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Date: Thu, 2 Feb 2012 16:49:20 +0000
From: Wei Liu <wei.liu2@...rix.com>
To: netdev@...r.kernel.org, xen-devel@...ts.xensource.com
CC: ian.campbell@...rix.com, konrad.wilk@...cle.com,
Wei Liu <wei.liu2@...rix.com>
Subject: [RFC PATCH V4 10/13] netback: multi page ring support
Extend netback to support multi page ring.
Signed-off-by: Wei Liu <wei.liu2@...rix.com>
---
drivers/net/xen-netback/common.h | 35 +++++++---
drivers/net/xen-netback/interface.c | 43 ++++++++++--
drivers/net/xen-netback/netback.c | 74 ++++++++------------
drivers/net/xen-netback/xenbus.c | 129 +++++++++++++++++++++++++++++++++--
4 files changed, 213 insertions(+), 68 deletions(-)
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index b7d4442..1bb16ec 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -59,10 +59,18 @@ struct xenvif_rx_meta {
#define MAX_BUFFER_OFFSET PAGE_SIZE
-#define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE)
-#define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
+#define NETBK_TX_RING_SIZE(_nr_pages) \
+ (__CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE * (_nr_pages)))
+#define NETBK_RX_RING_SIZE(_nr_pages) \
+ (__CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE * (_nr_pages)))
-#define MAX_PENDING_REQS 256
+#define NETBK_MAX_RING_PAGE_ORDER XENBUS_MAX_RING_PAGE_ORDER
+#define NETBK_MAX_RING_PAGES (1U << NETBK_MAX_RING_PAGE_ORDER)
+
+#define NETBK_MAX_TX_RING_SIZE NETBK_TX_RING_SIZE(NETBK_MAX_RING_PAGES)
+#define NETBK_MAX_RX_RING_SIZE NETBK_RX_RING_SIZE(NETBK_MAX_RING_PAGES)
+
+#define MAX_PENDING_REQS NETBK_MAX_TX_RING_SIZE
struct xenvif {
/* Unique identifier for this interface. */
@@ -83,6 +91,8 @@ struct xenvif {
/* The shared rings and indexes. */
struct xen_netif_tx_back_ring tx;
struct xen_netif_rx_back_ring rx;
+ int nr_tx_handles;
+ int nr_rx_handles;
/* Frontend feature information. */
u8 can_sg:1;
@@ -132,8 +142,10 @@ struct xenvif *xenvif_alloc(struct device *parent,
domid_t domid,
unsigned int handle);
-int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
- unsigned long rx_ring_ref, unsigned int evtchn);
+int xenvif_connect(struct xenvif *vif,
+ unsigned long tx_ring_ref[], unsigned int tx_ring_order,
+ unsigned long rx_ring_ref[], unsigned int rx_ring_order,
+ unsigned int evtchn);
void xenvif_disconnect(struct xenvif *vif);
int xenvif_xenbus_init(void);
@@ -146,10 +158,12 @@ int xenvif_rx_ring_full(struct xenvif *vif);
int xenvif_must_stop_queue(struct xenvif *vif);
/* (Un)Map communication rings. */
-void xenvif_unmap_frontend_rings(struct xenvif *vif);
-int xenvif_map_frontend_rings(struct xenvif *vif,
- grant_ref_t tx_ring_ref,
- grant_ref_t rx_ring_ref);
+void xenvif_unmap_frontend_ring(struct xenvif *vif, void *addr);
+int xenvif_map_frontend_ring(struct xenvif *vif,
+ void **vaddr,
+ int domid,
+ int ring_ref[],
+ unsigned int ring_ref_count);
/* Check for SKBs from frontend and schedule backend processing */
void xenvif_check_rx_xenvif(struct xenvif *vif);
@@ -167,4 +181,7 @@ void xenvif_rx_action(struct xenvif *vif);
int xenvif_kthread(void *data);
+extern unsigned int MODPARM_netback_max_tx_ring_page_order;
+extern unsigned int MODPARM_netback_max_rx_ring_page_order;
+
#endif /* __XEN_NETBACK__COMMON_H__ */
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index b2bde8f..e1aa003 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -319,10 +319,16 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
