static int connect_rings(struct backend_info *be)
{
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
unsigned long tx_ring_ref, rx_ring_ref;
unsigned int evtchn, rx_copy;
int err;
int val;
err = xenbus_gather(XBT_NIL, dev->otherend,
"tx-ring-ref", "%lu", &tx_ring_ref,
"rx-ring-ref", "%lu", &rx_ring_ref,
"event-channel", "%u", &evtchn, NULL);
if (err) {
xenbus_dev_fatal(dev, err,
"reading %s/ring-ref and event-channel",
dev->otherend);
return err;
}
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
err = 0;
rx_copy = 0;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
dev->otherend);
return err;
}
if (!rx_copy)
return -EOPNOTSUPP;
if (vif->dev->tx_queue_len != 0) {
if (xenbus_scanf(XBT_NIL, dev->otherend,
"feature-rx-notify", "%d", &val) < 0)
val = 0;
if (val)
vif->can_queue = 1;
else
/* Must be non-zero for pfifo_fast to work. */
vif->dev->tx_queue_len = 1;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
"%d", &val) < 0)
val = 0;
vif->can_sg = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
"%d", &val) < 0)
val = 0;
vif->gso = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix",
"%d", &val) < 0)
val = 0;
vif->gso_prefix = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
"%d", &val) < 0)
val = 0;
vif->csum = !val;
/* Map the shared frame, irq etc. */
err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref, evtchn);
if (err) {
xenbus_dev_fatal(dev, err,
"mapping shared-frames %lu/%lu port %u",
tx_ring_ref, rx_ring_ref, evtchn);
return err;
}
return 0;
}
static int connect_rings(struct backend_info *be)
{
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
unsigned long tx_ring_ref, rx_ring_ref;
unsigned int tx_evtchn, rx_evtchn, rx_copy;
int err;
int val;
err = xenbus_gather(XBT_NIL, dev->otherend,
"tx-ring-ref", "%lu", &tx_ring_ref,
"rx-ring-ref", "%lu", &rx_ring_ref, NULL);
if (err) {
xenbus_dev_fatal(dev, err,
"reading %s/ring-ref",
dev->otherend);
return err;
}
/* Try split event channels first, then single event channel. */
err = xenbus_gather(XBT_NIL, dev->otherend,
"event-channel-tx", "%u", &tx_evtchn,
"event-channel-rx", "%u", &rx_evtchn, NULL);
if (err < 0) {
err = xenbus_scanf(XBT_NIL, dev->otherend,
"event-channel", "%u", &tx_evtchn);
if (err < 0) {
xenbus_dev_fatal(dev, err,
"reading %s/event-channel(-tx/rx)",
dev->otherend);
return err;
}
rx_evtchn = tx_evtchn;
}
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
err = 0;
rx_copy = 0;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
dev->otherend);
return err;
}
if (!rx_copy)
return -EOPNOTSUPP;
if (vif->dev->tx_queue_len != 0) {
if (xenbus_scanf(XBT_NIL, dev->otherend,
"feature-rx-notify", "%d", &val) < 0)
val = 0;
if (val)
vif->can_queue = 1;
else
/* Must be non-zero for pfifo_fast to work. */
vif->dev->tx_queue_len = 1;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
"%d", &val) < 0)
val = 0;
vif->can_sg = !!val;
vif->gso_mask = 0;
vif->gso_prefix_mask = 0;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_mask |= GSO_BIT(TCPV4);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_prefix_mask |= GSO_BIT(TCPV4);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_mask |= GSO_BIT(TCPV6);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6-prefix",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_prefix_mask |= GSO_BIT(TCPV6);
if (vif->gso_mask & vif->gso_prefix_mask) {
xenbus_dev_fatal(dev, err,
"%s: gso and gso prefix flags are not "
"mutually exclusive",
dev->otherend);
return -EOPNOTSUPP;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
"%d", &val) < 0)
val = 0;
vif->ip_csum = !val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload",
"%d", &val) < 0)
val = 0;
vif->ipv6_csum = !!val;
/* Map the shared frame, irq etc. */
err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref,
tx_evtchn, rx_evtchn);
if (err) {
xenbus_dev_fatal(dev, err,
"mapping shared-frames %lu/%lu port tx %u rx %u",
tx_ring_ref, rx_ring_ref,
tx_evtchn, rx_evtchn);
return err;
}
return 0;
}
static int connect_rings(struct backend_info *be, struct xenvif_queue *queue)
{
struct xenbus_device *dev = be->dev;
unsigned int num_queues = queue->vif->num_queues;
unsigned long tx_ring_ref, rx_ring_ref;
unsigned int tx_evtchn, rx_evtchn;
int err;
char *xspath;
size_t xspathsize;
const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */
/* If the frontend requested 1 queue, or we have fallen back
* to single queue due to lack of frontend support for multi-
* queue, expect the remaining XenStore keys in the toplevel
* directory. Otherwise, expect them in a subdirectory called
* queue-N.
