[PATCH 1/1] forcedeth: remove tx_stop variable

Subsystems: forcedeth gigabit ethernet driver, networking drivers, the rest

STALE3275d

2 messages, 1 author, 2017-09-14 · open the first message on its own page

[PATCH 1/1] forcedeth: remove tx_stop variable

From: Zhu Yanjun <hidden>
Date: 2017-09-08 12:26:21 

The variable tx_stop is used to indicate the tx queue state: started
or stopped. In fact, the inline function netif_queue_stopped can do
the same work. So replace the variable tx_stop with the
function netif_queue_stopped.

Signed-off-by: Zhu Yanjun <redacted>
---
 drivers/net/ethernet/nvidia/forcedeth.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index 994a83a..e6e0de4 100644
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -834,7 +834,6 @@ struct fe_priv {
 	u32 tx_pkts_in_progress;
 	struct nv_skb_map *tx_change_owner;
 	struct nv_skb_map *tx_end_flip;
-	int tx_stop;
 
 	/* TX software stats */
 	struct u64_stats_sync swstats_tx_syncp;
@@ -1939,7 +1938,6 @@ static void nv_init_tx(struct net_device *dev)
 	np->tx_pkts_in_progress = 0;
 	np->tx_change_owner = NULL;
 	np->tx_end_flip = NULL;
-	np->tx_stop = 0;
 
 	for (i = 0; i < np->tx_ring_size; i++) {
 		if (!nv_optimized(np)) {
@@ -2211,7 +2209,6 @@ static netdev_tx_t nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	empty_slots = nv_get_empty_tx_slots(np);
 	if (unlikely(empty_slots <= entries)) {
 		netif_stop_queue(dev);
-		np->tx_stop = 1;
 		spin_unlock_irqrestore(&np->lock, flags);
 		return NETDEV_TX_BUSY;
 	}
@@ -2359,7 +2356,6 @@ static netdev_tx_t nv_start_xmit_optimized(struct sk_buff *skb,
 	empty_slots = nv_get_empty_tx_slots(np);
 	if (unlikely(empty_slots <= entries)) {
 		netif_stop_queue(dev);
-		np->tx_stop = 1;
 		spin_unlock_irqrestore(&np->lock, flags);
 		return NETDEV_TX_BUSY;
 	}
@@ -2583,8 +2579,8 @@ static int nv_tx_done(struct net_device *dev, int limit)
 
 	netdev_completed_queue(np->dev, tx_work, bytes_compl);
 
-	if (unlikely((np->tx_stop == 1) && (np->get_tx.orig != orig_get_tx))) {
-		np->tx_stop = 0;
+	if (unlikely(netif_queue_stopped(dev) &&
+		     (np->get_tx.orig != orig_get_tx))) {
 		netif_wake_queue(dev);
 	}
 	return tx_work;
@@ -2637,8 +2633,8 @@ static int nv_tx_done_optimized(struct net_device *dev, int limit)
 
 	netdev_completed_queue(np->dev, tx_work, bytes_cleaned);
 
-	if (unlikely((np->tx_stop == 1) && (np->get_tx.ex != orig_get_tx))) {
-		np->tx_stop = 0;
+	if (unlikely(netif_queue_stopped(dev) &&
+		     (np->get_tx.ex != orig_get_tx))) {
 		netif_wake_queue(dev);
 	}
 	return tx_work;
@@ -2724,7 +2720,6 @@ static void nv_tx_timeout(struct net_device *dev)
 	/* 2) complete any outstanding tx and do not give HW any limited tx pkts */
 	saved_tx_limit = np->tx_limit;
 	np->tx_limit = 0; /* prevent giving HW any limited pkts */
-	np->tx_stop = 0;  /* prevent waking tx queue */
 	if (!nv_optimized(np))
 		nv_tx_done(dev, np->tx_ring_size);
 	else
-- 
2.7.4

Re: [PATCH 1/1] forcedeth: remove tx_stop variable

From: Yanjun Zhu <hidden>
Date: 2017-09-14 07:54:37 

Hi, all

After this patch is applied, the TCP && UDP tests are made.

The TCP bandwidth is 939 Mbits/sec. The UDP bandwidth is 806 Mbits/sec.

