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Message-ID: <20240806193317.1491822-10-kuba@kernel.org>
Date: Tue, 6 Aug 2024 12:33:14 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
michael.chan@...adcom.com,
shuah@...nel.org,
ecree.xilinx@...il.com,
przemyslaw.kitszel@...el.com,
ahmed.zaki@...el.com,
andrew@...n.ch,
willemb@...gle.com,
pavan.chebbi@...adcom.com,
petrm@...dia.com,
gal@...dia.com,
jdamato@...tly.com,
donald.hunter@...il.com,
Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v3 09/12] ethtool: rss: support dumping RSS contexts
Now that we track RSS contexts in the core we can easily dump
them. This is a major introspection improvement, as previously
the only way to find all contexts would be to try all ids
(of which there may be 2^32 - 1).
Don't use the XArray iterators (like xa_for_each_start()) as they
do not move the index past the end of the array once done, which
caused multiple bugs in Netlink dumps in the past.
Reviewed-by: Joe Damato <jdamato@...tly.com>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
v3:
- one_ifindex -> match_ifindex, add a comment
- add comment about context 0 not being in XArray
- extend commit message (XArray iterators)
---
Documentation/netlink/specs/ethtool.yaml | 9 +-
net/ethtool/netlink.c | 2 +
net/ethtool/netlink.h | 2 +
net/ethtool/rss.c | 135 +++++++++++++++++++++++
4 files changed, 146 insertions(+), 2 deletions(-)
diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml
index ea21fe135b97..cf69eedae51d 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -1749,12 +1749,12 @@ doc: Partial family for Ethtool Netlink.
attribute-set: rss
- do: &rss-get-op
+ do:
request:
attributes:
- header
- context
- reply:
+ reply: &rss-reply
attributes:
- header
- context
@@ -1762,6 +1762,11 @@ doc: Partial family for Ethtool Netlink.
- indir
- hkey
- input_xfrm
+ dump:
+ request:
+ attributes:
+ - header
+ reply: *rss-reply
-
name: plca-get-cfg
doc: Get PLCA params.
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index cb1eea00e349..041548e5f5e6 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -1128,6 +1128,8 @@ static const struct genl_ops ethtool_genl_ops[] = {
{
.cmd = ETHTOOL_MSG_RSS_GET,
.doit = ethnl_default_doit,
+ .start = ethnl_rss_dump_start,
+ .dumpit = ethnl_rss_dumpit,
.policy = ethnl_rss_get_policy,
.maxattr = ARRAY_SIZE(ethnl_rss_get_policy) - 1,
},
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 46ec273a87c5..919371383b23 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -464,6 +464,8 @@ int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info);
int ethnl_tunnel_info_start(struct netlink_callback *cb);
int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
int ethnl_act_module_fw_flash(struct sk_buff *skb, struct genl_info *info);
+int ethnl_rss_dump_start(struct netlink_callback *cb);
+int ethnl_rss_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
extern const char stats_std_names[__ETHTOOL_STATS_CNT][ETH_GSTRING_LEN];
extern const char stats_eth_phy_names[__ETHTOOL_A_STATS_ETH_PHY_CNT][ETH_GSTRING_LEN];
diff --git a/net/ethtool/rss.c b/net/ethtool/rss.c
index 023782ca1230..2865720ff583 100644
--- a/net/ethtool/rss.c
+++ b/net/ethtool/rss.c
@@ -208,6 +208,141 @@ static void rss_cleanup_data(struct ethnl_reply_data *reply_base)
