scsi: qla2xxx: edif: Add start + stop bsgs

Some FC adapters from Marvell offer the ability to encrypt data in flight
(EDIF). This feature requires an application to act as an authenticator.

Add two new BSG calls:

 - QL_VND_SC_APP_START: Application will announce its presence to driver
   with this call. Driver will restart all connections to see if remote
   device supports security or not.

 - QL_VND_SC_APP_STOP: Application announces it is in the process of
   exiting. Driver will restart all connections to revert back to
   non-secure. Provided the remote device is willing to allow a non-secure
   connection.

Link: https://lore.kernel.org/r/20210624052606.21613-2-njavali@marvell.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Co-developed-by: Larry Wisneski <Larry.Wisneski@marvell.com>
Signed-off-by: Larry Wisneski <Larry.Wisneski@marvell.com>
Co-developed-by: Duane Grigsby <duane.grigsby@marvell.com>
Signed-off-by: Duane Grigsby <duane.grigsby@marvell.com>
Co-developed-by: Rick Hicksted Jr <rhicksted@marvell.com>
Signed-off-by: Rick Hicksted Jr <rhicksted@marvell.com>
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 356 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_edif.c b/drivers/scsi/qla2xxx/qla_edif.c
new file mode 100644
index 000000000000..b0194ea1a32d
--- /dev/null
+++ b/drivers/scsi/qla2xxx/qla_edif.c
@@ -0,0 +1,356 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Marvell Fibre Channel HBA Driver
+ * Copyright (c)  2021     Marvell
+ */
+#include "qla_def.h"
+#include "qla_edif.h"
+
+#include <linux/kthread.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <scsi/scsi_tcq.h>
+
+static void
+qla_edif_sa_ctl_init(scsi_qla_host_t *vha, struct fc_port  *fcport)
+{
+	ql_dbg(ql_dbg_edif, vha, 0x2058,
+		"Init SA_CTL List for fcport - nn %8phN pn %8phN portid=%02x%02x%02x.\n",
+		fcport->node_name, fcport->port_name,
+		fcport->d_id.b.domain, fcport->d_id.b.area,
+		fcport->d_id.b.al_pa);
+
+	fcport->edif.tx_rekey_cnt = 0;
+	fcport->edif.rx_rekey_cnt = 0;
+
+	fcport->edif.tx_bytes = 0;
+	fcport->edif.rx_bytes = 0;
+}
+
+/**
+ * qla_edif_app_check(): check for valid application id.
+ * @vha: host adapter pointer
+ * @appid: application id
+ * Return: false = fail, true = pass
+ */
+static bool
+qla_edif_app_check(scsi_qla_host_t *vha, struct app_id appid)
+{
+	/* check that the app is allow/known to the driver */
+
+	if (appid.app_vid == EDIF_APP_ID) {
+		ql_dbg(ql_dbg_edif + ql_dbg_verbose, vha, 0x911d, "%s app id ok\n", __func__);
+		return true;
+	}
+	ql_dbg(ql_dbg_edif, vha, 0x911d, "%s app id not ok (%x)",
+	    __func__, appid.app_vid);
+
+	return false;
+}
+
+static void qla_edif_reset_auth_wait(struct fc_port *fcport, int state,
+		int waitonly)
+{
+	int cnt, max_cnt = 200;
+	bool traced = false;
+
+	fcport->keep_nport_handle = 1;
+
+	if (!waitonly) {
