[PATCH 04/12] net: mana: Add functions for allocating doorbell page from GDMA

longli
2022-05-17T09:07:09Z

From: Long Li <longli@microsoft.com>

The RDMA device needs to allocate doorbell pages for each user context.
Implement those functions and expose them for use by the RDMA driver.

Signed-off-by: Long Li <longli@microsoft.com>
---
drivers/net/ethernet/microsoft/mana/gdma.h | 29 ++++++++++
.../net/ethernet/microsoft/mana/gdma_main.c | 54 +++++++++++++++++++
2 files changed, 83 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma.h b/drivers/net/ethernet/microsoft/mana/gdma.h
index c724ca410fcb..f945755760dc 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma.h
+++ b/drivers/net/ethernet/microsoft/mana/gdma.h
@@ -22,11 +22,15 @@ enum gdma_request_type {
GDMA_GENERATE_TEST_EQE = 10,
GDMA_CREATE_QUEUE = 12,
GDMA_DISABLE_QUEUE = 13,
+ GDMA_ALLOCATE_RESOURCE_RANGE = 22,
+ GDMA_DESTROY_RESOURCE_RANGE = 24,
GDMA_CREATE_DMA_REGION = 25,
GDMA_DMA_REGION_ADD_PAGES = 26,
GDMA_DESTROY_DMA_REGION = 27,
};

+#define GDMA_RESOURCE_DOORBELL_PAGE 27
+
enum gdma_queue_type {
GDMA_INVALID_QUEUE,
GDMA_SQ,
@@ -568,6 +572,26 @@ struct gdma_register_device_resp {
u32 db_id;
}; /* HW DATA */

+struct gdma_allocate_resource_range_req {
+ struct gdma_req_hdr hdr;
+ u32 resource_type;
+ u32 num_resources;
+ u32 alignment;
+ u32 allocated_resources;
+};
+
+struct gdma_allocate_resource_range_resp {
+ struct gdma_resp_hdr hdr;
+ u32 allocated_resources;
+};
+
+struct gdma_destroy_resource_range_req {
+ struct gdma_req_hdr hdr;
+ u32 resource_type;
+ u32 num_resources;
+ u32 allocated_resources;
+};
+
/* GDMA_CREATE_QUEUE */
struct gdma_create_queue_req {
struct gdma_req_hdr hdr;
@@ -676,4 +700,9 @@ void mana_gd_free_memory(struct gdma_mem_info *gmi);

int mana_gd_send_request(struct gdma_context *gc, u32 req_len, const void *req,
u32 resp_len, void *resp);
+
+int mana_gd_allocate_doorbell_page(struct gdma_context *gc, int *doorbell_page);
+
+int mana_gd_destroy_doorbell_page(struct gdma_context *gc, int doorbell_page);
+
#endif /* _GDMA_H */
diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 9fafaa0c8e76..86ffe0e39df0 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -153,6 +153,60 @@ void mana_gd_free_memory(struct gdma_mem_info *gmi)
gmi->dma_handle);
}

+int mana_gd_destroy_doorbell_page(struct gdma_context *gc, int doorbell_page)
+{
+ struct gdma_destroy_resource_range_req req = {};
+ struct gdma_resp_hdr resp = {};
+ int err;
+
+ mana_gd_init_req_hdr(&req.hdr, GDMA_DESTROY_RESOURCE_RANGE,
+ sizeof(req), sizeof(resp));
+
+ req.resource_type = GDMA_RESOURCE_DOORBELL_PAGE;
+ req.num_resources = 1;
+ req.allocated_resources = doorbell_page;
+
+ err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
+ if (err || resp.status) {
+ dev_err(gc->dev,
+ "Failed to destroy doorbell page: ret %d, 0x%x\n",
+ err, resp.status);
+ return err ? err : -EPROTO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(mana_gd_destroy_doorbell_page);
+
+int mana_gd_allocate_doorbell_page(struct gdma_context *gc,
+ int *doorbell_page)
+{
+ struct gdma_allocate_resource_range_req req = {};
+ struct gdma_allocate_resource_range_resp resp = {};
+ int err;
+
+ mana_gd_init_req_hdr(&req.hdr, GDMA_ALLOCATE_RESOURCE_RANGE,
+ sizeof(req), sizeof(resp));
+
+ req.resource_type = GDMA_RESOURCE_DOORBELL_PAGE;
+ req.num_resources = 1;
+ req.alignment = 0;
+ req.allocated_resources = 0; // have GDMA start searching from 0
+
+ err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
+ if (err || resp.hdr.status) { // resp.hdr.status should be >=0
+ dev_err(gc->dev,
+ "Failed to allocate doorbell page: ret %d, 0x%x\n",
+ err, resp.hdr.status);
+ return err ? err : -EPROTO;
+ }
+
+ *doorbell_page = resp.allocated_resources;
+
+ return 0;
+}
+EXPORT_SYMBOL(mana_gd_allocate_doorbell_page);
+
static int mana_gd_create_hw_eq(struct gdma_context *gc,
struct gdma_queue *queue)
{
--
2.17.1