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Date: Fri, 15 Feb 2013 16:00:06 +0000
From: Wei Liu <wei.liu2@...rix.com>
To: <xen-devel@...ts.xen.org>, <netdev@...r.kernel.org>,
<ian.campbell@...rix.com>, <konrad.wilk@...cle.com>,
<annie.li@...cle.com>
CC: Wei Liu <wei.liu2@...rix.com>
Subject: [PATCH 5/8] netback: multi-page ring support
Signed-off-by: Wei Liu <wei.liu2@...rix.com>
---
drivers/net/xen-netback/common.h | 30 ++++++--
drivers/net/xen-netback/interface.c | 46 +++++++++--
drivers/net/xen-netback/netback.c | 73 ++++++++----------
drivers/net/xen-netback/xenbus.c | 143 +++++++++++++++++++++++++++++++++--
4 files changed, 229 insertions(+), 63 deletions(-)
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 35d8772..f541ba9 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -45,6 +45,12 @@
#include <xen/grant_table.h>
#include <xen/xenbus.h>
+#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 XEN_NETIF_TX_RING_SIZE(NETBK_MAX_RING_PAGES)
+#define NETBK_MAX_RX_RING_SIZE XEN_NETIF_RX_RING_SIZE(NETBK_MAX_RING_PAGES)
+
struct xen_netbk;
struct xenvif {
@@ -66,6 +72,8 @@ struct xenvif {
/* The shared rings and indexes. */
struct xen_netif_tx_back_ring tx;
struct xen_netif_rx_back_ring rx;
+ unsigned int nr_tx_handles;
+ unsigned int nr_rx_handles;
/* Frontend feature information. */
u8 can_sg:1;
@@ -105,15 +113,19 @@ static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif)
return to_xenbus_device(vif->dev->dev.parent);
}
-#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 XEN_NETIF_TX_RING_SIZE(_nr_pages) \
+ __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE * (_nr_pages))
+#define XEN_NETIF_RX_RING_SIZE(_nr_pages) \
+ __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE * (_nr_pages))
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);
void xenvif_get(struct xenvif *vif);
@@ -129,10 +141,12 @@ int xen_netbk_rx_ring_full(struct xenvif *vif);
int xen_netbk_must_stop_queue(struct xenvif *vif);
/* (Un)Map communication rings. */
-void xen_netbk_unmap_frontend_rings(struct xenvif *vif);
+void xen_netbk_unmap_frontend_rings(struct xenvif *vif, void *addr);
int xen_netbk_map_frontend_rings(struct xenvif *vif,
- grant_ref_t tx_ring_ref,
- grant_ref_t rx_ring_ref);
+ void **addr,
+ int domid,
+ int *ring_ref,
+ unsigned int ring_ref_count);
/* (De)Register a xenvif with the netback backend. */
void xen_netbk_add_xenvif(struct xenvif *vif);
@@ -158,4 +172,6 @@ void xenvif_carrier_off(struct xenvif *vif);
/* Returns number of ring slots required to send an skb to the frontend */
unsigned int xen_netbk_count_skb_slots(struct xenvif *vif, struct sk_buff *skb);
+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 db638e1..fa4d46d 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -305,10 +305,16 @@ 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)
@@ -316,15 +322,36 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
__module_get(THIS_MODULE);
- err = xen_netbk_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
+ for (i = 0; i < tx_ring_ref_count; i++)
+ tmp[i] = tx_ring_ref[i];
+
+ err = xen_netbk_map_frontend_rings(vif, &addr, vif->domid,
+ tmp, tx_ring_ref_count);
if (err < 0)
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 = xen_netbk_map_frontend_rings(vif, &addr, vif->domid,
+ tmp, rx_ring_ref_count);
+
+ if (err < 0)
+ 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);
@@ -340,8 +367,12 @@ int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
rtnl_unlock();
return 0;
-err_unmap:
- xen_netbk_unmap_frontend_rings(vif);
+err_rx_unmap:
+ xen_netbk_unmap_frontend_rings(vif, (void *)vif->rx.sring);
+ vif->nr_rx_handles = 0;
+err_tx_unmap:
+ xen_netbk_unmap_frontend_rings(vif, (void *)vif->tx.sring);
+ vif->nr_tx_handles = 0;
err:
module_put(THIS_MODULE);
return err;
@@ -382,7 +413,8 @@ void xenvif_disconnect(struct xenvif *vif)
unregister_netdev(vif->dev);
- xen_netbk_unmap_frontend_rings(vif);
+ xen_netbk_unmap_frontend_rings(vif, (void *)vif->tx.sring);
+ xen_netbk_unmap_frontend_rings(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 98ccea9..644c760 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -47,6 +47,19 @@
#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");
+
+
struct pending_tx_info {
struct xen_netif_tx_request req;
struct xenvif *vif;
@@ -59,7 +72,7 @@ struct netbk_rx_meta {
int gso_size;
};
-#define MAX_PENDING_REQS 256
+#define MAX_PENDING_REQS NETBK_MAX_TX_RING_SIZE
/* Discriminate from any valid pending_idx value. */
#define INVALID_PENDING_IDX 0xFFFF
@@ -111,8 +124,8 @@ struct xen_netbk {
* head/fragment page uses 2 copy operations because it
* straddles two buffers in the frontend.
