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IB/srpt: Micro-optimize I/O context state manipulation 

Since all I/O context state changes are already serialized, it is
not necessary to protect I/O context state changes with the I/O
context spinlock. Hence remove that spinlock.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2018-01-08 11:00:51 -08:00 committed by Doug Ledford
parent dd3bec8655
commit 2d67017cc7
2 changed files with 1 additions and 17 deletions
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16
drivers/infiniband/ulp/srpt/ib_srpt.c
View File

@ -764,15 +764,10 @@ static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
enum srpt_command_state new)
{
enum srpt_command_state previous;
unsigned long flags;
BUG_ON(!ioctx);
spin_lock_irqsave(&ioctx->spinlock, flags);
previous = ioctx->state;
if (previous != SRPT_STATE_DONE)
ioctx->state = new;
spin_unlock_irqrestore(&ioctx->spinlock, flags);
return previous;
}
@ -790,17 +785,15 @@ static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
enum srpt_command_state new)
{
enum srpt_command_state previous;
unsigned long flags;
WARN_ON(!ioctx);
WARN_ON(old == SRPT_STATE_DONE);
WARN_ON(new == SRPT_STATE_NEW);
spin_lock_irqsave(&ioctx->spinlock, flags);
previous = ioctx->state;
if (previous == old)
ioctx->state = new;
spin_unlock_irqrestore(&ioctx->spinlock, flags);
return previous == old;
}
@ -1170,7 +1163,6 @@ static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
return ioctx;
BUG_ON(ioctx->ch != ch);
spin_lock_init(&ioctx->spinlock);
ioctx->state = SRPT_STATE_NEW;
ioctx->n_rdma = 0;
ioctx->n_rw_ctx = 0;
@ -1192,7 +1184,6 @@ static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
{
enum srpt_command_state state;
unsigned long flags;
BUG_ON(!ioctx);
@ -1201,7 +1192,6 @@ static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
* the ib_srpt driver, change the state to the next state.
*/
spin_lock_irqsave(&ioctx->spinlock, flags);
state = ioctx->state;
switch (state) {
case SRPT_STATE_NEED_DATA:
@ -1216,7 +1206,6 @@ static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
__func__, state);
break;
}
spin_unlock_irqrestore(&ioctx->spinlock, flags);
pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state,
ioctx->state, ioctx->cmd.tag);
@ -2431,13 +2420,11 @@ static void srpt_queue_response(struct se_cmd *cmd)
struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr;
struct ib_sge sge;
enum srpt_command_state state;
unsigned long flags;
int resp_len, ret, i;
u8 srp_tm_status;
BUG_ON(!ch);
spin_lock_irqsave(&ioctx->spinlock, flags);
state = ioctx->state;
switch (state) {
case SRPT_STATE_NEW:
@ -2452,7 +2439,6 @@ static void srpt_queue_response(struct se_cmd *cmd)
ch, ioctx->ioctx.index, ioctx->state);
break;
}
spin_unlock_irqrestore(&ioctx->spinlock, flags);
if (unlikely(WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT)))
return;

2
drivers/infiniband/ulp/srpt/ib_srpt.h
View File

@ -195,7 +195,6 @@ struct srpt_rw_ctx {
* @rw_ctxs: RDMA read/write contexts.
* @rdma_cqe: RDMA completion queue element.
* @free_list: Node in srpt_rdma_ch.free_list.
* @spinlock: Protects 'state'.
* @state: I/O context state.
* @cmd: Target core command data structure.
* @sense_data: SCSI sense data.
@ -213,7 +212,6 @@ struct srpt_send_ioctx {
struct ib_cqe rdma_cqe;
struct list_head free_list;
spinlock_t spinlock;
enum srpt_command_state state;
struct se_cmd cmd;
u8 n_rdma;