+		qla2x00_set_fcport_disc_state(fcport, state);
+		qlt_schedule_sess_for_deletion(fcport);
+	} else {
+		qla2x00_set_fcport_disc_state(fcport, state);
+	}
+
+	ql_dbg(ql_dbg_edif, fcport->vha, 0xf086,
+		"%s: waiting for session, max_cnt=%u\n",
+		__func__, max_cnt);
+
+	cnt = 0;
+
+	if (waitonly) {
+		/* Marker wait min 10 msecs. */
+		msleep(50);
+		cnt += 50;
+	}
+	while (1) {
+		if (!traced) {
+			ql_dbg(ql_dbg_edif, fcport->vha, 0xf086,
+			    "%s: session sleep.\n",
+			    __func__);
+			traced = true;
+		}
+		msleep(20);
+		cnt++;
+		if (waitonly && (fcport->disc_state == state ||
+			fcport->disc_state == DSC_LOGIN_COMPLETE))
+			break;
+		if (fcport->disc_state == DSC_LOGIN_AUTH_PEND)
+			break;
+		if (cnt > max_cnt)
+			break;
+	}
+
+	if (!waitonly) {
+		ql_dbg(ql_dbg_edif, fcport->vha, 0xf086,
+		    "%s: waited for session - %8phC, loopid=%x portid=%06x fcport=%p state=%u, cnt=%u\n",
+		    __func__, fcport->port_name, fcport->loop_id,
+		    fcport->d_id.b24, fcport, fcport->disc_state, cnt);
+	} else {
+		ql_dbg(ql_dbg_edif, fcport->vha, 0xf086,
+		    "%s: waited ONLY for session - %8phC, loopid=%x portid=%06x fcport=%p state=%u, cnt=%u\n",
+		    __func__, fcport->port_name, fcport->loop_id,
+		    fcport->d_id.b24, fcport, fcport->disc_state, cnt);
+	}
+}
+
+/**
+ * qla_edif_app_start:  application has announce its present
+ * @vha: host adapter pointer
+ * @bsg_job: user request
+ *
+ * Set/activate doorbell.  Reset current sessions and re-login with
+ * secure flag.
+ */
+static int
+qla_edif_app_start(scsi_qla_host_t *vha, struct bsg_job *bsg_job)
+{
+	int32_t			rval = 0;
+	struct fc_bsg_reply	*bsg_reply = bsg_job->reply;
+	struct app_start	appstart;
+	struct app_start_reply	appreply;
+	struct fc_port  *fcport, *tf;
+
+	ql_dbg(ql_dbg_edif, vha, 0x911d, "%s app start\n", __func__);
+
+	sg_copy_to_buffer(bsg_job->request_payload.sg_list,
+	    bsg_job->request_payload.sg_cnt, &appstart,
+	    sizeof(struct app_start));
+
+	ql_dbg(ql_dbg_edif, vha, 0x911d, "%s app_vid=%x app_start_flags %x\n",
+	     __func__, appstart.app_info.app_vid, appstart.app_start_flags);
+
+	if (vha->e_dbell.db_flags != EDB_ACTIVE) {
+		/* mark doorbell as active since an app is now present */
+		vha->e_dbell.db_flags = EDB_ACTIVE;
+	} else {
+		ql_dbg(ql_dbg_edif, vha, 0x911e, "%s doorbell already active\n",
+		     __func__);
+	}
+
+	list_for_each_entry_safe(fcport, tf, &vha->vp_fcports, list) {
+		if ((fcport->flags & FCF_FCSP_DEVICE)) {
+			ql_dbg(ql_dbg_edif, vha, 0xf084,
+			    "%s: sess %p %8phC lid %#04x s_id %06x logout %d\n",
+			    __func__, fcport, fcport->port_name,
+			    fcport->loop_id, fcport->d_id.b24,
+			    fcport->logout_on_delete);
+
+			if (atomic_read(&vha->loop_state) == LOOP_DOWN)
+				break;
+
+			if (!fcport->edif.secured_login)
+				continue;
+
+			fcport->edif.app_started = 1;
+			if (fcport->edif.app_stop ||
