diff options
Diffstat (limited to 'drivers/scsi/libfc/fc_rport.c')
| -rw-r--r-- | drivers/scsi/libfc/fc_rport.c | 122 |
1 files changed, 117 insertions, 5 deletions
diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c index b5bc8724e1a0..c33e25851082 100644 --- a/drivers/scsi/libfc/fc_rport.c +++ b/drivers/scsi/libfc/fc_rport.c @@ -62,6 +62,7 @@ static void fc_rport_enter_prli(struct fc_rport_priv *); static void fc_rport_enter_rtv(struct fc_rport_priv *); static void fc_rport_enter_ready(struct fc_rport_priv *); static void fc_rport_enter_logo(struct fc_rport_priv *); +static void fc_rport_enter_adisc(struct fc_rport_priv *); static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_seq *, struct fc_frame *); @@ -83,6 +84,7 @@ static const char *fc_rport_state_names[] = { [RPORT_ST_RTV] = "RTV", [RPORT_ST_READY] = "Ready", [RPORT_ST_LOGO] = "LOGO", + [RPORT_ST_ADISC] = "ADISC", [RPORT_ST_DELETE] = "Delete", }; @@ -326,15 +328,25 @@ static void fc_rport_work(struct work_struct *work) * Locking Note: Called without the rport lock held. This * function will hold the rport lock, call an _enter_* * function and then unlock the rport. + * + * This indicates the intent to be logged into the remote port. + * If it appears we are already logged in, ADISC is used to verify + * the setup. */ int fc_rport_login(struct fc_rport_priv *rdata) { mutex_lock(&rdata->rp_mutex); - FC_RPORT_DBG(rdata, "Login to port\n"); - - fc_rport_enter_plogi(rdata); - + switch (rdata->rp_state) { + case RPORT_ST_READY: + FC_RPORT_DBG(rdata, "ADISC port\n"); + fc_rport_enter_adisc(rdata); + break; + default: + FC_RPORT_DBG(rdata, "Login to port\n"); + fc_rport_enter_plogi(rdata); + break; + } mutex_unlock(&rdata->rp_mutex); return 0; @@ -448,6 +460,9 @@ static void fc_rport_timeout(struct work_struct *work) case RPORT_ST_LOGO: fc_rport_enter_logo(rdata); break; + case RPORT_ST_ADISC: + fc_rport_enter_adisc(rdata); + break; case RPORT_ST_READY: case RPORT_ST_INIT: case RPORT_ST_DELETE: @@ -473,13 +488,16 @@ static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp) switch (rdata->rp_state) { case RPORT_ST_PLOGI: - case RPORT_ST_PRLI: case RPORT_ST_LOGO: fc_rport_enter_delete(rdata, RPORT_EV_FAILED); break; case RPORT_ST_RTV: fc_rport_enter_ready(rdata); break; + case RPORT_ST_PRLI: + case RPORT_ST_ADISC: + fc_rport_enter_logo(rdata); + break; case RPORT_ST_DELETE: case RPORT_ST_READY: case RPORT_ST_INIT: @@ -907,6 +925,93 @@ static void fc_rport_enter_logo(struct fc_rport_priv *rdata) } /** + * fc_rport_els_adisc_resp() - Address Discovery response handler + * @sp: current sequence in the ADISC exchange + * @fp: response frame + * @rdata_arg: remote port private. + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct fc_els_adisc *adisc; + u8 op; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a ADISC response\n"); + + if (rdata->rp_state != RPORT_ST_ADISC) { + FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n", + fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error(rdata, fp); + goto err; + } + + /* + * If address verification failed. Consider us logged out of the rport. + * Since the rport is still in discovery, we want to be + * logged in, so go to PLOGI state. Otherwise, go back to READY. + */ + op = fc_frame_payload_op(fp); + adisc = fc_frame_payload_get(fp, sizeof(*adisc)); + if (op != ELS_LS_ACC || !adisc || + ntoh24(adisc->adisc_port_id) != rdata->ids.port_id || + get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name || + get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) { + FC_RPORT_DBG(rdata, "ADISC error or mismatch\n"); + fc_rport_enter_plogi(rdata); + } else { + FC_RPORT_DBG(rdata, "ADISC OK\n"); + fc_rport_enter_ready(rdata); + } +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +/** + * fc_rport_enter_adisc() - Send Address Discover (ADISC) request to peer + * @rdata: remote port private data + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + FC_RPORT_DBG(rdata, "sending ADISC from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_ADISC); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc)); + if (!fp) { + fc_rport_error_retry(rdata, fp); + return; + } + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC, + fc_rport_adisc_resp, rdata, lport->e_d_tov)) + fc_rport_error_retry(rdata, fp); + else + kref_get(&rdata->kref); +} + +/** * fc_rport_recv_els_req() - handle a validated ELS request. * @lport: Fibre Channel local port * @sp: current sequence in the PLOGI exchange @@ -943,6 +1048,7 @@ static void fc_rport_recv_els_req(struct fc_lport *lport, case RPORT_ST_PRLI: case RPORT_ST_RTV: case RPORT_ST_READY: + case RPORT_ST_ADISC: break; default: mutex_unlock(&rdata->rp_mutex); @@ -1095,6 +1201,10 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport, break; case RPORT_ST_PRLI: case RPORT_ST_READY: + case RPORT_ST_ADISC: + FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d " + "- ignored for now\n", rdata->rp_state); + /* XXX TBD - should reset */ break; case RPORT_ST_DELETE: default: @@ -1178,6 +1288,7 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, case RPORT_ST_PRLI: case RPORT_ST_RTV: case RPORT_ST_READY: + case RPORT_ST_ADISC: reason = ELS_RJT_NONE; break; default: @@ -1283,6 +1394,7 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, fc_rport_enter_ready(rdata); break; case RPORT_ST_READY: + case RPORT_ST_ADISC: break; default: break; |