*/
- struct gnttab_copy grant_copy_op[2*XEN_NETIF_RX_RING_SIZE];
- struct netbk_rx_meta meta[2*XEN_NETIF_RX_RING_SIZE];
+ struct gnttab_copy grant_copy_op[2*NETBK_MAX_RX_RING_SIZE];
+ struct netbk_rx_meta meta[2*NETBK_MAX_RX_RING_SIZE];
};
static struct xen_netbk *xen_netbk;
@@ -262,7 +275,8 @@ int xen_netbk_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 +
+ XEN_NETIF_RX_RING_SIZE(vif->nr_rx_handles) - peek) < needed);
}
int xen_netbk_must_stop_queue(struct xenvif *vif)
@@ -657,7 +671,8 @@ static void xen_netbk_rx_action(struct xen_netbk *netbk)
__skb_queue_tail(&rxq, skb);
/* Filled the batch queue? */
- if (count + MAX_SKB_FRAGS >= XEN_NETIF_RX_RING_SIZE)
+ if (count + MAX_SKB_FRAGS >=
+ XEN_NETIF_RX_RING_SIZE(vif->nr_rx_handles))
break;
}
@@ -1292,12 +1307,12 @@ static unsigned xen_netbk_tx_build_gops(struct xen_netbk *netbk)
continue;
if (vif->tx.sring->req_prod - vif->tx.req_cons >
- XEN_NETIF_TX_RING_SIZE) {
+ XEN_NETIF_TX_RING_SIZE(vif->nr_tx_handles)) {
netdev_err(vif->dev,
"Impossible number of requests. "
"req_prod %d, req_cons %d, size %ld\n",
vif->tx.sring->req_prod, vif->tx.req_cons,
- XEN_NETIF_TX_RING_SIZE);
+ XEN_NETIF_TX_RING_SIZE(vif->nr_tx_handles));
netbk_fatal_tx_err(vif);
continue;
}
@@ -1644,48 +1659,22 @@ static int xen_netbk_kthread(void *data)
return 0;
}
-void xen_netbk_unmap_frontend_rings(struct xenvif *vif)
+void xen_netbk_unmap_frontend_rings(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 xen_netbk_map_frontend_rings(struct xenvif *vif,
- grant_ref_t tx_ring_ref,
- grant_ref_t rx_ring_ref)
+ 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;
-
- 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);
+ int err = 0;
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:
- xen_netbk_unmap_frontend_rings(vif);
+ ring_ref, ring_ref_count, vaddr);
return err;
}
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 65d14f2..1791807 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -114,6 +114,33 @@ static int netback_probe(struct xenbus_device *dev,
goto abort_transaction;
}
+ /* Multi-page ring support */
+ if (MODPARM_netback_max_tx_ring_page_order >
+ NETBK_MAX_RING_PAGE_ORDER)
+ MODPARM_netback_max_tx_ring_page_order =
+ NETBK_MAX_RING_PAGE_ORDER;
+ 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;
+ }
+
+ if (MODPARM_netback_max_rx_ring_page_order >
+ NETBK_MAX_RING_PAGE_ORDER)
+ MODPARM_netback_max_rx_ring_page_order =
+ NETBK_MAX_RING_PAGE_ORDER;
+ 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);
@@ -392,22 +419,107 @@ 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) {
@@ -454,11 +566,28 @@ 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) {
+ /* construct 1 2 3 / 4 5 6 */
+ int i;
+ char txs[3 * (1U << MODPARM_netback_max_tx_ring_page_order)];
+ char rxs[3 * (1U << MODPARM_netback_max_rx_ring_page_order)];
+
+ txs[0] = rxs[0] = 0;
+
+ for (i = 0; i < (1U << tx_ring_order); i++)
+ snprintf(txs+strlen(txs), sizeof(txs)-strlen(txs)-1,
+ " %lu", tx_ring_ref[i]);
+
+ for (i = 0; i < (1U << rx_ring_order); i++)
+ snprintf(rxs+strlen(rxs), sizeof(rxs)-strlen(rxs)-1,
+ " %lu", rx_ring_ref[i]);
+
xenbus_dev_fatal(dev, err,
- "mapping shared-frames %lu/%lu port %u",
- tx_ring_ref, rx_ring_ref, evtchn);
+ "mapping shared-frames%s /%s port %u",
+ txs, rxs, evtchn);
return err;
}
return 0;
--
1.7.10.4
--
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