IB: Change CQE "csum_ok" field to a bit flag
Use a bit in wc_flags rather then a whole integer to hold the
"checksum OK" flag. By itself, this change doesn't reduce the size of
struct ib_wc on 64bit machines -- it stays on 56 bytes because of
padding. However, it will allow to add more fields in the future
without enlarging the struct. Also, it will let us have a unified
approach with future libibverbs checksum offload reporting, because a
bit flag doesn't break the library ABI.
This patch was suggested during conversation with Liran Liss
<liranl@mellanox.com>.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/mlx4/cq.c b/drivers/infiniband/hw/mlx4/cq.c
index 5ecf38d..09eb1d1 100644
--- a/drivers/infiniband/hw/mlx4/cq.c
+++ b/drivers/infiniband/hw/mlx4/cq.c
@@ -720,7 +720,8 @@
wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
wc->wc_flags |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
wc->pkey_index = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
- wc->csum_ok = mlx4_ib_ipoib_csum_ok(cqe->status, cqe->checksum);
+ wc->wc_flags |= mlx4_ib_ipoib_csum_ok(cqe->status,
+ cqe->checksum) ? IB_WC_IP_CSUM_OK : 0;
if (rdma_port_get_link_layer(wc->qp->device,
(*cur_qp)->port) == IB_LINK_LAYER_ETHERNET)
wc->sl = be16_to_cpu(cqe->sl_vid) >> 13;