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accel: sequence state machine

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Processing a sequence consists of multiple steps and we call
accel_process_sequence() mutliple times, so we need to check various
things to verify if some of those steps have already been done.  Having
a state machine allows us to reduce the number of such checks and makes
it easier to add additional steps.

Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Change-Id: I254819fee0893866de395193041b319cbad228ec
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/15945
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
This commit is contained in:
Konrad Sztyber 2022-12-12 15:32:45 +01:00 committed by Jim Harris
parent 9a562043a7
commit fb67fa548f
1 changed files with 143 additions and 34 deletions
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139
lib/accel/accel.c
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@ -61,6 +61,37 @@ static const char *g_opcode_strings[ACCEL_OPC_LAST] = {
"compress", "decompress", "encrypt", "decrypt"
};
enum accel_sequence_state {
ACCEL_SEQUENCE_STATE_INIT,
ACCEL_SEQUENCE_STATE_CHECK_VIRTBUF,
ACCEL_SEQUENCE_STATE_AWAIT_VIRTBUF,
ACCEL_SEQUENCE_STATE_CHECK_BOUNCEBUF,
ACCEL_SEQUENCE_STATE_AWAIT_BOUNCEBUF,
ACCEL_SEQUENCE_STATE_EXEC_TASK,
ACCEL_SEQUENCE_STATE_AWAIT_TASK,
ACCEL_SEQUENCE_STATE_COMPLETE_TASK,
ACCEL_SEQUENCE_STATE_ERROR,
ACCEL_SEQUENCE_STATE_MAX,
};
static const char *g_seq_states[]
__attribute__((unused)) = {
[ACCEL_SEQUENCE_STATE_INIT] = "init",
[ACCEL_SEQUENCE_STATE_CHECK_VIRTBUF] = "check-virtbuf",
[ACCEL_SEQUENCE_STATE_AWAIT_VIRTBUF] = "await-virtbuf",
[ACCEL_SEQUENCE_STATE_CHECK_BOUNCEBUF] = "check-bouncebuf",
[ACCEL_SEQUENCE_STATE_AWAIT_BOUNCEBUF] = "await-bouncebuf",
[ACCEL_SEQUENCE_STATE_EXEC_TASK] = "exec-task",
[ACCEL_SEQUENCE_STATE_AWAIT_TASK] = "await-task",
[ACCEL_SEQUENCE_STATE_COMPLETE_TASK] = "complete-task",
[ACCEL_SEQUENCE_STATE_ERROR] = "error",
[ACCEL_SEQUENCE_STATE_MAX] = "",
};
#define ACCEL_SEQUENCE_STATE_STRING(s) \
(((s) >= ACCEL_SEQUENCE_STATE_INIT && (s) < ACCEL_SEQUENCE_STATE_MAX) \
? g_seq_states[s] : "unknown")
struct accel_buffer {
struct spdk_accel_sequence *seq;
void *buf;
@ -87,11 +118,30 @@ struct spdk_accel_sequence {
struct accel_sequence_tasks tasks;
struct accel_sequence_tasks completed;
TAILQ_HEAD(, accel_buffer) bounce_bufs;
enum accel_sequence_state state;
int status;
bool in_process_sequence;
spdk_accel_completion_cb cb_fn;
void *cb_arg;
TAILQ_ENTRY(spdk_accel_sequence) link;
};
static inline void
accel_sequence_set_state(struct spdk_accel_sequence *seq, enum accel_sequence_state state)
{
SPDK_DEBUGLOG(accel, "seq=%p, setting state: %s -> %s\n", seq,
ACCEL_SEQUENCE_STATE_STRING(seq->state), ACCEL_SEQUENCE_STATE_STRING(state));
seq->state = state;
}
static void
accel_sequence_set_fail(struct spdk_accel_sequence *seq, int status)
{
accel_sequence_set_state(seq, ACCEL_SEQUENCE_STATE_ERROR);
