[dpdk-dev] [PATCH 2/2] i40e: add required steps in TX queue enable, disable
Helin Zhang
helin.zhang at intel.com
Wed Jul 2 05:10:25 CEST 2014
Hardware specification changed recently which requires to set
or clear TX queue disable flags before actually enabling or
disabling a specific TX queue. 'QTX_HEAD' register needs to
be cleared before setting the QENA_REQ flag.
Signed-off-by: Helin Zhang <helin.zhang at intel.com>
Acked-by: Jijiang Liu <jijiang.liu at intel.com>
Acked-by: Jing Chen <jing.d.chen at intel.com>
---
lib/librte_pmd_i40e/i40e_ethdev.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/lib/librte_pmd_i40e/i40e_ethdev.c b/lib/librte_pmd_i40e/i40e_ethdev.c
index 6624586..9ed31b5 100644
--- a/lib/librte_pmd_i40e/i40e_ethdev.c
+++ b/lib/librte_pmd_i40e/i40e_ethdev.c
@@ -85,6 +85,8 @@
#define I40E_QUEUE_ITR_INTERVAL_DEFAULT 32 /* 32 us */
#define I40E_QUEUE_ITR_INTERVAL_MAX 8160 /* 8160 us */
+#define I40E_PRE_TX_Q_CFG_WAIT_US 10 /* 10 us */
+
#define I40E_RSS_OFFLOAD_ALL ( \
ETH_RSS_NONF_IPV4_UDP | \
ETH_RSS_NONF_IPV4_TCP | \
@@ -2780,6 +2782,13 @@ i40e_switch_tx_queue(struct i40e_hw *hw, uint16_t q_idx, bool on)
uint32_t reg;
uint16_t j;
+ /**
+ * Set or clear TX Queue Disable flags,
+ * which is required by hardware.
+ */
+ i40e_pre_tx_queue_cfg(hw, q_idx, on);
+ rte_delay_us(I40E_PRE_TX_Q_CFG_WAIT_US);
+
/* Wait until the request is finished */
for (j = 0; j < I40E_CHK_Q_ENA_COUNT; j++) {
rte_delay_us(I40E_CHK_Q_ENA_INTERVAL_US);
@@ -2793,6 +2802,8 @@ i40e_switch_tx_queue(struct i40e_hw *hw, uint16_t q_idx, bool on)
if (on) {
if (reg & I40E_QTX_ENA_QENA_STAT_MASK)
return I40E_SUCCESS; /* already on, skip next steps */
+
+ I40E_WRITE_REG(hw, I40E_QTX_HEAD(q_idx), 0);
reg |= I40E_QTX_ENA_QENA_REQ_MASK;
} else {
if (!(reg & I40E_QTX_ENA_QENA_STAT_MASK))
@@ -2821,8 +2832,10 @@ i40e_switch_tx_queue(struct i40e_hw *hw, uint16_t q_idx, bool on)
(on ? "enable" : "disable"), q_idx);
return I40E_ERR_TIMEOUT;
}
+
return I40E_SUCCESS;
}
+
/* Swith on or off the tx queues */
static int
i40e_vsi_switch_tx_queues(struct i40e_vsi *vsi, bool on)
--
1.8.1.4
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