On 03/29/2018 10:51 AM, Doug Berger wrote:
> On 03/27/2018 12:47 PM, Florian Fainelli wrote:
>> There were a number of issues with setting the RX coalescing parameters:
>>
>> - we would not be preserving values that would have been configured
>> across close/open calls, instead we would always reset to no timeout
>> and 1 interrupt per packet, this would also prevent DIM from setting its
>> default usec/pkts values
>>
>> - when adaptive RX would be turned on, we woud not be fetching the
>> default parameters, we would stay with no timeout/1 packet per interrupt
>> until the estimator kicks in and changes that
>>
>> - finally disabling adaptive RX coalescing while providing parameters
>> would not be honored, and we would stay with whatever DIM had previously
>> determined instead of the user requested parameters
>>
>> Fixes: 9f4ca05827a2 ("net: bcmgenet: Add support for adaptive RX coalescing")
>> Signed-off-by: Florian Fainelli <[email protected]>
>> ---
>> drivers/net/ethernet/broadcom/genet/bcmgenet.c | 78
>> ++++++++++++++++++--------
>> drivers/net/ethernet/broadcom/genet/bcmgenet.h | 4 +-
>> 2 files changed, 57 insertions(+), 25 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> index 7db8edc643ec..76409debb796 100644
>> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
>> @@ -625,18 +625,18 @@ static int bcmgenet_get_coalesce(struct net_device
>> *dev,
>> return 0;
>> }
>>
>> -static void bcmgenet_set_rx_coalesce(struct bcmgenet_rx_ring *ring)
>> +static void bcmgenet_set_rx_coalesce(struct bcmgenet_rx_ring *ring,
>> + u32 usecs, u32 pkts)
>> {
>> struct bcmgenet_priv *priv = ring->priv;
>> unsigned int i = ring->index;
>> u32 reg;
>>
>> - bcmgenet_rdma_ring_writel(priv, i, ring->dim.coal_pkts,
>> - DMA_MBUF_DONE_THRESH);
>> + bcmgenet_rdma_ring_writel(priv, i, pkts, DMA_MBUF_DONE_THRESH);
>>
>> reg = bcmgenet_rdma_readl(priv, DMA_RING0_TIMEOUT + i);
>> reg &= ~DMA_TIMEOUT_MASK;
>> - reg |= DIV_ROUND_UP(ring->dim.coal_usecs * 1000, 8192);
>> + reg |= DIV_ROUND_UP(usecs * 1000, 8192);
>> bcmgenet_rdma_writel(priv, reg, DMA_RING0_TIMEOUT + i);
>> }
>>
>> @@ -645,6 +645,8 @@ static int bcmgenet_set_coalesce(struct net_device *dev,
>> {
>> struct bcmgenet_priv *priv = netdev_priv(dev);
>> struct bcmgenet_rx_ring *ring;
>> + struct net_dim_cq_moder moder;
>> + u32 usecs, pkts;
>> unsigned int i;
>>
>> /* Base system clock is 125Mhz, DMA timeout is this reference clock
>> @@ -682,25 +684,37 @@ static int bcmgenet_set_coalesce(struct net_device
>> *dev,
>>
>> for (i = 0; i < priv->hw_params->rx_queues; i++) {
>> ring = &priv->rx_rings[i];
>> - ring->dim.coal_usecs = ec->rx_coalesce_usecs;
>> - ring->dim.coal_pkts = ec->rx_max_coalesced_frames;
>> - if (!ec->use_adaptive_rx_coalesce && ring->dim.use_dim) {
>> - ring->dim.coal_pkts = 1;
>> - ring->dim.coal_usecs = 0;
>> +
>> + ring->rx_coalesce_usecs = ec->rx_coalesce_usecs;
>> + ring->rx_max_coalesced_frames = ec->rx_max_coalesced_frames;
>> + usecs = ring->rx_coalesce_usecs;
>> + pkts = ring->rx_max_coalesced_frames;
>> +
>> + if (ec->use_adaptive_rx_coalesce) {
>> + moder = net_dim_get_def_profile(ring->dim.dim.mode);
>> + usecs = moder.usec;
>> + pkts = moder.pkts;
>> }
>> +
>> ring->dim.use_dim = ec->use_adaptive_rx_coalesce;
>> - bcmgenet_set_rx_coalesce(ring);
>> + bcmgenet_set_rx_coalesce(ring, usecs, pkts);
> You might want to put this loop code in a separate function with ring
> and ec parameters
Indeed, that also itched me, v2 has this in a function:
http://patchwork.ozlabs.org/patch/892509/
(gmail coalescing threads, oh oh oh, what a good pun).
Thanks!
--
Florian
