qla_rscn.c

linux-2.6.15.6

					 * to login to a remote port with just
					 * a loop id without knowing about the
					 * port id.  Copy the port id and try
					 * again.
					 */
					remote_fcport->d_id.b24 = inuse_did.b24;
					iodesc->d_id.b24 = inuse_did.b24;
				} else {
					remote_fcport->loop_id++;
					rval = qla2x00_find_new_loop_id(ha,
					    remote_fcport);
					if (rval == QLA_FUNCTION_FAILED) {
						/* No more loop ids. */
						return (QLA_SUCCESS);
					}
				}
			} else if (mb[0] == MBS_PORT_ID_USED) {
				/*
				 * Device has another loop ID.  The firmware
				 * group recommends the driver perform an
				 * implicit login with the specified ID.
				 */
				DEBUG14(printk("scsi(%ld): Login IOCB -- port "
				    "id [%02x%02x%02x] already assigned to "
				    "loop id [%x].\n", ha->host_no,
				    iodesc->d_id.b.domain, iodesc->d_id.b.area,
				    iodesc->d_id.b.al_pa, mb[1]));

				remote_fcport->loop_id = mb[1];

			} else {
				/* Unable to perform login, try again. */
				DEBUG14(printk("scsi(%ld): Login IOCB -- "
				    "failed login [%x/%02x%02x%02x], status=%x "
				    "mb0=%x mb1=%x mb2=%x mb6=%x mb7=%x.\n",
				    ha->host_no, remote_fcport->loop_id,
				    iodesc->d_id.b.domain, iodesc->d_id.b.area,
				    iodesc->d_id.b.al_pa, status, mb[0], mb[1],
				    mb[2], mb[6], mb[7]));
			}

			/* Reissue Login with the same IO descriptor. */
			iodesc->signature =
			    qla2x00_iodesc_to_handle(iodesc);
			iodesc->cb_idx = LOGIN_PORT_IOCB_CB;
			iodesc->d_id.b24 = remote_fcport->d_id.b24;
			remote_fcport->iodesc_idx_sent = iodesc->idx;
			remote_fcport->login_retry--;

			DEBUG14(printk("scsi(%ld): Login IOCB -- retrying "
			    "login to [%x/%02x%02x%02x] (%d).\n", ha->host_no,
			    remote_fcport->loop_id,
			    remote_fcport->d_id.b.domain,
			    remote_fcport->d_id.b.area,
			    remote_fcport->d_id.b.al_pa,
			    remote_fcport->login_retry));

			qla2x00_send_login_iocb(ha, iodesc,
			    &remote_fcport->d_id, 1);

			return (QLA_FUNCTION_FAILED);
		} else {
			/* No more logins, mark device dead. */
			DEBUG14(printk("scsi(%ld): Login IOCB -- failed "
			    "login [%x/%02x%02x%02x] after retries, status=%x "
			    "mb0=%x mb1=%x mb2=%x mb6=%x mb7=%x.\n",
			    ha->host_no, remote_fcport->loop_id,
			    iodesc->d_id.b.domain, iodesc->d_id.b.area,
			    iodesc->d_id.b.al_pa, status, mb[0], mb[1],
			    mb[2], mb[6], mb[7]));

			atomic_set(&remote_fcport->state, FCS_DEVICE_DEAD);
			if (remote_fcport->port_type == FCT_RSCN) {
				DEBUG14(printk("scsi(%ld): Login IOCB -- "
				    "Freeing dead RSCN fcport %p "
				    "[%x/%02x%02x%02x].\n", ha->host_no,
				    remote_fcport, remote_fcport->loop_id,
				    remote_fcport->d_id.b.domain,
				    remote_fcport->d_id.b.area,
				    remote_fcport->d_id.b.al_pa));

				list_del(&remote_fcport->list);
				kfree(remote_fcport);
			}
		}
	}

	return (QLA_SUCCESS);
}


/**
 * IO descriptor processing routines.
 **/

/**
 * qla2x00_alloc_rscn_fcport() - Allocate an RSCN type fcport.
 * @ha: HA context
 * @flags: allocation flags
 *
 * Returns a pointer to the allocated RSCN fcport, or NULL, if none available.
 */
fc_port_t *
qla2x00_alloc_rscn_fcport(scsi_qla_host_t *ha, gfp_t flags)
{
	fc_port_t *fcport;

	fcport = qla2x00_alloc_fcport(ha, flags);
	if (fcport == NULL)
		return (fcport);

