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Message-Id: <20200913212813.46736-1-snelson@pensando.io>
Date: Sun, 13 Sep 2020 14:28:13 -0700
From: Shannon Nelson <snelson@...sando.io>
To: netdev@...r.kernel.org, davem@...emloft.net
Cc: Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next] ionic: dynamic interrupt moderation
Use the dim library to manage dynamic interrupt
moderation in ionic.
Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
.../ethernet/pensando/ionic/ionic_debugfs.c | 2 +
.../net/ethernet/pensando/ionic/ionic_dev.h | 1 +
.../ethernet/pensando/ionic/ionic_ethtool.c | 71 ++++++++++++-------
.../net/ethernet/pensando/ionic/ionic_lif.c | 28 +++++++-
.../net/ethernet/pensando/ionic/ionic_lif.h | 5 +-
.../net/ethernet/pensando/ionic/ionic_main.c | 2 +-
.../net/ethernet/pensando/ionic/ionic_txrx.c | 33 ++++++++-
7 files changed, 111 insertions(+), 31 deletions(-)
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_debugfs.c b/drivers/net/ethernet/pensando/ionic/ionic_debugfs.c
index 683bbbf75115..39f59849720d 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_debugfs.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_debugfs.c
@@ -189,6 +189,8 @@ void ionic_debugfs_add_qcq(struct ionic_lif *lif, struct ionic_qcq *qcq)
&intr->index);
debugfs_create_u32("vector", 0400, intr_dentry,
&intr->vector);
+ debugfs_create_u32("dim_coal_hw", 0400, intr_dentry,
+ &intr->dim_coal_hw);
intr_ctrl_regset = devm_kzalloc(dev, sizeof(*intr_ctrl_regset),
GFP_KERNEL);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index 9e2ac2b8a082..32f28e0203e9 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -243,6 +243,7 @@ struct ionic_intr_info {
u64 rearm_count;
unsigned int cpu;
cpumask_t affinity_mask;
+ u32 dim_coal_hw;
};
struct ionic_cq {
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
index 00aad7168915..a454f060a01a 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
@@ -406,6 +406,13 @@ static int ionic_get_coalesce(struct net_device *netdev,
coalesce->tx_coalesce_usecs = lif->tx_coalesce_usecs;
coalesce->rx_coalesce_usecs = lif->rx_coalesce_usecs;
+ if (test_bit(IONIC_LIF_F_SPLIT_INTR, lif->state))
+ coalesce->use_adaptive_tx_coalesce = test_bit(IONIC_LIF_F_TX_DIM_INTR, lif->state);
+ else
+ coalesce->use_adaptive_tx_coalesce = 0;
+
+ coalesce->use_adaptive_rx_coalesce = test_bit(IONIC_LIF_F_RX_DIM_INTR, lif->state);
+
return 0;
}
@@ -414,10 +421,9 @@ static int ionic_set_coalesce(struct net_device *netdev,
{
struct ionic_lif *lif = netdev_priv(netdev);
struct ionic_identity *ident;
- struct ionic_qcq *qcq;
+ u32 rx_coal, rx_dim;
+ u32 tx_coal, tx_dim;
unsigned int i;
- u32 rx_coal;
- u32 tx_coal;
ident = &lif->ionic->ident;
if (ident->dev.intr_coal_div == 0) {
@@ -426,10 +432,11 @@ static int ionic_set_coalesce(struct net_device *netdev,
return -EIO;
}
- /* Tx normally shares Rx interrupt, so only change Rx */
+ /* Tx normally shares Rx interrupt, so only change Rx if not split */
