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net: systemport: Implement RX coalescing control knobs 

Similarly to the TX path, allow the RX path to be configured with both
'rx-frames' and 'rx-usecs' coalescing parameters.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Florian Fainelli 2015-05-11 15:12:42 -07:00 committed by David S. Miller
parent b1a15e8643
commit d0634868d3
2 changed files with 22 additions and 7 deletions
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27
drivers/net/ethernet/broadcom/bcmsysport.c
View File

@ -467,6 +467,11 @@ static int bcm_sysport_get_coalesce(struct net_device *dev,
ec->tx_coalesce_usecs = (reg >> RING_TIMEOUT_SHIFT) * 8192 / 1000;
ec->tx_max_coalesced_frames = reg & RING_INTR_THRESH_MASK;
reg = rdma_readl(priv, RDMA_MBDONE_INTR);
ec->rx_coalesce_usecs = (reg >> RDMA_TIMEOUT_SHIFT) * 8192 / 1000;
ec->rx_max_coalesced_frames = reg & RDMA_INTR_THRESH_MASK;
return 0;
}
@ -477,16 +482,18 @@ static int bcm_sysport_set_coalesce(struct net_device *dev,
unsigned int i;
u32 reg;
/* Base system clock is 125Mhz, TDMA timeout is this reference clock
* divided by 1024, which yield roughly 8.192 us, our maximum value
* has to fit in the RING_TIMEOUT_MASK (16 bits).
/* Base system clock is 125Mhz, DMA timeout is this reference clock
* divided by 1024, which yield roughly 8.192 us, our maximum value has
* to fit in the RING_TIMEOUT_MASK (16 bits).
*/
if (ec->tx_max_coalesced_frames > RING_INTR_THRESH_MASK ||
ec->tx_coalesce_usecs > (RING_TIMEOUT_MASK * 8) + 1)
ec->tx_coalesce_usecs > (RING_TIMEOUT_MASK * 8) + 1 ||
ec->rx_max_coalesced_frames > RDMA_INTR_THRESH_MASK ||
ec->rx_coalesce_usecs > (RDMA_TIMEOUT_MASK * 8) + 1)
return -EINVAL;
if (ec->tx_coalesce_usecs == 0 &&
ec->tx_max_coalesced_frames == 0)
if ((ec->tx_coalesce_usecs == 0 && ec->tx_max_coalesced_frames == 0) ||
(ec->rx_coalesce_usecs == 0 && ec->rx_max_coalesced_frames == 0))
return -EINVAL;
for (i = 0; i < dev->num_tx_queues; i++) {
@ -499,6 +506,14 @@ static int bcm_sysport_set_coalesce(struct net_device *dev,
tdma_writel(priv, reg, TDMA_DESC_RING_INTR_CONTROL(i));
}
reg = rdma_readl(priv, RDMA_MBDONE_INTR);
reg &= ~(RDMA_INTR_THRESH_MASK |
RDMA_TIMEOUT_MASK << RDMA_TIMEOUT_SHIFT);
reg |= ec->rx_max_coalesced_frames;
reg |= DIV_ROUND_UP(ec->rx_coalesce_usecs * 1000, 8192) <<
RDMA_TIMEOUT_SHIFT;
rdma_writel(priv, reg, RDMA_MBDONE_INTR);
return 0;
}

2
drivers/net/ethernet/broadcom/bcmsysport.h
View File

@ -292,7 +292,7 @@ struct bcm_rsb {
#define RDMA_END_ADDR_LO 0x102c
#define RDMA_MBDONE_INTR 0x1030
#define RDMA_INTR_THRESH_MASK 0xff
#define RDMA_INTR_THRESH_MASK 0x1ff
#define RDMA_TIMEOUT_SHIFT 16
#define RDMA_TIMEOUT_MASK 0xffff