From: "Dupuis, Chad"
This patch adds support for ELS requests that are handled by the firmware for
offloaded sessions.
Signed-off-by: Nilesh Javali
Signed-off-by: Manish Rangankar
Signed-off-by: Saurav Kashyap
Signed-off-by: Chad Dupuis
---
drivers/scsi/qedf/qedf_els.c | 984 +++
1 file changed, 984 insertions(+)
create mode 100644 drivers/scsi/qedf/qedf_els.c
diff --git a/drivers/scsi/qedf/qedf_els.c b/drivers/scsi/qedf/qedf_els.c
new file mode 100644
index 000..98a80b3
--- /dev/null
+++ b/drivers/scsi/qedf/qedf_els.c
@@ -0,0 +1,984 @@
+/*
+ * QLogic FCoE Offload Driver
+ * Copyright (c) 2016 Cavium Inc.
+ *
+ * This software is available under the terms of the GNU General Public
License
+ * (GPL) Version 2, available from the file COPYING in the main directory of
+ * this source tree.
+ */
+#include "qedf.h"
+
+/* It's assumed that the lock is held when calling this function. */
+static int qedf_initiate_els(struct qedf_rport *fcport, unsigned int op,
+ void *data, uint32_t data_len,
+ void (*cb_func)(struct qedf_els_cb_arg *cb_arg),
+ struct qedf_els_cb_arg *cb_arg, uint32_t timer_msec)
+{
+ struct qedf_ctx *qedf = fcport->qedf;
+ struct fc_lport *lport = qedf->lport;
+ struct qedf_ioreq *els_req;
+ struct qedf_mp_req *mp_req;
+ struct fc_frame_header *fc_hdr;
+ struct fcoe_task_context *task;
+ int rc = 0;
+ uint32_t did, sid;
+ uint16_t xid;
+ uint32_t start_time = jiffies / HZ;
+ uint32_t current_time;
+
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Sending ELS\n");
+
+ rc = fc_remote_port_chkready(fcport->rport);
+ if (rc) {
+ QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: rport not ready\n", op);
+ rc = -EAGAIN;
+ goto els_err;
+ }
+ if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
+ QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: link is not ready\n",
+ op);
+ rc = -EAGAIN;
+ goto els_err;
+ }
+
+ if (!(test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags))) {
+ QEDF_ERR(&(qedf->dbg_ctx), "els 0x%x: fcport not ready\n", op);
+ rc = -EINVAL;
+ goto els_err;
+ }
+
+retry_els:
+ els_req = qedf_alloc_cmd(fcport, QEDF_ELS);
+ if (!els_req) {
+ current_time = jiffies / HZ;
+ if ((current_time - start_time) > 10) {
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS,
+ "els: Failed els 0x%x\n", op);
+ rc = -ENOMEM;
+ goto els_err;
+ }
+ mdelay(20 * USEC_PER_MSEC);
+ goto retry_els;
+ }
+
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "initiate_els els_req = "
+ "0x%p cb_arg = %p xid = %x\n", els_req, cb_arg,
+ els_req->xid);
+ els_req->sc_cmd = NULL;
+ els_req->cmd_type = QEDF_ELS;
+ els_req->fcport = fcport;
+ els_req->cb_func = cb_func;
+ cb_arg->io_req = els_req;
+ cb_arg->op = op;
+ els_req->cb_arg = cb_arg;
+ els_req->data_xfer_len = data_len;
+
+ /* Record which cpu this request is associated with */
+ els_req->cpu = smp_processor_id();
+ qedf_inc_percpu_requests(els_req->cpu);
+
+ mp_req = (struct qedf_mp_req *)&(els_req->mp_req);
+ rc = qedf_init_mp_req(els_req);
+ if (rc) {
+ QEDF_ERR(&(qedf->dbg_ctx), "ELS MP request init failed\n");
+ kref_put(&els_req->refcount, qedf_release_cmd);
+ goto els_err;
+ } else {
+ rc = 0;
+ }
+
+ /* Fill ELS Payload */
+ if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) {
+ memcpy(mp_req->req_buf, data, data_len);
+ } else {
+ QEDF_ERR(&(qedf->dbg_ctx), "Invalid ELS op 0x%x\n", op);
+ els_req->cb_func = NULL;
+ els_req->cb_arg = NULL;
+ kref_put(&els_req->refcount, qedf_release_cmd);
+ rc = -EINVAL;
+ }
+
+ if (rc)
+ goto els_err;
+
+ /* Fill FC header */
+ fc_hdr = &(mp_req->req_fc_hdr);
+
+ did = fcport->rdata->ids.port_id;
+ sid = fcport->sid;
+
+ __fc_fill_fc_hdr(fc_hdr, FC_RCTL_ELS_REQ, sid, did,
+ FC_TYPE_ELS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
+ FC_FC_SEQ_INIT, 0);
+
+ /* Obtain exchange id */
+ xid = els_req->xid;
+
+ /* Initialize task context for this IO request */
+ task = qedf_get_task_mem(&qedf->tasks, xid);
+ qedf_init_mp_task(els_req, task);
+
+ /* Put timer on original I/O request */
+ if (timer_msec)
+ qedf_cmd_timer_set(qedf, els_req, timer_msec);
+
+ qedf_add_to_sq(fcport, xid, 0, FCOE_TASK_TYPE_MIDPA