if (!test_bit(IONIC_LIF_F_SPLIT_INTR, lif->state) &&
- coalesce->tx_coalesce_usecs != lif->rx_coalesce_usecs) {
- netdev_warn(netdev, "only the rx-usecs can be changed\n");
+ (coalesce->tx_coalesce_usecs != lif->rx_coalesce_usecs ||
+ coalesce->use_adaptive_tx_coalesce)) {
+ netdev_warn(netdev, "only rx parameters can be changed\n");
return -EINVAL;
}
@@ -449,32 +456,44 @@ static int ionic_set_coalesce(struct net_device *netdev,
/* Save the new values */
lif->rx_coalesce_usecs = coalesce->rx_coalesce_usecs;
- if (rx_coal != lif->rx_coalesce_hw) {
- lif->rx_coalesce_hw = rx_coal;
-
- if (test_bit(IONIC_LIF_F_UP, lif->state)) {
- for (i = 0; i < lif->nxqs; i++) {
- qcq = lif->rxqcqs[i];
- ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
- qcq->intr.index,
- lif->rx_coalesce_hw);
- }
- }
- }
+ lif->rx_coalesce_hw = rx_coal;
if (test_bit(IONIC_LIF_F_SPLIT_INTR, lif->state))
lif->tx_coalesce_usecs = coalesce->tx_coalesce_usecs;
else
lif->tx_coalesce_usecs = coalesce->rx_coalesce_usecs;
- if (tx_coal != lif->tx_coalesce_hw) {
- lif->tx_coalesce_hw = tx_coal;
+ lif->tx_coalesce_hw = tx_coal;
+
+ if (coalesce->use_adaptive_rx_coalesce) {
+ set_bit(IONIC_LIF_F_RX_DIM_INTR, lif->state);
+ rx_dim = rx_coal;
+ } else {
+ clear_bit(IONIC_LIF_F_RX_DIM_INTR, lif->state);
+ rx_dim = 0;
+ }
+
+ if (coalesce->use_adaptive_tx_coalesce) {
+ set_bit(IONIC_LIF_F_TX_DIM_INTR, lif->state);
+ tx_dim = tx_coal;
+ } else {
+ clear_bit(IONIC_LIF_F_TX_DIM_INTR, lif->state);
+ tx_dim = 0;
+ }
+
+ if (test_bit(IONIC_LIF_F_UP, lif->state)) {
+ for (i = 0; i < lif->nxqs; i++) {
+ if (lif->rxqcqs[i]->flags & IONIC_QCQ_F_INTR) {
+ ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
+ lif->rxqcqs[i]->intr.index,
+ lif->rx_coalesce_hw);
+ lif->rxqcqs[i]->intr.dim_coal_hw = rx_dim;
+ }
- if (test_bit(IONIC_LIF_F_UP, lif->state)) {
- for (i = 0; i < lif->nxqs; i++) {
- qcq = lif->txqcqs[i];
+ if (lif->txqcqs[i]->flags & IONIC_QCQ_F_INTR) {
ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
- qcq->intr.index,
+ lif->txqcqs[i]->intr.index,
lif->tx_coalesce_hw);
+ lif->txqcqs[i]->intr.dim_coal_hw = tx_dim;
}
}
}
@@ -850,7 +869,9 @@ static int ionic_nway_reset(struct net_device *netdev)
}
static const struct ethtool_ops ionic_ethtool_ops = {
- .supported_coalesce_params = ETHTOOL_COALESCE_USECS,
+ .supported_coalesce_params = ETHTOOL_COALESCE_USECS |
+ ETHTOOL_COALESCE_USE_ADAPTIVE_RX |
+ ETHTOOL_COALESCE_USE_ADAPTIVE_TX,
.get_drvinfo = ionic_get_drvinfo,
.get_regs_len = ionic_get_regs_len,
.get_regs = ionic_get_regs,
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 895e2113bd6b..f1c8ab439080 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -42,6 +42,19 @@ static int ionic_start_queues(struct ionic_lif *lif);
static void ionic_stop_queues(struct ionic_lif *lif);
static void ionic_lif_queue_identify(struct ionic_lif *lif);
+static void ionic_dim_work(struct work_struct *work)
+{
+ struct dim *dim = container_of(work, struct dim, work);
+ struct dim_cq_moder cur_moder =