+			    (fcport->disc_state != DSC_LOGIN_COMPLETE &&
+			     fcport->disc_state != DSC_LOGIN_PEND &&
+			     fcport->disc_state != DSC_DELETED)) {
+				/* no activity */
+				fcport->edif.app_stop = 0;
+
+				ql_dbg(ql_dbg_edif, vha, 0x911e,
+				    "%s wwpn %8phC calling qla_edif_reset_auth_wait\n",
+				    __func__, fcport->port_name);
+				fcport->edif.app_sess_online = 1;
+				qla_edif_reset_auth_wait(fcport, DSC_LOGIN_PEND, 0);
+			}
+			qla_edif_sa_ctl_init(vha, fcport);
+		}
+	}
+
+	if (vha->pur_cinfo.enode_flags != ENODE_ACTIVE) {
+		/* mark as active since an app is now present */
+		vha->pur_cinfo.enode_flags = ENODE_ACTIVE;
+	} else {
+		ql_dbg(ql_dbg_edif, vha, 0x911f, "%s enode already active\n",
+		     __func__);
+	}
+
+	appreply.host_support_edif = vha->hw->flags.edif_enabled;
+	appreply.edif_enode_active = vha->pur_cinfo.enode_flags;
+	appreply.edif_edb_active = vha->e_dbell.db_flags;
+
+	bsg_job->reply_len = sizeof(struct fc_bsg_reply) +
+	    sizeof(struct app_start_reply);
+
+	SET_DID_STATUS(bsg_reply->result, DID_OK);
+
+	sg_copy_from_buffer(bsg_job->reply_payload.sg_list,
+	    bsg_job->reply_payload.sg_cnt, &appreply,
+	    sizeof(struct app_start_reply));
+
+	ql_dbg(ql_dbg_edif, vha, 0x911d,
+	    "%s app start completed with 0x%x\n",
+	    __func__, rval);
+
+	return rval;
+}
+
+/**
+ * qla_edif_app_stop - app has announced it's exiting.
+ * @vha: host adapter pointer
+ * @bsg_job: user space command pointer
+ *
+ * Free any in flight messages, clear all doorbell events
+ * to application. Reject any message relate to security.
+ */
+static int
+qla_edif_app_stop(scsi_qla_host_t *vha, struct bsg_job *bsg_job)
+{
+	int32_t                 rval = 0;
+	struct app_stop         appstop;
+	struct fc_bsg_reply     *bsg_reply = bsg_job->reply;
+	struct fc_port  *fcport, *tf;
+
+	sg_copy_to_buffer(bsg_job->request_payload.sg_list,
+	    bsg_job->request_payload.sg_cnt, &appstop,
+	    sizeof(struct app_stop));
+
+	ql_dbg(ql_dbg_edif, vha, 0x911d, "%s Stopping APP: app_vid=%x\n",
+	    __func__, appstop.app_info.app_vid);
+
+	/* Call db stop and enode stop functions */
+
+	/* if we leave this running short waits are operational < 16 secs */
+	qla_enode_stop(vha);        /* stop enode */
+	qla_edb_stop(vha);          /* stop db */
+
+	list_for_each_entry_safe(fcport, tf, &vha->vp_fcports, list) {
+		if (fcport->edif.non_secured_login)
+			continue;
+
+		if (fcport->flags & FCF_FCSP_DEVICE) {
+			ql_dbg(ql_dbg_edif, vha, 0xf084,
+			    "%s: sess %p from port %8phC lid %#04x s_id %06x logout %d keep %d els_logo %d\n",
+			    __func__, fcport,
+			    fcport->port_name, fcport->loop_id, fcport->d_id.b24,
+			    fcport->logout_on_delete, fcport->keep_nport_handle,
+			    fcport->send_els_logo);
+
+			if (atomic_read(&vha->loop_state) == LOOP_DOWN)
+				break;
+
+			fcport->edif.app_stop = 1;
