ionic: Add basic adminq support

Most of the NIC configuration happens through the AdminQ message
queue.  NAPI is used for basic interrupt handling and message
queue management.  These routines are set up to be shared among
different types of queues when used in slow-path handling.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 109 insertions, 0 deletions

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index 2252fa9ad0e3..86922dd26b72 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -126,6 +126,59 @@ struct ionic_dev {
 	struct ionic_devinfo dev_info;
 };
 
+struct ionic_cq_info {
+	void *cq_desc;
+	struct ionic_cq_info *next;
+	unsigned int index;
+	bool last;
+};
+
+struct ionic_queue;
+struct ionic_qcq;
+struct ionic_desc_info;
+
+typedef void (*ionic_desc_cb)(struct ionic_queue *q,
+			      struct ionic_desc_info *desc_info,
+			      struct ionic_cq_info *cq_info, void *cb_arg);
+
+struct ionic_desc_info {
+	void *desc;
+	void *sg_desc;
+	struct ionic_desc_info *next;
+	unsigned int index;
+	unsigned int left;
+	ionic_desc_cb cb;
+	void *cb_arg;
+};
+
+#define QUEUE_NAME_MAX_SZ		32
+
+struct ionic_queue {
+	u64 dbell_count;
+	u64 drop;
+	u64 stop;
+	u64 wake;
+	struct ionic_lif *lif;
+	struct ionic_desc_info *info;
+	struct ionic_desc_info *tail;
+	struct ionic_desc_info *head;
+	struct ionic_dev *idev;
+	unsigned int index;
+	unsigned int type;
+	unsigned int hw_index;
+	unsigned int hw_type;
+	u64 dbval;
+	void *base;
+	void *sg_base;
+	dma_addr_t base_pa;
+	dma_addr_t sg_base_pa;
+	unsigned int num_descs;
+	unsigned int desc_size;
+	unsigned int sg_desc_size;
+	unsigned int pid;
+	char name[QUEUE_NAME_MAX_SZ];
+};
+
 #define INTR_INDEX_NOT_ASSIGNED		-1
 #define INTR_NAME_MAX_SZ		32
 
@@ -138,6 +191,20 @@ struct ionic_intr_info {
 	cpumask_t affinity_mask;
 };
 
+struct ionic_cq {
+	void *base;
+	dma_addr_t base_pa;
+	struct ionic_lif *lif;
+	struct ionic_cq_info *info;
+	struct ionic_cq_info *tail;
+	struct ionic_queue *bound_q;
+	struct ionic_intr_info *bound_intr;
+	bool done_color;
+	unsigned int num_descs;
+	u64 compl_count;
+	unsigned int desc_size;
+};
+
 struct ionic;
 
 static inline void ionic_intr_init(struct ionic_dev *idev,
@@ -148,6 +215,23 @@ static inline void ionic_intr_init(struct ionic_dev *idev,
 	intr->index = index;
 }
 
+static inline unsigned int ionic_q_space_avail(struct ionic_queue *q)
+{
+	unsigned int avail = q->tail->index;
+
+	if (q->head->index >= avail)
+		avail += q->head->left - 1;
+	else
+		avail -= q->head->index + 1;
+
+	return avail;
+}
+
+static inline bool ionic_q_has_space(struct ionic_queue *q, unsigned int want)
+{
+	return ionic_q_space_avail(q) >= want;
+}
+
 void ionic_init_devinfo(struct ionic *ionic);
 int ionic_dev_setup(struct ionic *ionic);
 void ionic_dev_teardown(struct ionic *ionic);
@@ -174,7 +258,32 @@ void ionic_dev_cmd_lif_identify(struct ionic_dev *idev, u8 type, u8 ver);
 void ionic_dev_cmd_lif_init(struct ionic_dev *idev, u16 lif_index,
 			    dma_addr_t addr);
 void ionic_dev_cmd_lif_reset(struct ionic_dev *idev, u16 lif_index);
+void ionic_dev_cmd_adminq_init(struct ionic_dev *idev, struct ionic_qcq *qcq,
+			       u16 lif_index, u16 intr_index);
 
 int ionic_db_page_num(struct ionic_lif *lif, int pid);
 
+int ionic_cq_init(struct ionic_lif *lif, struct ionic_cq *cq,
+		  struct ionic_intr_info *intr,
+		  unsigned int num_descs, size_t desc_size);
+void ionic_cq_map(struct ionic_cq *cq, void *base, dma_addr_t base_pa);
+void ionic_cq_bind(struct ionic_cq *cq, struct ionic_queue *q);
+typedef bool (*ionic_cq_cb)(struct ionic_cq *cq, struct ionic_cq_info *cq_info);
+typedef void (*ionic_cq_done_cb)(void *done_arg);
+unsigned int ionic_cq_service(struct ionic_cq *cq, unsigned int work_to_do,
+			      ionic_cq_cb cb, ionic_cq_done_cb done_cb,
+			      void *done_arg);
+
+int ionic_q_init(struct ionic_lif *lif, struct ionic_dev *idev,
+		 struct ionic_queue *q, unsigned int index, const char *name,
+		 unsigned int num_descs, size_t desc_size,
+		 size_t sg_desc_size, unsigned int pid);
+void ionic_q_map(struct ionic_queue *q, void *base, dma_addr_t base_pa);
+void ionic_q_sg_map(struct ionic_queue *q, void *base, dma_addr_t base_pa);
+void ionic_q_post(struct ionic_queue *q, bool ring_doorbell, ionic_desc_cb cb,
+		  void *cb_arg);
+void ionic_q_rewind(struct ionic_queue *q, struct ionic_desc_info *start);
+void ionic_q_service(struct ionic_queue *q, struct ionic_cq_info *cq_info,
+		     unsigned int stop_index);
+
 #endif /* _IONIC_DEV_H_ */