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[SCSI] fcoe, libfc: use single frame allocation API 

Cleans up frame allocation APIs to have just single fc_frame_alloc API.

Removes _fc_frame_alloc, renames __fc_frame_alloc to _fc_frame_alloc.

Modifies fc_fcp_send_data for removed _fc_frame_alloc, fc_fcp_send_data
was the only user of removed _fc_frame_alloc.

Also Adds check in fc_frame_alloc to do mod by 4 for only non-zero
len value.

This patch is prep work to fix can_queue reducing in next patch.
Single fc_frame_alloc API helps in fixing can_queue reducing in
next patch.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Vasu Dev 2009-11-03 11:47:55 -08:00 committed by James Bottomley
parent 1875f27e29
commit a7bbc7f40a
3 changed files with 10 additions and 27 deletions
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15
drivers/scsi/libfc/fc_fcp.c
View File

@ -505,18 +505,11 @@ static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
*/
if (tlen % 4)
using_sg = 0;
if (using_sg) {
fp = _fc_frame_alloc(lport, 0);
if (!fp)
return -ENOMEM;
} else {
fp = fc_frame_alloc(lport, tlen);
if (!fp)
return -ENOMEM;
fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
if (!fp)
return -ENOMEM;
data = (void *)(fr_hdr(fp)) +
sizeof(struct fc_frame_header);
}
data = fc_frame_header_get(fp) + 1;
fh_parm_offset = frame_offset;
fr_max_payload(fp) = fsp->max_payload;
}

6
drivers/scsi/libfc/fc_frame.c
View File

@ -51,7 +51,7 @@ EXPORT_SYMBOL(fc_frame_crc_check);
* Allocate a frame intended to be sent via fcoe_xmit.
* Get an sk_buff for the frame and set the length.
*/
struct fc_frame *__fc_frame_alloc(size_t len)
struct fc_frame *_fc_frame_alloc(size_t len)
{
struct fc_frame *fp;
struct sk_buff *skb;
@ -67,7 +67,7 @@ struct fc_frame *__fc_frame_alloc(size_t len)
skb_put(skb, len);
return fp;
}
EXPORT_SYMBOL(__fc_frame_alloc);
EXPORT_SYMBOL(_fc_frame_alloc);
struct fc_frame *fc_frame_alloc_fill(struct fc_lport *lp, size_t payload_len)
{
@ -77,7 +77,7 @@ struct fc_frame *fc_frame_alloc_fill(struct fc_lport *lp, size_t payload_len)
fill = payload_len % 4;
if (fill != 0)
fill = 4 - fill;
fp = __fc_frame_alloc(payload_len + fill);
fp = _fc_frame_alloc(payload_len + fill);
if (fp) {
memset((char *) fr_hdr(fp) + payload_len, 0, fill);
/* trim is OK, we just allocated it so there are no fragments */

16
include/scsi/fc_frame.h
View File

@ -100,17 +100,7 @@ static inline void fc_frame_init(struct fc_frame *fp)
}
struct fc_frame *fc_frame_alloc_fill(struct fc_lport *, size_t payload_len);
struct fc_frame *__fc_frame_alloc(size_t payload_len);
/*
* Get frame for sending via port.
*/
static inline struct fc_frame *_fc_frame_alloc(struct fc_lport *dev,
size_t payload_len)
{
return __fc_frame_alloc(payload_len);
}
struct fc_frame *_fc_frame_alloc(size_t payload_len);
/*
* Allocate fc_frame structure and buffer. Set the initial length to
@ -124,10 +114,10 @@ static inline struct fc_frame *fc_frame_alloc(struct fc_lport *dev, size_t len)
* Note: Since len will often be a constant multiple of 4,
* this check will usually be evaluated and eliminated at compile time.
*/
if ((len % 4) != 0)
if (len && len % 4)
fp = fc_frame_alloc_fill(dev, len);
else
fp = _fc_frame_alloc(dev, len);
fp = _fc_frame_alloc(len);
return fp;
}