mirror of https://gitee.com/openkylin/linux.git
250 lines
6.3 KiB
C
250 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright(c) 2007 Intel Corporation. All rights reserved.
|
|
*
|
|
* Maintained at www.Open-FCoE.org
|
|
*/
|
|
|
|
#ifndef _FC_FRAME_H_
|
|
#define _FC_FRAME_H_
|
|
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/skbuff.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
|
|
#include <scsi/fc/fc_fs.h>
|
|
#include <scsi/fc/fc_fcp.h>
|
|
#include <scsi/fc/fc_encaps.h>
|
|
|
|
#include <linux/if_ether.h>
|
|
|
|
/* some helpful macros */
|
|
|
|
#define ntohll(x) be64_to_cpu(x)
|
|
#define htonll(x) cpu_to_be64(x)
|
|
|
|
static inline u32 ntoh24(const u8 *p)
|
|
{
|
|
return (p[0] << 16) | (p[1] << 8) | p[2];
|
|
}
|
|
|
|
static inline void hton24(u8 *p, u32 v)
|
|
{
|
|
p[0] = (v >> 16) & 0xff;
|
|
p[1] = (v >> 8) & 0xff;
|
|
p[2] = v & 0xff;
|
|
}
|
|
|
|
/*
|
|
* The fc_frame interface is used to pass frame data between functions.
|
|
* The frame includes the data buffer, length, and SOF / EOF delimiter types.
|
|
* A pointer to the port structure of the receiving port is also includeded.
|
|
*/
|
|
|
|
#define FC_FRAME_HEADROOM 32 /* headroom for VLAN + FCoE headers */
|
|
#define FC_FRAME_TAILROOM 8 /* trailer space for FCoE */
|
|
|
|
/* Max number of skb frags allowed, reserving one for fcoe_crc_eof page */
|
|
#define FC_FRAME_SG_LEN (MAX_SKB_FRAGS - 1)
|
|
|
|
#define fp_skb(fp) (&((fp)->skb))
|
|
#define fr_hdr(fp) ((fp)->skb.data)
|
|
#define fr_len(fp) ((fp)->skb.len)
|
|
#define fr_cb(fp) ((struct fcoe_rcv_info *)&((fp)->skb.cb[0]))
|
|
#define fr_dev(fp) (fr_cb(fp)->fr_dev)
|
|
#define fr_seq(fp) (fr_cb(fp)->fr_seq)
|
|
#define fr_sof(fp) (fr_cb(fp)->fr_sof)
|
|
#define fr_eof(fp) (fr_cb(fp)->fr_eof)
|
|
#define fr_flags(fp) (fr_cb(fp)->fr_flags)
|
|
#define fr_encaps(fp) (fr_cb(fp)->fr_encaps)
|
|
#define fr_max_payload(fp) (fr_cb(fp)->fr_max_payload)
|
|
#define fr_fsp(fp) (fr_cb(fp)->fr_fsp)
|
|
#define fr_crc(fp) (fr_cb(fp)->fr_crc)
|
|
|
|
struct fc_frame {
|
|
struct sk_buff skb;
|
|
};
|
|
|
|
struct fcoe_rcv_info {
|
|
struct fc_lport *fr_dev; /* transport layer private pointer */
|
|
struct fc_seq *fr_seq; /* for use with exchange manager */
|
|
struct fc_fcp_pkt *fr_fsp; /* for the corresponding fcp I/O */
|
|
u32 fr_crc;
|
|
u16 fr_max_payload; /* max FC payload */
|
|
u8 fr_sof; /* start of frame delimiter */
|
|
u8 fr_eof; /* end of frame delimiter */
|
|
u8 fr_flags; /* flags - see below */
|
|
u8 fr_encaps; /* LLD encapsulation info (e.g. FIP) */
|
|
u8 granted_mac[ETH_ALEN]; /* FCoE MAC address */
|
|
};
|
|
|
|
|
|
/*
|
|
* Get fc_frame pointer for an skb that's already been imported.
|
|
*/
|
|
static inline struct fcoe_rcv_info *fcoe_dev_from_skb(const struct sk_buff *skb)
|
|
{
|
|
BUILD_BUG_ON(sizeof(struct fcoe_rcv_info) > sizeof(skb->cb));
|
|
return (struct fcoe_rcv_info *) skb->cb;
|
|
}
|
|
|
|
/*
|
|
* fr_flags.
|
|
*/
|
|
#define FCPHF_CRC_UNCHECKED 0x01 /* CRC not computed, still appended */
|
|
|
|
/*
|
|
* Initialize a frame.
|
|
* We don't do a complete memset here for performance reasons.
|
|
* The caller must set fr_free, fr_hdr, fr_len, fr_sof, and fr_eof eventually.
|
|
*/
|
|
static inline void fc_frame_init(struct fc_frame *fp)
|
|
{
|
|
fr_dev(fp) = NULL;
|
|
fr_seq(fp) = NULL;
|
|
fr_flags(fp) = 0;
|
|
fr_encaps(fp) = 0;
|
|
}
|
|
|
|
struct fc_frame *fc_frame_alloc_fill(struct fc_lport *, size_t payload_len);
|
|
struct fc_frame *_fc_frame_alloc(size_t payload_len);
|
|
|
|
/*
|
|
* Allocate fc_frame structure and buffer. Set the initial length to
|
|
* payload_size + sizeof (struct fc_frame_header).
