[PATCH v2] net/gve: fix RX buffer size alignment

[Guo, Junfeng]

> -----Original Message-----
> From: Joshua Washington <joshwash at google.com>
> Sent: Tuesday, November 14, 2023 07:12
> To: Guo, Junfeng <junfeng.guo at intel.com>; Jeroen de Borst
> <jeroendb at google.com>; Rushil Gupta <rushilg at google.com>; Joshua
> Washington <joshwash at google.com>; Li, Xiaoyun <xiaoyun.li at intel.com>
> Cc: dev at dpdk.org; stable at dpdk.org; Ferruh Yigit <ferruh.yigit at amd.com>
> Subject: [PATCH v2] net/gve: fix RX buffer size alignment
> 
> In GVE, both queue formats have 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 their respective queue formats, 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>

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

Regards,
Junfeng Guo

> ---
>  drivers/net/gve/gve_ethdev.c | 5 ++++-
>  drivers/net/gve/gve_ethdev.h | 8 +++++++-
>  drivers/net/gve/gve_rx.c     | 7 ++++++-
>  drivers/net/gve/gve_rx_dqo.c | 6 +++++-
>  4 files changed, 22 insertions(+), 4 deletions(-)
> 
> --
> 2.42.0.869.gea05f2083d-goog