[S390] qdio: EQBS retry after CCQ 96
Running under z/VM with QIOASSIST enabled, qdio queues could stall if EQBS did not extract all SBAL states. Add an instant retry for EQBS and, if the retry fails, set up a timer to ensure outstanding SBALs are processed later. While at it, optimize qdio_do_eqbs and qdio_do_sqbs to eliminate 3 jumps on the hot path. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -104,9 +104,12 @@ static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
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/* all done or next buffer state different */
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if (ccq == 0 || ccq == 32)
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return 0;
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/* not all buffers processed */
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if (ccq == 96 || ccq == 97)
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/* no buffer processed */
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if (ccq == 97)
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return 1;
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/* not all buffers processed */
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if (ccq == 96)
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return 2;
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/* notify devices immediately */
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DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
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return -EIO;
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@ -126,10 +129,8 @@ static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
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static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
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int start, int count, int auto_ack)
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{
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int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
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unsigned int ccq = 0;
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int tmp_count = count, tmp_start = start;
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int nr = q->nr;
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int rc;
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BUG_ON(!q->irq_ptr->sch_token);
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qperf_inc(q, eqbs);
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@ -140,30 +141,34 @@ again:
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ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
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auto_ack);
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rc = qdio_check_ccq(q, ccq);
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/* At least one buffer was processed, return and extract the remaining
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* buffers later.
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*/
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if ((ccq == 96) && (count != tmp_count)) {
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qperf_inc(q, eqbs_partial);
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return (count - tmp_count);
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}
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if (!rc)
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return count - tmp_count;
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if (rc == 1) {
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DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
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goto again;
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}
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if (rc < 0) {
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if (rc == 2) {
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BUG_ON(tmp_count == count);
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qperf_inc(q, eqbs_partial);
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DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
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tmp_count);
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/*
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* Retry once, if that fails bail out and process the
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* extracted buffers before trying again.
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*/
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if (!retried++)
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goto again;
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else
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return count - tmp_count;
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}
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DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
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DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
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q->handler(q->irq_ptr->cdev,
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QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
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q->nr, q->first_to_kick, count,
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q->irq_ptr->int_parm);
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q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
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0, -1, -1, q->irq_ptr->int_parm);
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return 0;
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}
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return count - tmp_count;
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}
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/**
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@ -196,22 +201,22 @@ static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
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again:
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ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
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rc = qdio_check_ccq(q, ccq);
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if (rc == 1) {
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if (!rc) {
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WARN_ON(tmp_count);
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return count - tmp_count;
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}
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if (rc == 1 || rc == 2) {
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DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
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qperf_inc(q, sqbs_partial);
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goto again;
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}
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if (rc < 0) {
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DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
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DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
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q->handler(q->irq_ptr->cdev,
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QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
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q->nr, q->first_to_kick, count,
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q->irq_ptr->int_parm);
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q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
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0, -1, -1, q->irq_ptr->int_parm);
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return 0;
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}
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WARN_ON(tmp_count);
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return count - tmp_count;
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}
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/* returns number of examined buffers and their common state in *state */
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@ -915,10 +920,6 @@ static void __qdio_outbound_processing(struct qdio_q *q)
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if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
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goto sched;
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/* bail out for HiperSockets unicast queues */
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if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
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return;
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if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
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(atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
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goto sched;
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@ -928,8 +929,8 @@ static void __qdio_outbound_processing(struct qdio_q *q)
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/*
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* Now we know that queue type is either qeth without pci enabled
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* or HiperSockets multicast. Make sure buffer switch from PRIMED to
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* EMPTY is noticed and outbound_handler is called after some time.
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* or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
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* is noticed and outbound_handler is called after some time.
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*/
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if (qdio_outbound_q_done(q))
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del_timer(&q->u.out.timer);
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