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Message-Id: <20210415003013.19717-5-anthony.l.nguyen@intel.com>
Date: Wed, 14 Apr 2021 17:30:02 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net, kuba@...nel.org
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>,
netdev@...r.kernel.org, sassmann@...hat.com,
anthony.l.nguyen@...el.com,
Tony Brelinski <tonyx.brelinski@...el.com>
Subject: [PATCH net-next 04/15] ice: refactor interrupt moderation writes
From: Jesse Brandeburg <jesse.brandeburg@...el.com>
Introduce several new helpers for writing ITR and GLINT_RATE
registers, and refactor the code calling them. This resulted
in removal of several duplicate functions and rolled a bunch
of simple code back into the calling routines.
In particular this removes some code that was doing both
a store and a set in a helper function, which seems better
done as separate tasks in the caller (and generally takes
less lines of code even with a tiny bit of repetition).
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Tested-by: Tony Brelinski <tonyx.brelinski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
drivers/net/ethernet/intel/ice/ice_base.c | 22 +--
drivers/net/ethernet/intel/ice/ice_ethtool.c | 17 +-
drivers/net/ethernet/intel/ice/ice_lib.c | 171 ++++++++++---------
drivers/net/ethernet/intel/ice/ice_lib.h | 3 +-
drivers/net/ethernet/intel/ice/ice_xsk.c | 3 -
5 files changed, 112 insertions(+), 104 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
index be26775a7dfe..21eb5d447d31 100644
--- a/drivers/net/ethernet/intel/ice/ice_base.c
+++ b/drivers/net/ethernet/intel/ice/ice_base.c
@@ -740,25 +740,13 @@ void ice_cfg_itr(struct ice_hw *hw, struct ice_q_vector *q_vector)
{
ice_cfg_itr_gran(hw);
- if (q_vector->num_ring_rx) {
- struct ice_ring_container *rc = &q_vector->rx;
-
- rc->target_itr = ITR_TO_REG(rc->itr_setting);
- rc->next_update = jiffies + 1;
- rc->current_itr = rc->target_itr;
- wr32(hw, GLINT_ITR(rc->itr_idx, q_vector->reg_idx),
- ITR_REG_ALIGN(rc->current_itr) >> ICE_ITR_GRAN_S);
- }
+ if (q_vector->num_ring_rx)
+ ice_write_itr(&q_vector->rx, q_vector->rx.itr_setting);
- if (q_vector->num_ring_tx) {
- struct ice_ring_container *rc = &q_vector->tx;
+ if (q_vector->num_ring_tx)
+ ice_write_itr(&q_vector->tx, q_vector->tx.itr_setting);
- rc->target_itr = ITR_TO_REG(rc->itr_setting);
- rc->next_update = jiffies + 1;
- rc->current_itr = rc->target_itr;
- wr32(hw, GLINT_ITR(rc->itr_idx, q_vector->reg_idx),
- ITR_REG_ALIGN(rc->current_itr) >> ICE_ITR_GRAN_S);
- }
+ ice_write_intrl(q_vector, q_vector->intrl);
}
/**
diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index f2bc8f1e86cc..e273560d9e6e 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -3636,9 +3636,8 @@ ice_set_rc_coalesce(enum ice_container_type c_type, struct ethtool_coalesce *ec,
}
if (ec->rx_coalesce_usecs_high != rc->ring->q_vector->intrl) {
rc->ring->q_vector->intrl = ec->rx_coalesce_usecs_high;
- wr32(&pf->hw, GLINT_RATE(rc->ring->q_vector->reg_idx),
- ice_intrl_usec_to_reg(ec->rx_coalesce_usecs_high,
- pf->hw.intrl_gran));
+ ice_write_intrl(rc->ring->q_vector,
+ ec->rx_coalesce_usecs_high);
}
use_adaptive_coalesce = ec->use_adaptive_rx_coalesce;
@@ -3672,10 +3671,15 @@ ice_set_rc_coalesce(enum ice_container_type c_type, struct ethtool_coalesce *ec,
if (use_adaptive_coalesce) {
rc->itr_setting |= ICE_ITR_DYNAMIC;
} else {
- /* save the user set usecs */
+ /* store user facing value how it was set */
rc->itr_setting = coalesce_usecs;
- /* device ITR granularity is in 2 usec increments */
- rc->target_itr = ITR_REG_ALIGN(rc->itr_setting);
+ /* write the change to the register */
+ ice_write_itr(rc, coalesce_usecs);
+ /* force writes to take effect immediately, the flush shouldn't
+ * be done in the functions above because the intent is for
+ * them to do lazy writes.
