freebsd-nq/usr.sbin/bhyve/virtio.c
Pedro F. Giffuni 1de7b4b805 various: general adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00

780 lines
21 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2013 Chris Torek <torek @ torek net>
* 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, 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 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 THE AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/uio.h>
#include <stdio.h>
#include <stdint.h>
#include <pthread.h>
#include <pthread_np.h>
#include "bhyverun.h"
#include "pci_emul.h"
#include "virtio.h"
/*
* Functions for dealing with generalized "virtual devices" as
* defined by <https://www.google.com/#output=search&q=virtio+spec>
*/
/*
* In case we decide to relax the "virtio softc comes at the
* front of virtio-based device softc" constraint, let's use
* this to convert.
*/
#define DEV_SOFTC(vs) ((void *)(vs))
/*
* Link a virtio_softc to its constants, the device softc, and
* the PCI emulation.
*/
void
vi_softc_linkup(struct virtio_softc *vs, struct virtio_consts *vc,
void *dev_softc, struct pci_devinst *pi,
struct vqueue_info *queues)
{
int i;
/* vs and dev_softc addresses must match */
assert((void *)vs == dev_softc);
vs->vs_vc = vc;
vs->vs_pi = pi;
pi->pi_arg = vs;
vs->vs_queues = queues;
for (i = 0; i < vc->vc_nvq; i++) {
queues[i].vq_vs = vs;
queues[i].vq_num = i;
}
}
/*
* Reset device (device-wide). This erases all queues, i.e.,
* all the queues become invalid (though we don't wipe out the
* internal pointers, we just clear the VQ_ALLOC flag).
*
* It resets negotiated features to "none".
*
* If MSI-X is enabled, this also resets all the vectors to NO_VECTOR.
*/
void
vi_reset_dev(struct virtio_softc *vs)
{
struct vqueue_info *vq;
int i, nvq;
if (vs->vs_mtx)
assert(pthread_mutex_isowned_np(vs->vs_mtx));
nvq = vs->vs_vc->vc_nvq;
for (vq = vs->vs_queues, i = 0; i < nvq; vq++, i++) {
vq->vq_flags = 0;
vq->vq_last_avail = 0;
vq->vq_save_used = 0;
vq->vq_pfn = 0;
vq->vq_msix_idx = VIRTIO_MSI_NO_VECTOR;
}
vs->vs_negotiated_caps = 0;
vs->vs_curq = 0;
/* vs->vs_status = 0; -- redundant */
if (vs->vs_isr)
pci_lintr_deassert(vs->vs_pi);
vs->vs_isr = 0;
vs->vs_msix_cfg_idx = VIRTIO_MSI_NO_VECTOR;
}
/*
* Set I/O BAR (usually 0) to map PCI config registers.
*/
void
vi_set_io_bar(struct virtio_softc *vs, int barnum)
{
size_t size;
/*
* ??? should we use CFG0 if MSI-X is disabled?
* Existing code did not...
*/
size = VTCFG_R_CFG1 + vs->vs_vc->vc_cfgsize;
pci_emul_alloc_bar(vs->vs_pi, barnum, PCIBAR_IO, size);
}
/*
* Initialize MSI-X vector capabilities if we're to use MSI-X,
* or MSI capabilities if not.
*
* We assume we want one MSI-X vector per queue, here, plus one
* for the config vec.
*/
int
vi_intr_init(struct virtio_softc *vs, int barnum, int use_msix)
{
int nvec;
if (use_msix) {
vs->vs_flags |= VIRTIO_USE_MSIX;
VS_LOCK(vs);
vi_reset_dev(vs); /* set all vectors to NO_VECTOR */
VS_UNLOCK(vs);
nvec = vs->vs_vc->vc_nvq + 1;
if (pci_emul_add_msixcap(vs->vs_pi, nvec, barnum))
return (1);
} else
vs->vs_flags &= ~VIRTIO_USE_MSIX;
/* Only 1 MSI vector for bhyve */
pci_emul_add_msicap(vs->vs_pi, 1);
/* Legacy interrupts are mandatory for virtio devices */
pci_lintr_request(vs->vs_pi);
return (0);
}
/*
* Initialize the currently-selected virtio queue (vs->vs_curq).