return vif;
}
-int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
- unsigned long rx_ring_ref, unsigned int evtchn)
+int xenvif_connect(struct xenvif *vif,
+ unsigned long tx_ring_ref[], unsigned int tx_ring_ref_count,
+ unsigned long rx_ring_ref[], unsigned int rx_ring_ref_count,
+ unsigned int evtchn)
{
int err = -ENOMEM;
+ void *addr;
+ struct xen_netif_tx_sring *txs;
+ struct xen_netif_rx_sring *rxs;
+ int tmp[NETBK_MAX_RING_PAGES], i;
/* Already connected through? */
if (vif->irq)
@@ -330,15 +336,33 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
__module_get(THIS_MODULE);
- err = xenvif_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
- if (err < 0)
+ for (i = 0; i < tx_ring_ref_count; i++)
+ tmp[i] = tx_ring_ref[i];
+
+ err = xenvif_map_frontend_ring(vif, &addr, vif->domid,
+ tmp, tx_ring_ref_count);
+ if (err)
goto err;
+ txs = addr;
+ BACK_RING_INIT(&vif->tx, txs, PAGE_SIZE * tx_ring_ref_count);
+ vif->nr_tx_handles = tx_ring_ref_count;
+
+ for (i = 0; i < rx_ring_ref_count; i++)
+ tmp[i] = rx_ring_ref[i];
+
+ err = xenvif_map_frontend_ring(vif, &addr, vif->domid,
+ tmp, rx_ring_ref_count);
+ if (err)
+ goto err_tx_unmap;
+ rxs = addr;
+ BACK_RING_INIT(&vif->rx, rxs, PAGE_SIZE * rx_ring_ref_count);
+ vif->nr_rx_handles = rx_ring_ref_count;
err = bind_interdomain_evtchn_to_irqhandler(
vif->domid, evtchn, xenvif_interrupt, 0,
vif->dev->name, vif);
if (err < 0)
- goto err_unmap;
+ goto err_rx_unmap;
vif->irq = err;
disable_irq(vif->irq);
@@ -366,8 +390,10 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
return 0;
err_unbind:
unbind_from_irqhandler(vif->irq, vif);
-err_unmap:
- xenvif_unmap_frontend_rings(vif);
+err_rx_unmap:
+ xenvif_unmap_frontend_ring(vif, (void *)vif->tx.sring);
+err_tx_unmap:
+ xenvif_unmap_frontend_ring(vif, (void *)vif->rx.sring);
err:
module_put(THIS_MODULE);
return err;
@@ -400,7 +426,8 @@ void xenvif_disconnect(struct xenvif *vif)
unregister_netdev(vif->dev);
- xenvif_unmap_frontend_rings(vif);
+ xenvif_unmap_frontend_ring(vif, (void *)vif->tx.sring);
+ xenvif_unmap_frontend_ring(vif, (void *)vif->rx.sring);
free_netdev(vif->dev);
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index cb1a661..60c8951 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -49,6 +49,17 @@
#include <asm/xen/hypercall.h>
#include <asm/xen/page.h>
+unsigned int MODPARM_netback_max_rx_ring_page_order = NETBK_MAX_RING_PAGE_ORDER;
+module_param_named(netback_max_rx_ring_page_order,
+ MODPARM_netback_max_rx_ring_page_order, uint, 0);
+MODULE_PARM_DESC(netback_max_rx_ring_page_order,
+ "Maximum supported receiver ring page order");
+
+unsigned int MODPARM_netback_max_tx_ring_page_order = NETBK_MAX_RING_PAGE_ORDER;
+module_param_named(netback_max_tx_ring_page_order,
+ MODPARM_netback_max_tx_ring_page_order, uint, 0);
+MODULE_PARM_DESC(netback_max_tx_ring_page_order,
+ "Maximum supported transmitter ring page order");
DEFINE_PER_CPU(struct gnttab_copy *, tx_copy_ops);
@@ -134,7 +145,8 @@ int xenvif_rx_ring_full(struct xenvif *vif)
RING_IDX needed = max_required_rx_slots(vif);
return ((vif->rx.sring->req_prod - peek) < needed) ||
- ((vif->rx.rsp_prod_pvt + XEN_NETIF_RX_RING_SIZE - peek) < needed);
+ ((vif->rx.rsp_prod_pvt +
+ NETBK_RX_RING_SIZE(vif->nr_rx_handles) - peek) < needed);
}
int xenvif_must_stop_queue(struct xenvif *vif)
