[PATCH v1 net-next 07/15] nvme-tcp : Recalculate crc in the end of the capsule

[Shai Malin]

> crc offload of the nvme capsule. Check if all the skb bits are on, and if not
> recalculate the crc in SW and check it.
> 
> This patch reworks the receive-side crc calculation to always run at the end,
> so as to keep a single flow for both offload and non-offload. This change
> simplifies the code, but it may degrade performance for non-offload crc
> calculation.
> 
> Signed-off-by: Boris Pismenny <borisp at mellanox.com>
> Signed-off-by: Ben Ben-Ishay <benishay at mellanox.com>
> Signed-off-by: Or Gerlitz <ogerlitz at mellanox.com>
> Signed-off-by: Yoray Zack <yorayz at mellanox.com>
> ---
>  drivers/nvme/host/tcp.c | 111 ++++++++++++++++++++++++++++++++----
> ----
>  1 file changed, 91 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index
> 534fd5c00f33..3c10c8876036 100644
> --- a/drivers/nvme/host/tcp.c
> +++ b/drivers/nvme/host/tcp.c
> @@ -69,6 +69,7 @@ enum nvme_tcp_queue_flags {
>  	NVME_TCP_Q_LIVE		= 1,
>  	NVME_TCP_Q_POLLING	= 2,
>  	NVME_TCP_Q_OFFLOADS     = 3,
> +	NVME_TCP_Q_OFF_CRC_RX   = 4,

Because only the data digest is offloaded, and not the header digest, 
in order to avoid confusion, I suggest replacing the term 
NVME_TCP_Q_OFF_CRC_RX with NVME_TCP_Q_OFF_DDGST_RX.

>  };