+ */
+ ice_flush(&pf->hw);
}
return 0;
@@ -3793,7 +3797,6 @@ __ice_set_coalesce(struct net_device *netdev, struct ethtool_coalesce *ec,
return -EINVAL;
set_complete:
-
return 0;
}
diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index 40a9b034d73b..bb47376386f4 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -1773,7 +1773,7 @@ int ice_vsi_cfg_xdp_txqs(struct ice_vsi *vsi)
* This function converts a decimal interrupt rate limit in usecs to the format
* expected by firmware.
*/
-u32 ice_intrl_usec_to_reg(u8 intrl, u8 gran)
+static u32 ice_intrl_usec_to_reg(u8 intrl, u8 gran)
{
u32 val = intrl / gran;
@@ -1782,6 +1782,58 @@ u32 ice_intrl_usec_to_reg(u8 intrl, u8 gran)
return 0;
}
+/**
+ * ice_write_intrl - write throttle rate limit to interrupt specific register
+ * @q_vector: pointer to interrupt specific structure
+ * @intrl: throttle rate limit in microseconds to write
+ */
+void ice_write_intrl(struct ice_q_vector *q_vector, u8 intrl)
+{
+ struct ice_hw *hw = &q_vector->vsi->back->hw;
+
+ wr32(hw, GLINT_RATE(q_vector->reg_idx),
+ ice_intrl_usec_to_reg(intrl, ICE_INTRL_GRAN_ABOVE_25));
+}
+
+/**
+ * __ice_write_itr - write throttle rate to register
+ * @q_vector: pointer to interrupt data structure
+ * @rc: pointer to ring container
+ * @itr: throttle rate in microseconds to write
+ */
+static void __ice_write_itr(struct ice_q_vector *q_vector,
+ struct ice_ring_container *rc, u16 itr)
+{
+ struct ice_hw *hw = &q_vector->vsi->back->hw;
+
+ wr32(hw, GLINT_ITR(rc->itr_idx, q_vector->reg_idx),
+ ITR_REG_ALIGN(itr) >> ICE_ITR_GRAN_S);
+}
+
+/**
+ * ice_write_itr - write throttle rate to queue specific register
+ * @rc: pointer to ring container
+ * @itr: throttle rate in microseconds to write
+ *
+ * This function is resilient to having the 0x8000 bit set which
+ * is indicating that an ITR value is "DYNAMIC", and will write
+ * the correct value to the register.
+ */
+void ice_write_itr(struct ice_ring_container *rc, u16 itr)
+{
+ struct ice_q_vector *q_vector;
+
+ if (!rc->ring)
+ return;
+
+ q_vector = rc->ring->q_vector;
+
+ /* clear the "DYNAMIC" bit */
+ itr = ITR_TO_REG(itr);
+
+ __ice_write_itr(q_vector, rc, itr);
+}
+
/**
* ice_vsi_cfg_msix - MSIX mode Interrupt Config in the HW
* @vsi: the VSI being configured
@@ -1802,9 +1854,6 @@ void ice_vsi_cfg_msix(struct ice_vsi *vsi)
ice_cfg_itr(hw, q_vector);
- wr32(hw, GLINT_RATE(reg_idx),
- ice_intrl_usec_to_reg(q_vector->intrl, hw->intrl_gran));
-
/* Both Transmit Queue Interrupt Cause Control register
* and Receive Queue Interrupt Cause control register
* expects MSIX_INDX field to be the vector index
@@ -2492,11 +2541,10 @@ static void ice_vsi_release_msix(struct ice_vsi *vsi)
for (i = 0; i < vsi->num_q_vectors; i++) {
