[PATCH v3 23/31] elx: efct: SCSI IO handling routines

James Smart
2020-04-12T03:33:54Z

This patch continues the efct driver population.

This patch adds driver definitions for:
Routines for SCSI transport IO alloc, build and send IO.

Signed-off-by: Ram Vegesna <ram.vegesna@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>

---
v3:
Removed DIF related code which is not used.
Removed SCSI get property.
---
drivers/scsi/elx/efct/efct_scsi.c | 1192 +++++++++++++++++++++++++++++++++++++
drivers/scsi/elx/efct/efct_scsi.h | 235 ++++++++
2 files changed, 1427 insertions(+)
create mode 100644 drivers/scsi/elx/efct/efct_scsi.c
create mode 100644 drivers/scsi/elx/efct/efct_scsi.h

diff --git a/drivers/scsi/elx/efct/efct_scsi.c b/drivers/scsi/elx/efct/efct_scsi.c
new file mode 100644
index 000000000000..c299eadbc492
--- /dev/null
+++ b/drivers/scsi/elx/efct/efct_scsi.c
@@ -0,0 +1,1192 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Broadcom. All Rights Reserved. The term
+ * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
+ */
+
+#include "efct_driver.h"
+#include "efct_els.h"
+#include "efct_hw.h"
+
+#define enable_tsend_auto_resp(efct) 1
+#define enable_treceive_auto_resp(efct) 0
+
+#define SCSI_IOFMT "[%04x][i:%04x t:%04x h:%04x]"
+
+#define scsi_io_printf(io, fmt, ...) \
+ efc_log_debug(io->efct, "[%s]" SCSI_IOFMT fmt, \
+ io->node->display_name, io->instance_index,\
+ io->init_task_tag, io->tgt_task_tag, io->hw_tag, ##__VA_ARGS__)
+
+#define EFCT_LOG_ENABLE_SCSI_TRACE(efct) \
+ (((efct) != NULL) ? (((efct)->logmask & (1U << 2)) != 0) : 0)
+
+#define scsi_io_trace(io, fmt, ...) \
+ do { \
+ if (EFCT_LOG_ENABLE_SCSI_TRACE(io->efct)) \
+ scsi_io_printf(io, fmt, ##__VA_ARGS__); \
+ } while (0)
+
+/* Enable the SCSI and Transport IO allocations */
+void
+efct_scsi_io_alloc_enable(struct efc *efc, struct efc_node *node)
+{
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&node->active_ios_lock, flags);
+ node->io_alloc_enabled = true;
+ spin_unlock_irqrestore(&node->active_ios_lock, flags);
+}
+
+/* Disable the SCSI and Transport IO allocations */
+void
+efct_scsi_io_alloc_disable(struct efc *efc, struct efc_node *node)
+{
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&node->active_ios_lock, flags);
+ node->io_alloc_enabled = false;
+ spin_unlock_irqrestore(&node->active_ios_lock, flags);
+}
+
+struct efct_io *
+efct_scsi_io_alloc(struct efc_node *node, enum efct_scsi_io_role role)
+{
+ struct efct *efct;
+ struct efc *efcp;
+ struct efct_xport *xport;
+ struct efct_io *io;
+ unsigned long flags = 0;
+
+ efcp = node->efc;
+ efct = efcp->base;
+
+ xport = efct->xport;
+
+ spin_lock_irqsave(&node->active_ios_lock, flags);
+
+ if (!node->io_alloc_enabled) {
+ spin_unlock_irqrestore(&node->active_ios_lock, flags);
+ return NULL;
+ }
+
+ io = efct_io_pool_io_alloc(efct->xport->io_pool);
+ if (!io) {
+ atomic_add_return(1, &xport->io_alloc_failed_count);
+ spin_unlock_irqrestore(&node->active_ios_lock, flags);
+ return NULL;
+ }
+
+ /* initialize refcount */
+ kref_init(&io->ref);
+ io->release = _efct_scsi_io_free;
+
+ if (io->hio) {
+ efc_log_err(efct,
+ "assertion failed: io->hio is not NULL\n");
+ spin_unlock_irqrestore(&node->active_ios_lock, flags);
+ return NULL;
+ }
+
+ /* set generic fields */
+ io->efct = efct;
+ io->node = node;
+
+ /* set type and name */
+ io->io_type = EFCT_IO_TYPE_IO;
+ io->display_name = "scsi_io";
+
+ switch (role) {
+ case EFCT_SCSI_IO_ROLE_ORIGINATOR:
+ io->cmd_ini = true;
+ io->cmd_tgt = false;
+ break;
+ case EFCT_SCSI_IO_ROLE_RESPONDER:
+ io->cmd_ini = false;
+ io->cmd_tgt = true;
+ break;
+ }
+
+ /* Add to node's active_ios list */
+ INIT_LIST_HEAD(&io->list_entry);
+ list_add_tail(&io->list_entry, &node->active_ios);
+
+ spin_unlock_irqrestore(&node->active_ios_lock, flags);
+
+ return io;
+}
+
+void
+_efct_scsi_io_free(struct kref *arg)
+{
+ struct efct_io *io = container_of(arg, struct efct_io, ref);
+ struct efct *efct = io->efct;
+ struct efc_node *node = io->node;
+ int send_empty_event;
+ unsigned long flags = 0;
+
+ scsi_io_trace(io, "freeing io 0x%p %s\n", io, io->display_name);
+
+ if (io->io_free) {
+ efc_log_err(efct, "IO already freed.\n");
+ return;
+ }
+
+ spin_lock_irqsave(&node->active_ios_lock, flags);
+ list_del(&io->list_entry);
+ send_empty_event = (!node->io_alloc_enabled) &&
+ list_empty(&node->active_ios);
+ spin_unlock_irqrestore(&node->active_ios_lock, flags);
+
+ if (send_empty_event)
+ efc_scsi_io_list_empty(node->efc, node);
+
+ io->node = NULL;
+ efct_io_pool_io_free(efct->xport->io_pool, io);
+}
+
+void
+efct_scsi_io_free(struct efct_io *io)
+{
+ scsi_io_trace(io, "freeing io 0x%p %s\n", io, io->display_name);
+ WARN_ON(refcount_read(&io->ref.refcount) != 0);
+ kref_put(&io->ref, io->release);
+}
+
+static void
+efct_target_io_cb(struct efct_hw_io *hio, struct efc_remote_node *rnode,
+ u32 length, int status, u32 ext_status, void *app)
+{
+ struct efct_io *io = app;
+ struct efct *efct;
+ enum efct_scsi_io_status scsi_stat = EFCT_SCSI_STATUS_GOOD;
+
+ if (!io || !io->efct) {
+ pr_err("%s: IO can not be NULL\n", __func__);
+ return;
+ }
+
+ scsi_io_trace(io, "status x%x ext_status x%x\n", status, ext_status);
+
+ efct = io->efct;
+
+ io->transferred += length;
+
+ /* Call target server completion */
+ if (io->scsi_tgt_cb) {
+ efct_scsi_io_cb_t cb = io->scsi_tgt_cb;
+ u32 flags = 0;
+
+ /* Clear the callback before invoking the callback */
+ io->scsi_tgt_cb = NULL;
+
+ /* if status was good, and auto-good-response was set,
+ * then callback target-server with IO_CMPL_RSP_SENT,
+ * otherwise send IO_CMPL
+ */
