*/
struct ixgbe_q_vector {
struct ixgbe_adapter *adapter;
- unsigned int v_idx; /* index of q_vector within array, also used for
- * finding the bit in EICR and friends that
- * represents the vector for this ring */
#ifdef CONFIG_IXGBE_DCA
int cpu; /* CPU for DCA */
#endif
- struct napi_struct napi;
+ u16 v_idx; /* index of q_vector within array, also used for
+ * finding the bit in EICR and friends that
+ * represents the vector for this ring */
+ u16 itr; /* Interrupt throttle rate written to EITR */
struct ixgbe_ring_container rx, tx;
- u32 eitr;
+
+ struct napi_struct napi;
cpumask_var_t affinity_mask;
char name[IFNAMSIZ + 9];
};
-/* Helper macros to switch between ints/sec and what the register uses.
- * And yes, it's the same math going both ways. The lowest value
- * supported by all of the ixgbe hardware is 8.
+/*
+ * microsecond values for various ITR rates shifted by 2 to fit itr register
+ * with the first 3 bits reserved 0
*/
-#define EITR_INTS_PER_SEC_TO_REG(_eitr) \
- ((_eitr) ? (1000000000 / ((_eitr) * 256)) : 8)
-#define EITR_REG_TO_INTS_PER_SEC EITR_INTS_PER_SEC_TO_REG
+#define IXGBE_MIN_RSC_ITR 24
+#define IXGBE_100K_ITR 40
+#define IXGBE_20K_ITR 200
+#define IXGBE_10K_ITR 400
+#define IXGBE_8K_ITR 500
static inline u16 ixgbe_desc_unused(struct ixgbe_ring *ring)
{
ec->tx_max_coalesced_frames_irq = adapter->tx_work_limit;
/* only valid if in constant ITR mode */
- switch (adapter->rx_itr_setting) {
- case 0:
- /* throttling disabled */
- ec->rx_coalesce_usecs = 0;
- break;
- case 1:
- /* dynamic ITR mode */
- ec->rx_coalesce_usecs = 1;
- break;
- default:
- /* fixed interrupt rate mode */
- ec->rx_coalesce_usecs = 1000000/adapter->rx_eitr_param;
- break;
- }
+ if (adapter->rx_itr_setting <= 1)
+ ec->rx_coalesce_usecs = adapter->rx_itr_setting;
+ else
+ ec->rx_coalesce_usecs = adapter->rx_itr_setting >> 2;
/* if in mixed tx/rx queues per vector mode, report only rx settings */
if (adapter->q_vector[0]->tx.count && adapter->q_vector[0]->rx.count)
return 0;
/* only valid if in constant ITR mode */
- switch (adapter->tx_itr_setting) {
- case 0:
- /* throttling disabled */
- ec->tx_coalesce_usecs = 0;
- break;
- case 1:
- /* dynamic ITR mode */
- ec->tx_coalesce_usecs = 1;
- break;
- default:
- ec->tx_coalesce_usecs = 1000000/adapter->tx_eitr_param;
- break;
- }
+ if (adapter->tx_itr_setting <= 1)
+ ec->tx_coalesce_usecs = adapter->tx_itr_setting;
+ else
+ ec->tx_coalesce_usecs = adapter->tx_itr_setting >> 2;
return 0;
}
/* if interrupt rate is too high then disable RSC */
if (ec->rx_coalesce_usecs != 1 &&
- ec->rx_coalesce_usecs <= 1000000/IXGBE_MAX_RSC_INT_RATE) {
+ ec->rx_coalesce_usecs <= (IXGBE_MIN_RSC_ITR >> 2)) {
if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED) {
- e_info(probe, "rx-usecs set too low, "
- "disabling RSC\n");
+ e_info(probe, "rx-usecs set too low, disabling RSC\n");
adapter->flags2 &= ~IXGBE_FLAG2_RSC_ENABLED;
return true;
}
