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 Signed-off-by: Stanislav Fomichev sdf@fomichev.me --- tools/testing/selftests/net/Makefile | 2 +- tools/testing/selftests/net/ncdevmem.c | 57 +++++++++++++++++++++++++- 2 files changed, 56 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 26a4883a65c9..759b1d2dc8b4 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -111,7 +111,7 @@ 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 diff --git a/tools/testing/selftests/net/ncdevmem.c b/tools/testing/selftests/net/ncdevmem.c index 697771c1f9fa..e1faad46548b 100644 --- a/tools/testing/selftests/net/ncdevmem.c +++ b/tools/testing/selftests/net/ncdevmem.c @@ -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) @@ -370,6 +420,9 @@ 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");