From: Yixian Liu <liuyixian@huawei.com>
Date: Fri, 9 Mar 2018 18:36:29 +0800
Subject: RDMA/hns: Support rq record doorbell for the user space
Patch-mainline: v4.17-rc1
Git-commit: e088a685eae94a0607b8f7b99949a0e14d748813
References: bsc#1104427 FATE#326416
This patch adds interfaces and definitions to support the rq record
doorbell for the user space.
Signed-off-by: Yixian Liu <liuyixian@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Shaobo Xu <xushaobo2@huawei.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/hw/hns/Makefile | 2
drivers/infiniband/hw/hns/hns_roce_db.c | 68 ++++++++++++++++++++++++++++
drivers/infiniband/hw/hns/hns_roce_device.h | 46 ++++++++++++++++++
drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 26 ++++++++++
drivers/infiniband/hw/hns/hns_roce_main.c | 5 ++
drivers/infiniband/hw/hns/hns_roce_qp.c | 53 +++++++++++++++++++++
include/uapi/rdma/hns-abi.h | 5 ++
7 files changed, 200 insertions(+), 5 deletions(-)
create mode 100644 drivers/infiniband/hw/hns/hns_roce_db.c
--- a/drivers/infiniband/hw/hns/Makefile
+++ b/drivers/infiniband/hw/hns/Makefile
@@ -7,7 +7,7 @@ ccflags-y := -Idrivers/net/ethernet/his
obj-$(CONFIG_INFINIBAND_HNS) += hns-roce.o
hns-roce-objs := hns_roce_main.o hns_roce_cmd.o hns_roce_pd.o \
hns_roce_ah.o hns_roce_hem.o hns_roce_mr.o hns_roce_qp.o \
- hns_roce_cq.o hns_roce_alloc.o
+ hns_roce_cq.o hns_roce_alloc.o hns_roce_db.o
obj-$(CONFIG_INFINIBAND_HNS_HIP06) += hns-roce-hw-v1.o
hns-roce-hw-v1-objs := hns_roce_hw_v1.o
obj-$(CONFIG_INFINIBAND_HNS_HIP08) += hns-roce-hw-v2.o
--- /dev/null
+++ b/drivers/infiniband/hw/hns/hns_roce_db.c
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
+/*
+ * Copyright (c) 2017 Hisilicon Limited.
+ * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
+ */
+
+#include <linux/platform_device.h>
+#include <rdma/ib_umem.h>
+#include "hns_roce_device.h"
+
+int hns_roce_db_map_user(struct hns_roce_ucontext *context, unsigned long virt,
+ struct hns_roce_db *db)
+{
+ struct hns_roce_user_db_page *page;
+ int ret = 0;
+
+ mutex_lock(&context->page_mutex);
+
+ list_for_each_entry(page, &context->page_list, list)
+ if (page->user_virt == (virt & PAGE_MASK))
+ goto found;
+
+ page = kmalloc(sizeof(*page), GFP_KERNEL);
+ if (!page) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ refcount_set(&page->refcount, 1);
+ page->user_virt = (virt & PAGE_MASK);
+ page->umem = ib_umem_get(&context->ibucontext, virt & PAGE_MASK,
+ PAGE_SIZE, 0, 0);
+ if (IS_ERR(page->umem)) {
+ ret = PTR_ERR(page->umem);
+ kfree(page);
+ goto out;
+ }
+
+ list_add(&page->list, &context->page_list);
+
+found:
