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Date: Wed, 19 Apr 2017 18:57:44 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 08/14] i40e: factor out queue control from i40e_vsi_control_(tx|rx)
From: Jacob Keller <jacob.e.keller@...el.com>
A future patch will need to be able to handle controlling queues without
waiting until all VSIs are handled. Factor out the direct queue
modification so that we can easily re-use this code. The result is also
a bit easier to read since we don't embed multiple single-letter loop
counters.
Change-ID: Id923cbfa43127b1c24d8ed4f809b1012c736d9ac
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/i40e/i40e_main.c | 139 ++++++++++++++++++----------
1 file changed, 89 insertions(+), 50 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 5c2ceb247959..2bf5bb1b4627 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -3919,6 +3919,8 @@ static void i40e_netpoll(struct net_device *netdev)
}
#endif
+#define I40E_QTX_ENA_WAIT_COUNT 50
+
/**
* i40e_pf_txq_wait - Wait for a PF's Tx queue to be enabled or disabled
* @pf: the PF being configured
@@ -3949,6 +3951,50 @@ static int i40e_pf_txq_wait(struct i40e_pf *pf, int pf_q, bool enable)
}
/**
+ * i40e_control_tx_q - Start or stop a particular Tx queue
+ * @pf: the PF structure
+ * @pf_q: the PF queue to configure
+ * @enable: start or stop the queue
+ *
+ * This function enables or disables a single queue. Note that any delay
+ * required after the operation is expected to be handled by the caller of
+ * this function.
+ **/
+static void i40e_control_tx_q(struct i40e_pf *pf, int pf_q, bool enable)
+{
+ struct i40e_hw *hw = &pf->hw;
+ u32 tx_reg;
+ int i;
+
+ /* warn the TX unit of coming changes */
+ i40e_pre_tx_queue_cfg(&pf->hw, pf_q, enable);
+ if (!enable)
+ usleep_range(10, 20);
+
+ for (i = 0; i < I40E_QTX_ENA_WAIT_COUNT; i++) {
+ tx_reg = rd32(hw, I40E_QTX_ENA(pf_q));
+ if (((tx_reg >> I40E_QTX_ENA_QENA_REQ_SHIFT) & 1) ==
+ ((tx_reg >> I40E_QTX_ENA_QENA_STAT_SHIFT) & 1))
+ break;
+ usleep_range(1000, 2000);
+ }
+
+ /* Skip if the queue is already in the requested state */
+ if (enable == !!(tx_reg & I40E_QTX_ENA_QENA_STAT_MASK))
+ return;
+
+ /* turn on/off the queue */
+ if (enable) {
+ wr32(hw, I40E_QTX_HEAD(pf_q), 0);
+ tx_reg |= I40E_QTX_ENA_QENA_REQ_MASK;
+ } else {
+ tx_reg &= ~I40E_QTX_ENA_QENA_REQ_MASK;
+ }
+
+ wr32(hw, I40E_QTX_ENA(pf_q), tx_reg);
+}
+
+/**
* i40e_vsi_control_tx - Start or stop a VSI's rings
* @vsi: the VSI being configured
* @enable: start or stop the rings
@@ -3956,39 +4002,13 @@ static int i40e_pf_txq_wait(struct i40e_pf *pf, int pf_q, bool enable)
static int i40e_vsi_control_tx(struct i40e_vsi *vsi, bool enable)
{
struct i40e_pf *pf = vsi->back;
- struct i40e_hw *hw = &pf->hw;
- int i, j, pf_q, ret = 0;
- u32 tx_reg;
+ int i, pf_q, ret = 0;
pf_q = vsi->base_queue;
for (i = 0; i < vsi->num_queue_pairs; i++, pf_q++) {
+ i40e_control_tx_q(pf, pf_q, enable);
- /* warn the TX unit of coming changes */
- i40e_pre_tx_queue_cfg(&pf->hw, pf_q, enable);
- if (!enable)
- usleep_range(10, 20);
-
- for (j = 0; j < 50; j++) {
- tx_reg = rd32(hw, I40E_QTX_ENA(pf_q));
- if (((tx_reg >> I40E_QTX_ENA_QENA_REQ_SHIFT) & 1) ==
- ((tx_reg >> I40E_QTX_ENA_QENA_STAT_SHIFT) & 1))
- break;
- usleep_range(1000, 2000);
- }
- /* Skip if the queue is already in the requested state */
- if (enable == !!(tx_reg & I40E_QTX_ENA_QENA_STAT_MASK))
- continue;
-
- /* turn on/off the queue */
- if (enable) {
- wr32(hw, I40E_QTX_HEAD(pf_q), 0);
- tx_reg |= I40E_QTX_ENA_QENA_REQ_MASK;
- } else {
- tx_reg &= ~I40E_QTX_ENA_QENA_REQ_MASK;
- }
-
- wr32(hw, I40E_QTX_ENA(pf_q), tx_reg);
- /* No waiting for the Tx queue to disable */
+ /* Don't wait to disable when port Tx is suspended */
if (!enable && test_bit(__I40E_PORT_TX_SUSPENDED, &pf->state))
continue;
@@ -4035,6 +4055,43 @@ static int i40e_pf_rxq_wait(struct i40e_pf *pf, int pf_q, bool enable)
}
/**
+ * i40e_control_rx_q - Start or stop a particular Rx queue
+ * @pf: the PF structure
+ * @pf_q: the PF queue to configure
+ * @enable: start or stop the queue
+ *
+ * This function enables or disables a single queue. Note that any delay
+ * required after the operation is expected to be handled by the caller of
+ * this function.
