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Merge branch 'net-Broadcom-drivers-coalescing-fixes'
Florian Fainelli says: ==================== net: Broadcom drivers coalescing fixes Following Tal's review of the adaptive RX/TX coalescing feature added to the SYSTEMPORT and GENET driver a number of things showed up: - adaptive TX coalescing is not actually a good idea with the current way the estimator will program the ring, this results in a higher CPU load, NAPI on TX already does a reasonably good job at maintaining the interrupt count low - both SYSTEMPORT and GENET would suffer from the same issues while configuring coalescing parameters where the values would just not be applied correctly based on user settings, so we fix that too Tal, thanks again for your feedback, I would appreciate if you could review that the new behavior appears to be implemented correctly. Thanks! Changes in v2: - added Tal's reviewed-by to the first patch - split DIM initialization from coalescing parameters initialization - avoid duplicating the same code in bcmgenet_set_coalesce() when configuring RX rings - fixed the condition where default DIM parameters would be applied when adaptive RX coalescing would be enabled, do this only if it was disabled before ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
95e623fd98
@ -15,7 +15,6 @@
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/net_dim.h>
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#include <linux/etherdevice.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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@ -575,20 +574,21 @@ static int bcm_sysport_set_wol(struct net_device *dev,
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return 0;
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}
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static void bcm_sysport_set_rx_coalesce(struct bcm_sysport_priv *priv)
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static void bcm_sysport_set_rx_coalesce(struct bcm_sysport_priv *priv,
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u32 usecs, u32 pkts)
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{
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u32 reg;
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reg = rdma_readl(priv, RDMA_MBDONE_INTR);
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reg &= ~(RDMA_INTR_THRESH_MASK |
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RDMA_TIMEOUT_MASK << RDMA_TIMEOUT_SHIFT);
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reg |= priv->dim.coal_pkts;
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reg |= DIV_ROUND_UP(priv->dim.coal_usecs * 1000, 8192) <<
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RDMA_TIMEOUT_SHIFT;
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reg |= pkts;
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reg |= DIV_ROUND_UP(usecs * 1000, 8192) << RDMA_TIMEOUT_SHIFT;
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rdma_writel(priv, reg, RDMA_MBDONE_INTR);
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}
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static void bcm_sysport_set_tx_coalesce(struct bcm_sysport_tx_ring *ring)
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static void bcm_sysport_set_tx_coalesce(struct bcm_sysport_tx_ring *ring,
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struct ethtool_coalesce *ec)
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{
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struct bcm_sysport_priv *priv = ring->priv;
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u32 reg;
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@ -596,8 +596,8 @@ static void bcm_sysport_set_tx_coalesce(struct bcm_sysport_tx_ring *ring)
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reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(ring->index));
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reg &= ~(RING_INTR_THRESH_MASK |
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RING_TIMEOUT_MASK << RING_TIMEOUT_SHIFT);
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reg |= ring->dim.coal_pkts;
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reg |= DIV_ROUND_UP(ring->dim.coal_usecs * 1000, 8192) <<
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reg |= ec->tx_max_coalesced_frames;
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reg |= DIV_ROUND_UP(ec->tx_coalesce_usecs * 1000, 8192) <<
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RING_TIMEOUT_SHIFT;
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tdma_writel(priv, reg, TDMA_DESC_RING_INTR_CONTROL(ring->index));
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}
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@ -606,18 +606,12 @@ static int bcm_sysport_get_coalesce(struct net_device *dev,
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struct ethtool_coalesce *ec)
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{
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struct bcm_sysport_priv *priv = netdev_priv(dev);
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struct bcm_sysport_tx_ring *ring;
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unsigned int i;
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u32 reg;
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reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(0));
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ec->tx_coalesce_usecs = (reg >> RING_TIMEOUT_SHIFT) * 8192 / 1000;
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ec->tx_max_coalesced_frames = reg & RING_INTR_THRESH_MASK;
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for (i = 0; i < dev->num_tx_queues; i++) {
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ring = &priv->tx_rings[i];
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ec->use_adaptive_tx_coalesce |= ring->dim.use_dim;
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}
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reg = rdma_readl(priv, RDMA_MBDONE_INTR);
