netdev - Re: [PATCH 3/3] cxgb4i_v3: iscsi and libcxgbi library for handling common part

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Date:	Thu, 27 May 2010 11:35:25 +0530
From:	Rakesh Ranjan <rranjan@...lsio.com>
To:	Mike Christie <michaelc@...wisc.edu>
CC:	open-iscsi@...glegroups.com, Rakesh Ranjan <rakesh@...lsio.com>,
	NETDEVML <netdev@...r.kernel.org>,
	SCSIDEVML <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Karen Xie <kxie@...lsio.com>,
	David Miller <davem@...emloft.net>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Anish Bhatt <anish@...lsio.com>
Subject: Re: [PATCH 3/3] cxgb4i_v3: iscsi and libcxgbi library for handling
 common part

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On 05/27/2010 11:29 AM, Mike Christie wrote:
> On 05/15/2010 12:24 PM, Rakesh Ranjan wrote:
>> From: Rakesh Ranjan<rranjan@...lsio.com>
>>
>>
>> Signed-off-by: Rakesh Ranjan<rakesh@...lsio.com>
>> ---
>>   drivers/scsi/cxgb4i/cxgb4i_iscsi.c |  617
>> ++++++++++++++++++++++++++++++++++++
>>   drivers/scsi/cxgb4i/libcxgbi.c     |  589
>> ++++++++++++++++++++++++++++++++++
>>   drivers/scsi/cxgb4i/libcxgbi.h     |  430 +++++++++++++++++++++++++
> 
> I think the patch had some whitespace/newline issues. When I did git-am
> I got:
> 
> warning: squelched 1 whitespace error
> warning: 6 lines add whitespace errors.
> 
> I think James can just fix up when he merges with git, but in the future
> you might want to try a git-am on your patch before you send (git-am
> --whitespace=fix will fix it up for you).
> 
> 
> 
>> +
>> +int cxgbi_pdu_init(struct cxgbi_device *cdev)
>> +{
>> +    if (cdev->skb_tx_headroom>  (512 * MAX_SKB_FRAGS))
>> +        cdev->skb_extra_headroom = cdev->skb_tx_headroom;
>> +    cdev->pad_page = alloc_page(GFP_KERNEL);
>> +    if (cdev->pad_page)
>> +        return -ENOMEM;
>> +    memset(page_address(cdev->pad_page), 0, PAGE_SIZE);
>> +    return 0;
>> +
>> +    /*
>> +    if (SKB_TX_HEADROOM>  (512 * MAX_SKB_FRAGS))
>> +        skb_extra_headroom = SKB_TX_HEADROOM;
>> +    pad_page = alloc_page(GFP_KERNEL);
>> +    if (!pad_page)
>> +        return -ENOMEM;
>> +    memset(page_address(pad_page), 0, PAGE_SIZE);
>> +    return 0;*/
> 
> Clean this up.
> 
>> +
>> +void cxgbi_release_itt(struct iscsi_task *task, itt_t hdr_itt)
>> +{
>> +    struct scsi_cmnd *sc = task->sc;
>> +    struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
>> +    struct cxgbi_conn *cconn = tcp_conn->dd_data;
>> +    struct cxgbi_device *cdev = cconn->chba->cdev;
>> +    struct cxgbi_tag_format *tformat =&cdev->tag_format;
>> +    u32 tag = ntohl((__force u32)hdr_itt);
>> +
>> +    cxgbi_tag_debug("release tag 0x%x.\n", tag);
>> +
>> +    if (sc&&
>> +        (scsi_bidi_cmnd(sc) ||
>> +         sc->sc_data_direction == DMA_FROM_DEVICE)&&
>> +            cxgbi_is_ddp_tag(tformat, tag))
> 
> The formatting is a little weird. I think you want each line to start in
> the same column instead of each getting tabbed over.
> 
> 
>> +
>> +
>> +int cxgbi_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
>> +{
>> +    struct scsi_cmnd *sc = task->sc;
>> +    struct iscsi_conn *conn = task->conn;
>> +    struct iscsi_session *sess = conn->session;
>> +    struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
>> +    struct cxgbi_conn *cconn = tcp_conn->dd_data;
>> +    struct cxgbi_device *cdev = cconn->chba->cdev;
>> +    struct cxgbi_tag_format *tformat =&cdev->tag_format;
>> +    u32 sw_tag = (sess->age<<  cconn->task_idx_bits) | task->itt;
>> +    u32 tag;
>> +    int err = -EINVAL;
>> +
>> +    if (sc&&
>> +        (scsi_bidi_cmnd(sc) ||
>> +         sc->sc_data_direction == DMA_FROM_DEVICE)&&
>> +            cxgbi_sw_tag_usable(tformat, sw_tag)) {
> 
> 
> Same tabbing.
> 
> 
>> +    volatile unsigned int state;
> 
> I did not get why this needed to be volatile (I see it is like this in
> cxgb3i and I did not see why in there too).
> 
> 
> 
>> +
>> +static inline void cxgbi_sock_hold(struct cxgbi_sock *csk)
>> +{
>> +    atomic_inc(&csk->refcnt);
> 
> 
> We want people to use krefs instead of their own refcounting now.
> 
>> +
>> +static inline void *cplhdr(struct sk_buff *skb)
>> +{
>> +    return skb->data;
>> +}
> 
> 
> Seems kinda useless.

Hi Mike,

Thanks for the review, will send you the updated patch.

Regards
Rakesh Ranjan

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