From ae0e6a5d16271f3a773bded360fa0eb0bdd25b10 Mon Sep 17 00:00:00 2001 From: Claudiu Manoil Date: Tue, 21 Jul 2020 10:55:22 +0300 Subject: [PATCH] enetc: Add adaptive interrupt coalescing Use the generic dynamic interrupt moderation (dim) framework to implement adaptive interrupt coalescing on Rx. With the per-packet interrupt scheme, a high interrupt rate has been noted for moderate traffic flows leading to high CPU utilization. The 'dim' scheme implemented by the current patch addresses this issue improving CPU utilization while using minimal coalescing time thresholds in order to preserve a good latency. On the Tx side use an optimal time threshold value by default. This value has been optimized for Tx TCP streams at a rate of around 85kpps on a 1G link, at which rate half of the Tx ring size (128) gets filled in 1500 usecs. Scaling this down to 2.5G links yields the current value of 600 usecs, which is conservative and gives good enough results for 1G links too (see next). Below are some measurement results for before and after this patch (and related dependencies) basically, for a 2 ARM Cortex-A72 @1.3Ghz CPUs system (32 KB L1 data cache), using 60secs log netperf TCP stream tests @ 1Gbit link (maximum throughput): 1) 1 Rx TCP flow, both Rx and Tx processed by the same NAPI thread on the same CPU: CPU utilization int rate (ints/sec) Before: 50%-60% (over 50%) 92k After: 13%-22% 3.5k-12k Comment: Major CPU utilization improvement for a single flow Rx TCP flow (i.e. netperf -t TCP_MAERTS) on a single CPU. Usually settles under 16% for longer tests. 2) 4 Rx TCP flows + 4 Tx TCP flows (+ pings to check the latency): Total CPU utilization Total int rate (ints/sec) Before: ~80% (spikes to 90%) ~100k After: 60% (more steady) ~4k Comment: Important improvement for this load test, while the ping test outcome does not show any notable difference compared to before. Signed-off-by: Claudiu Manoil Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/enetc/Kconfig | 2 + drivers/net/ethernet/freescale/enetc/enetc.c | 48 +++++++++++++++++++++- drivers/net/ethernet/freescale/enetc/enetc.h | 11 ++++- .../net/ethernet/freescale/enetc/enetc_ethtool.c | 19 +++++++-- 4 files changed, 73 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/freescale/enetc/Kconfig b/drivers/net/ethernet/freescale/enetc/Kconfig index 2b43848..37b804f 100644 --- a/drivers/net/ethernet/freescale/enetc/Kconfig +++ b/drivers/net/ethernet/freescale/enetc/Kconfig @@ -4,6 +4,7 @@ config FSL_ENETC depends on PCI && PCI_MSI select FSL_ENETC_MDIO select PHYLIB + select DIMLIB help This driver supports NXP ENETC gigabit ethernet controller PCIe physical function (PF) devices, managing ENETC Ports at a privileged @@ -15,6 +16,7 @@ config FSL_ENETC_VF tristate "ENETC VF driver" depends on PCI && PCI_MSI select PHYLIB + select DIMLIB help This driver supports NXP ENETC gigabit ethernet controller PCIe virtual function (VF) devices enabled by the ENETC PF driver. diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c index f4593c0..f50353c 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc.c +++ b/drivers/net/ethernet/freescale/enetc/enetc.c @@ -279,6 +279,34 @@ static bool enetc_clean_tx_ring(struct enetc_bdr *tx_ring, int napi_budget); static int enetc_clean_rx_ring(struct enetc_bdr *rx_ring, struct napi_struct *napi, int work_limit); +static void enetc_rx_dim_work(struct work_struct *w) +{ + struct dim *dim = container_of(w, struct dim, work); + struct dim_cq_moder moder = + net_dim_get_rx_moderation(dim->mode, dim->profile_ix); + struct enetc_int_vector *v = + container_of(dim, struct enetc_int_vector, rx_dim); + + v->rx_ictt = enetc_usecs_to_cycles(moder.usec); + dim->state = DIM_START_MEASURE; +} + +static void enetc_rx_net_dim(struct enetc_int_vector *v) +{ + struct dim_sample dim_sample; + + v->comp_cnt++; + + if (!v->rx_napi_work) + return; + + dim_update_sample(v->comp_cnt, + v->rx_ring.stats.packets, + v->rx_ring.stats.bytes, + &dim_sample); + net_dim(&v->rx_dim, dim_sample); +} + static int enetc_poll(struct napi_struct *napi, int budget) { struct enetc_int_vector @@ -294,12 +322,19 @@ static int enetc_poll(struct napi_struct *napi, int budget) work_done = enetc_clean_rx_ring(&v->rx_ring, napi, budget); if (work_done == budget) complete = false; + if (work_done) + v->rx_napi_work = true; if (!complete) return budget; napi_complete_done(napi, work_done); + if (likely(v->rx_dim_en)) + enetc_rx_net_dim(v); + + v->rx_napi_work = false; + /* enable interrupts */ enetc_wr_reg(v->rbier, ENETC_RBIER_RXTIE); @@ -1075,6 +1110,8 @@ void enetc_init_si_rings_params(struct enetc_ndev_priv *priv) priv->num_rx_rings = min_t(int, cpus, si->num_rx_rings); priv->num_tx_rings = si->num_tx_rings; priv->bdr_int_num = cpus; + priv->ic_mode = ENETC_IC_RX_ADAPTIVE | ENETC_IC_TX_MANUAL; + priv->tx_ictt = ENETC_TXIC_TIMETHR; /* SI specific */ si->cbd_ring.bd_count = ENETC_CBDR_DEFAULT_SIZE; @@ -1316,7 +1353,8 @@ static void enetc_setup_interrupts(struct enetc_ndev_priv *priv) int i; /* enable Tx & Rx event indication */ - if (priv->ic_mode & ENETC_IC_RX_MANUAL) { + if (priv->ic_mode & + (ENETC_IC_RX_MANUAL | ENETC_IC_RX_ADAPTIVE)) { icpt = ENETC_RBICR0_SET_ICPT(ENETC_RXIC_PKTTHR); /* init to non-0 minimum, will be adjusted later */ ictt = 0x1; @@ -1786,6 +1824,12 @@ int enetc_alloc_msix(struct enetc_ndev_priv *priv) priv->int_vector[i] = v; + /* init defaults for adaptive IC */ + if (priv->ic_mode & ENETC_IC_RX_ADAPTIVE) { + v->rx_ictt = 0x1; + v->rx_dim_en = true; + } + INIT_WORK(&v->rx_dim.work, enetc_rx_dim_work); netif_napi_add(priv->ndev, &v->napi, enetc_poll, NAPI_POLL_WEIGHT); v->count_tx_rings = v_tx_rings; @@ -1821,6 +1865,7 @@ int enetc_alloc_msix(struct enetc_ndev_priv *priv) fail: while (i--) { netif_napi_del(&priv->int_vector[i]->napi); + cancel_work_sync(&priv->int_vector[i]->rx_dim.work); kfree(priv->int_vector[i]); } @@ -1837,6 +1882,7 @@ void enetc_free_msix(struct enetc_ndev_priv *priv) struct enetc_int_vector *v = priv->int_vector[i]; netif_napi_del(&v->napi); + cancel_work_sync(&v->rx_dim.work); } for (i = 0; i < priv->num_rx_rings; i++) diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h index 4e3af7f..d309803 