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Date: Thu, 29 Mar 2018 00:23:43 +0300
From: Tal Gilboa <talgi@...lanox.com>
To: Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Cc: davem@...emloft.net, jaedon.shin@...il.com, pgynther@...gle.com,
opendmb@...il.com, Michael Chan <michael.chan@...adcom.com>,
gospo@...adcom.com, saeedm@...lanox.com
Subject: Re: [PATCH net-next 2/3] net: systemport: Fix coalescing settings
handling
On 3/27/2018 10:47 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: b6e0e875421e ("net: systemport: Implement adaptive interrupt coalescing")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> drivers/net/ethernet/broadcom/bcmsysport.c | 57 ++++++++++++++++++++----------
> drivers/net/ethernet/broadcom/bcmsysport.h | 4 +--
> 2 files changed, 41 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
> index 1e52bb7d822e..43ad6300c351 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.c
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.c
> @@ -574,16 +574,16 @@ static int bcm_sysport_set_wol(struct net_device *dev,
> return 0;
> }
>
> -static void bcm_sysport_set_rx_coalesce(struct bcm_sysport_priv *priv)
> +static void bcm_sysport_set_rx_coalesce(struct bcm_sysport_priv *priv,
> + u32 usecs, u32 pkts)
> {
> u32 reg;
>
> reg = rdma_readl(priv, RDMA_MBDONE_INTR);
> reg &= ~(RDMA_INTR_THRESH_MASK |
> RDMA_TIMEOUT_MASK << RDMA_TIMEOUT_SHIFT);
> - reg |= priv->dim.coal_pkts;
> - reg |= DIV_ROUND_UP(priv->dim.coal_usecs * 1000, 8192) <<
> - RDMA_TIMEOUT_SHIFT;
> + reg |= pkts;
> + reg |= DIV_ROUND_UP(usecs * 1000, 8192) << RDMA_TIMEOUT_SHIFT;
> rdma_writel(priv, reg, RDMA_MBDONE_INTR);
> }
>
> @@ -626,6 +626,8 @@ static int bcm_sysport_set_coalesce(struct net_device *dev,
> struct ethtool_coalesce *ec)
> {
> struct bcm_sysport_priv *priv = netdev_priv(dev);
> + struct net_dim_cq_moder moder;
> + u32 usecs, pkts;
> unsigned int i;
>
> /* Base system clock is 125Mhz, DMA timeout is this reference clock
> @@ -646,15 +648,22 @@ static int bcm_sysport_set_coalesce(struct net_device *dev,
> for (i = 0; i < dev->num_tx_queues; i++)
> bcm_sysport_set_tx_coalesce(&priv->tx_rings[i], ec);
>
> - priv->dim.coal_usecs = ec->rx_coalesce_usecs;
> - priv->dim.coal_pkts = ec->rx_max_coalesced_frames;
> + priv->rx_coalesce_usecs = ec->rx_coalesce_usecs;
> + priv->rx_max_coalesced_frames = ec->rx_max_coalesced_frames;
> + usecs = priv->rx_coalesce_usecs;
> + pkts = priv->rx_max_coalesced_frames;
>
> - if (!ec->use_adaptive_rx_coalesce && priv->dim.use_dim) {
> - priv->dim.coal_pkts = 1;
> - priv->dim.coal_usecs = 0;
> + /* If DIM is enabled, immediately obtain default parameters */
> + if (ec->use_adaptive_rx_coalesce) {
> + moder = net_dim_get_def_profile(priv->dim.dim.mode);
> + usecs = moder.usec;
> + pkts = moder.pkts;
> }
What if DIM is already in use? We don't want to set default values if
DIM is already working.
> +
> priv->dim.use_dim = ec->use_adaptive_rx_coalesce;
> - bcm_sysport_set_rx_coalesce(priv);
> +
> + /* Apply desired coalescing parameters */
> + bcm_sysport_set_rx_coalesce(priv, usecs, pkts);
>
> return 0;
> }
> @@ -1058,10 +1067,7 @@ static void bcm_sysport_dim_work(struct work_struct *work)
> struct net_dim_cq_moder cur_profile =
> net_dim_get_profile(dim->mode, dim->profile_ix);
>
> - priv->dim.coal_usecs = cur_profile.usec;
> - priv->dim.coal_pkts = cur_profile.pkts;
> -
> - bcm_sysport_set_rx_coalesce(priv);
> + bcm_sysport_set_rx_coalesce(priv, cur_profile.usec, cur_profile.pkts);
> dim->state = NET_DIM_START_MEASURE;
> }
>
> @@ -1408,14 +1414,30 @@ static void bcm_sysport_adj_link(struct net_device *dev)
> phy_print_status(phydev);
> }
>
> -static void bcm_sysport_init_dim(struct bcm_sysport_net_dim *dim,
> +static void bcm_sysport_init_dim(struct bcm_sysport_priv *priv,
> void (*cb)(struct work_struct *work))
> {
> + struct bcm_sysport_net_dim *dim = &priv->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;
I would expect only dim related code in a function called init_dim(). I
think the code below should be elsewhere. Or maybe change the function
name to init_rx_coalesce().
> +
> + usecs = priv->rx_coalesce_usecs;
> + pkts = priv->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;
> + }
> +
> + bcm_sysport_set_rx_coalesce(priv, usecs, pkts);
> }
>
> static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,
> @@ -1658,8 +1680,6 @@ static int bcm_sysport_init_rx_ring(struct bcm_sysport_priv *priv)
> rdma_writel(priv, 0, RDMA_END_ADDR_HI);
> rdma_writel(priv, priv->num_rx_desc_words - 1, RDMA_END_ADDR_LO);
>
> - rdma_writel(priv, 1, RDMA_MBDONE_INTR);
> -
> netif_dbg(priv, hw, priv->netdev,
> "RDMA cfg, num_rx_bds=%d, rx_bds=%p\n",
> priv->num_rx_bds, priv->rx_bds);
> @@ -1827,7 +1847,7 @@ static void bcm_sysport_netif_start(struct net_device *dev)
> struct bcm_sysport_priv *priv = netdev_priv(dev);
>
> /* Enable NAPI */
> - bcm_sysport_init_dim(&priv->dim, bcm_sysport_dim_work);
> + bcm_sysport_init_dim(priv, bcm_sysport_dim_work);
> napi_enable(&priv->napi);
>
> /* Enable RX interrupt and TX ring full interrupt */
> @@ -2333,6 +2353,7 @@ static int bcm_sysport_probe(struct platform_device *pdev)
> /* libphy will adjust the link state accordingly */
> netif_carrier_off(dev);
>
> + priv->rx_max_coalesced_frames = 1;
> u64_stats_init(&priv->syncp);
>
> priv->dsa_notifier.notifier_call = bcm_sysport_dsa_notifier;
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.h b/drivers/net/ethernet/broadcom/bcmsysport.h
> index 57e18ef8f206..d6e5d0cbf3a3 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.h
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.h
> @@ -701,8 +701,6 @@ struct bcm_sysport_net_dim {
> u16 event_ctr;
> unsigned long packets;
> unsigned long bytes;
> - u32 coal_usecs;
> - u32 coal_pkts;
> struct net_dim dim;
> };
>
> @@ -755,6 +753,8 @@ struct bcm_sysport_priv {
> unsigned int rx_c_index;
>
> struct bcm_sysport_net_dim dim;
> + u32 rx_max_coalesced_frames;
> + u32 rx_coalesce_usecs;
>
> /* PHY device */
> struct device_node *phy_dn;
>
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