+ net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
+ struct ionic_qcq *qcq = container_of(dim, struct ionic_qcq, dim);
+ u32 new_coal;
+
+ new_coal = ionic_coal_usec_to_hw(qcq->q.lif->ionic, cur_moder.usec);
+ qcq->intr.dim_coal_hw = new_coal ? new_coal : 1;
+ dim->state = DIM_START_MEASURE;
+}
+
static void ionic_lif_deferred_work(struct work_struct *work)
{
struct ionic_lif *lif = container_of(work, struct ionic_lif, deferred.work);
@@ -270,6 +283,7 @@ static int ionic_qcq_disable(struct ionic_qcq *qcq)
ctx.cmd.q_control.index, ctx.cmd.q_control.type);
if (qcq->flags & IONIC_QCQ_F_INTR) {
+ cancel_work_sync(&qcq->dim.work);
ionic_intr_mask(idev->intr_ctrl, qcq->intr.index,
IONIC_INTR_MASK_SET);
synchronize_irq(qcq->intr.vector);
@@ -542,6 +556,9 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
ionic_q_sg_map(&new->q, sg_base, sg_base_pa);
}
+ INIT_WORK(&new->dim.work, ionic_dim_work);
+ new->dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+
*qcq = new;
return 0;
@@ -1633,10 +1650,13 @@ static int ionic_txrx_alloc(struct ionic_lif *lif)
if (err)
goto err_out;
- if (flags & IONIC_QCQ_F_INTR)
+ if (flags & IONIC_QCQ_F_INTR) {
ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
lif->txqcqs[i]->intr.index,
lif->tx_coalesce_hw);
+ if (test_bit(IONIC_LIF_F_TX_DIM_INTR, lif->state))
+ lif->txqcqs[i]->intr.dim_coal_hw = lif->tx_coalesce_hw;
+ }
ionic_debugfs_add_qcq(lif, lif->txqcqs[i]);
}
@@ -1655,6 +1675,8 @@ static int ionic_txrx_alloc(struct ionic_lif *lif)
ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
lif->rxqcqs[i]->intr.index,
lif->rx_coalesce_hw);
+ if (test_bit(IONIC_LIF_F_RX_DIM_INTR, lif->state))
+ lif->rxqcqs[i]->intr.dim_coal_hw = lif->rx_coalesce_hw;
if (!test_bit(IONIC_LIF_F_SPLIT_INTR, lif->state))
ionic_link_qcq_interrupts(lif->rxqcqs[i],
@@ -2228,6 +2250,8 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
lif->txqcqs[i]->intr.index,
lif->tx_coalesce_hw);
+ if (test_bit(IONIC_LIF_F_TX_DIM_INTR, lif->state))
+ lif->txqcqs[i]->intr.dim_coal_hw = lif->tx_coalesce_hw;
} else {
lif->txqcqs[i]->flags &= ~IONIC_QCQ_F_INTR;
ionic_link_qcq_interrupts(lif->rxqcqs[i], lif->txqcqs[i]);
@@ -2355,6 +2379,8 @@ int ionic_lif_alloc(struct ionic *ionic)
lif->rx_coalesce_usecs);
lif->tx_coalesce_usecs = lif->rx_coalesce_usecs;
lif->tx_coalesce_hw = lif->rx_coalesce_hw;
+ set_bit(IONIC_LIF_F_RX_DIM_INTR, lif->state);
+ set_bit(IONIC_LIF_F_TX_DIM_INTR, lif->state);
snprintf(lif->name, sizeof(lif->name), "lif%u", lif->index);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index e1e6ff1a0918..95894a8ab830 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -4,6 +4,7 @@
#ifndef _IONIC_LIF_H_
#define _IONIC_LIF_H_
+#include <linux/dim.h>
#include <linux/pci.h>
#include "ionic_rx_filter.h"
@@ -66,6 +67,7 @@ struct ionic_qcq {
void *sg_base;
dma_addr_t sg_base_pa;
u32 sg_size;
+ struct dim dim;
struct ionic_queue q;
struct ionic_cq cq;
struct ionic_intr_info intr;
@@ -131,6 +133,8 @@ enum ionic_lif_state_flags {
