228 lines
6.2 KiB
C
228 lines
6.2 KiB
C
/*
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* Copyright(c) 2007 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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#ifndef _FC_FRAME_H_
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#define _FC_FRAME_H_
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#include <linux/scatterlist.h>
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#include <linux/skbuff.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/fc/fc_fs.h>
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#include <scsi/fc/fc_fcp.h>
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#include <scsi/fc/fc_encaps.h>
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/*
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* The fc_frame interface is used to pass frame data between functions.
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* The frame includes the data buffer, length, and SOF / EOF delimiter types.
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* A pointer to the port structure of the receiving port is also includeded.
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*/
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#define FC_FRAME_HEADROOM 32 /* headroom for VLAN + FCoE headers */
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#define FC_FRAME_TAILROOM 8 /* trailer space for FCoE */
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/*
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* Information about an individual fibre channel frame received or to be sent.
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* The buffer may be in up to 4 additional non-contiguous sections,
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* but the linear section must hold the frame header.
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*/
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#define FC_FRAME_SG_LEN 4 /* scatter/gather list maximum length */
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#define fp_skb(fp) (&((fp)->skb))
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#define fr_hdr(fp) ((fp)->skb.data)
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#define fr_len(fp) ((fp)->skb.len)
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#define fr_cb(fp) ((struct fcoe_rcv_info *)&((fp)->skb.cb[0]))
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#define fr_dev(fp) (fr_cb(fp)->fr_dev)
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#define fr_seq(fp) (fr_cb(fp)->fr_seq)
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#define fr_sof(fp) (fr_cb(fp)->fr_sof)
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#define fr_eof(fp) (fr_cb(fp)->fr_eof)
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#define fr_flags(fp) (fr_cb(fp)->fr_flags)
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#define fr_max_payload(fp) (fr_cb(fp)->fr_max_payload)
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#define fr_fsp(fp) (fr_cb(fp)->fr_fsp)
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#define fr_crc(fp) (fr_cb(fp)->fr_crc)
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struct fc_frame {
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struct sk_buff skb;
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};
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struct fcoe_rcv_info {
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struct packet_type *ptype;
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struct fc_lport *fr_dev; /* transport layer private pointer */
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struct fc_seq *fr_seq; /* for use with exchange manager */
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struct fc_fcp_pkt *fr_fsp; /* for the corresponding fcp I/O */
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u32 fr_crc;
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u16 fr_max_payload; /* max FC payload */
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enum fc_sof fr_sof; /* start of frame delimiter */
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enum fc_eof fr_eof; /* end of frame delimiter */
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u8 fr_flags; /* flags - see below */
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};
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/*
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* Get fc_frame pointer for an skb that's already been imported.
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*/
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static inline struct fcoe_rcv_info *fcoe_dev_from_skb(const struct sk_buff *skb)
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{
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BUILD_BUG_ON(sizeof(struct fcoe_rcv_info) > sizeof(skb->cb));
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return (struct fcoe_rcv_info *) skb->cb;
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}
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/*
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* fr_flags.
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*/
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#define FCPHF_CRC_UNCHECKED 0x01 /* CRC not computed, still appended */
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/*
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* Initialize a frame.
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* We don't do a complete memset here for performance reasons.
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* The caller must set fr_free, fr_hdr, fr_len, fr_sof, and fr_eof eventually.
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*/
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static inline void fc_frame_init(struct fc_frame *fp)
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{
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fr_dev(fp) = NULL;
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fr_seq(fp) = NULL;
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fr_flags(fp) = 0;
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}
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struct fc_frame *fc_frame_alloc_fill(struct fc_lport *, size_t payload_len);
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struct fc_frame *__fc_frame_alloc(size_t payload_len);
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/*
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* Get frame for sending via port.
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*/
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static inline struct fc_frame *_fc_frame_alloc(struct fc_lport *dev,
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size_t payload_len)
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{
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return __fc_frame_alloc(payload_len);
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}
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/*
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* Allocate fc_frame structure and buffer. Set the initial length to
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* payload_size + sizeof (struct fc_frame_header).
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*/
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static inline struct fc_frame *fc_frame_alloc(struct fc_lport *dev, size_t len)
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{
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struct fc_frame *fp;
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/*
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* Note: Since len will often be a constant multiple of 4,
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* this check will usually be evaluated and eliminated at compile time.
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*/
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if ((len % 4) != 0)
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fp = fc_frame_alloc_fill(dev, len);
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else
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fp = _fc_frame_alloc(dev, len);
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return fp;
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}
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/*
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* Free the fc_frame structure and buffer.
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*/
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static inline void fc_frame_free(struct fc_frame *fp)
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{
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kfree_skb(fp_skb(fp));
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}
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static inline int fc_frame_is_linear(struct fc_frame *fp)
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{
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return !skb_is_nonlinear(fp_skb(fp));
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}
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/*
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* Get frame header from message in fc_frame structure.
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* This hides a cast and provides a place to add some checking.
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*/
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static inline
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struct fc_frame_header *fc_frame_header_get(const struct fc_frame *fp)
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{
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WARN_ON(fr_len(fp) < sizeof(struct fc_frame_header));
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return (struct fc_frame_header *) fr_hdr(fp);
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}
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/*
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* Get frame payload from message in fc_frame structure.
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* This hides a cast and provides a place to add some checking.
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* The len parameter is the minimum length for the payload portion.
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* Returns NULL if the frame is too short.
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*
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* This assumes the interesting part of the payload is in the first part
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* of the buffer for received data. This may not be appropriate to use for
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* buffers being transmitted.
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*/
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static inline void *fc_frame_payload_get(const struct fc_frame *fp,
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size_t len)
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{
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void *pp = NULL;
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if (fr_len(fp) >= sizeof(struct fc_frame_header) + len)
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pp = fc_frame_header_get(fp) + 1;
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return pp;
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}
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/*
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* Get frame payload opcode (first byte) from message in fc_frame structure.
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* This hides a cast and provides a place to add some checking. Return 0
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* if the frame has no payload.
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*/
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static inline u8 fc_frame_payload_op(const struct fc_frame *fp)
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{
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u8 *cp;
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cp = fc_frame_payload_get(fp, sizeof(u8));
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if (!cp)
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return 0;
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return *cp;
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}
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/*
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* Get FC class from frame.
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*/
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static inline enum fc_class fc_frame_class(const struct fc_frame *fp)
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{
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return fc_sof_class(fr_sof(fp));
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}
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/*
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* Check the CRC in a frame.
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* The CRC immediately follows the last data item *AFTER* the length.
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* The return value is zero if the CRC matches.
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*/
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u32 fc_frame_crc_check(struct fc_frame *);
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static inline u8 fc_frame_rctl(const struct fc_frame *fp)
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{
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return fc_frame_header_get(fp)->fh_r_ctl;
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}
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static inline bool fc_frame_is_cmd(const struct fc_frame *fp)
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{
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return fc_frame_rctl(fp) == FC_RCTL_DD_UNSOL_CMD;
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}
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/*
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* Check for leaks.
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* Print the frame header of any currently allocated frame, assuming there
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* should be none at this point.
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*/
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void fc_frame_leak_check(void);
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#endif /* _FC_FRAME_H_ */
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