linux-kernel - Re: [PATCH v3] nvme-tcp: fix connect failure on receiving partial ICResp PDU

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Message-ID: <Z5PeLAaAv0SwV-y6@kbusch-mbp>
Date: Fri, 24 Jan 2025 11:38:36 -0700
From: Keith Busch <kbusch@...nel.org>
To: Caleb Sander Mateos <csander@...estorage.com>
Cc: Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Maurizio Lombardi <mlombard@...hat.com>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] nvme-tcp: fix connect failure on receiving partial
 ICResp PDU

On Fri, Jan 24, 2025 at 11:03:41AM -0700, Caleb Sander Mateos wrote:
> +	msg.msg_flags = MSG_WAITALL;
>  	ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
>  			iov.iov_len, msg.msg_flags);
> -	if (ret < 0) {
> +	if (ret < sizeof(*icresp)) {
>  		pr_warn("queue %d: failed to receive icresp, error %d\n",
>  			nvme_tcp_queue_id(queue), ret);
> +		ret = -ECONNRESET;

If kernel_recvmsg() returns an error, don't we want to preserve and
return that instead of unconditionally overriding to -ECONNRESET? I
think the suggestion was to set ret to that only if ret >= 0.