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@ -632,7 +626,8 @@ static int bcm_sysport_set_coalesce(struct net_device *dev,
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struct ethtool_coalesce *ec)
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{
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struct bcm_sysport_priv *priv = netdev_priv(dev);
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struct bcm_sysport_tx_ring *ring;
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struct net_dim_cq_moder moder;
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u32 usecs, pkts;
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unsigned int i;
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/* Base system clock is 125Mhz, DMA timeout is this reference clock
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@ -646,30 +641,28 @@ static int bcm_sysport_set_coalesce(struct net_device *dev,
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return -EINVAL;
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if ((ec->tx_coalesce_usecs == 0 && ec->tx_max_coalesced_frames == 0) ||
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(ec->rx_coalesce_usecs == 0 && ec->rx_max_coalesced_frames == 0))
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(ec->rx_coalesce_usecs == 0 && ec->rx_max_coalesced_frames == 0) ||
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ec->use_adaptive_tx_coalesce)
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return -EINVAL;
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for (i = 0; i < dev->num_tx_queues; i++) {
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ring = &priv->tx_rings[i];
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ring->dim.coal_pkts = ec->tx_max_coalesced_frames;
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ring->dim.coal_usecs = ec->tx_coalesce_usecs;
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if (!ec->use_adaptive_tx_coalesce && ring->dim.use_dim) {
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ring->dim.coal_pkts = 1;
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ring->dim.coal_usecs = 0;
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}
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ring->dim.use_dim = ec->use_adaptive_tx_coalesce;
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bcm_sysport_set_tx_coalesce(ring);
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for (i = 0; i < dev->num_tx_queues; i++)
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bcm_sysport_set_tx_coalesce(&priv->tx_rings[i], ec);
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priv->rx_coalesce_usecs = ec->rx_coalesce_usecs;
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priv->rx_max_coalesced_frames = ec->rx_max_coalesced_frames;
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usecs = priv->rx_coalesce_usecs;
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pkts = priv->rx_max_coalesced_frames;
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if (ec->use_adaptive_rx_coalesce && !priv->dim.use_dim) {
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moder = net_dim_get_def_profile(priv->dim.dim.mode);
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usecs = moder.usec;
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pkts = moder.pkts;
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}
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priv->dim.coal_usecs = ec->rx_coalesce_usecs;
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priv->dim.coal_pkts = ec->rx_max_coalesced_frames;
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if (!ec->use_adaptive_rx_coalesce && priv->dim.use_dim) {
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priv->dim.coal_pkts = 1;
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priv->dim.coal_usecs = 0;
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}
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priv->dim.use_dim = ec->use_adaptive_rx_coalesce;
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bcm_sysport_set_rx_coalesce(priv);
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/* Apply desired coalescing parameters */
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bcm_sysport_set_rx_coalesce(priv, usecs, pkts);
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return 0;
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}
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@ -940,8 +933,6 @@ static unsigned int __bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
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ring->packets += pkts_compl;
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ring->bytes += bytes_compl;
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u64_stats_update_end(&priv->syncp);
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ring->dim.packets = pkts_compl;
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ring->dim.bytes = bytes_compl;
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ring->c_index = c_index;
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@ -987,7 +978,6 @@ static int bcm_sysport_tx_poll(struct napi_struct *napi, int budget)
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{
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struct bcm_sysport_tx_ring *ring =
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container_of(napi, struct bcm_sysport_tx_ring, napi);
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struct net_dim_sample dim_sample;
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unsigned int work_done = 0;
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work_done = bcm_sysport_tx_reclaim(ring->priv, ring);
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@ -1004,12 +994,6 @@ static int bcm_sysport_tx_poll(struct napi_struct *napi, int budget)
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return 0;
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}
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if (ring->dim.use_dim) {