+ if (status == 0 && io->auto_resp)
+ flags |= EFCT_SCSI_IO_CMPL_RSP_SENT;
+ else
+ flags |= EFCT_SCSI_IO_CMPL;
+
+ switch (status) {
+ case SLI4_FC_WCQE_STATUS_SUCCESS:
+ scsi_stat = EFCT_SCSI_STATUS_GOOD;
+ break;
+ case SLI4_FC_WCQE_STATUS_DI_ERROR:
+ if (ext_status & SLI4_FC_DI_ERROR_GE)
+ scsi_stat = EFCT_SCSI_STATUS_DIF_GUARD_ERR;
+ else if (ext_status & SLI4_FC_DI_ERROR_AE)
+ scsi_stat = EFCT_SCSI_STATUS_DIF_APP_TAG_ERROR;
+ else if (ext_status & SLI4_FC_DI_ERROR_RE)
+ scsi_stat = EFCT_SCSI_STATUS_DIF_REF_TAG_ERROR;
+ else
+ scsi_stat = EFCT_SCSI_STATUS_DIF_UNKNOWN_ERROR;
+ break;
+ case SLI4_FC_WCQE_STATUS_LOCAL_REJECT:
+ switch (ext_status) {
+ case SLI4_FC_LOCAL_REJECT_INVALID_RELOFFSET:
+ case SLI4_FC_LOCAL_REJECT_ABORT_REQUESTED:
+ scsi_stat = EFCT_SCSI_STATUS_ABORTED;
+ break;
+ case SLI4_FC_LOCAL_REJECT_INVALID_RPI:
+ scsi_stat = EFCT_SCSI_STATUS_NEXUS_LOST;
+ break;
+ case SLI4_FC_LOCAL_REJECT_NO_XRI:
+ scsi_stat = EFCT_SCSI_STATUS_NO_IO;
+ break;
+ default:
+ /*we have seen 0x0d(TX_DMA_FAILED err)*/
+ scsi_stat = EFCT_SCSI_STATUS_ERROR;
+ break;
+ }
+ break;
+
+ case SLI4_FC_WCQE_STATUS_TARGET_WQE_TIMEOUT:
+ /* target IO timed out */
+ scsi_stat = EFCT_SCSI_STATUS_TIMEDOUT_AND_ABORTED;
+ break;
+
+ case SLI4_FC_WCQE_STATUS_SHUTDOWN:
+ /* Target IO cancelled by HW */
+ scsi_stat = EFCT_SCSI_STATUS_SHUTDOWN;
+ break;
+
+ default:
+ scsi_stat = EFCT_SCSI_STATUS_ERROR;
+ break;
+ }
+
+ cb(io, scsi_stat, flags, io->scsi_tgt_cb_arg);
+ }
+ efct_scsi_check_pending(efct);
+}
+
+static int
+efct_scsi_build_sgls(struct efct_hw *hw, struct efct_hw_io *hio,
+ struct efct_scsi_sgl *sgl, u32 sgl_count,
+ enum efct_hw_io_type type)
+{
+ int rc;
+ u32 i;
+ struct efct *efct = hw->os;
+
+ /* Initialize HW SGL */
+ rc = efct_hw_io_init_sges(hw, hio, type);
+ if (rc) {
+ efc_log_err(efct, "efct_hw_io_init_sges failed: %d\n", rc);
+ return EFC_FAIL;
+ }
+
+ for (i = 0; i < sgl_count; i++) {
+
+ /* Add data SGE */
+ rc = efct_hw_io_add_sge(hw, hio,
+ sgl[i].addr, sgl[i].len);
+ if (rc) {
+ efc_log_err(efct,
+ "add sge failed cnt=%d rc=%d\n",
+ sgl_count, rc);
+ return rc;
+ }
+ }
+
+ return EFC_SUCCESS;
+}
+
+static void efc_log_sgl(struct efct_io *io)
+{
+ struct efct_hw_io *hio = io->hio;
+ struct sli4_sge *data = NULL;
+ u32 *dword = NULL;
+ u32 i;
+ u32 n_sge;
+
+ scsi_io_trace(io, "def_sgl at 0x%x 0x%08x\n",
+ upper_32_bits(hio->def_sgl.phys),
+ lower_32_bits(hio->def_sgl.phys));
+ n_sge = (hio->sgl == &hio->def_sgl ?
+ hio->n_sge : hio->def_sgl_count);
+ for (i = 0, data = hio->def_sgl.virt; i < n_sge; i++, data++) {
+ dword = (u32 *)data;
+
+ scsi_io_trace(io, "SGL %2d 0x%08x 0x%08x 0x%08x 0x%08x\n",
+ i, dword[0], dword[1], dword[2], dword[3]);
+
+ if (dword[2] & (1U << 31))
+ break;
+ }
+
+}
+
+static int
+efct_scsi_check_pending_async_cb(struct efct_hw *hw, int status,
+ u8 *mqe, void *arg)
+{
+ struct efct_io *io = arg;
+
+ if (io) {
+ if (io->hw_cb) {
+ efct_hw_done_t cb = io->hw_cb;
+
+ io->hw_cb = NULL;
+ (cb)(io->hio, NULL, 0,
+ SLI4_FC_WCQE_STATUS_DISPATCH_ERROR, 0, io);
+ }
+ }
+ return EFC_SUCCESS;
+}
+
+static int
+efct_scsi_io_dispatch_hw_io(struct efct_io *io, struct efct_hw_io *hio)
+{
+ int rc = 0;
+ struct efct *efct = io->efct;
+
+ /* Got a HW IO;
+ * update ini/tgt_task_tag with HW IO info and dispatch
+ */
+ io->hio = hio;
+ if (io->cmd_tgt)
+ io->tgt_task_tag = hio->indicator;
+ else if (io->cmd_ini)
+ io->init_task_tag = hio->indicator;
+ io->hw_tag = hio->reqtag;
+
+ hio->eq = io->hw_priv;
+
+ /* Copy WQ steering */
+ switch (io->wq_steering) {
+ case EFCT_SCSI_WQ_STEERING_CLASS >> EFCT_SCSI_WQ_STEERING_SHIFT:
+ hio->wq_steering = EFCT_HW_WQ_STEERING_CLASS;
+ break;
+ case EFCT_SCSI_WQ_STEERING_REQUEST >> EFCT_SCSI_WQ_STEERING_SHIFT:
+ hio->wq_steering = EFCT_HW_WQ_STEERING_REQUEST;
+ break;
+ case EFCT_SCSI_WQ_STEERING_CPU >> EFCT_SCSI_WQ_STEERING_SHIFT:
+ hio->wq_steering = EFCT_HW_WQ_STEERING_CPU;
+ break;
+ }
+
+ switch (io->io_type) {
+ case EFCT_IO_TYPE_IO:
+ rc = efct_scsi_build_sgls(&efct->hw, io->hio,
+ io->sgl, io->sgl_count, io->hio_type);
+ if (rc)
+ break;
+
+ if (EFCT_LOG_ENABLE_SCSI_TRACE(efct))
+ efc_log_sgl(io);
+
+ if (io->app_id)
+ io->iparam.fcp_tgt.app_id = io->app_id;
+
+ rc = efct_hw_io_send(&io->efct->hw, io->hio_type, io->hio,
+ io->wire_len, &io->iparam,
+ &io->node->rnode, io->hw_cb, io);
+ break;
+ case EFCT_IO_TYPE_ELS:
+ case EFCT_IO_TYPE_CT:
+ rc = efct_hw_srrs_send(&efct->hw, io->hio_type, io->hio,
+ &io->els_req, io->wire_len,
+ &io->els_rsp, &io->node->rnode, &io->iparam,
+ io->hw_cb, io);
+ break;
+ case EFCT_IO_TYPE_CT_RESP:
+ rc = efct_hw_srrs_send(&efct->hw, io->hio_type, io->hio,
+ &io->els_rsp, io->wire_len,
+ NULL, &io->node->rnode, &io->iparam,
+ io->hw_cb, io);
+ break;
+ case EFCT_IO_TYPE_BLS_RESP:
+ /* no need to update tgt_task_tag for BLS response since
+ * the RX_ID will be specified by the payload, not the XRI
+ */
+ rc = efct_hw_srrs_send(&efct->hw, io->hio_type, io->hio,
+ NULL, 0, NULL, &io->node->rnode,
+ &io->iparam, io->hw_cb, io);
+ break;
+ default:
+ scsi_io_printf(io, "Unknown IO type=%d\n", io->io_type);
+ rc = -1;
+ break;
+ }
+ return rc;
+}
+
+static int
+efct_scsi_io_dispatch_no_hw_io(struct efct_io *io)
+{
+ int rc;
+
+ switch (io->io_type) {
+ case EFCT_IO_TYPE_ABORT: {
+ struct efct_hw_io *hio_to_abort = NULL;
+
+ hio_to_abort = io->io_to_abort->hio;
+
+ if (!hio_to_abort) {
+ /*
+ * If "IO to abort" does not have an
+ * associated HW IO, immediately make callback with
+ * success. The command must have been sent to
+ * the backend, but the data phase has not yet
+ * started, so we don't have a HW IO.
