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Date: Thu, 23 Aug 2012 12:58:49 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: Naresh Kumar Inna <naresh@...lsio.com>
Cc: JBottomley@...allels.com, linux-scsi@...r.kernel.org,
dm@...lsio.com, netdev@...r.kernel.org, chethan@...lsio.com
Subject: Re: [PATCH 6/8] csiostor: Chelsio FCoE offload driver submission
(headers part 1).
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..
> 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
> @@ -0,0 +1,143 @@
> +/*
> + * This file is part of the Chelsio FCoE driver for Linux.
> + *
> + * Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
> + *
> + * This software is available to you under a choice of one of two
> + * licenses. You may choose to be licensed under the terms of the GNU
> + * General Public License (GPL) Version 2, available from the file
> + * COPYING in the main directory of this source tree, or the
> + * OpenIB.org BSD license below:
> + *
> + * Redistribution and use in source and binary forms, with or
> + * without modification, are permitted provided that the following
> + * conditions are met:
> + *
> + * - Redistributions of source code must retain the above
> + * copyright notice, this list of conditions and the following
> + * disclaimer.
> + *
> + * - Redistributions in binary form must reproduce the above
> + * copyright notice, this list of conditions and the following
> + * disclaimer in the documentation and/or other materials
> + * provided with the distribution.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
> + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
> + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> + * SOFTWARE.
> + */
> +
> +#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.
> +#define csio_retval_t enum csio_retval
Please get rid of this csio_retval_t nonsense.
> +
> +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.
> +#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..?
> +#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.
> +/* State machine */
> +typedef void (*csio_sm_state_t)(void *, uint32_t);
> +
> +struct csio_sm {
> + struct list_head sm_list;
> + csio_sm_state_t sm_state;
> +};
> +
> +#define csio_init_state(__smp, __state) \
> + (((struct csio_sm *)(__smp))->sm_state = (csio_sm_state_t)(__state))
> +
> +#define csio_set_state(__smp, __state) \
> + (((struct csio_sm *)(__smp))->sm_state = (csio_sm_state_t)(__state))
> +
> +
> +#define csio_post_event(__smp, __evt) \
> + (((struct csio_sm *)(__smp))->sm_state((__smp), (uint32_t)(__evt)))
> +
> +#define csio_get_state(__smp) (((struct csio_sm *)(__smp))->sm_state)
> +
> +#define csio_match_state(__smp, __state) \
> + (csio_get_state((__smp)) == (csio_sm_state_t)(__state))
> +
Why does any of the sm_state stuff need to be in macros..? Please
inline all of this code.
> +#define CSIO_ASSERT(cond) \
> +do { \
> + if (unlikely(!((cond)))) \
> + BUG(); \
> +} while (0)
> +
> +#ifdef __CSIO_DEBUG__
> +#define CSIO_DB_ASSERT(__c) CSIO_ASSERT((__c))
> +#else
> +#define CSIO_DB_ASSERT(__c)
> +#endif
> +
> +#endif /* ifndef __CSIO_DEFS_H__ */
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