* The guest just gave us a page frame number, from which we can
* calculate the addresses of the queue.
*/
void
vi_vq_init(struct virtio_softc *vs, uint32_t pfn)
{
struct vqueue_info *vq;
uint64_t phys;
size_t size;
char *base;
vq = &vs->vs_queues[vs->vs_curq];
vq->vq_pfn = pfn;
phys = (uint64_t)pfn << VRING_PFN;
size = vring_size(vq->vq_qsize);
base = paddr_guest2host(vs->vs_pi->pi_vmctx, phys, size);
/* First page(s) are descriptors... */
vq->vq_desc = (struct virtio_desc *)base;
base += vq->vq_qsize * sizeof(struct virtio_desc);
/* ... immediately followed by "avail" ring (entirely uint16_t's) */
vq->vq_avail = (struct vring_avail *)base;
base += (2 + vq->vq_qsize + 1) * sizeof(uint16_t);
/* Then it's rounded up to the next page... */
base = (char *)roundup2((uintptr_t)base, VRING_ALIGN);
/* ... and the last page(s) are the used ring. */
vq->vq_used = (struct vring_used *)base;
/* Mark queue as allocated, and start at 0 when we use it. */
vq->vq_flags = VQ_ALLOC;
vq->vq_last_avail = 0;
vq->vq_save_used = 0;
}
/*
* Helper inline for vq_getchain(): record the i'th "real"
* descriptor.
*/
static inline void
_vq_record(int i, volatile struct virtio_desc *vd, struct vmctx *ctx,
struct iovec *iov, int n_iov, uint16_t *flags) {
if (i >= n_iov)
return;
iov[i].iov_base = paddr_guest2host(ctx, vd->vd_addr, vd->vd_len);
iov[i].iov_len = vd->vd_len;
if (flags != NULL)
flags[i] = vd->vd_flags;
}
#define VQ_MAX_DESCRIPTORS 512 /* see below */
/*
* Examine the chain of descriptors starting at the "next one" to
* make sure that they describe a sensible request. If so, return
* the number of "real" descriptors that would be needed/used in
* acting on this request. This may be smaller than the number of
* available descriptors, e.g., if there are two available but
* they are two separate requests, this just returns 1. Or, it
* may be larger: if there are indirect descriptors involved,
* there may only be one descriptor available but it may be an
* indirect pointing to eight more. We return 8 in this case,
* i.e., we do not count the indirect descriptors, only the "real"
* ones.
*
* Basically, this vets the vd_flags and vd_next field of each
* descriptor and tells you how many are involved. Since some may
* be indirect, this also needs the vmctx (in the pci_devinst
* at vs->vs_pi) so that it can find indirect descriptors.
*
* As we process each descriptor, we copy and adjust it (guest to
* host address wise, also using the vmtctx) into the given iov[]
* array (of the given size). If the array overflows, we stop
* placing values into the array but keep processing descriptors,
* up to VQ_MAX_DESCRIPTORS, before giving up and returning -1.
* So you, the caller, must not assume that iov[] is as big as the
* return value (you can process the same thing twice to allocate
* a larger iov array if needed, or supply a zero length to find
* out how much space is needed).
*
* If you want to verify the WRITE flag on each descriptor, pass a
* non-NULL "flags" pointer to an array of "uint16_t" of the same size
* as n_iov and we'll copy each vd_flags field after unwinding any
* indirects.
*
* If some descriptor(s) are invalid, this prints a diagnostic message
* and returns -1. If no descriptors are ready now it simply returns 0.
*
* You are assumed to have done a vq_ring_ready() if needed (note
* that vq_has_descs() does one).
*/
int
vq_getchain(struct vqueue_info *vq, uint16_t *pidx,
struct iovec *iov, int n_iov, uint16_t *flags)
{
int i;
u_int ndesc, n_indir;
u_int idx, next;
volatile struct virtio_desc *vdir, *vindir, *vp;
struct vmctx *ctx;
struct virtio_softc *vs;
const char *name;
vs = vq->vq_vs;
name = vs->vs_vc->vc_name;
/*
* Note: it's the responsibility of the guest not to
* update vq->vq_avail->va_idx until all of the descriptors
* the guest has written are valid (including all their
* vd_next fields and vd_flags).
