Re: [dpdk-dev] [PATCH v4 3/6] ixgbe: Get VF queue number

[Vlad Zolotarov <vladz@cloudius-systems.com>]

On 01/04/15 09:18, Ouyang Changchun wrote:
> Get the available Rx and Tx queue number when receiving IXGBE_VF_GET_QUEUES message from VF.
>
> Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
> ---
>   lib/librte_pmd_ixgbe/ixgbe_pf.c | 35 ++++++++++++++++++++++++++++++++++-
>   1 file changed, 34 insertions(+), 1 deletion(-)
>
> diff --git a/lib/librte_pmd_ixgbe/ixgbe_pf.c b/lib/librte_pmd_ixgbe/ixgbe_pf.c
> index 495aff5..cbb0145 100644
> --- a/lib/librte_pmd_ixgbe/ixgbe_pf.c
> +++ b/lib/librte_pmd_ixgbe/ixgbe_pf.c
> @@ -53,6 +53,8 @@
>   #include "ixgbe_ethdev.h"
>   
>   #define IXGBE_MAX_VFTA     (128)
> +#define IXGBE_VF_MSG_SIZE_DEFAULT 1
> +#define IXGBE_VF_GET_QUEUE_MSG_SIZE 5
>   
>   static inline uint16_t
>   dev_num_vf(struct rte_eth_dev *eth_dev)
> @@ -491,9 +493,36 @@ ixgbe_negotiate_vf_api(struct rte_eth_dev *dev, uint32_t vf, uint32_t *msgbuf)
>   }
>   
>   static int
> +ixgbe_get_vf_queues(struct rte_eth_dev *dev, uint32_t vf, uint32_t *msgbuf)
> +{
> +	struct ixgbe_vf_info *vfinfo =
> +		*IXGBE_DEV_PRIVATE_TO_P_VFDATA(dev->data->dev_private);
> +	uint32_t default_q = vf * RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool;
> +
> +	/* Verify if the PF supports the mbox APIs version or not */
> +	switch (vfinfo[vf].api_version) {
> +	case ixgbe_mbox_api_20:
> +	case ixgbe_mbox_api_11:
> +		break;
> +	default:
> +		return -1;
> +	}
> +
> +	/* Notify VF of Rx and Tx queue number */
> +	msgbuf[IXGBE_VF_RX_QUEUES] = RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool;
> +	msgbuf[IXGBE_VF_TX_QUEUES] = RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool;
> +
> +	/* Notify VF of default queue */
> +	msgbuf[IXGBE_VF_DEF_QUEUE] = default_q;

What about IXGBE_VF_TRANS_VLAN field?

> +
> +	return 0;
> +}
> +
> +static int
>   ixgbe_rcv_msg_from_vf(struct rte_eth_dev *dev, uint16_t vf)
>   {
>   	uint16_t mbx_size = IXGBE_VFMAILBOX_SIZE;
> +	uint16_t msg_size = IXGBE_VF_MSG_SIZE_DEFAULT;
>   	uint32_t msgbuf[IXGBE_VFMAILBOX_SIZE];
>   	int32_t retval;
>   	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> @@ -537,6 +566,10 @@ ixgbe_rcv_msg_from_vf(struct rte_eth_dev *dev, uint16_t vf)
>   	case IXGBE_VF_API_NEGOTIATE:
>   		retval = ixgbe_negotiate_vf_api(dev, vf, msgbuf);
>   		break;
> +	case IXGBE_VF_GET_QUEUES:
> +		retval = ixgbe_get_vf_queues(dev, vf, msgbuf);
> +		msg_size = IXGBE_VF_GET_QUEUE_MSG_SIZE;

Although the msg_size semantics and motivation is clear, if u want to do 
then do it all the way - add it to all other cases too not just to 
IXGBE_VF_GET_QUEUES.
For instance, why do u write all 16 DWORDS for API negotiation (only 2 
are required) and only here u decided to get "greedy"? ;)

My point is: either drop it completely or fix all other places as well.

> +		break;
>   	default:
>   		PMD_DRV_LOG(DEBUG, "Unhandled Msg %8.8x", (unsigned)msgbuf[0]);
>   		retval = IXGBE_ERR_MBX;
> @@ -551,7 +584,7 @@ ixgbe_rcv_msg_from_vf(struct rte_eth_dev *dev, uint16_t vf)
>   
>   	msgbuf[0] |= IXGBE_VT_MSGTYPE_CTS;
>   
> -	ixgbe_write_mbx(hw, msgbuf, 1, vf);
> +	ixgbe_write_mbx(hw, msgbuf, msg_size, vf);
>   
>   	return retval;
>   }