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authorJoe Eykholt <jeykholt@cisco.com>2010-07-20 15:21:01 -0700
committerJames Bottomley <James.Bottomley@suse.de>2010-07-28 09:06:00 -0500
commit24f089e2f2c800f88039e9d536d558ec6e349fad (patch)
tree59cf263f112e176015a3a37c3928cc3d2a4dfcb5 /drivers/scsi/libfc/fc_libfc.c
parent251748a99e631a2c46edcf9e519cfc60fae8153d (diff)
downloadlinux-24f089e2f2c800f88039e9d536d558ec6e349fad.tar.bz2
[SCSI] libfc: add fc_fill_reply_hdr() and fc_fill_hdr()
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>
Diffstat (limited to 'drivers/scsi/libfc/fc_libfc.c')
-rw-r--r--drivers/scsi/libfc/fc_libfc.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/scsi/libfc/fc_libfc.c b/drivers/scsi/libfc/fc_libfc.c
index 39f4b6ab04b4..6a48c28e4420 100644
--- a/drivers/scsi/libfc/fc_libfc.c
+++ b/drivers/scsi/libfc/fc_libfc.c
@@ -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);