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[SCSI] libfc: add fc_fill_reply_hdr() and fc_fill_hdr()

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Add functions to fill in an FC header given a request header.
These reduces code lines in fc_lport and fc_rport and works
without an exchange/sequence assigned.

fc_fill_reply_hdr() fills a header for a final reply frame.

fc_fill_hdr() which is similar but allows specifying the
f_ctl parameter.

Add defines for F_CTL values FC_FCTL_REQ and FC_FCTL_RESP.
These can be used for most request and response sequences.

v2 of patch adds a line to copy the frame encapsulation
info from the received frame.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Joe Eykholt
2010-07-20 15:21:01 -07:00
committed by James Bottomley
parent 251748a99e
commit 24f089e2f2
7 changed files with 121 additions and 79 deletions
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78
drivers/scsi/libfc/fc_libfc.c
View File

@@ -23,6 +23,7 @@
#include <linux/crc32.h>
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
#include "fc_libfc.h"
@@ -132,3 +133,80 @@ u32 fc_copy_buffer_to_sglist(void *buf, size_t len,
}
return copy_len;
}
/**
* fc_fill_hdr() - fill FC header fields based on request
* @fp: reply frame containing header to be filled in
* @in_fp: request frame containing header to use in filling in reply
* @r_ctl: R_CTL value for header
* @f_ctl: F_CTL value for header, with 0 pad
* @seq_cnt: sequence count for the header, ignored if frame has a sequence
* @parm_offset: parameter / offset value
*/
void fc_fill_hdr(struct fc_frame *fp, const struct fc_frame *in_fp,
enum fc_rctl r_ctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset)
{
struct fc_frame_header *fh;
struct fc_frame_header *in_fh;
struct fc_seq *sp;
u32 fill;
fh = __fc_frame_header_get(fp);
in_fh = __fc_frame_header_get(in_fp);
if (f_ctl & FC_FC_END_SEQ) {
fill = -fr_len(fp) & 3;
if (fill) {
/* TODO, this may be a problem with fragmented skb */
memset(skb_put(fp_skb(fp), fill), 0, fill);
f_ctl |= fill;
}
fr_eof(fp) = FC_EOF_T;
} else {
WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */
fr_eof(fp) = FC_EOF_N;
}
fh->fh_r_ctl = r_ctl;
memcpy(fh->fh_d_id, in_fh->fh_s_id, sizeof(fh->fh_d_id));
memcpy(fh->fh_s_id, in_fh->fh_d_id, sizeof(fh->fh_s_id));
fh->fh_type = in_fh->fh_type;
hton24(fh->fh_f_ctl, f_ctl);
fh->fh_ox_id = in_fh->fh_ox_id;
fh->fh_rx_id = in_fh->fh_rx_id;
fh->fh_cs_ctl = 0;
fh->fh_df_ctl = 0;
fh->fh_parm_offset = htonl(parm_offset);
sp = fr_seq(in_fp);
if (sp) {
fr_seq(fp) = sp;
fh->fh_seq_id = sp->id;
seq_cnt = sp->cnt;
} else {
fh->fh_seq_id = 0;
}
fh->fh_seq_cnt = ntohs(seq_cnt);
fr_sof(fp) = seq_cnt ? FC_SOF_N3 : FC_SOF_I3;
fr_encaps(fp) = fr_encaps(in_fp);
}
EXPORT_SYMBOL(fc_fill_hdr);
/**
* fc_fill_reply_hdr() - fill FC reply header fields based on request
* @fp: reply frame containing header to be filled in
* @in_fp: request frame containing header to use in filling in reply
* @r_ctl: R_CTL value for reply
* @parm_offset: parameter / offset value
*/
void fc_fill_reply_hdr(struct fc_frame *fp, const struct fc_frame *in_fp,
enum fc_rctl r_ctl, u32 parm_offset)
{
struct fc_seq *sp;
sp = fr_seq(in_fp);
if (sp)
fr_seq(fp) = fr_dev(in_fp)->tt.seq_start_next(sp);
fc_fill_hdr(fp, in_fp, r_ctl, FC_FCTL_RESP, 0, parm_offset);
}
EXPORT_SYMBOL(fc_fill_reply_hdr);