[PATCH 22.11] net/gve: fix RX buffer size alignment

[Guo, Junfeng]

> -----Original Message-----
> From: Joshua Washington <joshwash at google.com>
> Sent: Wednesday, December 13, 2023 04:07
> To: Guo, Junfeng <junfeng.guo at intel.com>; Li, Xiaoyun
> <xiaoyun.li at intel.com>; Rushil Gupta <rushilg at google.com>; Joshua
> Washington <joshwash at google.com>; Jeroen de Borst
> <jeroendb at google.com>
> Cc: stable at dpdk.org; Xueming Li <xuemingl at nvidia.com>
> Subject: [PATCH 22.11] net/gve: fix RX buffer size alignment
> 
> The GVE driver has RX buffer size alignment requirements which will
> not always be respected when a user specifies an mbuf size. Assuming
> that an mbuf size is greater than the DPDK recommended default
> (2048 + 128), if the buffer size is not properly aligned with what the
> device expects, the device will silently fail to create any transmit or
> receive queues.
> 
> Because no queues are created, there is no network traffic for the DPDK
> program, and errors like the following are returned when attempting to
> destroy queues:
> 
> gve_adminq_parse_err(): AQ command failed with status -11
> gve_stop_tx_queues(): failed to destroy txqs
> gve_adminq_parse_err(): AQ command failed with status -11
> gve_stop_rx_queues(): failed to destroy rxqs
> 
> This change aims to remedy this by restricting the RX receive buffer
> sizes to valid sizes for the GQ queue format, including both alignment
> and minimum and maximum supported buffer sizes.
> 
> Fixes: 4bec2d0b5572 ("net/gve: support queue operations")
> Fixes: 1dc00f4fc74b ("net/gve: add Rx queue setup for DQO")
> Cc: junfeng.guo at intel.com
> Cc: stable at dpdk.org
> 
> Signed-off-by: Joshua Washington <joshwash at google.com>
> Reviewed-by: Rushil Gupta <rushilg at google.com>
> ---
>  drivers/net/gve/gve_ethdev.c | 2 +-
>  drivers/net/gve/gve_ethdev.h | 4 +++-
>  drivers/net/gve/gve_rx.c     | 7 ++++++-
>  3 files changed, 10 insertions(+), 3 deletions(-)
> 
> --
> 2.43.0.472.g3155946c3a-goog

Acked-by: Junfeng Guo <junfeng.guo at intel.com>

Regards,
Junfeng Guo