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net: systemport: Decouple flow control from __bcm_sysport_tx_reclaim 

The __bcm_sysport_tx_reclaim() function is used to reclaim transmit
resources in different places within the driver. Most of them should
not affect the state of the transit flow control.

Introduce bcm_sysport_tx_clean() which cleans the ring, but does not
re-enable flow control towards the networking stack, and make
bcm_sysport_tx_reclaim() do the actual transmit queue flow control.

Fixes: 80105befdb ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Florian Fainelli 2017-01-12 12:09:09 -08:00 committed by David S. Miller
parent 7aa4865506
commit 148d3d021c
1 changed files with 18 additions and 7 deletions
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25
drivers/net/ethernet/broadcom/bcmsysport.c
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@ -710,11 +710,8 @@ static unsigned int __bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
unsigned int c_index, last_c_index, last_tx_cn, num_tx_cbs;
unsigned int pkts_compl = 0, bytes_compl = 0;
struct bcm_sysport_cb *cb;
struct netdev_queue *txq;
u32 hw_ind;
txq = netdev_get_tx_queue(ndev, ring->index);
/* Compute how many descriptors have been processed since last call */
hw_ind = tdma_readl(priv, TDMA_DESC_RING_PROD_CONS_INDEX(ring->index));
c_index = (hw_ind >> RING_CONS_INDEX_SHIFT) & RING_CONS_INDEX_MASK;
@ -745,9 +742,6 @@ static unsigned int __bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
ring->c_index = c_index;
if (netif_tx_queue_stopped(txq) && pkts_compl)
netif_tx_wake_queue(txq);
netif_dbg(priv, tx_done, ndev,
"ring=%d c_index=%d pkts_compl=%d, bytes_compl=%d\n",
ring->index, ring->c_index, pkts_compl, bytes_compl);
@ -759,16 +753,33 @@ static unsigned int __bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
static unsigned int bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
struct bcm_sysport_tx_ring *ring)
{
struct netdev_queue *txq;
unsigned int released;
unsigned long flags;
txq = netdev_get_tx_queue(priv->netdev, ring->index);
spin_lock_irqsave(&ring->lock, flags);
released = __bcm_sysport_tx_reclaim(priv, ring);
if (released)
netif_tx_wake_queue(txq);
spin_unlock_irqrestore(&ring->lock, flags);
return released;
}
/* Locked version of the per-ring TX reclaim, but does not wake the queue */
static void bcm_sysport_tx_clean(struct bcm_sysport_priv *priv,
struct bcm_sysport_tx_ring *ring)
{
unsigned long flags;
spin_lock_irqsave(&ring->lock, flags);
__bcm_sysport_tx_reclaim(priv, ring);
spin_unlock_irqrestore(&ring->lock, flags);
}
static int bcm_sysport_tx_poll(struct napi_struct *napi, int budget)
{
struct bcm_sysport_tx_ring *ring =
@ -1252,7 +1263,7 @@ static void bcm_sysport_fini_tx_ring(struct bcm_sysport_priv *priv,
napi_disable(&ring->napi);
netif_napi_del(&ring->napi);
bcm_sysport_tx_reclaim(priv, ring);
bcm_sysport_tx_clean(priv, ring);
kfree(ring->cbs);
ring->cbs = NULL;