linux-kernel - RE: [[PATCH v1] 23/37] [CIFS] SMBD: Implement API for upper layer to reconnect transport

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Date:   Mon, 14 Aug 2017 21:02:31 +0000
From:   Tom Talpey <ttalpey@...rosoft.com>
To:     Long Li <longli@...rosoft.com>, Steve French <sfrench@...ba.org>,
        "linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
        "samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [[PATCH v1] 23/37] [CIFS] SMBD: Implement API for upper layer to
 reconnect transport

> -----Original Message-----
> From: linux-cifs-owner@...r.kernel.org [mailto:linux-cifs-
> owner@...r.kernel.org] On Behalf Of Long Li
> Sent: Wednesday, August 2, 2017 4:11 PM
> To: Steve French <sfrench@...ba.org>; linux-cifs@...r.kernel.org; samba-
> technical@...ts.samba.org; linux-kernel@...r.kernel.org
> Cc: Long Li <longli@...rosoft.com>
> Subject: [[PATCH v1] 23/37] [CIFS] SMBD: Implement API for upper layer to
> reconnect transport
> 
> +int cifs_reconnect_rdma_session(struct TCP_Server_Info *server)
> +{
> +       log_rdma_event("reconnecting rdma session\n");
> +
> +       // why reconnect while it is still connected?
> +       if (server->rdma_ses->transport_status == CIFS_RDMA_CONNECTED) {
> +               log_rdma_event("still connected, not reconnecting\n");
> +               return -EINVAL;
> +       }

Why is this check needed?

> +
> +       // wait until the transport is destroyed
> +       while (server->rdma_ses->transport_status != CIFS_RDMA_DESTROYED)
> +               msleep(1);

Polling!? Please plan to implement a proper handshake for connection logic.