+ *
+ * Note: since the backend shims should be
+ * taking a reference on io_to_abort, it should not
+ * be possible to have been completed and freed by
+ * the backend before the abort got here.
+ */
+ scsi_io_printf(io, "IO: not active\n");
+ ((efct_hw_done_t)io->hw_cb)(io->hio, NULL, 0,
+ SLI4_FC_WCQE_STATUS_SUCCESS, 0, io);
+ rc = 0;
+ } else {
+ /* HW IO is valid, abort it */
+ scsi_io_printf(io, "aborting\n");
+ rc = efct_hw_io_abort(&io->efct->hw, hio_to_abort,
+ io->send_abts, io->hw_cb, io);
+ if (rc) {
+ int status = SLI4_FC_WCQE_STATUS_SUCCESS;
+
+ if (rc != EFCT_HW_RTN_IO_NOT_ACTIVE &&
+ rc != EFCT_HW_RTN_IO_ABORT_IN_PROGRESS) {
+ status = -1;
+ scsi_io_printf(io,
+ "Failed to abort IO: status=%d\n",
+ rc);
+ }
+ ((efct_hw_done_t)io->hw_cb)(io->hio,
+ NULL, 0, status, 0, io);
+ rc = 0;
+ }
+ }
+
+ break;
+ }
+ default:
+ scsi_io_printf(io, "Unknown IO type=%d\n", io->io_type);
+ rc = -1;
+ break;
+ }
+ return rc;
+}
+
+/**
+ * Check for pending IOs to dispatch.
+ *
+ * If there are IOs on the pending list, and a HW IO is available, then
+ * dispatch the IOs.
+ */
+void
+efct_scsi_check_pending(struct efct *efct)
+{
+ struct efct_xport *xport = efct->xport;
+ struct efct_io *io = NULL;
+ struct efct_hw_io *hio;
+ int status;
+ int count = 0;
+ int dispatch;
+ unsigned long flags = 0;
+
+ /* Guard against recursion */
+ if (atomic_add_return(1, &xport->io_pending_recursing)) {
+ /* This function is already running. Decrement and return. */
+ atomic_sub_return(1, &xport->io_pending_recursing);
+ return;
+ }
+
+ do {
+ spin_lock_irqsave(&xport->io_pending_lock, flags);
+ status = 0;
+ hio = NULL;
+ if (!list_empty(&xport->io_pending_list)) {
+ io = list_first_entry(&xport->io_pending_list,
+ struct efct_io,
+ io_pending_link);
+ }
+ if (io) {
+ list_del(&io->io_pending_link);
+ if (io->io_type == EFCT_IO_TYPE_ABORT) {
+ hio = NULL;
+ } else {
+ hio = efct_hw_io_alloc(&efct->hw);
+ if (!hio) {
+ /*
+ * No HW IO available.Put IO back on
+ * the front of pending list
+ */
+ list_add(&xport->io_pending_list,
+ &io->io_pending_link);
+ io = NULL;
+ } else {
+ hio->eq = io->hw_priv;
+ }
+ }
+ }
+ /* Must drop the lock before dispatching the IO */
+ spin_unlock_irqrestore(&xport->io_pending_lock, flags);
+
+ if (io) {
+ count++;
+
+ /*
+ * We pulled an IO off the pending list,
+ * and either got an HW IO or don't need one
+ */
+ atomic_sub_return(1, &xport->io_pending_count);
+ if (!hio)
+ status = efct_scsi_io_dispatch_no_hw_io(io);
+ else
+ status = efct_scsi_io_dispatch_hw_io(io, hio);
+ if (status) {
+ /*
+ * Invoke the HW callback, but do so in the
+ * separate execution context,provided by the
+ * NOP mailbox completion processing context
+ * by using efct_hw_async_call()
+ */
+ if (efct_hw_async_call(&efct->hw,
+ efct_scsi_check_pending_async_cb,
+ io)) {
+ efc_log_test(efct,
+ "call hw async failed\n");
+ }
+ }
+ }
+ } while (io);
+
+ /*
+ * If nothing was removed from the list,
+ * we might be in a case where we need to abort an
+ * active IO and the abort is on the pending list.
+ * Look for an abort we can dispatch.
+ */
+ if (count == 0) {
+ dispatch = 0;
+
+ spin_lock_irqsave(&xport->io_pending_lock, flags);
+ list_for_each_entry(io, &xport->io_pending_list,
+ io_pending_link) {
+ if (io->io_type == EFCT_IO_TYPE_ABORT) {
+ if (io->io_to_abort->hio) {
+ /* This IO has a HW IO, so it is
+ * active. Dispatch the abort.
+ */
+ dispatch = 1;
+ } else {
+ /* Leave this abort on the pending
+ * list and keep looking
+ */
+ dispatch = 0;
+ }
+ }
+ if (dispatch) {
+ list_del(&io->io_pending_link);
+ atomic_sub_return(1, &xport->io_pending_count);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&xport->io_pending_lock, flags);
+
+ if (dispatch) {
+ status = efct_scsi_io_dispatch_no_hw_io(io);
+ if (status) {
+ if (efct_hw_async_call(&efct->hw,
+ efct_scsi_check_pending_async_cb,
+ io)) {
+ efc_log_test(efct,
+ "call to hw async failed\n");
+ }
+ }
+ }
+ }
+
+ atomic_sub_return(1, &xport->io_pending_recursing);
+}
+
+/**
+ * An IO is dispatched:
+ * - if the pending list is not empty, add IO to pending list
+ * and call a function to process the pending list.
