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Date: Mon, 25 Apr 2011 21:38:13 -0700 (PDT)
From: Tom Herbert <therbert@...gle.com>
To: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 3/3] forcedeth: Support for byte queue limits
Changes to forcedeth to use byte queue limits.
Signed-off-by: Tom Herbert <therbert@...gle.com>
---
drivers/net/forcedeth.c | 38 ++++++++++++++++++++++++++++++++++----
1 files changed, 34 insertions(+), 4 deletions(-)
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index 0e1c76a..00f9f99 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -1827,6 +1827,11 @@ static void nv_init_rx(struct net_device *dev)
}
}
+static struct netdev_queue *nv_netdev_queue(struct fe_priv *np)
+{
+ return netdev_get_tx_queue(np->dev, 0);
+}
+
static void nv_init_tx(struct net_device *dev)
{
struct fe_priv *np = netdev_priv(dev);
@@ -1843,6 +1848,7 @@ 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;
+ netdev_queue_bql_reset(nv_netdev_queue(np));
np->tx_stop = 0;
for (i = 0; i < np->tx_ring_size; i++) {
@@ -2107,7 +2113,8 @@ static netdev_tx_t nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
spin_lock_irqsave(&np->lock, flags);
empty_slots = nv_get_empty_tx_slots(np);
- if (unlikely(empty_slots <= entries)) {
+ if (unlikely(empty_slots <= entries ||
+ !netdev_queue_bytes_avail(nv_netdev_queue(np)))) {
netif_stop_queue(dev);
np->tx_stop = 1;
spin_unlock_irqrestore(&np->lock, flags);
@@ -2180,6 +2187,9 @@ static netdev_tx_t nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* set tx flags */
start_tx->flaglen |= cpu_to_le32(tx_flags | tx_flags_extra);
+
+ netdev_queue_bytes_sent(nv_netdev_queue(np), skb->len);
+
np->put_tx.orig = put_tx;
spin_unlock_irqrestore(&np->lock, flags);
@@ -2216,7 +2226,8 @@ static netdev_tx_t nv_start_xmit_optimized(struct sk_buff *skb,
spin_lock_irqsave(&np->lock, flags);
empty_slots = nv_get_empty_tx_slots(np);
- if (unlikely(empty_slots <= entries)) {
+ if (unlikely(empty_slots <= entries ||
+ !netdev_queue_bytes_avail(nv_netdev_queue(np)))) {
netif_stop_queue(dev);
np->tx_stop = 1;
spin_unlock_irqrestore(&np->lock, flags);
@@ -2319,6 +2330,9 @@ static netdev_tx_t nv_start_xmit_optimized(struct sk_buff *skb,
/* set tx flags */
start_tx->flaglen |= cpu_to_le32(tx_flags | tx_flags_extra);
+
+ netdev_queue_bytes_sent(nv_netdev_queue(np), skb->len);
+
np->put_tx.ex = put_tx;
spin_unlock_irqrestore(&np->lock, flags);
@@ -2356,6 +2370,7 @@ static int nv_tx_done(struct net_device *dev, int limit)
u32 flags;
int tx_work = 0;
struct ring_desc *orig_get_tx = np->get_tx.orig;
+ unsigned long bytes_cleaned = 0;
while ((np->get_tx.orig != np->put_tx.orig) &&
!((flags = le32_to_cpu(np->get_tx.orig->flaglen)) & NV_TX_VALID) &&
@@ -2395,6 +2410,7 @@ static int nv_tx_done(struct net_device *dev, int limit)
dev->stats.tx_packets++;
dev->stats.tx_bytes += np->get_tx_ctx->skb->len;
}
+ bytes_cleaned += np->get_tx_ctx->skb->len;
dev_kfree_skb_any(np->get_tx_ctx->skb);
np->get_tx_ctx->skb = NULL;
tx_work++;
@@ -2405,7 +2421,12 @@ static int nv_tx_done(struct net_device *dev, int limit)
if (unlikely(np->get_tx_ctx++ == np->last_tx_ctx))
np->get_tx_ctx = np->first_tx_ctx;
}
- if (unlikely((np->tx_stop == 1) && (np->get_tx.orig != orig_get_tx))) {
+
+ if (bytes_cleaned)
+ netdev_queue_bytes_completed(nv_netdev_queue(np),
+ bytes_cleaned);
+ if (unlikely((np->tx_stop == 1) && (np->get_tx.orig != orig_get_tx) &&
+ netdev_queue_bytes_avail(nv_netdev_queue(np)))) {
np->tx_stop = 0;
netif_wake_queue(dev);
}
@@ -2418,6 +2439,7 @@ static int nv_tx_done_optimized(struct net_device *dev, int limit)
u32 flags;
int tx_work = 0;
struct ring_desc_ex *orig_get_tx = np->get_tx.ex;
+ unsigned long bytes_cleaned = 0;
while ((np->get_tx.ex != np->put_tx.ex) &&
!((flags = le32_to_cpu(np->get_tx.ex->flaglen)) & NV_TX2_VALID) &&
@@ -2437,6 +2459,7 @@ static int nv_tx_done_optimized(struct net_device *dev, int limit)
}
}
+ bytes_cleaned += np->get_tx_ctx->skb->len;
dev_kfree_skb_any(np->get_tx_ctx->skb);
np->get_tx_ctx->skb = NULL;
tx_work++;
@@ -2449,7 +2472,12 @@ static int nv_tx_done_optimized(struct net_device *dev, int limit)
if (unlikely(np->get_tx_ctx++ == np->last_tx_ctx))
np->get_tx_ctx = np->first_tx_ctx;
}
- if (unlikely((np->tx_stop == 1) && (np->get_tx.ex != orig_get_tx))) {
+
+ if (bytes_cleaned)
+ netdev_queue_bytes_completed(nv_netdev_queue(np),
+ bytes_cleaned);
+ if (unlikely((np->tx_stop == 1) && (np->get_tx.ex != orig_get_tx) &&
+ netdev_queue_bytes_avail(nv_netdev_queue(np)))) {
np->tx_stop = 0;
netif_wake_queue(dev);
}
@@ -5263,6 +5291,8 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
np->stats_poll.data = (unsigned long) dev;
np->stats_poll.function = nv_do_stats_poll; /* timer handler */
+ netdev_queue_bql_init(nv_netdev_queue(np));
+
err = pci_enable_device(pci_dev);
if (err)
goto out_free;
--
1.7.3.1
--
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