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Subject[PATCH v2 01/15] NTB: Rename NTB messaging API methods
Date
There is a common methods signature form used over all the NTB API
like functions naming scheme, arguments names and order, etc.
Recently added NTB messaging API IO callbacks were named a bit
different so should be renamed to be in compliance with the rest
of the API. The changes are made in a way so the developers won't
be able to compile their code without being informed by the compiler.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
---
drivers/ntb/hw/idt/ntb_hw_idt.c | 27 ++++++++++++---------------
include/linux/ntb.h | 34 ++++++++++++++++------------------
2 files changed, 28 insertions(+), 33 deletions(-)

diff --git a/drivers/ntb/hw/idt/ntb_hw_idt.c b/drivers/ntb/hw/idt/ntb_hw_idt.c
index 0cd79f367f7c..6fb87c0f0d97 100644
--- a/drivers/ntb/hw/idt/ntb_hw_idt.c
+++ b/drivers/ntb/hw/idt/ntb_hw_idt.c
@@ -1744,20 +1744,19 @@ static int idt_ntb_msg_clear_mask(struct ntb_dev *ntb, u64 mask_bits)
* idt_ntb_msg_read() - read message register with specified index
* (NTB API callback)
* @ntb: NTB device context.
- * @midx: Message register index
* @pidx: OUT - Port index of peer device a message retrieved from
- * @msg: OUT - Data
+ * @midx: Message register index
*
* Read data from the specified message register and source register.
*
- * Return: zero on success, negative error if invalid argument passed.
+ * Return: inbound message register value.
*/
-static int idt_ntb_msg_read(struct ntb_dev *ntb, int midx, int *pidx, u32 *msg)
+static u32 idt_ntb_msg_read(struct ntb_dev *ntb, int *pidx, int midx)
{
struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);

if (midx < 0 || IDT_MSG_CNT <= midx)
- return -EINVAL;
+ return (u32)-1;

/* Retrieve source port index of the message */
if (pidx != NULL) {
@@ -1772,18 +1771,15 @@ static int idt_ntb_msg_read(struct ntb_dev *ntb, int midx, int *pidx, u32 *msg)
}

/* Retrieve data of the corresponding message register */
- if (msg != NULL)
- *msg = idt_nt_read(ndev, ntdata_tbl.msgs[midx].in);
-
- return 0;
+ return idt_nt_read(ndev, ntdata_tbl.msgs[midx].in);
}

/*
- * idt_ntb_msg_write() - write data to the specified message register
- * (NTB API callback)
+ * idt_ntb_peer_msg_write() - write data to the specified message register
+ * (NTB API callback)
* @ntb: NTB device context.
- * @midx: Message register index
* @pidx: Port index of peer device a message being sent to
+ * @midx: Message register index
* @msg: Data to send
*
* Just try to send data to a peer. Message status register should be
@@ -1791,7 +1787,8 @@ static int idt_ntb_msg_read(struct ntb_dev *ntb, int midx, int *pidx, u32 *msg)
*
* Return: zero on success, negative error if invalid argument passed.
*/
-static int idt_ntb_msg_write(struct ntb_dev *ntb, int midx, int pidx, u32 msg)
+static int idt_ntb_peer_msg_write(struct ntb_dev *ntb, int pidx, int midx,
+ u32 msg)
{
struct idt_ntb_dev *ndev = to_ndev_ntb(ntb);
unsigned long irqflags;
@@ -2058,7 +2055,7 @@ static const struct ntb_dev_ops idt_ntb_ops = {
.msg_set_mask = idt_ntb_msg_set_mask,
.msg_clear_mask = idt_ntb_msg_clear_mask,
.msg_read = idt_ntb_msg_read,
- .msg_write = idt_ntb_msg_write
+ .peer_msg_write = idt_ntb_peer_msg_write
};

