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Date: Mon, 13 Nov 2023 16:29:52 -0800
From: Amritha Nambiar <amritha.nambiar@...el.com>
To: netdev@...r.kernel.org, kuba@...nel.org, pabeni@...hat.com
Cc: sridhar.samudrala@...el.com, amritha.nambiar@...el.com
Subject: [net-next PATCH v7 04/10] netdev-genl: Add netlink framework
functions for queue
Implement the netdev netlink framework functions for
exposing queue information.
Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
---
net/core/netdev-genl.c | 181 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 178 insertions(+), 3 deletions(-)
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 336c608e6a6b..a3e308bf74d5 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -6,9 +6,23 @@
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/xdp.h>
+#include <net/netdev_rx_queue.h>
#include "netdev-genl-gen.h"
+struct netdev_nl_dump_ctx {
+ unsigned long ifindex;
+ unsigned int rxq_idx;
+ unsigned int txq_idx;
+};
+
+static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb)
+{
+ NL_ASSERT_DUMP_CTX_FITS(struct netdev_nl_dump_ctx);
+
+ return (struct netdev_nl_dump_ctx *)cb->ctx;
+}
+
static int
netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
const struct genl_info *info)
@@ -111,12 +125,13 @@ int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
+ struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
struct net *net = sock_net(skb->sk);
struct net_device *netdev;
int err = 0;
rtnl_lock();
- for_each_netdev_dump(net, netdev, cb->args[0]) {
+ for_each_netdev_dump(net, netdev, ctx->ifindex) {
err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb));
if (err < 0)
break;
@@ -129,14 +144,174 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}
+static int
+netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev,
+ u32 q_idx, u32 q_type, const struct genl_info *info)
+{
+ struct netdev_rx_queue *rxq;
+ struct netdev_queue *txq;
+ void *hdr;
+
+ hdr = genlmsg_iput(rsp, info);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ if (nla_put_u32(rsp, NETDEV_A_QUEUE_QUEUE_ID, q_idx) ||
+ nla_put_u32(rsp, NETDEV_A_QUEUE_QUEUE_TYPE, q_type) ||
+ nla_put_u32(rsp, NETDEV_A_QUEUE_IFINDEX, netdev->ifindex))
+ goto nla_put_failure;
+
+ switch (q_type) {
+ case NETDEV_QUEUE_TYPE_RX:
+ rxq = __netif_get_rx_queue(netdev, q_idx);
+ if (rxq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID,
+ rxq->napi->napi_id))
+ goto nla_put_failure;
+ break;
+ case NETDEV_QUEUE_TYPE_TX:
+ txq = netdev_get_tx_queue(netdev, q_idx);
+ if (txq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID,
+ txq->napi->napi_id))
+ goto nla_put_failure;
+ }
+
+ genlmsg_end(rsp, hdr);
+
+ return 0;
+
+nla_put_failure:
+ genlmsg_cancel(rsp, hdr);
+ return -EMSGSIZE;
+}
+
+static int netdev_nl_queue_validate(struct net_device *netdev, u32 q_id,
+ u32 q_type)
+{
+ switch (q_type) {
+ case NETDEV_QUEUE_TYPE_RX:
+ if (q_id >= netdev->real_num_rx_queues)
+ return -EINVAL;
+ return 0;
+ case NETDEV_QUEUE_TYPE_TX:
+ if (q_id >= netdev->real_num_tx_queues)
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int
+netdev_nl_queue_fill(struct sk_buff *rsp, struct net_device *netdev, u32 q_idx,
+ u32 q_type, const struct genl_info *info)
+{
+ int err;
+
+ err = netdev_nl_queue_validate(netdev, q_idx, q_type);
+ if (err)
+ return err;
+
+ return netdev_nl_queue_fill_one(rsp, netdev, q_idx, q_type, info);
+}
+
int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info)
{
- return -EOPNOTSUPP;
+ u32 q_id, q_type, ifindex;
+ struct net_device *netdev;
+ struct sk_buff *rsp;
+ int err;
+
+ if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_QUEUE_ID) ||
+ GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_QUEUE_TYPE) ||
+ GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_IFINDEX))
+ return -EINVAL;
+
+ q_id = nla_get_u32(info->attrs[NETDEV_A_QUEUE_QUEUE_ID]);
+ q_type = nla_get_u32(info->attrs[NETDEV_A_QUEUE_QUEUE_TYPE]);
+ ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
+
+ rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!rsp)
+ return -ENOMEM;
+
+ rtnl_lock();
+
+ netdev = __dev_get_by_index(genl_info_net(info), ifindex);
+ if (netdev)
+ err = netdev_nl_queue_fill(rsp, netdev, q_id, q_type, info);
+ else
+ err = -ENODEV;
+
+ rtnl_unlock();
+
+ if (err)
+ goto err_free_msg;
+
+ return genlmsg_reply(rsp, info);
+
+err_free_msg:
+ nlmsg_free(rsp);
+ return err;
+}
+
+static int
+netdev_nl_queue_dump_one(struct net_device *netdev, struct sk_buff *rsp,
+ const struct genl_info *info,
+ struct netdev_nl_dump_ctx *ctx)
+{
+ int err = 0;
+ int i;
+
+ for (i = ctx->rxq_idx; i < netdev->real_num_rx_queues;) {
+ err = netdev_nl_queue_fill_one(rsp, netdev, i,
+ NETDEV_QUEUE_TYPE_RX, info);
+ if (err)
+ return err;
+ ctx->rxq_idx = i++;
+ }
+ for (i = ctx->txq_idx; i < netdev->real_num_tx_queues;) {
+ err = netdev_nl_queue_fill_one(rsp, netdev, i,
+ NETDEV_QUEUE_TYPE_TX, info);
+ if (err)
+ return err;
+ ctx->txq_idx = i++;
+ }
+
+ return err;
}
int netdev_nl_queue_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
- return -EOPNOTSUPP;
+ struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
+ const struct genl_info *info = genl_info_dump(cb);
+ struct net *net = sock_net(skb->sk);
+ struct net_device *netdev;
+ u32 ifindex = 0;
+ int err = 0;
+
+ if (info->attrs[NETDEV_A_QUEUE_IFINDEX])
+ ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
+
+ rtnl_lock();
+ if (ifindex) {
+ netdev = __dev_get_by_index(net, ifindex);
+ if (netdev)
+ err = netdev_nl_queue_dump_one(netdev, skb, info, ctx);
+ else
+ err = -ENODEV;
+ } else {
+ for_each_netdev_dump(net, netdev, ctx->ifindex) {
+ err = netdev_nl_queue_dump_one(netdev, skb, info, ctx);
+ if (err < 0)
+ break;
+ ctx->rxq_idx = 0;
+ ctx->txq_idx = 0;
+ }
+ }
+ rtnl_unlock();
+
+ if (err != -EMSGSIZE)
+ return err;
+
+ return skb->len;
}
static int netdev_genl_netdevice_event(struct notifier_block *nb,
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