*
* Compute (last_avail - va_idx) in integers mod 2**16. This is
* the number of descriptors the device has made available
* since the last time we updated vq->vq_last_avail.
*
* We just need to do the subtraction as an unsigned int,
* then trim off excess bits.
*/
idx = vq->vq_last_avail;
ndesc = (uint16_t)((u_int)vq->vq_avail->va_idx - idx);
if (ndesc == 0)
return (0);
if (ndesc > vq->vq_qsize) {
/* XXX need better way to diagnose issues */
fprintf(stderr,
"%s: ndesc (%u) out of range, driver confused?\r\n",
name, (u_int)ndesc);
return (-1);
}
/*
* Now count/parse "involved" descriptors starting from
* the head of the chain.
*
* To prevent loops, we could be more complicated and
* check whether we're re-visiting a previously visited
* index, but we just abort if the count gets excessive.
*/
ctx = vs->vs_pi->pi_vmctx;
*pidx = next = vq->vq_avail->va_ring[idx & (vq->vq_qsize - 1)];
vq->vq_last_avail++;
for (i = 0; i < VQ_MAX_DESCRIPTORS; next = vdir->vd_next) {
if (next >= vq->vq_qsize) {
fprintf(stderr,
"%s: descriptor index %u out of range, "
"driver confused?\r\n",
name, next);
return (-1);
}
vdir = &vq->vq_desc[next];
if ((vdir->vd_flags & VRING_DESC_F_INDIRECT) == 0) {
_vq_record(i, vdir, ctx, iov, n_iov, flags);
i++;
} else if ((vs->vs_vc->vc_hv_caps &
VIRTIO_RING_F_INDIRECT_DESC) == 0) {
fprintf(stderr,
"%s: descriptor has forbidden INDIRECT flag, "
"driver confused?\r\n",
name);
return (-1);
} else {
n_indir = vdir->vd_len / 16;
if ((vdir->vd_len & 0xf) || n_indir == 0) {
fprintf(stderr,
"%s: invalid indir len 0x%x, "
"driver confused?\r\n",
name, (u_int)vdir->vd_len);
return (-1);
}
vindir = paddr_guest2host(ctx,
vdir->vd_addr, vdir->vd_len);
/*
* Indirects start at the 0th, then follow
* their own embedded "next"s until those run
* out. Each one's indirect flag must be off
* (we don't really have to check, could just
* ignore errors...).
*/
next = 0;
for (;;) {
vp = &vindir[next];
if (vp->vd_flags & VRING_DESC_F_INDIRECT) {
fprintf(stderr,
"%s: indirect desc has INDIR flag,"
" driver confused?\r\n",
name);
return (-1);
}
_vq_record(i, vp, ctx, iov, n_iov, flags);
if (++i > VQ_MAX_DESCRIPTORS)
goto loopy;
if ((vp->vd_flags & VRING_DESC_F_NEXT) == 0)
break;
next = vp->vd_next;
if (next >= n_indir) {
fprintf(stderr,
"%s: invalid next %u > %u, "
"driver confused?\r\n",
name, (u_int)next, n_indir);
return (-1);
}
}
}
if ((vdir->vd_flags & VRING_DESC_F_NEXT) == 0)
return (i);
}
loopy:
fprintf(stderr,
"%s: descriptor loop? count > %d - driver confused?\r\n",
name, i);
return (-1);
}
/*
* Return the currently-first request chain back to the available queue.
*
* (This chain is the one you handled when you called vq_getchain()
* and used its positive return value.)
*/
void
vq_retchain(struct vqueue_info *vq)
{
vq->vq_last_avail--;
}
/*
* Return specified request chain to the guest, setting its I/O length
* to the provided value.
*
* (This chain is the one you handled when you called vq_getchain()
* and used its positive return value.)
*/
void
vq_relchain(struct vqueue_info *vq, uint16_t idx, uint32_t iolen)
{
uint16_t uidx, mask;
volatile struct vring_used *vuh;
volatile struct virtio_used *vue;
/*
* Notes:
* - mask is N-1 where N is a power of 2 so computes x % N
* - vuh points to the "used" data shared with guest
* - vue points to the "used" ring entry we want to update
* - head is the same value we compute in vq_iovecs().
*
* (I apologize for the two fields named vu_idx; the
* virtio spec calls the one that vue points to, "id"...)
*/
mask = vq->vq_qsize - 1;
vuh = vq->vq_used;
uidx = vuh->vu_idx;
vue = &vuh->vu_ring[uidx++ & mask];
vue->vu_idx = idx;
vue->vu_tlen = iolen;
vuh->vu_idx = uidx;
}
/*
* Driver has finished processing "available" chains and calling
* vq_relchain on each one. If driver used all the available
* chains, used_all should be set.
*
* If the "used" index moved we may need to inform the guest, i.e.,
* deliver an interrupt. Even if the used index did NOT move we
* may need to deliver an interrupt, if the avail ring is empty and
* we are supposed to interrupt on empty.
*
* Note that used_all_avail is provided by the caller because it's
* a snapshot of the ring state when he decided to finish interrupt
* processing -- it's possible that descriptors became available after
* that point. (It's also typically a constant 1/True as well.)
*/
void
vq_endchains(struct vqueue_info *vq, int used_all_avail)
{
struct virtio_softc *vs;
uint16_t event_idx, new_idx, old_idx;
int intr;
/*
* Interrupt generation: if we're using EVENT_IDX,
* interrupt if we've crossed the event threshold.
* Otherwise interrupt is generated if we added "used" entries,
* but suppressed by VRING_AVAIL_F_NO_INTERRUPT.
*
* In any case, though, if NOTIFY_ON_EMPTY is set and the
* entire avail was processed, we need to interrupt always.
*/
vs = vq->vq_vs;
old_idx = vq->vq_save_used;
vq->vq_save_used = new_idx = vq->vq_used->vu_idx;
if (used_all_avail &&
(vs->vs_negotiated_caps & VIRTIO_F_NOTIFY_ON_EMPTY))
intr = 1;
else if (vs->vs_negotiated_caps & VIRTIO_RING_F_EVENT_IDX) {
event_idx = VQ_USED_EVENT_IDX(vq);
/*
* This calculation is per docs and the kernel
* (see src/sys/dev/virtio/virtio_ring.h).
*/
intr = (uint16_t)(new_idx - event_idx - 1) <
(uint16_t)(new_idx - old_idx);
} else {
intr = new_idx != old_idx &&
!(vq->vq_avail->va_flags & VRING_AVAIL_F_NO_INTERRUPT);
}
if (intr)
vq_interrupt(vs, vq);
}
/* Note: these are in sorted order to make for a fast search */
static struct config_reg {
uint16_t cr_offset; /* register offset */
uint8_t cr_size; /* size (bytes) */
uint8_t cr_ro; /* true => reg is read only */
const char *cr_name; /* name of reg */
} config_regs[] = {
{ VTCFG_R_HOSTCAP, 4, 1, "HOSTCAP" },
{ VTCFG_R_GUESTCAP, 4, 0, "GUESTCAP" },
{ VTCFG_R_PFN, 4, 0, "PFN" },
{ VTCFG_R_QNUM, 2, 1, "QNUM" },
{ VTCFG_R_QSEL, 2, 0, "QSEL" },
{ VTCFG_R_QNOTIFY, 2, 0, "QNOTIFY" },
{ VTCFG_R_STATUS, 1, 0, "STATUS" },
{ VTCFG_R_ISR, 1, 0, "ISR" },
{ VTCFG_R_CFGVEC, 2, 0, "CFGVEC" },
{ VTCFG_R_QVEC, 2, 0, "QVEC" },
};
static inline struct config_reg *
vi_find_cr(int offset) {
u_int hi, lo, mid;
struct config_reg *cr;
lo = 0;
hi = sizeof(config_regs) / sizeof(*config_regs) - 1;
while (hi >= lo) {
mid = (hi + lo) >> 1;
cr = &config_regs[mid];
if (cr->cr_offset == offset)
return (cr);
if (cr->cr_offset < offset)
lo = mid + 1;
else
hi = mid - 1;
}
return (NULL);
}
/*
* Handle pci config space reads.
