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r8169: add byte queue limit support. 

Nothing fancy:
- sent bytes count is notified in the start_xmit path right before
  updating the owner bit in the hardware Tx descriptor (E. Dumazet)
- avoid useless tp->dev dereferencing in start_xmit (E. Dumazet)

Use of netdev_reset_queue is favored over proper accounting in
rtl8169_tx_clear_range since the latter would need more work for the
same result (nb: said accounting degenerates to nothing in xmit_frags).

Signed-off-by: Igor Maravic <igorm@etf.rs>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
This commit is contained in:
Igor Maravic 2012-03-05 00:01:25 +01:00 committed by Francois Romieu
parent 8027aa245b
commit 036dafa28d
1 changed files with 22 additions and 5 deletions
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27
drivers/net/ethernet/realtek/r8169.c
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@ -5399,6 +5399,7 @@ static void rtl8169_tx_clear(struct rtl8169_private *tp)
{
rtl8169_tx_clear_range(tp, tp->dirty_tx, NUM_TX_DESC);
tp->cur_tx = tp->dirty_tx = 0;
netdev_reset_queue(tp->dev);
}
static void rtl_reset_work(struct rtl8169_private *tp)
@ -5553,6 +5554,8 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
txd->opts2 = cpu_to_le32(opts[1]);
netdev_sent_queue(dev, skb->len);
wmb();
/* Anti gcc 2.95.3 bugware (sic) */
@ -5647,9 +5650,16 @@ static void rtl8169_pcierr_interrupt(struct net_device *dev)
rtl_schedule_task(tp, RTL_FLAG_TASK_RESET_PENDING);
}
struct rtl_txc {
int packets;
int bytes;
};
static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp)
{
struct rtl8169_stats *tx_stats = &tp->tx_stats;
unsigned int dirty_tx, tx_left;
struct rtl_txc txc = { 0, 0 };
dirty_tx = tp->dirty_tx;
smp_rmb();
@ -5668,17 +5678,24 @@ static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp)
rtl8169_unmap_tx_skb(&tp->pci_dev->dev, tx_skb,
tp->TxDescArray + entry);
if (status & LastFrag) {
u64_stats_update_begin(&tp->tx_stats.syncp);
tp->tx_stats.packets++;
tp->tx_stats.bytes += tx_skb->skb->len;
u64_stats_update_end(&tp->tx_stats.syncp);
dev_kfree_skb(tx_skb->skb);
struct sk_buff *skb = tx_skb->skb;
txc.packets++;
txc.bytes += skb->len;
dev_kfree_skb(skb);
tx_skb->skb = NULL;
}
dirty_tx++;
tx_left--;
}
u64_stats_update_begin(&tx_stats->syncp);
tx_stats->packets += txc.packets;
tx_stats->bytes += txc.bytes;
u64_stats_update_end(&tx_stats->syncp);
netdev_completed_queue(dev, txc.packets, txc.bytes);
if (tp->dirty_tx != dirty_tx) {
tp->dirty_tx = dirty_tx;
/* Sync with rtl8169_start_xmit: