[PATCH v8 11/21] net/cpfl: support write back based on ITR expire

[Mingxia Liu]

ITR is the interval between two interrupts, it can be understood
as a timer here. WB_ON_ITR(write back on ITR expire) is used for
receiving packets without interrupts or full cache line, then
packets can be received one by one.

To enable WB_ON_ITR, need to enable some interrupt with
'idpf_vport_irq_map_config()' first.

Signed-off-by: Mingxia Liu <mingxia....@intel.com>
---
 drivers/net/cpfl/cpfl_ethdev.c | 45 +++++++++++++++++++++++++++++++++-
 drivers/net/cpfl/cpfl_ethdev.h |  2 ++
 2 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/drivers/net/cpfl/cpfl_ethdev.c b/drivers/net/cpfl/cpfl_ethdev.c
index 37e0270dd7..b09c7d4996 100644
--- a/drivers/net/cpfl/cpfl_ethdev.c
+++ b/drivers/net/cpfl/cpfl_ethdev.c
@@ -209,6 +209,15 @@ cpfl_dev_configure(struct rte_eth_dev *dev)
        return 0;
 }
 
+static int
+cpfl_config_rx_queues_irqs(struct rte_eth_dev *dev)
+{
+       struct idpf_vport *vport = dev->data->dev_private;
+       uint16_t nb_rx_queues = dev->data->nb_rx_queues;
+
+       return idpf_vport_irq_map_config(vport, nb_rx_queues);
+}
+
 static int
 cpfl_start_queues(struct rte_eth_dev *dev)
 {
@@ -246,12 +255,37 @@ static int
 cpfl_dev_start(struct rte_eth_dev *dev)
 {
        struct idpf_vport *vport = dev->data->dev_private;
+       struct idpf_adapter *base = vport->adapter;
+       struct cpfl_adapter_ext *adapter = CPFL_ADAPTER_TO_EXT(base);
+       uint16_t num_allocated_vectors = base->caps.num_allocated_vectors;
+       uint16_t req_vecs_num;
        int ret;
 
+       req_vecs_num = CPFL_DFLT_Q_VEC_NUM;
+       if (req_vecs_num + adapter->used_vecs_num > num_allocated_vectors) {
+               PMD_DRV_LOG(ERR, "The accumulated request vectors' number 
should be less than %d",
+                           num_allocated_vectors);
+               ret = -EINVAL;
+               goto err_vec;
+       }
+
+       ret = idpf_vc_vectors_alloc(vport, req_vecs_num);
+       if (ret != 0) {
+               PMD_DRV_LOG(ERR, "Failed to allocate interrupt vectors");
+               goto err_vec;
+       }
+       adapter->used_vecs_num += req_vecs_num;
+
+       ret = cpfl_config_rx_queues_irqs(dev);
+       if (ret != 0) {
+               PMD_DRV_LOG(ERR, "Failed to configure irqs");
+               goto err_irq;
+       }
+
        ret = cpfl_start_queues(dev);
        if (ret != 0) {
                PMD_DRV_LOG(ERR, "Failed to start queues");
-               return ret;
+               goto err_startq;
        }
 
        cpfl_set_rx_function(dev);
@@ -269,6 +303,11 @@ cpfl_dev_start(struct rte_eth_dev *dev)
 
 err_vport:
        cpfl_stop_queues(dev);
+err_startq:
+       idpf_vport_irq_unmap_config(vport, dev->data->nb_rx_queues);
+err_irq:
+       idpf_vc_vectors_dealloc(vport);
+err_vec:
        return ret;
 }
 
@@ -284,6 +323,10 @@ cpfl_dev_stop(struct rte_eth_dev *dev)
 
        cpfl_stop_queues(dev);
 
+       idpf_vport_irq_unmap_config(vport, dev->data->nb_rx_queues);
+
+       idpf_vc_vectors_dealloc(vport);
+
        vport->stopped = 1;
 
        return 0;
diff --git a/drivers/net/cpfl/cpfl_ethdev.h b/drivers/net/cpfl/cpfl_ethdev.h
index 9738e89ca8..4d1441ae64 100644
--- a/drivers/net/cpfl/cpfl_ethdev.h
+++ b/drivers/net/cpfl/cpfl_ethdev.h
@@ -25,6 +25,8 @@
 
 #define CPFL_INVALID_VPORT_IDX 0xffff
 
+#define CPFL_DFLT_Q_VEC_NUM    1
+
 #define CPFL_MIN_BUF_SIZE      1024
 #define CPFL_MAX_FRAME_SIZE    9728
 #define CPFL_DEFAULT_MTU       RTE_ETHER_MTU
-- 
2.34.1