mlx4_core: Add proxy and tunnel QPs to the reserved QP area

In addition, pass the proxy and tunnel QP numbers to slaves so the
driver can perform special QP paravirtualization.

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/net/ethernet/mellanox/mlx4/fw.c b/drivers/net/ethernet/mellanox/mlx4/fw.c
index c696484..35be901 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/fw.c
+++ b/drivers/net/ethernet/mellanox/mlx4/fw.c
@@ -184,6 +184,8 @@ int mlx4_QUERY_FUNC_CAP_wrapper(struct mlx4_dev *dev, int slave,
 #define QUERY_FUNC_CAP_MCG_QUOTA_OFFSET                0x28
 #define QUERY_FUNC_CAP_MAX_EQ_OFFSET           0x2c
 #define QUERY_FUNC_CAP_RESERVED_EQ_OFFSET      0X30
+#define QUERY_FUNC_CAP_BASE_TUNNEL_QPN_OFFSET  0x44
+#define QUERY_FUNC_CAP_BASE_PROXY_QPN_OFFSET   0x48
 
 #define QUERY_FUNC_CAP_FMR_FLAG                        0x80
 #define QUERY_FUNC_CAP_FLAG_RDMA               0x40
@@ -247,6 +249,12 @@ int mlx4_QUERY_FUNC_CAP_wrapper(struct mlx4_dev *dev, int slave,
                size = dev->caps.num_mgms + dev->caps.num_amgms;
                MLX4_PUT(outbox->buf, size, QUERY_FUNC_CAP_MCG_QUOTA_OFFSET);
 
+               size = dev->caps.base_tunnel_sqpn + 8 * slave;
+               MLX4_PUT(outbox->buf, size, QUERY_FUNC_CAP_BASE_TUNNEL_QPN_OFFSET);
+
+               size = dev->caps.sqp_start + 8 * slave;
+               MLX4_PUT(outbox->buf, size, QUERY_FUNC_CAP_BASE_PROXY_QPN_OFFSET);
+
        } else
                err = -EINVAL;
 
@@ -312,6 +320,12 @@ int mlx4_QUERY_FUNC_CAP(struct mlx4_dev *dev, struct mlx4_func_cap *func_cap)
        MLX4_GET(size, outbox, QUERY_FUNC_CAP_MCG_QUOTA_OFFSET);
        func_cap->mcg_quota = size & 0xFFFFFF;
 
+       MLX4_GET(size, outbox, QUERY_FUNC_CAP_BASE_TUNNEL_QPN_OFFSET);
+       func_cap->base_tunnel_qpn = size & 0xFFFFFF;
+
+       MLX4_GET(size, outbox, QUERY_FUNC_CAP_BASE_PROXY_QPN_OFFSET);
+       func_cap->base_proxy_qpn = size & 0xFFFFFF;
+
        for (i = 1; i <= func_cap->num_ports; ++i) {
                err = mlx4_cmd_box(dev, 0, mailbox->dma, i, 1,
                                   MLX4_CMD_QUERY_FUNC_CAP,

diff --git a/drivers/net/ethernet/mellanox/mlx4/fw.h b/drivers/net/ethernet/mellanox/mlx4/fw.h
index 83fcbbf..ced1de5 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/fw.h
+++ b/drivers/net/ethernet/mellanox/mlx4/fw.h
@@ -134,6 +134,9 @@ struct mlx4_func_cap {
        int     max_eq;
        int     reserved_eq;
        int     mcg_quota;
+       u32     base_qpn;
+       u32     base_tunnel_qpn;
+       u32     base_proxy_qpn;
        u8      physical_port[MLX4_MAX_PORTS + 1];
        u8      port_flags[MLX4_MAX_PORTS + 1];
 };

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 2f816c6..06ef3af 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -384,6 +384,7 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
                dev->caps.reserved_qps_cnt[MLX4_QP_REGION_FC_ADDR] +
                dev->caps.reserved_qps_cnt[MLX4_QP_REGION_FC_EXCH];
 
+       dev->caps.sqp_demux = (mlx4_is_master(dev)) ? MLX4_MAX_NUM_SLAVES : 0;
        return 0;
 }
 /*The function checks if there are live vf, return the num of them*/
@@ -541,6 +542,10 @@ static int mlx4_slave_cap(struct mlx4_dev *dev)
                return -ENODEV;
        }
 
