Date:   Tue, 6 Dec 2022 16:44:34 -0800
From:   Shannon Nelson <shannon.nelson@....com>
To:     <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>
CC:     <drivers@...sando.io>, Shannon Nelson <shannon.nelson@....com>
Subject: [PATCH v2 net-next 07/16] pds_core: Add adminq processing and commands

Add the service routines for submitting and processing
the adminq messages and for handling notifyq events.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 .../net/ethernet/pensando/pds_core/Makefile   |   1 +
 .../net/ethernet/pensando/pds_core/adminq.c   | 282 ++++++++++++++++++
 drivers/net/ethernet/pensando/pds_core/core.c |  11 -
 drivers/net/ethernet/pensando/pds_core/core.h |   6 +
 include/linux/pds/pds_adminq.h                |   2 +
 5 files changed, 291 insertions(+), 11 deletions(-)
 create mode 100644 drivers/net/ethernet/pensando/pds_core/adminq.c

diff --git a/drivers/net/ethernet/pensando/pds_core/Makefile b/drivers/net/ethernet/pensando/pds_core/Makefile
index 446054206b6a..c7a722f7d9b8 100644
--- a/drivers/net/ethernet/pensando/pds_core/Makefile
+++ b/drivers/net/ethernet/pensando/pds_core/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_PDS_CORE) := pds_core.o
 pds_core-y := main.o \
 	      devlink.o \
 	      dev.o \
+	      adminq.o \
 	      core.o
 
