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s390/qdio: refactor ACK processing for primed SBALs 

inbound_primed() currently has two code paths - one for QEBSM that knows
how to deal with multiple ACKs, and a non-QEBSM path that strictly
assumes a single ACK on the queue.

In preparation for a subsequent patch, slightly adjust the non-QEBSM
path so that it can manage a queue with multiple ACKs.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Julian Wiedmann 2020-04-21 10:26:22 +02:00 committed by Vasily Gorbik
parent 9de6c08700
commit 1db85d0e73
1 changed files with 7 additions and 8 deletions
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15
drivers/s390/cio/qdio_main.c
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@ -466,15 +466,14 @@ static inline void inbound_primed(struct qdio_q *q, unsigned int start,
* or by the next inbound run.
*/
new = add_buf(start, count - 1);
if (q->u.in.ack_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->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
} else {
q->u.in.ack_count = 1;
set_buf_state(q, new, SLSB_P_INPUT_ACK);
}
set_buf_state(q, new, SLSB_P_INPUT_ACK);
/* delete the previous ACKs */
if (q->u.in.ack_count)
set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
q->u.in.ack_count);
q->u.in.ack_count = 1;
q->u.in.ack_start = new;
count--;
if (!count)