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Catch up with Bryan Venteicher's virtio Hg repo:

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c162516
  Remove vtblk_sector_size

c162515
  Wrap long license lines

c162514
  Remove vtblk_unit

c162513
  Wrap long lines in the license.

c162512
  Remove verbose messages when link goes up/down.

  A similar message is printed elsewhere as a result of
  if_link_state_change().

c162511
  Explicity compare pointer to NULL

c162510
  Allocate the mac filter table at attach time.

c162509
  Add real BSD licenses to the header files copied from Linux.

  The chases upstream changes made in Linux awhile ago.

c162508
  Only notify if we actually dequeued something.

c162507
  Change a couple of if () { KASSERT(...) } to just KASSERTs.

  In non-debug kernels, the if() { } probably get optomized
  away, but I guess this is clearer.

c162506
  Remove VIRTIO_BLK_F_TOPOLOGY fields in the config.

  TOPOLOGY has since been removed from the spec, and the FreeBSD
  didn't really do anything with the fields anyways.

c162505
  Move vtblk_enqueue_request() outside the locks when getting the ident.

c162504
  Remove soon to be uneeded trylock during dump [1].
  http://lists.freebsd.org/pipermail/freebsd-current/2011-November/029226.html

c162503
  Remove emtpy line

c162502
  Drop frame if cannot allocate a vtnet_tx_header.

  If we don't, we set OACTIVE, but if there are no
  other frames in flight, vtnet_txeof() will never
  be called to unset OACTIVE. The interface would
  have to be down/up'ed in order to become usable.

  We could be cuter here and only do this if the
  virtqueue is emtpy, but its probably not worth
  the complication.

c162501
  Start mbuf replacement loop at 1 for clarity

Obtained from:	Bryan Venteicher  bryanv at daemoninthecloset dot org
This commit is contained in:
Peter Grehan 2011-12-06 06:28:32 +00:00
parent a64788d1bc
commit 336f459c31
10 changed files with 196 additions and 79 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
sys/dev/virtio/balloon/virtio_balloon.c
View File

@ -475,7 +475,6 @@ vtballoon_update_size(struct vtballoon_softc *sc)
virtio_write_dev_config_4(sc->vtballoon_dev,
offsetof(struct virtio_balloon_config, actual),
htole32(sc->vtballoon_current_npages));
}
static int

25
sys/dev/virtio/balloon/virtio_balloon.h
View File

@ -1,7 +1,30 @@
/*
/*-
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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, 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.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 IBM OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/

29
sys/dev/virtio/block/virtio_blk.c
View File

@ -87,9 +87,7 @@ struct vtblk_softc {
struct taskqueue *vtblk_tq;
struct task vtblk_intr_task;
int vtblk_sector_size;
int vtblk_max_nsegs;
int vtblk_unit;
int vtblk_request_count;
struct vtblk_request vtblk_dump_request;
@ -185,7 +183,6 @@ TUNABLE_INT("hw.vtblk.no_ident", &vtblk_no_ident);
mtx_init(VTBLK_MTX((_sc)), (_name), \
"VTBLK Lock", MTX_DEF)
#define VTBLK_LOCK(_sc) mtx_lock(VTBLK_MTX((_sc)))
#define VTBLK_TRYLOCK(_sc) mtx_trylock(VTBLK_MTX((_sc)))
#define VTBLK_UNLOCK(_sc) mtx_unlock(VTBLK_MTX((_sc)))
#define VTBLK_LOCK_DESTROY(_sc) mtx_destroy(VTBLK_MTX((_sc)))
#define VTBLK_LOCK_ASSERT(_sc) mtx_assert(VTBLK_MTX((_sc)), MA_OWNED)
@ -281,7 +278,6 @@ vtblk_attach(device_t dev)
sc = device_get_softc(dev);
sc->vtblk_dev = dev;
sc->vtblk_unit = device_get_unit(dev);
VTBLK_LOCK_INIT(sc, device_get_nameunit(dev));
@ -299,13 +295,8 @@ vtblk_attach(device_t dev)
sc->vtblk_flags |= VTBLK_FLAG_READONLY;
/* Get local copy of config. */
if (virtio_with_feature(dev, VIRTIO_BLK_F_TOPOLOGY) == 0) {
bzero(&blkcfg, sizeof(struct virtio_blk_config));
virtio_read_device_config(dev, 0, &blkcfg,
offsetof(struct virtio_blk_config, physical_block_exp));
} else
virtio_read_device_config(dev, 0, &blkcfg,
sizeof(struct virtio_blk_config));
virtio_read_device_config(dev, 0, &blkcfg,
sizeof(struct virtio_blk_config));
/*
* With the current sglist(9) implementation, it is not easy
@ -498,12 +489,6 @@ vtblk_dump(void *arg, void *virtual, vm_offset_t physical, off_t offset,
if ((sc = dp->d_drv1) == NULL)
return (ENXIO);
if (VTBLK_TRYLOCK(sc) == 0) {
device_printf(sc->vtblk_dev,
"softc already locked, cannot dump...\n");
return (EBUSY);
}
if ((sc->vtblk_flags & VTBLK_FLAG_DUMPING) == 0) {
vtblk_prepare_dump(sc);
sc->vtblk_flags |= VTBLK_FLAG_DUMPING;
@ -622,7 +607,7 @@ vtblk_alloc_disk(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg)
dp->d_ioctl = vtblk_ioctl;
dp->d_strategy = vtblk_strategy;
dp->d_name = VTBLK_DISK_NAME;
dp->d_unit = sc->vtblk_unit;
dp->d_unit = device_get_unit(dev);
dp->d_drv1 = sc;
if ((sc->vtblk_flags & VTBLK_FLAG_READONLY) == 0)
@ -632,10 +617,9 @@ vtblk_alloc_disk(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg)
dp->d_mediasize = blkcfg->capacity * 512;
if (virtio_with_feature(dev, VIRTIO_BLK_F_BLK_SIZE))
sc->vtblk_sector_size = blkcfg->blk_size;
dp->d_sectorsize = blkcfg->blk_size;
else
sc->vtblk_sector_size = 512;
dp->d_sectorsize = sc->vtblk_sector_size;
dp->d_sectorsize = 512;
/*
* The VirtIO maximum I/O size is given in terms of segments.
@ -905,9 +889,10 @@ vtblk_get_ident(struct vtblk_softc *sc)
VTBLK_LOCK(sc);
error = vtblk_poll_request(sc, req);
vtblk_enqueue_request(sc, req);
VTBLK_UNLOCK(sc);
vtblk_enqueue_request(sc, req);
if (error) {
device_printf(sc->vtblk_dev,
"error getting device identifier: %d\n", error);

35
sys/dev/virtio/block/virtio_blk.h
View File

@ -1,7 +1,30 @@
/*
/*-
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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, 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.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 IBM OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
@ -39,16 +62,6 @@ struct virtio_blk_config {
/* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
uint32_t blk_size;
/* the next 4 entries are guarded by VIRTIO_BLK_F_TOPOLOGY */
/* exponent for physical block per logical block. */
uint8_t physical_block_exp;
/* alignment offset in logical blocks. */
uint8_t alignment_offset;
/* minimum I/O size without performance penalty in logical blocks. */
uint16_t min_io_size;
/* optimal sustained I/O size in logical blocks. */
uint32_t opt_io_size;
} __packed;
/*

75
sys/dev/virtio/network/if_vtnet.c
View File

@ -317,8 +317,20 @@ vtnet_attach(device_t dev)
if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) {
sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ;
if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX))
if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX)) {
sc->vtnet_mac_filter = malloc(
sizeof(struct vtnet_mac_filter), M_DEVBUF,
M_NOWAIT | M_ZERO);
if (sc->vtnet_mac_filter == NULL) {
device_printf(dev,
"cannot allocate mac filter table\n");
error = ENOMEM;
goto fail;
}
sc->vtnet_flags |= VTNET_FLAG_CTRL_RX;
}
if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN))
sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER;
}
@ -505,7 +517,12 @@ vtnet_detach(device_t dev)
sc->vtnet_vlan_detach = NULL;
}
if (ifp) {
if (sc->vtnet_mac_filter != NULL) {
free(sc->vtnet_mac_filter, M_DEVBUF);
sc->vtnet_mac_filter = NULL;
}
if (ifp != NULL) {
if_free(ifp);
sc->vtnet_ifp = NULL;
}
@ -742,17 +759,11 @@ vtnet_update_link_status(struct vtnet_softc *sc)
if (link && ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0)) {
sc->vtnet_flags |= VTNET_FLAG_LINK;
if (bootverbose)
device_printf(dev, "Link is up\n");
if_link_state_change(ifp, LINK_STATE_UP);
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
vtnet_start_locked(ifp);
} else if (!link && (sc->vtnet_flags & VTNET_FLAG_LINK)) {
sc->vtnet_flags &= ~VTNET_FLAG_LINK;
if (bootverbose)
device_printf(dev, "Link is down\n");
if_link_state_change(ifp, LINK_STATE_DOWN);
}
}
@ -1105,7 +1116,7 @@ vtnet_alloc_rxbuf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
("chained Rx mbuf requested without LRO_NOMRG"));
for (i = 0; i < nbufs - 1; i++) {
for (i = 1; i < nbufs; i++) {
m = m_getjcl(M_DONTWAIT, MT_DATA, 0, clsize);
if (m == NULL)
goto fail;
@ -1143,9 +1154,8 @@ vtnet_replace_rxbuf(struct vtnet_softc *sc, struct mbuf *m0, int len0)
clsize = sc->vtnet_rx_mbuf_size;
nreplace = 0;
if (m->m_next != NULL)
KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
("chained Rx mbuf without LRO_NOMRG"));
KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG ||
m->m_next == NULL, ("chained Rx mbuf without LRO_NOMRG"));
/*
* Since LRO_NOMRG mbuf chains are so large, we want to avoid
@ -1275,8 +1285,8 @@ vtnet_enqueue_rxbuf(struct vtnet_softc *sc, struct mbuf *m)
int offset, error;
VTNET_LOCK_ASSERT(sc);
if ((sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) == 0)
KASSERT(m->m_next == NULL, ("chained Rx mbuf"));
KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG ||
m->m_next == NULL, ("chained Rx mbuf without LRO_NOMRG"));
sglist_init(&sg, VTNET_MAX_RX_SEGS, segs);
@ -1688,7 +1698,8 @@ vtnet_rxeof(struct vtnet_softc *sc, int count, int *rx_npktsp)
break;
}
virtqueue_notify(vq);
if (deq > 0)
virtqueue_notify(vq);
if (rx_npktsp != NULL)
*rx_npktsp = rx_npkts;
@ -1946,9 +1957,14 @@ vtnet_encap(struct vtnet_softc *sc, struct mbuf **m_head)
struct mbuf *m;
int error;
m = *m_head;
txhdr = uma_zalloc(vtnet_tx_header_zone, M_NOWAIT | M_ZERO);
