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[S390] qdio: move ACK to newest buffer for devices without QEBSM

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The ACKnowledgement state should be set on the newest SBAL so an
adapter interrupt surpression check needs to scan fewer SBALs.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber 2009-03-26 15:24:28 +01:00 committed by Martin Schwidefsky
parent 700e982f28
commit 3fdf1e18cb
1 changed files with 8 additions and 5 deletions
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13
drivers/s390/cio/qdio_main.c
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@ -440,12 +440,16 @@ static inline void inbound_primed(struct qdio_q *q, int count)
/* reset the previous ACK but first set the new one */
set_buf_state(q, new, SLSB_P_INPUT_ACK);
set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT);
}
else {
} else {
q->u.in.polling = 1;
set_buf_state(q, q->first_to_check, SLSB_P_INPUT_ACK);
set_buf_state(q, new, SLSB_P_INPUT_ACK);
}
/*
* last_move_ftc points to the ACK'ed buffer and not to the last turns
* first_to_check like for qebsm. Since it is only used to check if
* the queue front moved in qdio_inbound_q_done this is not a problem.
*/
q->last_move_ftc = new;
count--;
if (!count)
@ -455,7 +459,7 @@ static inline void inbound_primed(struct qdio_q *q, int count)
* Need to change all PRIMED buffers to NOT_INIT, otherwise
* we're loosing initiative in the thinint code.
*/
set_buf_states(q, next_buf(q->first_to_check), SLSB_P_INPUT_NOT_INIT,
set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT,
count);
}
@ -1480,7 +1484,6 @@ static void handle_inbound(struct qdio_q *q, unsigned int callflags,
if (q->u.in.ack_count <= 0) {
q->u.in.polling = 0;
q->u.in.ack_count = 0;
/* TODO: must we set last_move_ftc to something meaningful? */
goto set;
}
q->last_move_ftc = add_buf(q->last_move_ftc, diff);