*/
if (num_queues == 1) {
xspath = kzalloc(strlen(dev->otherend) + 1, GFP_KERNEL);
if (!xspath) {
xenbus_dev_fatal(dev, -ENOMEM,
"reading ring references");
return -ENOMEM;
}
strcpy(xspath, dev->otherend);
} else {
xspathsize = strlen(dev->otherend) + xenstore_path_ext_size;
xspath = kzalloc(xspathsize, GFP_KERNEL);
if (!xspath) {
xenbus_dev_fatal(dev, -ENOMEM,
"reading ring references");
return -ENOMEM;
}
snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend,
queue->id);
}
err = xenbus_gather(XBT_NIL, xspath,
"tx-ring-ref", "%lu", &tx_ring_ref,
"rx-ring-ref", "%lu", &rx_ring_ref, NULL);
if (err) {
xenbus_dev_fatal(dev, err,
"reading %s/ring-ref",
xspath);
goto err;
}
/* Try split event channels first, then single event channel. */
err = xenbus_gather(XBT_NIL, xspath,
"event-channel-tx", "%u", &tx_evtchn,
"event-channel-rx", "%u", &rx_evtchn, NULL);
if (err < 0) {
err = xenbus_scanf(XBT_NIL, xspath,
"event-channel", "%u", &tx_evtchn);
if (err < 0) {
xenbus_dev_fatal(dev, err,
"reading %s/event-channel(-tx/rx)",
xspath);
goto err;
}
rx_evtchn = tx_evtchn;
}
/* Map the shared frame, irq etc. */
err = xenvif_connect(queue, tx_ring_ref, rx_ring_ref,
tx_evtchn, rx_evtchn);
if (err) {
xenbus_dev_fatal(dev, err,
"mapping shared-frames %lu/%lu port tx %u rx %u",
tx_ring_ref, rx_ring_ref,
tx_evtchn, rx_evtchn);
goto err;
}
err = 0;
err: /* Regular return falls through with err == 0 */
kfree(xspath);
return err;
}
static int connect_rings(struct backend_info *be)
{
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
grant_ref_t tx_ring_refs[MAX_PAGES_PER_RING], rx_ring_refs[MAX_PAGES_PER_RING];
unsigned int evtchn, rx_copy, nr_ring_pages;
unsigned multipage;
int i;
int err;
int val;
char pathbuf[64];
err = xenbus_scanf(XBT_NIL, dev->otherend, "nr-ring-pages", "%u",
&nr_ring_pages);
if (err == -ENOENT) {
err = 0;
nr_ring_pages = 1;
multipage = 0;
} else {
multipage = 1;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/nr-ring-pages",
dev->otherend);
return err;
}
if (nr_ring_pages < 1 ||
nr_ring_pages > MAX_PAGES_PER_RING ||
(!xen_pv_domain() && nr_ring_pages > 1) ||
(nr_ring_pages & (nr_ring_pages - 1))) {
xenbus_dev_fatal(dev,
err,
"error in %s/nr-ring-pages: should be a power of two between 1 and %d, was %u",
dev->otherend,
xen_pv_domain() ? MAX_PAGES_PER_RING : 1, nr_ring_pages);
return -EINVAL;
}
vif->nr_ring_pages = nr_ring_pages;
err = xenbus_scanf(XBT_NIL, dev->otherend, "event-channel", "%u", &evtchn);
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/event-channel", dev->otherend);
return err;
}
if (multipage) {
for (i = 0; i < nr_ring_pages; i++) {
sprintf(pathbuf, "tx-ring-ref-%d", i);
err = xenbus_scanf(XBT_NIL, dev->otherend, pathbuf, "%u", &tx_ring_refs[i]);
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/%s", dev->otherend, pathbuf);
return err;
}
sprintf(pathbuf, "rx-ring-ref-%d", i);
err = xenbus_scanf(XBT_NIL, dev->otherend, pathbuf, "%u", &rx_ring_refs[i]);
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/%s", dev->otherend, pathbuf);
return err;
}
}
} else {
err = xenbus_gather(XBT_NIL, dev->otherend,
"tx-ring-ref", "%lu", &tx_ring_refs[0],
"rx-ring-ref", "%lu", &rx_ring_refs[0],
NULL);
if (err) {
xenbus_dev_fatal(dev, err,
"reading %s/ring-refs",
dev->otherend);
return err;
}
}
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
err = 0;
rx_copy = 0;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
dev->otherend);
return err;
}
if (!rx_copy)
return -EOPNOTSUPP;
if (vif->dev->tx_queue_len != 0) {
if (xenbus_scanf(XBT_NIL, dev->otherend,
"feature-rx-notify", "%d", &val) < 0)
val = 0;
if (val)
vif->can_queue = 1;
else
/* Must be non-zero for pfifo_fast to work. */
vif->dev->tx_queue_len = 1;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
"%d", &val) < 0)
val = 0;
vif->can_sg = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
"%d", &val) < 0)
val = 0;
vif->gso = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix",
"%d", &val) < 0)
val = 0;
vif->gso_prefix = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
"%d", &val) < 0)
val = 0;
vif->csum = !val;
/* Map the shared frame, irq etc. */
err = xenvif_connect(vif, tx_ring_refs, rx_ring_refs, evtchn, nr_ring_pages);
if (err) {
xenbus_dev_fatal(dev, err,
"mapping shared-frames %u/%u port %u",
tx_ring_refs[0], rx_ring_refs[0], evtchn);
return err;
}
return 0;
}
