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Date: Mon, 15 Feb 2010 12:13:17 -0800
From: David Daney <ddaney@...iumnetworks.com>
To: ralf@...ux-mips.org, linux-mips@...ux-mips.org,
netdev@...r.kernel.org, gregkh@...e.de
Cc: David Daney <ddaney@...iumnetworks.com>
Subject: [PATCH 2/4] Staging: Octeon: Run phy bus accesses on a workqueue.
When directly accessing a phy, we must acquire the mdio bus lock. To
do that we cannot be in interrupt context, so we need to move these
operations to a workqueue.
Signed-off-by: David Daney <ddaney@...iumnetworks.com>
---
drivers/staging/octeon/ethernet-rgmii.c | 55 +++++++++++----
drivers/staging/octeon/ethernet.c | 113 +++++++++++++++++-------------
drivers/staging/octeon/octeon-ethernet.h | 4 +
3 files changed, 109 insertions(+), 63 deletions(-)
diff --git a/drivers/staging/octeon/ethernet-rgmii.c b/drivers/staging/octeon/ethernet-rgmii.c
index f90d46e..a0d4d4b 100644
--- a/drivers/staging/octeon/ethernet-rgmii.c
+++ b/drivers/staging/octeon/ethernet-rgmii.c
@@ -26,6 +26,7 @@
**********************************************************************/
#include <linux/kernel.h>
#include <linux/netdevice.h>
+#include <linux/phy.h>
#include <net/dst.h>
#include <asm/octeon/octeon.h>
@@ -47,14 +48,20 @@ static int number_rgmii_ports;
static void cvm_oct_rgmii_poll(struct net_device *dev)
{
struct octeon_ethernet *priv = netdev_priv(dev);
- unsigned long flags;
+ unsigned long flags = 0;
cvmx_helper_link_info_t link_info;
+ int use_global_register_lock = (priv->phydev == NULL);
- /*
- * Take the global register lock since we are going to touch
- * registers that affect more than one port.
- */
- spin_lock_irqsave(&global_register_lock, flags);
+ BUG_ON(in_interrupt());
+ if (use_global_register_lock) {
+ /*
+ * Take the global register lock since we are going to
+ * touch registers that affect more than one port.
+ */
+ spin_lock_irqsave(&global_register_lock, flags);
+ } else {
+ mutex_lock(&priv->phydev->bus->mdio_lock);
+ }
link_info = cvmx_helper_link_get(priv->port);
if (link_info.u64 == priv->link_info) {
@@ -114,7 +121,11 @@ static void cvm_oct_rgmii_poll(struct net_device *dev)
dev->name);
}
}
- spin_unlock_irqrestore(&global_register_lock, flags);
+
+ if (use_global_register_lock)
+ spin_unlock_irqrestore(&global_register_lock, flags);
+ else
+ mutex_unlock(&priv->phydev->bus->mdio_lock);
return;
}
@@ -150,7 +161,12 @@ static void cvm_oct_rgmii_poll(struct net_device *dev)
link_info = cvmx_helper_link_autoconf(priv->port);
priv->link_info = link_info.u64;
}
- spin_unlock_irqrestore(&global_register_lock, flags);
+
+ if (use_global_register_lock)
+ spin_unlock_irqrestore(&global_register_lock, flags);
+ else {
+ mutex_unlock(&priv->phydev->bus->mdio_lock);
+ }
if (priv->phydev == NULL) {
/* Tell core. */
@@ -212,8 +228,11 @@ static irqreturn_t cvm_oct_rgmii_rml_interrupt(int cpl, void *dev_id)
struct net_device *dev =
cvm_oct_device[cvmx_helper_get_ipd_port
(interface, index)];
- if (dev)
- cvm_oct_rgmii_poll(dev);
+ struct octeon_ethernet *priv = netdev_priv(dev);
+
+ if (dev && !atomic_read(&cvm_oct_poll_queue_stopping))
+ queue_work(cvm_oct_poll_queue, &priv->port_work);
+
gmx_rx_int_reg.u64 = 0;
gmx_rx_int_reg.s.phy_dupx = 1;
gmx_rx_int_reg.s.phy_link = 1;
@@ -251,8 +270,11 @@ static irqreturn_t cvm_oct_rgmii_rml_interrupt(int cpl, void *dev_id)
struct net_device *dev =
cvm_oct_device[cvmx_helper_get_ipd_port
(interface, index)];
- if (dev)
- cvm_oct_rgmii_poll(dev);
+ struct octeon_ethernet *priv = netdev_priv(dev);
+
+ if (dev && !atomic_read(&cvm_oct_poll_queue_stopping))