+ **/
+static void i40e_control_rx_q(struct i40e_pf *pf, int pf_q, bool enable)
+{
+ struct i40e_hw *hw = &pf->hw;
+ u32 rx_reg;
+ int i;
+
+ for (i = 0; i < I40E_QTX_ENA_WAIT_COUNT; i++) {
+ rx_reg = rd32(hw, I40E_QRX_ENA(pf_q));
+ if (((rx_reg >> I40E_QRX_ENA_QENA_REQ_SHIFT) & 1) ==
+ ((rx_reg >> I40E_QRX_ENA_QENA_STAT_SHIFT) & 1))
+ break;
+ usleep_range(1000, 2000);
+ }
+
+ /* Skip if the queue is already in the requested state */
+ if (enable == !!(rx_reg & I40E_QRX_ENA_QENA_STAT_MASK))
+ return;
+
+ /* turn on/off the queue */
+ if (enable)
+ rx_reg |= I40E_QRX_ENA_QENA_REQ_MASK;
+ else
+ rx_reg &= ~I40E_QRX_ENA_QENA_REQ_MASK;
+
+ wr32(hw, I40E_QRX_ENA(pf_q), rx_reg);
+}
+
+/**
* i40e_vsi_control_rx - Start or stop a VSI's rings
* @vsi: the VSI being configured
* @enable: start or stop the rings
@@ -4042,31 +4099,13 @@ static int i40e_pf_rxq_wait(struct i40e_pf *pf, int pf_q, bool enable)
static int i40e_vsi_control_rx(struct i40e_vsi *vsi, bool enable)
{
struct i40e_pf *pf = vsi->back;
- struct i40e_hw *hw = &pf->hw;
- int i, j, pf_q, ret = 0;
- u32 rx_reg;
+ int i, pf_q, ret = 0;
pf_q = vsi->base_queue;
for (i = 0; i < vsi->num_queue_pairs; i++, pf_q++) {
- for (j = 0; j < 50; j++) {
- rx_reg = rd32(hw, I40E_QRX_ENA(pf_q));
- if (((rx_reg >> I40E_QRX_ENA_QENA_REQ_SHIFT) & 1) ==
- ((rx_reg >> I40E_QRX_ENA_QENA_STAT_SHIFT) & 1))
- break;
- usleep_range(1000, 2000);
- }
+ i40e_control_rx_q(pf, pf_q, enable);
- /* Skip if the queue is already in the requested state */
- if (enable == !!(rx_reg & I40E_QRX_ENA_QENA_STAT_MASK))
- continue;
-
- /* turn on/off the queue */
- if (enable)
- rx_reg |= I40E_QRX_ENA_QENA_REQ_MASK;
- else
- rx_reg &= ~I40E_QRX_ENA_QENA_REQ_MASK;
- wr32(hw, I40E_QRX_ENA(pf_q), rx_reg);
- /* No waiting for the Tx queue to disable */
+ /* Don't wait to disable when port Tx is suspended */
if (!enable && test_bit(__I40E_PORT_TX_SUSPENDED, &pf->state))
continue;
--
2.12.2
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