linux-kernel - Re: [PATCH 2/3] nvme-tcp: support specifying the congestion-control

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Date:   Fri, 11 Mar 2022 08:15:18 +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,
        Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...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 2/3] nvme-tcp: support specifying the congestion-control

On Fri, Mar 11, 2022 at 11:01:12AM +0800, Mingbao Sun wrote:
> +		case NVMF_OPT_TCP_CONGESTION:
> +			p = match_strdup(args);
> +			if (!p) {
> +				ret = -ENOMEM;
> +				goto out;
> +			}
> +
> +			kfree(opts->tcp_congestion);
> +			opts->tcp_congestion = p;

We'll need to check that the string is no loner than TCP_CA_NAME_MAX
somewhere.

>  
> +	if (nctrl->opts->mask & NVMF_OPT_TCP_CONGESTION) {
> +		ret = tcp_set_congestion_control(queue->sock->sk,
> +						 nctrl->opts->tcp_congestion,
> +						 true, true);

This needs to be called under lock_sock() protection.  Maybe also
add an assert to tcp_set_congestion_control to enforce that.