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[SCSI] libfc: add support of receiving ELS_RLS 

Upon receiving ELS_RLS, send the Link Error Status Block (LESB) back.

Signed-off-by: Yi Zou <yi.zou@intel.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:
Yi Zou 2009-11-20 14:55:24 -08:00 committed by James Bottomley
parent b84056bf68
commit 63e27fb80c
1 changed files with 76 additions and 0 deletions
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76
drivers/scsi/libfc/fc_rport.c
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@ -1097,6 +1097,78 @@ drop:
fc_frame_free(in_fp);
}
/**
* fc_rport_recv_rls_req() - Handle received Read Link Status request
* @rdata: The remote port that sent the RLS request
* @sp: The sequence that the RLS was on
* @rx_fp: The PRLI request frame
*
* Locking Note: The rport lock is expected to be held before calling
* this function.
*/
static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata,
struct fc_seq *sp, struct fc_frame *rx_fp)
{
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));
rls = fc_frame_payload_get(rx_fp, sizeof(*rls));
if (!rls) {
rjt_data.reason = ELS_RJT_PROT;
rjt_data.explan = ELS_EXPL_INV_LEN;
goto out_rjt;
}
fp = fc_frame_alloc(lport, sizeof(*rsp));
if (!fp) {
rjt_data.reason = ELS_RJT_UNAB;
rjt_data.explan = ELS_EXPL_INSUF_RES;
goto out_rjt;
}
rsp = fc_frame_payload_get(fp, sizeof(*rsp));
memset(rsp, 0, sizeof(*rsp));
rsp->rls_cmd = ELS_LS_ACC;
lesb = &rsp->rls_lesb;
if (lport->tt.get_lesb) {
/* get LESB from LLD if it supports it */
lport->tt.get_lesb(lport, lesb);
} else {
fc_get_host_stats(lport->host);
hst = &lport->host_stats;
lesb->lesb_link_fail = htonl(hst->link_failure_count);
lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count);
lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count);
lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count);
lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count);
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);
goto out;
out_rjt:
rjt_data.fp = NULL;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
out:
fc_frame_free(rx_fp);
}
/**
* fc_rport_recv_els_req() - Handler for validated ELS requests
* @lport: The local port that received the ELS request
@ -1159,6 +1231,9 @@ static void fc_rport_recv_els_req(struct fc_lport *lport,
els_data.fp = fp;
lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data);
break;
case ELS_RLS:
fc_rport_recv_rls_req(rdata, sp, fp);
break;
default:
fc_frame_free(fp); /* can't happen */
break;
@ -1203,6 +1278,7 @@ void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
case ELS_ADISC:
case ELS_RRQ:
case ELS_REC:
case ELS_RLS:
fc_rport_recv_els_req(lport, sp, fp);
break;
default: