[dpdk-dev] [PATCH v2 10/27] common/octeontx2: add AF to PF mailbox IRQ and msg handlers

[<jerinj@marvell.com>]

From: Nithin Dabilpuram <ndabilpuram@marvell.com>

This patch adds support for AF to PF mailbox interrupt and message
handling. PF writes the message on mapped mailbox region
followed by writing the mailbox doorbell register. Upon receiving,
the mailbox request in AF(In Linux kernel), It processes the messages
and update the counter memory and update the AF mbox doorbell
register. That would trigger a VFIO interrupt to userspace and
otx2_process_msgs() will handle it.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
---
 drivers/common/octeontx2/otx2_dev.c | 120 +++++++++++++++++++++++++++-
 1 file changed, 119 insertions(+), 1 deletion(-)

diff --git a/drivers/common/octeontx2/otx2_dev.c b/drivers/common/octeontx2/otx2_dev.c
index 59bd988d1..ba4fd9547 100644
--- a/drivers/common/octeontx2/otx2_dev.c
+++ b/drivers/common/octeontx2/otx2_dev.c
@@ -14,6 +14,9 @@
 #include "otx2_dev.h"
 #include "otx2_mbox.h"
 
+#define RVU_MAX_VF		64 /* RVU_PF_VFPF_MBOX_INT(0..1) */
+#define RVU_MAX_INT_RETRY	3
+
 /* PF/VF message handling timer */
 #define VF_PF_MBOX_TIMER_MS	(20 * 1000)
 
@@ -47,6 +50,108 @@ mbox_mem_unmap(void *va, size_t size)
 		munmap(va, size);
 }
 
+static void
+otx2_process_msgs(struct otx2_dev *dev, struct otx2_mbox *mbox)
+{
+	struct otx2_mbox_dev *mdev = &mbox->dev[0];
+	struct mbox_hdr *req_hdr;
+	struct mbox_msghdr *msg;
+	int msgs_acked = 0;
+	int offset;
+	uint16_t i;
+
+	req_hdr = (struct mbox_hdr *)((uintptr_t)mdev->mbase + mbox->rx_start);
+	if (req_hdr->num_msgs == 0)
+		return;
+
+	offset = mbox->rx_start + RTE_ALIGN(sizeof(*req_hdr), MBOX_MSG_ALIGN);
+	for (i = 0; i < req_hdr->num_msgs; i++) {
+		msg = (struct mbox_msghdr *)((uintptr_t)mdev->mbase + offset);
+
+		msgs_acked++;
+		otx2_base_dbg("Message 0x%x (%s) pf:%d/vf:%d",
+			      msg->id, otx2_mbox_id2name(msg->id),
+			      otx2_get_pf(msg->pcifunc),
+			      otx2_get_vf(msg->pcifunc));
+
+		switch (msg->id) {
+			/* Add message id's that are handled here */
+		case MBOX_MSG_READY:
+			/* Get our identity */
+			dev->pf_func = msg->pcifunc;
+			break;
+
+		default:
+			if (msg->rc)
+				otx2_err("Message (%s) response has err=%d",
+					 otx2_mbox_id2name(msg->id), msg->rc);
+			break;
+		}
+		offset = mbox->rx_start + msg->next_msgoff;
+	}
+
+	otx2_mbox_reset(mbox, 0);
+	/* Update acked if someone is waiting a message */
+	mdev->msgs_acked = msgs_acked;
+	rte_wmb();
+}
+
+static void
+otx2_af_pf_mbox_irq(void *param)
+{
+	struct otx2_dev *dev = param;
+	uint64_t intr;
+
+	intr = otx2_read64(dev->bar2 + RVU_PF_INT);
+	if (intr == 0)
+		return;
+
+	otx2_write64(intr, dev->bar2 + RVU_PF_INT);
+
+	otx2_base_dbg("Irq 0x%" PRIx64 "(pf:%d,vf:%d)", intr, dev->pf, dev->vf);
+	if (intr)
+		/* First process all configuration messages */
+		otx2_process_msgs(dev, dev->mbox);
+}
+
+static int
+mbox_register_irq(struct rte_pci_device *pci_dev, struct otx2_dev *dev)
+{
+	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
+	int rc;
+
+	otx2_write64(~0ull, dev->bar2 + RVU_PF_INT_ENA_W1C);
+
+	dev->timer_set = 0;
+
+	/* MBOX interrupt AF <-> PF */
+	rc = otx2_register_irq(intr_handle, otx2_af_pf_mbox_irq,
+			       dev, RVU_PF_INT_VEC_AFPF_MBOX);
+	if (rc) {
+		otx2_err("Fail to register AF<->PF mbox irq");
+		return rc;
+	}
+
+	otx2_write64(~0ull, dev->bar2 + RVU_PF_INT);
+	otx2_write64(~0ull, dev->bar2 + RVU_PF_INT_ENA_W1S);
+
+	return rc;
+}
+
+static void
+mbox_unregister_irq(struct rte_pci_device *pci_dev, struct otx2_dev *dev)
+{
+	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
+
+	otx2_write64(~0ull, dev->bar2 + RVU_PF_INT_ENA_W1C);
+
+	dev->timer_set = 0;
+
+	/* MBOX interrupt AF <-> PF */
+	otx2_unregister_irq(intr_handle, otx2_af_pf_mbox_irq, dev,
+			    RVU_PF_INT_VEC_AFPF_MBOX);
+}
+
 static void
 otx2_update_pass_hwcap(struct rte_pci_device *pci_dev, struct otx2_dev *dev)
 {
@@ -120,10 +225,15 @@ otx2_dev_init(struct rte_pci_device *pci_dev, void *otx2_dev)
 	if (rc)
 		goto error;
 
