[PATCH RFC] nvme-tcp: Implement recvmsg() receive flow

[Christoph Hellwig]

On Fri, Sep 12, 2025 at 01:58:29PM +0200, Hannes Reinecke wrote:
> Switch to use recvmsg() so that we get access to TLS control
> messages eg for handling TLS KeyUpdate.

That is a very spare commit message for a huge change.  Why did it not
use recvmsg before?  I'm pretty sure there are some tradeoffs here.

> +static size_t nvme_tcp_ddgst_step(void *iter_base, size_t progress, size_t len,
> +				  void *priv, void *priv2)
> +{
> +	u32 *crcp = priv;
> +
> +	*crcp = crc32c(*crcp, iter_base, len);
> +        return 0;

And fix the whitespace damage while you're at it.