[PATCH] net/ice: fix error forwarding IPv6 VXLAN packet

[Zhang, Qi Z]

> -----Original Message-----
> From: Kevin Liu <kevinx.liu at intel.com>
> Sent: Wednesday, December 8, 2021 5:56 PM
> To: dev at dpdk.org
> Cc: Zhang, RobinX <robinx.zhang at intel.com>; Wang, Jie1X
> <jie1x.wang at intel.com>; Liu, KevinX <kevinx.liu at intel.com>
> Subject: [PATCH] net/ice: fix error forwarding IPv6 VXLAN packet
> 
> In ice_txd_enable_offload(), when set tunnel packet Tx checksum offload
> enable, td_offset should be set with outer l2/l3 len instead of inner l2/l3 len.
> 
> This patch fix the bug that the checksum engine can forward tunnle packets.

s/tunnle/tunnel

> 
> Fixes: 28f9002ab67f ("net/ice: add Tx AVX512 offload path")
> 
> Signed-off-by: Kevin Liu <kevinx.liu at intel.com>
> ---
>  drivers/net/ice/ice_rxtx_vec_common.h | 52 +++++++++++++++++++--------
>  1 file changed, 37 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/net/ice/ice_rxtx_vec_common.h
> b/drivers/net/ice/ice_rxtx_vec_common.h
> index dfe60c81d9..8ff01046e1 100644
> --- a/drivers/net/ice/ice_rxtx_vec_common.h
> +++ b/drivers/net/ice/ice_rxtx_vec_common.h
> @@ -364,23 +364,45 @@ ice_txd_enable_offload(struct rte_mbuf *tx_pkt,
>  	uint32_t td_offset = 0;
> 
>  	/* Tx Checksum Offload */
> -	/* SET MACLEN */
> -	td_offset |= (tx_pkt->l2_len >> 1) <<
> +	/*Tunnel package usage outer len enable L2/L3 checksum offload*/
> +	if (ol_flags & RTE_MBUF_F_TX_TUNNEL_MASK) {
> +		/* SET MACLEN */
> +		td_offset |= (tx_pkt->outer_l2_len >> 1) <<
>  			ICE_TX_DESC_LEN_MACLEN_S;
> 
> -	/* Enable L3 checksum offload */
> -	if (ol_flags & RTE_MBUF_F_TX_IP_CKSUM) {
> -		td_cmd |= ICE_TX_DESC_CMD_IIPT_IPV4_CSUM;
> -		td_offset |= (tx_pkt->l3_len >> 2) <<
> -			ICE_TX_DESC_LEN_IPLEN_S;
> -	} else if (ol_flags & RTE_MBUF_F_TX_IPV4) {
> -		td_cmd |= ICE_TX_DESC_CMD_IIPT_IPV4;
> -		td_offset |= (tx_pkt->l3_len >> 2) <<
> -			ICE_TX_DESC_LEN_IPLEN_S;
> -	} else if (ol_flags & RTE_MBUF_F_TX_IPV6) {
> -		td_cmd |= ICE_TX_DESC_CMD_IIPT_IPV6;
> -		td_offset |= (tx_pkt->l3_len >> 2) <<
> -			ICE_TX_DESC_LEN_IPLEN_S;
> +		/* Enable L3 checksum offload */
> +		if (ol_flags & RTE_MBUF_F_TX_IP_CKSUM) {
> +			td_cmd |= ICE_TX_DESC_CMD_IIPT_IPV4_CSUM;
> +			td_offset |= (tx_pkt->outer_l3_len >> 2) <<
> +				ICE_TX_DESC_LEN_IPLEN_S;

Is this fix also cover IPv4 Tx checksum offload? 
Please refine the title to reflect what exactly the patch does if necessary.

Btw, could you also check if any fix needed in ice_txd_enable_checksum?
I saw inconsistent offset configure on l3_len between scaler path and vector path.
Its better to always keep them identical.