[dpdk-dev] [PATCH v2 1/2] net/af_packet: fix driver init with default MTU

[Andrew Rybchenko]

On 10/27/21 12:14 PM, Ferruh Yigit wrote:
> Driver is using 'ETH_FRAME_LEN' Linux defined value as max frame length,
> which doesn't include FCS (4 bytes CRC). But ethdev by default uses
> frame size with FCS when application doesn't define any explicit value.
> 
> As a result device configuration fails because device is tried to be
> configured with a frame size length that is bigger than what device
> reported as supported. Device reports as max supported frame size is
> 1514 but configured value is 1518.
> 
> Instead use DPDK macro, 'RTE_ETHER_MAX_LEN', that includes FCS in the
> driver to report the max supported frame size, this matches to the
> initial intention.
> 
> Fixes: 1bb4a528c41f ("ethdev: fix max Rx packet length")
> 
> Reported-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
> Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>

Reviewed-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>