[PATCH 27/54] fcoe, libfc: use single frame allocation API

Robert Love
2009-11-03T19:47:50Z

From: Vasu Dev <vasu.dev@intel.com>

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>
---

drivers/scsi/libfc/fc_fcp.c | 15 ++++-----------
drivers/scsi/libfc/fc_frame.c | 6 +++---
include/scsi/fc_frame.h | 16 +++-------------
3 files changed, 10 insertions(+), 27 deletions(-)

diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
index 970b54f..567eee7 100644
--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -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;
}
diff --git a/drivers/scsi/libfc/fc_frame.c b/drivers/scsi/libfc/fc_frame.c
index 4fea369..79c9565 100644
--- a/drivers/scsi/libfc/fc_frame.c
+++ b/drivers/scsi/libfc/fc_frame.c
@@ -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 */
diff --git a/include/scsi/fc_frame.h b/include/scsi/fc_frame.h
index ab2f8d4..4d3e9c7 100644
--- a/include/scsi/fc_frame.h
+++ b/include/scsi/fc_frame.h
@@ -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;
}