struct ice_q_vector *q_vector = vsi->q_vectors[i];
- u16 reg_idx = q_vector->reg_idx;
- wr32(hw, GLINT_ITR(ICE_IDX_ITR0, reg_idx), 0);
- wr32(hw, GLINT_ITR(ICE_IDX_ITR1, reg_idx), 0);
+ ice_write_intrl(q_vector, 0);
for (q = 0; q < q_vector->num_ring_tx; q++) {
+ ice_write_itr(&q_vector->tx, 0);
wr32(hw, QINT_TQCTL(vsi->txq_map[txq]), 0);
if (ice_is_xdp_ena_vsi(vsi)) {
u32 xdp_txq = txq + vsi->num_xdp_txq;
@@ -2507,6 +2555,7 @@ static void ice_vsi_release_msix(struct ice_vsi *vsi)
}
for (q = 0; q < q_vector->num_ring_rx; q++) {
+ ice_write_itr(&q_vector->rx, 0);
wr32(hw, QINT_RQCTL(vsi->rxq_map[rxq]), 0);
rxq++;
}
@@ -2843,47 +2892,6 @@ int ice_vsi_release(struct ice_vsi *vsi)
return 0;
}
-/**
- * ice_vsi_rebuild_update_coalesce_intrl - set interrupt rate limit for a q_vector
- * @q_vector: pointer to q_vector which is being updated
- * @stored_intrl_setting: original INTRL setting
- *
- * Set coalesce param in q_vector and update these parameters in HW.
- */
-static void
-ice_vsi_rebuild_update_coalesce_intrl(struct ice_q_vector *q_vector,
- u16 stored_intrl_setting)
-{
- struct ice_hw *hw = &q_vector->vsi->back->hw;
-
- q_vector->intrl = stored_intrl_setting;
- wr32(hw, GLINT_RATE(q_vector->reg_idx),
- ice_intrl_usec_to_reg(q_vector->intrl, hw->intrl_gran));
-}
-
-/**
- * ice_vsi_rebuild_update_coalesce_itr - set coalesce for a q_vector
- * @q_vector: pointer to q_vector which is being updated
- * @rc: pointer to ring container
- * @stored_itr_setting: original ITR setting
- *
- * Set coalesce param in q_vector and update these parameters in HW.
- */
-static void
-ice_vsi_rebuild_update_coalesce_itr(struct ice_q_vector *q_vector,
- struct ice_ring_container *rc,
- u16 stored_itr_setting)
-{
- struct ice_hw *hw = &q_vector->vsi->back->hw;
-
- rc->itr_setting = stored_itr_setting;
-
- /* dynamic ITR values will be updated during Tx/Rx */
- if (!ITR_IS_DYNAMIC(rc->itr_setting))
- wr32(hw, GLINT_ITR(rc->itr_idx, q_vector->reg_idx),
- ITR_REG_ALIGN(rc->itr_setting) >> ICE_ITR_GRAN_S);
-}
-
/**
* ice_vsi_rebuild_get_coalesce - get coalesce from all q_vectors
* @vsi: VSI connected with q_vectors
@@ -2927,6 +2935,7 @@ static void
ice_vsi_rebuild_set_coalesce(struct ice_vsi *vsi,
struct ice_coalesce_stored *coalesce, int size)
{
+ struct ice_ring_container *rc;
int i;
if ((size && !coalesce) || !vsi)
@@ -2949,41 +2958,51 @@ ice_vsi_rebuild_set_coalesce(struct ice_vsi *vsi,
* rings is less than are allocated (this means the number of
* rings increased from previously), then write out the
* values in the first element
+ *
+ * Also, always write the ITR, even if in ITR_IS_DYNAMIC
+ * as there is no harm because the dynamic algorithm
+ * will just overwrite.