	/* Setup RSCN fcport structure. */
	fcport->port_type = FCT_RSCN;

	return (fcport);
}

/**
 * qla2x00_handle_port_rscn() - Handle port RSCN.
 * @ha: HA context
 * @rscn_entry: RSCN entry
 * @fcport: fcport entry to updated
 *
 * Returns QLA_SUCCESS if the port RSCN was handled.
 */
int
qla2x00_handle_port_rscn(scsi_qla_host_t *ha, uint32_t rscn_entry,
    fc_port_t *known_fcport, int ha_locked)
{
	int	rval;
	port_id_t rscn_pid;
	fc_port_t *fcport, *remote_fcport, *rscn_fcport;
	struct io_descriptor *iodesc;

	remote_fcport = NULL;
	rscn_fcport = NULL;

	/* Prepare port id based on incoming entries. */
	if (known_fcport) {
		rscn_pid.b24 = known_fcport->d_id.b24;
		remote_fcport = known_fcport;

		DEBUG14(printk("scsi(%ld): Handle RSCN -- process RSCN for "
		    "fcport [%02x%02x%02x].\n", ha->host_no,
		    remote_fcport->d_id.b.domain, remote_fcport->d_id.b.area,
		    remote_fcport->d_id.b.al_pa));
	} else {
		rscn_pid.b.domain = LSB(MSW(rscn_entry));
		rscn_pid.b.area = MSB(LSW(rscn_entry));
		rscn_pid.b.al_pa = LSB(LSW(rscn_entry));

		DEBUG14(printk("scsi(%ld): Handle RSCN -- process RSCN for "
		    "port id [%02x%02x%02x].\n", ha->host_no,
		    rscn_pid.b.domain, rscn_pid.b.area, rscn_pid.b.al_pa));

		/*
		 * Search fcport lists for a known entry at the specified port
		 * ID.
		 */
		list_for_each_entry(fcport, &ha->fcports, list) {
		    if (rscn_pid.b24 == fcport->d_id.b24) {
			    remote_fcport = fcport;
			    break;
		    }
		}
		list_for_each_entry(fcport, &ha->rscn_fcports, list) {
		    if (rscn_pid.b24 == fcport->d_id.b24) {
			    rscn_fcport = fcport;
			    break;
		    }
		}
		if (remote_fcport == NULL)
		    remote_fcport = rscn_fcport;
	}

	/*
	 * If the port is already in our fcport list and online, send an ADISC
	 * to see if it's still alive.  Issue login if a new fcport or the known
	 * fcport is currently offline.
	 */
	if (remote_fcport) {
		/*
		 * No need to send request if the remote fcport is currently
		 * waiting for an available io descriptor.
		 */
		if (known_fcport == NULL &&
		    (remote_fcport->iodesc_idx_sent == IODESC_ADISC_NEEDED ||
		    remote_fcport->iodesc_idx_sent == IODESC_LOGIN_NEEDED)) {
			/*
			 * If previous waiting io descriptor is an ADISC, then
			 * the new RSCN may come from a new remote fcport being
			 * plugged into the same location.
			 */
			if (remote_fcport->port_type == FCT_RSCN) {
			    remote_fcport->iodesc_idx_sent =
				IODESC_LOGIN_NEEDED;
			} else if (remote_fcport->iodesc_idx_sent ==
			    IODESC_ADISC_NEEDED) {
				fc_port_t *new_fcport;

				remote_fcport->iodesc_idx_sent =
				    IODESC_INVALID_INDEX;

				/* Create new fcport for later login. */
				new_fcport = qla2x00_alloc_rscn_fcport(ha,
				    ha_locked ? GFP_ATOMIC: GFP_KERNEL);
				if (new_fcport) {
					DEBUG14(printk("scsi(%ld): Handle RSCN "
					    "-- creating RSCN fcport %p for "
					    "future login.\n", ha->host_no,
					    new_fcport));

					new_fcport->d_id.b24 =
					    remote_fcport->d_id.b24;
					new_fcport->iodesc_idx_sent =
					    IODESC_LOGIN_NEEDED;

					list_add_tail(&new_fcport->list,
					    &ha->rscn_fcports);
					set_bit(IODESC_PROCESS_NEEDED,
					    &ha->dpc_flags);
				} else {
					DEBUG14(printk("scsi(%ld): Handle RSCN "
					    "-- unable to allocate RSCN fcport "
					    "for future login.\n",
					    ha->host_no));
				}
			}
			return (QLA_SUCCESS);
		}

