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Message-Id: <1438818735-38115-7-git-send-email-jeffrey.t.kirsher@intel.com>
Date: Wed, 5 Aug 2015 16:52:06 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Anjali Singhai Jain <anjali.singhai@...el.com>,
netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
jogreene@...hat.com,
Catherine Sullivan <catherine.sullivan@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 06/15] i40e/i40evf: Add support for writeback on ITR feature for X722
From: Anjali Singhai Jain <anjali.singhai@...el.com>
X722 fixes an issue from X710 where TX descriptor WB would not happen if
the interrupts were disabled. In order for the write backs to happen a
bit needs to be set in the dynamic interrupt control register called
WB_ON_ITR. With this feature, the SW driver need not arm SW interrupts to
work around the issue in X710.
Signed-off-by: Anjali Singhai Jain <anjali.singhai@...el.com>
Signed-off-by: Catherine Sullivan <catherine.sullivan@...el.com>
Tested-by: Jim Young <james.m.young@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/i40e/i40e.h | 1 +
drivers/net/ethernet/intel/i40e/i40e_main.c | 2 ++
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 46 +++++++++++++++++++++------
drivers/net/ethernet/intel/i40e/i40e_txrx.h | 2 ++
drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 38 ++++++++++++++++------
drivers/net/ethernet/intel/i40evf/i40e_txrx.h | 2 ++
drivers/net/ethernet/intel/i40evf/i40evf.h | 1 +
7 files changed, 74 insertions(+), 18 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 66d0780..0f97883 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -560,6 +560,7 @@ struct i40e_q_vector {
cpumask_t affinity_mask;
struct rcu_head rcu; /* to avoid race with update stats on free */
char name[I40E_INT_NAME_STR_LEN];
+ bool arm_wb_state;
} ____cacheline_internodealigned_in_smp;
/* lan device */
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 2e84165..28f547c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -7071,6 +7071,8 @@ static int i40e_alloc_rings(struct i40e_vsi *vsi)
tx_ring->count = vsi->num_desc;
tx_ring->size = 0;
tx_ring->dcb_tc = 0;
+ if (vsi->back->flags & I40E_FLAG_WB_ON_ITR_CAPABLE)
+ tx_ring->flags = I40E_TXR_FLAGS_WB_ON_ITR;
vsi->tx_rings[i] = tx_ring;
rx_ring = &tx_ring[1];
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 330e4ef..7d0a5ea 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -853,15 +853,40 @@ static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget)
**/
static void i40e_force_wb(struct i40e_vsi *vsi, struct i40e_q_vector *q_vector)
{
- u32 val = I40E_PFINT_DYN_CTLN_INTENA_MASK |
- I40E_PFINT_DYN_CTLN_ITR_INDX_MASK | /* set noitr */
- I40E_PFINT_DYN_CTLN_SWINT_TRIG_MASK |
- I40E_PFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK;
- /* allow 00 to be written to the index */
-
- wr32(&vsi->back->hw,
- I40E_PFINT_DYN_CTLN(q_vector->v_idx + vsi->base_vector - 1),
- val);
+ u16 flags = q_vector->tx.ring[0].flags;
+
+ if (flags & I40E_TXR_FLAGS_WB_ON_ITR) {
+ u32 val;
+
+ if (q_vector->arm_wb_state)
+ return;
+
+ val = I40E_PFINT_DYN_CTLN_WB_ON_ITR_MASK;
+
+ wr32(&vsi->back->hw,
+ I40E_PFINT_DYN_CTLN(q_vector->v_idx +
+ vsi->base_vector - 1),
+ val);
+ q_vector->arm_wb_state = true;
+ } else if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) {
+ u32 val = I40E_PFINT_DYN_CTLN_INTENA_MASK |
+ I40E_PFINT_DYN_CTLN_ITR_INDX_MASK | /* set noitr */
+ I40E_PFINT_DYN_CTLN_SWINT_TRIG_MASK |
+ I40E_PFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK;
+ /* allow 00 to be written to the index */
+
+ wr32(&vsi->back->hw,
+ I40E_PFINT_DYN_CTLN(q_vector->v_idx +
