[PATCH] net/iavf: fix checksum offloading

[Zhang, Qi Z]

> -----Original Message-----
> From: David Marchand <david.marchand at redhat.com>
> Sent: Friday, August 18, 2023 5:04 PM
> To: dev at dpdk.org
> Cc: echaudro at redhat.com; mkp at redhat.com; stable at dpdk.org; Wu, Jingjing
> <jingjing.wu at intel.com>; Xing, Beilei <beilei.xing at intel.com>; Doherty, Declan
> <declan.doherty at intel.com>; Sinha, Abhijit <abhijit.sinha at intel.com>; Nicolau,
> Radu <radu.nicolau at intel.com>
> Subject: [PATCH] net/iavf: fix checksum offloading
> 
> The only presence of RTE_MBUF_F_TX_IPV4 can't be used as an indicator that
> a checksum offload has been requested by an application.

According to current implementation, actually the only presence of RTE_MBUF_F_TX_IPV4 will cause IIPT = 10b, this scenario corresponds to an 'IPv4 packet with no IP checksum offload,' according to datasheet.
So, I assume in this situation, the PMD  continues to operate under the assumption that the application has not requested checksum offloading.

Could you share more insight what is the failure,  maybe we can perform a more comprehensive investigation?

Thanks
Qi



> Check that RTE_MBUF_F_TX_IP_CKSUM or others flags have been set. 
> 
> Fixes: 1e728b01120c ("net/iavf: rework Tx path")
> Cc: stable at dpdk.org
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---
>  drivers/net/iavf/iavf_rxtx.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c index
> f7df4665d1..b9e2879764 100644
> --- a/drivers/net/iavf/iavf_rxtx.c
> +++ b/drivers/net/iavf/iavf_rxtx.c
> @@ -2652,6 +2652,9 @@ iavf_build_data_desc_cmd_offset_fields(volatile
> uint64_t *qw1,
>  		offset |= (m->l2_len >> 1)
>  			<< IAVF_TX_DESC_LENGTH_MACLEN_SHIFT;
> 
> +	if ((m->ol_flags & IAVF_TX_CKSUM_OFFLOAD_MASK) == 0)
> +		goto skip_cksum;
> +
>  	/* Enable L3 checksum offloading inner */
>  	if (m->ol_flags & RTE_MBUF_F_TX_IP_CKSUM) {
>  		if (m->ol_flags & RTE_MBUF_F_TX_IPV4) { @@ -2702,6
> +2705,7 @@ iavf_build_data_desc_cmd_offset_fields(volatile uint64_t *qw1,
>  		break;
>  	}
> 
> +skip_cksum:
>  	*qw1 = rte_cpu_to_le_64((((uint64_t)command <<
>  		IAVF_TXD_DATA_QW1_CMD_SHIFT) &
> IAVF_TXD_DATA_QW1_CMD_MASK) |
>  		(((uint64_t)offset << IAVF_TXD_DATA_QW1_OFFSET_SHIFT) &
> --
> 2.41.0