+ * - if pending list is empty, try to allocate a HW IO. If none
+ * is available, place this IO at the tail of the pending IO
+ * list.
+ * - if HW IO is available, attach this IO to the HW IO and
+ * submit it.
+ */
+int
+efct_scsi_io_dispatch(struct efct_io *io, void *cb)
+{
+ struct efct_hw_io *hio;
+ struct efct *efct = io->efct;
+ struct efct_xport *xport = efct->xport;
+ unsigned long flags = 0;
+
+ io->hw_cb = cb;
+
+ /*
+ * if this IO already has a HW IO, then this is either
+ * not the first phase of the IO. Send it to the HW.
+ */
+ if (io->hio)
+ return efct_scsi_io_dispatch_hw_io(io, io->hio);
+
+ /*
+ * We don't already have a HW IO associated with the IO. First check
+ * the pending list. If not empty, add IO to the tail and process the
+ * pending list.
+ */
+ spin_lock_irqsave(&xport->io_pending_lock, flags);
+ if (!list_empty(&xport->io_pending_list)) {
+ /*
+ * If this is a low latency request,
+ * the put at the front of the IO pending
+ * queue, otherwise put it at the end of the queue.
+ */
+ if (io->low_latency) {
+ INIT_LIST_HEAD(&io->io_pending_link);
+ list_add(&xport->io_pending_list,
+ &io->io_pending_link);
+ } else {
+ INIT_LIST_HEAD(&io->io_pending_link);
+ list_add_tail(&io->io_pending_link,
+ &xport->io_pending_list);
+ }
+ spin_unlock_irqrestore(&xport->io_pending_lock, flags);
+ atomic_add_return(1, &xport->io_pending_count);
+ atomic_add_return(1, &xport->io_total_pending);
+
+ /* process pending list */
+ efct_scsi_check_pending(efct);
+ return EFC_SUCCESS;
+ }
+ spin_unlock_irqrestore(&xport->io_pending_lock, flags);
+
+ /*
+ * We don't have a HW IO associated with the IO and there's nothing
+ * on the pending list. Attempt to allocate a HW IO and dispatch it.
+ */
+ hio = efct_hw_io_alloc(&io->efct->hw);
+ if (!hio) {
+ /* Couldn't get a HW IO. Save this IO on the pending list */
+ spin_lock_irqsave(&xport->io_pending_lock, flags);
+ INIT_LIST_HEAD(&io->io_pending_link);
+ list_add_tail(&io->io_pending_link, &xport->io_pending_list);
+ spin_unlock_irqrestore(&xport->io_pending_lock, flags);
+
+ atomic_add_return(1, &xport->io_total_pending);
+ atomic_add_return(1, &xport->io_pending_count);
+ return EFC_SUCCESS;
+ }
+
+ /* We successfully allocated a HW IO; dispatch to HW */
+ return efct_scsi_io_dispatch_hw_io(io, hio);
+}
+
+/**
+ * An Abort IO is dispatched:
+ * - if the pending list is not empty, add IO to pending list
+ * and call a function to process the pending list.
+ * - if pending list is empty, send abort to the HW.
+ */
+
+int
+efct_scsi_io_dispatch_abort(struct efct_io *io, void *cb)
+{
+ struct efct *efct = io->efct;
+ struct efct_xport *xport = efct->xport;
+ unsigned long flags = 0;
+
+ io->hw_cb = cb;
+
+ /*
+ * For aborts, we don't need a HW IO, but we still want
+ * to pass through the pending list to preserve ordering.
+ * Thus, if the pending list is not empty, add this abort
+ * to the pending list and process the pending list.
+ */
+ spin_lock_irqsave(&xport->io_pending_lock, flags);
+ if (!list_empty(&xport->io_pending_list)) {
+ INIT_LIST_HEAD(&io->io_pending_link);
+ list_add_tail(&io->io_pending_link,
+ &xport->io_pending_list);
+ spin_unlock_irqrestore(&xport->io_pending_lock, flags);
+ atomic_add_return(1, &xport->io_pending_count);
+ atomic_add_return(1, &xport->io_total_pending);
+
+ /* process pending list */
+ efct_scsi_check_pending(efct);
+ return EFC_SUCCESS;
+ }
+ spin_unlock_irqrestore(&xport->io_pending_lock, flags);
+
+ /* nothing on pending list, dispatch abort */
+ return efct_scsi_io_dispatch_no_hw_io(io);
+}
+
+static inline int
+efct_scsi_xfer_data(struct efct_io *io, u32 flags,
+ struct efct_scsi_sgl *sgl, u32 sgl_count, u64 xwire_len,
+ enum efct_hw_io_type type, int enable_ar,
+ efct_scsi_io_cb_t cb, void *arg)
+{
+ struct efct *efct;
+ size_t residual = 0;
+
+ io->sgl_count = sgl_count;
+
+ efct = io->efct;
+
+ scsi_io_trace(io, "%s wire_len %llu\n",
+ (type == EFCT_HW_IO_TARGET_READ) ? "send" : "recv",
+ xwire_len);
+
+ io->hio_type = type;
+
+ io->scsi_tgt_cb = cb;
+ io->scsi_tgt_cb_arg = arg;
+
+ residual = io->exp_xfer_len - io->transferred;
+ io->wire_len = (xwire_len < residual) ? xwire_len : residual;
+ residual = (xwire_len - io->wire_len);
+
+ memset(&io->iparam, 0, sizeof(io->iparam));
+ io->iparam.fcp_tgt.ox_id = io->init_task_tag;
+ io->iparam.fcp_tgt.offset = io->transferred;
+ io->iparam.fcp_tgt.cs_ctl = io->cs_ctl;
+ io->iparam.fcp_tgt.timeout = io->timeout;
+
+ /* if this is the last data phase and there is no residual, enable
+ * auto-good-response
+ */
+ if (enable_ar && (flags & EFCT_SCSI_LAST_DATAPHASE) &&
+ residual == 0 &&
+ ((io->transferred + io->wire_len) == io->exp_xfer_len) &&
+ (!(flags & EFCT_SCSI_NO_AUTO_RESPONSE))) {
+ io->iparam.fcp_tgt.flags |= SLI4_IO_AUTO_GOOD_RESPONSE;
+ io->auto_resp = true;