+ db->dma = sg_dma_address(page->umem->sg_head.sgl) +
+ (virt & ~PAGE_MASK);
+ db->u.user_page = page;
+ refcount_inc(&page->refcount);
+
+out:
+ mutex_unlock(&context->page_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(hns_roce_db_map_user);
+
+void hns_roce_db_unmap_user(struct hns_roce_ucontext *context,
+ struct hns_roce_db *db)
+{
+ mutex_lock(&context->page_mutex);
+
+ refcount_dec(&db->u.user_page->refcount);
+ if (refcount_dec_if_one(&db->u.user_page->refcount)) {
+ list_del(&db->u.user_page->list);
+ ib_umem_release(db->u.user_page->umem);
+ kfree(db->u.user_page);
+ }
+
+ mutex_unlock(&context->page_mutex);
+}
+EXPORT_SYMBOL(hns_roce_db_unmap_user);
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -105,6 +105,10 @@
#define PAGES_SHIFT_24 24
#define PAGES_SHIFT_32 32
+enum {
+ HNS_ROCE_SUPPORT_RQ_RECORD_DB = 1 << 0,
+};
+
enum hns_roce_qp_state {
HNS_ROCE_QP_STATE_RST,
HNS_ROCE_QP_STATE_INIT,
@@ -178,7 +182,8 @@ enum {
enum {
HNS_ROCE_CAP_FLAG_REREG_MR = BIT(0),
HNS_ROCE_CAP_FLAG_ROCE_V1_V2 = BIT(1),
- HNS_ROCE_CAP_FLAG_RQ_INLINE = BIT(2)
+ HNS_ROCE_CAP_FLAG_RQ_INLINE = BIT(2),
+ HNS_ROCE_CAP_FLAG_RECORD_DB = BIT(3)
};
enum hns_roce_mtt_type {
@@ -186,6 +191,10 @@ enum hns_roce_mtt_type {
MTT_TYPE_CQE,
};
+enum {
+ HNS_ROCE_DB_PER_PAGE = PAGE_SIZE / 4
+};
+
#define HNS_ROCE_CMD_SUCCESS 1
#define HNS_ROCE_PORT_DOWN 0
@@ -203,6 +212,8 @@ struct hns_roce_uar {
struct hns_roce_ucontext {
struct ib_ucontext ibucontext;
struct hns_roce_uar uar;
+ struct list_head page_list;
+ struct mutex page_mutex;
};
struct hns_roce_pd {
@@ -335,6 +346,33 @@ struct hns_roce_buf {
int page_shift;
};
+struct hns_roce_db_pgdir {
+ struct list_head list;
+ DECLARE_BITMAP(order0, HNS_ROCE_DB_PER_PAGE);
+ DECLARE_BITMAP(order1, HNS_ROCE_DB_PER_PAGE / 2);
+ unsigned long *bits[2];
+ u32 *page;
+ dma_addr_t db_dma;
+};
+
+struct hns_roce_user_db_page {
+ struct list_head list;
+ struct ib_umem *umem;
+ unsigned long user_virt;
+ refcount_t refcount;
+};
+
+struct hns_roce_db {
+ u32 *db_record;
+ union {
+ struct hns_roce_db_pgdir *pgdir;
+ struct hns_roce_user_db_page *user_page;
+ } u;
+ dma_addr_t dma;
+ int index;
+ int order;
+};
+
struct hns_roce_cq_buf {
struct hns_roce_buf hr_buf;
struct hns_roce_mtt hr_mtt;
@@ -466,6 +504,8 @@ struct hns_roce_qp {
struct ib_qp ibqp;
struct hns_roce_buf hr_buf;
struct hns_roce_wq rq;
+ struct hns_roce_db rdb;
+ u8 rdb_en;
u32 doorbell_qpn;
__le32 sq_signal_bits;
u32 sq_next_wqe;
@@ -930,6 +970,10 @@ struct ib_cq *hns_roce_ib_create_cq(stru
int hns_roce_ib_destroy_cq(struct ib_cq *ib_cq);
void hns_roce_free_cq(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq);
