diff options
author | Lendacky, Thomas <Thomas.Lendacky@amd.com> | 2014-11-20 20:04:08 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2014-11-21 23:19:11 +0300 |
commit | 16958a2b05def4ed214ae681b7ee4ce8537b00fb (patch) | |
tree | 252e22443ecfa3b53e6439b228c4f44d875046fe /drivers/net/ethernet/amd/xgbe/xgbe-drv.c | |
parent | eb79e640fab1fc163e6f04e0cc007c76b6a46f28 (diff) | |
download | linux-16958a2b05def4ed214ae681b7ee4ce8537b00fb.tar.xz |
amd-xgbe: Add support for the skb->xmit_more flag
Add support to delay telling the hardware about data that is ready to
be transmitted if the skb->xmit_more flag is set.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/amd/xgbe/xgbe-drv.c')
-rw-r--r-- | drivers/net/ethernet/amd/xgbe/xgbe-drv.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c index f9635281c7df..02c104dc2aa4 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c @@ -225,6 +225,28 @@ static inline unsigned int xgbe_tx_avail_desc(struct xgbe_ring *ring) return (ring->rdesc_count - (ring->cur - ring->dirty)); } +static int xgbe_maybe_stop_tx_queue(struct xgbe_channel *channel, + struct xgbe_ring *ring, unsigned int count) +{ + struct xgbe_prv_data *pdata = channel->pdata; + + if (count > xgbe_tx_avail_desc(ring)) { + DBGPR(" Tx queue stopped, not enough descriptors available\n"); + netif_stop_subqueue(pdata->netdev, channel->queue_index); + ring->tx.queue_stopped = 1; + + /* If we haven't notified the hardware because of xmit_more + * support, tell it now + */ + if (ring->tx.xmit_more) + pdata->hw_if.tx_start_xmit(channel, ring); + + return NETDEV_TX_BUSY; + } + + return 0; +} + static int xgbe_calc_rx_buf_size(struct net_device *netdev, unsigned int mtu) { unsigned int rx_buf_size; @@ -1199,6 +1221,8 @@ static void xgbe_packet_info(struct xgbe_prv_data *pdata, unsigned int len; unsigned int i; + packet->skb = skb; + context_desc = 0; packet->rdesc_count = 0; @@ -1447,13 +1471,9 @@ static int xgbe_xmit(struct sk_buff *skb, struct net_device *netdev) xgbe_packet_info(pdata, ring, skb, packet); /* Check that there are enough descriptors available */ - if (packet->rdesc_count > xgbe_tx_avail_desc(ring)) { - DBGPR(" Tx queue stopped, not enough descriptors available\n"); - netif_stop_subqueue(netdev, channel->queue_index); - ring->tx.queue_stopped = 1; - ret = NETDEV_TX_BUSY; + ret = xgbe_maybe_stop_tx_queue(channel, ring, packet->rdesc_count); + if (ret) goto tx_netdev_return; - } ret = xgbe_prep_tso(skb, packet); if (ret) { @@ -1480,6 +1500,11 @@ static int xgbe_xmit(struct sk_buff *skb, struct net_device *netdev) xgbe_print_pkt(netdev, skb, true); #endif + /* Stop the queue in advance if there may not be enough descriptors */ + xgbe_maybe_stop_tx_queue(channel, ring, XGBE_TX_MAX_DESCS); + + ret = NETDEV_TX_OK; + tx_netdev_return: spin_unlock_irqrestore(&ring->lock, flags); |