[PATCH net-next 4/6] net: mvpp2: limit TSO segments and use stop/wake thresholds

[Antoine Tenart]

Too many TSO descriptors can be required for the default queue size,
when using small MSS values for example. Prevent this by adding a
maximum number of allowed TSO segments (300). In addition set a stop and
a wake thresholds to stop the queue when there's no room for a 1 "worst
case scenario skb". Wake up the queue when the number of descriptors is
low enough.

Signed-off-by: Antoine Tenart <antoine.ten...@free-electrons.com>
---
 drivers/net/ethernet/marvell/mvpp2.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2.c 
b/drivers/net/ethernet/marvell/mvpp2.c
index 1f7d4ea60da0..8dc6bfbd5d0a 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -493,6 +493,13 @@
 /* Maximum number of TXQs used by single port */
 #define MVPP2_MAX_TXQ                  8
 
+/* MVPP2_MAX_TSO_SEGS is the maximum number of fragments to allow in the GSO
+ * skb. As we need a maxium of two descriptors per fragments (1 header, 1 
data),
+ * multiply this value by two to count the maximum number of skb descs needed.
+ */
+#define MVPP2_MAX_TSO_SEGS             300
+#define MVPP2_MAX_SKB_DESCS            (MVPP2_MAX_TSO_SEGS * 2 + MAX_SKB_FRAGS)
+
 /* Dfault number of RXQs in use */
 #define MVPP2_DEFAULT_RXQ              4
 
@@ -1045,6 +1052,9 @@ struct mvpp2_txq_pcpu {
         */
        int count;
 
+       int wake_threshold;
+       int stop_threshold;
+
        /* Number of Tx DMA descriptors reserved for each CPU */
        int reserved_num;
 
@@ -5393,7 +5403,7 @@ static void mvpp2_txq_done(struct mvpp2_port *port, 
struct mvpp2_tx_queue *txq,
        txq_pcpu->count -= tx_done;
 
        if (netif_tx_queue_stopped(nq))
-               if (txq_pcpu->size - txq_pcpu->count >= MAX_SKB_FRAGS + 1)
+               if (txq_pcpu->count <= txq_pcpu->wake_threshold)
                        netif_tx_wake_queue(nq);
 }
 
@@ -5636,6 +5646,9 @@ static int mvpp2_txq_init(struct mvpp2_port *port,
                txq_pcpu->txq_put_index = 0;
                txq_pcpu->txq_get_index = 0;
 
+               txq_pcpu->stop_threshold = txq->size - MVPP2_MAX_SKB_DESCS;
+               txq_pcpu->wake_threshold = txq_pcpu->stop_threshold / 2;
+
                txq_pcpu->tso_headers =
                        dma_alloc_coherent(port->dev->dev.parent,
                                           txq_pcpu->size * TSO_HEADER_SIZE,
@@ -6508,7 +6521,7 @@ static int mvpp2_tx(struct sk_buff *skb, struct 
net_device *dev)
                wmb();
                mvpp2_aggr_txq_pend_desc_add(port, frags);
 
-               if (txq_pcpu->size - txq_pcpu->count < MAX_SKB_FRAGS + 1)
+               if (txq_pcpu->count >= txq_pcpu->stop_threshold)
                        netif_tx_stop_queue(nq);
 
                u64_stats_update_begin(&stats->syncp);
@@ -7732,6 +7745,7 @@ static int mvpp2_port_probe(struct platform_device *pdev,
        dev->features = features | NETIF_F_RXCSUM;
        dev->hw_features |= features | NETIF_F_RXCSUM | NETIF_F_GRO;
        dev->vlan_features |= features;
+       dev->gso_max_segs = MVPP2_MAX_TSO_SEGS;
 
        /* MTU range: 68 - 9676 */
        dev->min_mtu = ETH_MIN_MTU;
-- 
2.14.3