RDMA/mlx5: Return ECE DC support

The DC QPs are many-to-one QP types that means that first connection will
establish ECE options that coming connections should follow.  Due to this
property, the ECE code was removed between first [1] and second [2] ECE
submissions.

This patch returns the dropped code, because ECE is a property of a
connection and like any other connection users are needed to manage this
data. Allow them to set ECE parameter for DC too and avoid need of having
compatibility flag for the DC ECE.

[1]
https://lore.kernel.org/linux-rdma/20200523132243.817936-1-leon@kernel.org/
[2]
https://lore.kernel.org/linux-rdma/20200525174401.71152-1-leon@kernel.org/

Link: https://lore.kernel.org/r/20200602125548.172654-4-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index 18135f908971fd8b08ef5184441b74e6ce13b737..81bf6b975e0e24bd9d586b97ad9028533c3581c1 100644 (file)
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -2404,7 +2404,8 @@ static void destroy_qp_common(struct mlx5_ib_dev *dev, struct mlx5_ib_qp *qp,
        destroy_qp(dev, qp, base, udata);
 }
 
-static int create_dct(struct ib_pd *pd, struct mlx5_ib_qp *qp,
+static int create_dct(struct mlx5_ib_dev *dev, struct ib_pd *pd,
+                     struct mlx5_ib_qp *qp,
                      struct mlx5_create_qp_params *params)
 {
        struct ib_qp_init_attr *attr = params->attr;
@@ -2423,6 +2424,8 @@ static int create_dct(struct ib_pd *pd, struct mlx5_ib_qp *qp,
        MLX5_SET(dctc, dctc, cqn, to_mcq(attr->recv_cq)->mcq.cqn);
        MLX5_SET64(dctc, dctc, dc_access_key, ucmd->access_key);
        MLX5_SET(dctc, dctc, user_index, uidx);
+       if (MLX5_CAP_GEN(dev->mdev, ece_support))
+               MLX5_SET(dctc, dctc, ece, ucmd->ece_options);
 
        if (qp->flags_en & MLX5_QP_FLAG_SCATTER_CQE) {
                int rcqe_sz = mlx5_ib_get_cqe_size(attr->recv_cq);
@@ -2768,7 +2771,7 @@ static int create_qp(struct mlx5_ib_dev *dev, struct ib_pd *pd,
        }
 
        if (qp->type == MLX5_IB_QPT_DCT) {
-               err = create_dct(pd, qp, params);
+               err = create_dct(dev, pd, qp, params);
                goto out;
        }
 
@@ -2882,9 +2885,8 @@ static int check_ucmd_data(struct mlx5_ib_dev *dev,
                 */
                last = sizeof(struct mlx5_ib_create_qp_rss);
        else
-               /* IB_QPT_RAW_PACKET and IB_QPT_DRIVER don't have ECE data */
+               /* IB_QPT_RAW_PACKET doesn't have ECE data */
                switch (attr->qp_type) {
-               case IB_QPT_DRIVER:
                case IB_QPT_RAW_PACKET:
                        last = offsetof(struct mlx5_ib_create_qp, ece_options);
                        break;
@@ -4095,7 +4097,8 @@ static bool modify_dci_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state new
  * Other transitions and attributes are illegal
  */
 static int mlx5_ib_modify_dct(struct ib_qp *ibqp, struct ib_qp_attr *attr,
-                             int attr_mask, struct ib_udata *udata)
+                             int attr_mask, struct mlx5_ib_modify_qp *ucmd,
+                             struct ib_udata *udata)
 {
        struct mlx5_ib_qp *qp = to_mqp(ibqp);
        struct mlx5_ib_dev *dev = to_mdev(ibqp->device);
@@ -4111,6 +4114,15 @@ static int mlx5_ib_modify_dct(struct ib_qp *ibqp, struct ib_qp_attr *attr,
        new_state = attr->qp_state;
 
        dctc = MLX5_ADDR_OF(create_dct_in, qp->dct.in, dct_context_entry);
+       if (MLX5_CAP_GEN(dev->mdev, ece_support) && ucmd->ece_options)
+               /*
+                * DCT doesn't initialize QP till modify command is executed,
+                * so we need to overwrite previously set ECE field if user
+                * provided any value except zero, which means not set/not
+                * valid.
+                */
+               MLX5_SET(dctc, dctc, ece, ucmd->ece_options);
+
        if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
                u16 set_id;
 
