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authorRajesh Borundia <rajesh.borundia@qlogic.com>2010-10-18 02:03:41 +0000
committerDavid S. Miller <davem@davemloft.net>2010-10-18 07:22:51 -0700
commit7a9905e64272c8021a8cfaf6015dd0fb8eeeb378 (patch)
tree085ccb214fcc14dd2589516bba768a7c23fcef0a
parent3666e0b04f092f9d9da8a6d6a3820de6c870407c (diff)
netxen: fix race in tx stop queue
There is race between netif_stop_queue and netif_stopped_queue check.So check once again if buffers are available to avoid race. With above logic we can also get rid of tx lock in process_cmd_ring. Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com> Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/netxen/netxen_nic.h5
-rw-r--r--drivers/net/netxen/netxen_nic_hw.c10
-rw-r--r--drivers/net/netxen/netxen_nic_init.c10
-rw-r--r--drivers/net/netxen/netxen_nic_main.c15
4 files changed, 22 insertions, 18 deletions
diff --git a/drivers/net/netxen/netxen_nic.h b/drivers/net/netxen/netxen_nic.h
index 6dca3574e35..92f89af0720 100644
--- a/drivers/net/netxen/netxen_nic.h
+++ b/drivers/net/netxen/netxen_nic.h
@@ -175,7 +175,10 @@
#define MAX_NUM_CARDS 4
#define MAX_BUFFERS_PER_CMD 32
-#define TX_STOP_THRESH ((MAX_SKB_FRAGS >> 2) + 4)
+#define MAX_TSO_HEADER_DESC 2
+#define MGMT_CMD_DESC_RESV 4
+#define TX_STOP_THRESH ((MAX_SKB_FRAGS >> 2) + MAX_TSO_HEADER_DESC \
+ + MGMT_CMD_DESC_RESV)
#define NX_MAX_TX_TIMEOUTS 2
/*
diff --git a/drivers/net/netxen/netxen_nic_hw.c b/drivers/net/netxen/netxen_nic_hw.c
index 29d7b93d049..10e2f13d890 100644
--- a/drivers/net/netxen/netxen_nic_hw.c
+++ b/drivers/net/netxen/netxen_nic_hw.c
@@ -598,8 +598,14 @@ netxen_send_cmd_descs(struct netxen_adapter *adapter,
if (nr_desc >= netxen_tx_avail(tx_ring)) {
netif_tx_stop_queue(tx_ring->txq);
- __netif_tx_unlock_bh(tx_ring->txq);
- return -EBUSY;
+ smp_mb();
+ if (netxen_tx_avail(tx_ring) > nr_desc) {
+ if (netxen_tx_avail(tx_ring) > TX_STOP_THRESH)
+ netif_tx_wake_queue(tx_ring->txq);
+ } else {
+ __netif_tx_unlock_bh(tx_ring->txq);
+ return -EBUSY;
+ }
}
do {
diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c
index a2d805aa75c..95fe552aa27 100644
--- a/drivers/net/netxen/netxen_nic_init.c
+++ b/drivers/net/netxen/netxen_nic_init.c
@@ -1763,14 +1763,10 @@ int netxen_process_cmd_ring(struct netxen_adapter *adapter)
smp_mb();
- if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev)) {
- __netif_tx_lock(tx_ring->txq, smp_processor_id());
- if (netxen_tx_avail(tx_ring) > TX_STOP_THRESH) {
+ if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev))
+ if (netxen_tx_avail(tx_ring) > TX_STOP_THRESH)
netif_wake_queue(netdev);
- adapter->tx_timeo_cnt = 0;
- }
- __netif_tx_unlock(tx_ring->txq);
- }
+ adapter->tx_timeo_cnt = 0;
}
/*
* If everything is freed up to consumer then check if the ring is full
diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 2c6ceeb592b..83ee5544ace 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -125,11 +125,6 @@ netxen_nic_update_cmd_producer(struct netxen_adapter *adapter,
struct nx_host_tx_ring *tx_ring)
{
NXWRIO(adapter, tx_ring->crb_cmd_producer, tx_ring->producer);
-
- if (netxen_tx_avail(tx_ring) <= TX_STOP_THRESH) {
- netif_stop_queue(adapter->netdev);
- smp_mb();
- }
}
static uint32_t crb_cmd_consumer[4] = {
@@ -1209,7 +1204,7 @@ netxen_setup_netdev(struct netxen_adapter *adapter,
adapter->max_mc_count = 16;
netdev->netdev_ops = &netxen_netdev_ops;
- netdev->watchdog_timeo = 2*HZ;
+ netdev->watchdog_timeo = 5*HZ;
netxen_nic_change_mtu(netdev, netdev->mtu);
@@ -1825,9 +1820,13 @@ netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
/* 4 fragments per cmd des */
no_of_desc = (frag_count + 3) >> 2;
- if (unlikely(no_of_desc + 2 > netxen_tx_avail(tx_ring))) {
+ if (unlikely(netxen_tx_avail(tx_ring) <= TX_STOP_THRESH)) {
netif_stop_queue(netdev);
- return NETDEV_TX_BUSY;
+ smp_mb();
+ if (netxen_tx_avail(tx_ring) > TX_STOP_THRESH)
+ netif_start_queue(netdev);
+ else
+ return NETDEV_TX_BUSY;
}
producer = tx_ring->producer;