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net_dim_sample(ring->dim.event_ctr, ring->dim.packets,
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ring->dim.bytes, &dim_sample);
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net_dim(&ring->dim.dim, dim_sample);
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}
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return budget;
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}
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@ -1082,27 +1066,7 @@ static void bcm_sysport_dim_work(struct work_struct *work)
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struct net_dim_cq_moder cur_profile =
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net_dim_get_profile(dim->mode, dim->profile_ix);
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priv->dim.coal_usecs = cur_profile.usec;
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priv->dim.coal_pkts = cur_profile.pkts;
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bcm_sysport_set_rx_coalesce(priv);
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dim->state = NET_DIM_START_MEASURE;
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}
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static void bcm_sysport_dim_tx_work(struct work_struct *work)
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{
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struct net_dim *dim = container_of(work, struct net_dim, work);
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struct bcm_sysport_net_dim *ndim =
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container_of(dim, struct bcm_sysport_net_dim, dim);
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struct bcm_sysport_tx_ring *ring =
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container_of(ndim, struct bcm_sysport_tx_ring, dim);
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struct net_dim_cq_moder cur_profile =
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net_dim_get_profile(dim->mode, dim->profile_ix);
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ring->dim.coal_usecs = cur_profile.usec;
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ring->dim.coal_pkts = cur_profile.pkts;
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bcm_sysport_set_tx_coalesce(ring);
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bcm_sysport_set_rx_coalesce(priv, cur_profile.usec, cur_profile.pkts);
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dim->state = NET_DIM_START_MEASURE;
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}
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@ -1152,7 +1116,6 @@ static irqreturn_t bcm_sysport_rx_isr(int irq, void *dev_id)
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continue;
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txr = &priv->tx_rings[ring];
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txr->dim.event_ctr++;
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if (likely(napi_schedule_prep(&txr->napi))) {
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intrl2_0_mask_set(priv, ring_bit);
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@ -1185,7 +1148,6 @@ static irqreturn_t bcm_sysport_tx_isr(int irq, void *dev_id)
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continue;
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txr = &priv->tx_rings[ring];
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txr->dim.event_ctr++;
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if (likely(napi_schedule_prep(&txr->napi))) {
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intrl2_1_mask_set(priv, BIT(ring));
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@ -1451,9 +1413,11 @@ out:
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phy_print_status(phydev);
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}
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static void bcm_sysport_init_dim(struct bcm_sysport_net_dim *dim,
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static void bcm_sysport_init_dim(struct bcm_sysport_priv *priv,
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void (*cb)(struct work_struct *work))
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{
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struct bcm_sysport_net_dim *dim = &priv->dim;
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INIT_WORK(&dim->dim.work, cb);
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dim->dim.mode = NET_DIM_CQ_PERIOD_MODE_START_FROM_EQE;
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dim->event_ctr = 0;
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@ -1461,6 +1425,25 @@ static void bcm_sysport_init_dim(struct bcm_sysport_net_dim *dim,
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dim->bytes = 0;
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}
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static void bcm_sysport_init_rx_coalesce(struct bcm_sysport_priv *priv)
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{
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struct bcm_sysport_net_dim *dim = &priv->dim;
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struct net_dim_cq_moder moder;
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u32 usecs, pkts;
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usecs = priv->rx_coalesce_usecs;
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pkts = priv->rx_max_coalesced_frames;
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/* If DIM was enabled, re-apply default parameters */
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if (dim->use_dim) {
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moder = net_dim_get_def_profile(dim->dim.mode);
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usecs = moder.usec;
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pkts = moder.pkts;
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}
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bcm_sysport_set_rx_coalesce(priv, usecs, pkts);
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}