+ vsi->base_vector - 1), val);
+ } else {
+ u32 val = I40E_PFINT_DYN_CTL0_INTENA_MASK |
+ I40E_PFINT_DYN_CTL0_ITR_INDX_MASK | /* set noitr */
+ I40E_PFINT_DYN_CTL0_SWINT_TRIG_MASK |
+ I40E_PFINT_DYN_CTL0_SW_ITR_INDX_ENA_MASK;
+ /* allow 00 to be written to the index */
+
+ wr32(&vsi->back->hw, I40E_PFINT_DYN_CTL0, val);
+ }
}
/**
@@ -1918,6 +1943,9 @@ int i40e_napi_poll(struct napi_struct *napi, int budget)
return budget;
}
+ if (vsi->back->flags & I40E_TXR_FLAGS_WB_ON_ITR)
+ q_vector->arm_wb_state = false;
+
/* Work is done so exit the polling mode and re-enable the interrupt */
napi_complete(napi);
if (vsi->back->flags & I40E_FLAG_MSIX_ENABLED) {
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index 8b618d0..0e40994 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
@@ -265,6 +265,8 @@ struct i40e_ring {
bool ring_active; /* is ring online or not */
bool arm_wb; /* do something to arm write back */
+ u16 flags;
+#define I40E_TXR_FLAGS_WB_ON_ITR BIT(0)
/* stats structs */
struct i40e_queue_stats stats;
struct u64_stats_sync syncp;
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
index 60f88e4..6dbcbca 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -366,15 +366,32 @@ static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget)
**/
static void i40e_force_wb(struct i40e_vsi *vsi, struct i40e_q_vector *q_vector)
{
- u32 val = I40E_VFINT_DYN_CTLN_INTENA_MASK |
- I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK | /* set noitr */
- I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
- I40E_VFINT_DYN_CTLN_SW_ITR_INDX_ENA_MASK;
- /* allow 00 to be written to the index */
-
- wr32(&vsi->back->hw,
- I40E_VFINT_DYN_CTLN1(q_vector->v_idx + vsi->base_vector - 1),
- val);
+ u16 flags = q_vector->tx.ring[0].flags;
+
+ if (flags & I40E_TXR_FLAGS_WB_ON_ITR) {
+ u32 val;
+
+ if (q_vector->arm_wb_state)
+ return;
+
+ val = I40E_VFINT_DYN_CTLN1_WB_ON_ITR_MASK;
+
+ wr32(&vsi->back->hw,
+ I40E_VFINT_DYN_CTLN1(q_vector->v_idx +
+ vsi->base_vector - 1),
+ val);
+ q_vector->arm_wb_state = true;
+ } else {
+ u32 val = I40E_VFINT_DYN_CTLN1_INTENA_MASK |
+ I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK | /* set noitr */
+ I40E_VFINT_DYN_CTLN1_SWINT_TRIG_MASK |
+ I40E_VFINT_DYN_CTLN1_SW_ITR_INDX_ENA_MASK;
+ /* allow 00 to be written to the index */
+
+ wr32(&vsi->back->hw,
+ I40E_VFINT_DYN_CTLN1(q_vector->v_idx +
+ vsi->base_vector - 1), val);
+ }
}
/**
@@ -1372,6 +1389,9 @@ int i40evf_napi_poll(struct napi_struct *napi, int budget)
return budget;
}
+ if (vsi->back->flags & I40E_TXR_FLAGS_WB_ON_ITR)
+ q_vector->arm_wb_state = false;
+
/* Work is done so exit the polling mode and re-enable the interrupt */
napi_complete(napi);
i40e_update_enable_itr(vsi, q_vector);
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
index b2f9b82..17bb59d 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
@@ -262,6 +262,8 @@ struct i40e_ring {
bool ring_active; /* is ring online or not */
bool arm_wb; /* do something to arm write back */
+ u16 flags;
+#define I40E_TXR_FLAGS_WB_ON_ITR BIT(0)
/* stats structs */
struct i40e_queue_stats stats;
struct u64_stats_sync syncp;
diff --git a/drivers/net/ethernet/intel/i40evf/i40evf.h b/drivers/net/ethernet/intel/i40evf/i40evf.h
index fa421d6..3817cbb 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf.h
+++ b/drivers/net/ethernet/intel/i40evf/i40evf.h
@@ -117,6 +117,7 @@ struct i40e_q_vector {
u8 num_ringpairs; /* total number of ring pairs in vector */
int v_idx; /* vector index in list */
char name[IFNAMSIZ + 9];
+ bool arm_wb_state;
cpumask_var_t affinity_mask;
};
--
2.4.3
--
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