		/* Send ADISC if the fcport is online */
		if (atomic_read(&remote_fcport->state) == FCS_ONLINE ||
		    remote_fcport->iodesc_idx_sent == IODESC_ADISC_NEEDED) {

			atomic_set(&remote_fcport->state, FCS_DEVICE_LOST);

			iodesc = qla2x00_alloc_iodesc(ha);
			if (iodesc == NULL) {
				/* Mark fcport for later adisc processing */
				DEBUG14(printk("scsi(%ld): Handle RSCN -- not "
				    "enough IO descriptors for Adisc, flag "
				    "for later processing.\n", ha->host_no));

				remote_fcport->iodesc_idx_sent =
				    IODESC_ADISC_NEEDED;
				set_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags);

				return (QLA_SUCCESS);
			}

			iodesc->cb_idx = ADISC_PORT_IOCB_CB;
			iodesc->d_id.b24 = rscn_pid.b24;
			iodesc->remote_fcport = remote_fcport;
			remote_fcport->iodesc_idx_sent = iodesc->idx;
			qla2x00_send_adisc_iocb(ha, iodesc, ha_locked);

			return (QLA_SUCCESS);
		} else if (remote_fcport->iodesc_idx_sent <
		    MAX_IO_DESCRIPTORS &&
		    ha->io_descriptors[remote_fcport->iodesc_idx_sent].cb_idx ==
		    ADISC_PORT_IOCB_CB) {
			/*
			 * Receiving another RSCN while an ADISC is pending,
			 * abort the IOCB.  Use the same descriptor for the
			 * abort.
			 */
			uint32_t handle_to_abort;

			iodesc = &ha->io_descriptors[
				remote_fcport->iodesc_idx_sent];
			qla2x00_remove_iodesc_timer(iodesc);
			handle_to_abort = iodesc->signature;
			iodesc->signature = qla2x00_iodesc_to_handle(iodesc);
			iodesc->cb_idx = ABORT_IOCB_CB;
			iodesc->d_id.b24 = remote_fcport->d_id.b24;
			iodesc->remote_fcport = remote_fcport;
			remote_fcport->iodesc_idx_sent = iodesc->idx;

			DEBUG14(printk("scsi(%ld): Handle RSCN -- issuing "
			    "abort to outstanding Adisc [%x/%02x%02x%02x].\n",
			    ha->host_no, remote_fcport->loop_id,
			    iodesc->d_id.b.domain, iodesc->d_id.b.area,
			    iodesc->d_id.b.al_pa));

			qla2x00_send_abort_iocb(ha, iodesc, handle_to_abort,
			    ha_locked);
		}
	}

	/* We need to login to the remote port, find it. */
	if (known_fcport) {
		remote_fcport = known_fcport;
	} else if (rscn_fcport && rscn_fcport->d_id.b24 != INVALID_PORT_ID &&
	    rscn_fcport->iodesc_idx_sent < MAX_IO_DESCRIPTORS &&
	    ha->io_descriptors[rscn_fcport->iodesc_idx_sent].cb_idx ==
	    LOGIN_PORT_IOCB_CB) {
		/*
		 * Ignore duplicate RSCN on fcport which has already
		 * initiated a login IOCB.
		 */
		DEBUG14(printk("scsi(%ld): Handle RSCN -- ignoring, login "
		    "already sent to [%02x%02x%02x].\n", ha->host_no,
		    rscn_fcport->d_id.b.domain, rscn_fcport->d_id.b.area,
		    rscn_fcport->d_id.b.al_pa));

		return (QLA_SUCCESS);
	} else if (rscn_fcport && rscn_fcport->d_id.b24 != INVALID_PORT_ID &&
	    rscn_fcport != remote_fcport) {
		/* Reuse same rscn fcport. */
		DEBUG14(printk("scsi(%ld): Handle RSCN -- reusing RSCN fcport "
		    "[%02x%02x%02x].\n", ha->host_no,
		    rscn_fcport->d_id.b.domain, rscn_fcport->d_id.b.area,
		    rscn_fcport->d_id.b.al_pa));

		remote_fcport = rscn_fcport;
	} else {
		/* Create new fcport for later login. */
		remote_fcport = qla2x00_alloc_rscn_fcport(ha,
		    ha_locked ? GFP_ATOMIC: GFP_KERNEL);
		list_add_tail(&remote_fcport->list, &ha->rscn_fcports);
	}
	if (remote_fcport == NULL)
		return (QLA_SUCCESS);

	/* Prepare fcport for login. */
	atomic_set(&remote_fcport->state, FCS_DEVICE_LOST);
	remote_fcport->login_retry = 3; /* ha->login_retry_count; */
	remote_fcport->d_id.b24 = rscn_pid.b24;

	iodesc = qla2x00_alloc_iodesc(ha);
	if (iodesc == NULL) {
		/* Mark fcport for later adisc processing. */
		DEBUG14(printk("scsi(%ld): Handle RSCN -- not enough IO "
		    "descriptors for Login, flag for later processing.\n",
		    ha->host_no));

		remote_fcport->iodesc_idx_sent = IODESC_LOGIN_NEEDED;
		set_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags);

		return (QLA_SUCCESS);
	}

	if (known_fcport == NULL || rscn_pid.b24 != INVALID_PORT_ID) {
		remote_fcport->loop_id = ha->min_external_loopid;

		rval = qla2x00_find_new_loop_id(ha, remote_fcport);
		if (rval == QLA_FUNCTION_FAILED) {
			/* No more loop ids, failed. */
			DEBUG14(printk("scsi(%ld): Handle RSCN -- no available "
			    "loop id to perform Login, failed.\n",
			    ha->host_no));

			return (rval);
		}
	}

	iodesc->cb_idx = LOGIN_PORT_IOCB_CB;
	iodesc->d_id.b24 = rscn_pid.b24;
	iodesc->remote_fcport = remote_fcport;
	remote_fcport->iodesc_idx_sent = iodesc->idx;

