rx_new_clsize;
|
|
int vtnet_tx_intr_thresh;
|
|
int vtnet_tx_nsegs;
|
|
int vtnet_if_flags;
|
|
int vtnet_act_vq_pairs;
|
|
int vtnet_max_vq_pairs;
|
|
int vtnet_requested_vq_pairs;
|
|
|
|
struct virtqueue *vtnet_ctrl_vq;
|
|
struct vtnet_mac_filter *vtnet_mac_filter;
|
|
uint32_t *vtnet_vlan_filter;
|
|
|
|
uint64_t vtnet_features;
|
|
struct vtnet_statistics vtnet_stats;
|
|
struct callout vtnet_tick_ch;
|
|
struct ifmedia vtnet_media;
|
|
eventhandler_tag vtnet_vlan_attach;
|
|
eventhandler_tag vtnet_vlan_detach;
|
|
|
|
struct mtx vtnet_mtx;
|
|
char vtnet_mtx_name[16];
|
|
char vtnet_hwaddr[ETHER_ADDR_LEN];
|
|
};
|
|
|
|
/*
|
|
* Maximum number of queue pairs we will autoconfigure to.
|
|
*/
|
|
#define VTNET_MAX_QUEUE_PAIRS 8
|
|
|
|
/*
|
|
* Additional completed entries can appear in a virtqueue before we can
|
|
* reenable interrupts. Number of times to retry before scheduling the
|
|
* taskqueue to process the completed entries.
|
|
*/
|
|
#define VTNET_INTR_DISABLE_RETRIES 4
|
|
|
|
/*
|
|
* Similarly, additional completed entries can appear in a virtqueue
|
|
* between when lasted checked and before notifying the host. Number
|
|
* of times to retry before scheduling the taskqueue to process the
|
|
* queue.
|
|
*/
|
|
#define VTNET_NOTIFY_RETRIES 4
|
|
|
|
/*
|
|
* Fake the media type. The host does not provide us with any real media
|
|
* information.
|
|
*/
|
|
#define VTNET_MEDIATYPE (IFM_ETHER | IFM_10G_T | IFM_FDX)
|
|
|
|
/*
|
|
* Number of words to allocate for the VLAN shadow table. There is one
|
|
* bit for each VLAN.
|
|
*/
|
|
#define VTNET_VLAN_FILTER_NWORDS (4096 / 32)
|
|
|
|
/*
|
|
* When mergeable buffers are not negotiated, the vtnet_rx_header structure
|
|
* below is placed at the beginning of the mbuf data. Use 4 bytes of pad to
|
|
* both keep the VirtIO header and the data non-contiguous and to keep the
|
|
* frame's payload 4 byte aligned.
|
|
*
|
|
* When mergeable buffers are negotiated, the host puts the VirtIO header in
|
|
* the beginning of the first mbuf's data.
|
|
*/
|
|
#define VTNET_RX_HEADER_PAD 4
|
|
struct vtnet_rx_header {
|
|
struct virtio_net_hdr vrh_hdr;
|
|
char vrh_pad[VTNET_RX_HEADER_PAD];
|
|
} __packed;
|
|
|
|
/*
|
|
* For each outgoing frame, the vtnet_tx_header below is allocated from
|
|
* the vtnet_tx_header_zone.
|
|
*/
|
|
struct vtnet_tx_header {
|
|
union {
|
|
struct virtio_net_hdr hdr;
|
|
struct virtio_net_hdr_mrg_rxbuf mhdr;
|
|
} vth_uhdr;
|
|
|
|
struct mbuf *vth_mbuf;
|
|
};
|
|
|
|
/*
|
|
* The VirtIO specification does not place a limit on the number of MAC
|
|
* addresses the guest driver may request to be filtered. In practice,
|
|
* the host is constrained by available resources. To simplify this driver,
|
|
* impose a reasonably high limit of MAC addresses we will filter before
|
|
* falling back to promiscuous or all-multicast modes.
|
|
*/
|
|
#define VTNET_MAX_MAC_ENTRIES 128
|
|
|
|
struct vtnet_mac_table {
|
|
uint32_t nentries;
|
|
uint8_t macs[VTNET_MAX_MAC_ENTRIES][ETHER_ADDR_LEN];
|
|
} __packed;
|
|
|
|
struct vtnet_mac_filter {
|
|
struct vtnet_mac_table vmf_unicast;
|
|
uint32_t vmf_pad; /* Make tables non-contiguous. */
|
|
struct vtnet_mac_table vmf_multicast;
|
|
};
|
|
|
|
/*
|
|
* The MAC filter table is malloc(9)'d when needed. Ensure it will
|
|
* always fit in one segment.