So I think this patch can work well.

host1 <-----> host2

host1: forcedeth NIC
IP: 1.1.1.107
iperf -s

host2: forcedeth NIC
IP:1.1.1.105
iperf -c 1.1.1.107

The TCP Bandwidth is as below:
------------------------------------------------------------
Client connecting to 1.1.1.107, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 1.1.1.105 port 46092 connected with 1.1.1.107 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.09 GBytes   939 Mbits/sec

The UDP is as below:

iperf -c 1.1.1.107 -u -b 1000m
------------------------------------------------------------
Client connecting to 1.1.1.107, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 1.1.1.105 port 47265 connected with 1.1.1.107 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   964 MBytes   809 Mbits/sec
[  3] Sent 687990 datagrams
[  3] Server Report:
[  3]  0.0-10.0 sec   960 MBytes   806 Mbits/sec   0.019 ms 2942/687989 
(0.43%)
[  3]  0.0-10.0 sec  1 datagrams received out-of-order

Zhu Yanjun

On 2017/9/8 20:28, Zhu Yanjun wrote:
quoted hunk
The variable tx_stop is used to indicate the tx queue state: started
or stopped. In fact, the inline function netif_queue_stopped can do
the same work. So replace the variable tx_stop with the
function netif_queue_stopped.

Signed-off-by: Zhu Yanjun <redacted>
---
  drivers/net/ethernet/nvidia/forcedeth.c | 13 ++++---------
  1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index 994a83a..e6e0de4 100644
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -834,7 +834,6 @@ struct fe_priv {
  	u32 tx_pkts_in_progress;
  	struct nv_skb_map *tx_change_owner;
  	struct nv_skb_map *tx_end_flip;
-	int tx_stop;
  
  	/* TX software stats */
  	struct u64_stats_sync swstats_tx_syncp;
@@ -1939,7 +1938,6 @@ static void nv_init_tx(struct net_device *dev)
  	np->tx_pkts_in_progress = 0;
  	np->tx_change_owner = NULL;
  	np->tx_end_flip = NULL;
-	np->tx_stop = 0;
  
  	for (i = 0; i < np->tx_ring_size; i++) {
  		if (!nv_optimized(np)) {
@@ -2211,7 +2209,6 @@ static netdev_tx_t nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
  	empty_slots = nv_get_empty_tx_slots(np);
  	if (unlikely(empty_slots <= entries)) {
  		netif_stop_queue(dev);
-		np->tx_stop = 1;
  		spin_unlock_irqrestore(&np->lock, flags);
  		return NETDEV_TX_BUSY;
  	}
@@ -2359,7 +2356,6 @@ static netdev_tx_t nv_start_xmit_optimized(struct sk_buff *skb,
  	empty_slots = nv_get_empty_tx_slots(np);
  	if (unlikely(empty_slots <= entries)) {
  		netif_stop_queue(dev);
-		np->tx_stop = 1;
  		spin_unlock_irqrestore(&np->lock, flags);
  		return NETDEV_TX_BUSY;
  	}
@@ -2583,8 +2579,8 @@ static int nv_tx_done(struct net_device *dev, int limit)
  
  	netdev_completed_queue(np->dev, tx_work, bytes_compl);
  
-	if (unlikely((np->tx_stop == 1) && (np->get_tx.orig != orig_get_tx))) {
-		np->tx_stop = 0;
+	if (unlikely(netif_queue_stopped(dev) &&
+		     (np->get_tx.orig != orig_get_tx))) {
  		netif_wake_queue(dev);
  	}
  	return tx_work;
@@ -2637,8 +2633,8 @@ static int nv_tx_done_optimized(struct net_device *dev, int limit)
  
  	netdev_completed_queue(np->dev, tx_work, bytes_cleaned);
  
-	if (unlikely((np->tx_stop == 1) && (np->get_tx.ex != orig_get_tx))) {
-		np->tx_stop = 0;
+	if (unlikely(netif_queue_stopped(dev) &&
+		     (np->get_tx.ex != orig_get_tx))) {
  		netif_wake_queue(dev);
  	}
  	return tx_work;
@@ -2724,7 +2720,6 @@ static void nv_tx_timeout(struct net_device *dev)
  	/* 2) complete any outstanding tx and do not give HW any limited tx pkts */
  	saved_tx_limit = np->tx_limit;
  	np->tx_limit = 0; /* prevent giving HW any limited pkts */
-	np->tx_stop = 0;  /* prevent waking tx queue */
  	if (!nv_optimized(np))
  		nv_tx_done(dev, np->tx_ring_size);
  	else
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help