+       /* Calculate our sqp_start */
+       dev->caps.sqp_start = func_cap.base_proxy_qpn;
+       dev->caps.base_tunnel_sqpn = func_cap.base_tunnel_qpn;
+
        return 0;
 }
 

diff --git a/drivers/net/ethernet/mellanox/mlx4/qp.c b/drivers/net/ethernet/mellanox/mlx4/qp.c
index fb2b367..b8da72b 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/qp.c
+++ b/drivers/net/ethernet/mellanox/mlx4/qp.c
@@ -406,7 +406,7 @@ int mlx4_init_qp_table(struct mlx4_dev *dev)
         * We also reserve the MSB of the 24-bit QP number to indicate
         * that a QP is an XRC QP.
         */
-       dev->caps.sqp_start =
+       dev->caps.base_sqpn =
                ALIGN(dev->caps.reserved_qps_cnt[MLX4_QP_REGION_FW], 8);
 
        {
@@ -437,13 +437,36 @@ int mlx4_init_qp_table(struct mlx4_dev *dev)
 
        }
 
+       /* Reserve 8 real SQPs in both native and SRIOV modes.
+       * In addition, in SRIOV mode, reserve 8 proxy SQPs per function
+       * (for all PFs and VFs), and 8 corresponding tunnel QPs.
+       * Each proxy SQP works opposite its own tunnel QP.
+       *
+       * The QPs are arranged as follows:
+       * a. 8 real SQPs
+       * b. All the proxy SQPs (8 per function)
+       * c. All the tunnel QPs (8 per function)
+       */
+
        err = mlx4_bitmap_init(&qp_table->bitmap, dev->caps.num_qps,
-                              (1 << 23) - 1, dev->caps.sqp_start + 8,
+                              (1 << 23) - 1, dev->caps.base_sqpn + 8 +
+                              16 * MLX4_MFUNC_MAX * !!mlx4_is_master(dev),
                               reserved_from_top);
+
+       /* In mfunc, sqp_start is the base of the proxy SQPs, since the PF also
+        * uses paravirtualized SQPs.
+        * In native mode, sqp_start is the base of the real SQPs. */
+       if (mlx4_is_mfunc(dev)) {
+               dev->caps.sqp_start = dev->caps.base_sqpn +
+                       8 * (mlx4_master_func_num(dev) + 1);
+               dev->caps.base_tunnel_sqpn = dev->caps.sqp_start + 8 * MLX4_MFUNC_MAX;
+       } else
+               dev->caps.sqp_start = dev->caps.base_sqpn;
+
        if (err)
                return err;
 
-       return mlx4_CONF_SPECIAL_QP(dev, dev->caps.sqp_start);
+       return mlx4_CONF_SPECIAL_QP(dev, dev->caps.base_sqpn);
 }
 
 void mlx4_cleanup_qp_table(struct mlx4_dev *dev)

diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
index 293c9e8..3c57a83 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
+++ b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
@@ -1105,7 +1105,8 @@ static void res_end_move(struct mlx4_dev *dev, int slave,
 
 static int valid_reserved(struct mlx4_dev *dev, int slave, int qpn)
 {
-       return mlx4_is_qp_reserved(dev, qpn);
+       return mlx4_is_qp_reserved(dev, qpn) &&
+               (mlx4_is_master(dev) || mlx4_is_guest_proxy(dev, slave, qpn));
 }
 
 static int qp_alloc_res(struct mlx4_dev *dev, int slave, int op, int cmd,

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 07aa823..d5c82b7 100644 (file)
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -693,7 +693,18 @@ static inline int mlx4_is_master(struct mlx4_dev *dev)
 
 static inline int mlx4_is_qp_reserved(struct mlx4_dev *dev, u32 qpn)
 {
-       return (qpn < dev->caps.sqp_start + 8);
+       return (qpn < dev->caps.base_sqpn + 8 +
+               16 * MLX4_MFUNC_MAX * !!mlx4_is_master(dev));
+}
+
+static inline int mlx4_is_guest_proxy(struct mlx4_dev *dev, int slave, u32 qpn)
+{
+       int base = dev->caps.sqp_start + slave * 8;
+
+       if (qpn >= base && qpn < base + 8)
+               return 1;
+
+       return 0;
 }
 
 static inline int mlx4_is_mfunc(struct mlx4_dev *dev)