Using stock 2.6.17.1, with verbs 1.0.3-1.fc4 and mthca 1.0.2-1.fc4
with MT25204, this line:
ret = ibv_query_device(ctx, &hca_cap);
tells me that hca_cap.max_sge = 30.
However, this code fails, with the last kernel write returning EINVAL:
memset(&att, 0, sizeof(att));
att.send_cq = 1024;
att.recv_cq = 1024;
att.cap.max_recv_wr = 512;
att.cap.max_send_wr = 512;
att.cap.max_recv_sge = 30;
att.cap.max_send_sge = 30;
att.qp_type = IBV_QPT_RC;
qp = ibv_create_qp(pd, &att);
But if I set:
att.cap.max_recv_sge = 30;
att.cap.max_send_sge = 29; /* hca_cap.max_sge - 1 */
the QP create succeeds.
Is this a known issue? Should I always subtract 1 from the reported
max on the send side? Just for this hardware?
-- Pete
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