/* check the feature flag value and enable RSC if necessary */
if ((netdev->features & NETIF_F_LRO) &&
!(adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)) {
- e_info(probe, "rx-usecs set to %d, "
- "re-enabling RSC\n",
+ e_info(probe, "rx-usecs set to %d, re-enabling RSC\n",
ec->rx_coalesce_usecs);
adapter->flags2 |= IXGBE_FLAG2_RSC_ENABLED;
return true;
struct ixgbe_adapter *adapter = netdev_priv(netdev);
struct ixgbe_q_vector *q_vector;
int i;
+ int num_vectors;
+ u16 tx_itr_param, rx_itr_param;
bool need_reset = false;
/* don't accept tx specific changes if we've got mixed RxTx vectors */
if (adapter->q_vector[0]->tx.count && adapter->q_vector[0]->rx.count
- && ec->tx_coalesce_usecs)
+ && ec->tx_coalesce_usecs)
return -EINVAL;
if (ec->tx_max_coalesced_frames_irq)
adapter->tx_work_limit = ec->tx_max_coalesced_frames_irq;
- if (ec->rx_coalesce_usecs > 1) {
- /* check the limits */
- if ((1000000/ec->rx_coalesce_usecs > IXGBE_MAX_INT_RATE) ||
- (1000000/ec->rx_coalesce_usecs < IXGBE_MIN_INT_RATE))
- return -EINVAL;
-
- /* check the old value and enable RSC if necessary */
- need_reset = ixgbe_update_rsc(adapter, ec);
-
- /* store the value in ints/second */
- adapter->rx_eitr_param = 1000000/ec->rx_coalesce_usecs;
+ if ((ec->rx_coalesce_usecs > (IXGBE_MAX_EITR >> 2)) ||
+ (ec->tx_coalesce_usecs > (IXGBE_MAX_EITR >> 2)))
+ return -EINVAL;
- /* static value of interrupt rate */
- adapter->rx_itr_setting = adapter->rx_eitr_param;
- /* clear the lower bit as its used for dynamic state */
- adapter->rx_itr_setting &= ~1;
- } else if (ec->rx_coalesce_usecs == 1) {
- /* check the old value and enable RSC if necessary */
- need_reset = ixgbe_update_rsc(adapter, ec);
+ /* check the old value and enable RSC if necessary */
+ need_reset = ixgbe_update_rsc(adapter, ec);
- /* 1 means dynamic mode */
- adapter->rx_eitr_param = 20000;
- adapter->rx_itr_setting = 1;
- } else {
- /* check the old value and enable RSC if necessary */
- need_reset = ixgbe_update_rsc(adapter, ec);
- /*
- * any other value means disable eitr, which is best
- * served by setting the interrupt rate very high
- */
- adapter->rx_eitr_param = IXGBE_MAX_INT_RATE;
- adapter->rx_itr_setting = 0;
- }
+ if (ec->rx_coalesce_usecs > 1)
+ adapter->rx_itr_setting = ec->rx_coalesce_usecs << 2;
+ else
+ adapter->rx_itr_setting = ec->rx_coalesce_usecs;
- if (ec->tx_coalesce_usecs > 1) {
- /*
- * don't have to worry about max_int as above because
- * tx vectors don't do hardware RSC (an rx function)
- */
- /* check the limits */
- if ((1000000/ec->tx_coalesce_usecs > IXGBE_MAX_INT_RATE) ||
- (1000000/ec->tx_coalesce_usecs < IXGBE_MIN_INT_RATE))
- return -EINVAL;
+ if (adapter->rx_itr_setting == 1)
+ rx_itr_param = IXGBE_20K_ITR;
+ else
+ rx_itr_param = adapter->rx_itr_setting;
- /* store the value in ints/second */
- adapter->tx_eitr_param = 1000000/ec->tx_coalesce_usecs;
+ if (ec->tx_coalesce_usecs > 1)
