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Date: Thu, 29 Mar 2018 10:53:35 -0700
From: Doug Berger <opendmb@...il.com>
To: Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Cc: davem@...emloft.net, jaedon.shin@...il.com, pgynther@...gle.com,
Michael Chan <michael.chan@...adcom.com>, gospo@...adcom.com,
talgi@...lanox.com, saeedm@...lanox.com
Subject: Re: [PATCH net-next 3/3] net: bcmgenet: Fix coalescing settings
handling
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 <f.fainelli@...il.com>
>> ---
>> 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
>
>> }
>>
>> ring = &priv->rx_rings[DESC_INDEX];
>> - 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);
> so you don't need to repeat it here. (just for maintenance reasons)
Looks like you already did in V2 :)!
I should read my mail more frequently ;).
>
>>
>> return 0;
>> }
>> @@ -1924,10 +1938,7 @@ static void bcmgenet_dim_work(struct work_struct *work)
>> struct net_dim_cq_moder cur_profile =
>> net_dim_get_profile(dim->mode, dim->profile_ix);
>>
>> - ring->dim.coal_usecs = cur_profile.usec;
>> - ring->dim.coal_pkts = cur_profile.pkts;
>> -
>> - bcmgenet_set_rx_coalesce(ring);
>> + bcmgenet_set_rx_coalesce(ring, cur_profile.usec, cur_profile.pkts);
>> dim->state = NET_DIM_START_MEASURE;
>> }
>>
>> @@ -2079,14 +2090,30 @@ static void init_umac(struct bcmgenet_priv *priv)
>> dev_dbg(kdev, "done init umac\n");
>> }
>>
>> -static void bcmgenet_init_dim(struct bcmgenet_net_dim *dim,
>> +static void bcmgenet_init_dim(struct bcmgenet_rx_ring *ring,
>> void (*cb)(struct work_struct *work))
>> {
>> + struct bcmgenet_net_dim *dim = &ring->dim;
>> + struct net_dim_cq_moder moder;
>> + u32 usecs, pkts;
>> +
>> INIT_WORK(&dim->dim.work, cb);
>> dim->dim.mode = NET_DIM_CQ_PERIOD_MODE_START_FROM_EQE;
>> dim->event_ctr = 0;
>> dim->packets = 0;
>> dim->bytes = 0;
>> +
>> + usecs = ring->rx_coalesce_usecs;
>> + pkts = ring->rx_max_coalesced_frames;
>> +
>> + /* If DIM was enabled, re-apply default parameters */
>> + if (dim->use_dim) {
>> + moder = net_dim_get_def_profile(dim->dim.mode);
>> + usecs = moder.usec;
>> + pkts = moder.pkts;
>> + }
>> +
>> + bcmgenet_set_rx_coalesce(ring, usecs, pkts);
>> }
>>
>> /* Initialize a Tx ring along with corresponding hardware registers */
>> @@ -2178,7 +2205,7 @@ static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
>> if (ret)
>> return ret;
>>
>> - bcmgenet_init_dim(&ring->dim, bcmgenet_dim_work);
>> + bcmgenet_init_dim(ring, bcmgenet_dim_work);
>>
>> /* Initialize Rx NAPI */
>> netif_napi_add(priv->dev, &ring->napi, bcmgenet_rx_poll,
>> @@ -2186,7 +2213,6 @@ static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
>>
>> bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_PROD_INDEX);
>> bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_CONS_INDEX);
>> - bcmgenet_rdma_ring_writel(priv, index, 1, DMA_MBUF_DONE_THRESH);
>> bcmgenet_rdma_ring_writel(priv, index,
>> ((size << DMA_RING_SIZE_SHIFT) |
>> RX_BUF_LENGTH), DMA_RING_BUF_SIZE);
>> @@ -3424,6 +3450,7 @@ static int bcmgenet_probe(struct platform_device *pdev)
>> struct net_device *dev;
>> const void *macaddr;
>> struct resource *r;
>> + unsigned int i;
>> int err = -EIO;
>> const char *phy_mode_str;
>>
>> @@ -3552,6 +3579,11 @@ static int bcmgenet_probe(struct platform_device *pdev)
>> netif_set_real_num_tx_queues(priv->dev, priv->hw_params->tx_queues + 1);
>> netif_set_real_num_rx_queues(priv->dev, priv->hw_params->rx_queues + 1);
>>
>> + /* Set default coalescing parameters */
>> + for (i = 0; i < priv->hw_params->rx_queues; i++)
>> + priv->rx_rings[i].rx_max_coalesced_frames = 1;
>> + priv->rx_rings[DESC_INDEX].rx_max_coalesced_frames = 1;
>> +
>> /* libphy will determine the link state */
>> netif_carrier_off(dev);
>>
>> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
>> index 22c41e0430fb..b773bc07edf7 100644
>> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h
>> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
>> @@ -578,8 +578,6 @@ struct bcmgenet_net_dim {
>> u16 event_ctr;
>> unsigned long packets;
>> unsigned long bytes;
>> - u32 coal_usecs;
>> - u32 coal_pkts;
>> struct net_dim dim;
>> };
>>
>> @@ -598,6 +596,8 @@ struct bcmgenet_rx_ring {
>> unsigned int end_ptr; /* Rx ring end CB ptr */
>> unsigned int old_discards;
>> struct bcmgenet_net_dim dim;
>> + u32 rx_max_coalesced_frames;
>> + u32 rx_coalesce_usecs;
>> void (*int_enable)(struct bcmgenet_rx_ring *);
>> void (*int_disable)(struct bcmgenet_rx_ring *);
>> struct bcmgenet_priv *priv;
>>
>
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