[v3,rdma-next,05/10] RDMA/nldev: provide detailed CQ information

Commit Message

Steve Wise Feb. 26, 2018, 11:22 p.m. UTC

Implement the RDMA nldev netlink interface for dumping detailed
CQ information.

Reviewed-by: Leon Romanovsky <[e-mail]>
Signed-off-by: Steve Wise <[e-mail]>
---
 drivers/infiniband/core/nldev.c  | 66 ++++++++++++++++++++++++++++++++++++++++
 include/uapi/rdma/rdma_netlink.h |  8 +++++
 2 files changed, 74 insertions(+)

Patch

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 46ce553..b68b35c 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -80,6 +80,11 @@ 
 			.len = sizeof(struct __kernel_sockaddr_storage) },
 	[RDMA_NLDEV_ATTR_RES_DST_ADDR]	= {
 			.len = sizeof(struct __kernel_sockaddr_storage) },
+	[RDMA_NLDEV_ATTR_RES_CQ]		= { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_RES_CQ_ENTRY]		= { .type = NLA_NESTED },
+	[RDMA_NLDEV_ATTR_RES_CQE]		= { .type = NLA_U32 },
+	[RDMA_NLDEV_ATTR_RES_USECNT]		= { .type = NLA_U64 },
+	[RDMA_NLDEV_ATTR_RES_POLL_CTX]		= { .type = NLA_U8 },
 };
 
 static int fill_nldev_handle(struct sk_buff *msg, struct ib_device *device)
@@ -354,6 +359,51 @@  static int fill_res_cm_id_entry(struct sk_buff *msg,
 	return -EMSGSIZE;
 }
 
+static int fill_res_cq_entry(struct sk_buff *msg, struct netlink_callback *cb,
+			     struct rdma_restrack_entry *res, uint32_t port)
+{
+	struct ib_cq *cq = container_of(res, struct ib_cq, res);
+	struct nlattr *entry_attr;
+
+	entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_CQ_ENTRY);
+	if (!entry_attr)
+		goto out;
+
+	if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_CQE, cq->cqe))
+		goto err;
+	if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_RES_USECNT,
+			      atomic_read(&cq->usecnt), 0))
+		goto err;
+
+	/* Poll context is only valid for kernel CQs */
+	if (rdma_is_kernel_res(res) &&
+	    nla_put_u8(msg, RDMA_NLDEV_ATTR_RES_POLL_CTX, cq->poll_ctx))
+		goto err;
+
+	/*
+	 * Existence of task means that it is user CQ and netlink
+	 * user is invited to go and read /proc/PID/comm to get name
+	 * of the task file and res->task_com should be NULL.
+	 */
+	if (rdma_is_kernel_res(res)) {
+		if (nla_put_string(msg, RDMA_NLDEV_ATTR_RES_KERN_NAME,
+				   res->kern_name))
+			goto err;
+	} else {
+		if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_PID,
+				task_pid_vnr(res->task)))
+			goto err;
+	}
+
+	nla_nest_end(msg, entry_attr);
+	return 0;
+
+err:
+	nla_nest_cancel(msg, entry_attr);
+out:
+	return -EMSGSIZE;
+}
+
 static int nldev_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
 			  struct netlink_ext_ack *extack)
 {
@@ -783,6 +833,12 @@  static int res_get_common_dumpit(struct sk_buff *skb,
 		.nldev_cmd = RDMA_NLDEV_CMD_RES_CM_ID_GET,
 		.nldev_attr = RDMA_NLDEV_ATTR_RES_CM_ID,
 	},
+	[RDMA_RESTRACK_CQ] = {
+		.fill_res_func = fill_res_cq_entry,
+		.res_type = RDMA_RESTRACK_CQ,
+		.nldev_cmd = RDMA_NLDEV_CMD_RES_CQ_GET,
+		.nldev_attr = RDMA_NLDEV_ATTR_RES_CQ,
+	},
 };
 
 static int nldev_res_get_qp_dumpit(struct sk_buff *skb,
@@ -798,6 +854,13 @@  static int nldev_res_get_cm_id_dumpit(struct sk_buff *skb,
 				     &fill_entries[RDMA_RESTRACK_CM_ID]);
 }
 
+static int nldev_res_get_cq_dumpit(struct sk_buff *skb,
+				   struct netlink_callback *cb)
+{
+	return res_get_common_dumpit(skb, cb,
+				     &fill_entries[RDMA_RESTRACK_CQ]);
+}
+
 static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
 	[RDMA_NLDEV_CMD_GET] = {
 		.doit = nldev_get_doit,
@@ -827,6 +890,9 @@  static int nldev_res_get_cm_id_dumpit(struct sk_buff *skb,
 	[RDMA_NLDEV_CMD_RES_CM_ID_GET] = {
 		.dump = nldev_res_get_cm_id_dumpit,
 	},
+	[RDMA_NLDEV_CMD_RES_CQ_GET] = {
+		.dump = nldev_res_get_cq_dumpit,
+	},
 };
 
 void __init nldev_init(void)
diff --git a/include/uapi/rdma/rdma_netlink.h b/include/uapi/rdma/rdma_netlink.h
index 0399aed..36cf1f0 100644
--- a/include/uapi/rdma/rdma_netlink.h
+++ b/include/uapi/rdma/rdma_netlink.h
@@ -240,6 +240,8 @@  enum rdma_nldev_command {
 
 	RDMA_NLDEV_CMD_RES_CM_ID_GET, /* can dump */
 
+	RDMA_NLDEV_CMD_RES_CQ_GET, /* can dump */
+
 	RDMA_NLDEV_NUM_OPS
 };
 
@@ -364,6 +366,12 @@  enum rdma_nldev_attr {
 	RDMA_NLDEV_ATTR_RES_SRC_ADDR,		/* __kernel_sockaddr_storage */
 	RDMA_NLDEV_ATTR_RES_DST_ADDR,		/* __kernel_sockaddr_storage */
 
+	RDMA_NLDEV_ATTR_RES_CQ,			/* nested table */
+	RDMA_NLDEV_ATTR_RES_CQ_ENTRY,		/* nested table */
+	RDMA_NLDEV_ATTR_RES_CQE,		/* u32 */
+	RDMA_NLDEV_ATTR_RES_USECNT,		/* u64 */
+	RDMA_NLDEV_ATTR_RES_POLL_CTX,		/* u8 */
+
 	RDMA_NLDEV_ATTR_MAX
 };
 #endif /* _UAPI_RDMA_NETLINK_H */