+ adapter->tx_itr_setting = ec->tx_coalesce_usecs << 2;
+ else
+ adapter->tx_itr_setting = ec->tx_coalesce_usecs;
- /* static value of interrupt rate */
- adapter->tx_itr_setting = adapter->tx_eitr_param;
+ if (adapter->tx_itr_setting == 1)
+ tx_itr_param = IXGBE_10K_ITR;
+ else
+ tx_itr_param = adapter->tx_itr_setting;
- /* clear the lower bit as its used for dynamic state */
- adapter->tx_itr_setting &= ~1;
- } else if (ec->tx_coalesce_usecs == 1) {
- /* 1 means dynamic mode */
- adapter->tx_eitr_param = 10000;
- adapter->tx_itr_setting = 1;
- } else {
- adapter->tx_eitr_param = IXGBE_MAX_INT_RATE;
- adapter->tx_itr_setting = 0;
- }
+ if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED)
+ num_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
+ else
+ num_vectors = 1;
- /* MSI/MSIx Interrupt Mode */
- if (adapter->flags &
- (IXGBE_FLAG_MSIX_ENABLED | IXGBE_FLAG_MSI_ENABLED)) {
- int num_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
- for (i = 0; i < num_vectors; i++) {
- q_vector = adapter->q_vector[i];
- if (q_vector->tx.count && !q_vector->rx.count)
- /* tx only */
- q_vector->eitr = adapter->tx_eitr_param;
- else
- /* rx only or mixed */
- q_vector->eitr = adapter->rx_eitr_param;
- q_vector->tx.work_limit = adapter->tx_work_limit;
- ixgbe_write_eitr(q_vector);
- }
- /* Legacy Interrupt Mode */
- } else {
- q_vector = adapter->q_vector[0];
- q_vector->eitr = adapter->rx_eitr_param;
+ for (i = 0; i < num_vectors; i++) {
+ q_vector = adapter->q_vector[i];
q_vector->tx.work_limit = adapter->tx_work_limit;
+ if (q_vector->tx.count && !q_vector->rx.count)
+ /* tx only */
+ q_vector->itr = tx_itr_param;
+ else
+ /* rx only or mixed */
+ q_vector->itr = rx_itr_param;
ixgbe_write_eitr(q_vector);
}
for (ring = q_vector->tx.ring; ring != NULL; ring = ring->next)
ixgbe_set_ivar(adapter, 1, ring->reg_idx, v_idx);
- if (q_vector->tx.ring && !q_vector->rx.ring)
- /* tx only */
- q_vector->eitr = adapter->tx_eitr_param;
- else if (q_vector->rx.ring)
- /* rx or mixed */
- q_vector->eitr = adapter->rx_eitr_param;
+ if (q_vector->tx.ring && !q_vector->rx.ring) {
+ /* tx only vector */
+ if (adapter->tx_itr_setting == 1)
+ q_vector->itr = IXGBE_10K_ITR;
+ else
+ q_vector->itr = adapter->tx_itr_setting;
+ } else {
+ /* rx or rx/tx vector */
+ if (adapter->rx_itr_setting == 1)
+ q_vector->itr = IXGBE_20K_ITR;
+ else
+ q_vector->itr = adapter->rx_itr_setting;
+ }
ixgbe_write_eitr(q_vector);
}
case ixgbe_mac_X540:
ixgbe_set_ivar(adapter, -1, 1, v_idx);
break;
-
default:
break;
}
/* set up to autoclear timer, and the vectors */
mask = IXGBE_EIMS_ENABLE_MASK;
- if (adapter->num_vfs)
- mask &= ~(IXGBE_EIMS_OTHER |
- IXGBE_EIMS_MAILBOX |
- IXGBE_EIMS_LSC);
- else
- mask &= ~(IXGBE_EIMS_OTHER | IXGBE_EIMS_LSC);
+ mask &= ~(IXGBE_EIMS_OTHER |
+ IXGBE_EIMS_MAILBOX |
+ IXGBE_EIMS_LSC);
+
IXGBE_WRITE_REG(&adapter->hw, IXGBE_EIAC, mask);
}
* 100-1249MB/s bulk (8000 ints/s)
*/
/* what was last interrupt timeslice? */
