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Message-ID: <20161208163658-mutt-send-email-mst@kernel.org>
Date: Thu, 8 Dec 2016 18:17:32 +0200
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Bart Van Assche <Bart.VanAssche@...disk.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Christoph Hellwig <hch@...radead.org>,
Jason Wang <jasowang@...hat.com>,
"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
Michal Marek <mmarek@...e.com>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Matt Mackall <mpm@...enic.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
David Airlie <airlied@...ux.ie>,
Gerd Hoffmann <kraxel@...hat.com>,
Ohad Ben-Cohen <ohad@...ery.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
Cornelia Huck <cornelia.huck@...ibm.com>,
"James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
"David S. Miller" <davem@...emloft.net>, Jens Axboe <axboe@...com>,
Neil Armstrong <narmstrong@...libre.com>,
Stefan Hajnoczi <stefanha@...hat.com>,
Asias He <asias@...hat.com>,
"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
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"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"v9fs-developer@...ts.sourceforge.net"
<v9fs-developer@...ts.sourceforge.net>
Subject: Re: [PATCH] linux/types.h: enable endian checks for all sparse builds
On Thu, Dec 08, 2016 at 06:38:11AM +0000, Bart Van Assche wrote:
> On 12/07/16 21:54, Michael S. Tsirkin wrote:
> > On Thu, Dec 08, 2016 at 05:21:47AM +0000, Bart Van Assche wrote:
> >> Additionally, there are notable exceptions to the rule that most drivers
> >> are endian-clean, e.g. drivers/scsi/qla2xxx. I would appreciate it if it
> >> would remain possible to check such drivers with sparse without enabling
> >> endianness checks. Have you considered to change #ifdef __CHECK_ENDIAN__
> >> into e.g. #ifndef __DONT_CHECK_ENDIAN__?
> >
> > The right thing is probably just to fix these, isn't it?
> > Until then, why not just ignore the warnings?
>
> Neither option is realistic. With endian-checking enabled the qla2xxx
> driver triggers so many warnings that it becomes a real challenge to
> filter the non-endian warnings out manually:
>
> $ for f in "" CF=-D__CHECK_ENDIAN__; do make M=drivers/scsi/qla2xxx C=2\
> $f | &grep -c ': warning:'; done
> 4
> 752
You can always revert this patch in your tree, or whatever. It does not
look like this will get fixed otherwise.
> If you think it would be easy to fix the endian warnings triggered by
> the qla2xxx driver, you are welcome to try to fix these.
>
> Bart.
Yea, this hardware was designed by someone who thought mixing
LE and BE all over the place is a good idea.
But who said it should be easy?
Maybe this change will be enough to motivate the maintainers.
Here's a minor buglet for you as a motivator:
if (ct_rsp->header.response !=
cpu_to_be16(CT_ACCEPT_RESPONSE)) {
ql_dbg(ql_dbg_disc + ql_dbg_buffer, vha, 0x2077,
"%s failed rejected request on port_id: %02x%02x%02x Compeltion status 0x%x, response 0x%x\n",
routine, vha->d_id.b.domain,
vha->d_id.b.area, vha->d_id.b.al_pa, comp_status, ct_rsp->header.response);
response is BE and isn't printed correctly.
another:
eiter->a.max_frame_size = cpu_to_be32(eiter->a.max_frame_size);
size += 4 + 4;
ql_dbg(ql_dbg_disc, vha, 0x20bc,
"Max_Frame_Size = %x.\n", eiter->a.max_frame_size);
printed too late, it's be by that time.
Here's another suspicious line
ctio24->u.status1.flags = (atio->u.isp24.attr << 9) |
cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1 |
CTIO7_FLAGS_TERMINATE);
shifting attr by 9 bits gives different results on BE and LE,
mixing it with le16 looks rather strange.
Another:
ha->flags.dport_enabled =
(mid_init_cb->init_cb.firmware_options_1 & BIT_7) != 0;
BIT_7 is native endian, firmware_options_1 is LE I think.
Look at qla27xx_find_valid_image as well.
if (pri_image_status.signature != QLA27XX_IMG_STATUS_SIGN)
qla27xx_image_status seems to be data coming from flash, but is
somehow native-endian? Maybe ...
lun = a->u.isp24.fcp_cmnd.lun;
I think lun here is in hardware format (le?), code treats it
as native.
Not to speak about interface abuse all over the place.
How about this:
uint32_t *
qla24xx_read_flash_data(scsi_qla_host_t *vha, uint32_t *dwptr, uint32_t
faddr,
uint32_t dwords)
{
uint32_t i;
struct qla_hw_data *ha = vha->hw;
/* Dword reads to flash. */
for (i = 0; i < dwords; i++, faddr++)
dwptr[i] = cpu_to_le32(qla24xx_read_flash_dword(ha,
flash_data_addr(ha, faddr)));
return dwptr;
}
OK so we convert to LE ...
qla24xx_read_flash_data(vha, dcode, faddr, 4);
risc_addr = be32_to_cpu(dcode[2]);
*srisc_addr = *srisc_addr == 0 ? risc_addr : *srisc_addr;
risc_size = be32_to_cpu(dcode[3]);
then happily assume it's BE.
And again, coming from flash, it's unlikely to actually be in the native
endian-ness as callers seem to assume. I'm guessing it's all BE.
I poked at it a bit and was able to cut down # of warnings
from 1700 to 1400 in an hour. Someone familiar with the code
should look at it.
--
MST
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