+ } else {
+ io->auto_resp = false;
+ }
+
+ /* save this transfer length */
+ io->xfer_req = io->wire_len;
+
+ /* Adjust the transferred count to account for overrun
+ * when the residual is calculated in efct_scsi_send_resp
+ */
+ io->transferred += residual;
+
+ /* Adjust the SGL size if there is overrun */
+
+ if (residual) {
+ struct efct_scsi_sgl *sgl_ptr = &io->sgl[sgl_count - 1];
+
+ while (residual) {
+ size_t len = sgl_ptr->len;
+
+ if (len > residual) {
+ sgl_ptr->len = len - residual;
+ residual = 0;
+ } else {
+ sgl_ptr->len = 0;
+ residual -= len;
+ io->sgl_count--;
+ }
+ sgl_ptr--;
+ }
+ }
+
+ /* Set latency and WQ steering */
+ io->low_latency = (flags & EFCT_SCSI_LOW_LATENCY) != 0;
+ io->wq_steering = (flags & EFCT_SCSI_WQ_STEERING_MASK) >>
+ EFCT_SCSI_WQ_STEERING_SHIFT;
+ io->wq_class = (flags & EFCT_SCSI_WQ_CLASS_MASK) >>
+ EFCT_SCSI_WQ_CLASS_SHIFT;
+
+ if (efct->xport) {
+ struct efct_xport *xport = efct->xport;
+
+ if (type == EFCT_HW_IO_TARGET_READ) {
+ xport->fcp_stats.input_requests++;
+ xport->fcp_stats.input_bytes += xwire_len;
+ } else if (type == EFCT_HW_IO_TARGET_WRITE) {
+ xport->fcp_stats.output_requests++;
+ xport->fcp_stats.output_bytes += xwire_len;
+ }
+ }
+ return efct_scsi_io_dispatch(io, efct_target_io_cb);
+}
+
+int
+efct_scsi_send_rd_data(struct efct_io *io, u32 flags,
+ struct efct_scsi_sgl *sgl, u32 sgl_count, u64 len,
+ efct_scsi_io_cb_t cb, void *arg)
+{
+ return efct_scsi_xfer_data(io, flags, sgl, sgl_count,
+ len, EFCT_HW_IO_TARGET_READ,
+ enable_tsend_auto_resp(io->efct), cb, arg);
+}
+
+int
+efct_scsi_recv_wr_data(struct efct_io *io, u32 flags,
+ struct efct_scsi_sgl *sgl, u32 sgl_count, u64 len,
+ efct_scsi_io_cb_t cb, void *arg)
+{
+ return efct_scsi_xfer_data(io, flags, sgl, sgl_count, len,
+ EFCT_HW_IO_TARGET_WRITE,
+ enable_treceive_auto_resp(io->efct), cb, arg);
+}
+
+int
+efct_scsi_send_resp(struct efct_io *io, u32 flags,
+ struct efct_scsi_cmd_resp *rsp,
+ efct_scsi_io_cb_t cb, void *arg)
+{
+ struct efct *efct;
+ int residual;
+ bool auto_resp = true; /* Always try auto resp */
+ u8 scsi_status = 0;
+ u16 scsi_status_qualifier = 0;
+ u8 *sense_data = NULL;
+ u32 sense_data_length = 0;
+
+ efct = io->efct;
+
+ if (rsp) {
+ scsi_status = rsp->scsi_status;
+ scsi_status_qualifier = rsp->scsi_status_qualifier;
+ sense_data = rsp->sense_data;
+ sense_data_length = rsp->sense_data_length;
+ residual = rsp->residual;
+ } else {
+ residual = io->exp_xfer_len - io->transferred;
+ }
+
+ io->wire_len = 0;
+ io->hio_type = EFCT_HW_IO_TARGET_RSP;
+
+ io->scsi_tgt_cb = cb;
+ io->scsi_tgt_cb_arg = arg;
+
+ memset(&io->iparam, 0, sizeof(io->iparam));
+ io->iparam.fcp_tgt.ox_id = io->init_task_tag;
+ io->iparam.fcp_tgt.offset = 0;
+ io->iparam.fcp_tgt.cs_ctl = io->cs_ctl;
+ io->iparam.fcp_tgt.timeout = io->timeout;
+
+ /* Set low latency queueing request */
+ io->low_latency = (flags & EFCT_SCSI_LOW_LATENCY) != 0;
+ io->wq_steering = (flags & EFCT_SCSI_WQ_STEERING_MASK) >>
+ EFCT_SCSI_WQ_STEERING_SHIFT;
+ io->wq_class = (flags & EFCT_SCSI_WQ_CLASS_MASK) >>
+ EFCT_SCSI_WQ_CLASS_SHIFT;
+
+ if (scsi_status != 0 || residual || sense_data_length) {
+ struct fcp_resp_with_ext *fcprsp = io->rspbuf.virt;
+ u8 *sns_data = io->rspbuf.virt + sizeof(*fcprsp);
+
+ if (!fcprsp) {
+ efc_log_err(efct, "NULL response buffer\n");
+ return EFC_FAIL;
+ }
+
+ auto_resp = false;
+
+ memset(fcprsp, 0, sizeof(*fcprsp));
+
+ io->wire_len += sizeof(*fcprsp);
+
+ fcprsp->resp.fr_status = scsi_status;
+ fcprsp->resp.fr_retry_delay =
+ cpu_to_be16(scsi_status_qualifier);
+
+ /* set residual status if necessary */
+ if (residual != 0) {
+ /* FCP: if data transferred is less than the
+ * amount expected, then this is an underflow.
+ * If data transferred would have been greater
+ * than the amount expected this is an overflow
+ */
+ if (residual > 0) {
+ fcprsp->resp.fr_flags |= FCP_RESID_UNDER;
+ fcprsp->ext.fr_resid = cpu_to_be32(residual);
+ } else {
+ fcprsp->resp.fr_flags |= FCP_RESID_OVER;
+ fcprsp->ext.fr_resid = cpu_to_be32(-residual);
+ }
+ }
+
+ if (EFCT_SCSI_SNS_BUF_VALID(sense_data) && sense_data_length) {
+ if (sense_data_length > SCSI_SENSE_BUFFERSIZE) {
+ efc_log_err(efct, "Sense exceeds max size.\n");
+ return EFC_FAIL;
+ }
+
+ fcprsp->resp.fr_flags |= FCP_SNS_LEN_VAL;
+ memcpy(sns_data, sense_data, sense_data_length);
+ fcprsp->ext.fr_sns_len = cpu_to_be32(sense_data_length);
+ io->wire_len += sense_data_length;
+ }
+
+ io->sgl[0].addr = io->rspbuf.phys;
+ //io->sgl[0].dif_addr = 0;
+ io->sgl[0].len = io->wire_len;
+ io->sgl_count = 1;
+ }
+
+ if (auto_resp)
+ io->iparam.fcp_tgt.flags |= SLI4_IO_AUTO_GOOD_RESPONSE;
+
+ return efct_scsi_io_dispatch(io, efct_target_io_cb);
+}
+
+static int
+efct_target_bls_resp_cb(struct efct_hw_io *hio,
+ struct efc_remote_node *rnode,
+ u32 length, int status, u32 ext_status, void *app)
