From c67719e133f767451b16d6c13bd857bc09d0a2a9 Mon Sep 17 00:00:00 2001
From: Alfredo Cardigliano <cardigliano@ntop.org>
Date: Sun, 19 Jan 2020 16:53:45 +0100
Subject: [PATCH] net/ionic: add doorbells

Doorbell registers are used by the driver to signal to the NIC
that requests are waiting on the message queues.

Signed-off-by: Alfredo Cardigliano <cardigliano@ntop.org>
Reviewed-by: Shannon Nelson <snelson@pensando.io>
---
 drivers/net/ionic/ionic_dev.c | 15 +++++++++++++++
 drivers/net/ionic/ionic_dev.h | 18 ++++++++++++++++++
 drivers/net/ionic/ionic_lif.c | 23 +++++++++++++++++++++++
 drivers/net/ionic/ionic_lif.h |  2 ++
 4 files changed, 58 insertions(+)

diff --git a/drivers/net/ionic/ionic_dev.c b/drivers/net/ionic/ionic_dev.c
index c63709ee8b..13e99ace62 100644
--- a/drivers/net/ionic/ionic_dev.c
+++ b/drivers/net/ionic/ionic_dev.c
@@ -5,6 +5,7 @@
 #include <rte_malloc.h>
 
 #include "ionic_dev.h"
+#include "ionic_lif.h"
 #include "ionic.h"
 
 int
@@ -297,3 +298,17 @@ ionic_dev_cmd_lif_reset(struct ionic_dev *idev, uint16_t lif_index)
 
 	ionic_dev_cmd_go(idev, &cmd);
 }
+
+int
+ionic_db_page_num(struct ionic_lif *lif, int pid)
+{
+	return (lif->index * 0) + pid;
+}
+
+void
+ionic_intr_init(struct ionic_dev *idev, struct ionic_intr_info *intr,
+		unsigned long index)
+{
+	ionic_intr_clean(idev->intr_ctrl, index);
+	intr->index = index;
+}
diff --git a/drivers/net/ionic/ionic_dev.h b/drivers/net/ionic/ionic_dev.h
index afcfcbf567..d6f0669c3c 100644
--- a/drivers/net/ionic/ionic_dev.h
+++ b/drivers/net/ionic/ionic_dev.h
@@ -121,6 +121,22 @@ struct ionic_dev {
 	uint32_t port_info_sz;
 };
 
+#define IONIC_INTR_INDEX_NOT_ASSIGNED	(-1)
+#define IONIC_INTR_NAME_MAX_SZ		(32)
+
+struct ionic_intr_info {
+	char name[IONIC_INTR_NAME_MAX_SZ];
+	int index;
+	uint32_t vector;
+	struct ionic_intr __iomem *ctrl;
+};
+
+struct ionic_lif;
+struct ionic_adapter;
+
+void ionic_intr_init(struct ionic_dev *idev, struct ionic_intr_info *intr,
+	unsigned long index);
+
 int ionic_dev_setup(struct ionic_adapter *adapter);
 
 void ionic_dev_cmd_go(struct ionic_dev *idev, union ionic_dev_cmd *cmd);
@@ -150,4 +166,6 @@ void ionic_dev_cmd_lif_init(struct ionic_dev *idev, uint16_t lif_index,
 	rte_iova_t addr);
 void ionic_dev_cmd_lif_reset(struct ionic_dev *idev, uint16_t lif_index);
 
+int ionic_db_page_num(struct ionic_lif *lif, int pid);
+
 #endif /* _IONIC_DEV_H_ */
diff --git a/drivers/net/ionic/ionic_lif.c b/drivers/net/ionic/ionic_lif.c
index 2559b4c16e..9cdab32501 100644
--- a/drivers/net/ionic/ionic_lif.c
+++ b/drivers/net/ionic/ionic_lif.c
@@ -10,15 +10,38 @@
 #include "ionic_lif.h"
 #include "ionic_ethdev.h"
 
+static void *
+ionic_bus_map_dbpage(struct ionic_adapter *adapter, int page_num)
+{
+	char *vaddr = adapter->bars[IONIC_PCI_BAR_DBELL].vaddr;
+
+	if (adapter->num_bars <= IONIC_PCI_BAR_DBELL)
+		return NULL;
+
+	return (void *)&vaddr[page_num << PAGE_SHIFT];
+}
+
 int
 ionic_lif_alloc(struct ionic_lif *lif)
 {
+	struct ionic_adapter *adapter = lif->adapter;
 	uint32_t socket_id = rte_socket_id();
+	int dbpage_num;
 
 	snprintf(lif->name, sizeof(lif->name), "lif%u", lif->index);
 
 	IONIC_PRINT(DEBUG, "Allocating Lif Info");
 
+	lif->kern_pid = 0;
+
+	dbpage_num = ionic_db_page_num(lif, 0);
+
+	lif->kern_dbpage = ionic_bus_map_dbpage(adapter, dbpage_num);
+	if (!lif->kern_dbpage) {
+		IONIC_PRINT(ERR, "Cannot map dbpage, aborting");
+		return -ENOMEM;
+	}
+
 	lif->info_sz = RTE_ALIGN(sizeof(*lif->info), PAGE_SIZE);
 
 	lif->info_z = rte_eth_dma_zone_reserve(lif->eth_dev,
diff --git a/drivers/net/ionic/ionic_lif.h b/drivers/net/ionic/ionic_lif.h
index a75e420c64..6e3233d1d6 100644
--- a/drivers/net/ionic/ionic_lif.h
+++ b/drivers/net/ionic/ionic_lif.h
@@ -24,6 +24,8 @@ struct ionic_lif {
 	uint32_t index;
 	uint32_t hw_index;
 	uint32_t state;
+	uint32_t kern_pid;
+	struct ionic_doorbell __iomem *kern_dbpage;
 	char name[IONIC_LIF_NAME_MAX_SZ];
 	uint32_t info_sz;
 	struct ionic_lif_info *info;
-- 
2.20.1