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Merge branch 'bcmgenet-irq-coalesce'

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Florian Fainelli says:

====================
net: bcmgenet: Interrupt coalescing

This patch series adds support for interrupt coalescing for GENET
adapters.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-09-17 22:17:14 -07:00
parent 9110fe4a17 4a29645bfe
commit 25354001d0
2 changed files with 154 additions and 5 deletions
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150
drivers/net/ethernet/broadcom/genet/bcmgenet.c
View file

@ -205,6 +205,23 @@ enum dma_reg {
DMA_INDEX2RING_5,
DMA_INDEX2RING_6,
DMA_INDEX2RING_7,
DMA_RING0_TIMEOUT,
DMA_RING1_TIMEOUT,
DMA_RING2_TIMEOUT,
DMA_RING3_TIMEOUT,
DMA_RING4_TIMEOUT,
DMA_RING5_TIMEOUT,
DMA_RING6_TIMEOUT,
DMA_RING7_TIMEOUT,
DMA_RING8_TIMEOUT,
DMA_RING9_TIMEOUT,
DMA_RING10_TIMEOUT,
DMA_RING11_TIMEOUT,
DMA_RING12_TIMEOUT,
DMA_RING13_TIMEOUT,
DMA_RING14_TIMEOUT,
DMA_RING15_TIMEOUT,
DMA_RING16_TIMEOUT,
};
static const u8 bcmgenet_dma_regs_v3plus[] = {
@ -216,6 +233,23 @@ static const u8 bcmgenet_dma_regs_v3plus[] = {
[DMA_PRIORITY_0] = 0x30,
[DMA_PRIORITY_1] = 0x34,
[DMA_PRIORITY_2] = 0x38,
[DMA_RING0_TIMEOUT] = 0x2C,
[DMA_RING1_TIMEOUT] = 0x30,
[DMA_RING2_TIMEOUT] = 0x34,
[DMA_RING3_TIMEOUT] = 0x38,
[DMA_RING4_TIMEOUT] = 0x3c,
[DMA_RING5_TIMEOUT] = 0x40,
[DMA_RING6_TIMEOUT] = 0x44,
[DMA_RING7_TIMEOUT] = 0x48,
[DMA_RING8_TIMEOUT] = 0x4c,
[DMA_RING9_TIMEOUT] = 0x50,
[DMA_RING10_TIMEOUT] = 0x54,
[DMA_RING11_TIMEOUT] = 0x58,
[DMA_RING12_TIMEOUT] = 0x5c,
[DMA_RING13_TIMEOUT] = 0x60,
[DMA_RING14_TIMEOUT] = 0x64,
[DMA_RING15_TIMEOUT] = 0x68,
[DMA_RING16_TIMEOUT] = 0x6C,
[DMA_INDEX2RING_0] = 0x70,
[DMA_INDEX2RING_1] = 0x74,
[DMA_INDEX2RING_2] = 0x78,
@ -235,6 +269,23 @@ static const u8 bcmgenet_dma_regs_v2[] = {
[DMA_PRIORITY_0] = 0x34,
[DMA_PRIORITY_1] = 0x38,
[DMA_PRIORITY_2] = 0x3C,
[DMA_RING0_TIMEOUT] = 0x2C,
[DMA_RING1_TIMEOUT] = 0x30,
[DMA_RING2_TIMEOUT] = 0x34,
[DMA_RING3_TIMEOUT] = 0x38,
[DMA_RING4_TIMEOUT] = 0x3c,
[DMA_RING5_TIMEOUT] = 0x40,
[DMA_RING6_TIMEOUT] = 0x44,
[DMA_RING7_TIMEOUT] = 0x48,
[DMA_RING8_TIMEOUT] = 0x4c,
[DMA_RING9_TIMEOUT] = 0x50,
[DMA_RING10_TIMEOUT] = 0x54,
[DMA_RING11_TIMEOUT] = 0x58,
[DMA_RING12_TIMEOUT] = 0x5c,
[DMA_RING13_TIMEOUT] = 0x60,
[DMA_RING14_TIMEOUT] = 0x64,
[DMA_RING15_TIMEOUT] = 0x68,
[DMA_RING16_TIMEOUT] = 0x6C,
};
static const u8 bcmgenet_dma_regs_v1[] = {
@ -245,6 +296,23 @@ static const u8 bcmgenet_dma_regs_v1[] = {
[DMA_PRIORITY_0] = 0x34,
[DMA_PRIORITY_1] = 0x38,
[DMA_PRIORITY_2] = 0x3C,
[DMA_RING0_TIMEOUT] = 0x2C,
[DMA_RING1_TIMEOUT] = 0x30,
[DMA_RING2_TIMEOUT] = 0x34,
[DMA_RING3_TIMEOUT] = 0x38,
[DMA_RING4_TIMEOUT] = 0x3c,
[DMA_RING5_TIMEOUT] = 0x40,
[DMA_RING6_TIMEOUT] = 0x44,
[DMA_RING7_TIMEOUT] = 0x48,
[DMA_RING8_TIMEOUT] = 0x4c,
[DMA_RING9_TIMEOUT] = 0x50,
[DMA_RING10_TIMEOUT] = 0x54,
[DMA_RING11_TIMEOUT] = 0x58,
[DMA_RING12_TIMEOUT] = 0x5c,
[DMA_RING13_TIMEOUT] = 0x60,
[DMA_RING14_TIMEOUT] = 0x64,