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static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,
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unsigned int index)
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{
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@ -1551,7 +1534,6 @@ static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,
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reg |= (1 << index);
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tdma_writel(priv, reg, TDMA_TIER1_ARB_0_QUEUE_EN);
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bcm_sysport_init_dim(&ring->dim, bcm_sysport_dim_tx_work);
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napi_enable(&ring->napi);
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netif_dbg(priv, hw, priv->netdev,
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@ -1582,7 +1564,6 @@ static void bcm_sysport_fini_tx_ring(struct bcm_sysport_priv *priv,
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return;
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napi_disable(&ring->napi);
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cancel_work_sync(&ring->dim.dim.work);
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netif_napi_del(&ring->napi);
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bcm_sysport_tx_clean(priv, ring);
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@ -1703,8 +1684,6 @@ static int bcm_sysport_init_rx_ring(struct bcm_sysport_priv *priv)
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rdma_writel(priv, 0, RDMA_END_ADDR_HI);
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rdma_writel(priv, priv->num_rx_desc_words - 1, RDMA_END_ADDR_LO);
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rdma_writel(priv, 1, RDMA_MBDONE_INTR);
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netif_dbg(priv, hw, priv->netdev,
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"RDMA cfg, num_rx_bds=%d, rx_bds=%p\n",
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priv->num_rx_bds, priv->rx_bds);
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@ -1872,7 +1851,8 @@ static void bcm_sysport_netif_start(struct net_device *dev)
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struct bcm_sysport_priv *priv = netdev_priv(dev);
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/* Enable NAPI */
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bcm_sysport_init_dim(&priv->dim, bcm_sysport_dim_work);
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bcm_sysport_init_dim(priv, bcm_sysport_dim_work);
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bcm_sysport_init_rx_coalesce(priv);
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napi_enable(&priv->napi);
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/* Enable RX interrupt and TX ring full interrupt */
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@ -2378,6 +2358,7 @@ static int bcm_sysport_probe(struct platform_device *pdev)
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/* libphy will adjust the link state accordingly */
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netif_carrier_off(dev);
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priv->rx_max_coalesced_frames = 1;
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u64_stats_init(&priv->syncp);
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priv->dsa_notifier.notifier_call = bcm_sysport_dsa_notifier;
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@ -701,8 +701,6 @@ struct bcm_sysport_net_dim {
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u16 event_ctr;
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unsigned long packets;
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unsigned long bytes;
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u32 coal_usecs;
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u32 coal_pkts;
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struct net_dim dim;
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};
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@ -723,7 +721,6 @@ struct bcm_sysport_tx_ring {
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struct bcm_sysport_priv *priv; /* private context backpointer */
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unsigned long packets; /* packets statistics */
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unsigned long bytes; /* bytes statistics */
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struct bcm_sysport_net_dim dim; /* Net DIM context */
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unsigned int switch_queue; /* switch port queue number */
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unsigned int switch_port; /* switch port queue number */
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bool inspect; /* inspect switch port and queue */
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@ -756,6 +753,8 @@ struct bcm_sysport_priv {
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unsigned int rx_c_index;
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struct bcm_sysport_net_dim dim;
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u32 rx_max_coalesced_frames;
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u32 rx_coalesce_usecs;
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/* PHY device */
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struct device_node *phy_dn;
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@ -625,26 +625,46 @@ static int bcmgenet_get_coalesce(struct net_device *dev,
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return 0;
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}
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static void bcmgenet_set_rx_coalesce(struct bcmgenet_rx_ring *ring)
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static void bcmgenet_set_rx_coalesce(struct bcmgenet_rx_ring *ring,
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u32 usecs, u32 pkts)
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{
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struct bcmgenet_priv *priv = ring->priv;
