RDMA/hns: Add atomic support

This patch adds atomic operations for hip08, includes fetchadd and cmpswap
operation.  In order to enable atomic, the driver needs to do the
following steps:

1. Enable the atomic caps for RoCE device
2. Post the wqe context of atomic type
3. Configure the atomic type of mtpt
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_device.h

@@ -193,6 +193,7 @@ enum {
 	HNS_ROCE_CAP_FLAG_RQ_INLINE		= BIT(2),
 	HNS_ROCE_CAP_FLAG_RECORD_DB		= BIT(3),
 	HNS_ROCE_CAP_FLAG_SQ_RECORD_DB		= BIT(4),
+	HNS_ROCE_CAP_FLAG_ATOMIC		= BIT(10),
 };
 
 enum hns_roce_mtt_type {

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -54,6 +54,18 @@ static void set_data_seg_v2(struct hns_roce_v2_wqe_data_seg *dseg,
 	dseg->len  = cpu_to_le32(sg->length);
 }
 
+static void set_atomic_seg(struct hns_roce_wqe_atomic_seg *aseg,
+			   const struct ib_atomic_wr *wr)
+{
+	if (wr->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
+		aseg->fetchadd_swap_data = cpu_to_le64(wr->swap);
+		aseg->cmp_data  = cpu_to_le64(wr->compare_add);
+	} else {
+		aseg->fetchadd_swap_data = cpu_to_le64(wr->compare_add);
+		aseg->cmp_data  = 0;
+	}
+}
+
 static void set_extend_sge(struct hns_roce_qp *qp, const struct ib_send_wr *wr,
 			   unsigned int *sge_ind)
 {
@@ -179,6 +191,7 @@ static int hns_roce_v2_post_send(struct ib_qp *ibqp,
 	struct hns_roce_v2_ud_send_wqe *ud_sq_wqe;
 	struct hns_roce_v2_rc_send_wqe *rc_sq_wqe;
 	struct hns_roce_qp *qp = to_hr_qp(ibqp);
+	struct hns_roce_v2_wqe_data_seg *dseg;
 	struct device *dev = hr_dev->dev;
 	struct hns_roce_v2_db sq_db;
 	struct ib_qp_attr attr;
@@ -407,6 +420,7 @@ static int hns_roce_v2_post_send(struct ib_qp *ibqp,
 			roce_set_bit(rc_sq_wqe->byte_4,
 				     V2_RC_SEND_WQE_BYTE_4_OWNER_S, owner_bit);
 
+			wqe += sizeof(struct hns_roce_v2_rc_send_wqe);
 			switch (wr->opcode) {
 			case IB_WR_RDMA_READ:
 				hr_op = HNS_ROCE_V2_WQE_OP_RDMA_READ;
@@ -443,9 +457,21 @@ static int hns_roce_v2_post_send(struct ib_qp *ibqp,
 				break;
 			case IB_WR_ATOMIC_CMP_AND_SWP:
 				hr_op = HNS_ROCE_V2_WQE_OP_ATOM_CMP_AND_SWAP;
+				rc_sq_wqe->rkey =
+					cpu_to_le32(atomic_wr(wr)->rkey);
+				rc_sq_wqe->va =
+					cpu_to_le32(atomic_wr(wr)->remote_addr);
+				wqe += sizeof(struct hns_roce_v2_wqe_data_seg);
+				set_atomic_seg(wqe, atomic_wr(wr));
 				break;
 			case IB_WR_ATOMIC_FETCH_AND_ADD:
 				hr_op = HNS_ROCE_V2_WQE_OP_ATOM_FETCH_AND_ADD;
+				rc_sq_wqe->rkey =
+					cpu_to_le32(atomic_wr(wr)->rkey);
+				rc_sq_wqe->va =
+					cpu_to_le32(atomic_wr(wr)->remote_addr);
+				wqe += sizeof(struct hns_roce_v2_wqe_data_seg);
+				set_atomic_seg(wqe, atomic_wr(wr));
 				break;
 			case IB_WR_MASKED_ATOMIC_CMP_AND_SWP:
 				hr_op =
@@ -463,7 +489,12 @@ static int hns_roce_v2_post_send(struct ib_qp *ibqp,
 			roce_set_field(rc_sq_wqe->byte_4,
 				       V2_RC_SEND_WQE_BYTE_4_OPCODE_M,
 				       V2_RC_SEND_WQE_BYTE_4_OPCODE_S, hr_op);
-			wqe += sizeof(struct hns_roce_v2_rc_send_wqe);
+			if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
+			    wr->opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
+				dseg =
+				  wqe - sizeof(struct hns_roce_v2_wqe_data_seg);
+			else
+				dseg = wqe;
 
 			ret = set_rwqe_data_seg(ibqp, wr, rc_sq_wqe, wqe,
 						&sge_ind, bad_wr);
@@ -1232,6 +1263,9 @@ static int hns_roce_v2_profile(struct hns_roce_dev *hr_dev)
 	caps->local_ca_ack_delay = 0;
 	caps->max_mtu = IB_MTU_4096;
 
+	if (hr_dev->pci_dev->revision == 0x21)
+		caps->flags |= HNS_ROCE_CAP_FLAG_ATOMIC;
+
 	ret = hns_roce_v2_set_bt(hr_dev);
 	if (ret)
 		dev_err(hr_dev->dev, "Configure bt attribute fail, ret = %d.\n",
@@ -1663,7 +1697,8 @@ static int hns_roce_v2_write_mtpt(void *mb_buf, struct hns_roce_mr *mr,
 	roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_L_INV_EN_S, 0);
 	roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_BIND_EN_S,
 		     (mr->access & IB_ACCESS_MW_BIND ? 1 : 0));
-	roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_ATOMIC_EN_S, 0);
+	roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_ATOMIC_EN_S,
+		     mr->access & IB_ACCESS_REMOTE_ATOMIC ? 1 : 0);
 	roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_RR_EN_S,
 		     (mr->access & IB_ACCESS_REMOTE_READ ? 1 : 0));
 	roce_set_bit(mpt_entry->byte_8_mw_cnt_en, V2_MPT_BYTE_8_RW_EN_S,

drivers/infiniband/hw/hns/hns_roce_hw_v2.h

@@ -1564,4 +1564,9 @@ struct hns_roce_eq_context {
 #define HNS_ROCE_V2_AEQE_EVENT_QUEUE_NUM_S 0
 #define HNS_ROCE_V2_AEQE_EVENT_QUEUE_NUM_M GENMASK(23, 0)
 
+struct hns_roce_wqe_atomic_seg {
+	__le64          fetchadd_swap_data;
+	__le64          cmp_data;
+};
+
 #endif

drivers/infiniband/hw/hns/hns_roce_main.c

@@ -215,7 +215,8 @@ static int hns_roce_query_device(struct ib_device *ib_dev,
 	props->max_pd = hr_dev->caps.num_pds;
 	props->max_qp_rd_atom = hr_dev->caps.max_qp_dest_rdma;
 	props->max_qp_init_rd_atom = hr_dev->caps.max_qp_init_rdma;
-	props->atomic_cap = IB_ATOMIC_NONE;
+	props->atomic_cap = hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_ATOMIC ?
+			    IB_ATOMIC_HCA : IB_ATOMIC_NONE;
 	props->max_pkeys = 1;
 	props->local_ca_ack_delay = hr_dev->caps.local_ca_ack_delay;