+ /*
+ * If a CQ resize is in progress and we discovered that the
+ * old buffer is empty, then peek in the new buffer, and if
+ * it's not empty, switch to the new buffer and continue
+ * polling there.
+ */
+ if (unlikely(err == -EAGAIN && cq->resize_buf &&
+ cq->resize_buf->state == CQ_RESIZE_READY)) {
+ /*
+ * In Tavor mode, the hardware keeps the producer
+ * index modulo the CQ size. Since we might be making
+ * the CQ bigger, we need to mask our consumer index
+ * using the size of the old CQ buffer before looking
+ * in the new CQ buffer.
+ */
+ if (!mthca_is_memfree(dev))
+ cq->cons_index &= cq->ibcq.cqe;
+
+ if (cqe_sw(get_cqe_from_buf(&cq->resize_buf->buf,
+ cq->cons_index & cq->resize_buf->cqe))) {
+ struct mthca_cq_buf tbuf;
+ int tcqe;
+
+ tbuf = cq->buf;
+ tcqe = cq->ibcq.cqe;
+ cq->buf = cq->resize_buf->buf;
+ cq->ibcq.cqe = cq->resize_buf->cqe;
+
+ cq->resize_buf->buf = tbuf;
+ cq->resize_buf->cqe = tcqe;
+ cq->resize_buf->state = CQ_RESIZE_SWAPPED;
+
+ goto repoll;
+ }