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unsigned int i = ring->index;
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u32 reg;
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bcmgenet_rdma_ring_writel(priv, i, ring->dim.coal_pkts,
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DMA_MBUF_DONE_THRESH);
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bcmgenet_rdma_ring_writel(priv, i, pkts, DMA_MBUF_DONE_THRESH);
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reg = bcmgenet_rdma_readl(priv, DMA_RING0_TIMEOUT + i);
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reg &= ~DMA_TIMEOUT_MASK;
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reg |= DIV_ROUND_UP(ring->dim.coal_usecs * 1000, 8192);
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reg |= DIV_ROUND_UP(usecs * 1000, 8192);
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bcmgenet_rdma_writel(priv, reg, DMA_RING0_TIMEOUT + i);
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}
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static void bcmgenet_set_ring_rx_coalesce(struct bcmgenet_rx_ring *ring,
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struct ethtool_coalesce *ec)
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{
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struct net_dim_cq_moder moder;
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u32 usecs, pkts;
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ring->rx_coalesce_usecs = ec->rx_coalesce_usecs;
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ring->rx_max_coalesced_frames = ec->rx_max_coalesced_frames;
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usecs = ring->rx_coalesce_usecs;
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pkts = ring->rx_max_coalesced_frames;
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if (ec->use_adaptive_rx_coalesce && !ring->dim.use_dim) {
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moder = net_dim_get_def_profile(ring->dim.dim.mode);
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usecs = moder.usec;
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pkts = moder.pkts;
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}
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ring->dim.use_dim = ec->use_adaptive_rx_coalesce;
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bcmgenet_set_rx_coalesce(ring, usecs, pkts);
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}
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static int bcmgenet_set_coalesce(struct net_device *dev,
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struct ethtool_coalesce *ec)
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{
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struct bcmgenet_priv *priv = netdev_priv(dev);
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struct bcmgenet_rx_ring *ring;
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unsigned int i;
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/* Base system clock is 125Mhz, DMA timeout is this reference clock
|
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@ -680,27 +700,9 @@ static int bcmgenet_set_coalesce(struct net_device *dev,
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ec->tx_max_coalesced_frames,
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DMA_MBUF_DONE_THRESH);
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for (i = 0; i < priv->hw_params->rx_queues; i++) {
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ring = &priv->rx_rings[i];
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ring->dim.coal_usecs = ec->rx_coalesce_usecs;
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ring->dim.coal_pkts = ec->rx_max_coalesced_frames;
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if (!ec->use_adaptive_rx_coalesce && ring->dim.use_dim) {
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ring->dim.coal_pkts = 1;
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ring->dim.coal_usecs = 0;
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}
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ring->dim.use_dim = ec->use_adaptive_rx_coalesce;
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bcmgenet_set_rx_coalesce(ring);
|
||||
}
|
||||
|
||||
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->dim.use_dim = ec->use_adaptive_rx_coalesce;
|
||||
bcmgenet_set_rx_coalesce(ring);
|
||||
for (i = 0; i < priv->hw_params->rx_queues; i++)
|
||||
bcmgenet_set_ring_rx_coalesce(&priv->rx_rings[i], ec);
|
||||
bcmgenet_set_ring_rx_coalesce(&priv->rx_rings[DESC_INDEX], ec);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -1924,10 +1926,7 @@ 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;
|
||||
}
|
||||
|
||||
@ -2079,9 +2078,11 @@ 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;
|
||||
|
||||
INIT_WORK(&dim->dim.work, cb);
|
||||
dim->dim.mode = NET_DIM_CQ_PERIOD_MODE_START_FROM_EQE;
|
||||
dim->event_ctr = 0;
|
||||
@ -2089,6 +2090,25 @@ static void bcmgenet_init_dim(struct bcmgenet_net_dim *dim,
|
||||
dim->bytes = 0;
|
||||
}
|
||||
|
||||
static void bcmgenet_init_rx_coalesce(struct bcmgenet_rx_ring *ring)
|
||||
{
|
||||
struct bcmgenet_net_dim *dim = &ring->dim;
|
||||
struct net_dim_cq_moder moder;
|
||||
u32 usecs, pkts;
|
||||
|
||||
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 */
|
||||
static void bcmgenet_init_tx_ring(struct bcmgenet_priv *priv,
|
||||
unsigned int index, unsigned int size,
|
||||
@ -2178,7 +2198,8 @@ 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);
|
||||
bcmgenet_init_rx_coalesce(ring);
|
||||
|
||||
/* Initialize Rx NAPI */
|
||||
netif_napi_add(priv->dev, &ring->napi, bcmgenet_rx_poll,
|
||||
@ -2186,7 +2207,6 @@ 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 +3444,7 @@ 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 +3573,11 @@ 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);
|
||||
|
||||
|
||||
@ -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;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user