IONIC_LIF_F_LINK_CHECK_REQUESTED,
IONIC_LIF_F_FW_RESET,
IONIC_LIF_F_SPLIT_INTR,
+ IONIC_LIF_F_TX_DIM_INTR,
+ IONIC_LIF_F_RX_DIM_INTR,
/* leave this as last */
IONIC_LIF_F_STATE_SIZE
@@ -288,7 +292,6 @@ static inline void debug_stats_napi_poll(struct ionic_qcq *qcq,
#define DEBUG_STATS_CQE_CNT(cq) ((cq)->compl_count++)
#define DEBUG_STATS_RX_BUFF_CNT(q) ((q)->lif->rxqstats[q->index].buffers_posted++)
-#define DEBUG_STATS_INTR_REARM(intr) ((intr)->rearm_count++)
#define DEBUG_STATS_TXQ_POST(q, dbell) debug_stats_txq_post(q, dbell)
#define DEBUG_STATS_NAPI_POLL(qcq, work_done) \
debug_stats_napi_poll(qcq, work_done)
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
index 2b72a51be1d0..b9ba801d150b 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
@@ -316,7 +316,7 @@ int ionic_napi(struct napi_struct *napi, int budget, ionic_cq_cb cb,
if (work_done < budget && napi_complete_done(napi, work_done)) {
flags |= IONIC_INTR_CRED_UNMASK;
- DEBUG_STATS_INTR_REARM(cq->bound_intr);
+ cq->bound_intr->rearm_count++;
}
if (work_done || flags) {
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
index c3291decd4c3..c22452ad6366 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
@@ -423,6 +423,30 @@ void ionic_rx_empty(struct ionic_queue *q)
}
}
+static void ionic_dim_update(struct ionic_qcq *qcq)
+{
+ struct dim_sample dim_sample;
+ struct ionic_lif *lif;
+ unsigned int qi;
+
+ if (!qcq->intr.dim_coal_hw)
+ return;
+
+ lif = qcq->q.lif;
+ qi = qcq->cq.bound_q->index;
+
+ ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
+ lif->rxqcqs[qi]->intr.index,
+ qcq->intr.dim_coal_hw);
+
+ dim_update_sample(qcq->cq.bound_intr->rearm_count,
+ lif->txqstats[qi].pkts,
+ lif->txqstats[qi].bytes,
+ &dim_sample);
+
+ net_dim(&qcq->dim, dim_sample);
+}
+
int ionic_tx_napi(struct napi_struct *napi, int budget)
{
struct ionic_qcq *qcq = napi_to_qcq(napi);
@@ -439,8 +463,9 @@ int ionic_tx_napi(struct napi_struct *napi, int budget)
ionic_tx_service, NULL, NULL);
if (work_done < budget && napi_complete_done(napi, work_done)) {
+ ionic_dim_update(qcq);
flags |= IONIC_INTR_CRED_UNMASK;
- DEBUG_STATS_INTR_REARM(cq->bound_intr);
+ cq->bound_intr->rearm_count++;
}
if (work_done || flags) {
@@ -474,8 +499,9 @@ int ionic_rx_napi(struct napi_struct *napi, int budget)
ionic_rx_fill(cq->bound_q);
if (work_done < budget && napi_complete_done(napi, work_done)) {
+ ionic_dim_update(qcq);
flags |= IONIC_INTR_CRED_UNMASK;
- DEBUG_STATS_INTR_REARM(cq->bound_intr);
+ cq->bound_intr->rearm_count++;
}
if (work_done || flags) {
@@ -519,8 +545,9 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
unmask = (rx_work_done < budget) && (tx_work_done < lif->tx_budget);
if (unmask && napi_complete_done(napi, rx_work_done)) {
+ ionic_dim_update(qcq);
flags |= IONIC_INTR_CRED_UNMASK;
- DEBUG_STATS_INTR_REARM(rxcq->bound_intr);
+ rxcq->bound_intr->rearm_count++;
work_done = rx_work_done;
} else {
work_done = budget;
--
2.17.1
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