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Date: Sat, 25 Aug 2012 23:39:08 +0530
From: Naresh Kumar Inna <naresh@...lsio.com>
To: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
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 8/25/2012 2:47 AM, Nicholas A. Bellinger wrote:
> 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.
>
OK I will switch over to the errno values.
>>>
>>>> +
>>>> +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>
> }
>
I will try to come up with a simpler static inline version of the macro.
Would that work?
>>>> +#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..
>
I will remove it.
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