 pds_core-$(CONFIG_DEBUG_FS) += debugfs.o
diff --git a/drivers/net/ethernet/pensando/pds_core/adminq.c b/drivers/net/ethernet/pensando/pds_core/adminq.c
new file mode 100644
index 000000000000..ba9e84a7ca92
--- /dev/null
+++ b/drivers/net/ethernet/pensando/pds_core/adminq.c
@@ -0,0 +1,282 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2022 Pensando Systems, Inc */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+
+#include "core.h"
+
+#include <linux/pds/pds_adminq.h>
+
+struct pdsc_wait_context {
+	struct pdsc_qcq *qcq;
+	struct completion wait_completion;
+};
+
+static int pdsc_process_notifyq(struct pdsc_qcq *qcq)
+{
+	union pds_core_notifyq_comp *comp;
+	struct pdsc *pdsc = qcq->pdsc;
+	struct pdsc_cq *cq = &qcq->cq;
+	struct pdsc_cq_info *cq_info;
+	int nq_work = 0;
+	u64 eid;
+
+	cq_info = &cq->info[cq->tail_idx];
+	comp = cq_info->comp;
+	eid = le64_to_cpu(comp->event.eid);
+	while (eid > pdsc->last_eid) {
+		u16 ecode = le16_to_cpu(comp->event.ecode);
+
+		switch (ecode) {
+		case PDS_EVENT_LINK_CHANGE:
+			dev_info(pdsc->dev, "NotifyQ LINK_CHANGE ecode %d eid %lld\n",
+				 ecode, eid);
+			break;
+
+		case PDS_EVENT_RESET:
+			dev_info(pdsc->dev, "NotifyQ RESET ecode %d eid %lld\n",
+				 ecode, eid);
+			break;
+
+		case PDS_EVENT_XCVR:
+			dev_info(pdsc->dev, "NotifyQ XCVR ecode %d eid %lld\n",
+				 ecode, eid);
+			break;
+
+		default:
+			dev_info(pdsc->dev, "NotifyQ ecode %d eid %lld\n",
+				 ecode, eid);
+			break;
+		}
+
+		pdsc->last_eid = eid;
+		cq->tail_idx = (cq->tail_idx + 1) & (cq->num_descs - 1);
+		cq_info = &cq->info[cq->tail_idx];
+		comp = cq_info->comp;
+		eid = le64_to_cpu(comp->event.eid);
+
+		nq_work++;
+	}
+
+	qcq->accum_work += nq_work;
+
+	return nq_work;
+}
+
+void pdsc_process_adminq(struct pdsc_qcq *qcq)
+{
+	union pds_core_adminq_comp *comp;
+	struct pdsc_queue *q = &qcq->q;
+	struct pdsc *pdsc = qcq->pdsc;
+	struct pdsc_cq *cq = &qcq->cq;
+	struct pdsc_q_info *q_info;
+	unsigned long irqflags;
+	int nq_work = 0;
+	int aq_work = 0;
+	int credits;
+	u32 index;
+
+	/* Check for NotifyQ event */
+	nq_work = pdsc_process_notifyq(&pdsc->notifyqcq);
+
+	/* Check for empty queue, which can happen if the interrupt was
+	 * for a NotifyQ event and there are no new AdminQ completions.
+	 */
+	if (q->tail_idx == q->head_idx)
+		goto credits;
+
+	/* Find the first completion to clean,
+	 * run the callback in the related q_info,
+	 * and continue while we still match done color
+	 */
+	spin_lock_irqsave(&pdsc->adminq_lock, irqflags);
+	comp = cq->info[cq->tail_idx].comp;
+	while (pdsc_color_match(comp->color, cq->done_color)) {
+		q_info = &q->info[q->tail_idx];
+		index = q->tail_idx;
+		q->tail_idx = (q->tail_idx + 1) & (q->num_descs - 1);
+
+		/* Copy out the completion data */
+		memcpy(q_info->dest, comp, sizeof(*comp));
+
+		complete_all(&q_info->wc->wait_completion);
+
+		if (cq->tail_idx == cq->num_descs - 1)
+			cq->done_color = !cq->done_color;
+		cq->tail_idx = (cq->tail_idx + 1) & (cq->num_descs - 1);
+		comp = cq->info[cq->tail_idx].comp;
+
+		aq_work++;
+	}
+	spin_unlock_irqrestore(&pdsc->adminq_lock, irqflags);
+
+	qcq->accum_work += aq_work;
+
+credits:
+	/* Return the interrupt credits, one for each completion */
+	credits = nq_work + aq_work;
+	if (credits)
+		pds_core_intr_credits(&pdsc->intr_ctrl[qcq->intx],
+				      credits,
+				      PDS_CORE_INTR_CRED_REARM);
+}
+
+void pdsc_work_thread(struct work_struct *work)
+{
+	struct pdsc_qcq *qcq = container_of(work, struct pdsc_qcq, work);
+
+	pdsc_process_adminq(qcq);
+}
+
+irqreturn_t pdsc_adminq_isr(int irq, void *data)
+{
+	struct pdsc_qcq *qcq = data;
+	struct pdsc *pdsc = qcq->pdsc;
+
+	/* Don't process AdminQ when shutting down */
+	if (pdsc->state & BIT_ULL(PDSC_S_STOPPING_DRIVER)) {
+		pr_err("%s: called while PDSC_S_STOPPING_DRIVER\n", __func__);
+		return IRQ_HANDLED;
+	}
+
+	queue_work(pdsc->wq, &qcq->work);
+	pds_core_intr_mask(&pdsc->intr_ctrl[irq], PDS_CORE_INTR_MASK_CLEAR);
+
+	return IRQ_HANDLED;
+}
+
+static int __pdsc_adminq_post(struct pdsc *pdsc,
+			      struct pdsc_qcq *qcq,
+			      union pds_core_adminq_cmd *cmd,
+			      union pds_core_adminq_comp *comp,
+			      struct pdsc_wait_context *wc)
+{
+	struct pdsc_queue *q = &qcq->q;
+	struct pdsc_q_info *q_info;
+	unsigned long irqflags;
+	unsigned int avail;
+	int ret = 0;
+	int index;
+
+	spin_lock_irqsave(&pdsc->adminq_lock, irqflags);
+
+	/* Check for space in the queue */
+	avail = q->tail_idx;
+	if (q->head_idx >= avail)
+		avail += q->num_descs - q->head_idx - 1;
+	else
+		avail -= q->head_idx + 1;
+	if (!avail) {
+		ret = -ENOSPC;
+		goto err_out;
+	}
+
+	/* Check that the FW is running */
+	if (!pdsc_is_fw_running(pdsc)) {
+		u8 fw_status = ioread8(&pdsc->info_regs->fw_status);
+
+		dev_info(pdsc->dev, "%s: post failed - fw not running %#02x:\n",
+			 __func__, fw_status);
+		ret = -ENXIO;
+
+		goto err_out;
+	}
+
+	/* Post the request */
+	index = q->head_idx;
+	q_info = &q->info[index];
+	q_info->wc = wc;
+	q_info->dest = comp;
+	memcpy(q_info->desc, cmd, sizeof(*cmd));
+
+	dev_dbg(pdsc->dev, "head_idx %d tail_idx %d\n", q->head_idx, q->tail_idx);
+	dev_dbg(pdsc->dev, "post admin queue command:\n");
+	dynamic_hex_dump("cmd ", DUMP_PREFIX_OFFSET, 16, 1,
+			 cmd, sizeof(*cmd), true);
+
+	q->head_idx = (q->head_idx + 1) & (q->num_descs - 1);
+
+	pds_core_dbell_ring(pdsc->kern_dbpage, q->hw_type, q->dbval | q->head_idx);
+	ret = index;
+
+err_out:
+	spin_unlock_irqrestore(&pdsc->adminq_lock, irqflags);
+	return ret;
+}
+
+int pdsc_adminq_post(struct pdsc *pdsc,
+		     struct pdsc_qcq *qcq,
+		     union pds_core_adminq_cmd *cmd,
+		     union pds_core_adminq_comp *comp,
+		     bool fast_poll)
+{
+	struct pdsc_wait_context wc = {
+		.wait_completion = COMPLETION_INITIALIZER_ONSTACK(wc.wait_completion),
+		.qcq = qcq,
+	};
+	unsigned long poll_interval = 1;
+	unsigned long time_limit;
+	unsigned long time_start;
+	unsigned long time_done;
+	unsigned long remaining;
+	int err = 0;
+	int index;
+
+	index = __pdsc_adminq_post(pdsc, qcq, cmd, comp, &wc);
+	if (index < 0) {
+		err = index;
+		goto out;
+	}
+
+	time_start = jiffies;
+	time_limit = time_start + HZ * pdsc->devcmd_timeout;
+	do {
+		/* Timeslice the actual wait to catch IO errors etc early */
+		remaining = wait_for_completion_timeout(&wc.wait_completion,
+							msecs_to_jiffies(poll_interval));
+		if (remaining)
+			break;
+
+		if (!pdsc_is_fw_running(pdsc)) {
+			u8 fw_status = ioread8(&pdsc->info_regs->fw_status);
+
+			dev_dbg(pdsc->dev, "%s: post wait failed - fw not running %#02x:\n",
+				__func__, fw_status);
+			err = -ENXIO;
+			break;
+		}
+
+		/* When fast_poll is not requested, prevent aggressive polling
+		 * on failures due to timeouts by doing exponential back off.
+		 */
+		if (!fast_poll && poll_interval < PDSC_ADMINQ_MAX_POLL_INTERVAL)
+			poll_interval <<= 1;
+	} while (time_before(jiffies, time_limit));
+	time_done = jiffies;
+	dev_dbg(pdsc->dev, "%s: elapsed %d msecs\n",
+		__func__, jiffies_to_msecs(time_done - time_start));
+
+	/* Check the results */
+	if (time_after_eq(time_done, time_limit))
+		err = -ETIMEDOUT;
+
+	dev_dbg(pdsc->dev, "read admin queue completion idx %d:\n", index);
+	dynamic_hex_dump("comp ", DUMP_PREFIX_OFFSET, 16, 1,
+			 comp, sizeof(*comp), true);
+
+	if (remaining && comp->status)
+		err = pdsc_err_to_errno(comp->status);
+
+out:
+	if (err) {
+		dev_dbg(pdsc->dev, "%s: opcode %d status %d err %pe\n",
+			__func__, cmd->opcode, comp->status, ERR_PTR(err));
+		if (err == -ENXIO || err == -ETIMEDOUT)
+			pdsc_queue_health_check(pdsc);
+	}
+
+	return err;
+}
diff --git a/drivers/net/ethernet/pensando/pds_core/core.c b/drivers/net/ethernet/pensando/pds_core/core.c
index 507f718bc8ab..e2017cee8284 100644
--- a/drivers/net/ethernet/pensando/pds_core/core.c
+++ b/drivers/net/ethernet/pensando/pds_core/core.c
@@ -12,17 +12,6 @@
 
