diff options
Diffstat (limited to 'usr.sbin/bhyve/virtio.c')
| -rw-r--r-- | usr.sbin/bhyve/virtio.c | 745 |
1 files changed, 745 insertions, 0 deletions
diff --git a/usr.sbin/bhyve/virtio.c b/usr.sbin/bhyve/virtio.c new file mode 100644 index 0000000..cdc9228 --- /dev/null +++ b/usr.sbin/bhyve/virtio.c @@ -0,0 +1,745 @@ +/*- + * 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 "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; + + 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_pfn = 0; + vq->vq_msix_idx = VIRTIO_MSI_NO_VECTOR; + } + vs->vs_negotiated_caps = 0; + vs->vs_curq = 0; + /* vs->vs_status = 0; -- redundant */ + 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; + vi_reset_dev(vs); /* set all vectors to NO_VECTOR */ + 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; + pci_emul_add_msicap(vs->vs_pi, barnum); + } + 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 = 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; +} + +/* + * 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, + struct iovec *iov, int n_iov, uint16_t *flags) +{ + int i; + u_int ndesc, n_indir; + u_int idx, head, 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; + head = vq->vq_avail->va_ring[idx & (vq->vq_qsize - 1)]; + next = head; + 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_negotiated_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 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, uint32_t iolen) +{ + uint16_t head, 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; + head = vq->vq_avail->va_ring[vq->vq_last_avail++ & mask]; + + uidx = vuh->vu_idx; + vue = &vuh->vu_ring[uidx++ & mask]; + vue->vu_idx = head; /* ie, vue->id = head */ + 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; + new_idx = vq->vq_used->vu_idx; + old_idx = vq->vq_save_used; + if (used_all_avail && + (vs->vs_negotiated_caps & VIRTIO_F_NOTIFY_ON_EMPTY)) + intr = 1; + else if (vs->vs_flags & VIRTIO_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 */ + 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; + 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); +} |