+ queue_work(cvm_oct_poll_queue, &priv->port_work);
+
gmx_rx_int_reg.u64 = 0;
gmx_rx_int_reg.s.phy_dupx = 1;
gmx_rx_int_reg.s.phy_link = 1;
@@ -301,6 +323,12 @@ int cvm_oct_rgmii_stop(struct net_device *dev)
return 0;
}
+static void cvm_oct_rgmii_immediate_poll(struct work_struct *work)
+{
+ struct octeon_ethernet *priv = container_of(work, struct octeon_ethernet, port_work);
+ cvm_oct_rgmii_poll(cvm_oct_device[priv->port]);
+}
+
int cvm_oct_rgmii_init(struct net_device *dev)
{
struct octeon_ethernet *priv = netdev_priv(dev);
@@ -308,7 +336,7 @@ int cvm_oct_rgmii_init(struct net_device *dev)
cvm_oct_common_init(dev);
dev->netdev_ops->ndo_stop(dev);
-
+ INIT_WORK(&priv->port_work, cvm_oct_rgmii_immediate_poll);
/*
* Due to GMX errata in CN3XXX series chips, it is necessary
* to take the link down immediately when the PHY changes
@@ -396,4 +424,5 @@ void cvm_oct_rgmii_uninit(struct net_device *dev)
number_rgmii_ports--;
if (number_rgmii_ports == 0)
free_irq(OCTEON_IRQ_RML, &number_rgmii_ports);
+ cancel_work_sync(&priv->port_work);
}
diff --git a/drivers/staging/octeon/ethernet.c b/drivers/staging/octeon/ethernet.c
index 5afece0..1771c10 100644
--- a/drivers/staging/octeon/ethernet.c
+++ b/drivers/staging/octeon/ethernet.c
@@ -123,9 +123,16 @@ MODULE_PARM_DESC(rx_napi_weight, "The NAPI WEIGHT parameter.");
static unsigned int cvm_oct_mac_addr_offset;
/**
- * Periodic timer to check auto negotiation
+ * cvm_oct_poll_queue - Workqueue for polling operations.
*/
-static struct timer_list cvm_oct_poll_timer;
+struct workqueue_struct *cvm_oct_poll_queue;
+
+/**
+ * cvm_oct_poll_queue_stopping - flag to indicate polling should stop.
+ *
+ * Set to one right before cvm_oct_poll_queue is destroyed.
+ */
+atomic_t cvm_oct_poll_queue_stopping = ATOMIC_INIT(0);
/**
* Array of every ethernet device owned by this driver indexed by
@@ -133,47 +140,39 @@ static struct timer_list cvm_oct_poll_timer;
*/
struct net_device *cvm_oct_device[TOTAL_NUMBER_OF_PORTS];
-/**
- * Periodic timer tick for slow management operations
- *
- * @arg: Device to check
- */
-static void cvm_do_timer(unsigned long arg)
+static void cvm_oct_rx_refill_worker(struct work_struct *work);
+static DECLARE_DELAYED_WORK(cvm_oct_rx_refill_work, cvm_oct_rx_refill_worker);
+
+static void cvm_oct_rx_refill_worker(struct work_struct *work)
{
- static int port;
- if (port < CVMX_PIP_NUM_INPUT_PORTS) {
- if (cvm_oct_device[port]) {
- struct octeon_ethernet *priv = netdev_priv(cvm_oct_device[port]);
- if (priv->poll)
- priv->poll(cvm_oct_device[port]);
- cvm_oct_free_tx_skbs(priv);
- cvm_oct_device[port]->netdev_ops->ndo_get_stats(cvm_oct_device[port]);
- }
- port++;
- /*
- * Poll the next port in a 50th of a second. This
- * spreads the polling of ports out a little bit.
- */
- mod_timer(&cvm_oct_poll_timer, jiffies + HZ/50);
- } else {
- port = 0;
- /*
- * FPA 0 may have been drained, try to refill it if we
- * need more than num_packet_buffers / 2, otherwise
- * normal receive processing will refill it. If it
- * were drained, no packets could be received so
- * cvm_oct_napi_poll would never be invoked to do the
- * refill.
- */
- cvm_oct_rx_refill_pool(num_packet_buffers / 2);
- /*
- * All ports have been polled. Start the next iteration through
- * the ports in one second.
- */
- mod_timer(&cvm_oct_poll_timer, jiffies + HZ);
- }
+ /*
+ * FPA 0 may have been drained, try to refill it if we need
+ * more than num_packet_buffers / 2, otherwise normal receive
+ * processing will refill it. If it were drained, no packets
+ * could be received so cvm_oct_napi_poll would never be
+ * invoked to do the refill.
