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pasemi_mac: don't enable rx before there are buffers on the ring 

pasemi_mac: don't enable rx before there are buffers on the ring

Reorder initialization of the DMA channels and the interface. Before there
was a time window when the interface was enabled before DMA was enabled.
Also, now there will always be RX buffers available at the time the
MAC interface is enabled, to avoid temporary out-of-buffer errors for the
very first packets (on busy networks).

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Olof Johansson 2007-09-26 16:24:42 -05:00 committed by David S. Miller
parent ca7e235f5e
commit 3603376653
1 changed files with 11 additions and 10 deletions
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21
drivers/net/pasemi_mac.c
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@ -786,14 +786,6 @@ static int pasemi_mac_open(struct net_device *dev)
write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
if (mac->type == MAC_TYPE_GMAC)
flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
else
flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
write_iob_reg(mac, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
PAS_IOB_DMA_RXCH_CFG_CNTTH(0));
@ -808,8 +800,6 @@ static int pasemi_mac_open(struct net_device *dev)
write_iob_reg(mac, PAS_IOB_DMA_COM_TIMEOUTCFG,
PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
ret = pasemi_mac_setup_rx_resources(dev);
if (ret)
goto out_rx_resources;
@ -837,6 +827,17 @@ static int pasemi_mac_open(struct net_device *dev)
pasemi_mac_replenish_rx_ring(dev);
flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
if (mac->type == MAC_TYPE_GMAC)
flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
else
flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
/* Enable interface in MAC */
write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
ret = pasemi_mac_phy_init(dev);
/* Some configs don't have PHYs (XAUI etc), so don't complain about
* failed init due to -ENODEV.