+	/* Register mbox interrupts */
+	rc = mbox_register_irq(pci_dev, dev);
+	if (rc)
+		goto mbox_fini;
+
 	/* Check the readiness of PF/VF */
 	rc = otx2_send_ready_msg(dev->mbox, &dev->pf_func);
 	if (rc)
-		goto mbox_fini;
+		goto mbox_unregister;
 
 	dev->pf = otx2_get_pf(dev->pf_func);
 	dev->vf = otx2_get_vf(dev->pf_func);
@@ -162,6 +272,8 @@ otx2_dev_init(struct rte_pci_device *pci_dev, void *otx2_dev)
 
 iounmap:
 	mbox_mem_unmap(hwbase, MBOX_SIZE * pci_dev->max_vfs);
+mbox_unregister:
+	mbox_unregister_irq(pci_dev, dev);
 mbox_fini:
 	otx2_mbox_fini(dev->mbox);
 	otx2_mbox_fini(&dev->mbox_up);
@@ -176,6 +288,7 @@ otx2_dev_init(struct rte_pci_device *pci_dev, void *otx2_dev)
 void
 otx2_dev_fini(struct rte_pci_device *pci_dev, void *otx2_dev)
 {
+	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
 	struct otx2_dev *dev = otx2_dev;
 	struct otx2_idev_cfg *idev;
 	struct otx2_mbox *mbox;
@@ -185,6 +298,8 @@ otx2_dev_fini(struct rte_pci_device *pci_dev, void *otx2_dev)
 	if (idev->npa_lf && idev->npa_lf->pci_dev == pci_dev)
 		idev->npa_lf = NULL;
 
+	mbox_unregister_irq(pci_dev, dev);
+
 	/* Release PF - VF */
 	mbox = &dev->mbox_vfpf;
 	if (mbox->hwbase && mbox->dev)
@@ -200,4 +315,7 @@ otx2_dev_fini(struct rte_pci_device *pci_dev, void *otx2_dev)
 	mbox = &dev->mbox_up;
 	otx2_mbox_fini(mbox);
 	dev->mbox_active = 0;
+
+	/* Disable MSIX vectors */
+	otx2_disable_irqs(intr_handle);
 }
-- 
2.21.0