net/mlx4_en: Add HW timestamping (TS) support

The patch allows to enable/disable HW timestamping for incoming and/or
outgoing packets. It adds and initializes all structs and callbacks
needed by kernel TS API.
To enable/disable HW timestamping appropriate ioctl should be used.
Currently HWTSTAMP_FILTER_ALL/NONE and HWTSAMP_TX_ON/OFF only are
supported.
When enabling TS on receive flow - VLAN stripping will be disabled.
Also were made all relevant changes in RX/TX flows to consider TS request
and plant HW timestamps into relevant structures.
mlx4_ib was fixed to compile with new mlx4_cq_alloc() signature.

Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 21 insertions, 1 deletions

diff --git a/include/linux/mlx4/cq.h b/include/linux/mlx4/cq.h
index 6f65b2c8bb89..98fa492cf406 100644
--- a/include/linux/mlx4/cq.h
+++ b/include/linux/mlx4/cq.h
@@ -64,6 +64,22 @@ struct mlx4_err_cqe {
         u8                      owner_sr_opcode;
 };
 
+struct mlx4_ts_cqe {
+        __be32                  vlan_my_qpn;
+        __be32                  immed_rss_invalid;
+        __be32                  g_mlpath_rqpn;
+        __be32                  timestamp_hi;
+        __be16                  status;
+        u8                      ipv6_ext_mask;
+        u8                      badfcs_enc;
+        __be32                  byte_cnt;
+        __be16                  wqe_index;
+        __be16                  checksum;
+        u8                      reserved;
+        __be16                  timestamp_lo;
+        u8                      owner_sr_opcode;
+} __packed;
+
 enum {
         MLX4_CQE_VLAN_PRESENT_MASK      = 1 << 29,
         MLX4_CQE_QPN_MASK               = 0xffffff,
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index e088290d9792..2fbc1464b53b 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -40,6 +40,8 @@
 
 #include <linux/atomic.h>
 
+#include <linux/clocksource.h>
+
 #define MAX_MSIX_P_PORT         17
 #define MAX_MSIX                64
 #define MSIX_LEGACY_SZ          4
@@ -840,7 +842,7 @@ void mlx4_free_hwq_res(struct mlx4_dev *mdev, struct mlx4_hwq_resources *wqres,
 
 int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt,
                   struct mlx4_uar *uar, u64 db_rec, struct mlx4_cq *cq,
-                  unsigned vector, int collapsed);
+                  unsigned vector, int collapsed, int timestamp_en);
 void mlx4_cq_free(struct mlx4_dev *dev, struct mlx4_cq *cq);
 
 int mlx4_qp_reserve_range(struct mlx4_dev *dev, int cnt, int align, int *base);
@@ -1031,4 +1033,6 @@ int set_and_calc_slave_port_state(struct mlx4_dev *dev, int slave, u8 port, int
 void mlx4_put_slave_node_guid(struct mlx4_dev *dev, int slave, __be64 guid);
 __be64 mlx4_get_slave_node_guid(struct mlx4_dev *dev, int slave);
 
+cycle_t mlx4_read_clock(struct mlx4_dev *dev);
+
 #endif /* MLX4_DEVICE_H */