Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2007 Intel Corporation. All rights reserved.
 *
 * 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.
 * 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);