+ */
+ cvm_oct_rx_refill_pool(num_packet_buffers / 2);
+
+ if (!atomic_read(&cvm_oct_poll_queue_stopping))
+ queue_delayed_work(cvm_oct_poll_queue,
+ &cvm_oct_rx_refill_work, HZ);
}
+static void cvm_oct_tx_clean_worker(struct work_struct *work)
+{
+ struct octeon_ethernet *priv = container_of(work,
+ struct octeon_ethernet,
+ tx_clean_work.work);
+
+ if (priv->poll)
+ priv->poll(cvm_oct_device[priv->port]);
+ cvm_oct_free_tx_skbs(priv);
+ cvm_oct_device[priv->port]->netdev_ops->ndo_get_stats(cvm_oct_device[priv->port]);
+ if (!atomic_read(&cvm_oct_poll_queue_stopping))
+ queue_delayed_work(cvm_oct_poll_queue, &priv->tx_clean_work, HZ);
+ }
+
/**
* Configure common hardware for all interfaces
*/
@@ -624,6 +623,12 @@ static int __init cvm_oct_init_module(void)
else
cvm_oct_mac_addr_offset = 0;
+ cvm_oct_poll_queue = create_singlethread_workqueue("octeon-ethernet");
+ if (cvm_oct_poll_queue == NULL) {
+ pr_err("octeon-ethernet: Cannot create workqueue");
+ return -ENOMEM;
+ }
+
cvm_oct_proc_initialize();
cvm_oct_configure_common_hw();
@@ -719,7 +724,9 @@ static int __init cvm_oct_init_module(void)
/* Initialize the device private structure. */
priv = netdev_priv(dev);
- memset(priv, 0, sizeof(struct octeon_ethernet));
+
+ INIT_DELAYED_WORK(&priv->tx_clean_work,
+ cvm_oct_tx_clean_worker);
priv->imode = imode;
priv->port = port;
@@ -785,17 +792,15 @@ static int __init cvm_oct_init_module(void)
fau -=
cvmx_pko_get_num_queues(priv->port) *
sizeof(uint32_t);
+ queue_delayed_work(cvm_oct_poll_queue,
+ &priv->tx_clean_work, HZ);
}
}
}
cvm_oct_rx_initialize();
- /* Enable the poll timer for checking RGMII status */
- init_timer(&cvm_oct_poll_timer);
- cvm_oct_poll_timer.data = 0;
- cvm_oct_poll_timer.function = cvm_do_timer;
- mod_timer(&cvm_oct_poll_timer, jiffies + HZ);
+ queue_delayed_work(cvm_oct_poll_queue, &cvm_oct_rx_refill_work, HZ);
return 0;
}
@@ -817,20 +822,28 @@ static void __exit cvm_oct_cleanup_module(void)
/* Free the interrupt handler */
free_irq(OCTEON_IRQ_WORKQ0 + pow_receive_group, cvm_oct_device);
- del_timer(&cvm_oct_poll_timer);
+ atomic_inc_return(&cvm_oct_poll_queue_stopping);
+ cancel_delayed_work_sync(&cvm_oct_rx_refill_work);
+
cvm_oct_rx_shutdown();
cvmx_pko_disable();
/* Free the ethernet devices */
for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
if (cvm_oct_device[port]) {
- cvm_oct_tx_shutdown(cvm_oct_device[port]);
- unregister_netdev(cvm_oct_device[port]);
- kfree(cvm_oct_device[port]);
+ struct net_device *dev = cvm_oct_device[port];
+ struct octeon_ethernet *priv = netdev_priv(dev);
+ cancel_delayed_work_sync(&priv->tx_clean_work);
+
+ cvm_oct_tx_shutdown(dev);
+ unregister_netdev(dev);
+ kfree(dev);
cvm_oct_device[port] = NULL;
}
}
+ destroy_workqueue(cvm_oct_poll_queue);
+
cvmx_pko_shutdown();
cvm_oct_proc_shutdown();
diff --git a/drivers/staging/octeon/octeon-ethernet.h b/drivers/staging/octeon/octeon-ethernet.h
index 40b6956..8d09210 100644
--- a/drivers/staging/octeon/octeon-ethernet.h
+++ b/drivers/staging/octeon/octeon-ethernet.h
@@ -61,6 +61,8 @@ struct octeon_ethernet {
void (*poll) (struct net_device *dev);
struct hrtimer tx_restart_timer;
ktime_t tx_restart_interval;
+ struct delayed_work tx_clean_work;
+ struct work_struct port_work; /* may be unused. */
};
/**
@@ -97,6 +99,8 @@ extern int pow_send_group;
extern int pow_receive_group;
extern char pow_send_list[];
extern struct net_device *cvm_oct_device[];
+extern struct workqueue_struct *cvm_oct_poll_queue;
+extern atomic_t cvm_oct_poll_queue_stopping;
extern int max_rx_cpus;
extern int rx_napi_weight;
--
1.6.6
--
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