Implement the RDMA nldev netlink interface for dumping detailed
CQ information.
Signed-off-by: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/nldev.c | 172 +++++++++++++++++++++++++++++++++++++++
include/uapi/rdma/rdma_netlink.h | 8 ++
2 files changed, 180 insertions(+)
diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 13f5c46..34fb0d3 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -89,6 +89,11 @@
[RDMA_NLDEV_ATTR_RES_DEV_TYPE] = { .type = NLA_U8 },
[RDMA_NLDEV_ATTR_RES_TRANSPORT_TYPE] = { .type = NLA_U8 },
[RDMA_NLDEV_ATTR_RES_NETWORK_TYPE] = { .type = NLA_U8 },
+ [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)
@@ -396,6 +401,51 @@ static int fill_res_cm_id_entry(struct sk_buff *msg,
return -EMSGSIZE;
}
+static int fill_res_cq_entry(struct sk_buff *msg,
+ struct ib_cq *cq)
+{
+ struct rdma_restrack_entry *res = &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)
{
@@ -929,6 +979,125 @@ static int nldev_res_get_cm_id_dumpit(struct sk_buff *skb,
put_device(&device->dev);
return ret;
}
+
+static int nldev_res_get_cq_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct nlattr *tb[RDMA_NLDEV_ATTR_MAX];
+ struct rdma_restrack_entry *res;
+ int err, ret = 0, idx = 0;
+ struct nlattr *table_attr;
+ struct ib_device *device;
+ int start = cb->args[0];
+ struct ib_cq *cq = NULL;
+ struct nlmsghdr *nlh;
+ u32 index;
+
+ err = nlmsg_parse(cb->nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1,
+ nldev_policy, NULL);
+ /*
+ * Right now, we are expecting the device index to get CQ information,
+ * but it is possible to extend this code to return all devices in
+ * one shot by checking the existence of RDMA_NLDEV_ATTR_DEV_INDEX.
+ * if it doesn't exist, we will iterate over all devices.
+ *
+ * But it is not needed for now.
+ */
+ if (err || !tb[RDMA_NLDEV_ATTR_DEV_INDEX])
+ return -EINVAL;
+
+ index = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);
+ device = ib_device_get_by_index(index);
+ if (!device)
+ return -EINVAL;
+
+ nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+ RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_RES_CQ_GET),
+ 0, NLM_F_MULTI);
+
+ if (fill_nldev_handle(skb, device)) {
+ ret = -EMSGSIZE;
+ goto err;
+ }
+
+ table_attr = nla_nest_start(skb, RDMA_NLDEV_ATTR_RES_CQ);
+ if (!table_attr) {
+ ret = -EMSGSIZE;
+ goto err;
+ }
+
+ down_read(&device->res.rwsem);
+ hash_for_each_possible(device->res.hash, res, node, RDMA_RESTRACK_CQ) {
+ if (idx < start)
+ goto next;
+
+ if ((rdma_is_kernel_res(res) &&
+ task_active_pid_ns(current) != &init_pid_ns) ||
+ (!rdma_is_kernel_res(res) &&
+ task_active_pid_ns(current) !=
+ task_active_pid_ns(res->task)))
+ /*
+ * 1. Kernel CQs should be visible in init namspace only
+ * 2. Present only CQs visible in the current namespace
+ */
+ goto next;
+
+ if (!rdma_restrack_get(res))
+ /*
+ * Resource is under release now, but we are not
+ * relesing lock now, so it will be released in
+ * our next pass, once we will get ->next pointer.
+ */
+ goto next;
+
+ cq = container_of(res, struct ib_cq, res);
+
+ up_read(&device->res.rwsem);
+ ret = fill_res_cq_entry(skb, cq);
+ down_read(&device->res.rwsem);
+ /*
+ * Return resource back, but it won't be released till
+ * the &device->res.rwsem will be released for write.
+ */
+ rdma_restrack_put(res);
+
+ if (ret == -EMSGSIZE)
+ /*
+ * There is a chance to optimize here.
+ * It can be done by using list_prepare_entry
+ * and list_for_each_entry_continue afterwards.
+ */
+ break;
+ if (ret)
+ goto res_err;
+next: idx++;
+ }
+ up_read(&device->res.rwsem);
+
+ nla_nest_end(skb, table_attr);
+ nlmsg_end(skb, nlh);
+ cb->args[0] = idx;
+
+ /*
+ * No more CQs to fill, cancel the message and
+ * return 0 to mark end of dumpit.
+ */
+ if (!cq)
+ goto err;
+
+ put_device(&device->dev);
+ return skb->len;
+
+res_err:
+ nla_nest_cancel(skb, table_attr);
+ up_read(&device->res.rwsem);
+
+err:
+ nlmsg_cancel(skb, nlh);
+ put_device(&device->dev);
+ return ret;
+}
+
static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
[RDMA_NLDEV_CMD_GET] = {
.doit = nldev_get_doit,
@@ -958,6 +1127,9 @@ 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 13f0bed..fa677ef 100644
--- a/include/uapi/rdma/rdma_netlink.h
+++ b/include/uapi/rdma/rdma_netlink.h
@@ -242,6 +242,8 @@ 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
};
@@ -382,6 +384,12 @@ enum rdma_nldev_attr {
*/
RDMA_NLDEV_ATTR_RES_NETWORK_TYPE, /* u8 */
+ 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 */
--
1.8.3.1
--
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