/*
@@ -2269,7 +2266,7 @@ static ssize_t idt_dbgfs_info_read(struct file *filp, char __user *ubuf,
"Message data:\n");
for (idx = 0; idx < IDT_MSG_CNT; idx++) {
int src;
- (void)idt_ntb_msg_read(&ndev->ntb, idx, &src, &data);
+ data = idt_ntb_msg_read(&ndev->ntb, &src, idx);
off += scnprintf(strbuf + off, size - off,
"\t%hhu. 0x%08x from peer %hhu (Port %hhu)\n",
idx, data, src, ndev->peers[src].port);
diff --git a/include/linux/ntb.h b/include/linux/ntb.h
index c308964777eb..c1646f2c6344 100644
--- a/include/linux/ntb.h
+++ b/include/linux/ntb.h
@@ -250,7 +250,7 @@ static inline int ntb_ctx_ops_is_valid(const struct ntb_ctx_ops *ops)
* @msg_set_mask: See ntb_msg_set_mask().
* @msg_clear_mask: See ntb_msg_clear_mask().
* @msg_read: See ntb_msg_read().
- * @msg_write: See ntb_msg_write().
+ * @peer_msg_write: See ntb_peer_msg_write().
*/
struct ntb_dev_ops {
int (*port_number)(struct ntb_dev *ntb);
@@ -321,8 +321,8 @@ struct ntb_dev_ops {
int (*msg_clear_sts)(struct ntb_dev *ntb, u64 sts_bits);
int (*msg_set_mask)(struct ntb_dev *ntb, u64 mask_bits);
int (*msg_clear_mask)(struct ntb_dev *ntb, u64 mask_bits);
- int (*msg_read)(struct ntb_dev *ntb, int midx, int *pidx, u32 *msg);
- int (*msg_write)(struct ntb_dev *ntb, int midx, int pidx, u32 msg);
+ u32 (*msg_read)(struct ntb_dev *ntb, int *pidx, int midx);
+ int (*peer_msg_write)(struct ntb_dev *ntb, int pidx, int midx, u32 msg);
};

static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops)
@@ -384,7 +384,7 @@ static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops)
/* !ops->msg_set_mask == !ops->msg_count && */
/* !ops->msg_clear_mask == !ops->msg_count && */
!ops->msg_read == !ops->msg_count &&
- !ops->msg_write == !ops->msg_count &&
+ !ops->peer_msg_write == !ops->msg_count &&
1;
}

@@ -1459,31 +1459,29 @@ static inline int ntb_msg_clear_mask(struct ntb_dev *ntb, u64 mask_bits)
}

/**
- * ntb_msg_read() - read message register with specified index
+ * ntb_msg_read() - read inbound message register with specified index
* @ntb: NTB device context.
- * @midx: Message register index
* @pidx: OUT - Port index of peer device a message retrieved from
- * @msg: OUT - Data
+ * @midx: Message register index
*
* Read data from the specified message register. Source port index of a
* message is retrieved as well.
*
- * Return: Zero on success, otherwise a negative error number.
+ * Return: The value of the inbound message register.
*/
-static inline int ntb_msg_read(struct ntb_dev *ntb, int midx, int *pidx,
- u32 *msg)
+static inline u32 ntb_msg_read(struct ntb_dev *ntb, int *pidx, int midx)
{
if (!ntb->ops->msg_read)
- return -EINVAL;
+ return ~(u32)0;

- return ntb->ops->msg_read(ntb, midx, pidx, msg);
+ return ntb->ops->msg_read(ntb, pidx, midx);
}

/**
- * ntb_msg_write() - write data to the specified message register
+ * ntb_peer_msg_write() - write data to the specified peer message register
* @ntb: NTB device context.
- * @midx: Message register index
* @pidx: Port index of peer device a message being sent to
+ * @midx: Message register index
* @msg: Data to send
*
* Send data to a specified peer device using the defined message register.
@@ -1492,13 +1490,13 @@ static inline int ntb_msg_read(struct ntb_dev *ntb, int midx, int *pidx,
*
* Return: Zero on success, otherwise a negative error number.
*/
-static inline int ntb_msg_write(struct ntb_dev *ntb, int midx, int pidx,
- u32 msg)
+static inline int ntb_peer_msg_write(struct ntb_dev *ntb, int pidx, int midx,
+ u32 msg)
{
- if (!ntb->ops->msg_write)
+ if (!ntb->ops->peer_msg_write)
return -EINVAL;

- return ntb->ops->msg_write(ntb, midx, pidx, msg);
+ return ntb->ops->peer_msg_write(ntb, pidx, midx, msg);
}

#endif
--
2.12.0
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