Feature Add: Rx/Tx flow control support for the i40e
All the Rx/Tx LFC enable/disable operation is done by the F/W,
so PMD driver need to use the Set PHY Config AD command to trigger the PHY
to do the auto-negotiation, after the Tx/Rx pause ability is negotiated,
the F/W will help us to set the related LFC enable/disable registers.
PMD driver also need to configure the related registers to control
how often to send the pause frame and what the value in the pause frame.
Signed-off-by: Zhe Tao <zhe.tao at intel.com>
---
PATCH V1: add the LFC support for i40e
PATCH v2: move the LFC parameters init to the i40e_pf_parameter_init
PATCH v3: update the release note
doc/guides/rel_notes/release_2_2.rst | 4 +
drivers/net/i40e/i40e_ethdev.c | 170 ++++++++++++++++++++++++++++++++++-
drivers/net/i40e/i40e_ethdev.h | 12 +++
3 files changed, 183 insertions(+), 3 deletions(-)
diff --git a/doc/guides/rel_notes/release_2_2.rst
b/doc/guides/rel_notes/release_2_2.rst
index bc9b00f..3475aa7 100644
--- a/doc/guides/rel_notes/release_2_2.rst
+++ b/doc/guides/rel_notes/release_2_2.rst
@@ -39,6 +39,10 @@ Drivers
Fixed i40e issue that occurred when a DPDK application didn't initialize
ports if memory wasn't available on socket 0.
+* **i40e: Add the support for link flow control.**
+
+ Add the support for link flow control on FVL.
+
* **vhost: Fixed Qemu shutdown.**
Fixed issue with libvirt ``virsh destroy`` not killing the VM.
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 2dd9fdc..e68e0b7 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -81,6 +81,27 @@
#define I40E_PRE_TX_Q_CFG_WAIT_US 10 /* 10 us */
+/* Flow control default timer */
+#define I40E_DEFAULT_PAUSE_TIME 0xFFFFU
+
+/* Flow control default high water */
+#define I40E_DEFAULT_HIGH_WATER (0x1C40/1024)
+
+/* Flow control default low water */
+#define I40E_DEFAULT_LOW_WATER (0x1A40/1024)
+
+/* Flow control enable fwd bit */
+#define I40E_PRTMAC_FWD_CTRL 0x00000001
+
+/* Receive Packet Buffer size */
+#define I40E_RXPBSIZE (968 * 1024)
+
+/* Kilobytes shift */
+#define I40E_KILOSHIFT 10
+
+/* Receive Average Packet Size in Byte*/
+#define I40E_PACKET_AVERAGE_SIZE 128
+
/* Mask of PF interrupt causes */
#define I40E_PFINT_ICR0_ENA_MASK ( \
I40E_PFINT_ICR0_ENA_ECC_ERR_MASK | \
@@ -145,6 +166,8 @@ static void i40e_vlan_strip_queue_set(struct rte_eth_dev
*dev,
static int i40e_vlan_pvid_set(struct rte_eth_dev *dev, uint16_t pvid, int on);
static int i40e_dev_led_on(struct rte_eth_dev *dev);
static int i40e_dev_led_off(struct rte_eth_dev *dev);
+static int i40e_flow_ctrl_get(struct rte_eth_dev *dev,
+ struct rte_eth_fc_conf *fc_conf);
static int i40e_flow_ctrl_set(struct rte_eth_dev *dev,
struct rte_eth_fc_conf *fc_conf);
static int i40e_priority_flow_ctrl_set(struct rte_eth_dev *dev,