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc.h +++ b/drivers/net/ethernet/freescale/enetc/enetc.h @@ -10,6 +10,7 @@ #include #include #include +#include #include "enetc_hw.h" @@ -194,12 +195,15 @@ struct enetc_int_vector { unsigned long tx_rings_map; int count_tx_rings; u32 rx_ictt; - struct napi_struct napi; + u16 comp_cnt; + bool rx_dim_en, rx_napi_work; + struct napi_struct napi ____cacheline_aligned_in_smp; + struct dim rx_dim ____cacheline_aligned_in_smp; char name[ENETC_INT_NAME_MAX]; struct enetc_bdr rx_ring; struct enetc_bdr tx_ring[]; -}; +} ____cacheline_aligned_in_smp; struct enetc_cls_rule { struct ethtool_rx_flow_spec fs; @@ -230,10 +234,13 @@ enum enetc_ic_mode { /* activated when int coalescing time is set to a non-0 value */ ENETC_IC_RX_MANUAL = BIT(0), ENETC_IC_TX_MANUAL = BIT(1), + /* use dynamic interrupt moderation */ + ENETC_IC_RX_ADAPTIVE = BIT(2), }; #define ENETC_RXIC_PKTTHR min_t(u32, 256, ENETC_RX_RING_DEFAULT_SIZE / 2) #define ENETC_TXIC_PKTTHR min_t(u32, 128, ENETC_TX_RING_DEFAULT_SIZE / 2) +#define ENETC_TXIC_TIMETHR enetc_usecs_to_cycles(600) struct enetc_ndev_priv { struct net_device *ndev; diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c index 521f3b4..1dab83f 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c @@ -575,6 +575,8 @@ static int enetc_get_coalesce(struct net_device *ndev, ic->tx_max_coalesced_frames = ENETC_TXIC_PKTTHR; ic->rx_max_coalesced_frames = ENETC_RXIC_PKTTHR; + ic->use_adaptive_rx_coalesce = priv->ic_mode & ENETC_IC_RX_ADAPTIVE; + return 0; } @@ -596,11 +598,17 @@ static int enetc_set_coalesce(struct net_device *ndev, return -EOPNOTSUPP; ic_mode = ENETC_IC_NONE; + if (ic->use_adaptive_rx_coalesce) { + ic_mode |= ENETC_IC_RX_ADAPTIVE; + rx_ictt = 0x1; + } else { + ic_mode |= rx_ictt ? ENETC_IC_RX_MANUAL : 0; + } + ic_mode |= tx_ictt ? ENETC_IC_TX_MANUAL : 0; - ic_mode |= rx_ictt ? ENETC_IC_RX_MANUAL : 0; /* commit the settings */ - changed = (ic_mode != priv->ic_mode); + changed = (ic_mode != priv->ic_mode) || (priv->tx_ictt != tx_ictt); priv->ic_mode = ic_mode; priv->tx_ictt = tx_ictt; @@ -609,6 +617,7 @@ static int enetc_set_coalesce(struct net_device *ndev, struct enetc_int_vector *v = priv->int_vector[i]; v->rx_ictt = rx_ictt; + v->rx_dim_en = !!(ic_mode & ENETC_IC_RX_ADAPTIVE); } if (netif_running(ndev) && changed) { @@ -679,7 +688,8 @@ static int enetc_set_wol(struct net_device *dev, static const struct ethtool_ops enetc_pf_ethtool_ops = { .supported_coalesce_params = ETHTOOL_COALESCE_USECS | - ETHTOOL_COALESCE_MAX_FRAMES, + ETHTOOL_COALESCE_MAX_FRAMES | + ETHTOOL_COALESCE_USE_ADAPTIVE_RX, .get_regs_len = enetc_get_reglen, .get_regs = enetc_get_regs, .get_sset_count = enetc_get_sset_count, @@ -704,7 +714,8 @@ static const struct ethtool_ops enetc_pf_ethtool_ops = { static const struct ethtool_ops enetc_vf_ethtool_ops = { .supported_coalesce_params = ETHTOOL_COALESCE_USECS | - ETHTOOL_COALESCE_MAX_FRAMES, + ETHTOOL_COALESCE_MAX_FRAMES | + ETHTOOL_COALESCE_USE_ADAPTIVE_RX, .get_regs_len = enetc_get_reglen, .get_regs = enetc_get_regs, .get_sset_count = enetc_get_sset_count, -- 2.7.4