+{
+ struct efct_io *io = app;
+ struct efct *efct;
+ enum efct_scsi_io_status bls_status;
+
+ efct = io->efct;
+
+ /* BLS isn't really a "SCSI" concept, but use SCSI status */
+ if (status) {
+ io_error_log(io, "s=%#x x=%#x\n", status, ext_status);
+ bls_status = EFCT_SCSI_STATUS_ERROR;
+ } else {
+ bls_status = EFCT_SCSI_STATUS_GOOD;
+ }
+
+ if (io->bls_cb) {
+ efct_scsi_io_cb_t bls_cb = io->bls_cb;
+ void *bls_cb_arg = io->bls_cb_arg;
+
+ io->bls_cb = NULL;
+ io->bls_cb_arg = NULL;
+
+ /* invoke callback */
+ bls_cb(io, bls_status, 0, bls_cb_arg);
+ }
+
+ efct_scsi_check_pending(efct);
+ return EFC_SUCCESS;
+}
+
+static int
+efct_target_send_bls_resp(struct efct_io *io,
+ efct_scsi_io_cb_t cb, void *arg)
+{
+ int rc;
+ struct fc_ba_acc *acc;
+
+ /* fill out IO structure with everything needed to send BA_ACC */
+ memset(&io->iparam, 0, sizeof(io->iparam));
+ io->iparam.bls.ox_id = io->init_task_tag;
+ io->iparam.bls.rx_id = io->abort_rx_id;
+
+ acc = (void *)io->iparam.bls.payload;
+
+ memset(io->iparam.bls.payload, 0,
+ sizeof(io->iparam.bls.payload));
+ acc->ba_ox_id = cpu_to_be16(io->iparam.bls.ox_id);
+ acc->ba_rx_id = cpu_to_be16(io->iparam.bls.rx_id);
+ acc->ba_high_seq_cnt = cpu_to_be16(U16_MAX);
+
+ /* generic io fields have already been populated */
+
+ /* set type and BLS-specific fields */
+ io->io_type = EFCT_IO_TYPE_BLS_RESP;
+ io->display_name = "bls_rsp";
+ io->hio_type = EFCT_HW_BLS_ACC;
+ io->bls_cb = cb;
+ io->bls_cb_arg = arg;
+
+ /* dispatch IO */
+ rc = efct_scsi_io_dispatch(io, efct_target_bls_resp_cb);
+ return rc;
+}
+
+int
+efct_scsi_send_tmf_resp(struct efct_io *io,
+ enum efct_scsi_tmf_resp rspcode,
+ u8 addl_rsp_info[3],
+ efct_scsi_io_cb_t cb, void *arg)
+{
+ int rc = -1;
+ struct fcp_resp_with_ext *fcprsp = NULL;
+ struct fcp_resp_rsp_info *rspinfo = NULL;
+ u8 fcp_rspcode;
+
+ io->wire_len = 0;
+
+ switch (rspcode) {
+ case EFCT_SCSI_TMF_FUNCTION_COMPLETE:
+ fcp_rspcode = FCP_TMF_CMPL;
+ break;
+ case EFCT_SCSI_TMF_FUNCTION_SUCCEEDED:
+ case EFCT_SCSI_TMF_FUNCTION_IO_NOT_FOUND:
+ fcp_rspcode = FCP_TMF_CMPL;
+ break;
+ case EFCT_SCSI_TMF_FUNCTION_REJECTED:
+ fcp_rspcode = FCP_TMF_REJECTED;
+ break;
+ case EFCT_SCSI_TMF_INCORRECT_LOGICAL_UNIT_NUMBER:
+ fcp_rspcode = FCP_TMF_INVALID_LUN;
+ break;
+ case EFCT_SCSI_TMF_SERVICE_DELIVERY:
+ fcp_rspcode = FCP_TMF_FAILED;
+ break;
+ default:
+ fcp_rspcode = FCP_TMF_REJECTED;
+ break;
+ }
+
+ io->hio_type = EFCT_HW_IO_TARGET_RSP;
+
+ io->scsi_tgt_cb = cb;
+ io->scsi_tgt_cb_arg = arg;
+
+ if (io->tmf_cmd == EFCT_SCSI_TMF_ABORT_TASK) {
+ rc = efct_target_send_bls_resp(io, cb, arg);
+ return rc;
+ }
+
+ /* populate the FCP TMF response */
+ fcprsp = io->rspbuf.virt;
+ memset(fcprsp, 0, sizeof(*fcprsp));
+
+ fcprsp->resp.fr_flags |= FCP_SNS_LEN_VAL;
+
+ rspinfo = io->rspbuf.virt + sizeof(*fcprsp);
+ if (addl_rsp_info) {
+ memcpy(rspinfo->_fr_resvd, addl_rsp_info,
+ sizeof(rspinfo->_fr_resvd));
+ }
+ rspinfo->rsp_code = fcp_rspcode;
+
+ io->wire_len = sizeof(*fcprsp) + sizeof(*rspinfo);
+
+ fcprsp->ext.fr_rsp_len = cpu_to_be32(sizeof(*rspinfo));
+
+ io->sgl[0].addr = io->rspbuf.phys;
+ io->sgl[0].dif_addr = 0;
+ io->sgl[0].len = io->wire_len;
+ io->sgl_count = 1;
+
+ memset(&io->iparam, 0, sizeof(io->iparam));
+ io->iparam.fcp_tgt.ox_id = io->init_task_tag;
+ io->iparam.fcp_tgt.offset = 0;
+ io->iparam.fcp_tgt.cs_ctl = io->cs_ctl;
+ io->iparam.fcp_tgt.timeout = io->timeout;
+
+ rc = efct_scsi_io_dispatch(io, efct_target_io_cb);
+
+ return rc;
+}
+
+static int
+efct_target_abort_cb(struct efct_hw_io *hio,
+ struct efc_remote_node *rnode,
+ u32 length, int status,
+ u32 ext_status, void *app)
+{
+ struct efct_io *io = app;
+ struct efct *efct;
+ enum efct_scsi_io_status scsi_status;
+
+ efct = io->efct;
+
+ if (io->abort_cb) {
+ efct_scsi_io_cb_t abort_cb = io->abort_cb;
+ void *abort_cb_arg = io->abort_cb_arg;
+
+ io->abort_cb = NULL;
+ io->abort_cb_arg = NULL;
+
+ switch (status) {
+ case SLI4_FC_WCQE_STATUS_SUCCESS:
+ scsi_status = EFCT_SCSI_STATUS_GOOD;
+ break;
+ case SLI4_FC_WCQE_STATUS_LOCAL_REJECT:
+ switch (ext_status) {
+ case SLI4_FC_LOCAL_REJECT_NO_XRI:
+ scsi_status = EFCT_SCSI_STATUS_NO_IO;
+ break;
+ case SLI4_FC_LOCAL_REJECT_ABORT_IN_PROGRESS:
+ scsi_status =
+ EFCT_SCSI_STATUS_ABORT_IN_PROGRESS;
+ break;
+ default:
+ /*we have seen 0x15 (abort in progress)*/
+ scsi_status = EFCT_SCSI_STATUS_ERROR;
+ break;
+ }
+ break;
+ case SLI4_FC_WCQE_STATUS_FCP_RSP_FAILURE:
+ scsi_status = EFCT_SCSI_STATUS_CHECK_RESPONSE;
+ break;
+ default:
+ scsi_status = EFCT_SCSI_STATUS_ERROR;
+ break;
+ }
+ /* invoke callback */
+ abort_cb(io->io_to_abort, scsi_status, 0, abort_cb_arg);
+ }
+
+ /* done with IO to abort,efct_ref_get(): efct_scsi_tgt_abort_io() */
+ kref_put(&io->io_to_abort->ref, io->io_to_abort->release);
+