@@ -272,6 +295,7 @@ static const struct eth_dev_ops i40e_eth_dev_ops = {
.tx_queue_release = i40e_dev_tx_queue_release,
.dev_led_on = i40e_dev_led_on,
.dev_led_off = i40e_dev_led_off,
+ .flow_ctrl_get = i40e_flow_ctrl_get,
.flow_ctrl_set = i40e_flow_ctrl_set,
.priority_flow_ctrl_set = i40e_priority_flow_ctrl_set,
.mac_addr_add = i40e_macaddr_add,
@@ -1782,12 +1806,148 @@ i40e_dev_led_off(struct rte_eth_dev *dev)
}
static int
-i40e_flow_ctrl_set(__rte_unused struct rte_eth_dev *dev,
- __rte_unused struct rte_eth_fc_conf *fc_conf)
+i40e_flow_ctrl_get(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
{
+ struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
+
+ fc_conf->pause_time = pf->fc_conf.pause_time;
+ fc_conf->high_water = pf->fc_conf.high_water[I40E_MAX_TRAFFIC_CLASS];
+ fc_conf->low_water = pf->fc_conf.low_water[I40E_MAX_TRAFFIC_CLASS];
+
+ /* Return current mode according to actual setting*/
+ switch (hw->fc.current_mode) {
+ case I40E_FC_FULL:
+ fc_conf->mode = RTE_FC_FULL;
+ break;
+ case I40E_FC_TX_PAUSE:
+ fc_conf->mode = RTE_FC_TX_PAUSE;
+ break;
+ case I40E_FC_RX_PAUSE:
+ fc_conf->mode = RTE_FC_RX_PAUSE;
+ break;
+ case I40E_FC_NONE:
+ default:
+ fc_conf->mode = RTE_FC_NONE;
+ };
+
+ return 0;
+}
+
+static int
+i40e_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
+{
+ uint32_t mflcn_reg, fctrl_reg, reg;
+ uint32_t max_high_water;
+ uint8_t i, aq_failure;
+ int err;
+ struct i40e_hw *hw;
+ struct i40e_pf *pf;
+ enum i40e_fc_mode rte_fcmode_2_i40e_fcmode[] = {
+ [RTE_FC_NONE] = I40E_FC_NONE,
+ [RTE_FC_RX_PAUSE] = I40E_FC_RX_PAUSE,
+ [RTE_FC_TX_PAUSE] = I40E_FC_TX_PAUSE,
+ [RTE_FC_FULL] = I40E_FC_FULL
+ };
+
+ /* high_water field in the rte_eth_fc_conf using the kilobytes unit */
+
+ max_high_water = I40E_RXPBSIZE >> I40E_KILOSHIFT;
+ if ((fc_conf->high_water > max_high_water) ||
+ (fc_conf->high_water < fc_conf->low_water)) {
+ PMD_INIT_LOG(ERR, "Invalid high/low water setup value in KB, "
+ "High_water must <= %d.", max_high_water);
+ return -EINVAL;
+ }
+
+ hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
+ hw->fc.requested_mode = rte_fcmode_2_i40e_fcmode[fc_conf->mode];
+
+ pf->fc_conf.pause_time = fc_conf->pause_time;
+ pf->fc_conf.high_water[I40E_MAX_TRAFFIC_CLASS] = fc_conf->high_water;
+ pf->fc_conf.low_water[I40E_MAX_TRAFFIC_CLASS] = fc_conf->low_water;
+
PMD_INIT_FUNC_TRACE();
- return -ENOSYS;
+ /* All the link flow control related enable/disable register
+ * configuration is handle by the F/W
+ */
+ err = i40e_set_fc(hw, &aq_failure, true);
+ if (err < 0)
+ return -ENOSYS;
+
+ if (i40e_is_40G_device(hw->device_id)) {
+ /* Configure flow control refresh threshold,
+ * the value for stat_tx_pause_refresh_timer[8]
+ * is used for global pause operation.
