[PATCH for-next v2 2/3] RDMA/erdma: Report atomic capacity when hardware supports atomic feature

[Cheng Xu <chengyou@xxxxxxxxxxxxxxxxx>]

Introduce "capacity flags" field at where hardware put all zeros originally
in "query device" response. Using this field, hardware can report atomic
feature if supports.

Signed-off-by: Cheng Xu <chengyou@xxxxxxxxxxxxxxxxx>
---
 drivers/infiniband/hw/erdma/erdma.h       | 1 +
 drivers/infiniband/hw/erdma/erdma_hw.h    | 5 +++++
 drivers/infiniband/hw/erdma/erdma_main.c  | 1 +
 drivers/infiniband/hw/erdma/erdma_verbs.c | 4 ++++
 4 files changed, 11 insertions(+)

diff --git a/drivers/infiniband/hw/erdma/erdma.h b/drivers/infiniband/hw/erdma/erdma.h
index 730783fbc894..bb23d897c710 100644
--- a/drivers/infiniband/hw/erdma/erdma.h
+++ b/drivers/infiniband/hw/erdma/erdma.h
@@ -124,6 +124,7 @@ struct erdma_devattr {
 	u32 fw_version;
 
 	unsigned char peer_addr[ETH_ALEN];
+	unsigned long cap_flags;
 
 	int numa_node;
 	enum erdma_cc_alg cc;
diff --git a/drivers/infiniband/hw/erdma/erdma_hw.h b/drivers/infiniband/hw/erdma/erdma_hw.h
index 2a9a4c73d52c..808e7ee56d93 100644
--- a/drivers/infiniband/hw/erdma/erdma_hw.h
+++ b/drivers/infiniband/hw/erdma/erdma_hw.h
@@ -303,6 +303,7 @@ struct erdma_cmdq_destroy_qp_req {
 
 /* cap qword 0 definition */
 #define ERDMA_CMD_DEV_CAP_MAX_CQE_MASK GENMASK_ULL(47, 40)
+#define ERDMA_CMD_DEV_CAP_FLAGS_MASK GENMASK_ULL(31, 24)
 #define ERDMA_CMD_DEV_CAP_MAX_RECV_WR_MASK GENMASK_ULL(23, 16)
 #define ERDMA_CMD_DEV_CAP_MAX_MR_SIZE_MASK GENMASK_ULL(7, 0)
 
@@ -314,6 +315,10 @@ struct erdma_cmdq_destroy_qp_req {
 
 #define ERDMA_NQP_PER_QBLOCK 1024
 
+enum {
+	ERDMA_DEV_CAP_FLAGS_ATOMIC = 1 << 7,
+};
+
 #define ERDMA_CMD_INFO0_FW_VER_MASK GENMASK_ULL(31, 0)
 
 /* CQE hdr */
diff --git a/drivers/infiniband/hw/erdma/erdma_main.c b/drivers/infiniband/hw/erdma/erdma_main.c
index 49778bb294ae..e44b06fea595 100644
--- a/drivers/infiniband/hw/erdma/erdma_main.c
+++ b/drivers/infiniband/hw/erdma/erdma_main.c
@@ -374,6 +374,7 @@ static int erdma_dev_attrs_init(struct erdma_dev *dev)
 	dev->attrs.max_qp = ERDMA_NQP_PER_QBLOCK * ERDMA_GET_CAP(QBLOCK, cap1);
 	dev->attrs.max_mr = dev->attrs.max_qp << 1;
 	dev->attrs.max_cq = dev->attrs.max_qp << 1;
+	dev->attrs.cap_flags = ERDMA_GET_CAP(FLAGS, cap0);
 
 	dev->attrs.max_send_wr = ERDMA_MAX_SEND_WR;
 	dev->attrs.max_ord = ERDMA_MAX_ORD;
diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
index f3bf87f17527..d843ce1f35f3 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.c
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
@@ -288,6 +288,10 @@ int erdma_query_device(struct ib_device *ibdev, struct ib_device_attr *attr,
 	attr->max_mw = dev->attrs.max_mw;
 	attr->max_fast_reg_page_list_len = ERDMA_MAX_FRMR_PA;
 	attr->page_size_cap = ERDMA_PAGE_SIZE_SUPPORT;
+
+	if (dev->attrs.cap_flags & ERDMA_DEV_CAP_FLAGS_ATOMIC)
+		attr->atomic_cap = IB_ATOMIC_GLOB;
+
 	attr->fw_ver = dev->attrs.fw_version;
 
 	if (dev->netdev)
-- 
2.27.0