@@ -520,7 +532,8 @@ void xenvif_rx_action(struct xenvif *vif)
__skb_queue_tail(&rxq, skb);
/* Filled the batch queue? */
- if (count + MAX_SKB_FRAGS >= XEN_NETIF_RX_RING_SIZE)
+ if (count + MAX_SKB_FRAGS >=
+ NETBK_RX_RING_SIZE(vif->nr_rx_handles))
break;
}
@@ -532,7 +545,7 @@ void xenvif_rx_action(struct xenvif *vif)
return;
}
- BUG_ON(npo.copy_prod > (2 * XEN_NETIF_RX_RING_SIZE));
+ BUG_ON(npo.copy_prod > (2 * NETBK_MAX_RX_RING_SIZE));
ret = HYPERVISOR_grant_table_op(GNTTABOP_copy, gco,
npo.copy_prod);
BUG_ON(ret != 0);
@@ -1419,48 +1432,22 @@ static inline int tx_work_todo(struct xenvif *vif)
return 0;
}
-void xenvif_unmap_frontend_rings(struct xenvif *vif)
+void xenvif_unmap_frontend_ring(struct xenvif *vif, void *addr)
{
- if (vif->tx.sring)
- xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
- vif->tx.sring);
- if (vif->rx.sring)
- xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
- vif->rx.sring);
+ if (addr)
+ xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif), addr);
}
-int xenvif_map_frontend_rings(struct xenvif *vif,
- grant_ref_t tx_ring_ref,
- grant_ref_t rx_ring_ref)
+int xenvif_map_frontend_ring(struct xenvif *vif,
+ void **vaddr,
+ int domid,
+ int ring_ref[],
+ unsigned int ring_ref_count)
{
- void *addr;
- struct xen_netif_tx_sring *txs;
- struct xen_netif_rx_sring *rxs;
-
- int err = -ENOMEM;
+ int err = 0;
err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif),
- &tx_ring_ref, 1, &addr);
- if (err)
- goto err;
-
- txs = (struct xen_netif_tx_sring *)addr;
- BACK_RING_INIT(&vif->tx, txs, PAGE_SIZE);
-
- err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif),
- &rx_ring_ref, 1, &addr);
- if (err)
- goto err;
-
- rxs = (struct xen_netif_rx_sring *)addr;
- BACK_RING_INIT(&vif->rx, rxs, PAGE_SIZE);
-
- vif->rx_req_cons_peek = 0;
-
- return 0;
-
-err:
- xenvif_unmap_frontend_rings(vif);
+ ring_ref, ring_ref_count, vaddr);
return err;
}
@@ -1486,7 +1473,6 @@ int xenvif_kthread(void *data)
static int __create_percpu_scratch_space(unsigned int cpu)
{
- /* Guard against race condition */
if (per_cpu(tx_copy_ops, cpu) ||
per_cpu(grant_copy_op, cpu) ||
per_cpu(meta, cpu))
@@ -1502,19 +1488,19 @@ static int __create_percpu_scratch_space(unsigned int cpu)
per_cpu(grant_copy_op, cpu) =
vzalloc_node(sizeof(struct gnttab_copy)
- * 2 * XEN_NETIF_RX_RING_SIZE, cpu_to_node(cpu));
+ * 2 * NETBK_MAX_RX_RING_SIZE, cpu_to_node(cpu));
if (!per_cpu(grant_copy_op, cpu))
per_cpu(grant_copy_op, cpu) =
vzalloc(sizeof(struct gnttab_copy)
- * 2 * XEN_NETIF_RX_RING_SIZE);
+ * 2 * NETBK_MAX_RX_RING_SIZE);
per_cpu(meta, cpu) = vzalloc_node(sizeof(struct xenvif_rx_meta)
- * 2 * XEN_NETIF_RX_RING_SIZE,
+ * 2 * NETBK_MAX_RX_RING_SIZE,
cpu_to_node(cpu));
if (!per_cpu(meta, cpu))
per_cpu(meta, cpu) = vzalloc(sizeof(struct xenvif_rx_meta)
- * 2 * XEN_NETIF_RX_RING_SIZE);
+ * 2 * NETBK_MAX_RX_RING_SIZE);
if (!per_cpu(tx_copy_ops, cpu) ||
!per_cpu(grant_copy_op, cpu) ||
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index f1e89ca..79499fc 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -113,6 +113,23 @@ static int netback_probe(struct xenbus_device *dev,
message = "writing feature-rx-flip";
goto abort_transaction;
}
+ err = xenbus_printf(xbt, dev->nodename,
+ "max-tx-ring-page-order",
+ "%u",
+ MODPARM_netback_max_tx_ring_page_order);
+ if (err) {
+ message = "writing max-tx-ring-page-order";
