linux-kernel - Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCP ports from the host TCP port space.

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Message-ID: <20070807145441.GA24895@2ka.mipt.ru>
Date:	Tue, 7 Aug 2007 18:54:41 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Steve Wise <swise@...ngridcomputing.com>
Cc:	Roland Dreier <rdreier@...co.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	OpenFabrics General <general@...ts.openfabrics.org>
Subject: Re: [PATCH RFC] RDMA/CMA: Allocate PS_TCP ports from the host TCP port space.

Hi Steve.

On Tue, Aug 07, 2007 at 09:37:41AM -0500, Steve Wise (swise@...ngridcomputing.com) wrote:
> +static int cma_get_tcp_port(struct rdma_id_private *id_priv)
> +{
> +	int ret;
> +	struct socket *sock;
> +
> +	ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
> +	if (ret)
> +		return ret;
> +	ret = sock->ops->bind(sock,
> +			  (struct socketaddr 
> *)&id_priv->id.route.addr.src_addr,
> +			  ip_addr_size(&id_priv->id.route.addr.src_addr));

If get away from talks about broken offloading, this one will result in
the case, when usual network dataflow can enter private rdma land, i.e.
after bind succeeded this socket is accessible via any other network
device. Is it inteded?
And this is quite noticeble overhead per rdma connection, btw.

-- 
	Evgeniy Polyakov
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