	DEBUG14(printk("scsi(%ld): Handle RSCN -- attempting login to "
	    "[%x/%02x%02x%02x].\n", ha->host_no, remote_fcport->loop_id,
	    iodesc->d_id.b.domain, iodesc->d_id.b.area, iodesc->d_id.b.al_pa));

	qla2x00_send_login_iocb(ha, iodesc, &rscn_pid, ha_locked);

	return (QLA_SUCCESS);
}

/**
 * qla2x00_process_iodesc() - Complete IO descriptor processing.
 * @ha: HA context
 * @mbxstat: Mailbox IOCB status
 */
void
qla2x00_process_iodesc(scsi_qla_host_t *ha, struct mbx_entry *mbxstat)
{
	int rval;
	uint32_t signature;
	fc_port_t *fcport;
	struct io_descriptor *iodesc;

	signature = mbxstat->handle;

	DEBUG14(printk("scsi(%ld): Process IODesc -- processing %08x.\n",
	    ha->host_no, signature));

	/* Retrieve proper IO descriptor. */
	iodesc = qla2x00_handle_to_iodesc(ha, signature);
	if (iodesc == NULL) {
		DEBUG14(printk("scsi(%ld): Process IODesc -- ignoring, "
		    "incorrect signature %08x.\n", ha->host_no, signature));

		return;
	}

	/* Stop IO descriptor timer. */
	qla2x00_remove_iodesc_timer(iodesc);

	/* Verify signature match. */
	if (iodesc->signature != signature) {
		DEBUG14(printk("scsi(%ld): Process IODesc -- ignoring, "
		    "signature mismatch, sent %08x, received %08x.\n",
		    ha->host_no, iodesc->signature, signature));

		return;
	}

	/* Go with IOCB callback. */
	rval = iocb_function_cb_list[iodesc->cb_idx](ha, iodesc, mbxstat);
	if (rval != QLA_SUCCESS) {
		/* IO descriptor reused by callback. */
		return;
	}

	qla2x00_free_iodesc(iodesc);

	if (test_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags)) {
		/* Scan our fcports list for any RSCN requests. */
		list_for_each_entry(fcport, &ha->fcports, list) {
			if (fcport->iodesc_idx_sent == IODESC_ADISC_NEEDED ||
			    fcport->iodesc_idx_sent == IODESC_LOGIN_NEEDED) {
				qla2x00_handle_port_rscn(ha, 0, fcport, 1);
				return;
			}
		}

		/* Scan our RSCN fcports list for any RSCN requests. */
		list_for_each_entry(fcport, &ha->rscn_fcports, list) {
			if (fcport->iodesc_idx_sent == IODESC_ADISC_NEEDED ||
			    fcport->iodesc_idx_sent == IODESC_LOGIN_NEEDED) {
				qla2x00_handle_port_rscn(ha, 0, fcport, 1);
				return;
			}
		}
	}
	clear_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags);
}

/**
 * qla2x00_cancel_io_descriptors() - Cancel all outstanding io descriptors.
 * @ha: HA context
 *
 * This routine will also delete any RSCN entries related to the outstanding
 * IO descriptors.
 */
void
qla2x00_cancel_io_descriptors(scsi_qla_host_t *ha)
{
	fc_port_t *fcport, *fcptemp;

	clear_bit(IODESC_PROCESS_NEEDED, &ha->dpc_flags);

	/* Abort all IO descriptors. */
	qla2x00_init_io_descriptors(ha);

	/* Reset all pending IO descriptors in fcports list. */
	list_for_each_entry(fcport, &ha->fcports, list) {
		fcport->iodesc_idx_sent = IODESC_INVALID_INDEX;
	}

	/* Reset all pending IO descriptors in rscn fcports list. */
	list_for_each_entry_safe(fcport, fcptemp, &ha->rscn_fcports, list) {
		DEBUG14(printk("scsi(%ld): Cancel IOs -- Freeing RSCN fcport "
		    "%p [%x/%02x%02x%02x].\n", ha->host_no, fcport,
		    fcport->loop_id, fcport->d_id.b.domain, fcport->d_id.b.area,
		    fcport->d_id.b.al_pa));

		list_del(&fcport->list);
		kfree(fcport);
	}
}