Roland> I think the solution is to keep track of the last
Roland> completed index too, and then we can figure out how many
Roland> WQEs a completion is for.
Something like this should do the trick I think...
--- hw/mthca/mthca_provider.h (revision 1915)
+++ hw/mthca/mthca_provider.h (working copy)
@@ -169,6 +169,7 @@ struct mthca_wq {
spinlock_t lock;
int max;
unsigned next_ind;
+ unsigned last_comp;
unsigned head;
unsigned tail;
void *last;
--- hw/mthca/mthca_cq.c (revision 1915)
+++ hw/mthca/mthca_cq.c (working copy)
@@ -453,7 +453,12 @@ static inline int mthca_poll_one(struct
entry->wr_id = (*cur_qp)->wrid[wqe_index];
}
- ++wq->tail;
+ if (wq->last_comp < wqe_index)
+ wq->tail += wqe_index - wq->last_comp;
+ else
+ wq->tail += wqe_index + wq->max - wq->last_comp;
+
+ wq->last_comp = wqe_index;
if (0)
mthca_dbg(dev, "%s completion for QP %06x, index %d (nr %d)\n",
--- hw/mthca/mthca_qp.c (revision 1915)
+++ hw/mthca/mthca_qp.c (working copy)
@@ -1082,6 +1082,7 @@ static void mthca_wq_init(struct mthca_w
{
spin_lock_init(&wq->lock);
wq->next_ind = 0;
+ wq->last_comp = wq->max - 1;
wq->head = 0;
wq->tail = 0;
wq->last = NULL;
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