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net: mvneta: Clean mvneta_tx() sk_buff handling

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Rework mvneta_tx() so that the code that performs the final handling
before a sk_buff is transmitted is done only if the numbers of fragments
processed if positive.

This is preparation work to add the support for software TSO.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ezequiel Garcia 2014-05-19 13:59:54 -03:00 committed by David S. Miller
parent 01ef26ca44
commit e19d2dda90
1 changed files with 7 additions and 8 deletions
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15
drivers/net/ethernet/marvell/mvneta.c
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@ -1584,7 +1584,6 @@ static int mvneta_tx(struct sk_buff *skb, struct net_device *dev)
u16 txq_id = skb_get_queue_mapping(skb);
struct mvneta_tx_queue *txq = &pp->txqs[txq_id];
struct mvneta_tx_desc *tx_desc;
struct netdev_queue *nq;
int frags = 0;
u32 tx_cmd;
@ -1592,7 +1591,6 @@ static int mvneta_tx(struct sk_buff *skb, struct net_device *dev)
goto out;
frags = skb_shinfo(skb)->nr_frags + 1;
nq = netdev_get_tx_queue(dev, txq_id);
/* Get a descriptor for the first part of the packet */
tx_desc = mvneta_txq_next_desc_get(txq);
@ -1635,15 +1633,16 @@ static int mvneta_tx(struct sk_buff *skb, struct net_device *dev)
}
}
txq->count += frags;
mvneta_txq_pend_desc_add(pp, txq, frags);
if (txq->size - txq->count < MAX_SKB_FRAGS + 1)
netif_tx_stop_queue(nq);
out:
if (frags > 0) {
struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
struct netdev_queue *nq = netdev_get_tx_queue(dev, txq_id);
txq->count += frags;
mvneta_txq_pend_desc_add(pp, txq, frags);
if (txq->size - txq->count < MAX_SKB_FRAGS + 1)
netif_tx_stop_queue(nq);
u64_stats_update_begin(&stats->syncp);
stats->tx_packets++;