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Subject[PATCH 02/22] NTB: Add peer indexed ports NTB API
Date
Add new port-index NTB API. Additionally lets get rid of Primary and
Secondary topologies, since port-number can be effectively used instead.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>

---
include/linux/ntb.h | 101 ++++++++++++++++++++++++++++++++++++++++------------
1 file changed, 79 insertions(+), 22 deletions(-)

diff --git a/include/linux/ntb.h b/include/linux/ntb.h
index 5d1f260..0941a43 100644
--- a/include/linux/ntb.h
+++ b/include/linux/ntb.h
@@ -64,37 +64,21 @@ struct pci_dev;
/**
* enum ntb_topo - NTB connection topology
* @NTB_TOPO_NONE: Topology is unknown or invalid.
- * @NTB_TOPO_PRI: On primary side of local ntb.
- * @NTB_TOPO_SEC: On secondary side of remote ntb.
- * @NTB_TOPO_B2B_USD: On primary side of local ntb upstream of remote ntb.
- * @NTB_TOPO_B2B_DSD: On primary side of local ntb downstream of remote ntb.
+ * @NTB_TOPO_P2P: Simple port-to-port NTB topology
+ * @NTB_TOPO_B2B: Bridge-to-bridge NTB topology
*/
enum ntb_topo {
NTB_TOPO_NONE = -1,
- NTB_TOPO_PRI,
- NTB_TOPO_SEC,
- NTB_TOPO_B2B_USD,
- NTB_TOPO_B2B_DSD,
+ NTB_TOPO_P2P,
+ NTB_TOPO_B2B
};

-static inline int ntb_topo_is_b2b(enum ntb_topo topo)
-{
- switch ((int)topo) {
- case NTB_TOPO_B2B_USD:
- case NTB_TOPO_B2B_DSD:
- return 1;
- }
- return 0;
-}
-
static inline char *ntb_topo_string(enum ntb_topo topo)
{
switch (topo) {
case NTB_TOPO_NONE: return "NTB_TOPO_NONE";
- case NTB_TOPO_PRI: return "NTB_TOPO_PRI";
- case NTB_TOPO_SEC: return "NTB_TOPO_SEC";
- case NTB_TOPO_B2B_USD: return "NTB_TOPO_B2B_USD";
- case NTB_TOPO_B2B_DSD: return "NTB_TOPO_B2B_DSD";
+ case NTB_TOPO_P2P: return "NTB_TOPO_P2P";
+ case NTB_TOPO_B2B: return "NTB_TOPO_B2B";
}
return "NTB_TOPO_INVALID";
}
@@ -179,6 +163,10 @@ static inline int ntb_ctx_ops_is_valid(const struct ntb_ctx_ops *ops)

/**
* struct ntb_ctx_ops - ntb device operations
+ * @port_number: See ntb_port_number().
+ * @peer_port_count: See ntb_peer_port_count().
+ * @peer_port_number: See ntb_peer_port_number().
+ * @peer_port_idx: See ntb_peer_port_idx().
* @link_is_up: See ntb_link_is_up().
* @link_enable: See ntb_link_enable().
* @link_disable: See ntb_link_disable().
@@ -212,6 +200,11 @@ static inline int ntb_ctx_ops_is_valid(const struct ntb_ctx_ops *ops)
* @peer_spad_write: See ntb_peer_spad_write().
*/
struct ntb_dev_ops {
+ int (*port_number)(struct ntb_dev *ntb);
+ int (*peer_port_count)(struct ntb_dev *ntb);
+ int (*peer_port_number)(struct ntb_dev *ntb, int pidx);
+ int (*peer_port_idx)(struct ntb_dev *ntb, int port);
+
int (*link_is_up)(struct ntb_dev *ntb,
enum ntb_speed *speed, enum ntb_width *width);
int (*link_enable)(struct ntb_dev *ntb,
@@ -265,6 +258,10 @@ static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops)
{
/* commented callbacks are not required: */
return
+ ops->port_number &&
+ ops->peer_port_count &&
+ ops->peer_port_number &&
+ ops->peer_port_idx &&
ops->link_is_up &&
ops->link_enable &&
ops->link_disable &&
@@ -319,6 +316,7 @@ struct ntb_client {
* @dev: Linux device object.
* @pdev: Pci device entry of the ntb.
* @topo: Detected topology of the ntb.
+ * @port: Local port of the ntb.
* @ops: See &ntb_dev_ops.
* @ctx: See &ntb_ctx_ops.
* @ctx_ops: See &ntb_ctx_ops.
@@ -327,6 +325,7 @@ struct ntb_dev {
struct device dev;
struct pci_dev *pdev;
enum ntb_topo topo;
+ int port;
const struct ntb_dev_ops *ops;
void *ctx;
const struct ntb_ctx_ops *ctx_ops;
@@ -442,6 +441,64 @@ void ntb_link_event(struct ntb_dev *ntb);
void ntb_db_event(struct ntb_dev *ntb, int vector);

/**
+ * ntb_port_number() - get the local port number
+ * @ntb: NTB device context.
+ *
+ * Hardware must support at least simple two-ports topology
+ *
+ * Return: the local port number
+ */
+static inline int ntb_port_number(struct ntb_dev *ntb)
+{
+ return ntb->ops->port_number(ntb);
+}
+
+/**
+ * ntb_peer_port_count() - get the number of peer device ports
+ * @ntb: NTB device context.
+ *
+ * Hardware may support an access to memory of several remote domains
+ * over multi-port NTB devices. This method returns the number of peers,
+ * local device can have shared memory with.
+ *
+ * Return: the number of peer ports
+ */
+static inline int ntb_peer_port_count(struct ntb_dev *ntb)
+{
+ return ntb->ops->peer_port_count(ntb);
+}
+
+/**
+ * ntb_peer_port_number() - get the peer port by given index
+ * @ntb: NTB device context.
+ * @pidx: Peer port index.
+ *
+ * Peer ports are continuously enumerated by NTB API logic, so this methods
+ * lets to retrieve port real number by its index.
+ *
+ * Return: the peer device port or negative value indicating an error
+ */
+static inline int ntb_peer_port_number(struct ntb_dev *ntb, int pidx)
+{
+ return ntb->ops->peer_port_number(ntb, pidx);
+}
+
+/**
+ * ntb_peer_port_idx() - get the peer device port index by given port number
+ * @ntb: NTB device context.
+ * @port: Peer port number.
+ *
+ * Inverse operation of ntb_peer_port_number(), so one can get port index
+ * by its port number.
+ *
+ * Return: the peer port index or negative value indicating an error
+ */
+static inline int ntb_peer_port_idx(struct ntb_dev *ntb, int port)
+{
+ return ntb->ops->peer_port_idx(ntb, port);
+}
+
+/**
* ntb_link_is_up() - get the current ntb link state
* @ntb: NTB device context.
* @speed: OUT - The link speed expressed as PCIe generation number.
--
2.6.6
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