+ efct_io_pool_io_free(efct->xport->io_pool, io);
+
+ efct_scsi_check_pending(efct);
+ return EFC_SUCCESS;
+}
+
+int
+efct_scsi_tgt_abort_io(struct efct_io *io, efct_scsi_io_cb_t cb, void *arg)
+{
+ struct efct *efct;
+ struct efct_xport *xport;
+ int rc;
+ struct efct_io *abort_io = NULL;
+
+ efct = io->efct;
+ xport = efct->xport;
+
+ /* take a reference on IO being aborted */
+ if ((kref_get_unless_zero(&io->ref) == 0)) {
+ /* command no longer active */
+ scsi_io_printf(io, "command no longer active\n");
+ return EFC_FAIL;
+ }
+
+ /*
+ * allocate a new IO to send the abort request. Use efct_io_alloc()
+ * directly, as we need an IO object that will not fail allocation
+ * due to allocations being disabled (in efct_scsi_io_alloc())
+ */
+ abort_io = efct_io_pool_io_alloc(efct->xport->io_pool);
+ if (!abort_io) {
+ atomic_add_return(1, &xport->io_alloc_failed_count);
+ kref_put(&io->ref, io->release);
+ return EFC_FAIL;
+ }
+
+ /* Save the target server callback and argument */
+ /* set generic fields */
+ abort_io->cmd_tgt = true;
+ abort_io->node = io->node;
+
+ /* set type and abort-specific fields */
+ abort_io->io_type = EFCT_IO_TYPE_ABORT;
+ abort_io->display_name = "tgt_abort";
+ abort_io->io_to_abort = io;
+ abort_io->send_abts = false;
+ abort_io->abort_cb = cb;
+ abort_io->abort_cb_arg = arg;
+
+ /* now dispatch IO */
+ rc = efct_scsi_io_dispatch_abort(abort_io, efct_target_abort_cb);
+ if (rc)
+ kref_put(&io->ref, io->release);
+ return rc;
+}
+
+void
+efct_scsi_io_complete(struct efct_io *io)
+{
+ if (io->io_free) {
+ efc_log_test(io->efct,
+ "Got completion for non-busy io with tag 0x%x\n",
+ io->tag);
+ return;
+ }
+
+ scsi_io_trace(io, "freeing io 0x%p %s\n", io, io->display_name);
+ kref_put(&io->ref, io->release);
+}
diff --git a/drivers/scsi/elx/efct/efct_scsi.h b/drivers/scsi/elx/efct/efct_scsi.h
new file mode 100644
index 000000000000..28204c5fde69
--- /dev/null
+++ b/drivers/scsi/elx/efct/efct_scsi.h
@@ -0,0 +1,235 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 Broadcom. All Rights Reserved. The term
+ * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
+ */
+
+#if !defined(__EFCT_SCSI_H__)
+#define __EFCT_SCSI_H__
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport_fc.h>
+
+/* efct_scsi_rcv_cmd() efct_scsi_rcv_tmf() flags */
+#define EFCT_SCSI_CMD_DIR_IN (1 << 0)
+#define EFCT_SCSI_CMD_DIR_OUT (1 << 1)
+#define EFCT_SCSI_CMD_SIMPLE (1 << 2)
+#define EFCT_SCSI_CMD_HEAD_OF_QUEUE (1 << 3)
+#define EFCT_SCSI_CMD_ORDERED (1 << 4)
+#define EFCT_SCSI_CMD_UNTAGGED (1 << 5)
+#define EFCT_SCSI_CMD_ACA (1 << 6)
+#define EFCT_SCSI_FIRST_BURST_ERR (1 << 7)
+#define EFCT_SCSI_FIRST_BURST_ABORTED (1 << 8)
+
+/* efct_scsi_send_rd_data/recv_wr_data/send_resp flags */
+#define EFCT_SCSI_LAST_DATAPHASE (1 << 0)
+#define EFCT_SCSI_NO_AUTO_RESPONSE (1 << 1)
+#define EFCT_SCSI_LOW_LATENCY (1 << 2)
+
+#define EFCT_SCSI_SNS_BUF_VALID(sense) ((sense) && \
+ (0x70 == (((const u8 *)(sense))[0] & 0x70)))
+
+#define EFCT_SCSI_WQ_STEERING_SHIFT 16
+#define EFCT_SCSI_WQ_STEERING_MASK (0xf << EFCT_SCSI_WQ_STEERING_SHIFT)
+#define EFCT_SCSI_WQ_STEERING_CLASS (0 << EFCT_SCSI_WQ_STEERING_SHIFT)
+#define EFCT_SCSI_WQ_STEERING_REQUEST (1 << EFCT_SCSI_WQ_STEERING_SHIFT)
+#define EFCT_SCSI_WQ_STEERING_CPU (2 << EFCT_SCSI_WQ_STEERING_SHIFT)
+
+#define EFCT_SCSI_WQ_CLASS_SHIFT (20)
+#define EFCT_SCSI_WQ_CLASS_MASK (0xf << EFCT_SCSI_WQ_CLASS_SHIFT)
+#define EFCT_SCSI_WQ_CLASS(x) ((x & EFCT_SCSI_WQ_CLASS_MASK) << \
+ EFCT_SCSI_WQ_CLASS_SHIFT)
+
+#define EFCT_SCSI_WQ_CLASS_LOW_LATENCY 1
+
+struct efct_scsi_cmd_resp {
+ u8 scsi_status; /* SCSI status */
+ u16 scsi_status_qualifier; /* SCSI status qualifier */
+ /* pointer to response data buffer */
+ u8 *response_data;
+ /* length of response data buffer (bytes) */
+ u32 response_data_length;
+ u8 *sense_data; /* pointer to sense data buffer */
+ /* length of sense data buffer (bytes) */
+ u32 sense_data_length;
+ /* command residual (not used for target), positive value
+ * indicates an underflow, negative value indicates overflow
+ */
+ int residual;
+ /* Command response length received in wcqe */
+ u32 response_wire_length;
+};
+
+struct efct_vport {
+ struct efct *efct;
+ bool is_vport;
+ struct fc_host_statistics fc_host_stats;
+ struct Scsi_Host *shost;
+ struct fc_vport *fc_vport;
+ u64 npiv_wwpn;
+ u64 npiv_wwnn;
+};
+
+/* Status values returned by IO callbacks */
+enum efct_scsi_io_status {
+ EFCT_SCSI_STATUS_GOOD = 0,
+ EFCT_SCSI_STATUS_ABORTED,
+ EFCT_SCSI_STATUS_ERROR,
+ EFCT_SCSI_STATUS_DIF_GUARD_ERR,
+ EFCT_SCSI_STATUS_DIF_REF_TAG_ERROR,
+ EFCT_SCSI_STATUS_DIF_APP_TAG_ERROR,
+ EFCT_SCSI_STATUS_DIF_UNKNOWN_ERROR,
+ EFCT_SCSI_STATUS_PROTOCOL_CRC_ERROR,
+ EFCT_SCSI_STATUS_NO_IO,
+ EFCT_SCSI_STATUS_ABORT_IN_PROGRESS,
+ EFCT_SCSI_STATUS_CHECK_RESPONSE,
+ EFCT_SCSI_STATUS_COMMAND_TIMEOUT,
