[dpdk-dev] ixgbe: fix a x550 DCB issue

  There's a DCB issue on x550. For 8 TCs, if a packet with user priority 6
or 7 is injected to the NIC, then the NIC will put 3 packets into the
queue. There's also a similar issue for 4 TCs.
The root cause is RXPBSIZE is not right. RXPBSIZE of x550 is 384. It's
different from other 10G NICs. We need to set the RXPBSIZE according to
the NIC type.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
---
 drivers/net/ixgbe/ixgbe_rxtx.c | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)
  

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Wenzhuo Lu
> Sent: Wednesday, August 26, 2015 3:11 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] [PATCH] ixgbe: fix a x550 DCB issue
> 
> There's a DCB issue on x550. For 8 TCs, if a packet with user priority 6 or 7 is
> injected to the NIC, then the NIC will put 3 packets into the queue. There's
> also a similar issue for 4 TCs.
> The root cause is RXPBSIZE is not right. RXPBSIZE of x550 is 384. It's different
> from other 10G NICs. We need to set the RXPBSIZE according to the NIC type.
> 
> Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
Acked-by: Jingjing Wu <jingjing.wu@intel.com>
> ---
>  drivers/net/ixgbe/ixgbe_rxtx.c | 27 +++++++++++++++++++++++----
>  1 file changed, 23 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
> index 91023b9..021229f 100644
> --- a/drivers/net/ixgbe/ixgbe_rxtx.c
> +++ b/drivers/net/ixgbe/ixgbe_rxtx.c
> @@ -2915,6 +2915,7 @@ ixgbe_rss_configure(struct rte_eth_dev *dev)
> 
>  #define NUM_VFTA_REGISTERS 128
>  #define NIC_RX_BUFFER_SIZE 0x200
> +#define X550_RX_BUFFER_SIZE 0x180
> 
>  static void
>  ixgbe_vmdq_dcb_configure(struct rte_eth_dev *dev) @@ -2943,7 +2944,15
> @@ ixgbe_vmdq_dcb_configure(struct rte_eth_dev *dev)
>  	 * RXPBSIZE
>  	 * split rx buffer up into sections, each for 1 traffic class
>  	 */
> -	pbsize = (uint16_t)(NIC_RX_BUFFER_SIZE / nb_tcs);
> +	switch (hw->mac.type) {
> +	case ixgbe_mac_X550:
> +	case ixgbe_mac_X550EM_x:
> +		pbsize = (uint16_t)(X550_RX_BUFFER_SIZE / nb_tcs);
> +		break;
> +	default:
> +		pbsize = (uint16_t)(NIC_RX_BUFFER_SIZE / nb_tcs);
> +		break;
> +	}
>  	for (i = 0 ; i < nb_tcs; i++) {
>  		uint32_t rxpbsize = IXGBE_READ_REG(hw,
> IXGBE_RXPBSIZE(i));
>  		rxpbsize &= (~(0x3FF << IXGBE_RXPBSIZE_SHIFT)); @@ -
> 3317,7 +3326,7 @@ ixgbe_dcb_hw_configure(struct rte_eth_dev *dev,  {
>  	int     ret = 0;
>  	uint8_t i,pfc_en,nb_tcs;
> -	uint16_t pbsize;
> +	uint16_t pbsize, rx_buffer_size;
>  	uint8_t config_dcb_rx = 0;
>  	uint8_t config_dcb_tx = 0;
>  	uint8_t tsa[IXGBE_DCB_MAX_TRAFFIC_CLASS] = {0}; @@ -3408,9
> +3417,19 @@ ixgbe_dcb_hw_configure(struct rte_eth_dev *dev,
>  		}
>  	}
> 
> +	switch (hw->mac.type) {
> +	case ixgbe_mac_X550:
> +	case ixgbe_mac_X550EM_x:
> +		rx_buffer_size = X550_RX_BUFFER_SIZE;
> +		break;
> +	default:
> +		rx_buffer_size = NIC_RX_BUFFER_SIZE;
> +		break;
> +	}
> +
>  	if(config_dcb_rx) {
>  		/* Set RX buffer size */
> -		pbsize = (uint16_t)(NIC_RX_BUFFER_SIZE / nb_tcs);
> +		pbsize = (uint16_t)(rx_buffer_size / nb_tcs);
>  		uint32_t rxpbsize = pbsize << IXGBE_RXPBSIZE_SHIFT;
>  		for (i = 0 ; i < nb_tcs; i++) {
>  			IXGBE_WRITE_REG(hw, IXGBE_RXPBSIZE(i), rxpbsize);
> @@ -3466,7 +3485,7 @@ ixgbe_dcb_hw_configure(struct rte_eth_dev *dev,
> 
>  	/* Check if the PFC is supported */
>  	if(dev->data->dev_conf.dcb_capability_en &
> ETH_DCB_PFC_SUPPORT) {
> -		pbsize = (uint16_t) (NIC_RX_BUFFER_SIZE / nb_tcs);
> +		pbsize = (uint16_t) (rx_buffer_size / nb_tcs);
>  		for (i = 0; i < nb_tcs; i++) {
>  			/*
>  			* If the TC count is 8,and the default high_water is 48,
> --
> 1.9.3
  

> > There's a DCB issue on x550. For 8 TCs, if a packet with user priority 6 or 7 is
> > injected to the NIC, then the NIC will put 3 packets into the queue. There's
> > also a similar issue for 4 TCs.
> > The root cause is RXPBSIZE is not right. RXPBSIZE of x550 is 384. It's different
> > from other 10G NICs. We need to set the RXPBSIZE according to the NIC type.
> > 
> > Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
> Acked-by: Jingjing Wu <jingjing.wu@intel.com>

Applied, thanks