+int hns_roce_db_map_user(struct hns_roce_ucontext *context, unsigned long virt,
+ struct hns_roce_db *db);
+void hns_roce_db_unmap_user(struct hns_roce_ucontext *context,
+ struct hns_roce_db *db);
void hns_roce_cq_completion(struct hns_roce_dev *hr_dev, u32 cqn);
void hns_roce_cq_event(struct hns_roce_dev *hr_dev, u32 cqn, int event_type);
void hns_roce_qp_event(struct hns_roce_dev *hr_dev, u32 qpn, int event_type);
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -1168,7 +1168,8 @@ static int hns_roce_v2_profile(struct hn
caps->flags = HNS_ROCE_CAP_FLAG_REREG_MR |
HNS_ROCE_CAP_FLAG_ROCE_V1_V2 |
- HNS_ROCE_CAP_FLAG_RQ_INLINE;
+ HNS_ROCE_CAP_FLAG_RQ_INLINE |
+ HNS_ROCE_CAP_FLAG_RECORD_DB;
caps->pkey_table_len[0] = 1;
caps->gid_table_len[0] = HNS_ROCE_V2_GID_INDEX_NUM;
caps->ceqe_depth = HNS_ROCE_V2_COMP_EQE_NUM;
@@ -2274,6 +2275,23 @@ static void modify_qp_reset_to_init(stru
hr_qp->qkey = attr->qkey;
}
+ if (hr_qp->rdb_en) {
+ roce_set_bit(context->byte_68_rq_db,
+ V2_QPC_BYTE_68_RQ_RECORD_EN_S, 1);
+ roce_set_bit(qpc_mask->byte_68_rq_db,
+ V2_QPC_BYTE_68_RQ_RECORD_EN_S, 0);
+ }
+
+ roce_set_field(context->byte_68_rq_db,
+ V2_QPC_BYTE_68_RQ_DB_RECORD_ADDR_M,
+ V2_QPC_BYTE_68_RQ_DB_RECORD_ADDR_S,
+ ((u32)hr_qp->rdb.dma) >> 1);
+ roce_set_field(qpc_mask->byte_68_rq_db,
+ V2_QPC_BYTE_68_RQ_DB_RECORD_ADDR_M,
+ V2_QPC_BYTE_68_RQ_DB_RECORD_ADDR_S, 0);
+ context->rq_db_record_addr = hr_qp->rdb.dma >> 32;
+ qpc_mask->rq_db_record_addr = 0;
+
roce_set_bit(context->byte_76_srqn_op_en, V2_QPC_BYTE_76_RQIE_S, 1);
roce_set_bit(qpc_mask->byte_76_srqn_op_en, V2_QPC_BYTE_76_RQIE_S, 0);
@@ -3211,6 +3229,8 @@ static int hns_roce_v2_modify_qp(struct
hr_qp->sq.tail = 0;
hr_qp->sq_next_wqe = 0;
hr_qp->next_sge = 0;
+ if (hr_qp->rq.wqe_cnt)
+ *hr_qp->rdb.db_record = 0;
}
out:
@@ -3437,6 +3457,10 @@ static int hns_roce_v2_destroy_qp_common
hns_roce_mtt_cleanup(hr_dev, &hr_qp->mtt);
if (is_user) {
+ if (hr_qp->rq.wqe_cnt && (hr_qp->rdb_en == 1))
+ hns_roce_db_unmap_user(
+ to_hr_ucontext(hr_qp->ibqp.uobject->context),
+ &hr_qp->rdb);
ib_umem_release(hr_qp->umem);
} else {
kfree(hr_qp->sq.wrid);
--- a/drivers/infiniband/hw/hns/hns_roce_main.c
+++ b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -351,6 +351,11 @@ static struct ib_ucontext *hns_roce_allo
if (ret)
goto error_fail_uar_alloc;
+ if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB) {
+ INIT_LIST_HEAD(&context->page_list);
+ mutex_init(&context->page_mutex);
+ }
+
ret = ib_copy_to_udata(udata, &resp, sizeof(resp));
if (ret)
goto error_fail_copy_to_udata;
--- a/drivers/infiniband/hw/hns/hns_roce_qp.c
+++ b/drivers/infiniband/hw/hns/hns_roce_qp.c
