Add netmap support for bhyve
Submitted by: btw MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D4826
This commit is contained in:
George V. Neville-Neil
parent
11f9ca696e
commit
b60204754b
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=293459
@ -36,6 +36,10 @@ __FBSDID("$FreeBSD$");
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#include <sys/ioctl.h>
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#include <machine/atomic.h>
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#include <net/ethernet.h>
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#ifndef NETMAP_WITH_LIBS
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#define NETMAP_WITH_LIBS
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#endif
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#include <net/netmap_user.h>
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#include <errno.h>
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#include <fcntl.h>
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@ -133,6 +137,8 @@ struct pci_vtnet_softc {
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struct mevent *vsc_mevp;
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int vsc_tapfd;
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struct nm_desc *vsc_nmd;
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int vsc_rx_ready;
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volatile int resetting; /* set and checked outside lock */
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@ -149,6 +155,10 @@ struct pci_vtnet_softc {
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pthread_mutex_t tx_mtx;
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pthread_cond_t tx_cond;
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int tx_in_progress;
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void (*pci_vtnet_rx)(struct pci_vtnet_softc *sc);
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void (*pci_vtnet_tx)(struct pci_vtnet_softc *sc, struct iovec *iov,
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int iovcnt, int len);
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};
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static void pci_vtnet_reset(void *);
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@ -371,14 +381,208 @@ pci_vtnet_tap_rx(struct pci_vtnet_softc *sc)
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vq_endchains(vq, 1);
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}
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static int
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pci_vtnet_netmap_writev(struct nm_desc *nmd, struct iovec *iov, int iovcnt)
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{
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int r, i;
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int len = 0;
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for (r = nmd->cur_tx_ring; ; ) {
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struct netmap_ring *ring = NETMAP_TXRING(nmd->nifp, r);
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uint32_t cur, idx;
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char *buf;
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if (nm_ring_empty(ring)) {
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r++;
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if (r > nmd->last_tx_ring)
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r = nmd->first_tx_ring;
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if (r == nmd->cur_rx_ring)
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break;
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continue;
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}
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cur = ring->cur;
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idx = ring->slot[cur].buf_idx;
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buf = NETMAP_BUF(ring, idx);
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for (i = 0; i < iovcnt; i++) {
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memcpy(&buf[len], iov[i].iov_base, iov[i].iov_len);
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len += iov[i].iov_len;
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}
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ring->slot[cur].len = len;
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ring->head = ring->cur = nm_ring_next(ring, cur);
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nmd->cur_tx_ring = r;
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ioctl(nmd->fd, NIOCTXSYNC, NULL);
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break;
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}
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return (len);
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}
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static inline int
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pci_vtnet_netmap_readv(struct nm_desc *nmd, struct iovec *iov, int iovcnt)
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{
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int len = 0;
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int i = 0;
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int r;
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for (r = nmd->cur_rx_ring; ; ) {
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struct netmap_ring *ring = NETMAP_RXRING(nmd->nifp, r);
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uint32_t cur, idx;
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char *buf;
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size_t left;
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if (nm_ring_empty(ring)) {
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r++;
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if (r > nmd->last_rx_ring)
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r = nmd->first_rx_ring;
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if (r == nmd->cur_rx_ring)
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break;
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continue;
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}
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cur = ring->cur;
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idx = ring->slot[cur].buf_idx;
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buf = NETMAP_BUF(ring, idx);
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left = ring->slot[cur].len;
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for (i = 0; i < iovcnt && left > 0; i++) {
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if (iov[i].iov_len > left)
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iov[i].iov_len = left;
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memcpy(iov[i].iov_base, &buf[len], iov[i].iov_len);
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len += iov[i].iov_len;
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left -= iov[i].iov_len;
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}
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ring->head = ring->cur = nm_ring_next(ring, cur);
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nmd->cur_rx_ring = r;
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ioctl(nmd->fd, NIOCRXSYNC, NULL);
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break;
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}
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for (; i < iovcnt; i++)
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iov[i].iov_len = 0;
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return (len);
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}
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/*
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* Called to send a buffer chain out to the vale port
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*/
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static void
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pci_vtnet_tap_callback(int fd, enum ev_type type, void *param)
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pci_vtnet_netmap_tx(struct pci_vtnet_softc *sc, struct iovec *iov, int iovcnt,
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int len)
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{
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static char pad[60]; /* all zero bytes */
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if (sc->vsc_nmd == NULL)
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return;
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/*
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* If the length is < 60, pad out to that and add the
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* extra zero'd segment to the iov. It is guaranteed that
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* there is always an extra iov available by the caller.