+ goto abort_transaction;
+ }
+
+ err = xenbus_printf(xbt, dev->nodename,
+ "max-rx-ring-page-order",
+ "%u",
+ MODPARM_netback_max_rx_ring_page_order);
+ if (err) {
+ message = "writing max-rx-ring-page-order";
+ goto abort_transaction;
+ }
err = xenbus_transaction_end(xbt, 0);
} while (err == -EAGAIN);
@@ -391,22 +408,108 @@ 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;
+ unsigned long tx_ring_ref[NETBK_MAX_RING_PAGES];
+ unsigned long rx_ring_ref[NETBK_MAX_RING_PAGES];
+ unsigned int tx_ring_order;
+ unsigned int rx_ring_order;
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",
+ "reading %s/event-channel",
dev->otherend);
return err;
}
+ err = xenbus_scanf(XBT_NIL, dev->otherend, "tx-ring-order", "%u",
+ &tx_ring_order);
+ if (err < 0) {
+ tx_ring_order = 0;
+
+ err = xenbus_scanf(XBT_NIL, dev->otherend, "tx-ring-ref", "%lu",
+ &tx_ring_ref[0]);
+ if (err < 0) {
+ xenbus_dev_fatal(dev, err, "reading %s/tx-ring-ref",
+ dev->otherend);
+ return err;
+ }
+ } else {
+ unsigned int i;
+
+ if (tx_ring_order > MODPARM_netback_max_tx_ring_page_order) {
+ err = -EINVAL;
+
+ xenbus_dev_fatal(dev, err,
+ "%s/tx-ring-page-order too big",
+ dev->otherend);
+ return err;
+ }
+
+ for (i = 0; i < (1U << tx_ring_order); i++) {
+ char ring_ref_name[sizeof("tx-ring-ref") + 2];
+
+ snprintf(ring_ref_name, sizeof(ring_ref_name),
+ "tx-ring-ref%u", i);
+
+ err = xenbus_scanf(XBT_NIL, dev->otherend,
+ ring_ref_name, "%lu",
+ &tx_ring_ref[i]);
+ if (err < 0) {
+ xenbus_dev_fatal(dev, err,
+ "reading %s/%s",
+ dev->otherend,
+ ring_ref_name);
+ return err;
+ }
+ }
+ }
+
+ err = xenbus_scanf(XBT_NIL, dev->otherend, "rx-ring-order", "%u",
+ &rx_ring_order);
+ if (err < 0) {
+ rx_ring_order = 0;
+ err = xenbus_scanf(XBT_NIL, dev->otherend, "rx-ring-ref", "%lu",
+ &rx_ring_ref[0]);
+ if (err < 0) {
+ xenbus_dev_fatal(dev, err, "reading %s/rx-ring-ref",
+ dev->otherend);
+ return err;
+ }
+ } else {
+ unsigned int i;
+
+ if (rx_ring_order > MODPARM_netback_max_rx_ring_page_order) {
+ err = -EINVAL;
+
+ xenbus_dev_fatal(dev, err,
+ "%s/rx-ring-page-order too big",
+ dev->otherend);
+ return err;
+ }
+
+ for (i = 0; i < (1U << rx_ring_order); i++) {
+ char ring_ref_name[sizeof("rx-ring-ref") + 2];
+
+ snprintf(ring_ref_name, sizeof(ring_ref_name),
+ "rx-ring-ref%u", i);
+
+ err = xenbus_scanf(XBT_NIL, dev->otherend,
+ ring_ref_name, "%lu",
+ &rx_ring_ref[i]);
+ if (err < 0) {
+ xenbus_dev_fatal(dev, err,
+ "reading %s/%s",
+ dev->otherend,
+ ring_ref_name);
+ return err;
+ }
+ }
+ }
+
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
@@ -453,11 +556,23 @@ static int connect_rings(struct backend_info *be)
vif->csum = !val;
/* Map the shared frame, irq etc. */
- err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref, evtchn);
+ err = xenvif_connect(vif,
+ tx_ring_ref, (1U << tx_ring_order),
+ rx_ring_ref, (1U << rx_ring_order),
+ evtchn);
if (err) {
+ int i;
xenbus_dev_fatal(dev, err,
- "mapping shared-frames %lu/%lu port %u",
- tx_ring_ref, rx_ring_ref, evtchn);
+ "binding port %u",
+ evtchn);
+ for (i = 0; i < (1U << tx_ring_order); i++)
+ xenbus_dev_fatal(dev, err,
+ "mapping tx ring handle: %lu",
+ tx_ring_ref[i]);
+ for (i = 0; i < (1U << rx_ring_order); i++)
+ xenbus_dev_fatal(dev, err,
+ "mapping rx ring handle: %lu",
+ tx_ring_ref[i]);
return err;
}
return 0;
--
1.7.2.5
--
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