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devlink: mnlg: Add support for extended ack

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Add support for extended ack.

Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Arkadi Sharshevsky 2018-02-14 10:55:17 +02:00 committed by Stephen Hemminger
parent 844646a528
commit 049c58539f
3 changed files with 54 additions and 4 deletions
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53
devlink/mnlg.c
View File

@ -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);

1
include/libnetlink.h
View File

@ -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);

4
lib/libnetlink.c
View File

@ -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;
}