92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
|
|
* Copyright(c) 2007 Intel Corporation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Maintained at www.Open-FCoE.org
|
|
*/
|
|
|
|
/*
|
|
* Frame allocation.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/crc32.h>
|
|
#include <linux/gfp.h>
|
|
|
|
#include <scsi/fc_frame.h>
|
|
|
|
/*
|
|
* Check the CRC in a frame.
|
|
*/
|
|
u32 fc_frame_crc_check(struct fc_frame *fp)
|
|
{
|
|
u32 crc;
|
|
u32 error;
|
|
const u8 *bp;
|
|
unsigned int len;
|
|
|
|
WARN_ON(!fc_frame_is_linear(fp));
|
|
fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
|
|
len = (fr_len(fp) + 3) & ~3; /* round up length to include fill */
|
|
bp = (const u8 *) fr_hdr(fp);
|
|
crc = ~crc32(~0, bp, len);
|
|
error = crc ^ fr_crc(fp);
|
|
return error;
|
|
}
|
|
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 *fp;
|
|
struct sk_buff *skb;
|
|
|
|
WARN_ON((len % sizeof(u32)) != 0);
|
|
len += sizeof(struct fc_frame_header);
|
|
skb = alloc_skb_fclone(len + FC_FRAME_HEADROOM + FC_FRAME_TAILROOM +
|
|
NET_SKB_PAD, GFP_ATOMIC);
|
|
if (!skb)
|
|
return NULL;
|
|
skb_reserve(skb, NET_SKB_PAD + FC_FRAME_HEADROOM);
|
|
fp = (struct fc_frame *) skb;
|
|
fc_frame_init(fp);
|
|
skb_put(skb, len);
|
|
return fp;
|
|
}
|
|
EXPORT_SYMBOL(_fc_frame_alloc);
|
|
|
|
struct fc_frame *fc_frame_alloc_fill(struct fc_lport *lp, size_t payload_len)
|
|
{
|
|
struct fc_frame *fp;
|
|
size_t fill;
|
|
|
|
fill = payload_len % 4;
|
|
if (fill != 0)
|
|
fill = 4 - 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 */
|
|
skb_trim(fp_skb(fp),
|
|
payload_len + sizeof(struct fc_frame_header));
|
|
}
|
|
return fp;
|
|
}
|
|
EXPORT_SYMBOL(fc_frame_alloc_fill);
|