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Date: Fri, 24 Aug 2012 14:17:22 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: Naresh Kumar Inna <naresh@...lsio.com>
Cc: "JBottomley@...allels.com" <JBottomley@...allels.com>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
Dimitrios Michailidis <dm@...lsio.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Chethan Seshadri <chethan@...lsio.com>
Subject: Re: [PATCH 6/8] csiostor: Chelsio FCoE offload driver submission
(headers part 1).
On Sat, 2012-08-25 at 00:06 +0530, Naresh Kumar Inna wrote:
> On 8/24/2012 1:28 AM, Nicholas A. Bellinger wrote:
> > On Fri, 2012-08-24 at 03:57 +0530, Naresh Kumar Inna wrote:
> >> This patch contains the first set of the header files for csiostor driver.
> >>
> >> Signed-off-by: Naresh Kumar Inna <naresh@...lsio.com>
> >> ---
> >> drivers/scsi/csiostor/csio_defs.h | 143 ++++++
> >> drivers/scsi/csiostor/csio_fcoe_proto.h | 843 +++++++++++++++++++++++++++++++
> >> drivers/scsi/csiostor/csio_hw.h | 668 ++++++++++++++++++++++++
> >> drivers/scsi/csiostor/csio_init.h | 158 ++++++
> >> 4 files changed, 1812 insertions(+), 0 deletions(-)
> >> create mode 100644 drivers/scsi/csiostor/csio_defs.h
> >> create mode 100644 drivers/scsi/csiostor/csio_fcoe_proto.h
> >> create mode 100644 drivers/scsi/csiostor/csio_hw.h
> >> create mode 100644 drivers/scsi/csiostor/csio_init.h
> >>
> >
> > Hi Naresh,
> >
> > Just commenting on csio_defs.h bits here... As Robert mentioned, you'll
> > need to convert the driver to use (or add to) upstream protocol
> > definitions and drop the csio_fcoe_proto.h bits..
> >
>
> Hi Nicholas,
>
> I would like take up the discussion of the protocol header file in that
> email thread. Please find the rest of my replies inline.
>
> Thanks for reviewing,
> Naresh.
>
> >> diff --git a/drivers/scsi/csiostor/csio_defs.h b/drivers/scsi/csiostor/csio_defs.h
> >> new file mode 100644
> >> index 0000000..4f1c713
> >> --- /dev/null
> >> +++ b/drivers/scsi/csiostor/csio_defs.h
<SNIP>
> >> +#ifndef __CSIO_DEFS_H__
> >> +#define __CSIO_DEFS_H__
> >> +
> >> +#include <linux/kernel.h>
> >> +#include <linux/timer.h>
> >> +#include <linux/list.h>
> >> +#include <linux/bug.h>
> >> +#include <linux/pci.h>
> >> +#include <linux/jiffies.h>
> >> +
> >> +/* Function returns */
> >> +enum csio_retval {
> >> + CSIO_SUCCESS = 0,
> >> + CSIO_INVAL = 1,
> >> + CSIO_BUSY = 2,
> >> + CSIO_NOSUPP = 3,
> >> + CSIO_TIMEOUT = 4,
> >> + CSIO_NOMEM = 5,
> >> + CSIO_NOPERM = 6,
> >> + CSIO_RETRY = 7,
> >> + CSIO_EPROTO = 8,
> >> + CSIO_EIO = 9,
> >> + CSIO_CANCELLED = 10,
> >> +};
> >> +
> >
> > Please don't assign macros for errno's, and give them positive values.
> >
>
> Although some of these return values appear to be mapped to errno
> values, there are others that do not have an errno equivalent (example
> CSIO_CANCELLED). We may have future needs to have more driver/protocol
> specific return values as well. What do you suggest?
>
Convert all functions aside from CSIO_CANCELLED to use normal negative
return values from include/asm-generic/error[-base].h
For the CSIO_CANCELLED case, propagate this status up to the specific
caller using another method..
> >> +#define csio_retval_t enum csio_retval
> >
> > Please get rid of this csio_retval_t nonsense.
>
> I can get rid of the typedef and use enum csio_retval instead.
>
Using a LLD defined retval where %90 of the items are from errno.h is
code duplication. Please get rid of this.
> >
> >> +
> >> +enum {
> >> + CSIO_FALSE = 0,
> >> + CSIO_TRUE = 1,
> >> +};
> >> +
> >
> > Same here, please use normal Boolean macros
> >
> >> +#define CSIO_ROUNDUP(__v, __r) (((__v) + (__r) - 1) / (__r))
> >> +#define CSIO_INVALID_IDX 0xFFFFFFFF
> >> +#define csio_inc_stats(elem, val) ((elem)->stats.val++)
> >> +#define csio_dec_stats(elem, val) ((elem)->stats.val--)
> >
> > No reason for either of this stats inc+dec macros. Please drop them.
>
> I will get rid of them.
>
> >
> >> +#define csio_valid_wwn(__n) ((*__n >> 4) == 0x5 ? CSIO_TRUE : \
> >> + CSIO_FALSE)
> >> +#define CSIO_WORD_TO_BYTE 4
> >> +
> >> +static inline int
> >> +csio_list_deleted(struct list_head *list)
> >> +{
> >> + return ((list->next == list) && (list->prev == list));
> >> +}
> >> +
> >> +#define csio_list_next(elem) (((struct list_head *)(elem))->next)
> >> +#define csio_list_prev(elem) (((struct list_head *)(elem))->prev)
> >> +
> >> +#define csio_deq_from_head(head, elem) \
> >> +do { \
> >> + if (!list_empty(head)) { \
> >> + *((struct list_head **)(elem)) = csio_list_next((head)); \
> >> + csio_list_next((head)) = \
> >> + csio_list_next(csio_list_next((head))); \
> >> + csio_list_prev(csio_list_next((head))) = (head); \
> >> + INIT_LIST_HEAD(*((struct list_head **)(elem))); \
> >> + } else \
> >> + *((struct list_head **)(elem)) = (struct list_head *)NULL;\
> >> +} while (0)
> >> +
> >
> > This code is confusing as hell.. Why can't you just use normal list.h
> > macros for this..?
>
> I have not found an equivalent function in list.h that does the above
> and the following macro. Could you please point me to it? I have seen a
> couple of other drivers define their own macros to achieve what this
> macro does, hence I assumed there isnt a list.h macro that does this.
>
AFAICT all that csio_deq_from_head code is supposed to do is pull an
item off a list, right..? Why not just:
while (!list_empty(list)) {
elem = list_first_entry(list, struct elem_type,
elm_list);
list_del_init(&elem->elm_list);
<do work>
<free *elem memory>
}
> >> +#define csio_deq_from_tail(head, elem) \
> >> +do { \
> >> + if (!list_empty(head)) { \
> >> + *((struct list_head **)(elem)) = csio_list_prev((head)); \
> >> + csio_list_prev((head)) = \
> >> + csio_list_prev(csio_list_prev((head))); \
> >> + csio_list_next(csio_list_prev((head))) = (head); \
> >> + INIT_LIST_HEAD(*((struct list_head **)(elem))); \
> >> + } else \
> >> + *((struct list_head **)(elem)) = (struct list_head *)NULL;\
> >> +} while (0)
> >> +
> >
> > Same here.. Please don't use macros like this.
> >
AFIACT csio_deq_from_tail is unused..?
Please remove it..
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