[DMA_RING15_TIMEOUT] = 0x68,
[DMA_RING16_TIMEOUT] = 0x6C,
};
/* Set at runtime once bcmgenet version is known */
@ -498,6 +566,86 @@ static void bcmgenet_set_msglevel(struct net_device *dev, u32 level)
priv->msg_enable = level;
}
static int bcmgenet_get_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec)
{
struct bcmgenet_priv *priv = netdev_priv(dev);
ec->tx_max_coalesced_frames =
bcmgenet_tdma_ring_readl(priv, DESC_INDEX,
DMA_MBUF_DONE_THRESH);
ec->rx_max_coalesced_frames =
bcmgenet_rdma_ring_readl(priv, DESC_INDEX,
DMA_MBUF_DONE_THRESH);
ec->rx_coalesce_usecs =
bcmgenet_rdma_readl(priv, DMA_RING16_TIMEOUT) * 8192 / 1000;
return 0;
}
static int bcmgenet_set_coalesce(struct net_device *dev,
struct ethtool_coalesce *ec)
{
struct bcmgenet_priv *priv = netdev_priv(dev);
unsigned int i;
u32 reg;
/* Base system clock is 125Mhz, DMA timeout is this reference clock
* divided by 1024, which yields roughly 8.192us, our maximum value
* has to fit in the DMA_TIMEOUT_MASK (16 bits)
*/
if (ec->tx_max_coalesced_frames > DMA_INTR_THRESHOLD_MASK ||
ec->tx_max_coalesced_frames == 0 ||
ec->rx_max_coalesced_frames > DMA_INTR_THRESHOLD_MASK ||
ec->rx_coalesce_usecs > (DMA_TIMEOUT_MASK * 8) + 1)
return -EINVAL;
if (ec->rx_coalesce_usecs == 0 && ec->rx_max_coalesced_frames == 0)
return -EINVAL;
/* GENET TDMA hardware does not support a configurable timeout, but will
* always generate an interrupt either after MBDONE packets have been
* transmitted, or when the ring is emtpy.
*/
if (ec->tx_coalesce_usecs || ec->tx_coalesce_usecs_high ||
ec->tx_coalesce_usecs_irq || ec->tx_coalesce_usecs_high ||
ec->tx_coalesce_usecs_low)
return -EOPNOTSUPP;
/* Program all TX queues with the same values, as there is no
* ethtool knob to do coalescing on a per-queue basis
*/
for (i = 0; i < priv->hw_params->tx_queues; i++)
bcmgenet_tdma_ring_writel(priv, i,
ec->tx_max_coalesced_frames,
DMA_MBUF_DONE_THRESH);
bcmgenet_tdma_ring_writel(priv, DESC_INDEX,
ec->tx_max_coalesced_frames,
DMA_MBUF_DONE_THRESH);
for (i = 0; i < priv->hw_params->rx_queues; i++) {
bcmgenet_rdma_ring_writel(priv, i,
ec->rx_max_coalesced_frames,
DMA_MBUF_DONE_THRESH);
reg = bcmgenet_rdma_readl(priv, DMA_RING0_TIMEOUT + i);
reg &= ~DMA_TIMEOUT_MASK;
reg |= DIV_ROUND_UP(ec->rx_coalesce_usecs * 1000, 8192);
bcmgenet_rdma_writel(priv, reg, DMA_RING0_TIMEOUT + i);
}
bcmgenet_rdma_ring_writel(priv, DESC_INDEX,
ec->rx_max_coalesced_frames,
DMA_MBUF_DONE_THRESH);
reg = bcmgenet_rdma_readl(priv, DMA_RING16_TIMEOUT);
reg &= ~DMA_TIMEOUT_MASK;
reg |= DIV_ROUND_UP(ec->rx_coalesce_usecs * 1000, 8192);
bcmgenet_rdma_writel(priv, reg, DMA_RING16_TIMEOUT);
return 0;
}
/* standard ethtool support functions. */
enum bcmgenet_stat_type {
BCMGENET_STAT_NETDEV = -1,
@ -844,6 +992,8 @@ static struct ethtool_ops bcmgenet_ethtool_ops = {
.get_eee = bcmgenet_get_eee,
.set_eee = bcmgenet_set_eee,
.nway_reset = bcmgenet_nway_reset,
.get_coalesce = bcmgenet_get_coalesce,
.set_coalesce = bcmgenet_set_coalesce,
};
/* Power down the unimac, based on mode. */

