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Date: Wed, 14 Feb 2018 10:55:17 +0200
From: Arkadi Sharshevsky <arkadis@...lanox.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, stephen@...workplumber.org,
dsa@...ulusnetworks.com, mlxsw@...lanox.com,
Arkadi Sharshevsky <arkadis@...lanox.com>
Subject: [PATCH iproute2 2/7] devlink: mnlg: Add support for extended ack
Add support for extended ack.
Signed-off-by: Arkadi Sharshevsky <arkadis@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
devlink/mnlg.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++--
include/libnetlink.h | 1 +
lib/libnetlink.c | 4 ++--
3 files changed, 54 insertions(+), 4 deletions(-)
diff --git a/devlink/mnlg.c b/devlink/mnlg.c
index 9e27de2..37c5687 100644
--- a/devlink/mnlg.c
+++ b/devlink/mnlg.c
@@ -18,6 +18,8 @@
#include <libmnl/libmnl.h>
#include <linux/genetlink.h>
+#include "libnetlink.h"
+#include "utils.h"
#include "mnlg.h"
struct mnlg_socket {
@@ -60,6 +62,39 @@ int mnlg_socket_send(struct mnlg_socket *nlg, const struct nlmsghdr *nlh)
return mnl_socket_sendto(nlg->nl, nlh, nlh->nlmsg_len);
}
+static int mnlg_cb_noop(const struct nlmsghdr *nlh, void *data)
+{
+ return MNL_CB_OK;
+}
+
+static int mnlg_cb_error(const struct nlmsghdr *nlh, void *data)
+{
+ const struct nlmsgerr *err = mnl_nlmsg_get_payload(nlh);
+
+ if (nl_dump_ext_ack(nlh, NULL))
+ return MNL_CB_STOP;
+
+ /* Netlink subsystems returns the errno value with different signess */
+ if (err->error < 0)
+ errno = -err->error;
+ else
+ errno = err->error;
+
+ return err->error == 0 ? MNL_CB_STOP : MNL_CB_ERROR;
+}
+
+static int mnlg_cb_stop(const struct nlmsghdr *nlh, void *data)
+{
+ return MNL_CB_STOP;
+}
+
+static mnl_cb_t mnlg_cb_array[NLMSG_MIN_TYPE] = {
+ [NLMSG_NOOP] = mnlg_cb_noop,
+ [NLMSG_ERROR] = mnlg_cb_error,
+ [NLMSG_DONE] = mnlg_cb_stop,
+ [NLMSG_OVERRUN] = mnlg_cb_noop,
+};
+
int mnlg_socket_recv_run(struct mnlg_socket *nlg, mnl_cb_t data_cb, void *data)
{
int err;
@@ -69,8 +104,9 @@ int mnlg_socket_recv_run(struct mnlg_socket *nlg, mnl_cb_t data_cb, void *data)
MNL_SOCKET_BUFFER_SIZE);
if (err <= 0)
break;
- err = mnl_cb_run(nlg->buf, err, nlg->seq, nlg->portid,
- data_cb, data);
+ err = mnl_cb_run2(nlg->buf, err, nlg->seq, nlg->portid,
+ data_cb, data, mnlg_cb_array,
+ ARRAY_SIZE(mnlg_cb_array));
} while (err > 0);
return err;
@@ -220,6 +256,7 @@ struct mnlg_socket *mnlg_socket_open(const char *family_name, uint8_t version)
{
struct mnlg_socket *nlg;
struct nlmsghdr *nlh;
+ int one = 1;
int err;
nlg = malloc(sizeof(*nlg));
@@ -234,6 +271,16 @@ struct mnlg_socket *mnlg_socket_open(const char *family_name, uint8_t version)
if (!nlg->nl)
goto err_mnl_socket_open;
+ err = mnl_socket_setsockopt(nlg->nl, NETLINK_CAP_ACK, &one,
+ sizeof(one));
+ if (err)
+ goto err_mnl_set_ack;
+
+ err = mnl_socket_setsockopt(nlg->nl, NETLINK_EXT_ACK, &one,
+ sizeof(one));
+ if (err)
+ goto err_mnl_set_ext_ack;
+
err = mnl_socket_bind(nlg->nl, 0, MNL_SOCKET_AUTOPID);
if (err < 0)
goto err_mnl_socket_bind;
@@ -258,6 +305,8 @@ struct mnlg_socket *mnlg_socket_open(const char *family_name, uint8_t version)
err_mnlg_socket_recv_run:
err_mnlg_socket_send:
err_mnl_socket_bind:
+err_mnl_set_ext_ack:
+err_mnl_set_ack:
mnl_socket_close(nlg->nl);
err_mnl_socket_open:
free(nlg->buf);
diff --git a/include/libnetlink.h b/include/libnetlink.h
index d632219..9d9249e 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -109,6 +109,7 @@ int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
__attribute__((warn_unused_result));
int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
__attribute__((warn_unused_result));
+int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn);
int addattr(struct nlmsghdr *n, int maxlen, int type);
int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index 7ca47b2..8bb1c8d 100644
--- a/lib/libnetlink.c
+++ b/lib/libnetlink.c
@@ -65,7 +65,7 @@ static int err_attr_cb(const struct nlattr *attr, void *data)
}
/* dump netlink extended ack error message */
-static int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
+int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
{
struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {};
const struct nlmsgerr *err = mnl_nlmsg_get_payload(nlh);
@@ -120,7 +120,7 @@ static int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
#warning "libmnl required for error support"
/* No extended error ack without libmnl */
-static int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
+int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
{
return 0;
}
--
2.4.11
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