kfree(data->indir_table);
}
+struct rss_nl_dump_ctx {
+ unsigned long ifindex;
+ unsigned long ctx_idx;
+
+ /* User wants to only dump contexts from given ifindex */
+ unsigned int match_ifindex;
+};
+
+static struct rss_nl_dump_ctx *rss_dump_ctx(struct netlink_callback *cb)
+{
+ NL_ASSERT_DUMP_CTX_FITS(struct rss_nl_dump_ctx);
+
+ return (struct rss_nl_dump_ctx *)cb->ctx;
+}
+
+int ethnl_rss_dump_start(struct netlink_callback *cb)
+{
+ const struct genl_info *info = genl_info_dump(cb);
+ struct rss_nl_dump_ctx *ctx = rss_dump_ctx(cb);
+ struct ethnl_req_info req_info = {};
+ struct nlattr **tb = info->attrs;
+ int ret;
+
+ /* Filtering by context not supported */
+ if (tb[ETHTOOL_A_RSS_CONTEXT]) {
+ NL_SET_BAD_ATTR(info->extack, tb[ETHTOOL_A_RSS_CONTEXT]);
+ return -EINVAL;
+ }
+
+ ret = ethnl_parse_header_dev_get(&req_info,
+ tb[ETHTOOL_A_RSS_HEADER],
+ sock_net(cb->skb->sk), cb->extack,
+ false);
+ if (req_info.dev) {
+ ctx->match_ifindex = req_info.dev->ifindex;
+ ctx->ifindex = ctx->match_ifindex;
+ ethnl_parse_header_dev_put(&req_info);
+ req_info.dev = NULL;
+ }
+
+ return ret;
+}
+
+static int
+rss_dump_one_ctx(struct sk_buff *skb, struct netlink_callback *cb,
+ struct net_device *dev, u32 rss_context)
+{
+ const struct genl_info *info = genl_info_dump(cb);
+ struct rss_reply_data data = {};
+ struct rss_req_info req = {};
+ void *ehdr;
+ int ret;
+
+ req.rss_context = rss_context;
+
+ ehdr = ethnl_dump_put(skb, cb, ETHTOOL_MSG_RSS_GET_REPLY);
+ if (!ehdr)
+ return -EMSGSIZE;
+
+ ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_RSS_HEADER);
+ if (ret < 0)
+ goto err_cancel;
+
+ /* Context 0 is not currently storred or cached in the XArray */
+ if (!rss_context)
+ ret = rss_prepare_get(&req, dev, &data, info);
+ else
+ ret = rss_prepare_ctx(&req, dev, &data, info);
+ if (ret)
+ goto err_cancel;
+
+ ret = rss_fill_reply(skb, &req.base, &data.base);
+ if (ret)
+ goto err_cleanup;
+ genlmsg_end(skb, ehdr);
+
+ rss_cleanup_data(&data.base);
+ return 0;
+
+err_cleanup:
+ rss_cleanup_data(&data.base);
+err_cancel:
+ genlmsg_cancel(skb, ehdr);
+ return ret;
+}
+
+static int
+rss_dump_one_dev(struct sk_buff *skb, struct netlink_callback *cb,
+ struct net_device *dev)
+{
+ struct rss_nl_dump_ctx *ctx = rss_dump_ctx(cb);
+ int ret;
+
+ if (!dev->ethtool_ops->get_rxfh)
+ return 0;
+
+ if (!ctx->ctx_idx) {
+ ret = rss_dump_one_ctx(skb, cb, dev, 0);
+ if (ret)
+ return ret;
+ ctx->ctx_idx++;
+ }
+
+ for (; xa_find(&dev->ethtool->rss_ctx, &ctx->ctx_idx,
+ ULONG_MAX, XA_PRESENT); ctx->ctx_idx++) {
+ ret = rss_dump_one_ctx(skb, cb, dev, ctx->ctx_idx);
+ if (ret)
+ return ret;
+ }
+ ctx->ctx_idx = 0;
+
+ return 0;
+}
+
+int ethnl_rss_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct rss_nl_dump_ctx *ctx = rss_dump_ctx(cb);
+ struct net *net = sock_net(skb->sk);
+ struct net_device *dev;
+ int ret = 0;
+
+ rtnl_lock();
+ for_each_netdev_dump(net, dev, ctx->ifindex) {
+ if (ctx->match_ifindex && ctx->match_ifindex != ctx->ifindex)
+ break;
+
+ ret = rss_dump_one_dev(skb, cb, dev);
+ if (ret)
+ break;
+ }
+ rtnl_unlock();
+
+ return ret;
+}
+
const struct ethnl_request_ops ethnl_rss_request_ops = {
.request_cmd = ETHTOOL_MSG_RSS_GET,
.reply_cmd = ETHTOOL_MSG_RSS_GET_REPLY,
--
2.45.2
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