linux-kernel - RE: [[PATCH v1] 14/37] [CIFS] SMBD: Post a SMBD data transfer message with page payload

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Message-ID: <CY4PR21MB0182CAE71C65A957C80DE005CE8C0@CY4PR21MB0182.namprd21.prod.outlook.com>
Date:   Mon, 14 Aug 2017 22:58:09 +0000
From:   Long Li <longli@...rosoft.com>
To:     Tom Talpey <ttalpey@...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] 14/37] [CIFS] SMBD: Post a SMBD data transfer message
 with page payload



> -----Original Message-----
> From: Tom Talpey
> Sent: Monday, August 14, 2017 1:23 PM
> To: Long Li <longli@...rosoft.com>; Steve French <sfrench@...ba.org>;
> linux-cifs@...r.kernel.org; samba-technical@...ts.samba.org; linux-
> kernel@...r.kernel.org
> Subject: RE: [[PATCH v1] 14/37] [CIFS] SMBD: Post a SMBD data transfer
> message with page payload
> 
> > -----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 4:10 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] 14/37] [CIFS] SMBD: Post a SMBD data transfer
> > message with page payload
> >
> >  /*
> > + * Send a page
> > + * page: the page to send
> > + * offset: offset in the page to send
> > + * size: length in the page to send
> > + * remaining_data_length: remaining data to send in this payload  */
> > +static int cifs_rdma_post_send_page(struct cifs_rdma_info *info,
> > +struct page
> > *page,
> > +               unsigned long offset, size_t size, int
> > +remaining_data_length) {
> >...
> > +       wait_event(info->wait_send_queue,
> > + atomic_read(&info->send_credits) >
> > 0);
> 
> This is an uninterruptible wait, correct? What's to guarantee the event will
> ever fire? Also, if the count is zero, there should be a check that an SMB
> Direct credit request is outstanding. If not, it's wasteful to sleep for the
> keepalive timer to do so.

Will fix it.

> 
> Tom.