[dpdk-dev] [RFC] app/testpmd: fix MTU after device configure

[Ferruh Yigit]

On 11/5/2020 6:09 PM, Ferruh Yigit wrote:
> In 'rte_eth_dev_configure()', if 'DEV_RX_OFFLOAD_JUMBO_FRAME' is not set
> the max frame size is limited to 'RTE_ETHER_MAX_LEN' (1518).
> This is mistake because for the PMDs that has frame size bigger than
> "RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN" (18 bytes), the MTU becomes
> less than 1500, causing a valid frame with 1500 bytes payload to be
> dropped.
> 
> Since 'rte_eth_dev_set_mtu()' works as expected, it is called after
> 'rte_eth_dev_configure()' to fix the MTU.
> It may look redundant to set MTU after 'rte_eth_dev_configure()', both
> with default values, but it is not, the resulting MTU config can be
> different in the device based on frame overhead of the PMD.
> 
> And instead of setting the MTU to default value, it is first get via
> 'rte_eth_dev_get_mtu()' and set again, this is to cover cases MTU
> changed from testpmd command line.
> 
> 'rte_eth_dev_set_mtu()', '-ENOTSUP' error is ignored to prevent
> irrelevant warning messages for the virtual PMDs.
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>
> ---
> Cc: Steve Yang <stevex.yang at intel.com>
> Cc: Thomas Monjalon <thomas at monjalon.net>
> Cc: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
> Cc: Konstantin Ananyev <konstantin.ananyev at intel.com>
> Cc: Olivier Matz <olivier.matz at 6wind.com>
> Cc: Lance Richardson <lance.richardson at broadcom.com>
> ---
>   app/test-pmd/testpmd.c | 19 +++++++++++++++++++
>   1 file changed, 19 insertions(+)
> 
> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
> index 33fc0fddf5..48e9647fc7 100644
> --- a/app/test-pmd/testpmd.c
> +++ b/app/test-pmd/testpmd.c
> @@ -2537,6 +2537,8 @@ start_port(portid_t pid)
>   		}
>   
>   		if (port->need_reconfig > 0) {
> +			uint16_t mtu = RTE_ETHER_MTU;
> +
>   			port->need_reconfig = 0;
>   
>   			if (flow_isolate_all) {
> @@ -2570,6 +2572,23 @@ start_port(portid_t pid)
>   				port->need_reconfig = 1;
>   				return -1;
>   			}
> +
> +			/*
> +			 * Workaround for rte_eth_dev_configure(), max_rx_pkt_len
> +			 * set MTU wrong for the PMDs that have frame overhead
> +			 * bigger than RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN.
> +			 * For a PMD that has 26 bytes overhead, rte_eth_dev_configure()
> +			 * can set MTU to max 1492, not to expected 1500 bytes.
> +			 * Using rte_eth_dev_set_mtu() to be able to set MTU correctly,
> +			 * default MTU value is 1500.
> +			 */
> +			diag = rte_eth_dev_get_mtu(pi, &mtu);
> +			if (diag)
> +				printf("Failed to get MTU for port %d\n", pi);
> +			diag = rte_eth_dev_set_mtu(pi, mtu);
> +			if (diag != 0 && diag != -ENOTSUP)
> +				printf("Failed to set MTU to %u for port %d\n",
> +						mtu, pi);
>   		}
>   		if (port->need_reconfig_queues > 0) {
>   			port->need_reconfig_queues = 0;
> 

Hi Steve,

Since your patch [1] for the fix reverted [2], can you please test above patch? 
If it works as expected I will send as actual patch.

Thanks,
ferruh

[1]
https://git.dpdk.org/dpdk/commit/?id=f6870a7ed6b3

[2]
https://git.dpdk.org/dpdk/commit/?id=13e0b599acfd