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[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>
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/scsi/libfc/fc_elsct.c
View File

@ -64,7 +64,7 @@ struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did,
}
fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,
FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
FC_FCTL_REQ, 0);
return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
}

6
drivers/scsi/libfc/fc_fcp.c
View File

@ -1108,7 +1108,7 @@ static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
rpriv->local_port->port_id, FC_TYPE_FCP,
FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
FC_FCTL_REQ, 0);
seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
fsp, 0);
@ -1381,7 +1381,7 @@ static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
fr_seq(fp) = fsp->seq_ptr;
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
rpriv->local_port->port_id, FC_TYPE_ELS,
FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
FC_FCTL_REQ, 0);
if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
fc_fcp_rec_resp, fsp,
jiffies_to_msecs(FC_SCSI_REC_TOV))) {
@ -1639,7 +1639,7 @@ static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
rpriv->local_port->port_id, FC_TYPE_FCP,
FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
FC_FCTL_REQ, 0);
seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL,
fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));

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);

39
drivers/scsi/libfc/fc_lport.c
View File

@ -405,11 +405,9 @@ static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp,
struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_exch *ep = fc_seq_exch(sp);
unsigned int len;
void *pp;
void *dp;
u32 f_ctl;
FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
fc_lport_state(lport));
@ -425,11 +423,8 @@ static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp,
dp = fc_frame_payload_get(fp, len);
memcpy(dp, pp, len);
*((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
sp = lport->tt.seq_start_next(sp);
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
}
fc_frame_free(in_fp);
}
@ -447,7 +442,6 @@ static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp,
struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_exch *ep = fc_seq_exch(sp);
struct fc_els_rnid *req;
struct {
struct fc_els_rnid_resp rnid;
@ -457,7 +451,6 @@ static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp,
struct fc_seq_els_data rjt_data;
u8 fmt;
size_t len;
u32 f_ctl;
FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
fc_lport_state(lport));
@ -490,12 +483,8 @@ static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp,
memcpy(&rp->gen, &lport->rnid_gen,
sizeof(rp->gen));
}
sp = lport->tt.seq_start_next(sp);
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
}
}
fc_frame_free(in_fp);
@ -800,14 +789,13 @@ static void fc_lport_recv_flogi_req(struct fc_seq *sp_in,
struct fc_lport *lport)
{
struct fc_frame *fp;
struct fc_frame_header *fh;
struct fc_seq *sp;
struct fc_exch *ep;
struct fc_els_flogi *flp;
struct fc_els_flogi *new_flp;
u64 remote_wwpn;
u32 remote_fid;
u32 local_fid;
u32 f_ctl;
FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
fc_lport_state(lport));
@ -843,7 +831,6 @@ static void fc_lport_recv_flogi_req(struct fc_seq *sp_in,
fp = fc_frame_alloc(lport, sizeof(*flp));
if (fp) {
sp = lport->tt.seq_start_next(fr_seq(rx_fp));
new_flp = fc_frame_payload_get(fp, sizeof(*flp));
fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
new_flp->fl_cmd = (u8) ELS_LS_ACC;
@ -852,11 +839,11 @@ static void fc_lport_recv_flogi_req(struct fc_seq *sp_in,
* Send the response. If this fails, the originator should
* repeat the sequence.
*/
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
ep = fc_seq_exch(sp);
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, remote_fid, local_fid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
fh = fc_frame_header_get(fp);
hton24(fh->fh_s_id, local_fid);
hton24(fh->fh_d_id, remote_fid);
lport->tt.frame_send(lport, fp);
} else {
fc_lport_error(lport, fp);
@ -1731,8 +1718,7 @@ static int fc_lport_els_request(struct fc_bsg_job *job,
hton24(fh->fh_d_id, did);
hton24(fh->fh_s_id, lport->port_id);
fh->fh_type = FC_TYPE_ELS;
hton24(fh->fh_f_ctl, FC_FC_FIRST_SEQ |
FC_FC_END_SEQ | FC_FC_SEQ_INIT);
hton24(fh->fh_f_ctl, FC_FCTL_REQ);
fh->fh_cs_ctl = 0;
fh->fh_df_ctl = 0;
fh->fh_parm_offset = 0;
@ -1791,8 +1777,7 @@ static int fc_lport_ct_request(struct fc_bsg_job *job,
hton24(fh->fh_d_id, did);
hton24(fh->fh_s_id, lport->port_id);
fh->fh_type = FC_TYPE_CT;
hton24(fh->fh_f_ctl, FC_FC_FIRST_SEQ |
FC_FC_END_SEQ | FC_FC_SEQ_INIT);
hton24(fh->fh_f_ctl, FC_FCTL_REQ);
fh->fh_cs_ctl = 0;
fh->fh_df_ctl = 0;
fh->fh_parm_offset = 0;

