// 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);