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[SCSI] libfc: Handle unsolicited PRLO request

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Resubmitting after incorporating Joe's review comment.

Unsolicited PRLO request is now handled by sending LS_ACC,
and then relogin to the remote port if an N-port login
session exists for that remote port.

Note that this patch should be applied on top of Joe Eykholt's
"Fix remote port restart problem" patch.

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.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:
Bhanu Prakash Gollapudi 2010-06-11 16:44:04 -07:00 committed by James Bottomley
parent 5d4a2e29fb
commit f8fc6c2c99
2 changed files with 72 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
drivers/scsi/libfc/fc_rport.c
View File

@ -1573,30 +1573,85 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
* fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests
* @rdata: The remote port that sent the PRLO request
* @sp: The sequence that the PRLO was on
* @fp: The PRLO request frame
* @rx_fp: The PRLO request frame
*
* Locking Note: The rport lock is exected to be held before calling
* this function.
*/
static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata,
struct fc_seq *sp,
struct fc_frame *fp)
struct fc_frame *rx_fp)
{
struct fc_lport *lport = rdata->local_port;
struct fc_frame_header *fh;
struct fc_exch *ep;
struct fc_frame *fp;
struct {
struct fc_els_prlo prlo;
struct fc_els_spp spp;
} *pp;
struct fc_els_spp *rspp; /* request service param page */
struct fc_els_spp *spp; /* response spp */
unsigned int len;
unsigned int plen;
u32 f_ctl;
struct fc_seq_els_data rjt_data;
fh = fc_frame_header_get(fp);
rjt_data.fp = NULL;
fh = fc_frame_header_get(rx_fp);
FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n",
fc_rport_state(rdata));
rjt_data.fp = NULL;
rjt_data.reason = ELS_RJT_UNAB;
rjt_data.explan = ELS_EXPL_NONE;
len = fr_len(rx_fp) - sizeof(*fh);
pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
if (!pp)
goto reject_len;
plen = ntohs(pp->prlo.prlo_len);
if (plen != 20)
goto reject_len;
if (plen < len)
len = plen;
rspp = &pp->spp;
fp = fc_frame_alloc(lport, len);
if (!fp) {
rjt_data.reason = ELS_RJT_UNAB;
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);
pp->prlo.prlo_cmd = ELS_LS_ACC;
pp->prlo.prlo_obs = 0x10;
pp->prlo.prlo_len = htons(len);
spp = &pp->spp;
spp->spp_type = rspp->spp_type;
spp->spp_type_ext = rspp->spp_type_ext;
spp->spp_flags = FC_SPP_RESP_ACK;
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);
lport->tt.seq_send(lport, sp, fp);
goto drop;
reject_len:
rjt_data.reason = ELS_RJT_PROT;
rjt_data.explan = ELS_EXPL_INV_LEN;
reject:
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
fc_frame_free(fp);
drop:
fc_frame_free(rx_fp);
}
/**

9
include/scsi/fc/fc_els.h
View File

@ -404,6 +404,15 @@ struct fc_els_prli {
/* service parameter pages follow */
};
/*
* ELS_PRLO - Process logout request and response.
*/
struct fc_els_prlo {
__u8 prlo_cmd; /* command */
__u8 prlo_obs; /* obsolete, but shall be set to 10h */
__be16 prlo_len; /* payload length */
};
/*
* ELS_ADISC payload
*/