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*/
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if (len < 60) {
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iov[iovcnt].iov_base = pad;
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iov[iovcnt].iov_len = 60 - len;
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iovcnt++;
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}
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(void) pci_vtnet_netmap_writev(sc->vsc_nmd, iov, iovcnt);
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}
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static void
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pci_vtnet_netmap_rx(struct pci_vtnet_softc *sc)
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{
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struct iovec iov[VTNET_MAXSEGS], *riov;
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struct vqueue_info *vq;
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void *vrx;
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int len, n;
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uint16_t idx;
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/*
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* Should never be called without a valid netmap descriptor
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*/
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assert(sc->vsc_nmd != NULL);
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/*
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* But, will be called when the rx ring hasn't yet
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* been set up or the guest is resetting the device.
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*/
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if (!sc->vsc_rx_ready || sc->resetting) {
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/*
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* Drop the packet and try later.
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*/
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(void) nm_nextpkt(sc->vsc_nmd, (void *)dummybuf);
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return;
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}
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/*
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* Check for available rx buffers
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*/
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vq = &sc->vsc_queues[VTNET_RXQ];
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if (!vq_has_descs(vq)) {
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/*
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* Drop the packet and try later. Interrupt on
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* empty, if that's negotiated.
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*/
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(void) nm_nextpkt(sc->vsc_nmd, (void *)dummybuf);
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vq_endchains(vq, 1);
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return;
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}
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do {
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/*
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* Get descriptor chain.
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*/
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n = vq_getchain(vq, &idx, iov, VTNET_MAXSEGS, NULL);
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assert(n >= 1 && n <= VTNET_MAXSEGS);
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/*
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* Get a pointer to the rx header, and use the
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* data immediately following it for the packet buffer.
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*/
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vrx = iov[0].iov_base;
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riov = rx_iov_trim(iov, &n, sc->rx_vhdrlen);
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len = pci_vtnet_netmap_readv(sc->vsc_nmd, riov, n);
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if (len == 0) {
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/*
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* No more packets, but still some avail ring
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* entries. Interrupt if needed/appropriate.
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*/
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vq_endchains(vq, 0);
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return;
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}
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/*
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* The only valid field in the rx packet header is the
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* number of buffers if merged rx bufs were negotiated.
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*/
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memset(vrx, 0, sc->rx_vhdrlen);
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if (sc->rx_merge) {
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struct virtio_net_rxhdr *vrxh;
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vrxh = vrx;
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vrxh->vrh_bufs = 1;
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}
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/*
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* Release this chain and handle more chains.