@@ -4145,14 +4157,21 @@ static int mlx5_ib_modify_dct(struct ib_qp *ibqp, struct ib_qp_attr *attr,
                MLX5_SET(dctc, dctc, counter_set_id, set_id);
        } else if (cur_state == IB_QPS_INIT && new_state == IB_QPS_RTR) {
                struct mlx5_ib_modify_qp_resp resp = {};
-               u32 out[MLX5_ST_SZ_DW(create_dct_out)] = {0};
-               u32 min_resp_len = offsetof(typeof(resp), dctn) +
-                                  sizeof(resp.dctn);
+               u32 out[MLX5_ST_SZ_DW(create_dct_out)] = {};
+               u32 min_resp_len = offsetofend(typeof(resp), dctn);
 
                if (udata->outlen < min_resp_len)
                        return -EINVAL;
                resp.response_length = min_resp_len;
 
+               /*
+                * If we don't have enough space for the ECE options,
+                * simply indicate it with resp.response_length.
+                */
+               resp.response_length = (udata->outlen < sizeof(resp)) ?
+                                              min_resp_len :
+                                              sizeof(resp);
+
                required |= IB_QP_MIN_RNR_TIMER | IB_QP_AV | IB_QP_PATH_MTU;
                if (!is_valid_mask(attr_mask, required, 0))
                        return -EINVAL;
@@ -4169,6 +4188,8 @@ static int mlx5_ib_modify_dct(struct ib_qp *ibqp, struct ib_qp_attr *attr,
                if (err)
                        return err;
                resp.dctn = qp->dct.mdct.mqp.qpn;
+               if (MLX5_CAP_GEN(dev->mdev, ece_support))
+                       resp.ece_options = MLX5_GET(create_dct_out, out, ece);
                err = ib_copy_to_udata(udata, &resp, resp.response_length);
                if (err) {
                        mlx5_core_destroy_dct(dev, &qp->dct.mdct);
@@ -4226,12 +4247,8 @@ int mlx5_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
        qp_type = (unlikely(ibqp->qp_type == MLX5_IB_QPT_HW_GSI)) ? IB_QPT_GSI :
                                                                    qp->type;
 
-       if (qp_type == MLX5_IB_QPT_DCT) {
-               if (memchr_inv(&ucmd.ece_options, 0, sizeof(ucmd.ece_options)))
-                       return -EOPNOTSUPP;
-
-               return mlx5_ib_modify_dct(ibqp, attr, attr_mask, udata);
-       }
+       if (qp_type == MLX5_IB_QPT_DCT)
+               return mlx5_ib_modify_dct(ibqp, attr, attr_mask, &ucmd, udata);
 
        mutex_lock(&qp->mutex);
 

diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 4d2e36dd2c6b6dc1f0fdadd40828c50b5489f7df..116bd9bb347f24e69875c2f017264f95264cbac9 100644 (file)
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -3690,7 +3690,8 @@ struct mlx5_ifc_dctc_bits {
        u8         ecn[0x2];
        u8         dscp[0x6];
 
-       u8         reserved_at_1c0[0x40];
+       u8         reserved_at_1c0[0x20];
+       u8         ece[0x20];
 };
 
 enum {
@@ -7940,7 +7941,7 @@ struct mlx5_ifc_create_dct_out_bits {
        u8         reserved_at_40[0x8];
        u8         dctn[0x18];
 
-       u8         reserved_at_60[0x20];
+       u8         ece[0x20];
 };
 
 struct mlx5_ifc_create_dct_in_bits {