111 lines
2.4 KiB
Diff
111 lines
2.4 KiB
Diff
--- a/drivers/net/ethernet/cavium/cns3xxx_eth.c
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+++ b/drivers/net/ethernet/cavium/cns3xxx_eth.c
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@@ -28,6 +28,7 @@
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#define RX_DESCS 128
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#define TX_DESCS 128
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+#define TX_DESC_RESERVE 20
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#define RX_POOL_ALLOC_SIZE (sizeof(struct rx_desc) * RX_DESCS)
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#define TX_POOL_ALLOC_SIZE (sizeof(struct tx_desc) * TX_DESCS)
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@@ -266,6 +267,7 @@ struct _tx_ring {
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u32 cur_index;
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int num_used;
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int num_count;
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+ bool stopped;
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};
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struct _rx_ring {
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@@ -546,7 +548,34 @@ out:
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rx_ring->alloc_index = i;
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}
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-static void clear_tx_desc(struct sw *sw)
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+static void eth_check_num_used(struct _tx_ring *tx_ring)
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+{
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+ bool stop = false;
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+ int i;
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+
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+ if (tx_ring->num_used >= TX_DESCS - TX_DESC_RESERVE)
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+ stop = true;
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+
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+ if (tx_ring->stopped == stop)
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+ return;
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+
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+ tx_ring->stopped = stop;
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+ for (i = 0; i < 4; i++) {
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+ struct port *port = switch_port_tab[i];
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+ struct net_device *dev;
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+
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+ if (!port)
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+ continue;
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+
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+ dev = port->netdev;
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+ if (stop)
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+ netif_stop_queue(dev);
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+ else
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+ netif_wake_queue(dev);
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+ }
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+}
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+
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+static void eth_complete_tx(struct sw *sw)
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{
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struct _tx_ring *tx_ring = sw->tx_ring;
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struct tx_desc *desc;
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@@ -555,9 +584,6 @@ static void clear_tx_desc(struct sw *sw)
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int num_used = tx_ring->num_used;
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struct sk_buff *skb;
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- if (num_used < (TX_DESCS >> 1))
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- return;
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-
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index = tx_ring->free_index;
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desc = &(tx_ring)->desc[index];
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for (i = 0; i < num_used; i++) {
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@@ -580,6 +606,7 @@ static void clear_tx_desc(struct sw *sw)
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}
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tx_ring->free_index = index;
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tx_ring->num_used -= i;
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+ eth_check_num_used(tx_ring);
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}
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static int eth_poll(struct napi_struct *napi, int budget)
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@@ -688,6 +715,10 @@ static int eth_poll(struct napi_struct *
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enable_rx_dma(sw);
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+ spin_lock_bh(&tx_lock);
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+ eth_complete_tx(sw);
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+ spin_unlock_bh(&tx_lock);
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+
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return received;
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}
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@@ -732,21 +763,19 @@ static int eth_xmit(struct sk_buff *skb,
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skb_walk_frags(skb, skb1)
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nr_desc++;
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- spin_lock(&tx_lock);
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+ spin_lock_bh(&tx_lock);
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+ eth_complete_tx(sw);
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if ((tx_ring->num_used + nr_desc + 1) >= TX_DESCS) {
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- clear_tx_desc(sw);
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- if ((tx_ring->num_used + nr_desc + 1) >= TX_DESCS) {
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- spin_unlock(&tx_lock);
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- return NETDEV_TX_BUSY;
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- }
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+ spin_unlock_bh(&tx_lock);
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+ return NETDEV_TX_BUSY;
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}
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index = index0 = tx_ring->cur_index;
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index_last = (index0 + nr_desc) % TX_DESCS;
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tx_ring->cur_index = (index_last + 1) % TX_DESCS;
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- spin_unlock(&tx_lock);
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+ spin_unlock_bh(&tx_lock);
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config0 = FORCE_ROUTE;
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if (skb->ip_summed == CHECKSUM_PARTIAL)
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