* If it's to the MSI-X info, do that.
* If it's part of the virtio standard stuff, do that.
* Otherwise dispatch to the actual driver.
*/
uint64_t
vi_pci_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
int baridx, uint64_t offset, int size)
{
struct virtio_softc *vs = pi->pi_arg;
struct virtio_consts *vc;
struct config_reg *cr;
uint64_t virtio_config_size, max;
const char *name;
uint32_t newoff;
uint32_t value;
int error;
if (vs->vs_flags & VIRTIO_USE_MSIX) {
if (baridx == pci_msix_table_bar(pi) ||
baridx == pci_msix_pba_bar(pi)) {
return (pci_emul_msix_tread(pi, offset, size));
}
}
/* XXX probably should do something better than just assert() */
assert(baridx == 0);
if (vs->vs_mtx)
pthread_mutex_lock(vs->vs_mtx);
vc = vs->vs_vc;
name = vc->vc_name;
value = size == 1 ? 0xff : size == 2 ? 0xffff : 0xffffffff;
if (size != 1 && size != 2 && size != 4)
goto bad;
if (pci_msix_enabled(pi))
virtio_config_size = VTCFG_R_CFG1;
else
virtio_config_size = VTCFG_R_CFG0;
if (offset >= virtio_config_size) {
/*
* Subtract off the standard size (including MSI-X
* registers if enabled) and dispatch to underlying driver.
* If that fails, fall into general code.
*/
newoff = offset - virtio_config_size;
max = vc->vc_cfgsize ? vc->vc_cfgsize : 0x100000000;
if (newoff + size > max)
goto bad;
error = (*vc->vc_cfgread)(DEV_SOFTC(vs), newoff, size, &value);
if (!error)
goto done;
}
bad:
cr = vi_find_cr(offset);
if (cr == NULL || cr->cr_size != size) {
if (cr != NULL) {
/* offset must be OK, so size must be bad */
fprintf(stderr,
"%s: read from %s: bad size %d\r\n",
name, cr->cr_name, size);
} else {
fprintf(stderr,
"%s: read from bad offset/size %jd/%d\r\n",
name, (uintmax_t)offset, size);
}
goto done;
}
switch (offset) {
case VTCFG_R_HOSTCAP:
value = vc->vc_hv_caps;
break;
case VTCFG_R_GUESTCAP:
value = vs->vs_negotiated_caps;
break;
case VTCFG_R_PFN:
if (vs->vs_curq < vc->vc_nvq)
value = vs->vs_queues[vs->vs_curq].vq_pfn;
break;
case VTCFG_R_QNUM:
value = vs->vs_curq < vc->vc_nvq ?
vs->vs_queues[vs->vs_curq].vq_qsize : 0;
break;
case VTCFG_R_QSEL:
value = vs->vs_curq;
break;
case VTCFG_R_QNOTIFY:
value = 0; /* XXX */
break;
case VTCFG_R_STATUS:
value = vs->vs_status;
break;
case VTCFG_R_ISR:
value = vs->vs_isr;
vs->vs_isr = 0; /* a read clears this flag */
if (value)
pci_lintr_deassert(pi);
break;
case VTCFG_R_CFGVEC:
value = vs->vs_msix_cfg_idx;
break;
case VTCFG_R_QVEC:
value = vs->vs_curq < vc->vc_nvq ?
vs->vs_queues[vs->vs_curq].vq_msix_idx :
VIRTIO_MSI_NO_VECTOR;
break;
}
done:
if (vs->vs_mtx)
pthread_mutex_unlock(vs->vs_mtx);
return (value);
}
/*
* Handle pci config space writes.
* If it's to the MSI-X info, do that.
* If it's part of the virtio standard stuff, do that.
* Otherwise dispatch to the actual driver.