9
drivers/net/ethernet/broadcom/genet/bcmgenet.h
View file

@ -304,13 +304,12 @@ struct bcmgenet_mib_counters {
#define UMAC_IRQ_RXDMA_MBDONE (1 << 13)
#define UMAC_IRQ_RXDMA_PDONE (1 << 14)
#define UMAC_IRQ_RXDMA_BDONE (1 << 15)
#define UMAC_IRQ_RXDMA_DONE (UMAC_IRQ_RXDMA_PDONE | \
UMAC_IRQ_RXDMA_BDONE)
#define UMAC_IRQ_RXDMA_DONE UMAC_IRQ_RXDMA_MBDONE
#define UMAC_IRQ_TXDMA_MBDONE (1 << 16)
#define UMAC_IRQ_TXDMA_PDONE (1 << 17)
#define UMAC_IRQ_TXDMA_BDONE (1 << 18)
#define UMAC_IRQ_TXDMA_DONE (UMAC_IRQ_TXDMA_PDONE | \
UMAC_IRQ_TXDMA_BDONE)
#define UMAC_IRQ_TXDMA_DONE UMAC_IRQ_TXDMA_MBDONE
/* Only valid for GENETv3+ */
#define UMAC_IRQ_MDIO_DONE (1 << 23)
#define UMAC_IRQ_MDIO_ERROR (1 << 24)
@ -386,7 +385,7 @@ struct bcmgenet_mib_counters {
#define DMA_RING_BUFFER_SIZE_MASK 0xFFFF
/* DMA interrupt threshold register */
#define DMA_INTR_THRESHOLD_MASK 0x00FF
#define DMA_INTR_THRESHOLD_MASK 0x01FF
/* DMA XON/XOFF register */
#define DMA_XON_THREHOLD_MASK 0xFFFF