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ethtool: rss: support skipping contexts during dump

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Applications may want to deal with dynamic RSS contexts only.
So dumping context 0 will be counter-productive for them.
Support starting the dump from a given context ID.

Alternative would be to implement a dump flag to skip just
context 0, not sure which is better...

Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2024-08-09 22:37:26 -07:00 committed by David S. Miller
parent f6122900f4
commit 3d50c66c06
5 changed files with 27 additions and 4 deletions
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4
Documentation/netlink/specs/ethtool.yaml
View File

@ -1028,6 +1028,9 @@ attribute-sets:
-
name: input_xfrm
type: u32
-
name: start-context
type: u32
-
name: plca
attributes:
@ -1766,6 +1769,7 @@ operations:
request:
attributes:
- header
- start-context
reply: *rss-reply
-
name: plca-get-cfg

12
Documentation/networking/ethtool-netlink.rst
View File

@ -1866,10 +1866,18 @@ RSS context of an interface similar to ``ETHTOOL_GRSSH`` ioctl request.
Request contents:
===================================== ====== ==========================
===================================== ====== ============================
``ETHTOOL_A_RSS_HEADER`` nested request header
``ETHTOOL_A_RSS_CONTEXT`` u32 context number
===================================== ====== ==========================
``ETHTOOL_A_RSS_START_CONTEXT`` u32 start context number (dumps)
===================================== ====== ============================
``ETHTOOL_A_RSS_CONTEXT`` specifies which RSS context number to query,
if not set context 0 (the main context) is queried. Dumps can be filtered
by device (only listing contexts of a given netdev). Filtering single
context number is not supported but ``ETHTOOL_A_RSS_START_CONTEXT``
can be used to start dumping context from the given number (primarily
used to ignore context 0s and only dump additional contexts).
Kernel response contents:

1
include/uapi/linux/ethtool_netlink.h
View File

@ -965,6 +965,7 @@ enum {
ETHTOOL_A_RSS_INDIR, /* binary */
ETHTOOL_A_RSS_HKEY, /* binary */
ETHTOOL_A_RSS_INPUT_XFRM, /* u32 */
ETHTOOL_A_RSS_START_CONTEXT, /* u32 */
__ETHTOOL_A_RSS_CNT,
ETHTOOL_A_RSS_MAX = (__ETHTOOL_A_RSS_CNT - 1),

2
net/ethtool/netlink.h
View File

@ -449,7 +449,7 @@ extern const struct nla_policy ethnl_module_get_policy[ETHTOOL_A_MODULE_HEADER +
extern const struct nla_policy ethnl_module_set_policy[ETHTOOL_A_MODULE_POWER_MODE_POLICY + 1];
extern const struct nla_policy ethnl_pse_get_policy[ETHTOOL_A_PSE_HEADER + 1];
extern const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1];
extern const struct nla_policy ethnl_rss_get_policy[ETHTOOL_A_RSS_CONTEXT + 1];
extern const struct nla_policy ethnl_rss_get_policy[ETHTOOL_A_RSS_START_CONTEXT + 1];
extern const struct nla_policy ethnl_plca_get_cfg_policy[ETHTOOL_A_PLCA_HEADER + 1];
extern const struct nla_policy ethnl_plca_set_cfg_policy[ETHTOOL_A_PLCA_MAX + 1];
extern const struct nla_policy ethnl_plca_get_status_policy[ETHTOOL_A_PLCA_HEADER + 1];

12
net/ethtool/rss.c
View File

@ -28,6 +28,7 @@ struct rss_reply_data {
const struct nla_policy ethnl_rss_get_policy[] = {
[ETHTOOL_A_RSS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
[ETHTOOL_A_RSS_CONTEXT] = { .type = NLA_U32 },
[ETHTOOL_A_RSS_START_CONTEXT] = { .type = NLA_U32 },
};
static int
@ -38,6 +39,10 @@ rss_parse_request(struct ethnl_req_info *req_info, struct nlattr **tb,
if (tb[ETHTOOL_A_RSS_CONTEXT])
request->rss_context = nla_get_u32(tb[ETHTOOL_A_RSS_CONTEXT]);
if (tb[ETHTOOL_A_RSS_START_CONTEXT]) {
NL_SET_BAD_ATTR(extack, tb[ETHTOOL_A_RSS_START_CONTEXT]);
return -EINVAL;
}
return 0;
}
@ -214,6 +219,7 @@ struct rss_nl_dump_ctx {
/* User wants to only dump contexts from given ifindex */
unsigned int match_ifindex;
unsigned int start_ctx;
};
static struct rss_nl_dump_ctx *rss_dump_ctx(struct netlink_callback *cb)
@ -236,6 +242,10 @@ int ethnl_rss_dump_start(struct netlink_callback *cb)
NL_SET_BAD_ATTR(info->extack, tb[ETHTOOL_A_RSS_CONTEXT]);
return -EINVAL;
}
if (tb[ETHTOOL_A_RSS_START_CONTEXT]) {
ctx->start_ctx = nla_get_u32(tb[ETHTOOL_A_RSS_START_CONTEXT]);
ctx->ctx_idx = ctx->start_ctx;
}
ret = ethnl_parse_header_dev_get(&req_info,
tb[ETHTOOL_A_RSS_HEADER],
@ -317,7 +327,7 @@ rss_dump_one_dev(struct sk_buff *skb, struct netlink_callback *cb,
if (ret)
return ret;
}
ctx->ctx_idx = 0;
ctx->ctx_idx = ctx->start_ctx;
return 0;
}