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*/
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vq_relchain(vq, idx, len + sc->rx_vhdrlen);
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} while (vq_has_descs(vq));
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/* Interrupt if needed, including for NOTIFY_ON_EMPTY. */
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vq_endchains(vq, 1);
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}
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static void
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pci_vtnet_rx_callback(int fd, enum ev_type type, void *param)
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{
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struct pci_vtnet_softc *sc = param;
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pthread_mutex_lock(&sc->rx_mtx);
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sc->rx_in_progress = 1;
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pci_vtnet_tap_rx(sc);
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sc->pci_vtnet_rx(sc);
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sc->rx_in_progress = 0;
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pthread_mutex_unlock(&sc->rx_mtx);
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@ -421,7 +625,7 @@ pci_vtnet_proctx(struct pci_vtnet_softc *sc, struct vqueue_info *vq)
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}
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DPRINTF(("virtio: packet send, %d bytes, %d segs\n\r", plen, n));
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pci_vtnet_tap_tx(sc, &iov[1], n - 1, plen);
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sc->pci_vtnet_tx(sc, &iov[1], n - 1, plen);
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/* chain is processed, release it and set tlen */
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vq_relchain(vq, idx, tlen);
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@ -532,6 +736,67 @@ pci_vtnet_parsemac(char *mac_str, uint8_t *mac_addr)
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return (0);
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}
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static void
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pci_vtnet_tap_setup(struct pci_vtnet_softc *sc, char *devname)
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{
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char tbuf[80];
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strcpy(tbuf, "/dev/");
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strlcat(tbuf, devname, sizeof(tbuf));
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sc->pci_vtnet_rx = pci_vtnet_tap_rx;
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sc->pci_vtnet_tx = pci_vtnet_tap_tx;
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sc->vsc_tapfd = open(tbuf, O_RDWR);
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if (sc->vsc_tapfd == -1) {
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WPRINTF(("open of tap device %s failed\n", tbuf));
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return;
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}
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/*
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* Set non-blocking and register for read
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* notifications with the event loop
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*/
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int opt = 1;
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if (ioctl(sc->vsc_tapfd, FIONBIO, &opt) < 0) {
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WPRINTF(("tap device O_NONBLOCK failed\n"));
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close(sc->vsc_tapfd);
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sc->vsc_tapfd = -1;
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}
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sc->vsc_mevp = mevent_add(sc->vsc_tapfd,
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EVF_READ,
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pci_vtnet_rx_callback,
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sc);
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if (sc->vsc_mevp == NULL) {
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WPRINTF(("Could not register event\n"));
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close(sc->vsc_tapfd);
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sc->vsc_tapfd = -1;
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}
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}
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static void
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pci_vtnet_netmap_setup(struct pci_vtnet_softc *sc, char *ifname)
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{
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sc->pci_vtnet_rx = pci_vtnet_netmap_rx;
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sc->pci_vtnet_tx = pci_vtnet_netmap_tx;
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sc->vsc_nmd = nm_open(ifname, NULL, 0, 0);
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if (sc->vsc_nmd == NULL) {
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WPRINTF(("open of netmap device %s failed\n", ifname));
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return;
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}
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sc->vsc_mevp = mevent_add(sc->vsc_nmd->fd,
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EVF_READ,
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pci_vtnet_rx_callback,
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sc);
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if (sc->vsc_mevp == NULL) {
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WPRINTF(("Could not register event\n"));
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nm_close(sc->vsc_nmd);
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sc->vsc_nmd = NULL;
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}
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}
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static int
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pci_vtnet_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
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@ -567,8 +832,8 @@ pci_vtnet_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
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*/
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mac_provided = 0;
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sc->vsc_tapfd = -1;
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sc->vsc_nmd = NULL;
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if (opts != NULL) {
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char tbuf[80];
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int err;
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devname = vtopts = strdup(opts);
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@ -583,36 +848,12 @@ pci_vtnet_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
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mac_provided = 1;
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}
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strcpy(tbuf, "/dev/");
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strlcat(tbuf, devname, sizeof(tbuf));
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if (strncmp(devname, "vale", 4) == 0)
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pci_vtnet_netmap_setup(sc, devname);
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if (strncmp(devname, "tap", 3) == 0)
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pci_vtnet_tap_setup(sc, devname);
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free(devname);
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sc->vsc_tapfd = open(tbuf, O_RDWR);
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if (sc->vsc_tapfd == -1) {
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WPRINTF(("open of tap device %s failed\n", tbuf));
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} else {
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/*
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* Set non-blocking and register for read
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* notifications with the event loop
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*/
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int opt = 1;
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if (ioctl(sc->vsc_tapfd, FIONBIO, &opt) < 0) {
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WPRINTF(("tap device O_NONBLOCK failed\n"));
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close(sc->vsc_tapfd);
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sc->vsc_tapfd = -1;
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}
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sc->vsc_mevp = mevent_add(sc->vsc_tapfd,
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EVF_READ,
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pci_vtnet_tap_callback,
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sc);
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if (sc->vsc_mevp == NULL) {
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WPRINTF(("Could not register event\n"));
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close(sc->vsc_tapfd);
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sc->vsc_tapfd = -1;
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}
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}
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}
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/*
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