net/i40e: enable multi-queue Rx interrupt for VF

Current implementation is that only one Rx queue can support interrupt,
because all queues are mapped in the same vector id in
vfio_enable_msix(). So VF can not support multi-queue Rx interrupt in
the interrupt mode.

In this patch, if the packet I/O interrupt on datapath is enabled
(rte_intr_dp_is_en(intr_handle) is true), we map different interrupt
vectors to each queue and send this map to PF. After PF sets the map to
the register, all Rx queue interrupts will be received.

In addition, vector id should less than the maximum vector value. When
queue number is more than vector value, we set up a loop of interrupt
vectors map.

Signed-off-by: Lunyuan Cui <lunyuanx.cui@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 43f7ab5..bec9933 100644 (file)
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -651,12 +651,13 @@ i40evf_config_irq_map(struct rte_eth_dev *dev)
        struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
        struct vf_cmd_info args;
        uint8_t cmd_buffer[sizeof(struct virtchnl_irq_map_info) + \
-               sizeof(struct virtchnl_vector_map)];
+               sizeof(struct virtchnl_vector_map) * dev->data->nb_rx_queues];
        struct virtchnl_irq_map_info *map_info;
        struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
        struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
        uint32_t vector_id;
        int i, err;
+       uint16_t nb_msix;
 
        if (dev->data->dev_conf.intr_conf.rxq != 0 &&
            rte_intr_allow_others(intr_handle))
@@ -664,19 +665,25 @@ i40evf_config_irq_map(struct rte_eth_dev *dev)
        else
                vector_id = I40E_MISC_VEC_ID;
 
+       nb_msix = RTE_MIN(vf->vf_res->max_vectors,
+                       intr_handle->nb_efd);
+
        map_info = (struct virtchnl_irq_map_info *)cmd_buffer;
-       map_info->num_vectors = 1;
-       map_info->vecmap[0].rxitr_idx = I40E_ITR_INDEX_DEFAULT;
-       map_info->vecmap[0].vsi_id = vf->vsi_res->vsi_id;
-       /* Alway use default dynamic MSIX interrupt */
-       map_info->vecmap[0].vector_id = vector_id;
-       /* Don't map any tx queue */
-       map_info->vecmap[0].txq_map = 0;
-       map_info->vecmap[0].rxq_map = 0;
+       map_info->num_vectors = dev->data->nb_rx_queues;
        for (i = 0; i < dev->data->nb_rx_queues; i++) {
-               map_info->vecmap[0].rxq_map |= 1 << i;
+               map_info->vecmap[i].rxitr_idx = I40E_ITR_INDEX_DEFAULT;
+               map_info->vecmap[i].vsi_id = vf->vsi_res->vsi_id;
+               /* Always use default dynamic MSIX interrupt */
+               map_info->vecmap[i].vector_id = vector_id;
+               /* Don't map any tx queue */
+               map_info->vecmap[i].txq_map = 0;
+               map_info->vecmap[i].rxq_map = 1 << i;
                if (rte_intr_dp_is_en(intr_handle))
                        intr_handle->intr_vec[i] = vector_id;
+               if (vector_id > I40E_MISC_VEC_ID)
+                       vector_id++;
+               if (vector_id > nb_msix)
+                       vector_id = I40E_RX_VEC_START;
        }
 
        args.ops = VIRTCHNL_OP_CONFIG_IRQ_MAP;