IB/mlx4: Add IPoIB checksum offload support

ConnectX 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@mellanox.co.il>
Signed-off-by: Ali Ayub <ali@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 18 insertions, 6 deletions

diff --git a/include/linux/mlx4/cq.h b/include/linux/mlx4/cq.h
index 0181e0a57cbf..1243ebace561 100644
--- a/include/linux/mlx4/cq.h
+++ b/include/linux/mlx4/cq.h
@@ -45,11 +45,11 @@ struct mlx4_cqe {
         u8                      sl;
         u8                      reserved1;
         __be16                  rlid;
-        u32                     reserved2;
+        __be32                  ipoib_status;
         __be32                  byte_cnt;
         __be16                  wqe_index;
         __be16                  checksum;
-        u8                      reserved3[3];
+        u8                      reserved2[3];
         u8                      owner_sr_opcode;
 };
 
@@ -85,6 +85,16 @@ enum {
         MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR            = 0x22,
 };
 
+enum {
+        MLX4_CQE_IPOIB_STATUS_IPV4                      = 1 << 22,
+        MLX4_CQE_IPOIB_STATUS_IPV4F                     = 1 << 23,
+        MLX4_CQE_IPOIB_STATUS_IPV6                      = 1 << 24,
+        MLX4_CQE_IPOIB_STATUS_IPV4OPT                   = 1 << 25,
+        MLX4_CQE_IPOIB_STATUS_TCP                       = 1 << 26,
+        MLX4_CQE_IPOIB_STATUS_UDP                       = 1 << 27,
+        MLX4_CQE_IPOIB_STATUS_IPOK                      = 1 << 28,
+};
+
 static inline void mlx4_cq_arm(struct mlx4_cq *cq, u32 cmd,
                                void __iomem *uar_page,
                                spinlock_t *doorbell_lock)
diff --git a/include/linux/mlx4/qp.h b/include/linux/mlx4/qp.h
index 09a2230923f2..31f9eb3ccbb3 100644
--- a/include/linux/mlx4/qp.h
+++ b/include/linux/mlx4/qp.h
@@ -158,10 +158,12 @@ struct mlx4_qp_context {
 #define MLX4_FW_VER_WQE_CTRL_NEC mlx4_fw_ver(2, 2, 232)
 
 enum {
-        MLX4_WQE_CTRL_NEC       = 1 << 29,
-        MLX4_WQE_CTRL_FENCE     = 1 << 6,
-        MLX4_WQE_CTRL_CQ_UPDATE = 3 << 2,
-        MLX4_WQE_CTRL_SOLICITED = 1 << 1,
+        MLX4_WQE_CTRL_NEC               = 1 << 29,
+        MLX4_WQE_CTRL_FENCE             = 1 << 6,
+        MLX4_WQE_CTRL_CQ_UPDATE         = 3 << 2,
+        MLX4_WQE_CTRL_SOLICITED         = 1 << 1,
+        MLX4_WQE_CTRL_IP_CSUM           = 1 << 4,
+        MLX4_WQE_CTRL_TCP_UDP_CSUM      = 1 << 5,
 };
 
 struct mlx4_wqe_ctrl_seg {