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sparc64: expand LDC interface 

Add the following LDC APIs which are planned to be used by
LDC clients in the future:
- ldc_set_state: Sets given LDC channel to given state
- ldc_mode: Returns the mode of given LDC channel
- ldc_print: Prints info about given LDC channel
- ldc_rx_reset: Reset the RX queue of given LDC channel

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jag Raman 2017-06-09 12:29:28 -04:00 committed by David S. Miller
parent 95c4629d92
commit 85762a65c1
2 changed files with 42 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/sparc/include/asm/ldc.h
View File

@ -48,6 +48,8 @@ struct ldc_channel_config {
#define LDC_STATE_READY 0x03
#define LDC_STATE_CONNECTED 0x04
#define LDC_PACKET_SIZE 64
struct ldc_channel;
/* Allocate state for a channel. */
@ -72,6 +74,12 @@ int ldc_connect(struct ldc_channel *lp);
int ldc_disconnect(struct ldc_channel *lp);
int ldc_state(struct ldc_channel *lp);
void ldc_set_state(struct ldc_channel *lp, u8 state);
int ldc_mode(struct ldc_channel *lp);
void __ldc_print(struct ldc_channel *lp, const char *caller);
int ldc_rx_reset(struct ldc_channel *lp);
#define ldc_print(chan) __ldc_print(chan, __func__)
/* Read and write operations. Only valid when the link is up. */
int ldc_write(struct ldc_channel *lp, const void *buf,

46
arch/sparc/kernel/ldc.c
View File

@ -34,7 +34,6 @@
static char version[] =
DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
#define LDC_PACKET_SIZE 64
/* Packet header layout for unreliable and reliable mode frames.
* When in RAW mode, packets are simply straight 64-byte payloads
@ -196,15 +195,6 @@ static const char *state_to_str(u8 state)
}
}
static void ldc_set_state(struct ldc_channel *lp, u8 state)
{
ldcdbg(STATE, "STATE (%s) --> (%s)\n",
state_to_str(lp->state),
state_to_str(state));
lp->state = state;
}
static unsigned long __advance(unsigned long off, unsigned long num_entries)
{
off += LDC_PACKET_SIZE;
@ -829,7 +819,7 @@ static irqreturn_t ldc_rx(int irq, void *dev_id)
* everything.
*/
if (lp->flags & LDC_FLAG_RESET) {
(void) __set_rx_head(lp, lp->rx_tail);
(void) ldc_rx_reset(lp);
goto out;
}
@ -1447,6 +1437,38 @@ int ldc_state(struct ldc_channel *lp)
}
EXPORT_SYMBOL(ldc_state);
void ldc_set_state(struct ldc_channel *lp, u8 state)
{
ldcdbg(STATE, "STATE (%s) --> (%s)\n",
state_to_str(lp->state),
state_to_str(state));
lp->state = state;
}
int ldc_mode(struct ldc_channel *lp)
{
return lp->cfg.mode;
}
int ldc_rx_reset(struct ldc_channel *lp)
{
return __set_rx_head(lp, lp->rx_tail);
}
void __ldc_print(struct ldc_channel *lp, const char *caller)
{
pr_info("%s: id=0x%lx flags=0x%x state=%s cstate=0x%lx hsstate=0x%x\n"
"\trx_h=0x%lx rx_t=0x%lx rx_n=%ld\n"
"\ttx_h=0x%lx tx_t=0x%lx tx_n=%ld\n"
"\trcv_nxt=%u snd_nxt=%u\n",
caller, lp->id, lp->flags, state_to_str(lp->state),
lp->chan_state, lp->hs_state,
lp->rx_head, lp->rx_tail, lp->rx_num_entries,
lp->tx_head, lp->tx_tail, lp->tx_num_entries,
lp->rcv_nxt, lp->snd_nxt);
}
static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size)
{
struct ldc_packet *p;
@ -1592,7 +1614,7 @@ static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p,
if (err)
return err;
err = __set_rx_head(lp, lp->rx_tail);
err = ldc_rx_reset(lp);
if (err < 0)
return ldc_abort(lp);