[dpdk-dev] [PATCH] net/i40e: fix modifying the number of queues
Jeff Guo
jia.guo at intel.com
Sun Jun 21 15:36:11 CEST 2020
hi, alvin
On 6/10/2020 8:07 PM, alvinx.zhang at intel.com wrote:
> From: Alvin Zhang <alvinx.zhang at intel.com>
>
> For the newly created VF, if the number of qps is greater than 4
> at startup, it may fail to start. This patch updates the API
> `i40evf_dev_configure`.
Could you explicit explain why it limit to 4 qps, and more detail about
below code change with the purpose of the patch.
> Fixes: c48eb308ed13 ("net/i40e: support VF request more queues")
> Cc: stable at dpdk.org
>
> Signed-off-by: Alvin Zhang <alvinx.zhang at intel.com>
> ---
> drivers/net/i40e/i40e_ethdev_vf.c | 32 ++++++++++++++++++++++++--------
> 1 file changed, 24 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
> index bb5d28a..7500e0a 100644
> --- a/drivers/net/i40e/i40e_ethdev_vf.c
> +++ b/drivers/net/i40e/i40e_ethdev_vf.c
> @@ -1082,13 +1082,10 @@ static int i40evf_dev_xstats_get(struct rte_eth_dev *dev,
> args.out_buffer = vf->aq_resp;
> args.out_size = I40E_AQ_BUF_SZ;
>
> - rte_eal_alarm_cancel(i40evf_dev_alarm_handler, dev);
Why interrupt handler is no need to cancel here and more why this change
is related with this patch according with the commit log?
> err = i40evf_execute_vf_cmd(dev, &args);
> if (err)
> PMD_DRV_LOG(ERR, "fail to execute command OP_REQUEST_QUEUES");
>
> - rte_eal_alarm_set(I40EVF_ALARM_INTERVAL,
> - i40evf_dev_alarm_handler, dev);
> return err;
> }
>
> @@ -1516,7 +1513,7 @@ static int i40evf_dev_xstats_get(struct rte_eth_dev *dev,
> hw->bus.device = pci_dev->addr.devid;
> hw->bus.func = pci_dev->addr.function;
> hw->hw_addr = (void *)pci_dev->mem_resource[0].addr;
> - hw->adapter_stopped = 0;
> + hw->adapter_stopped = 1;
Why it should be set stopped when init dev?
> hw->adapter_closed = 0;
>
> /* Pass the information to the rte_eth_dev_close() that it should also
> @@ -1612,16 +1609,35 @@ static int eth_i40evf_pci_remove(struct rte_pci_device *pci_dev)
> ad->tx_vec_allowed = true;
>
> if (num_queue_pairs > vf->vsi_res->num_queue_pairs) {
> - int ret = 0;
> + struct i40e_hw *hw;
> + int ret;
>
> + hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> PMD_DRV_LOG(INFO, "change queue pairs from %u to %u",
> vf->vsi_res->num_queue_pairs, num_queue_pairs);
> + if (hw->adapter_stopped == 0) {
> + PMD_DRV_LOG(WARNING, "Device must be stopped first!");
> + return -EINVAL;
> + }
> +
> + rte_eal_alarm_cancel(i40evf_dev_alarm_handler, dev);
> ret = i40evf_request_queues(dev, num_queue_pairs);
> - if (ret != 0)
> + if (ret)
> return ret;
>
> - ret = i40evf_dev_reset(dev);
> - if (ret != 0)
> + /*
> + * The device must be reinitiated after queue resources
> + * changed
> + */
Should you check below part is reinitialize process according to exist
dev_close and dev_init.
> + i40e_shutdown_adminq(hw);
> + i40evf_disable_irq0(hw);
> + rte_free(vf->vf_res);
> + vf->vf_res = NULL;
> + rte_free(vf->aq_resp);
> + vf->aq_resp = NULL;
> +
> + ret = i40evf_dev_init(dev);
> + if (ret)
> return ret;
> }
>
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