IB/mthca: Add IPoIB checksum offload support

Arbel and Sinai devices support checksum generation and verification
of TCP and UDP packets for UD IPoIB messages.  This patch checks if
the HCA supports this and sets the IB_DEVICE_UD_IP_CSUM capability
flag if it does.  It implements support for handling the IB_SEND_IP_CSUM
send flag and setting the csum_ok field in receive work completions.

Signed-off-by: Eli Cohen <eli@mellnaox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c
index db5595bbf7f0..8433897624bc 100644
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/drivers/infiniband/hw/mthca/mthca_qp.c
@@ -2015,6 +2015,8 @@ int mthca_arbel_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
                         ((wr->send_flags & IB_SEND_SOLICITED) ?
                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
+                        ((wr->send_flags & IB_SEND_IP_CSUM) ?
+                         cpu_to_be32(MTHCA_NEXT_IP_CSUM | MTHCA_NEXT_TCP_UDP_CSUM) : 0) |
                         cpu_to_be32(1);
                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)