RDMA/mlx5: Support SQD2RTS for modify QP

The transition of the QP state from SQD to RTS is allowed by the IB
specification. The hardware also supports that, but it is not
implemented in mlx5_ib.

This commit adds SQD2RTS command to the modify QP in mlx5_ib to support
the missing feature. The feature is required by the signature pipelining
API that will be added to rdma-core.

Link: https://lore.kernel.org/r/ab4876360bfba0e9d64a5e8599438e32e0cb351e.1620641808.git.leonro@nvidia.comReviewed-by: NEvgenii Kochetov <evgeniik@nvidia.com>
Signed-off-by: NSergey Gorenko <sergeygo@nvidia.com>
Signed-off-by: NLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/mlx5/qp.c

@@ -3453,6 +3453,17 @@ static enum mlx5_qp_optpar opt_mask[MLX5_QP_NUM_STATE][MLX5_QP_NUM_STATE][MLX5_Q
 					   MLX5_QP_OPTPAR_RRE,
 		},
 	},
+	[MLX5_QP_STATE_SQD] = {
+		[MLX5_QP_STATE_RTS] = {
+			[MLX5_QP_ST_UD] = MLX5_QP_OPTPAR_Q_KEY,
+			[MLX5_QP_ST_MLX] = MLX5_QP_OPTPAR_Q_KEY,
+			[MLX5_QP_ST_UC] = MLX5_QP_OPTPAR_RWE,
+			[MLX5_QP_ST_RC] = MLX5_QP_OPTPAR_RNR_TIMEOUT	|
+					  MLX5_QP_OPTPAR_RWE		|
+					  MLX5_QP_OPTPAR_RAE		|
+					  MLX5_QP_OPTPAR_RRE,
+		},
+	},
 };
 
 static int ib_nr_to_mlx5_nr(int ib_mask)
@@ -3848,6 +3859,7 @@ static int __mlx5_ib_modify_qp(struct ib_qp *ibqp,
 		[MLX5_QP_STATE_SQD] = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,
 			[MLX5_QP_STATE_ERR]	= MLX5_CMD_OP_2ERR_QP,
+			[MLX5_QP_STATE_RTS]	= MLX5_CMD_OP_SQD_RTS_QP,
 		},
 		[MLX5_QP_STATE_SQER] = {
 			[MLX5_QP_STATE_RST]	= MLX5_CMD_OP_2RST_QP,

drivers/infiniband/hw/mlx5/qpc.c

@@ -441,6 +441,12 @@ static int modify_qp_mbox_alloc(struct mlx5_core_dev *dev, u16 opcode, int qpn,
 		MOD_QP_IN_SET_QPC(sqerr2rts_qp, mbox->in, opcode, qpn,
 				  opt_param_mask, qpc, uid);
 		break;
+	case MLX5_CMD_OP_SQD_RTS_QP:
+		if (MBOX_ALLOC(mbox, sqd2rts_qp))
+			return -ENOMEM;
+		MOD_QP_IN_SET_QPC(sqd2rts_qp, mbox->in, opcode, qpn,
+				  opt_param_mask, qpc, uid);
+		break;
 	case MLX5_CMD_OP_INIT2INIT_QP:
 		if (MBOX_ALLOC(mbox, init2init_qp))
 			return -ENOMEM;