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selftests: ncdevmem: Use YNL to enable TCP header split

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In the next patch the hard-coded queue numbers are gonna be removed.
So introduce some initial support for ethtool YNL and use
it to enable header split.

Also, tcp-data-split requires latest ethtool which is unlikely
to be present in the distros right now.

(ideally, we should not shell out to ethtool at all).

Reviewed-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20241107181211.3934153-9-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stanislav Fomichev 2024-11-07 10:12:07 -08:00 • committed by Jakub Kicinski
parent e3c09623a5
commit 798d822e5d
2 changed files with 56 additions and 3 deletions
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2
tools/testing/selftests/net/Makefile
View file

@ -112,7 +112,7 @@ TEST_INCLUDES := forwarding/lib.sh
include ../lib.mk
# YNL build
YNL_GENS := netdev
YNL_GENS := ethtool netdev
include ynl.mk
$(OUTPUT)/epoll_busy_poll: LDLIBS += -lcap

57
tools/testing/selftests/net/ncdevmem.c
View file

@ -55,10 +55,12 @@
#include <linux/netlink.h>
#include <linux/genetlink.h>
#include <linux/netdev.h>
#include <linux/ethtool_netlink.h>
#include <time.h>
#include <net/if.h>
#include "netdev-user.h"
#include "ethtool-user.h"
#include <ynl.h>
#define PAGE_SHIFT 12
@ -231,10 +233,58 @@ static int reset_flow_steering(void)
return 0;
}
static const char *tcp_data_split_str(int val)
{
switch (val) {
case 0:
return "off";
case 1:
return "auto";
case 2:
return "on";
default:
return "?";
}
}
static int configure_headersplit(bool on)
{
return run_command("sudo ethtool -G %s tcp-data-split %s >&2", ifname,
on ? "on" : "off");
struct ethtool_rings_get_req *get_req;
struct ethtool_rings_get_rsp *get_rsp;
struct ethtool_rings_set_req *req;
struct ynl_error yerr;
struct ynl_sock *ys;
int ret;
ys = ynl_sock_create(&ynl_ethtool_family, &yerr);
if (!ys) {
fprintf(stderr, "YNL: %s\n", yerr.msg);
return -1;
}
req = ethtool_rings_set_req_alloc();
ethtool_rings_set_req_set_header_dev_index(req, ifindex);
/* 0 - off, 1 - auto, 2 - on */
ethtool_rings_set_req_set_tcp_data_split(req, on ? 2 : 0);
ret = ethtool_rings_set(ys, req);
if (ret < 0)
fprintf(stderr, "YNL failed: %s\n", ys->err.msg);
ethtool_rings_set_req_free(req);
if (ret == 0) {
get_req = ethtool_rings_get_req_alloc();
ethtool_rings_get_req_set_header_dev_index(get_req, ifindex);
get_rsp = ethtool_rings_get(ys, get_req);
ethtool_rings_get_req_free(get_req);
if (get_rsp)
fprintf(stderr, "TCP header split: %s\n",
tcp_data_split_str(get_rsp->tcp_data_split));
ethtool_rings_get_rsp_free(get_rsp);
}
ynl_sock_destroy(ys);
return ret;
}
static int configure_rss(void)
@ -382,6 +432,9 @@ int do_server(struct memory_buffer *mem)
if (reset_flow_steering())
error(1, 0, "Failed to reset flow steering\n");
if (configure_headersplit(1))
error(1, 0, "Failed to enable TCP header split\n");
/* Configure RSS to divert all traffic from our devmem queues */
if (configure_rss())
error(1, 0, "Failed to configure rss\n");