- timepassed_us = 1000000/q_vector->eitr;
+ timepassed_us = q_vector->itr >> 2;
bytes_perint = bytes / timepassed_us; /* bytes/usec */
switch (itr_setting) {
struct ixgbe_adapter *adapter = q_vector->adapter;
struct ixgbe_hw *hw = &adapter->hw;
int v_idx = q_vector->v_idx;
- u32 itr_reg = EITR_INTS_PER_SEC_TO_REG(q_vector->eitr);
+ u32 itr_reg = q_vector->itr;
switch (adapter->hw.mac.type) {
case ixgbe_mac_82598EB:
break;
case ixgbe_mac_82599EB:
case ixgbe_mac_X540:
- /*
- * 82599 and X540 can support a value of zero, so allow it for
- * max interrupt rate, but there is an errata where it can
- * not be zero with RSC
- */
- if (itr_reg == 8 &&
- !(adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED))
- itr_reg = 0;
-
/*
* set the WDIS bit to not clear the timer bits and cause an
* immediate assertion of the interrupt
static void ixgbe_set_itr(struct ixgbe_q_vector *q_vector)
{
- u32 new_itr = q_vector->eitr;
+ u32 new_itr = q_vector->itr;
u8 current_itr;
ixgbe_update_itr(q_vector, &q_vector->tx);
switch (current_itr) {
/* counts and packets in update_itr are dependent on these numbers */
case lowest_latency:
- new_itr = 100000;
+ new_itr = IXGBE_100K_ITR;
break;
case low_latency:
- new_itr = 20000; /* aka hwitr = ~200 */
+ new_itr = IXGBE_20K_ITR;
break;
case bulk_latency:
- new_itr = 8000;
+ new_itr = IXGBE_8K_ITR;
break;
default:
break;
}
- if (new_itr != q_vector->eitr) {
+ if (new_itr != q_vector->itr) {
/* do an exponential smoothing */
- new_itr = ((q_vector->eitr * 9) + new_itr)/10;
+ new_itr = (10 * new_itr * q_vector->itr) /
+ ((9 * new_itr) + q_vector->itr);
/* save the algorithm value here */
- q_vector->eitr = new_itr;
+ q_vector->itr = new_itr & IXGBE_MAX_EITR;
ixgbe_write_eitr(q_vector);
}
**/
static void ixgbe_configure_msi_and_legacy(struct ixgbe_adapter *adapter)
{
- struct ixgbe_hw *hw = &adapter->hw;
+ struct ixgbe_q_vector *q_vector = adapter->q_vector[0];
- IXGBE_WRITE_REG(hw, IXGBE_EITR(0),
- EITR_INTS_PER_SEC_TO_REG(adapter->rx_eitr_param));
+ /* rx/tx vector */
+ if (adapter->rx_itr_setting == 1)
+ q_vector->itr = IXGBE_20K_ITR;
+ else
+ q_vector->itr = adapter->rx_itr_setting;
+
+ ixgbe_write_eitr(q_vector);
ixgbe_set_ivar(adapter, 0, 0, 0);
ixgbe_set_ivar(adapter, 1, 0, 0);
if (!alloc_cpumask_var(&q_vector->affinity_mask, GFP_KERNEL))
goto err_out;
cpumask_set_cpu(v_idx, q_vector->affinity_mask);
-
- if (q_vector->tx.count && !q_vector->rx.count)
- q_vector->eitr = adapter->tx_eitr_param;
- else
- q_vector->eitr = adapter->rx_eitr_param;
-
netif_napi_add(adapter->netdev, &q_vector->napi,
ixgbe_poll, 64);
adapter->q_vector[v_idx] = q_vector;
/* enable itr by default in dynamic mode */
adapter->rx_itr_setting = 1;
- adapter->rx_eitr_param = 20000;
adapter->tx_itr_setting = 1;
- adapter->tx_eitr_param = 10000;
/* set defaults for eitr in MegaBytes */
adapter->eitr_low = 10;
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