+ */
+
+ I40E_WRITE_REG(hw,
+ I40E_PRTMAC_HSEC_CTL_TX_PAUSE_REFRESH_TIMER(8),
+ pf->fc_conf.pause_time);
+
+ /* configure the timer value included in transmitted pause
+ * frame,
+ * the value for stat_tx_pause_quanta[8] is used for global
+ * pause operation
+ */
+ I40E_WRITE_REG(hw, I40E_PRTMAC_HSEC_CTL_TX_PAUSE_QUANTA(8),
+ pf->fc_conf.pause_time);
+
+ fctrl_reg = I40E_READ_REG(hw,
+
I40E_PRTMAC_HSEC_CTL_RX_FORWARD_CONTROL);
+
+ if (fc_conf->mac_ctrl_frame_fwd != 0)
+ fctrl_reg |= I40E_PRTMAC_FWD_CTRL;
+ else
+ fctrl_reg &= ~I40E_PRTMAC_FWD_CTRL;
+
+ I40E_WRITE_REG(hw, I40E_PRTMAC_HSEC_CTL_RX_FORWARD_CONTROL,
+ fctrl_reg);
+ } else {
+ /* Configure pause time (2 TCs per register) */
+ reg = (uint32_t)pf->fc_conf.pause_time * (uint32_t)0x00010001;
+ for (i = 0; i < I40E_MAX_TRAFFIC_CLASS / 2; i++)
+ I40E_WRITE_REG(hw, I40E_PRTDCB_FCTTVN(i), reg);
+
+ /* Configure flow control refresh threshold value */
+ I40E_WRITE_REG(hw, I40E_PRTDCB_FCRTV,
+ pf->fc_conf.pause_time / 2);
+
+ mflcn_reg = I40E_READ_REG(hw, I40E_PRTDCB_MFLCN);
+
+ /* set or clear MFLCN.PMCF & MFLCN.DPF bits
+ *depending on configuration
+ */
+ if (fc_conf->mac_ctrl_frame_fwd != 0) {
+ mflcn_reg |= I40E_PRTDCB_MFLCN_PMCF_MASK;
+ mflcn_reg &= ~I40E_PRTDCB_MFLCN_DPF_MASK;
+ } else {
+ mflcn_reg &= ~I40E_PRTDCB_MFLCN_PMCF_MASK;
+ mflcn_reg |= I40E_PRTDCB_MFLCN_DPF_MASK;
+ }
+
+ I40E_WRITE_REG(hw, I40E_PRTDCB_MFLCN, mflcn_reg);
+ }
+
+ /* config the water marker both based on the packets and bytes */
+ I40E_WRITE_REG(hw, I40E_GLRPB_PHW,
+ (pf->fc_conf.high_water[I40E_MAX_TRAFFIC_CLASS]
+ << I40E_KILOSHIFT) / I40E_PACKET_AVERAGE_SIZE);
+ I40E_WRITE_REG(hw, I40E_GLRPB_PLW,
+ (pf->fc_conf.low_water[I40E_MAX_TRAFFIC_CLASS]
+ << I40E_KILOSHIFT) / I40E_PACKET_AVERAGE_SIZE);
+ I40E_WRITE_REG(hw, I40E_GLRPB_GHW,
+ pf->fc_conf.high_water[I40E_MAX_TRAFFIC_CLASS]
+ << I40E_KILOSHIFT);
+ I40E_WRITE_REG(hw, I40E_GLRPB_GLW,
+ pf->fc_conf.low_water[I40E_MAX_TRAFFIC_CLASS]
+ << I40E_KILOSHIFT);
+
+ I40E_WRITE_FLUSH(hw);
+
+ return 0;
}
static int
@@ -2247,6 +2407,10 @@ i40e_pf_parameter_init(struct rte_eth_dev *dev)
PMD_INIT_LOG(ERR, "HW configuration doesn't support SRIOV");
return -EINVAL;
}
+ /* Add the parameter init for LFC */
+ pf->fc_conf.pause_time = I40E_DEFAULT_PAUSE_TIME;
+ pf->fc_conf.high_water[I40E_MAX_TRAFFIC_CLASS] =
I40E_DEFAULT_HIGH_WATER;
+ pf->fc_conf.low_water[I40E_MAX_TRAFFIC_CLASS] = I40E_DEFAULT_LOW_WATER;
pf->flags = I40E_FLAG_HEADER_SPLIT_DISABLED;
pf->max_num_vsi = RTE_MIN(hw->func_caps.num_vsis, I40E_MAX_NUM_VSIS);
diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index 6185657..8707a98 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -282,6 +282,17 @@ struct i40e_pf_vf {
};
/*
+ * Structure to store private data for flow control.
+ */
+struct i40e_fc_conf {
+ uint16_t pause_time; /* Flow control pause timer */
+ /* FC high water 0-7 for pfc and 8 for lfc unit:kilobytes */
+ uint32_t high_water[I40E_MAX_TRAFFIC_CLASS + 1];
+ /* FC low water 0-7 for pfc and 8 for lfc unit:kilobytes */
+ uint32_t low_water[I40E_MAX_TRAFFIC_CLASS + 1];
+};
+
+/*
* Structure to store private data for VMDQ instance
*/
struct i40e_vmdq_info {
@@ -385,6 +396,7 @@ struct i40e_pf {
struct i40e_vmdq_info *vmdq;
struct i40e_fdir_info fdir; /* flow director info */
+ struct i40e_fc_conf fc_conf; /* Flow control conf */
struct i40e_mirror_rule_list mirror_list;
uint16_t nb_mirror_rule; /* The number of mirror rules */
};
--
1.9.3