if (txhdr == NULL)
if (txhdr == NULL) {
*m_head = NULL;
m_freem(m);
return (ENOMEM);
}
/*
* Always use the non-mergeable header to simplify things. When
@ -1957,21 +1973,22 @@ vtnet_encap(struct vtnet_softc *sc, struct mbuf **m_head)
* the correct header size to the host.
*/
hdr = &txhdr->vth_uhdr.hdr;
m = *m_head;
error = ENOBUFS;
if (m->m_flags & M_VLANTAG) {
m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
if ((*m_head = m) == NULL)
if ((*m_head = m) == NULL) {
error = ENOBUFS;
goto fail;
}
m->m_flags &= ~M_VLANTAG;
}
if (m->m_pkthdr.csum_flags != 0) {
m = vtnet_tx_offload(sc, m, hdr);
if ((*m_head = m) == NULL)
if ((*m_head = m) == NULL) {
error = ENOBUFS;
goto fail;
}
}
error = vtnet_enqueue_txbuf(sc, m_head, txhdr);
@ -2387,6 +2404,7 @@ vtnet_rx_filter_mac(struct vtnet_softc *sc)
uint8_t ack;
ifp = sc->vtnet_ifp;
filter = sc->vtnet_mac_filter;
ucnt = 0;
mcnt = 0;
promisc = 0;
@ -2397,19 +2415,6 @@ vtnet_rx_filter_mac(struct vtnet_softc *sc)
KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX,
("CTRL_RX feature not negotiated"));
/*
* Allocate the MAC filtering table. Note we could do this
* at attach time, but it is probably not worth keeping it
* around for an infrequent occurrence.
*/
filter = malloc(sizeof(struct vtnet_mac_filter), M_DEVBUF,
M_NOWAIT | M_ZERO);
if (filter == NULL) {
device_printf(sc->vtnet_dev,
"cannot allocate MAC address filtering table\n");
return;
}
/* Unicast MAC addresses: */
if_addr_rlock(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
@ -2481,8 +2486,6 @@ vtnet_rx_filter_mac(struct vtnet_softc *sc)
if_printf(ifp, "error setting host MAC filter table\n");
out:
free(filter, M_DEVBUF);
if (promisc)
if (vtnet_set_promisc(sc, 1) != 0)
if_printf(ifp, "cannot enable promiscuous mode\n");

1
sys/dev/virtio/network/if_vtnetvar.h
View File

@ -99,6 +99,7 @@ struct vtnet_softc {
#define VTNET_MEDIATYPE (IFM_ETHER | IFM_1000_T | IFM_FDX)
char vtnet_hwaddr[ETHER_ADDR_LEN];
struct vtnet_mac_filter *vtnet_mac_filter;
/*
* During reset, the host's VLAN filtering table is lost. The
* array below is used to restore all the VLANs configured on

25
sys/dev/virtio/network/virtio_net.h
View File

@ -1,7 +1,30 @@
/*
/*-
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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, 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.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 IBM OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/

25
sys/dev/virtio/pci/virtio_pci.h
View File

@ -1,4 +1,4 @@
/*
/*-
* Copyright IBM Corp. 2007
*
* Authors:
@ -7,6 +7,29 @@
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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, 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.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 IBM OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/

25
sys/dev/virtio/virtio.h
View File

@ -1,7 +1,30 @@
/*
/*-
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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, 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.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 IBM OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/

34
sys/dev/virtio/virtio_ring.h
View File

@ -1,10 +1,34 @@
/*
* This header is BSD licensed so anyone can use the definitions
* to implement compatible drivers/servers.
*
/*-
* Copyright Rusty Russell IBM Corporation 2007.
*
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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, 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.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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 IBM OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
/* $FreeBSD$ */
#ifndef VIRTIO_RING_H
#define VIRTIO_RING_H