Add raw packet QP support

Implement raw packet QPs for Ethernet ports.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>

[ Fix to build against old libibverbs without IBV_QPT_RAW_PACKET.  - Roland ]

Signed-off-by: Roland Dreier <roland@purestorage.com>

3 files changed, 21 insertions, 0 deletions

diff --git a/configure.in b/configure.in
index 8aad5ff..30ffed9 100644
--- a/configure.in
+++ b/configure.in
@@ -26,6 +26,7 @@ fi
 
 dnl Checks for programs
 AC_PROG_CC
+AC_LANG([C])
 
 dnl Checks for libraries
 AC_CHECK_LIB(ibverbs, ibv_get_device_list, [],
@@ -46,6 +47,16 @@ dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_CHECK_SIZEOF(long)
 
+AC_CACHE_CHECK([for IBV_QPT_RAW_PACKET],
+               [ac_cv_ibv_qpt_raw_packet],
+               [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
+                                                   [enum ibv_qp_type qpt = IBV_QPT_RAW_PACKET;])],
+                                   [ac_cv_ibv_qpt_raw_packet=yes],
+                                   [ac_cv_ibv_qpt_raw_packet=no])])
+if test $ac_cv_ibv_qpt_raw_packet = yes; then
+    AC_DEFINE([HAVE_IBV_QPT_RAW_PACKET], 1, [libibverbs has raw packet QP support])
+fi
+
 dnl Checks for library functions
 AC_CHECK_FUNC(ibv_read_sysfs_file, [],
     AC_MSG_ERROR([ibv_read_sysfs_file() not found.  libmlx4 requires libibverbs >= 1.0.3.]))
diff --git a/src/mlx4.h b/src/mlx4.h
index a4e9b32..be7a632 100644
--- a/src/mlx4.h
+++ b/src/mlx4.h
@@ -83,6 +83,10 @@
 
 #define PFX		"mlx4: "
 
+#ifndef HAVE_IBV_QPT_RAW_PACKET
+#define IBV_QPT_RAW_PACKET		8
+#endif
+
 enum {
 	MLX4_STAT_RATE_OFFSET		= 5
 };
diff --git a/src/qp.c b/src/qp.c
index 67da6a4..11c750b 100644
--- a/src/qp.c
+++ b/src/qp.c
@@ -288,6 +288,12 @@ int mlx4_post_send(struct ibv_qp *ibqp, struct ibv_send_wr *wr,
 			size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
 			break;
 
+		case IBV_QPT_RAW_PACKET:
+			/* For raw eth, the MLX4_WQE_CTRL_SOLICIT flag is used
+			 * to indicate that no icrc should be calculated */
+			ctrl->srcrb_flags |= htonl(MLX4_WQE_CTRL_SOLICIT);
+			break;
+
 		default:
 			break;
 		}