*/
- if (i < vsi->alloc_rxq && coalesce[i].rx_valid)
- ice_vsi_rebuild_update_coalesce_itr(vsi->q_vectors[i],
- &vsi->q_vectors[i]->rx,
- coalesce[i].itr_rx);
- else if (i < vsi->alloc_rxq)
- ice_vsi_rebuild_update_coalesce_itr(vsi->q_vectors[i],
- &vsi->q_vectors[i]->rx,
- coalesce[0].itr_rx);
-
- if (i < vsi->alloc_txq && coalesce[i].tx_valid)
- ice_vsi_rebuild_update_coalesce_itr(vsi->q_vectors[i],
- &vsi->q_vectors[i]->tx,
- coalesce[i].itr_tx);
- else if (i < vsi->alloc_txq)
- ice_vsi_rebuild_update_coalesce_itr(vsi->q_vectors[i],
- &vsi->q_vectors[i]->tx,
- coalesce[0].itr_tx);
-
- ice_vsi_rebuild_update_coalesce_intrl(vsi->q_vectors[i],
- coalesce[i].intrl);
+ if (i < vsi->alloc_rxq && coalesce[i].rx_valid) {
+ rc = &vsi->q_vectors[i]->rx;
+ rc->itr_setting = coalesce[i].itr_rx;
+ ice_write_itr(rc, rc->itr_setting);
+ } else if (i < vsi->alloc_rxq) {
+ rc = &vsi->q_vectors[i]->rx;
+ rc->itr_setting = coalesce[0].itr_rx;
+ ice_write_itr(rc, rc->itr_setting);
+ }
+
+ if (i < vsi->alloc_txq && coalesce[i].tx_valid) {
+ rc = &vsi->q_vectors[i]->tx;
+ rc->itr_setting = coalesce[i].itr_tx;
+ ice_write_itr(rc, rc->itr_setting);
+ } else if (i < vsi->alloc_txq) {
+ rc = &vsi->q_vectors[i]->tx;
+ rc->itr_setting = coalesce[0].itr_tx;
+ ice_write_itr(rc, rc->itr_setting);
+ }
+
+ vsi->q_vectors[i]->intrl = coalesce[i].intrl;
+ ice_write_intrl(vsi->q_vectors[i], coalesce[i].intrl);
}
/* the number of queue vectors increased so write whatever is in
* the first element
*/
for (; i < vsi->num_q_vectors; i++) {
- ice_vsi_rebuild_update_coalesce_itr(vsi->q_vectors[i],
- &vsi->q_vectors[i]->tx,
- coalesce[0].itr_tx);
- ice_vsi_rebuild_update_coalesce_itr(vsi->q_vectors[i],
- &vsi->q_vectors[i]->rx,
- coalesce[0].itr_rx);
- ice_vsi_rebuild_update_coalesce_intrl(vsi->q_vectors[i],
- coalesce[0].intrl);
+ /* transmit */
+ rc = &vsi->q_vectors[i]->tx;
+ rc->itr_setting = coalesce[0].itr_tx;
+ ice_write_itr(rc, rc->itr_setting);
+
+ /* receive */
+ rc = &vsi->q_vectors[i]->rx;
+ rc->itr_setting = coalesce[0].itr_rx;
+ ice_write_itr(rc, rc->itr_setting);
+
+ vsi->q_vectors[i]->intrl = coalesce[0].intrl;
+ ice_write_intrl(vsi->q_vectors[i], coalesce[0].intrl);
}
}
diff --git a/drivers/net/ethernet/intel/ice/ice_lib.h b/drivers/net/ethernet/intel/ice/ice_lib.h
index 462c3ab7abad..f48c5ccb8036 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_lib.h
@@ -95,7 +95,8 @@ void ice_vsi_cfg_frame_size(struct ice_vsi *vsi);
int ice_status_to_errno(enum ice_status err);
-u32 ice_intrl_usec_to_reg(u8 intrl, u8 gran);
+void ice_write_intrl(struct ice_q_vector *q_vector, u8 intrl);
+void ice_write_itr(struct ice_ring_container *rc, u16 itr);
enum ice_status
ice_vsi_cfg_mac_fltr(struct ice_vsi *vsi, const u8 *macaddr, bool set);
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index b881b650af98..faa7b8d96adb 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -108,9 +108,6 @@ ice_qvec_cfg_msix(struct ice_vsi *vsi, struct ice_q_vector *q_vector)
ice_cfg_itr(hw, q_vector);
- wr32(hw, GLINT_RATE(reg_idx),
- ice_intrl_usec_to_reg(q_vector->intrl, hw->intrl_gran));
-
ice_for_each_ring(ring, q_vector->tx)
ice_cfg_txq_interrupt(vsi, ring->reg_idx, reg_idx,
q_vector->tx.itr_idx);
--
2.26.2
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