+			ql_dbg(ql_dbg_edif, vha, 0x911e,
+				"%s wwpn %8phC calling qla_edif_reset_auth_wait\n",
+				__func__, fcport->port_name);
+
+			fcport->send_els_logo = 1;
+			qlt_schedule_sess_for_deletion(fcport);
+
+			/* qla_edif_flush_sa_ctl_lists(fcport); */
+			fcport->edif.app_started = 0;
+		}
+	}
+
+	bsg_job->reply_len = sizeof(struct fc_bsg_reply);
+	SET_DID_STATUS(bsg_reply->result, DID_OK);
+
+	/* no return interface to app - it assumes we cleaned up ok */
+
+	return rval;
+}
+
+int32_t
+qla_edif_app_mgmt(struct bsg_job *bsg_job)
+{
+	struct fc_bsg_request	*bsg_request = bsg_job->request;
+	struct fc_bsg_reply	*bsg_reply = bsg_job->reply;
+	struct Scsi_Host *host = fc_bsg_to_shost(bsg_job);
+	scsi_qla_host_t		*vha = shost_priv(host);
+	struct app_id		appcheck;
+	bool done = true;
+	int32_t         rval = 0;
+	uint32_t	vnd_sc = bsg_request->rqst_data.h_vendor.vendor_cmd[1];
+
+	ql_dbg(ql_dbg_edif, vha, 0x911d, "%s vnd subcmd=%x\n",
+	    __func__, vnd_sc);
+
+	sg_copy_to_buffer(bsg_job->request_payload.sg_list,
+	    bsg_job->request_payload.sg_cnt, &appcheck,
+	    sizeof(struct app_id));
+
+	if (!vha->hw->flags.edif_enabled ||
+		test_bit(VPORT_DELETE, &vha->dpc_flags)) {
+		ql_dbg(ql_dbg_edif, vha, 0x911d,
+		    "%s edif not enabled or vp delete. bsg ptr done %p\n",
+		    __func__, bsg_job);
+
+		SET_DID_STATUS(bsg_reply->result, DID_ERROR);
+		goto done;
+	}
+
+	if (!qla_edif_app_check(vha, appcheck)) {
+		ql_dbg(ql_dbg_edif, vha, 0x911d,
+		    "%s app checked failed.\n",
+		    __func__);
+
+		bsg_job->reply_len = sizeof(struct fc_bsg_reply);
+		SET_DID_STATUS(bsg_reply->result, DID_ERROR);
+		goto done;
+	}
+
+	switch (vnd_sc) {
+	case QL_VND_SC_APP_START:
+		rval = qla_edif_app_start(vha, bsg_job);
+		break;
+	case QL_VND_SC_APP_STOP:
+		rval = qla_edif_app_stop(vha, bsg_job);
+		break;
+	default:
+		ql_dbg(ql_dbg_edif, vha, 0x911d, "%s unknown cmd=%x\n",
+		    __func__,
+		    bsg_request->rqst_data.h_vendor.vendor_cmd[1]);
+		rval = EXT_STATUS_INVALID_PARAM;
+		bsg_job->reply_len = sizeof(struct fc_bsg_reply);
+		SET_DID_STATUS(bsg_reply->result, DID_ERROR);
+		break;
+	}
+
+done:
+	if (done) {
+		ql_dbg(ql_dbg_user, vha, 0x7009,
+		    "%s: %d  bsg ptr done %p\n", __func__, __LINE__, bsg_job);
+		bsg_job_done(bsg_job, bsg_reply->result,
+		    bsg_reply->reply_payload_rcv_len);
+	}
+
+	return rval;
+}
+
+void
+qla_enode_stop(scsi_qla_host_t *vha)
+{
+	if (vha->pur_cinfo.enode_flags != ENODE_ACTIVE) {
+		/* doorbell list not enabled */
+		ql_dbg(ql_dbg_edif, vha, 0x09102,
+		    "%s enode not active\n", __func__);
+		return;
+	}
+}
+
+/* function called when app is stopping */
+
+void
+qla_edb_stop(scsi_qla_host_t *vha)
+{
+	if (vha->e_dbell.db_flags != EDB_ACTIVE) {
+		/* doorbell list not enabled */
+		ql_dbg(ql_dbg_edif, vha, 0x09102,
+		    "%s doorbell not enabled\n", __func__);
+		return;
+	}
+}