*/
void
vi_pci_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
int baridx, uint64_t offset, int size, uint64_t value)
{
struct virtio_softc *vs = pi->pi_arg;
struct vqueue_info *vq;
struct virtio_consts *vc;
struct config_reg *cr;
uint64_t virtio_config_size, max;
const char *name;
uint32_t newoff;
int error;
if (vs->vs_flags & VIRTIO_USE_MSIX) {
if (baridx == pci_msix_table_bar(pi) ||
baridx == pci_msix_pba_bar(pi)) {
pci_emul_msix_twrite(pi, offset, size, value);
return;
}
}
/* XXX probably should do something better than just assert() */
assert(baridx == 0);
if (vs->vs_mtx)
pthread_mutex_lock(vs->vs_mtx);
vc = vs->vs_vc;
name = vc->vc_name;
if (size != 1 && size != 2 && size != 4)
goto bad;
if (pci_msix_enabled(pi))
virtio_config_size = VTCFG_R_CFG1;
else
virtio_config_size = VTCFG_R_CFG0;
if (offset >= virtio_config_size) {
/*
* Subtract off the standard size (including MSI-X
* registers if enabled) and dispatch to underlying driver.
*/
newoff = offset - virtio_config_size;
max = vc->vc_cfgsize ? vc->vc_cfgsize : 0x100000000;
if (newoff + size > max)
goto bad;
error = (*vc->vc_cfgwrite)(DEV_SOFTC(vs), newoff, size, value);
if (!error)
goto done;
}
bad:
cr = vi_find_cr(offset);
if (cr == NULL || cr->cr_size != size || cr->cr_ro) {
if (cr != NULL) {
/* offset must be OK, wrong size and/or reg is R/O */
if (cr->cr_size != size)
fprintf(stderr,
"%s: write to %s: bad size %d\r\n",
name, cr->cr_name, size);
if (cr->cr_ro)
fprintf(stderr,
"%s: write to read-only reg %s\r\n",
name, cr->cr_name);
} else {
fprintf(stderr,
"%s: write to bad offset/size %jd/%d\r\n",
name, (uintmax_t)offset, size);
}
goto done;
}
switch (offset) {
case VTCFG_R_GUESTCAP:
vs->vs_negotiated_caps = value & vc->vc_hv_caps;
if (vc->vc_apply_features)
(*vc->vc_apply_features)(DEV_SOFTC(vs),
vs->vs_negotiated_caps);
break;
case VTCFG_R_PFN:
if (vs->vs_curq >= vc->vc_nvq)
goto bad_qindex;
vi_vq_init(vs, value);
break;
case VTCFG_R_QSEL:
/*
* Note that the guest is allowed to select an
* invalid queue; we just need to return a QNUM
* of 0 while the bad queue is selected.
*/
vs->vs_curq = value;
break;
case VTCFG_R_QNOTIFY:
if (value >= vc->vc_nvq) {
fprintf(stderr, "%s: queue %d notify out of range\r\n",
name, (int)value);
goto done;
}
vq = &vs->vs_queues[value];
if (vq->vq_notify)
(*vq->vq_notify)(DEV_SOFTC(vs), vq);
else if (vc->vc_qnotify)
(*vc->vc_qnotify)(DEV_SOFTC(vs), vq);
else
fprintf(stderr,
"%s: qnotify queue %d: missing vq/vc notify\r\n",
name, (int)value);
break;
case VTCFG_R_STATUS:
vs->vs_status = value;
if (value == 0)
(*vc->vc_reset)(DEV_SOFTC(vs));
break;
case VTCFG_R_CFGVEC:
vs->vs_msix_cfg_idx = value;
break;
case VTCFG_R_QVEC:
if (vs->vs_curq >= vc->vc_nvq)
goto bad_qindex;
vq = &vs->vs_queues[vs->vs_curq];
vq->vq_msix_idx = value;
break;
}
goto done;
bad_qindex:
fprintf(stderr,
"%s: write config reg %s: curq %d >= max %d\r\n",
name, cr->cr_name, vs->vs_curq, vc->vc_nvq);
done:
if (vs->vs_mtx)
pthread_mutex_unlock(vs->vs_mtx);
}