[PATCH rdma-next v2 08/13] RDMA/nldev: Allow optional-counter status configuration through RDMA netlink

Leon Romanovsky
2021-09-30T08:04:50Z

Provide an option to allow users to enable/disable optional counters
through RDMA netlink. Limiting it to users with ADMIN capability only.

Examples:
1. Enable optional counters cc_rx_ce_pkts and cc_rx_cnp_pkts (and
disable all others):
$ sudo rdma statistic set link rocep8s0f0/1 optional-counters \
cc_rx_ce_pkts,cc_rx_cnp_pkts

2. Remove all optional counters:
$ sudo rdma statistic unset link rocep8s0f0/1 optional-counters

Signed-off-by: Aharon Landau <aharonl@nvidia.com>
Reviewed-by: Mark Zhang <markzhang@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
drivers/infiniband/core/nldev.c | 121 ++++++++++++++++++++++++--------
1 file changed, 91 insertions(+), 30 deletions(-)

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 210057fef7bd..2cf3e85470c4 100644
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -1897,42 +1897,68 @@ static int nldev_set_sys_set_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
return err;
}

-static int nldev_stat_set_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
- struct netlink_ext_ack *extack)
+static int nldev_stat_set_counter_dynamic_doit(struct nlattr *tb[],
+ struct ib_device *device,
+ u32 port)
{
- u32 index, port, mode, mask = 0, qpn, cntn = 0;
- struct nlattr *tb[RDMA_NLDEV_ATTR_MAX];
- struct ib_device *device;
- struct sk_buff *msg;
- int ret;
+ struct rdma_hw_stats *stats;
+ int rem, i, index, ret = 0;
+ struct nlattr *entry_attr;
+ unsigned long *target;

- ret = nlmsg_parse(nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1,
- nldev_policy, extack);
- /* Currently only counter for QP is supported */
- if (ret || !tb[RDMA_NLDEV_ATTR_STAT_RES] ||
- !tb[RDMA_NLDEV_ATTR_DEV_INDEX] ||
- !tb[RDMA_NLDEV_ATTR_PORT_INDEX] || !tb[RDMA_NLDEV_ATTR_STAT_MODE])
+ stats = ib_get_hw_stats_port(device, port);
+ if (!stats)
return -EINVAL;

- if (nla_get_u32(tb[RDMA_NLDEV_ATTR_STAT_RES]) != RDMA_NLDEV_ATTR_RES_QP)
- return -EINVAL;
+ target = kcalloc(BITS_TO_LONGS(stats->num_counters),
+ sizeof(long), GFP_KERNEL);
+ if (!target)
+ return -ENOMEM;

- index = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);
- device = ib_device_get_by_index(sock_net(skb->sk), index);
- if (!device)
- return -EINVAL;
+ nla_for_each_nested(entry_attr,
+ tb[RDMA_NLDEV_ATTR_STAT_HWCOUNTERS], rem) {
+ index = nla_get_u32(entry_attr);
+ if ((index >= stats->num_counters) ||
+ !(stats->descs[index].flags & IB_STAT_FLAG_OPTIONAL)) {
+ ret = -EINVAL;
+ goto out;
+ }

- port = nla_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]);
- if (!rdma_is_port_valid(device, port)) {
- ret = -EINVAL;
- goto err;
+ set_bit(index, target);
}

- msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
- if (!msg) {
- ret = -ENOMEM;
- goto err;
+ for (i = 0; i < stats->num_counters; i++) {
+ if (!(stats->descs[i].flags & IB_STAT_FLAG_OPTIONAL))
+ continue;
+
+ ret = rdma_counter_modify(device, port, i,
+ test_bit(i, target));
+ if (ret)
+ goto out;
}
+
+out:
+ kfree(target);
+ return ret;
+}
+
+static int nldev_stat_set_mode_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack,
+ struct nlattr *tb[],
+ struct ib_device *device, u32 port)
+{
+ u32 mode, mask = 0, qpn, cntn = 0;
+ struct sk_buff *msg;
+ int ret;
+
+ /* Currently only counter for QP is supported */
+ if (nla_get_u32(tb[RDMA_NLDEV_ATTR_STAT_RES]) != RDMA_NLDEV_ATTR_RES_QP)
+ return -EINVAL;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
nlh = nlmsg_put(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
RDMA_NL_GET_TYPE(RDMA_NL_NLDEV,
RDMA_NLDEV_CMD_STAT_SET),
@@ -1947,8 +1973,10 @@ static int nldev_stat_set_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
if (ret)
goto err_msg;
} else {
- if (!tb[RDMA_NLDEV_ATTR_RES_LQPN])
+ if (!tb[RDMA_NLDEV_ATTR_RES_LQPN]) {
+ ret = -EINVAL;
goto err_msg;
+ }
qpn = nla_get_u32(tb[RDMA_NLDEV_ATTR_RES_LQPN]);
if (tb[RDMA_NLDEV_ATTR_STAT_COUNTER_ID]) {
cntn = nla_get_u32(tb[RDMA_NLDEV_ATTR_STAT_COUNTER_ID]);
@@ -1970,14 +1998,47 @@ static int nldev_stat_set_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
}

nlmsg_end(msg, nlh);
- ib_device_put(device);
return rdma_nl_unicast(sock_net(skb->sk), msg, NETLINK_CB(skb).portid);

err_fill:
rdma_counter_unbind_qpn(device, port, qpn, cntn);
err_msg:
nlmsg_free(msg);
-err:
+ return ret;
+}
+
+static int nldev_stat_set_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[RDMA_NLDEV_ATTR_MAX];
+ struct ib_device *device;
+ u32 index, port;
+ int ret;
+
+ ret = nlmsg_parse(nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1, nldev_policy,
+ extack);
+ if (ret)
+ return -EINVAL;
+
+ index = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);
+ device = ib_device_get_by_index(sock_net(skb->sk), index);
+ if (!device)
+ return -EINVAL;
+
+ port = nla_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]);
+ if (!rdma_is_port_valid(device, port)) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ if (tb[RDMA_NLDEV_ATTR_STAT_MODE])
+ ret = nldev_stat_set_mode_doit(skb, nlh, extack, tb, device,
+ port);
+ else if (tb[RDMA_NLDEV_ATTR_STAT_HWCOUNTER_DYNAMIC])
+ ret = nldev_stat_set_counter_dynamic_doit(tb, device, port);
+ else
+ ret = -EINVAL;
+end:
ib_device_put(device);
return ret;
}
--
2.31.1