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Date: Mon, 26 Sep 2011 17:11:03 -0300
From: brenohl@...ibm.com
To: eric.dumazet@...il.com
Cc: davem@...emloft.net, netdev@...r.kernel.org,
Breno Leitao <brenohl@...ibm.com>
Subject: [PATCH] ehea: Remove sleep at .ndo_get_stats
Currently ehea ndo_get_stats can sleep in two places, in a hcall
and in a GFP_KERNEL alloc, which is not correct.
This patch creates a delayed workqueue that grabs the information each 1
sec from the hardware, and place it into the device structure, so that,
.ndo_get_stats quickly returns the device structure statistics block.
Signed-off-by: Breno Leitao <brenohl@...ibm.com>
---
drivers/net/ethernet/ibm/ehea/ehea.h | 1 +
drivers/net/ethernet/ibm/ehea/ehea_main.c | 59 +++++++++++++++++-----------
2 files changed, 37 insertions(+), 23 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ehea/ehea.h b/drivers/net/ethernet/ibm/ehea/ehea.h
index 7dd5e6a..0b8e6a9 100644
--- a/drivers/net/ethernet/ibm/ehea/ehea.h
+++ b/drivers/net/ethernet/ibm/ehea/ehea.h
@@ -459,6 +459,7 @@ struct ehea_port {
struct ehea_mc_list *mc_list; /* Multicast MAC addresses */
struct ehea_eq *qp_eq;
struct work_struct reset_task;
+ struct delayed_work stats_work;
struct mutex port_lock;
char int_aff_name[EHEA_IRQ_NAME_SIZE];
int allmulti; /* Indicates IFF_ALLMULTI state */
diff --git a/drivers/net/ethernet/ibm/ehea/ehea_main.c b/drivers/net/ethernet/ibm/ehea/ehea_main.c
index 583bcd3..c821cb6 100644
--- a/drivers/net/ethernet/ibm/ehea/ehea_main.c
+++ b/drivers/net/ethernet/ibm/ehea/ehea_main.c
@@ -331,16 +331,40 @@ static struct net_device_stats *ehea_get_stats(struct net_device *dev)
{
struct ehea_port *port = netdev_priv(dev);
struct net_device_stats *stats = &port->stats;
- struct hcp_ehea_port_cb2 *cb2;
- u64 hret, rx_packets, tx_packets, rx_bytes = 0, tx_bytes = 0;
+ u64 rx_packets = 0, tx_packets = 0, rx_bytes = 0, tx_bytes = 0;
int i;
- memset(stats, 0, sizeof(*stats));
+ for (i = 0; i < port->num_def_qps; i++) {
+ rx_packets += port->port_res[i].rx_packets;
+ rx_bytes += port->port_res[i].rx_bytes;
+ }
+
+ for (i = 0; i < port->num_def_qps + port->num_add_tx_qps; i++) {
+ tx_packets += port->port_res[i].tx_packets;
+ tx_bytes += port->port_res[i].tx_bytes;
+ }
+
+ stats->tx_packets = tx_packets;
+ stats->rx_bytes = rx_bytes;
+ stats->tx_bytes = tx_bytes;
+ stats->rx_packets = rx_packets;
+
+ return &port->stats;
+}
+
+static void ehea_update_stats(struct work_struct *work)
+{
+ struct ehea_port *port =
+ container_of(work, struct ehea_port, stats_work.work);
+ struct net_device *dev = port->netdev;
+ struct net_device_stats *stats = &port->stats;
+ struct hcp_ehea_port_cb2 *cb2;
+ u64 hret;
cb2 = (void *)get_zeroed_page(GFP_KERNEL);
if (!cb2) {
- netdev_err(dev, "no mem for cb2\n");
- goto out;
+ netdev_err(dev, "No mem for cb2. Some interface statistics were not updated\n");
+ goto resched;
}
hret = ehea_h_query_ehea_port(port->adapter->handle,
@@ -354,29 +378,13 @@ static struct net_device_stats *ehea_get_stats(struct net_device *dev)
if (netif_msg_hw(port))
ehea_dump(cb2, sizeof(*cb2), "net_device_stats");
- rx_packets = 0;
- for (i = 0; i < port->num_def_qps; i++) {
- rx_packets += port->port_res[i].rx_packets;
- rx_bytes += port->port_res[i].rx_bytes;
- }
-
- tx_packets = 0;
- for (i = 0; i < port->num_def_qps + port->num_add_tx_qps; i++) {
- tx_packets += port->port_res[i].tx_packets;
- tx_bytes += port->port_res[i].tx_bytes;
- }
-
- stats->tx_packets = tx_packets;
stats->multicast = cb2->rxmcp;
stats->rx_errors = cb2->rxuerr;
- stats->rx_bytes = rx_bytes;
- stats->tx_bytes = tx_bytes;
- stats->rx_packets = rx_packets;
out_herr:
free_page((unsigned long)cb2);
-out:
- return stats;
+resched:
+ schedule_delayed_work(&port->stats_work, msecs_to_jiffies(1000));
}
static void ehea_refill_rq1(struct ehea_port_res *pr, int index, int nr_of_wqes)
@@ -2651,6 +2659,7 @@ static int ehea_open(struct net_device *dev)
}
mutex_unlock(&port->port_lock);
+ schedule_delayed_work(&port->stats_work, msecs_to_jiffies(1000));
return ret;
}
@@ -2690,6 +2699,7 @@ static int ehea_stop(struct net_device *dev)
set_bit(__EHEA_DISABLE_PORT_RESET, &port->flags);
cancel_work_sync(&port->reset_task);
+ cancel_delayed_work_sync(&port->stats_work);
mutex_lock(&port->port_lock);
netif_stop_queue(dev);
port_napi_disable(port);
@@ -3235,10 +3245,12 @@ struct ehea_port *ehea_setup_single_port(struct ehea_adapter *adapter,
dev->features |= NETIF_F_LRO;
INIT_WORK(&port->reset_task, ehea_reset_port);
+ INIT_DELAYED_WORK(&port->stats_work, ehea_update_stats);
init_waitqueue_head(&port->swqe_avail_wq);
init_waitqueue_head(&port->restart_wq);
+ memset(&port->stats, 0, sizeof(struct net_device_stats));
ret = register_netdev(dev);
if (ret) {
pr_err("register_netdev failed. ret=%d\n", ret);
@@ -3278,6 +3290,7 @@ static void ehea_shutdown_single_port(struct ehea_port *port)
struct ehea_adapter *adapter = port->adapter;
cancel_work_sync(&port->reset_task);
+ cancel_delayed_work_sync(&port->stats_work);
unregister_netdev(port->netdev);
ehea_unregister_port(port);
kfree(port->mc_list);
--
1.7.1
--
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