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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: Usama Nadeem <usama.nadeem@emumba.com>, "thomas@monjalon.net"
 <thomas@monjalon.net>
CC: "dev@dpdk.org" <dev@dpdk.org>
Thread-Topic: [dpdk-dev] [PATCH v2] Warns if IPv4, UDP or TCP checksum offload
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Date: Tue, 14 Sep 2021 22:22:04 +0000
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Subject: Re: [dpdk-dev] [PATCH v2] Warns if IPv4,
 UDP or TCP checksum offload not available
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>=20
> From: usamanadeem321 <usama.nadeem@emumba.com>
>=20
> Checks if IPV4, UDP and TCP Checksum offloads are available.
> If not available, prints a warning message.
>=20
> Bugzilla ID: 545
> Signed-off-by: usamanadeem321 <usama.nadeem@emumba.com>
> ---
>  examples/l3fwd/main.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
>=20
> diff --git a/examples/l3fwd/main.c b/examples/l3fwd/main.c
> index 00ac267af1..ae62bc570d 100644
> --- a/examples/l3fwd/main.c
> +++ b/examples/l3fwd/main.c
> @@ -123,7 +123,6 @@ static struct rte_eth_conf port_conf =3D {
>  		.mq_mode =3D ETH_MQ_RX_RSS,
>  		.max_rx_pkt_len =3D RTE_ETHER_MAX_LEN,
>  		.split_hdr_size =3D 0,
> -		.offloads =3D DEV_RX_OFFLOAD_CHECKSUM,
>  	},
>  	.rx_adv_conf =3D {
>  		.rss_conf =3D {
> @@ -1039,6 +1038,27 @@ l3fwd_poll_resource_setup(void)
>  			local_port_conf.txmode.offloads |=3D
>  				DEV_TX_OFFLOAD_MBUF_FAST_FREE;
>=20
> +		if (dev_info.rx_offload_capa & DEV_RX_OFFLOAD_IPV4_CKSUM)
> +			local_port_conf.rxmode.offloads |=3D
> +			 DEV_RX_OFFLOAD_IPV4_CKSUM;
> +		else {
> +			printf("WARNING: IPV4 Checksum offload not available.\n");
> +		}
> +
> +		if (dev_info.rx_offload_capa & DEV_RX_OFFLOAD_UDP_CKSUM)
> +			local_port_conf.rxmode.offloads |=3D
> +			DEV_RX_OFFLOAD_UDP_CKSUM;
> +
> +		else
> +			printf("WARNING: UDP Checksum offload not available.\n");
> +
> +		if (dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_CKSUM)
> +			local_port_conf.rxmode.offloads |=3D
> +			DEV_RX_OFFLOAD_TCP_CKSUM;
> +
> +		else
> +			printf("WARNING: TCP Checksum offload not available.\n");
> +

Sorry, but I didn't get the logic:
Application expects some offloads to be supported by HW.
You add the code that checks for offloads, but if they are not supported ju=
st prints warning
and continues, as if everything is ok. Doesn't look like correct behaviour =
to me.
I think, it should either terminate with error message or be prepared to wo=
rk properly
on HW without these offloads (check cksums in SW if necessary).
In fact I don't see what was wrong with original behaviour, one thing that =
probably
was missing - more descriptive error message.=20

>  		local_port_conf.rx_adv_conf.rss_conf.rss_hf &=3D
>  			dev_info.flow_type_rss_offloads;
>=20
> --
> 2.25.1