@@ -489,6 +489,15 @@ static int hns_roce_set_kernel_sq_size(s
return 0;
}
+static int hns_roce_qp_has_rq(struct ib_qp_init_attr *attr)
+{
+ if (attr->qp_type == IB_QPT_XRC_INI ||
+ attr->qp_type == IB_QPT_XRC_TGT || attr->srq)
+ return 0;
+
+ return 1;
+}
+
static int hns_roce_create_qp_common(struct hns_roce_dev *hr_dev,
struct ib_pd *ib_pd,
struct ib_qp_init_attr *init_attr,
@@ -497,6 +506,7 @@ static int hns_roce_create_qp_common(str
{
struct device *dev = hr_dev->dev;
struct hns_roce_ib_create_qp ucmd;
+ struct hns_roce_ib_create_qp_resp resp;
unsigned long qpn = 0;
int ret = 0;
u32 page_shift;
@@ -602,6 +612,18 @@ static int hns_roce_create_qp_common(str
dev_err(dev, "hns_roce_ib_umem_write_mtt error for create qp\n");
goto err_mtt;
}
+
+ if ((hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB) &&
+ (udata->outlen == sizeof(resp)) &&
+ hns_roce_qp_has_rq(init_attr)) {
+ ret = hns_roce_db_map_user(
+ to_hr_ucontext(ib_pd->uobject->context),
+ ucmd.db_addr, &hr_qp->rdb);
+ if (ret) {
+ dev_err(dev, "rp record doorbell map failed!\n");
+ goto err_mtt;
+ }
+ }
} else {
if (init_attr->create_flags &
IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK) {
@@ -698,17 +720,44 @@ static int hns_roce_create_qp_common(str
else
hr_qp->doorbell_qpn = cpu_to_le64(hr_qp->qpn);
+ if (ib_pd->uobject && (udata->outlen == sizeof(resp)) &&
+ (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB)) {
+
+ /* indicate kernel supports record db */
+ resp.cap_flags |= HNS_ROCE_SUPPORT_RQ_RECORD_DB;
+ ret = ib_copy_to_udata(udata, &resp, sizeof(resp));
+ if (ret)
+ goto err_qp;
+
+ hr_qp->rdb_en = 1;
+ }
hr_qp->event = hns_roce_ib_qp_event;
return 0;
+err_qp:
+ if (init_attr->qp_type == IB_QPT_GSI &&
+ hr_dev->hw_rev == HNS_ROCE_HW_VER1)
+ hns_roce_qp_remove(hr_dev, hr_qp);
+ else
+ hns_roce_qp_free(hr_dev, hr_qp);
+
err_qpn:
if (!sqpn)
hns_roce_release_range_qp(hr_dev, qpn, 1);
err_wrid:
- kfree(hr_qp->sq.wrid);
- kfree(hr_qp->rq.wrid);
+ if (ib_pd->uobject) {
+ if ((hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB) &&
+ (udata->outlen == sizeof(resp)) &&
+ hns_roce_qp_has_rq(init_attr))
+ hns_roce_db_unmap_user(
+ to_hr_ucontext(ib_pd->uobject->context),
+ &hr_qp->rdb);
+ } else {
+ kfree(hr_qp->sq.wrid);
+ kfree(hr_qp->rq.wrid);
+ }
err_mtt:
hns_roce_mtt_cleanup(hr_dev, &hr_qp->mtt);
--- a/include/uapi/rdma/hns-abi.h
+++ b/include/uapi/rdma/hns-abi.h
@@ -48,7 +48,12 @@ struct hns_roce_ib_create_qp {
__u8 reserved[5];
};
+struct hns_roce_ib_create_qp_resp {
+ __u64 cap_flags;
+};
+
struct hns_roce_ib_alloc_ucontext_resp {
__u32 qp_tab_size;
+ __u32 reserved;
};
#endif /* HNS_ABI_USER_H */