|
|
*/
|
|
static inline struct fc_frame *fc_frame_alloc(struct fc_lport *dev, size_t len)
|
|
{
|
|
struct fc_frame *fp;
|
|
|
|
/*
|
|
* Note: Since len will often be a constant multiple of 4,
|
|
* this check will usually be evaluated and eliminated at compile time.
|
|
*/
|
|
if (len && len % 4)
|
|
fp = fc_frame_alloc_fill(dev, len);
|
|
else
|
|
fp = _fc_frame_alloc(len);
|
|
return fp;
|
|
}
|
|
|
|
/*
|
|
* Free the fc_frame structure and buffer.
|
|
*/
|
|
static inline void fc_frame_free(struct fc_frame *fp)
|
|
{
|
|
kfree_skb(fp_skb(fp));
|
|
}
|
|
|
|
static inline int fc_frame_is_linear(struct fc_frame *fp)
|
|
{
|
|
return !skb_is_nonlinear(fp_skb(fp));
|
|
}
|
|
|
|
/*
|
|
* Get frame header from message in fc_frame structure.
|
|
* This version doesn't do a length check.
|
|
*/
|
|
static inline
|
|
struct fc_frame_header *__fc_frame_header_get(const struct fc_frame *fp)
|
|
{
|
|
return (struct fc_frame_header *)fr_hdr(fp);
|
|
}
|
|
|
|
/*
|
|
* Get frame header from message in fc_frame structure.
|
|
* This hides a cast and provides a place to add some checking.
|
|
*/
|
|
static inline
|
|
struct fc_frame_header *fc_frame_header_get(const struct fc_frame *fp)
|
|
{
|
|
WARN_ON(fr_len(fp) < sizeof(struct fc_frame_header));
|
|
return __fc_frame_header_get(fp);
|
|
}
|
|
|
|
/*
|
|
* Get source FC_ID (S_ID) from frame header in message.
|
|
*/
|
|
static inline u32 fc_frame_sid(const struct fc_frame *fp)
|
|
{
|
|
return ntoh24(__fc_frame_header_get(fp)->fh_s_id);
|
|
}
|
|
|
|
/*
|
|
* Get destination FC_ID (D_ID) from frame header in message.
|
|
*/
|
|
static inline u32 fc_frame_did(const struct fc_frame *fp)
|
|
{
|
|
return ntoh24(__fc_frame_header_get(fp)->fh_d_id);
|
|
}
|
|
|
|
/*
|
|
* Get frame payload from message in fc_frame structure.
|
|
* This hides a cast and provides a place to add some checking.
|
|
* The len parameter is the minimum length for the payload portion.
|
|
* Returns NULL if the frame is too short.
|
|
*
|
|
* This assumes the interesting part of the payload is in the first part
|
|
* of the buffer for received data. This may not be appropriate to use for
|
|
* buffers being transmitted.
|
|
*/
|
|
static inline void *fc_frame_payload_get(const struct fc_frame *fp,
|
|
size_t len)
|
|
{
|
|
void *pp = NULL;
|
|
|
|
if (fr_len(fp) >= sizeof(struct fc_frame_header) + len)
|
|
pp = fc_frame_header_get(fp) + 1;
|
|
return pp;
|
|
}
|
|
|
|
/*
|
|
* Get frame payload opcode (first byte) from message in fc_frame structure.
|
|
* This hides a cast and provides a place to add some checking. Return 0
|
|
* if the frame has no payload.
|
|
*/
|
|
static inline u8 fc_frame_payload_op(const struct fc_frame *fp)
|
|
{
|
|
u8 *cp;
|
|
|
|
cp = fc_frame_payload_get(fp, sizeof(u8));
|
|
if (!cp)
|
|
return 0;
|
|
return *cp;
|
|
|
|
}
|
|
|
|
/*
|
|
* Get FC class from frame.
|
|
*/
|
|
static inline enum fc_class fc_frame_class(const struct fc_frame *fp)
|
|
{
|
|
return fc_sof_class(fr_sof(fp));
|
|
}
|
|
|
|
/*
|
|
* Check the CRC in a frame.
|
|
* The CRC immediately follows the last data item *AFTER* the length.
|
|
* The return value is zero if the CRC matches.
|
|
*/
|
|
u32 fc_frame_crc_check(struct fc_frame *);
|
|
|
|
static inline u8 fc_frame_rctl(const struct fc_frame *fp)
|
|
{
|
|
return fc_frame_header_get(fp)->fh_r_ctl;
|
|
}
|
|
|
|
static inline bool fc_frame_is_cmd(const struct fc_frame *fp)
|
|
{
|
|
return fc_frame_rctl(fp) == FC_RCTL_DD_UNSOL_CMD;
|
|
}
|
|
|
|
/*
|
|
* Check for leaks.
|
|
* Print the frame header of any currently allocated frame, assuming there
|
|
* should be none at this point.
|
|
*/
|
|
void fc_frame_leak_check(void);
|
|
|
|
#endif /* _FC_FRAME_H_ */
|