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Diffstat (limited to 'drivers/net/xen-netback')
-rw-r--r--drivers/net/xen-netback/common.h4
-rw-r--r--drivers/net/xen-netback/interface.c6
-rw-r--r--drivers/net/xen-netback/netback.c55
-rw-r--r--drivers/net/xen-netback/xenbus.c36
4 files changed, 57 insertions, 44 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 083ecc93fe5e..5f1fda44882b 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -230,6 +230,8 @@ struct xenvif {
*/
bool disabled;
unsigned long status;
+ unsigned long drain_timeout;
+ unsigned long stall_timeout;
/* Queues */
struct xenvif_queue *queues;
@@ -328,7 +330,7 @@ irqreturn_t xenvif_interrupt(int irq, void *dev_id);
extern bool separate_tx_rx_irq;
extern unsigned int rx_drain_timeout_msecs;
-extern unsigned int rx_drain_timeout_jiffies;
+extern unsigned int rx_stall_timeout_msecs;
extern unsigned int xenvif_max_queues;
#ifdef CONFIG_DEBUG_FS
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 895fe84011e7..9259a732e8a4 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -166,7 +166,7 @@ static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
goto drop;
cb = XENVIF_RX_CB(skb);
- cb->expires = jiffies + rx_drain_timeout_jiffies;
+ cb->expires = jiffies + vif->drain_timeout;
xenvif_rx_queue_tail(queue, skb);
xenvif_kick_thread(queue);
@@ -235,10 +235,10 @@ static void xenvif_down(struct xenvif *vif)
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
queue = &vif->queues[queue_index];
- napi_disable(&queue->napi);
disable_irq(queue->tx_irq);
if (queue->tx_irq != queue->rx_irq)
disable_irq(queue->rx_irq);
+ napi_disable(&queue->napi);
del_timer_sync(&queue->credit_timeout);
}
}
@@ -414,6 +414,8 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
vif->ip_csum = 1;
vif->dev = dev;
vif->disabled = false;
+ vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs);
+ vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs);
/* Start out with no queues. */
vif->queues = NULL;
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 6563f0713fc0..908e65e9b821 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -60,14 +60,12 @@ module_param(separate_tx_rx_irq, bool, 0644);
*/
unsigned int rx_drain_timeout_msecs = 10000;
module_param(rx_drain_timeout_msecs, uint, 0444);
-unsigned int rx_drain_timeout_jiffies;
/* The length of time before the frontend is considered unresponsive
* because it isn't providing Rx slots.
*/
-static unsigned int rx_stall_timeout_msecs = 60000;
+unsigned int rx_stall_timeout_msecs = 60000;
module_param(rx_stall_timeout_msecs, uint, 0444);
-static unsigned int rx_stall_timeout_jiffies;
unsigned int xenvif_max_queues;
module_param_named(max_queues, xenvif_max_queues, uint, 0644);
@@ -82,6 +80,16 @@ MODULE_PARM_DESC(max_queues,
static unsigned int fatal_skb_slots = FATAL_SKB_SLOTS_DEFAULT;
module_param(fatal_skb_slots, uint, 0444);
+/* The amount to copy out of the first guest Tx slot into the skb's
+ * linear area. If the first slot has more data, it will be mapped
+ * and put into the first frag.
+ *
+ * This is sized to avoid pulling headers from the frags for most
+ * TCP/IP packets.
+ */
+#define XEN_NETBACK_TX_COPY_LEN 128
+
+
static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx,
u8 status);
@@ -125,13 +133,6 @@ static inline struct xenvif_queue *ubuf_to_queue(const struct ubuf_info *ubuf)
pending_tx_info[0]);
}
-/* This is a miniumum size for the linear area to avoid lots of
- * calls to __pskb_pull_tail() as we set up checksum offsets. The
- * value 128 was chosen as it covers all IPv4 and most likely
- * IPv6 headers.
- */
-#define PKT_PROT_LEN 128
-
static u16 frag_get_pending_idx(skb_frag_t *frag)
{
return (u16)frag->page_offset;
@@ -1446,9 +1447,9 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue,
index = pending_index(queue->pending_cons);
pending_idx = queue->pending_ring[index];
- data_len = (txreq.size > PKT_PROT_LEN &&
+ data_len = (txreq.size > XEN_NETBACK_TX_COPY_LEN &&
ret < XEN_NETBK_LEGACY_SLOTS_MAX) ?
