Merge tag '9p-for-5.8' of git://github.com/martinetd/linux
Pull 9p update from Dominique Martinet:
"Another very quiet cycle... Only one commit: increase the size of the
ring used for xen transport"
* tag '9p-for-5.8' of git://github.com/martinetd/linux:
9p/xen: increase XEN_9PFS_RING_ORDER
diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c
index 3963eb1..3debad9 100644
--- a/net/9p/trans_xen.c
+++ b/net/9p/trans_xen.c
@@ -43,8 +43,8 @@
#include <net/9p/transport.h>
#define XEN_9PFS_NUM_RINGS 2
-#define XEN_9PFS_RING_ORDER 6
-#define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
+#define XEN_9PFS_RING_ORDER 9
+#define XEN_9PFS_RING_SIZE(ring) XEN_FLEX_RING_SIZE(ring->intf->ring_order)
struct xen_9pfs_header {
uint32_t size;
@@ -132,8 +132,8 @@
prod = ring->intf->out_prod;
virt_mb();
- return XEN_9PFS_RING_SIZE -
- xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE) >= size;
+ return XEN_9PFS_RING_SIZE(ring) -
+ xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE(ring)) >= size;
}
static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
@@ -167,17 +167,18 @@
prod = ring->intf->out_prod;
virt_mb();
- if (XEN_9PFS_RING_SIZE - xen_9pfs_queued(prod, cons,
- XEN_9PFS_RING_SIZE) < size) {
+ if (XEN_9PFS_RING_SIZE(ring) -
+ xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE(ring)) < size) {
spin_unlock_irqrestore(&ring->lock, flags);
goto again;
}
- masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
- masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+ masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE(ring));
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE(ring));
xen_9pfs_write_packet(ring->data.out, p9_req->tc.sdata, size,
- &masked_prod, masked_cons, XEN_9PFS_RING_SIZE);
+ &masked_prod, masked_cons,
+ XEN_9PFS_RING_SIZE(ring));
p9_req->status = REQ_STATUS_SENT;
virt_wmb(); /* write ring before updating pointer */
@@ -207,19 +208,19 @@
prod = ring->intf->in_prod;
virt_rmb();
- if (xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE) <
+ if (xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE(ring)) <
sizeof(h)) {
notify_remote_via_irq(ring->irq);
return;
}
- masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
- masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+ masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE(ring));
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE(ring));
/* First, read just the header */
xen_9pfs_read_packet(&h, ring->data.in, sizeof(h),
masked_prod, &masked_cons,
- XEN_9PFS_RING_SIZE);
+ XEN_9PFS_RING_SIZE(ring));
req = p9_tag_lookup(priv->client, h.tag);
if (!req || req->status != REQ_STATUS_SENT) {
@@ -233,11 +234,11 @@
memcpy(&req->rc, &h, sizeof(h));
req->rc.offset = 0;
- masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE(ring));
/* Then, read the whole packet (including the header) */
xen_9pfs_read_packet(req->rc.sdata, ring->data.in, h.size,
masked_prod, &masked_cons,
- XEN_9PFS_RING_SIZE);
+ XEN_9PFS_RING_SIZE(ring));
virt_mb();
cons += h.size;
@@ -267,7 +268,7 @@
static struct p9_trans_module p9_xen_trans = {
.name = "xen",
- .maxsize = 1 << (XEN_9PFS_RING_ORDER + XEN_PAGE_SHIFT),
+ .maxsize = 1 << (XEN_9PFS_RING_ORDER + XEN_PAGE_SHIFT - 2),
.def = 1,
.create = p9_xen_create,
.close = p9_xen_close,
@@ -295,14 +296,16 @@
if (priv->rings[i].irq > 0)
unbind_from_irqhandler(priv->rings[i].irq, priv->dev);
if (priv->rings[i].data.in) {
- for (j = 0; j < (1 << XEN_9PFS_RING_ORDER); j++) {
+ for (j = 0;
+ j < (1 << priv->rings[i].intf->ring_order);
+ j++) {
grant_ref_t ref;
ref = priv->rings[i].intf->ref[j];
gnttab_end_foreign_access(ref, 0, 0);
}
free_pages((unsigned long)priv->rings[i].data.in,
- XEN_9PFS_RING_ORDER -
+ priv->rings[i].intf->ring_order -
(PAGE_SHIFT - XEN_PAGE_SHIFT));
}
gnttab_end_foreign_access(priv->rings[i].ref, 0, 0);
@@ -323,7 +326,8 @@
}
static int xen_9pfs_front_alloc_dataring(struct xenbus_device *dev,
- struct xen_9pfs_dataring *ring)
+ struct xen_9pfs_dataring *ring,
+ unsigned int order)
{
int i = 0;
int ret = -ENOMEM;
@@ -342,21 +346,21 @@
goto out;
ring->ref = ret;
bytes = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
- XEN_9PFS_RING_ORDER - (PAGE_SHIFT - XEN_PAGE_SHIFT));
+ order - (PAGE_SHIFT - XEN_PAGE_SHIFT));
if (!bytes) {
ret = -ENOMEM;
goto out;
}
- for (; i < (1 << XEN_9PFS_RING_ORDER); i++) {
+ for (; i < (1 << order); i++) {
ret = gnttab_grant_foreign_access(
dev->otherend_id, virt_to_gfn(bytes) + i, 0);
if (ret < 0)
goto out;
ring->intf->ref[i] = ret;
}
- ring->intf->ring_order = XEN_9PFS_RING_ORDER;
+ ring->intf->ring_order = order;
ring->data.in = bytes;
- ring->data.out = bytes + XEN_9PFS_RING_SIZE;
+ ring->data.out = bytes + XEN_FLEX_RING_SIZE(order);
ret = xenbus_alloc_evtchn(dev, &ring->evtchn);
if (ret)
@@ -374,7 +378,7 @@
for (i--; i >= 0; i--)
gnttab_end_foreign_access(ring->intf->ref[i], 0, 0);
free_pages((unsigned long)bytes,
- XEN_9PFS_RING_ORDER -
+ ring->intf->ring_order -
(PAGE_SHIFT - XEN_PAGE_SHIFT));
}
gnttab_end_foreign_access(ring->ref, 0, 0);
@@ -404,8 +408,10 @@
return -EINVAL;
max_ring_order = xenbus_read_unsigned(dev->otherend,
"max-ring-page-order", 0);
- if (max_ring_order < XEN_9PFS_RING_ORDER)
- return -EINVAL;
+ if (max_ring_order > XEN_9PFS_RING_ORDER)
+ max_ring_order = XEN_9PFS_RING_ORDER;
+ if (p9_xen_trans.maxsize > XEN_FLEX_RING_SIZE(max_ring_order))
+ p9_xen_trans.maxsize = XEN_FLEX_RING_SIZE(max_ring_order) / 2;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -422,7 +428,8 @@
for (i = 0; i < priv->num_rings; i++) {
priv->rings[i].priv = priv;
- ret = xen_9pfs_front_alloc_dataring(dev, &priv->rings[i]);
+ ret = xen_9pfs_front_alloc_dataring(dev, &priv->rings[i],
+ max_ring_order);
if (ret < 0)
goto error;
}