|
|
*/
|
|
CTASSERT(sizeof(struct vtnet_mac_filter) <= PAGE_SIZE);
|
|
|
|
#define VTNET_TX_TIMEOUT 5
|
|
#define VTNET_CSUM_OFFLOAD (CSUM_TCP | CSUM_UDP | CSUM_SCTP)
|
|
#define VTNET_CSUM_OFFLOAD_IPV6 (CSUM_TCP_IPV6 | CSUM_UDP_IPV6 | CSUM_SCTP_IPV6)
|
|
|
|
#define VTNET_CSUM_ALL_OFFLOAD \
|
|
(VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6 | CSUM_TSO)
|
|
|
|
/* Features desired/implemented by this driver. */
|
|
#define VTNET_FEATURES \
|
|
(VIRTIO_NET_F_MAC | \
|
|
VIRTIO_NET_F_STATUS | \
|
|
VIRTIO_NET_F_CTRL_VQ | \
|
|
VIRTIO_NET_F_CTRL_RX | \
|
|
VIRTIO_NET_F_CTRL_MAC_ADDR | \
|
|
VIRTIO_NET_F_CTRL_VLAN | \
|
|
VIRTIO_NET_F_CSUM | \
|
|
VIRTIO_NET_F_GSO | \
|
|
VIRTIO_NET_F_HOST_TSO4 | \
|
|
VIRTIO_NET_F_HOST_TSO6 | \
|
|
VIRTIO_NET_F_HOST_ECN | \
|
|
VIRTIO_NET_F_GUEST_CSUM | \
|
|
VIRTIO_NET_F_GUEST_TSO4 | \
|
|
VIRTIO_NET_F_GUEST_TSO6 | \
|
|
VIRTIO_NET_F_GUEST_ECN | \
|
|
VIRTIO_NET_F_MRG_RXBUF | \
|
|
VIRTIO_NET_F_MQ | \
|
|
VIRTIO_RING_F_EVENT_IDX | \
|
|
VIRTIO_RING_F_INDIRECT_DESC)
|
|
|
|
/*
|
|
* The VIRTIO_NET_F_HOST_TSO[46] features permit us to send the host
|
|
* frames larger than 1514 bytes.
|
|
*/
|
|
#define VTNET_TSO_FEATURES (VIRTIO_NET_F_GSO | VIRTIO_NET_F_HOST_TSO4 | \
|
|
VIRTIO_NET_F_HOST_TSO6 | VIRTIO_NET_F_HOST_ECN)
|
|
|
|
/*
|
|
* The VIRTIO_NET_F_GUEST_TSO[46] features permit the host to send us
|
|
* frames larger than 1514 bytes. We do not yet support software LRO
|
|
* via tcp_lro_rx().
|
|
*/
|
|
#define VTNET_LRO_FEATURES (VIRTIO_NET_F_GUEST_TSO4 | \
|
|
VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN)
|
|
|
|
#define VTNET_MAX_MTU 65536
|
|
#define VTNET_MAX_RX_SIZE 65550
|
|
|
|
/*
|
|
* Used to preallocate the Vq indirect descriptors. The first segment
|
|
* is reserved for the header, except for mergeable buffers since the
|
|
* header is placed inline with the data.
|
|
*/
|
|
#define VTNET_MRG_RX_SEGS 1
|
|
#define VTNET_MIN_RX_SEGS 2
|
|
#define VTNET_MAX_RX_SEGS 34
|
|
#define VTNET_MIN_TX_SEGS 32
|
|
#define VTNET_MAX_TX_SEGS 64
|
|
|
|
/*
|
|
* Assert we can receive and transmit the maximum with regular
|
|
* size clusters.
|
|
*/
|
|
CTASSERT(((VTNET_MAX_RX_SEGS - 1) * MCLBYTES) >= VTNET_MAX_RX_SIZE);
|
|
CTASSERT(((VTNET_MAX_TX_SEGS - 1) * MCLBYTES) >= VTNET_MAX_MTU);
|
|
|
|
/*
|
|
* Number of slots in the Tx bufrings. This value matches most other
|
|
* multiqueue drivers.
|
|
*/
|
|
#define VTNET_DEFAULT_BUFRING_SIZE 4096
|
|
|
|
/*
|
|
* Determine how many mbufs are in each receive buffer. For LRO without
|
|
* mergeable buffers, we must allocate an mbuf chain large enough to
|
|
* hold both the vtnet_rx_header and the maximum receivable data.
|
|
*/
|
|
#define VTNET_NEEDED_RX_MBUFS(_sc, _clsize) \
|
|
((_sc)->vtnet_flags & VTNET_FLAG_LRO_NOMRG) == 0 ? 1 : \
|
|
howmany(sizeof(struct vtnet_rx_header) + VTNET_MAX_RX_SIZE, \
|
|
(_clsize))
|
|
|
|
#define VTNET_CORE_MTX(_sc) &(_sc)->vtnet_mtx
|
|
#define VTNET_CORE_LOCK(_sc) mtx_lock(VTNET_CORE_MTX((_sc)))
|
|
#define VTNET_CORE_UNLOCK(_sc) mtx_unlock(VTNET_CORE_MTX((_sc)))
|
|
#define VTNET_CORE_LOCK_DESTROY(_sc) mtx_destroy(VTNET_CORE_MTX((_sc)))
|
|
#define VTNET_CORE_LOCK_ASSERT(_sc) \
|
|
mtx_assert(VTNET_CORE_MTX((_sc)), MA_OWNED)
|
|
#define VTNET_CORE_LOCK_ASSERT_NOTOWNED(_sc) \
|
|
mtx_assert(VTNET_CORE_MTX((_sc)), MA_NOTOWNED)
|
|
|
|
#define VTNET_CORE_LOCK_INIT(_sc) do { \
|
|
snprintf((_sc)->vtnet_mtx_name, sizeof((_sc)->vtnet_mtx_name), \
|
|
"%s", device_get_nameunit((_sc)->vtnet_dev)); \
|
|
mtx_init(VTNET_CORE_MTX((_sc)), (_sc)->vtnet_mtx_name, \
|
|
"VTNET Core Lock", MTX_DEF); \
|
|
} while (0)
|
|
|
|
#endif /* _IF_VTNETVAR_H */
|