Differential D29433 Diff 86540 usr.sbin/bhyve/pci_virtio_net.c

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usr.sbin/bhyve/pci_virtio_net.c

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static void		static void
pci_vtnet_rx(struct pci_vtnet_softc *sc)		pci_vtnet_rx(struct pci_vtnet_softc *sc)
{		{
int prepend_hdr_len = sc->vhdrlen - sc->be_vhdrlen;		int prepend_hdr_len = sc->vhdrlen - sc->be_vhdrlen;
struct virtio_mrg_rxbuf_info info[VTNET_MAXSEGS];		struct virtio_mrg_rxbuf_info info[VTNET_MAXSEGS];
struct iovec iov[VTNET_MAXSEGS + 1];		struct iovec iov[VTNET_MAXSEGS + 1];
struct vqueue_info *vq;		struct vqueue_info *vq;
		struct vi_req req;

vq = &sc->vsc_queues[VTNET_RXQ];		vq = &sc->vsc_queues[VTNET_RXQ];

/* Features must be negotiated */		/* Features must be negotiated */
if (!sc->features_negotiated) {		if (!sc->features_negotiated) {
return;		return;
}		}

Show All 24 Lines	for (;;) {
* many chains as necessary in order to make room		* many chains as necessary in order to make room
* for plen bytes.		* for plen bytes.
*/		*/
riov_bytes = 0;		riov_bytes = 0;
riov_len = 0;		riov_len = 0;
riov = iov;		riov = iov;
n_chains = 0;		n_chains = 0;
do {		do {
int n = vq_getchain(vq, &info[n_chains].idx, riov,		int n = vq_getchain(vq, riov, VTNET_MAXSEGS - riov_len,
VTNET_MAXSEGS - riov_len, NULL);		&req);
		info[n_chains].idx = req.idx;

if (n == 0) {		if (n == 0) {
/*		/*
* No rx buffers. Enable RX kicks and double		* No rx buffers. Enable RX kicks and double
* check.		* check.
*/		*/
vq_kick_enable(vq);		vq_kick_enable(vq);
if (!vq_has_descs(vq)) {		if (!vq_has_descs(vq)) {
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}		}

/* TX virtqueue processing, called by the TX thread. */		/* TX virtqueue processing, called by the TX thread. */
static void		static void
pci_vtnet_proctx(struct pci_vtnet_softc sc, struct vqueue_info vq)		pci_vtnet_proctx(struct pci_vtnet_softc sc, struct vqueue_info vq)
{		{
struct iovec iov[VTNET_MAXSEGS + 1];		struct iovec iov[VTNET_MAXSEGS + 1];
struct iovec *siov = iov;		struct iovec *siov = iov;
uint16_t idx;		struct vi_req req;
ssize_t len;		ssize_t len;
int n;		int n;

/*		/*
* Obtain chain of descriptors. The first descriptor also		* Obtain chain of descriptors. The first descriptor also
* contains the virtio-net header.		* contains the virtio-net header.
*/		*/
n = vq_getchain(vq, &idx, iov, VTNET_MAXSEGS, NULL);		n = vq_getchain(vq, iov, VTNET_MAXSEGS, &req);
assert(n >= 1 && n <= VTNET_MAXSEGS);		assert(n >= 1 && n <= VTNET_MAXSEGS);

if (sc->vhdrlen != sc->be_vhdrlen) {		if (sc->vhdrlen != sc->be_vhdrlen) {
/*		/*
* The frontend uses a virtio-net header, but the backend		* The frontend uses a virtio-net header, but the backend
* does not. We simply strip the header and ignore it, as		* does not. We simply strip the header and ignore it, as
* it should be zero-filled.		* it should be zero-filled.
*/		*/
Show All 13 Lines	if (len < 0) {
len = 0;		len = 0;
}		}
}		}

/*		/*
* Return the processed chain to the guest, reporting		* Return the processed chain to the guest, reporting
* the number of bytes that we read.		* the number of bytes that we read.
*/		*/
vq_relchain(vq, idx, len);		vq_relchain(vq, req.idx, len);
}		}

/* Called on TX kick. */		/* Called on TX kick. */
static void		static void
pci_vtnet_ping_txq(void vsc, struct vqueue_info vq)		pci_vtnet_ping_txq(void vsc, struct vqueue_info vq)
{		{
struct pci_vtnet_softc *sc = vsc;		struct pci_vtnet_softc *sc = vsc;

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