 #include <linux/pds/pds_adminq.h>
 
-void pdsc_work_thread(struct work_struct *work)
-{
-	/* stub */
-}
-
-irqreturn_t pdsc_adminq_isr(int irq, void *data)
-{
-	/* stub */
-	return IRQ_HANDLED;
-}
-
 void pdsc_intr_free(struct pdsc *pdsc, int index)
 {
 	struct pdsc_intr_info *intr_info;
diff --git a/drivers/net/ethernet/pensando/pds_core/core.h b/drivers/net/ethernet/pensando/pds_core/core.h
index 3d1023f0eeb2..bdb3a29d789e 100644
--- a/drivers/net/ethernet/pensando/pds_core/core.h
+++ b/drivers/net/ethernet/pensando/pds_core/core.h
@@ -260,6 +260,12 @@ int pdsc_devcmd_reset(struct pdsc *pdsc);
 int pdsc_dev_reinit(struct pdsc *pdsc);
 int pdsc_dev_init(struct pdsc *pdsc);
 
+int pdsc_adminq_post(struct pdsc *pdsc,
+		     struct pdsc_qcq *qcq,
+		     union pds_core_adminq_cmd *cmd,
+		     union pds_core_adminq_comp *comp,
+		     bool fast_poll);
+
 int pdsc_intr_alloc(struct pdsc *pdsc, char *name,
 		    irq_handler_t handler, void *data);
 void pdsc_intr_free(struct pdsc *pdsc, int index);
diff --git a/include/linux/pds/pds_adminq.h b/include/linux/pds/pds_adminq.h
index b06d28d0f906..19070099eb35 100644
--- a/include/linux/pds/pds_adminq.h
+++ b/include/linux/pds/pds_adminq.h
@@ -4,6 +4,8 @@
 #ifndef _PDS_CORE_ADMINQ_H_
 #define _PDS_CORE_ADMINQ_H_
 
+#define PDSC_ADMINQ_MAX_POLL_INTERVAL	256
+
 enum pds_core_adminq_flags {
 	PDS_AQ_FLAG_FASTPOLL	= BIT(1),	/* poll for completion at 1ms intervals */
 };
-- 
2.17.1

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