+ EFCT_SCSI_STATUS_TIMEDOUT_AND_ABORTED,
+ EFCT_SCSI_STATUS_SHUTDOWN,
+ EFCT_SCSI_STATUS_NEXUS_LOST,
+};
+
+struct efct_io;
+struct efc_node;
+struct efc_domain;
+struct efc_sli_port;
+
+/* Callback used by send_rd_data(), recv_wr_data(), send_resp() */
+typedef int (*efct_scsi_io_cb_t)(struct efct_io *io,
+ enum efct_scsi_io_status status,
+ u32 flags, void *arg);
+
+/* Callback used by send_rd_io(), send_wr_io() */
+typedef int (*efct_scsi_rsp_io_cb_t)(struct efct_io *io,
+ enum efct_scsi_io_status status,
+ struct efct_scsi_cmd_resp *rsp,
+ u32 flags, void *arg);
+
+/* efct_scsi_cb_t flags */
+#define EFCT_SCSI_IO_CMPL (1 << 0)
+/* IO completed, response sent */
+#define EFCT_SCSI_IO_CMPL_RSP_SENT (1 << 1)
+#define EFCT_SCSI_IO_ABORTED (1 << 2)
+
+/* efct_scsi_recv_tmf() request values */
+enum efct_scsi_tmf_cmd {
+ EFCT_SCSI_TMF_ABORT_TASK = 1,
+ EFCT_SCSI_TMF_QUERY_TASK_SET,
+ EFCT_SCSI_TMF_ABORT_TASK_SET,
+ EFCT_SCSI_TMF_CLEAR_TASK_SET,
+ EFCT_SCSI_TMF_QUERY_ASYNCHRONOUS_EVENT,
+ EFCT_SCSI_TMF_LOGICAL_UNIT_RESET,
+ EFCT_SCSI_TMF_CLEAR_ACA,
+ EFCT_SCSI_TMF_TARGET_RESET,
+};
+
+/* efct_scsi_send_tmf_resp() response values */
+enum efct_scsi_tmf_resp {
+ EFCT_SCSI_TMF_FUNCTION_COMPLETE = 1,
+ EFCT_SCSI_TMF_FUNCTION_SUCCEEDED,
+ EFCT_SCSI_TMF_FUNCTION_IO_NOT_FOUND,
+ EFCT_SCSI_TMF_FUNCTION_REJECTED,
+ EFCT_SCSI_TMF_INCORRECT_LOGICAL_UNIT_NUMBER,
+ EFCT_SCSI_TMF_SERVICE_DELIVERY,
+};
+
+struct efct_scsi_sgl {
+ uintptr_t addr;
+ uintptr_t dif_addr;
+ size_t len;
+};
+
+/* Return values for calls from base driver to libefc */
+#define EFCT_SCSI_CALL_COMPLETE 0 /* All work is done */
+#define EFCT_SCSI_CALL_ASYNC 1 /* Work will be completed asynchronously */
+
+enum efct_scsi_io_role {
+ EFCT_SCSI_IO_ROLE_ORIGINATOR,
+ EFCT_SCSI_IO_ROLE_RESPONDER,
+};
+
+void efct_scsi_io_alloc_enable(struct efc *efc, struct efc_node *node);
+void efct_scsi_io_alloc_disable(struct efc *efc, struct efc_node *node);
+extern struct efct_io *
+efct_scsi_io_alloc(struct efc_node *node, enum efct_scsi_io_role);
+void efct_scsi_io_free(struct efct_io *io);
+struct efct_io *efct_io_get_instance(struct efct *efct, u32 index);
+
+int efct_scsi_tgt_driver_init(void);
+int efct_scsi_tgt_driver_exit(void);
+int efct_scsi_tgt_new_device(struct efct *efct);
+int efct_scsi_tgt_del_device(struct efct *efct);
+int
+efct_scsi_tgt_new_domain(struct efc *efc, struct efc_domain *domain);
+void
+efct_scsi_tgt_del_domain(struct efc *efc, struct efc_domain *domain);
+int
+efct_scsi_tgt_new_sport(struct efc *efc, struct efc_sli_port *sport);
+void
+efct_scsi_tgt_del_sport(struct efc *efc, struct efc_sli_port *sport);
+int
+efct_scsi_validate_initiator(struct efc *efc, struct efc_node *node);
+int
+efct_scsi_new_initiator(struct efc *efc, struct efc_node *node);
+
+enum efct_scsi_del_initiator_reason {
+ EFCT_SCSI_INITIATOR_DELETED,
+ EFCT_SCSI_INITIATOR_MISSING,
+};
+
+extern int
+efct_scsi_del_initiator(struct efc *efc, struct efc_node *node,
+ int reason);
+extern int
+efct_scsi_recv_cmd(struct efct_io *io, uint64_t lun, u8 *cdb,
+ u32 cdb_len, u32 flags);
+extern int
+efct_scsi_recv_tmf(struct efct_io *tmfio, u32 lun,
+ enum efct_scsi_tmf_cmd cmd, struct efct_io *abortio,
+ u32 flags);
+
+extern int
+efct_scsi_send_rd_data(struct efct_io *io, u32 flags,
+ struct efct_scsi_sgl *sgl, u32 sgl_count,
+ u64 wire_len, efct_scsi_io_cb_t cb, void *arg);
+extern int
+efct_scsi_recv_wr_data(struct efct_io *io, u32 flags,
+ struct efct_scsi_sgl *sgl, u32 sgl_count,
+ u64 wire_len, efct_scsi_io_cb_t cb, void *arg);
+extern int
+efct_scsi_send_resp(struct efct_io *io, u32 flags,
+ struct efct_scsi_cmd_resp *rsp, efct_scsi_io_cb_t cb,
+ void *arg);
+extern int
+efct_scsi_send_tmf_resp(struct efct_io *io,
+ enum efct_scsi_tmf_resp rspcode,
+ u8 addl_rsp_info[3],
+ efct_scsi_io_cb_t cb, void *arg);
+extern int
+efct_scsi_tgt_abort_io(struct efct_io *io, efct_scsi_io_cb_t cb, void *arg);
+
+void efct_scsi_io_complete(struct efct_io *io);
+
+int efct_scsi_reg_fc_transport(void);
+int efct_scsi_release_fc_transport(void);
+int efct_scsi_new_device(struct efct *efct);
+int efct_scsi_del_device(struct efct *efct);
+void _efct_scsi_io_free(struct kref *arg);
+
+int efct_scsi_send_tmf(struct efc_node *node,
+ struct efct_io *io,
+ struct efct_io *io_to_abort, u32 lun,
+ enum efct_scsi_tmf_cmd tmf,
+ struct efct_scsi_sgl *sgl,
+ u32 sgl_count, u32 len,
+ efct_scsi_rsp_io_cb_t cb, void *arg);
+
+extern int
+efct_scsi_del_vport(struct efct *efct, struct Scsi_Host *shost);
+extern struct efct_vport *
+efct_scsi_new_vport(struct efct *efct, struct device *dev);
+
+int efct_scsi_io_dispatch(struct efct_io *io, void *cb);
+int efct_scsi_io_dispatch_abort(struct efct_io *io, void *cb);
+void efct_scsi_check_pending(struct efct *efct);
+
+#endif /* __EFCT_SCSI_H__ */
--
2.16.4