- PKT_PROT_LEN : txreq.size;
+ XEN_NETBACK_TX_COPY_LEN : txreq.size;
skb = xenvif_alloc_skb(data_len);
if (unlikely(skb == NULL)) {
@@ -1550,7 +1551,7 @@ static int xenvif_handle_frag_list(struct xenvif_queue *queue, struct sk_buff *s
unsigned int len;
BUG_ON(i >= MAX_SKB_FRAGS);
- page = alloc_page(GFP_ATOMIC|__GFP_COLD);
+ page = alloc_page(GFP_ATOMIC);
if (!page) {
int j;
skb->truesize += skb->data_len;
@@ -1653,11 +1654,6 @@ static int xenvif_tx_submit(struct xenvif_queue *queue)
}
}
- if (skb_is_nonlinear(skb) && skb_headlen(skb) < PKT_PROT_LEN) {
- int target = min_t(int, skb->len, PKT_PROT_LEN);
- __pskb_pull_tail(skb, target - skb_headlen(skb));
- }
-
skb->dev = queue->vif->dev;
skb->protocol = eth_type_trans(skb, skb->dev);
skb_reset_network_header(skb);
@@ -2022,7 +2018,7 @@ static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue)
return !queue->stalled
&& prod - cons < XEN_NETBK_RX_SLOTS_MAX
&& time_after(jiffies,
- queue->last_rx_time + rx_stall_timeout_jiffies);
+ queue->last_rx_time + queue->vif->stall_timeout);
}
static bool xenvif_rx_queue_ready(struct xenvif_queue *queue)
@@ -2040,8 +2036,9 @@ static bool xenvif_have_rx_work(struct xenvif_queue *queue)
{
return (!skb_queue_empty(&queue->rx_queue)
&& xenvif_rx_ring_slots_available(queue, XEN_NETBK_RX_SLOTS_MAX))
- || xenvif_rx_queue_stalled(queue)
- || xenvif_rx_queue_ready(queue)
+ || (queue->vif->stall_timeout &&
+ (xenvif_rx_queue_stalled(queue)
+ || xenvif_rx_queue_ready(queue)))
|| kthread_should_stop()
|| queue->vif->disabled;
}
@@ -2094,6 +2091,9 @@ int xenvif_kthread_guest_rx(void *data)
struct xenvif_queue *queue = data;
struct xenvif *vif = queue->vif;
+ if (!vif->stall_timeout)
+ xenvif_queue_carrier_on(queue);
+
for (;;) {
xenvif_wait_for_rx_work(queue);
@@ -2120,10 +2120,12 @@ int xenvif_kthread_guest_rx(void *data)
* while it's probably not responsive, drop the
* carrier so packets are dropped earlier.
*/
- if (xenvif_rx_queue_stalled(queue))
- xenvif_queue_carrier_off(queue);
- else if (xenvif_rx_queue_ready(queue))
- xenvif_queue_carrier_on(queue);
+ if (vif->stall_timeout) {
+ if (xenvif_rx_queue_stalled(queue))
+ xenvif_queue_carrier_off(queue);
+ else if (xenvif_rx_queue_ready(queue))
+ xenvif_queue_carrier_on(queue);
+ }
/* Queued packets may have foreign pages from other
* domains. These cannot be queued indefinitely as
@@ -2194,9 +2196,6 @@ static int __init netback_init(void)
if (rc)
goto failed_init;
- rx_drain_timeout_jiffies = msecs_to_jiffies(rx_drain_timeout_msecs);
- rx_stall_timeout_jiffies = msecs_to_jiffies(rx_stall_timeout_msecs);
-
#ifdef CONFIG_DEBUG_FS
xen_netback_dbg_root = debugfs_create_dir("xen-netback", NULL);
if (IS_ERR_OR_NULL(xen_netback_dbg_root))
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 4e56a27f9689..efbaf2ae1999 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -39,7 +39,7 @@ struct backend_info {
static int connect_rings(struct backend_info *be, struct xenvif_queue *queue);
static void connect(struct backend_info *be);
static int read_xenbus_vif_flags(struct backend_info *be);
-static void backend_create_xenvif(struct backend_info *be);
+static int backend_create_xenvif(struct backend_info *be);
static void unregister_hotplug_status_watch(struct backend_info *be);
static void set_backend_state(struct backend_info *be,
enum xenbus_state state);
@@ -352,7 +352,9 @@ static int netback_probe(struct xenbus_device *dev,
be->state = XenbusStateInitWait;
/* This kicks hotplug scripts, so do it immediately. */
- backend_create_xenvif(be);
+ err = backend_create_xenvif(be);
+ if (err)
+ goto fail;
return 0;
@@ -397,30 +399,32 @@ static int netback_uevent(struct xenbus_device *xdev,
}
-static void backend_create_xenvif(struct backend_info *be)
+static int backend_create_xenvif(struct backend_info *be)
{
int err;
long handle;
struct xenbus_device *dev = be->dev;
+ struct xenvif *vif;
if (be->vif != NULL)
- return;
+ return 0;
err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle);
if (err != 1) {
xenbus_dev_fatal(dev, err, "reading handle");
- return;
+ return (err < 0) ? err : -EINVAL;
}
- be->vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
- if (IS_ERR(be->vif)) {
- err = PTR_ERR(be->vif);
- be->vif = NULL;
+ vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
+ if (IS_ERR(vif)) {
+ err = PTR_ERR(vif);
xenbus_dev_fatal(dev, err, "creating interface");
- return;
+ return err;
}
+ be->vif = vif;
kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE);
+ return 0;
}
static void backend_disconnect(struct backend_info *be)
@@ -883,9 +887,15 @@ static int read_xenbus_vif_flags(struct backend_info *be)
return -EOPNOTSUPP;
if (xenbus_scanf(XBT_NIL, dev->otherend,
- "feature-rx-notify", "%d", &val) < 0 || val == 0) {
- xenbus_dev_fatal(dev, -EINVAL, "feature-rx-notify is mandatory");
- return -EINVAL;
+ "feature-rx-notify", "%d", &val) < 0)
+ val = 0;
+ if (!val) {
+ /* - Reduce drain timeout to poll more frequently for
+ * Rx requests.
+ * - Disable Rx stall detection.
+ */
+ be->vif->drain_timeout = msecs_to_jiffies(30);
+ be->vif->stall_timeout = 0;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-05 12:24:44 +0300