linux-kernel - Re: [PATCH 2/2] nvme-tcp: support specifying the congestion-control

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Date:   Fri, 4 Mar 2022 17:20:32 +0100
From:   Christoph Hellwig <hch@....de>
To:     Mingbao Sun <sunmingbao@....com>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        tyler.sun@...l.com, ping.gan@...l.com, yanxiu.cai@...l.com,
        libin.zhang@...l.com, ao.sun@...l.com
Subject: Re: [PATCH 2/2] nvme-tcp: support specifying the congestion-control

I'll let the NVMe/TCP maintainer comment on the actual functionality,
but:

> +			p = match_strdup(args);
> +			if (!p) {
> +				ret = -ENOMEM;
> +				goto out;
> +			}
> +
> +			key = tcp_ca_get_key_by_name(NULL, p, &ecn_ca);
> +			if (key == TCP_CA_UNSPEC) {
> +				pr_err("congestion control %s not found.\n",
> +				       p);
> +				ret = -EINVAL;
> +				kfree(p);
> +				goto out;
> +			}

We can't just call networking code from nvme-fabrics.ko