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irdma: Remove optimization algorithm for QP doorbell #1062

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Sep 22, 2021
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irdma: Remove optimization algorithm for QP doorbell #1062

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29 changes: 2 additions & 27 deletions providers/irdma/uk.c
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Original file line number Diff line number Diff line change
Expand Up @@ -113,35 +113,10 @@ void irdma_clr_wqes(struct irdma_qp_uk *qp, __u32 qp_wqe_idx)
*/
void irdma_uk_qp_post_wr(struct irdma_qp_uk *qp)
{
__u64 temp;
__u32 hw_sq_tail;
__u32 sw_sq_head;

/* valid bit is written and loads completed before reading shadow */
/* valid bit is written before ringing doorbell */
udma_to_device_barrier();

/* read the doorbell shadow area */
get_64bit_val(qp->shadow_area, 0, &temp);

hw_sq_tail = (__u32)FIELD_GET(IRDMA_QP_DBSA_HW_SQ_TAIL, temp);
sw_sq_head = IRDMA_RING_CURRENT_HEAD(qp->sq_ring);
if (sw_sq_head != qp->initial_ring.head) {
if (qp->push_dropped) {
db_wr32(qp->qp_id, qp->wqe_alloc_db);
qp->push_dropped = false;
} else if (sw_sq_head != hw_sq_tail) {
if (sw_sq_head > qp->initial_ring.head) {
if (hw_sq_tail >= qp->initial_ring.head &&
hw_sq_tail < sw_sq_head)
db_wr32(qp->qp_id, qp->wqe_alloc_db);
} else {
if (hw_sq_tail >= qp->initial_ring.head ||
hw_sq_tail < sw_sq_head)
db_wr32(qp->qp_id, qp->wqe_alloc_db);
}
}
}

db_wr32(qp->qp_id, qp->wqe_alloc_db);
qp->initial_ring.head = qp->sq_ring.head;
}

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