64
drivers/scsi/libfc/fc_rport.c
View File

@ -746,9 +746,8 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport,
struct fc_els_flogi *flp;
struct fc_rport_priv *rdata;
struct fc_frame *fp = rx_fp;
struct fc_exch *ep;
struct fc_seq_els_data rjt_data;
u32 sid, f_ctl;
u32 sid;
rjt_data.fp = NULL;
sid = fc_frame_sid(fp);
@ -813,7 +812,6 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport,
rjt_data.explan = ELS_EXPL_NONE;
goto reject;
}
fc_frame_free(rx_fp);
fp = fc_frame_alloc(lport, sizeof(*flp));
if (!fp)
@ -824,11 +822,8 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport,
flp = fc_frame_payload_get(fp, sizeof(*flp));
flp->fl_cmd = ELS_LS_ACC;
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
ep = fc_seq_exch(sp);
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
if (rdata->ids.port_name < lport->wwpn)
fc_rport_enter_plogi(rdata);
@ -837,12 +832,13 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport,
out:
mutex_unlock(&rdata->rp_mutex);
mutex_unlock(&disc->disc_mutex);
fc_frame_free(rx_fp);
return;
reject:
mutex_unlock(&disc->disc_mutex);
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
fc_frame_free(fp);
fc_frame_free(rx_fp);
}
/**
@ -1310,10 +1306,8 @@ static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
{
struct fc_lport *lport = rdata->local_port;
struct fc_frame *fp;
struct fc_exch *ep = fc_seq_exch(sp);
struct fc_els_adisc *adisc;
struct fc_seq_els_data rjt_data;
u32 f_ctl;
FC_RPORT_DBG(rdata, "Received ADISC request\n");
@ -1332,11 +1326,8 @@ static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata,
fc_adisc_fill(lport, fp);
adisc = fc_frame_payload_get(fp, sizeof(*adisc));
adisc->adisc_cmd = ELS_LS_ACC;
sp = lport->tt.seq_start_next(sp);
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
drop:
fc_frame_free(in_fp);
}
@ -1356,13 +1347,11 @@ static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
{
struct fc_lport *lport = rdata->local_port;
struct fc_frame *fp;
struct fc_exch *ep = fc_seq_exch(sp);
struct fc_els_rls *rls;
struct fc_els_rls_resp *rsp;
struct fc_els_lesb *lesb;
struct fc_seq_els_data rjt_data;
struct fc_host_statistics *hst;
u32 f_ctl;
FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n",
fc_rport_state(rdata));
@ -1399,11 +1388,8 @@ static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
lesb->lesb_inv_crc = htonl(hst->invalid_crc_count);
}
sp = lport->tt.seq_start_next(sp);
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
goto out;
out_rjt:
@ -1549,10 +1535,9 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport,
struct fc_disc *disc;
struct fc_rport_priv *rdata;
struct fc_frame *fp = rx_fp;
struct fc_exch *ep;
struct fc_els_flogi *pl;
struct fc_seq_els_data rjt_data;
u32 sid, f_ctl;
u32 sid;
rjt_data.fp = NULL;
sid = fc_frame_sid(fp);
@ -1632,27 +1617,21 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport,
* Get session payload size from incoming PLOGI.
*/
rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs);
fc_frame_free(rx_fp);
/*
* Send LS_ACC. If this fails, the originator should retry.
*/
sp = lport->tt.seq_start_next(sp);
if (!sp)
goto out;
fp = fc_frame_alloc(lport, sizeof(*pl));
if (!fp)
goto out;
fc_plogi_fill(lport, fp, ELS_LS_ACC);
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT;
ep = fc_seq_exch(sp);
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
fc_rport_enter_prli(rdata);
out:
mutex_unlock(&rdata->rp_mutex);
fc_frame_free(rx_fp);
return;
reject:
@ -1673,7 +1652,6 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
struct fc_seq *sp, struct fc_frame *rx_fp)
{
struct fc_lport *lport = rdata->local_port;
struct fc_exch *ep;
struct fc_frame *fp;
struct {
struct fc_els_prli prli;
@ -1685,7 +1663,6 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
unsigned int plen;
enum fc_els_spp_resp resp;
struct fc_seq_els_data rjt_data;
u32 f_ctl;
u32 fcp_parm;
u32 roles = FC_RPORT_ROLE_UNKNOWN;
@ -1714,8 +1691,6 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
rjt_data.explan = ELS_EXPL_INSUF_RES;
goto reject;
}
sp = lport->tt.seq_start_next(sp);
WARN_ON(!sp);
pp = fc_frame_payload_get(fp, len);
WARN_ON(!pp);
memset(pp, 0, len);
@ -1768,12 +1743,8 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
/*
* Send LS_ACC. If this fails, the originator should retry.
*/
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
ep = fc_seq_exch(sp);
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
lport->tt.seq_send(lport, sp, fp);
fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
lport->tt.frame_send(lport, fp);
switch (rdata->rp_state) {
case RPORT_ST_PRLI:
@ -1817,7 +1788,6 @@ static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
struct fc_els_spp *spp; /* response spp */
unsigned int len;
unsigned int plen;
u32 f_ctl;
struct fc_seq_els_data rjt_data;
rjt_data.fp = NULL;
@ -1859,11 +1829,9 @@ static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
fc_rport_enter_delete(rdata, RPORT_EV_LOGO);
f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
ep = fc_seq_exch(sp);
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
FC_TYPE_ELS, f_ctl, 0);
FC_TYPE_ELS, FC_FCTL_RESP, 0);
lport->tt.seq_send(lport, sp, fp);
goto drop;

7
include/scsi/fc_encode.h
View File

@ -21,6 +21,13 @@
#define _FC_ENCODE_H_
#include <asm/unaligned.h>
/*
* F_CTL values for simple requests and responses.
*/
#define FC_FCTL_REQ (FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT)
#define FC_FCTL_RESP (FC_FC_EX_CTX | FC_FC_LAST_SEQ | \
FC_FC_END_SEQ | FC_FC_SEQ_INIT)
struct fc_ns_rft {
struct fc_ns_fid fid; /* port ID object */
struct fc_ns_fts fts; /* FC4-types object */

4
include/scsi/libfc.h
View File

@ -1027,6 +1027,10 @@ struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
void *arg, u32 timer_msec);
void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
enum fc_rctl, u32 parm_offset);
void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
/*