assert(status != 0);
seq->status = status;
}
int
spdk_accel_get_opc_module_name(enum accel_opcode opcode, const char **module_name)
{
@ -670,6 +720,9 @@ accel_sequence_get(struct accel_io_channel *ch)
TAILQ_INIT(&seq->bounce_bufs);
seq->ch = ch;
seq->status = 0;
seq->state = ACCEL_SEQUENCE_STATE_INIT;
seq->in_process_sequence = false;
return seq;
}
@ -935,15 +988,15 @@ accel_sequence_complete_tasks(struct spdk_accel_sequence *seq)
}
static void
accel_sequence_complete(struct spdk_accel_sequence *seq, int status)
accel_sequence_complete(struct spdk_accel_sequence *seq)
{
SPDK_DEBUGLOG(accel, "Completed sequence: %p with status: %d\n", seq, status);
SPDK_DEBUGLOG(accel, "Completed sequence: %p with status: %d\n", seq, seq->status);
/* First notify all users that appended operations to this sequence */
accel_sequence_complete_tasks(seq);
/* Then notify the user that finished the sequence */
seq->cb_fn(seq->cb_arg, status);
seq->cb_fn(seq->cb_arg, seq->status);
accel_sequence_put(seq);
}
@ -1002,6 +1055,8 @@ accel_iobuf_get_virtbuf_cb(struct spdk_iobuf_entry *entry, void *buf)
assert(accel_buf->buf == NULL);
accel_buf->buf = buf;
assert(accel_buf->seq->state == ACCEL_SEQUENCE_STATE_AWAIT_VIRTBUF);
accel_sequence_set_state(accel_buf->seq, ACCEL_SEQUENCE_STATE_CHECK_VIRTBUF);
accel_sequence_set_virtbuf(accel_buf->seq, accel_buf);
accel_process_sequence(accel_buf->seq);
}
@ -1093,6 +1148,8 @@ accel_iobuf_get_src_bounce_cb(struct spdk_iobuf_entry *entry, void *buf)
task = TAILQ_FIRST(&accel_buf->seq->tasks);
assert(task != NULL);
assert(accel_buf->seq->state == ACCEL_SEQUENCE_STATE_AWAIT_BOUNCEBUF);
accel_sequence_set_state(accel_buf->seq, ACCEL_SEQUENCE_STATE_CHECK_BOUNCEBUF);
accel_set_bounce_buffer(&task->bounce.s, &task->s.iovs, &task->s.iovcnt, &task->src_domain,
&task->src_domain_ctx, accel_buf);
accel_process_sequence(accel_buf->seq);
@ -1111,6 +1168,8 @@ accel_iobuf_get_dst_bounce_cb(struct spdk_iobuf_entry *entry, void *buf)
task = TAILQ_FIRST(&accel_buf->seq->tasks);
assert(task != NULL);
assert(accel_buf->seq->state == ACCEL_SEQUENCE_STATE_AWAIT_BOUNCEBUF);
accel_sequence_set_state(accel_buf->seq, ACCEL_SEQUENCE_STATE_CHECK_BOUNCEBUF);
accel_set_bounce_buffer(&task->bounce.d, &task->d.iovs, &task->d.iovcnt, &task->dst_domain,
&task->dst_domain_ctx, accel_buf);
accel_process_sequence(accel_buf->seq);
@ -1170,32 +1229,49 @@ accel_process_sequence(struct spdk_accel_sequence *seq)
struct spdk_accel_module_if *module;
struct spdk_io_channel *module_ch;
struct spdk_accel_task *task;
enum accel_sequence_state state;
int rc;
/* Prevent recursive calls to this function */
if (spdk_unlikely(seq->in_process_sequence)) {
return;
}
seq->in_process_sequence = true;
task = TAILQ_FIRST(&seq->tasks);
if (task == NULL) {
/* We've processed all tasks */
accel_sequence_complete(seq, 0);
accel_sequence_complete(seq);
return;
}
do {
state = seq->state;
switch (state) {
case ACCEL_SEQUENCE_STATE_INIT:
case ACCEL_SEQUENCE_STATE_CHECK_VIRTBUF:
accel_sequence_set_state(seq, ACCEL_SEQUENCE_STATE_AWAIT_VIRTBUF);
if (!accel_sequence_check_virtbuf(seq, task)) {
/* We couldn't allocate a buffer, wait until one is available */
return;
break;
}
accel_sequence_set_state(seq, ACCEL_SEQUENCE_STATE_CHECK_BOUNCEBUF);
/* Fall through */
case ACCEL_SEQUENCE_STATE_CHECK_BOUNCEBUF:
accel_sequence_set_state(seq, ACCEL_SEQUENCE_STATE_AWAIT_BOUNCEBUF);
/* For now, assume that none of the modules support memory domains */
rc = accel_sequence_check_bouncebuf(seq, task);
if (rc != 0) {
if (rc == -EAGAIN) {
/* We couldn't allocate a buffer, wait until one is available */
return;
if (rc == -EAGAIN) {
break;
}
accel_sequence_complete(seq, rc);
return;
accel_sequence_set_fail(seq, rc);
break;
}
accel_sequence_set_state(seq, ACCEL_SEQUENCE_STATE_EXEC_TASK);
/* Fall through */
case ACCEL_SEQUENCE_STATE_EXEC_TASK:
SPDK_DEBUGLOG(accel, "Executing %s operation, sequence: %p\n",
g_opcode_strings[task->op_code], seq);
@ -1205,12 +1281,43 @@ accel_process_sequence(struct spdk_accel_sequence *seq)
module = g_modules_opc[task->op_code];
module_ch = accel_ch->module_ch[task->op_code];
accel_sequence_set_state(seq, ACCEL_SEQUENCE_STATE_AWAIT_TASK);
rc = module->submit_tasks(module_ch, task);
if (spdk_unlikely(rc != 0)) {
SPDK_ERRLOG("Failed to submit %s operation, sequence: %p\n",
g_opcode_strings[task->op_code], seq);
accel_sequence_complete(seq, rc);
accel_sequence_set_fail(seq, rc);
}
break;
case ACCEL_SEQUENCE_STATE_COMPLETE_TASK:
/* Update the task pointer here, in case a task was completed by a module
* from submit_tasks() */
task = TAILQ_FIRST(&seq->tasks);
if (task == NULL) {
/* Immediately return here to make sure we don't touch the sequence
* after it's completed */
accel_sequence_complete(seq);
return;
}
accel_sequence_set_state(seq, ACCEL_SEQUENCE_STATE_INIT);
break;
case ACCEL_SEQUENCE_STATE_ERROR:
/* Immediately return here to make sure we don't touch the sequence
* after it's completed */
assert(seq->status != 0);
accel_sequence_complete(seq);
return;
case ACCEL_SEQUENCE_STATE_AWAIT_VIRTBUF:
case ACCEL_SEQUENCE_STATE_AWAIT_BOUNCEBUF:
case ACCEL_SEQUENCE_STATE_AWAIT_TASK:
break;
default:
assert(0 && "bad state");
break;
}
} while (seq->state != state);
seq->in_process_sequence = false;
}
static void
@ -1227,14 +1334,16 @@ accel_sequence_task_cb(void *cb_arg, int status)
assert(task != NULL);
TAILQ_REMOVE(&accel_ch->task_pool, task, link);
assert(seq->state == ACCEL_SEQUENCE_STATE_AWAIT_TASK);
accel_sequence_set_state(seq, ACCEL_SEQUENCE_STATE_COMPLETE_TASK);
TAILQ_REMOVE(&seq->tasks, task, seq_link);
TAILQ_INSERT_TAIL(&seq->completed, task, seq_link);
if (spdk_unlikely(status != 0)) {
SPDK_ERRLOG("Failed to execute %s operation, sequence: %p\n",
g_opcode_strings[task->op_code], seq);
accel_sequence_complete(seq, status);
return;
accel_sequence_set_fail(seq, status);
}
accel_process_sequence(seq);